[PATCH v5 0/1] iio: jsa1212: Add JSA1212 proximity/ALS sensor

[PATCH v5 0/1] iio: jsa1212: Add JSA1212 proximity/ALS sensor

[Kuppuswamy Sathyanarayanan]

Please let me know your review comments.

PATCH v5 changes:

1. Removed irq.h and interrupt.h.
2. Disabled the device under error condition when reading data.
3. Added TODO and slave address info in file header.

PATCH v4 changes:

1. Removed unused register defines
2. Used standard endian conversion function instead of custom one.
3. Replaced register default value constants with appropriate bit value macros.
4. Removed iio user interfaces before powering off the device in remove function.

PATCH v3 changes:

1. Replaced status flags with bool values.
2. Added regmap suppport to avoid adding custom i2c register update routine.
3. Also addressed some minor comments from Jonathan Cameron

PATCH v2 changes:

1. Combined ALS/PXS enable/disable functions into a single routine.
2. Removed extra debug messages.
3. Also addressed review comments from Peter Meerwald

Kuppuswamy Sathyanarayanan (1):
  iio: jsa1212: Add JSA1212 proximity/ALS sensor

 drivers/iio/light/Kconfig   |  10 +
 drivers/iio/light/Makefile  |   1 +
 drivers/iio/light/jsa1212.c | 488 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 499 insertions(+)
 create mode 100644 drivers/iio/light/jsa1212.c

-- 
1.9.1

[PATCH v5 1/1] iio: jsa1212: Add JSA1212 proximity/ALS sensor

[Kuppuswamy Sathyanarayanan]

This patch adds a new driver for solteam opto JSA1212 proximity and
ambient light sensor.

Basic details of the chip can be found here.

http://www.solteamopto.com.tw/detail.php?ms=3&po_unit=2&pt_unit=29&p_unit=120

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 drivers/iio/light/Kconfig   |  10 +
 drivers/iio/light/Makefile  |   1 +
 drivers/iio/light/jsa1212.c | 488 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 499 insertions(+)
 create mode 100644 drivers/iio/light/jsa1212.c

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index bf05ca5..b81d8a3 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -99,6 +99,16 @@ config HID_SENSOR_PROX
 	  To compile this driver as a module, choose M here: the
 	  module will be called hid-sensor-prox.
 
+config JSA1212
+	tristate "JSA1212 ALS and proximity sensor driver"
+	depends on I2C
+	help
+	 Say Y here if you want to build a IIO driver for JSA1212
+	 proximity & ALS sensor device.
+
+	 To compile this driver as a module, choose M here:
+	 the module will be called jsa1212.
+
 config SENSORS_LM3533
 	tristate "LM3533 ambient light sensor"
 	depends on MFD_LM3533
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 8b8c09f..23c6aa9 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_GP2AP020A00F)	+= gp2ap020a00f.o
 obj-$(CONFIG_HID_SENSOR_ALS)	+= hid-sensor-als.o
 obj-$(CONFIG_HID_SENSOR_PROX)	+= hid-sensor-prox.o
 obj-$(CONFIG_ISL29125)		+= isl29125.o
+obj-$(CONFIG_JSA1212)		+= jsa1212.o
 obj-$(CONFIG_SENSORS_LM3533)	+= lm3533-als.o
 obj-$(CONFIG_LTR501)		+= ltr501.o
 obj-$(CONFIG_SENSORS_TSL2563)	+= tsl2563.o
diff --git a/drivers/iio/light/jsa1212.c b/drivers/iio/light/jsa1212.c
new file mode 100644
index 0000000..a7ee0ef
--- /dev/null
+++ b/drivers/iio/light/jsa1212.c
@@ -0,0 +1,488 @@
+/*
+ * JSA1212 Ambient Light & Proximity Sensor Driver
+ *
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
+ *
+ * TODO: Interrupt support, thresholds, range support.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/* JSA1212 reg address */
+#define JSA1212_CONF_REG		0x01
+#define JSA1212_INT_REG			0x02
+#define JSA1212_PXS_LT_REG		0x03
+#define JSA1212_PXS_HT_REG		0x04
+#define JSA1212_ALS_TH1_REG		0x05
+#define JSA1212_ALS_TH2_REG		0x06
+#define JSA1212_ALS_TH3_REG		0x07
+#define JSA1212_PXS_DATA_REG		0x08
+#define JSA1212_ALS_DT1_REG		0x09
+#define JSA1212_ALS_DT2_REG		0x0A
+#define JSA1212_ALS_RNG_REG		0x0B
+#define JSA1212_MAX_REG			0x0C
+
+/* JSA1212 reg masks */
+#define JSA1212_CONF_MASK		0xFF
+#define JSA1212_INT_MASK		0xFF
+#define JSA1212_PXS_LT_MASK		0xFF
+#define JSA1212_PXS_HT_MASK		0xFF
+#define JSA1212_ALS_TH1_MASK		0xFF
+#define JSA1212_ALS_TH2_LT_MASK		0x0F
+#define JSA1212_ALS_TH2_HT_MASK		0xF0
+#define JSA1212_ALS_TH3_MASK		0xFF
+#define JSA1212_PXS_DATA_MASK		0xFF
+#define JSA1212_ALS_DATA_MASK		0x0FFF
+#define JSA1212_ALS_DT1_MASK		0xFF
+#define JSA1212_ALS_DT2_MASK		0x0F
+#define JSA1212_ALS_RNG_MASK		0x07
+#define JSA1212_REG_MASK		0xFF
+
+/* JSA1212 CONF REG bits */
+#define JSA1212_CONF_PXS_MASK		0x80
+#define JSA1212_CONF_PXS_ENABLE		0x80
+#define JSA1212_CONF_PXS_DISABLE	0x00
+#define JSA1212_CONF_ALS_MASK		0x04
+#define JSA1212_CONF_ALS_ENABLE		0x04
+#define JSA1212_CONF_ALS_DISABLE	0x00
+#define JSA1212_CONF_IRDR_MASK		0x08
+#define JSA1212_CONF_IRDR_ENABLE	0x08
+#define JSA1212_CONF_IRDR_DISABLE	0x00
+#define JSA1212_CONF_PXS_SLP_MASK	0x70
+#define JSA1212_CONF_PXS_SLP_0MS	0x70
+#define JSA1212_CONF_PXS_SLP_12MS	0x60
+#define JSA1212_CONF_PXS_SLP_50MS	0x50
+#define JSA1212_CONF_PXS_SLP_75MS	0x40
+#define JSA1212_CONF_PXS_SLP_100MS	0x30
+#define JSA1212_CONF_PXS_SLP_200MS	0x20
+#define JSA1212_CONF_PXS_SLP_400MS	0x10
+#define JSA1212_CONF_PXS_SLP_800MS	0x00
+
+/* JSA1212 INT REG bits */
+#define JSA1212_INT_CTRL_MASK		0x01
+#define JSA1212_INT_CTRL_EITHER		0x00
+#define JSA1212_INT_CTRL_BOTH		0x01
+#define JSA1212_INT_ALS_PRST_MASK	0x06
+#define JSA1212_INT_ALS_PRST_1CONV	0x00
+#define JSA1212_INT_ALS_PRST_4CONV	0x02
+#define JSA1212_INT_ALS_PRST_8CONV	0x04
+#define JSA1212_INT_ALS_PRST_16CONV	0x06
+#define JSA1212_INT_ALS_FLAG_MASK	0x08
+#define JSA1212_INT_ALS_FLAG_CLR	0x00
+#define JSA1212_INT_PXS_PRST_MASK	0x60
+#define JSA1212_INT_PXS_PRST_1CONV	0x00
+#define JSA1212_INT_PXS_PRST_4CONV	0x20
+#define JSA1212_INT_PXS_PRST_8CONV	0x40
+#define JSA1212_INT_PXS_PRST_16CONV	0x60
+#define JSA1212_INT_PXS_FLAG_MASK	0x80
+#define JSA1212_INT_PXS_FLAG_CLR	0x00
+
+/* JSA1212 ALS RNG REG bits */
+#define JSA1212_ALS_RNG_0_2048		0x00
+#define JSA1212_ALS_RNG_0_1024		0x01
+#define JSA1212_ALS_RNG_0_512		0x02
+#define JSA1212_ALS_RNG_0_256		0x03
+#define JSA1212_ALS_RNG_0_128		0x04
+
+/* JSA1212 INT threshold range */
+#define JSA1212_ALS_TH_MIN	0x0000
+#define JSA1212_ALS_TH_MAX	0x0FFF
+#define JSA1212_PXS_TH_MIN	0x00
+#define JSA1212_PXS_TH_MAX	0xFF
+
+#define JSA1212_ALS_DELAY_MS	0xC8
+#define JSA1212_PXS_DELAY_MS	0x64
+
+#define JSA1212_DRIVER_NAME	"jsa1212"
+#define JSA1212_REGMAP_NAME	"jsa1212_regmap"
+
+enum jsa1212_op_mode {
+	JSA1212_OPMODE_ALS_EN,
+	JSA1212_OPMODE_PXS_EN,
+};
+
+struct jsa1212_data {
+	struct i2c_client *client;
+	struct mutex lock;
+	u8 als_rng_idx;
+	bool als_en; /* ALS enable status */
+	bool pxs_en; /* proximity enable status */
+	struct regmap *regmap;
+};
+
+/* ALS range idx to val mapping */
+static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
+						128, 128, 128};
+
+/* Enables or disables ALS function based on status */
+static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
+{
+	int ret;
+
+	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
+				JSA1212_CONF_ALS_MASK,
+				status);
+	if (ret < 0)
+		return ret;
+
+	data->als_en = status ? true : false;
+
+	return ret;
+}
+
+/* Enables or disables PXS function based on status */
+static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
+{
+	int ret;
+
+	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
+				JSA1212_CONF_PXS_MASK,
+				status);
+	if (ret < 0)
+		return ret;
+
+	data->pxs_en = status ? true : false;
+
+	return ret;
+}
+
+static int jsa1212_read_als_data(struct jsa1212_data *data,
+				unsigned int *val)
+{
+	int ret;
+	u8 als_data[2];
+
+	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
+	if (ret < 0)
+		return ret;
+
+	/* Delay for data output */
+	msleep(JSA1212_ALS_DELAY_MS);
+
+	/* Read 12 bit data */
+	ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, als_data, 2);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "als data read err\n");
+		goto als_data_read_err;
+	}
+
+	*val = le16_to_cpup((__le16 *)als_data);
+
+als_data_read_err:
+	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int jsa1212_read_pxs_data(struct jsa1212_data *data,
+				unsigned int *val)
+{
+	int ret;
+	unsigned int pxs_data;
+
+	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
+	if (ret < 0)
+		return ret;
+
+	/* Delay for data output */
+	msleep(JSA1212_PXS_DELAY_MS);
+
+	/* Read out all data */
+	ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "pxs data read err\n");
+		goto pxs_data_read_err;
+	}
+
+	*val = pxs_data & JSA1212_PXS_DATA_MASK;
+
+pxs_data_read_err:
+	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int jsa1212_read_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *chan,
+				int *val, int *val2, long mask)
+{
+	int ret;
+	struct jsa1212_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&data->lock);
+		switch (chan->type) {
+		case IIO_LIGHT:
+			ret = jsa1212_read_als_data(data, val);
+			break;
+		case IIO_PROXIMITY:
+			ret = jsa1212_read_pxs_data(data, val);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		ret = ret < 0 ? ret : IIO_VAL_INT;
+		mutex_unlock(&data->lock);
+		break;
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_LIGHT:
+			*val = jsa1212_als_range_val[data->als_rng_idx];
+			*val2 = BIT(12); /* Max 12 bit value */
+			ret = IIO_VAL_FRACTIONAL;
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static const struct iio_chan_spec jsa1212_channels[] = {
+	{
+		.type = IIO_LIGHT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE),
+	},
+	{
+		.type = IIO_PROXIMITY,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+	}
+};
+
+static const struct iio_info jsa1212_info = {
+	.driver_module		= THIS_MODULE,
+	.read_raw		= &jsa1212_read_raw,
+};
+
+static int jsa1212_chip_init(struct jsa1212_data *data)
+{
+	int ret;
+
+	ret = regmap_write(data->regmap, JSA1212_CONF_REG,
+				(JSA1212_CONF_PXS_SLP_50MS |
+				JSA1212_CONF_IRDR_ENABLE));
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(data->regmap, JSA1212_INT_REG,
+				JSA1212_INT_ALS_PRST_4CONV);
+	if (ret < 0)
+		return ret;
+
+	data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
+
+	return 0;
+}
+
+static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case JSA1212_PXS_DATA_REG:
+	case JSA1212_ALS_DT1_REG:
+	case JSA1212_ALS_DT2_REG:
+	case JSA1212_INT_REG:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static struct regmap_config jsa1212_regmap_config = {
+	.name =  JSA1212_REGMAP_NAME,
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = JSA1212_MAX_REG,
+	.cache_type = REGCACHE_RBTREE,
+	.volatile_reg = jsa1212_is_volatile_reg,
+};
+
+static int jsa1212_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	struct jsa1212_data *jsa1212_data;
+	struct iio_dev *indio_dev;
+	struct regmap *regmap;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*jsa1212_data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "Regmap initialization failed.\n");
+		return PTR_ERR(regmap);
+	}
+
+	jsa1212_data = iio_priv(indio_dev);
+
+	i2c_set_clientdata(client, indio_dev);
+	jsa1212_data->client = client;
+	jsa1212_data->regmap = regmap;
+
+	mutex_init(&jsa1212_data->lock);
+
+	ret = jsa1212_chip_init(jsa1212_data);
+	if (ret < 0)
+		return ret;
+
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->channels = jsa1212_channels;
+	indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
+	indio_dev->name = JSA1212_DRIVER_NAME;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	indio_dev->info = &jsa1212_info;
+
+	ret = iio_device_register(indio_dev);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s: register device failed\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+ /* power off the device */
+static int jsa1212_power_off(struct jsa1212_data *data)
+{
+	int ret;
+
+	mutex_lock(&data->lock);
+
+	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
+				JSA1212_CONF_ALS_MASK |
+				JSA1212_CONF_PXS_MASK,
+				JSA1212_CONF_ALS_DISABLE |
+				JSA1212_CONF_PXS_DISABLE);
+
+	if (ret < 0)
+		dev_err(&data->client->dev, "power off cmd failed\n");
+
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+
+static int jsa1212_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct jsa1212_data *data = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+
+	return jsa1212_power_off(data);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int jsa1212_suspend(struct device *dev)
+{
+	struct jsa1212_data *data;
+
+	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
+
+	return jsa1212_power_off(data);
+}
+
+static int jsa1212_resume(struct device *dev)
+{
+	int ret = 0;
+	struct jsa1212_data *data;
+
+	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
+
+	mutex_lock(&data->lock);
+
+	if (data->als_en) {
+		ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
+		if (ret < 0) {
+			dev_err(dev, "als resume failed\n");
+			goto unlock_and_ret;
+		}
+	}
+
+	if (data->pxs_en) {
+		ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
+		if (ret < 0)
+			dev_err(dev, "pxs resume failed\n");
+	}
+
+unlock_and_ret:
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
+
+#define JSA1212_PM_OPS (&jsa1212_pm_ops)
+#else
+#define JSA1212_PM_OPS NULL
+#endif
+
+static const struct acpi_device_id jsa1212_acpi_match[] = {
+	{"JSA1212", 0},
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
+
+static const struct i2c_device_id jsa1212_id[] = {
+	{ JSA1212_DRIVER_NAME, 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, jsa1212_id);
+
+static struct i2c_driver jsa1212_driver = {
+	.driver = {
+		.name	= JSA1212_DRIVER_NAME,
+		.pm	= JSA1212_PM_OPS,
+		.owner	= THIS_MODULE,
+		.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
+	},
+	.probe		= jsa1212_probe,
+	.remove		= jsa1212_remove,
+	.id_table	= jsa1212_id,
+};
+module_i2c_driver(jsa1212_driver);
+
+MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
+MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

Re: [PATCH v5 1/1] iio: jsa1212: Add JSA1212 proximity/ALS sensor

[Peter Meerwald]

> This patch adds a new driver for solteam opto JSA1212 proximity and
> ambient light sensor.

minor nitpicking below

> 
> Basic details of the chip can be found here.
> 
> http://www.solteamopto.com.tw/detail.php?ms=3&po_unit=2&pt_unit=29&p_unit=120
> 
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> ---
>  drivers/iio/light/Kconfig   |  10 +
>  drivers/iio/light/Makefile  |   1 +
>  drivers/iio/light/jsa1212.c | 488 ++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 499 insertions(+)
>  create mode 100644 drivers/iio/light/jsa1212.c
> 
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index bf05ca5..b81d8a3 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -99,6 +99,16 @@ config HID_SENSOR_PROX
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called hid-sensor-prox.
>  
> +config JSA1212
> +	tristate "JSA1212 ALS and proximity sensor driver"
> +	depends on I2C
> +	help
> +	 Say Y here if you want to build a IIO driver for JSA1212
> +	 proximity & ALS sensor device.
> +
> +	 To compile this driver as a module, choose M here:
> +	 the module will be called jsa1212.
> +
>  config SENSORS_LM3533
>  	tristate "LM3533 ambient light sensor"
>  	depends on MFD_LM3533
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index 8b8c09f..23c6aa9 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_GP2AP020A00F)	+= gp2ap020a00f.o
>  obj-$(CONFIG_HID_SENSOR_ALS)	+= hid-sensor-als.o
>  obj-$(CONFIG_HID_SENSOR_PROX)	+= hid-sensor-prox.o
>  obj-$(CONFIG_ISL29125)		+= isl29125.o
> +obj-$(CONFIG_JSA1212)		+= jsa1212.o
>  obj-$(CONFIG_SENSORS_LM3533)	+= lm3533-als.o
>  obj-$(CONFIG_LTR501)		+= ltr501.o
>  obj-$(CONFIG_SENSORS_TSL2563)	+= tsl2563.o
> diff --git a/drivers/iio/light/jsa1212.c b/drivers/iio/light/jsa1212.c
> new file mode 100644
> index 0000000..a7ee0ef
> --- /dev/null
> +++ b/drivers/iio/light/jsa1212.c
> @@ -0,0 +1,488 @@
> +/*
> + * JSA1212 Ambient Light & Proximity Sensor Driver
> + *
> + * Copyright (c) 2014, Intel Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
> + *
> + * TODO: Interrupt support, thresholds, range support.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>

I don't think moduleparam is needed

> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/mutex.h>
> +#include <linux/slab.h>

slab is included twice (see above)

> +#include <linux/acpi.h>
> +#include <linux/regmap.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +
> +/* JSA1212 reg address */
> +#define JSA1212_CONF_REG		0x01
> +#define JSA1212_INT_REG			0x02
> +#define JSA1212_PXS_LT_REG		0x03
> +#define JSA1212_PXS_HT_REG		0x04
> +#define JSA1212_ALS_TH1_REG		0x05
> +#define JSA1212_ALS_TH2_REG		0x06
> +#define JSA1212_ALS_TH3_REG		0x07
> +#define JSA1212_PXS_DATA_REG		0x08
> +#define JSA1212_ALS_DT1_REG		0x09
> +#define JSA1212_ALS_DT2_REG		0x0A
> +#define JSA1212_ALS_RNG_REG		0x0B
> +#define JSA1212_MAX_REG			0x0C
> +
> +/* JSA1212 reg masks */
> +#define JSA1212_CONF_MASK		0xFF
> +#define JSA1212_INT_MASK		0xFF
> +#define JSA1212_PXS_LT_MASK		0xFF
> +#define JSA1212_PXS_HT_MASK		0xFF
> +#define JSA1212_ALS_TH1_MASK		0xFF
> +#define JSA1212_ALS_TH2_LT_MASK		0x0F
> +#define JSA1212_ALS_TH2_HT_MASK		0xF0
> +#define JSA1212_ALS_TH3_MASK		0xFF
> +#define JSA1212_PXS_DATA_MASK		0xFF
> +#define JSA1212_ALS_DATA_MASK		0x0FFF
> +#define JSA1212_ALS_DT1_MASK		0xFF
> +#define JSA1212_ALS_DT2_MASK		0x0F
> +#define JSA1212_ALS_RNG_MASK		0x07
> +#define JSA1212_REG_MASK		0xFF

REG_MASK is not used -- what would it be for?

> +
> +/* JSA1212 CONF REG bits */
> +#define JSA1212_CONF_PXS_MASK		0x80
> +#define JSA1212_CONF_PXS_ENABLE		0x80
> +#define JSA1212_CONF_PXS_DISABLE	0x00
> +#define JSA1212_CONF_ALS_MASK		0x04
> +#define JSA1212_CONF_ALS_ENABLE		0x04
> +#define JSA1212_CONF_ALS_DISABLE	0x00
> +#define JSA1212_CONF_IRDR_MASK		0x08
> +#define JSA1212_CONF_IRDR_ENABLE	0x08
> +#define JSA1212_CONF_IRDR_DISABLE	0x00
> +#define JSA1212_CONF_PXS_SLP_MASK	0x70
> +#define JSA1212_CONF_PXS_SLP_0MS	0x70
> +#define JSA1212_CONF_PXS_SLP_12MS	0x60
> +#define JSA1212_CONF_PXS_SLP_50MS	0x50
> +#define JSA1212_CONF_PXS_SLP_75MS	0x40
> +#define JSA1212_CONF_PXS_SLP_100MS	0x30
> +#define JSA1212_CONF_PXS_SLP_200MS	0x20
> +#define JSA1212_CONF_PXS_SLP_400MS	0x10
> +#define JSA1212_CONF_PXS_SLP_800MS	0x00
> +
> +/* JSA1212 INT REG bits */
> +#define JSA1212_INT_CTRL_MASK		0x01
> +#define JSA1212_INT_CTRL_EITHER		0x00
> +#define JSA1212_INT_CTRL_BOTH		0x01
> +#define JSA1212_INT_ALS_PRST_MASK	0x06
> +#define JSA1212_INT_ALS_PRST_1CONV	0x00
> +#define JSA1212_INT_ALS_PRST_4CONV	0x02
> +#define JSA1212_INT_ALS_PRST_8CONV	0x04
> +#define JSA1212_INT_ALS_PRST_16CONV	0x06
> +#define JSA1212_INT_ALS_FLAG_MASK	0x08
> +#define JSA1212_INT_ALS_FLAG_CLR	0x00
> +#define JSA1212_INT_PXS_PRST_MASK	0x60
> +#define JSA1212_INT_PXS_PRST_1CONV	0x00
> +#define JSA1212_INT_PXS_PRST_4CONV	0x20
> +#define JSA1212_INT_PXS_PRST_8CONV	0x40
> +#define JSA1212_INT_PXS_PRST_16CONV	0x60
> +#define JSA1212_INT_PXS_FLAG_MASK	0x80
> +#define JSA1212_INT_PXS_FLAG_CLR	0x00
> +
> +/* JSA1212 ALS RNG REG bits */
> +#define JSA1212_ALS_RNG_0_2048		0x00
> +#define JSA1212_ALS_RNG_0_1024		0x01
> +#define JSA1212_ALS_RNG_0_512		0x02
> +#define JSA1212_ALS_RNG_0_256		0x03
> +#define JSA1212_ALS_RNG_0_128		0x04
> +
> +/* JSA1212 INT threshold range */
> +#define JSA1212_ALS_TH_MIN	0x0000
> +#define JSA1212_ALS_TH_MAX	0x0FFF
> +#define JSA1212_PXS_TH_MIN	0x00
> +#define JSA1212_PXS_TH_MAX	0xFF
> +
> +#define JSA1212_ALS_DELAY_MS	0xC8
> +#define JSA1212_PXS_DELAY_MS	0x64
> +
> +#define JSA1212_DRIVER_NAME	"jsa1212"
> +#define JSA1212_REGMAP_NAME	"jsa1212_regmap"
> +
> +enum jsa1212_op_mode {
> +	JSA1212_OPMODE_ALS_EN,
> +	JSA1212_OPMODE_PXS_EN,
> +};
> +
> +struct jsa1212_data {
> +	struct i2c_client *client;
> +	struct mutex lock;
> +	u8 als_rng_idx;
> +	bool als_en; /* ALS enable status */
> +	bool pxs_en; /* proximity enable status */
> +	struct regmap *regmap;
> +};
> +
> +/* ALS range idx to val mapping */
> +static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
> +						128, 128, 128};
> +
> +/* Enables or disables ALS function based on status */
> +static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
> +{
> +	int ret;
> +
> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
> +				JSA1212_CONF_ALS_MASK,
> +				status);
> +	if (ret < 0)
> +		return ret;
> +
> +	data->als_en = status ? true : false;
> +
> +	return ret;
> +}
> +
> +/* Enables or disables PXS function based on status */
> +static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
> +{
> +	int ret;
> +
> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
> +				JSA1212_CONF_PXS_MASK,
> +				status);
> +	if (ret < 0)
> +		return ret;
> +
> +	data->pxs_en = status ? true : false;
> +
> +	return ret;
> +}
> +
> +static int jsa1212_read_als_data(struct jsa1212_data *data,
> +				unsigned int *val)
> +{
> +	int ret;
> +	u8 als_data[2];

__le16 als_data;

should make the conversion below simpler: *val = le16_to_cpu(als_data);

> +
> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Delay for data output */
> +	msleep(JSA1212_ALS_DELAY_MS);
> +
> +	/* Read 12 bit data */
> +	ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, als_data, 2);
> +	if (ret < 0) {
> +		dev_err(&data->client->dev, "als data read err\n");
> +		goto als_data_read_err;
> +	}
> +
> +	*val = le16_to_cpup((__le16 *)als_data);
> +
> +als_data_read_err:
> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);

simply 
return jsa1212_als_enable(..)

drop lines below

> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int jsa1212_read_pxs_data(struct jsa1212_data *data,
> +				unsigned int *val)
> +{
> +	int ret;
> +	unsigned int pxs_data;
> +
> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Delay for data output */
> +	msleep(JSA1212_PXS_DELAY_MS);
> +
> +	/* Read out all data */
> +	ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
> +	if (ret < 0) {
> +		dev_err(&data->client->dev, "pxs data read err\n");
> +		goto pxs_data_read_err;
> +	}
> +
> +	*val = pxs_data & JSA1212_PXS_DATA_MASK;
> +
> +pxs_data_read_err:

simply 
return jsa1212_als_enable(..)

drop lines below

> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int jsa1212_read_raw(struct iio_dev *indio_dev,
> +				struct iio_chan_spec const *chan,
> +				int *val, int *val2, long mask)
> +{
> +	int ret;
> +	struct jsa1212_data *data = iio_priv(indio_dev);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		mutex_lock(&data->lock);
> +		switch (chan->type) {
> +		case IIO_LIGHT:
> +			ret = jsa1212_read_als_data(data, val);
> +			break;
> +		case IIO_PROXIMITY:
> +			ret = jsa1212_read_pxs_data(data, val);
> +			break;
> +		default:
> +			ret = -EINVAL;
> +			break;
> +		}
> +		ret = ret < 0 ? ret : IIO_VAL_INT;
> +		mutex_unlock(&data->lock);

could move mutex_unlock() one line up

> +		break;
> +	case IIO_CHAN_INFO_SCALE:
> +		switch (chan->type) {
> +		case IIO_LIGHT:
> +			*val = jsa1212_als_range_val[data->als_rng_idx];
> +			*val2 = BIT(12); /* Max 12 bit value */
> +			ret = IIO_VAL_FRACTIONAL;
> +			break;
> +		default:
> +			ret = -EINVAL;
> +			break;
> +		}
> +		break;
> +	default:
> +		ret = -EINVAL;
> +		break;
> +	}
> +
> +	return ret;
> +}
> +
> +static const struct iio_chan_spec jsa1212_channels[] = {
> +	{
> +		.type = IIO_LIGHT,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +			BIT(IIO_CHAN_INFO_SCALE),
> +	},
> +	{
> +		.type = IIO_PROXIMITY,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +	}
> +};
> +
> +static const struct iio_info jsa1212_info = {
> +	.driver_module		= THIS_MODULE,
> +	.read_raw		= &jsa1212_read_raw,
> +};
> +
> +static int jsa1212_chip_init(struct jsa1212_data *data)
> +{
> +	int ret;
> +
> +	ret = regmap_write(data->regmap, JSA1212_CONF_REG,
> +				(JSA1212_CONF_PXS_SLP_50MS |
> +				JSA1212_CONF_IRDR_ENABLE));
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = regmap_write(data->regmap, JSA1212_INT_REG,
> +				JSA1212_INT_ALS_PRST_4CONV);
> +	if (ret < 0)
> +		return ret;
> +
> +	data->als_rng_idx = JSA1212_ALS_RNG_0_2048;

should the range setting be written to the chip?

> +
> +	return 0;
> +}
> +
> +static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case JSA1212_PXS_DATA_REG:
> +	case JSA1212_ALS_DT1_REG:
> +	case JSA1212_ALS_DT2_REG:
> +	case JSA1212_INT_REG:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +static struct regmap_config jsa1212_regmap_config = {
> +	.name =  JSA1212_REGMAP_NAME,
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = JSA1212_MAX_REG,
> +	.cache_type = REGCACHE_RBTREE,
> +	.volatile_reg = jsa1212_is_volatile_reg,
> +};
> +
> +static int jsa1212_probe(struct i2c_client *client,
> +			     const struct i2c_device_id *id)
> +{
> +	struct jsa1212_data *jsa1212_data;
> +	struct iio_dev *indio_dev;
> +	struct regmap *regmap;
> +	int ret;
> +
> +	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
> +		return -ENODEV;
> +
> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*jsa1212_data));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(&client->dev, "Regmap initialization failed.\n");
> +		return PTR_ERR(regmap);
> +	}
> +
> +	jsa1212_data = iio_priv(indio_dev);
> +
> +	i2c_set_clientdata(client, indio_dev);
> +	jsa1212_data->client = client;
> +	jsa1212_data->regmap = regmap;
> +
> +	mutex_init(&jsa1212_data->lock);
> +
> +	ret = jsa1212_chip_init(jsa1212_data);
> +	if (ret < 0)
> +		return ret;
> +
> +	indio_dev->dev.parent = &client->dev;
> +	indio_dev->channels = jsa1212_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
> +	indio_dev->name = JSA1212_DRIVER_NAME;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +
> +	indio_dev->info = &jsa1212_info;
> +
> +	ret = iio_device_register(indio_dev);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "%s: register device failed\n", __func__);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> + /* power off the device */
> +static int jsa1212_power_off(struct jsa1212_data *data)
> +{
> +	int ret;
> +
> +	mutex_lock(&data->lock);
> +
> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
> +				JSA1212_CONF_ALS_MASK |
> +				JSA1212_CONF_PXS_MASK,
> +				JSA1212_CONF_ALS_DISABLE |
> +				JSA1212_CONF_PXS_DISABLE);
> +
> +	if (ret < 0)
> +		dev_err(&data->client->dev, "power off cmd failed\n");
> +
> +	mutex_unlock(&data->lock);
> +
> +	return ret;
> +}
> +

drop extra newline

> +
> +static int jsa1212_remove(struct i2c_client *client)
> +{
> +	struct iio_dev *indio_dev = i2c_get_clientdata(client);
> +	struct jsa1212_data *data = iio_priv(indio_dev);
> +
> +	iio_device_unregister(indio_dev);
> +
> +	return jsa1212_power_off(data);
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int jsa1212_suspend(struct device *dev)
> +{
> +	struct jsa1212_data *data;
> +
> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
> +
> +	return jsa1212_power_off(data);
> +}
> +
> +static int jsa1212_resume(struct device *dev)
> +{
> +	int ret = 0;
> +	struct jsa1212_data *data;
> +
> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
> +
> +	mutex_lock(&data->lock);
> +
> +	if (data->als_en) {
> +		ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
> +		if (ret < 0) {
> +			dev_err(dev, "als resume failed\n");
> +			goto unlock_and_ret;
> +		}
> +	}
> +
> +	if (data->pxs_en) {
> +		ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
> +		if (ret < 0)
> +			dev_err(dev, "pxs resume failed\n");
> +	}
> +
> +unlock_and_ret:
> +	mutex_unlock(&data->lock);
> +	return ret;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
> +
> +#define JSA1212_PM_OPS (&jsa1212_pm_ops)
> +#else
> +#define JSA1212_PM_OPS NULL
> +#endif
> +
> +static const struct acpi_device_id jsa1212_acpi_match[] = {
> +	{"JSA1212", 0},
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
> +
> +static const struct i2c_device_id jsa1212_id[] = {
> +	{ JSA1212_DRIVER_NAME, 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, jsa1212_id);
> +
> +static struct i2c_driver jsa1212_driver = {
> +	.driver = {
> +		.name	= JSA1212_DRIVER_NAME,
> +		.pm	= JSA1212_PM_OPS,
> +		.owner	= THIS_MODULE,
> +		.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
> +	},
> +	.probe		= jsa1212_probe,
> +	.remove		= jsa1212_remove,
> +	.id_table	= jsa1212_id,
> +};
> +module_i2c_driver(jsa1212_driver);
> +
> +MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
> +MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
> +MODULE_LICENSE("GPL v2");
> 

-- 

Peter Meerwald
+43-664-2444418 (mobile)

Re: [PATCH v5 1/1] iio: jsa1212: Add JSA1212 proximity/ALS sensor

[Hartmut Knaack]

Peter Meerwald schrieb, Am 12.09.2014 15:05:
>> This patch adds a new driver for solteam opto JSA1212 proximity and
>> ambient light sensor.
> 
> minor nitpicking below
Some comments from me as well.
> 
>>
>> Basic details of the chip can be found here.
>>
>> http://www.solteamopto.com.tw/detail.php?ms=3&po_unit=2&pt_unit=29&p_unit=120
>>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
>> ---
>>  drivers/iio/light/Kconfig   |  10 +
>>  drivers/iio/light/Makefile  |   1 +
>>  drivers/iio/light/jsa1212.c | 488 ++++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 499 insertions(+)
>>  create mode 100644 drivers/iio/light/jsa1212.c
>>
>> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
>> index bf05ca5..b81d8a3 100644
>> --- a/drivers/iio/light/Kconfig
>> +++ b/drivers/iio/light/Kconfig
>> @@ -99,6 +99,16 @@ config HID_SENSOR_PROX
>>  	  To compile this driver as a module, choose M here: the
>>  	  module will be called hid-sensor-prox.
>>  
>> +config JSA1212
>> +	tristate "JSA1212 ALS and proximity sensor driver"
>> +	depends on I2C
>> +	help
>> +	 Say Y here if you want to build a IIO driver for JSA1212
>> +	 proximity & ALS sensor device.
>> +
>> +	 To compile this driver as a module, choose M here:
>> +	 the module will be called jsa1212.
>> +
>>  config SENSORS_LM3533
>>  	tristate "LM3533 ambient light sensor"
>>  	depends on MFD_LM3533
>> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
>> index 8b8c09f..23c6aa9 100644
>> --- a/drivers/iio/light/Makefile
>> +++ b/drivers/iio/light/Makefile
>> @@ -11,6 +11,7 @@ obj-$(CONFIG_GP2AP020A00F)	+= gp2ap020a00f.o
>>  obj-$(CONFIG_HID_SENSOR_ALS)	+= hid-sensor-als.o
>>  obj-$(CONFIG_HID_SENSOR_PROX)	+= hid-sensor-prox.o
>>  obj-$(CONFIG_ISL29125)		+= isl29125.o
>> +obj-$(CONFIG_JSA1212)		+= jsa1212.o
>>  obj-$(CONFIG_SENSORS_LM3533)	+= lm3533-als.o
>>  obj-$(CONFIG_LTR501)		+= ltr501.o
>>  obj-$(CONFIG_SENSORS_TSL2563)	+= tsl2563.o
>> diff --git a/drivers/iio/light/jsa1212.c b/drivers/iio/light/jsa1212.c
>> new file mode 100644
>> index 0000000..a7ee0ef
>> --- /dev/null
>> +++ b/drivers/iio/light/jsa1212.c
>> @@ -0,0 +1,488 @@
>> +/*
>> + * JSA1212 Ambient Light & Proximity Sensor Driver
>> + *
>> + * Copyright (c) 2014, Intel Corporation.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms and conditions of the GNU General Public License,
>> + * version 2, as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope it will be useful, but WITHOUT
>> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
>> + * more details.
>> + *
>> + * JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
>> + *
>> + * TODO: Interrupt support, thresholds, range support.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/moduleparam.h>
> 
> I don't think moduleparam is needed
> 
>> +#include <linux/delay.h>
>> +#include <linux/i2c.h>
>> +#include <linux/mutex.h>
>> +#include <linux/slab.h>
> 
> slab is included twice (see above)
> 
>> +#include <linux/acpi.h>
>> +#include <linux/regmap.h>
>> +#include <linux/iio/iio.h>
>> +#include <linux/iio/sysfs.h>
>> +
>> +/* JSA1212 reg address */
>> +#define JSA1212_CONF_REG		0x01
>> +#define JSA1212_INT_REG			0x02
>> +#define JSA1212_PXS_LT_REG		0x03
>> +#define JSA1212_PXS_HT_REG		0x04
>> +#define JSA1212_ALS_TH1_REG		0x05
>> +#define JSA1212_ALS_TH2_REG		0x06
>> +#define JSA1212_ALS_TH3_REG		0x07
>> +#define JSA1212_PXS_DATA_REG		0x08
>> +#define JSA1212_ALS_DT1_REG		0x09
>> +#define JSA1212_ALS_DT2_REG		0x0A
>> +#define JSA1212_ALS_RNG_REG		0x0B
>> +#define JSA1212_MAX_REG			0x0C
>> +
>> +/* JSA1212 reg masks */
>> +#define JSA1212_CONF_MASK		0xFF
>> +#define JSA1212_INT_MASK		0xFF
>> +#define JSA1212_PXS_LT_MASK		0xFF
>> +#define JSA1212_PXS_HT_MASK		0xFF
>> +#define JSA1212_ALS_TH1_MASK		0xFF
>> +#define JSA1212_ALS_TH2_LT_MASK		0x0F
>> +#define JSA1212_ALS_TH2_HT_MASK		0xF0
>> +#define JSA1212_ALS_TH3_MASK		0xFF
>> +#define JSA1212_PXS_DATA_MASK		0xFF
>> +#define JSA1212_ALS_DATA_MASK		0x0FFF
>> +#define JSA1212_ALS_DT1_MASK		0xFF
>> +#define JSA1212_ALS_DT2_MASK		0x0F
>> +#define JSA1212_ALS_RNG_MASK		0x07
>> +#define JSA1212_REG_MASK		0xFF
> 
> REG_MASK is not used -- what would it be for?
> 
>> +
>> +/* JSA1212 CONF REG bits */
>> +#define JSA1212_CONF_PXS_MASK		0x80
>> +#define JSA1212_CONF_PXS_ENABLE		0x80
>> +#define JSA1212_CONF_PXS_DISABLE	0x00
>> +#define JSA1212_CONF_ALS_MASK		0x04
>> +#define JSA1212_CONF_ALS_ENABLE		0x04
>> +#define JSA1212_CONF_ALS_DISABLE	0x00
>> +#define JSA1212_CONF_IRDR_MASK		0x08
>> +#define JSA1212_CONF_IRDR_ENABLE	0x08
>> +#define JSA1212_CONF_IRDR_DISABLE	0x00
>> +#define JSA1212_CONF_PXS_SLP_MASK	0x70
>> +#define JSA1212_CONF_PXS_SLP_0MS	0x70
>> +#define JSA1212_CONF_PXS_SLP_12MS	0x60
>> +#define JSA1212_CONF_PXS_SLP_50MS	0x50
>> +#define JSA1212_CONF_PXS_SLP_75MS	0x40
>> +#define JSA1212_CONF_PXS_SLP_100MS	0x30
>> +#define JSA1212_CONF_PXS_SLP_200MS	0x20
>> +#define JSA1212_CONF_PXS_SLP_400MS	0x10
>> +#define JSA1212_CONF_PXS_SLP_800MS	0x00
>> +
>> +/* JSA1212 INT REG bits */
>> +#define JSA1212_INT_CTRL_MASK		0x01
>> +#define JSA1212_INT_CTRL_EITHER		0x00
>> +#define JSA1212_INT_CTRL_BOTH		0x01
>> +#define JSA1212_INT_ALS_PRST_MASK	0x06
>> +#define JSA1212_INT_ALS_PRST_1CONV	0x00
>> +#define JSA1212_INT_ALS_PRST_4CONV	0x02
>> +#define JSA1212_INT_ALS_PRST_8CONV	0x04
>> +#define JSA1212_INT_ALS_PRST_16CONV	0x06
>> +#define JSA1212_INT_ALS_FLAG_MASK	0x08
>> +#define JSA1212_INT_ALS_FLAG_CLR	0x00
>> +#define JSA1212_INT_PXS_PRST_MASK	0x60
>> +#define JSA1212_INT_PXS_PRST_1CONV	0x00
>> +#define JSA1212_INT_PXS_PRST_4CONV	0x20
>> +#define JSA1212_INT_PXS_PRST_8CONV	0x40
>> +#define JSA1212_INT_PXS_PRST_16CONV	0x60
>> +#define JSA1212_INT_PXS_FLAG_MASK	0x80
>> +#define JSA1212_INT_PXS_FLAG_CLR	0x00
>> +
>> +/* JSA1212 ALS RNG REG bits */
>> +#define JSA1212_ALS_RNG_0_2048		0x00
>> +#define JSA1212_ALS_RNG_0_1024		0x01
>> +#define JSA1212_ALS_RNG_0_512		0x02
>> +#define JSA1212_ALS_RNG_0_256		0x03
>> +#define JSA1212_ALS_RNG_0_128		0x04
>> +
>> +/* JSA1212 INT threshold range */
>> +#define JSA1212_ALS_TH_MIN	0x0000
>> +#define JSA1212_ALS_TH_MAX	0x0FFF
>> +#define JSA1212_PXS_TH_MIN	0x00
>> +#define JSA1212_PXS_TH_MAX	0xFF
>> +
>> +#define JSA1212_ALS_DELAY_MS	0xC8
>> +#define JSA1212_PXS_DELAY_MS	0x64
Shouldn't these delays be in human-readable format? Like 200 and 100?
>> +
>> +#define JSA1212_DRIVER_NAME	"jsa1212"
>> +#define JSA1212_REGMAP_NAME	"jsa1212_regmap"
>> +
>> +enum jsa1212_op_mode {
>> +	JSA1212_OPMODE_ALS_EN,
>> +	JSA1212_OPMODE_PXS_EN,
>> +};
>> +
>> +struct jsa1212_data {
>> +	struct i2c_client *client;
>> +	struct mutex lock;
>> +	u8 als_rng_idx;
>> +	bool als_en; /* ALS enable status */
>> +	bool pxs_en; /* proximity enable status */
>> +	struct regmap *regmap;
>> +};
>> +
>> +/* ALS range idx to val mapping */
>> +static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
>> +						128, 128, 128};
>> +
>> +/* Enables or disables ALS function based on status */
>> +static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
>> +{
>> +	int ret;
>> +
>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>> +				JSA1212_CONF_ALS_MASK,
>> +				status);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	data->als_en = status ? true : false;
data->als_en = !!status;
>> +
>> +	return ret;
Just return 0; to indicate successful termination.
>> +}
>> +
>> +/* Enables or disables PXS function based on status */
>> +static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
>> +{
>> +	int ret;
>> +
>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>> +				JSA1212_CONF_PXS_MASK,
>> +				status);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	data->pxs_en = status ? true : false;
>> +
>> +	return ret;
Same applies here.
>> +}
>> +
>> +static int jsa1212_read_als_data(struct jsa1212_data *data,
>> +				unsigned int *val)
>> +{
>> +	int ret;
>> +	u8 als_data[2];
> 
> __le16 als_data;
> 
> should make the conversion below simpler: *val = le16_to_cpu(als_data);
> 
>> +
>> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	/* Delay for data output */
>> +	msleep(JSA1212_ALS_DELAY_MS);
>> +
>> +	/* Read 12 bit data */
>> +	ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, als_data, 2);
>> +	if (ret < 0) {
>> +		dev_err(&data->client->dev, "als data read err\n");
>> +		goto als_data_read_err;
>> +	}
>> +
>> +	*val = le16_to_cpup((__le16 *)als_data);
>> +
>> +als_data_read_err:
>> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
> 
> simply 
> return jsa1212_als_enable(..)
> 
> drop lines below
> 
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return 0;
>> +}
>> +
>> +static int jsa1212_read_pxs_data(struct jsa1212_data *data,
>> +				unsigned int *val)
>> +{
>> +	int ret;
>> +	unsigned int pxs_data;
>> +
>> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	/* Delay for data output */
>> +	msleep(JSA1212_PXS_DELAY_MS);
>> +
>> +	/* Read out all data */
>> +	ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
>> +	if (ret < 0) {
>> +		dev_err(&data->client->dev, "pxs data read err\n");
>> +		goto pxs_data_read_err;
>> +	}
>> +
>> +	*val = pxs_data & JSA1212_PXS_DATA_MASK;
>> +
>> +pxs_data_read_err:
> 
> simply 
> return jsa1212_als_enable(..)
> 
> drop lines below
> 
>> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return 0;
>> +}
>> +
>> +static int jsa1212_read_raw(struct iio_dev *indio_dev,
>> +				struct iio_chan_spec const *chan,
>> +				int *val, int *val2, long mask)
>> +{
>> +	int ret;
>> +	struct jsa1212_data *data = iio_priv(indio_dev);
>> +
>> +	switch (mask) {
>> +	case IIO_CHAN_INFO_RAW:
>> +		mutex_lock(&data->lock);
>> +		switch (chan->type) {
>> +		case IIO_LIGHT:
>> +			ret = jsa1212_read_als_data(data, val);
>> +			break;
>> +		case IIO_PROXIMITY:
>> +			ret = jsa1212_read_pxs_data(data, val);
>> +			break;
>> +		default:
>> +			ret = -EINVAL;
>> +			break;
>> +		}
>> +		ret = ret < 0 ? ret : IIO_VAL_INT;
>> +		mutex_unlock(&data->lock);
> 
> could move mutex_unlock() one line up
And return ret or IIO_VAL_INT directly here, making the break below obsolete.
> 
>> +		break;
>> +	case IIO_CHAN_INFO_SCALE:
>> +		switch (chan->type) {
>> +		case IIO_LIGHT:
>> +			*val = jsa1212_als_range_val[data->als_rng_idx];
>> +			*val2 = BIT(12); /* Max 12 bit value */
>> +			ret = IIO_VAL_FRACTIONAL;
Better: define JSA1212_ALS_RESOLUTION and use it here for *val2. Then just return IIO_VAL_FRACTIONAL_LOG2.
You can also drop the following lines or keep the default sections empty and just return -EINVAL at the end.
>> +			break;
>> +		default:
>> +			ret = -EINVAL;
>> +			break;
>> +		}
>> +		break;
>> +	default:
>> +		ret = -EINVAL;
>> +		break;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static const struct iio_chan_spec jsa1212_channels[] = {
>> +	{
>> +		.type = IIO_LIGHT,
>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>> +			BIT(IIO_CHAN_INFO_SCALE),
>> +	},
>> +	{
>> +		.type = IIO_PROXIMITY,
>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>> +	}
>> +};
>> +
>> +static const struct iio_info jsa1212_info = {
>> +	.driver_module		= THIS_MODULE,
>> +	.read_raw		= &jsa1212_read_raw,
>> +};
>> +
>> +static int jsa1212_chip_init(struct jsa1212_data *data)
>> +{
>> +	int ret;
>> +
>> +	ret = regmap_write(data->regmap, JSA1212_CONF_REG,
>> +				(JSA1212_CONF_PXS_SLP_50MS |
>> +				JSA1212_CONF_IRDR_ENABLE));
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = regmap_write(data->regmap, JSA1212_INT_REG,
>> +				JSA1212_INT_ALS_PRST_4CONV);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
> 
> should the range setting be written to the chip?
> 
>> +
>> +	return 0;
>> +}
>> +
>> +static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
Why pass *dev?
>> +{
>> +	switch (reg) {
>> +	case JSA1212_PXS_DATA_REG:
>> +	case JSA1212_ALS_DT1_REG:
>> +	case JSA1212_ALS_DT2_REG:
>> +	case JSA1212_INT_REG:
>> +		return true;
>> +	default:
>> +		return false;
>> +	}
>> +}
>> +
>> +static struct regmap_config jsa1212_regmap_config = {
>> +	.name =  JSA1212_REGMAP_NAME,
>> +	.reg_bits = 8,
>> +	.val_bits = 8,
>> +	.max_register = JSA1212_MAX_REG,
>> +	.cache_type = REGCACHE_RBTREE,
>> +	.volatile_reg = jsa1212_is_volatile_reg,
>> +};
>> +
>> +static int jsa1212_probe(struct i2c_client *client,
>> +			     const struct i2c_device_id *id)
Adjust indentation of second line of parameters to the left.
>> +{
>> +	struct jsa1212_data *jsa1212_data;
I think you should not name the instance of a variable the sames as its type.
>> +	struct iio_dev *indio_dev;
>> +	struct regmap *regmap;
>> +	int ret;
>> +
>> +	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
>> +		return -ENODEV;
>> +
>> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*jsa1212_data));
>> +	if (!indio_dev)
>> +		return -ENOMEM;
>> +
>> +	regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
>> +	if (IS_ERR(regmap)) {
>> +		dev_err(&client->dev, "Regmap initialization failed.\n");
>> +		return PTR_ERR(regmap);
>> +	}
>> +
>> +	jsa1212_data = iio_priv(indio_dev);
>> +
>> +	i2c_set_clientdata(client, indio_dev);
>> +	jsa1212_data->client = client;
>> +	jsa1212_data->regmap = regmap;
>> +
>> +	mutex_init(&jsa1212_data->lock);
>> +
>> +	ret = jsa1212_chip_init(jsa1212_data);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	indio_dev->dev.parent = &client->dev;
>> +	indio_dev->channels = jsa1212_channels;
>> +	indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
>> +	indio_dev->name = JSA1212_DRIVER_NAME;
>> +	indio_dev->modes = INDIO_DIRECT_MODE;
>> +
>> +	indio_dev->info = &jsa1212_info;
>> +
>> +	ret = iio_device_register(indio_dev);
>> +	if (ret < 0) {
>> +		dev_err(&client->dev, "%s: register device failed\n", __func__);
>> +		return ret;
>> +	}
Or just
	if (ret < 0)
		dev_err(...);
	return ret;
And what about setting JSA1212_CONF_IRDR_DISABLE in case iio_device_register fails? Would that leave the IR-LED on?
>> +
>> +	return 0;
>> +}
>> +
>> + /* power off the device */
>> +static int jsa1212_power_off(struct jsa1212_data *data)
>> +{
>> +	int ret;
>> +
>> +	mutex_lock(&data->lock);
>> +
>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>> +				JSA1212_CONF_ALS_MASK |
>> +				JSA1212_CONF_PXS_MASK,
>> +				JSA1212_CONF_ALS_DISABLE |
>> +				JSA1212_CONF_PXS_DISABLE);
What about JSA1212_CONF_IRDR_DISABLE?
>> +
>> +	if (ret < 0)
>> +		dev_err(&data->client->dev, "power off cmd failed\n");
>> +
>> +	mutex_unlock(&data->lock);
>> +
>> +	return ret;
>> +}
>> +
> 
> drop extra newline
> 
>> +
>> +static int jsa1212_remove(struct i2c_client *client)
>> +{
>> +	struct iio_dev *indio_dev = i2c_get_clientdata(client);
>> +	struct jsa1212_data *data = iio_priv(indio_dev);
>> +
>> +	iio_device_unregister(indio_dev);
>> +
>> +	return jsa1212_power_off(data);
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int jsa1212_suspend(struct device *dev)
>> +{
>> +	struct jsa1212_data *data;
>> +
>> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
>> +
>> +	return jsa1212_power_off(data);
>> +}
>> +
>> +static int jsa1212_resume(struct device *dev)
>> +{
>> +	int ret = 0;
>> +	struct jsa1212_data *data;
>> +
>> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
>> +
>> +	mutex_lock(&data->lock);
>> +
>> +	if (data->als_en) {
>> +		ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
>> +		if (ret < 0) {
>> +			dev_err(dev, "als resume failed\n");
>> +			goto unlock_and_ret;
>> +		}
>> +	}
>> +
>> +	if (data->pxs_en) {
>> +		ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
>> +		if (ret < 0)
>> +			dev_err(dev, "pxs resume failed\n");
>> +	}
>> +
>> +unlock_and_ret:
>> +	mutex_unlock(&data->lock);
>> +	return ret;
>> +}
>> +
>> +static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
>> +
>> +#define JSA1212_PM_OPS (&jsa1212_pm_ops)
>> +#else
>> +#define JSA1212_PM_OPS NULL
>> +#endif
>> +
>> +static const struct acpi_device_id jsa1212_acpi_match[] = {
>> +	{"JSA1212", 0},
>> +	{ },
>> +};
>> +MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
>> +
>> +static const struct i2c_device_id jsa1212_id[] = {
>> +	{ JSA1212_DRIVER_NAME, 0 },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(i2c, jsa1212_id);
>> +
>> +static struct i2c_driver jsa1212_driver = {
>> +	.driver = {
>> +		.name	= JSA1212_DRIVER_NAME,
>> +		.pm	= JSA1212_PM_OPS,
>> +		.owner	= THIS_MODULE,
>> +		.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
>> +	},
>> +	.probe		= jsa1212_probe,
>> +	.remove		= jsa1212_remove,
>> +	.id_table	= jsa1212_id,
>> +};
>> +module_i2c_driver(jsa1212_driver);
>> +
>> +MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
>> +MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
>> +MODULE_LICENSE("GPL v2");
>>
> 

Re: [PATCH v5 1/1] iio: jsa1212: Add JSA1212 proximity/ALS sensor

[Jonathan Cameron]

On 14/09/14 13:14, Hartmut Knaack wrote:
> Peter Meerwald schrieb, Am 12.09.2014 15:05:
>>> This patch adds a new driver for solteam opto JSA1212 proximity and
>>> ambient light sensor.
>>
>> minor nitpicking below
> Some comments from me as well.
one comment on a comment from me ;)  Otherwise, Peter and Hartmut seem to have
everything well covered! Good reviews and a pretty good driver makes me
happy :)

Jonathan
>>
>>>
>>> Basic details of the chip can be found here.
>>>
>>> http://www.solteamopto.com.tw/detail.php?ms=3&po_unit=2&pt_unit=29&p_unit=120
>>>
>>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>>> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
>>> ---
>>>  drivers/iio/light/Kconfig   |  10 +
>>>  drivers/iio/light/Makefile  |   1 +
>>>  drivers/iio/light/jsa1212.c | 488 ++++++++++++++++++++++++++++++++++++++++++++
>>>  3 files changed, 499 insertions(+)
>>>  create mode 100644 drivers/iio/light/jsa1212.c
>>>
>>> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
>>> index bf05ca5..b81d8a3 100644
>>> --- a/drivers/iio/light/Kconfig
>>> +++ b/drivers/iio/light/Kconfig
>>> @@ -99,6 +99,16 @@ config HID_SENSOR_PROX
>>>  	  To compile this driver as a module, choose M here: the
>>>  	  module will be called hid-sensor-prox.
>>>  
>>> +config JSA1212
>>> +	tristate "JSA1212 ALS and proximity sensor driver"
>>> +	depends on I2C
>>> +	help
>>> +	 Say Y here if you want to build a IIO driver for JSA1212
>>> +	 proximity & ALS sensor device.
>>> +
>>> +	 To compile this driver as a module, choose M here:
>>> +	 the module will be called jsa1212.
>>> +
>>>  config SENSORS_LM3533
>>>  	tristate "LM3533 ambient light sensor"
>>>  	depends on MFD_LM3533
>>> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
>>> index 8b8c09f..23c6aa9 100644
>>> --- a/drivers/iio/light/Makefile
>>> +++ b/drivers/iio/light/Makefile
>>> @@ -11,6 +11,7 @@ obj-$(CONFIG_GP2AP020A00F)	+= gp2ap020a00f.o
>>>  obj-$(CONFIG_HID_SENSOR_ALS)	+= hid-sensor-als.o
>>>  obj-$(CONFIG_HID_SENSOR_PROX)	+= hid-sensor-prox.o
>>>  obj-$(CONFIG_ISL29125)		+= isl29125.o
>>> +obj-$(CONFIG_JSA1212)		+= jsa1212.o
>>>  obj-$(CONFIG_SENSORS_LM3533)	+= lm3533-als.o
>>>  obj-$(CONFIG_LTR501)		+= ltr501.o
>>>  obj-$(CONFIG_SENSORS_TSL2563)	+= tsl2563.o
>>> diff --git a/drivers/iio/light/jsa1212.c b/drivers/iio/light/jsa1212.c
>>> new file mode 100644
>>> index 0000000..a7ee0ef
>>> --- /dev/null
>>> +++ b/drivers/iio/light/jsa1212.c
>>> @@ -0,0 +1,488 @@
>>> +/*
>>> + * JSA1212 Ambient Light & Proximity Sensor Driver
>>> + *
>>> + * Copyright (c) 2014, Intel Corporation.
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify it
>>> + * under the terms and conditions of the GNU General Public License,
>>> + * version 2, as published by the Free Software Foundation.
>>> + *
>>> + * This program is distributed in the hope it will be useful, but WITHOUT
>>> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>>> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
>>> + * more details.
>>> + *
>>> + * JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
>>> + *
>>> + * TODO: Interrupt support, thresholds, range support.
>>> + */
>>> +
>>> +#include <linux/kernel.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/module.h>
>>> +#include <linux/moduleparam.h>
>>
>> I don't think moduleparam is needed
>>
>>> +#include <linux/delay.h>
>>> +#include <linux/i2c.h>
>>> +#include <linux/mutex.h>
>>> +#include <linux/slab.h>
>>
>> slab is included twice (see above)
>>
>>> +#include <linux/acpi.h>
>>> +#include <linux/regmap.h>
>>> +#include <linux/iio/iio.h>
>>> +#include <linux/iio/sysfs.h>
>>> +
>>> +/* JSA1212 reg address */
>>> +#define JSA1212_CONF_REG		0x01
>>> +#define JSA1212_INT_REG			0x02
>>> +#define JSA1212_PXS_LT_REG		0x03
>>> +#define JSA1212_PXS_HT_REG		0x04
>>> +#define JSA1212_ALS_TH1_REG		0x05
>>> +#define JSA1212_ALS_TH2_REG		0x06
>>> +#define JSA1212_ALS_TH3_REG		0x07
>>> +#define JSA1212_PXS_DATA_REG		0x08
>>> +#define JSA1212_ALS_DT1_REG		0x09
>>> +#define JSA1212_ALS_DT2_REG		0x0A
>>> +#define JSA1212_ALS_RNG_REG		0x0B
>>> +#define JSA1212_MAX_REG			0x0C
>>> +
>>> +/* JSA1212 reg masks */
>>> +#define JSA1212_CONF_MASK		0xFF
>>> +#define JSA1212_INT_MASK		0xFF
>>> +#define JSA1212_PXS_LT_MASK		0xFF
>>> +#define JSA1212_PXS_HT_MASK		0xFF
>>> +#define JSA1212_ALS_TH1_MASK		0xFF
>>> +#define JSA1212_ALS_TH2_LT_MASK		0x0F
>>> +#define JSA1212_ALS_TH2_HT_MASK		0xF0
>>> +#define JSA1212_ALS_TH3_MASK		0xFF
>>> +#define JSA1212_PXS_DATA_MASK		0xFF
>>> +#define JSA1212_ALS_DATA_MASK		0x0FFF
>>> +#define JSA1212_ALS_DT1_MASK		0xFF
>>> +#define JSA1212_ALS_DT2_MASK		0x0F
>>> +#define JSA1212_ALS_RNG_MASK		0x07
>>> +#define JSA1212_REG_MASK		0xFF
>>
>> REG_MASK is not used -- what would it be for?
>>
>>> +
>>> +/* JSA1212 CONF REG bits */
>>> +#define JSA1212_CONF_PXS_MASK		0x80
>>> +#define JSA1212_CONF_PXS_ENABLE		0x80
>>> +#define JSA1212_CONF_PXS_DISABLE	0x00
>>> +#define JSA1212_CONF_ALS_MASK		0x04
>>> +#define JSA1212_CONF_ALS_ENABLE		0x04
>>> +#define JSA1212_CONF_ALS_DISABLE	0x00
>>> +#define JSA1212_CONF_IRDR_MASK		0x08
>>> +#define JSA1212_CONF_IRDR_ENABLE	0x08
>>> +#define JSA1212_CONF_IRDR_DISABLE	0x00
>>> +#define JSA1212_CONF_PXS_SLP_MASK	0x70
>>> +#define JSA1212_CONF_PXS_SLP_0MS	0x70
>>> +#define JSA1212_CONF_PXS_SLP_12MS	0x60
>>> +#define JSA1212_CONF_PXS_SLP_50MS	0x50
>>> +#define JSA1212_CONF_PXS_SLP_75MS	0x40
>>> +#define JSA1212_CONF_PXS_SLP_100MS	0x30
>>> +#define JSA1212_CONF_PXS_SLP_200MS	0x20
>>> +#define JSA1212_CONF_PXS_SLP_400MS	0x10
>>> +#define JSA1212_CONF_PXS_SLP_800MS	0x00
>>> +
>>> +/* JSA1212 INT REG bits */
>>> +#define JSA1212_INT_CTRL_MASK		0x01
>>> +#define JSA1212_INT_CTRL_EITHER		0x00
>>> +#define JSA1212_INT_CTRL_BOTH		0x01
>>> +#define JSA1212_INT_ALS_PRST_MASK	0x06
>>> +#define JSA1212_INT_ALS_PRST_1CONV	0x00
>>> +#define JSA1212_INT_ALS_PRST_4CONV	0x02
>>> +#define JSA1212_INT_ALS_PRST_8CONV	0x04
>>> +#define JSA1212_INT_ALS_PRST_16CONV	0x06
>>> +#define JSA1212_INT_ALS_FLAG_MASK	0x08
>>> +#define JSA1212_INT_ALS_FLAG_CLR	0x00
>>> +#define JSA1212_INT_PXS_PRST_MASK	0x60
>>> +#define JSA1212_INT_PXS_PRST_1CONV	0x00
>>> +#define JSA1212_INT_PXS_PRST_4CONV	0x20
>>> +#define JSA1212_INT_PXS_PRST_8CONV	0x40
>>> +#define JSA1212_INT_PXS_PRST_16CONV	0x60
>>> +#define JSA1212_INT_PXS_FLAG_MASK	0x80
>>> +#define JSA1212_INT_PXS_FLAG_CLR	0x00
>>> +
>>> +/* JSA1212 ALS RNG REG bits */
>>> +#define JSA1212_ALS_RNG_0_2048		0x00
>>> +#define JSA1212_ALS_RNG_0_1024		0x01
>>> +#define JSA1212_ALS_RNG_0_512		0x02
>>> +#define JSA1212_ALS_RNG_0_256		0x03
>>> +#define JSA1212_ALS_RNG_0_128		0x04
>>> +
>>> +/* JSA1212 INT threshold range */
>>> +#define JSA1212_ALS_TH_MIN	0x0000
>>> +#define JSA1212_ALS_TH_MAX	0x0FFF
>>> +#define JSA1212_PXS_TH_MIN	0x00
>>> +#define JSA1212_PXS_TH_MAX	0xFF
>>> +
>>> +#define JSA1212_ALS_DELAY_MS	0xC8
>>> +#define JSA1212_PXS_DELAY_MS	0x64
> Shouldn't these delays be in human-readable format? Like 200 and 100?
>>> +
>>> +#define JSA1212_DRIVER_NAME	"jsa1212"
>>> +#define JSA1212_REGMAP_NAME	"jsa1212_regmap"
>>> +
>>> +enum jsa1212_op_mode {
>>> +	JSA1212_OPMODE_ALS_EN,
>>> +	JSA1212_OPMODE_PXS_EN,
>>> +};
>>> +
>>> +struct jsa1212_data {
>>> +	struct i2c_client *client;
>>> +	struct mutex lock;
>>> +	u8 als_rng_idx;
>>> +	bool als_en; /* ALS enable status */
>>> +	bool pxs_en; /* proximity enable status */
>>> +	struct regmap *regmap;
>>> +};
>>> +
>>> +/* ALS range idx to val mapping */
>>> +static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
>>> +						128, 128, 128};
>>> +
>>> +/* Enables or disables ALS function based on status */
>>> +static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
>>> +{
>>> +	int ret;
>>> +
>>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>>> +				JSA1212_CONF_ALS_MASK,
>>> +				status);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	data->als_en = status ? true : false;
> data->als_en = !!status;
>>> +
>>> +	return ret;
> Just return 0; to indicate successful termination.
>>> +}
>>> +
>>> +/* Enables or disables PXS function based on status */
>>> +static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
>>> +{
>>> +	int ret;
>>> +
>>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>>> +				JSA1212_CONF_PXS_MASK,
>>> +				status);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	data->pxs_en = status ? true : false;
>>> +
>>> +	return ret;
> Same applies here.
>>> +}
>>> +
>>> +static int jsa1212_read_als_data(struct jsa1212_data *data,
>>> +				unsigned int *val)
>>> +{
>>> +	int ret;
>>> +	u8 als_data[2];
>>
>> __le16 als_data;
>>
>> should make the conversion below simpler: *val = le16_to_cpu(als_data);
>>
>>> +
>>> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	/* Delay for data output */
>>> +	msleep(JSA1212_ALS_DELAY_MS);
>>> +
>>> +	/* Read 12 bit data */
>>> +	ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, als_data, 2);
>>> +	if (ret < 0) {
>>> +		dev_err(&data->client->dev, "als data read err\n");
>>> +		goto als_data_read_err;
>>> +	}
>>> +
>>> +	*val = le16_to_cpup((__le16 *)als_data);
>>> +
>>> +als_data_read_err:
>>> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
>>
>> simply 
>> return jsa1212_als_enable(..)
>>
>> drop lines below
>>
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int jsa1212_read_pxs_data(struct jsa1212_data *data,
>>> +				unsigned int *val)
>>> +{
>>> +	int ret;
>>> +	unsigned int pxs_data;
>>> +
>>> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	/* Delay for data output */
>>> +	msleep(JSA1212_PXS_DELAY_MS);
>>> +
>>> +	/* Read out all data */
>>> +	ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
>>> +	if (ret < 0) {
>>> +		dev_err(&data->client->dev, "pxs data read err\n");
>>> +		goto pxs_data_read_err;
>>> +	}
>>> +
>>> +	*val = pxs_data & JSA1212_PXS_DATA_MASK;
>>> +
>>> +pxs_data_read_err:
>>
>> simply 
>> return jsa1212_als_enable(..)
>>
>> drop lines below
>>
>>> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int jsa1212_read_raw(struct iio_dev *indio_dev,
>>> +				struct iio_chan_spec const *chan,
>>> +				int *val, int *val2, long mask)
>>> +{
>>> +	int ret;
>>> +	struct jsa1212_data *data = iio_priv(indio_dev);
>>> +
>>> +	switch (mask) {
>>> +	case IIO_CHAN_INFO_RAW:
>>> +		mutex_lock(&data->lock);
>>> +		switch (chan->type) {
>>> +		case IIO_LIGHT:
>>> +			ret = jsa1212_read_als_data(data, val);
>>> +			break;
>>> +		case IIO_PROXIMITY:
>>> +			ret = jsa1212_read_pxs_data(data, val);
>>> +			break;
>>> +		default:
>>> +			ret = -EINVAL;
>>> +			break;
>>> +		}
>>> +		ret = ret < 0 ? ret : IIO_VAL_INT;
>>> +		mutex_unlock(&data->lock);
>>
>> could move mutex_unlock() one line up
> And return ret or IIO_VAL_INT directly here, making the break below obsolete.
>>
>>> +		break;
>>> +	case IIO_CHAN_INFO_SCALE:
>>> +		switch (chan->type) {
>>> +		case IIO_LIGHT:
>>> +			*val = jsa1212_als_range_val[data->als_rng_idx];
>>> +			*val2 = BIT(12); /* Max 12 bit value */
>>> +			ret = IIO_VAL_FRACTIONAL;
> Better: define JSA1212_ALS_RESOLUTION and use it here for *val2. Then just return IIO_VAL_FRACTIONAL_LOG2.
> You can also drop the following lines or keep the default sections empty and just return -EINVAL at the end.
>>> +			break;
>>> +		default:
>>> +			ret = -EINVAL;
>>> +			break;
>>> +		}
>>> +		break;
>>> +	default:
>>> +		ret = -EINVAL;
>>> +		break;
>>> +	}
>>> +
>>> +	return ret;
>>> +}
>>> +
>>> +static const struct iio_chan_spec jsa1212_channels[] = {
>>> +	{
>>> +		.type = IIO_LIGHT,
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>>> +			BIT(IIO_CHAN_INFO_SCALE),
>>> +	},
>>> +	{
>>> +		.type = IIO_PROXIMITY,
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>>> +	}
>>> +};
>>> +
>>> +static const struct iio_info jsa1212_info = {
>>> +	.driver_module		= THIS_MODULE,
>>> +	.read_raw		= &jsa1212_read_raw,
>>> +};
>>> +
>>> +static int jsa1212_chip_init(struct jsa1212_data *data)
>>> +{
>>> +	int ret;
>>> +
>>> +	ret = regmap_write(data->regmap, JSA1212_CONF_REG,
>>> +				(JSA1212_CONF_PXS_SLP_50MS |
>>> +				JSA1212_CONF_IRDR_ENABLE));
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	ret = regmap_write(data->regmap, JSA1212_INT_REG,
>>> +				JSA1212_INT_ALS_PRST_4CONV);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
>>
>> should the range setting be written to the chip?
>>
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
> Why pass *dev?
It's a callback function, so you have to keep to the relevant form.
>>> +{
>>> +	switch (reg) {
>>> +	case JSA1212_PXS_DATA_REG:
>>> +	case JSA1212_ALS_DT1_REG:
>>> +	case JSA1212_ALS_DT2_REG:
>>> +	case JSA1212_INT_REG:
>>> +		return true;
>>> +	default:
>>> +		return false;
>>> +	}
>>> +}
>>> +
>>> +static struct regmap_config jsa1212_regmap_config = {
>>> +	.name =  JSA1212_REGMAP_NAME,
>>> +	.reg_bits = 8,
>>> +	.val_bits = 8,
>>> +	.max_register = JSA1212_MAX_REG,
>>> +	.cache_type = REGCACHE_RBTREE,
>>> +	.volatile_reg = jsa1212_is_volatile_reg,
>>> +};
>>> +
>>> +static int jsa1212_probe(struct i2c_client *client,
>>> +			     const struct i2c_device_id *id)
> Adjust indentation of second line of parameters to the left.
>>> +{
>>> +	struct jsa1212_data *jsa1212_data;
> I think you should not name the instance of a variable the sames as its type.
>>> +	struct iio_dev *indio_dev;
>>> +	struct regmap *regmap;
>>> +	int ret;
>>> +
>>> +	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
>>> +		return -ENODEV;
>>> +
>>> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*jsa1212_data));
>>> +	if (!indio_dev)
>>> +		return -ENOMEM;
>>> +
>>> +	regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
>>> +	if (IS_ERR(regmap)) {
>>> +		dev_err(&client->dev, "Regmap initialization failed.\n");
>>> +		return PTR_ERR(regmap);
>>> +	}
>>> +
>>> +	jsa1212_data = iio_priv(indio_dev);
>>> +
>>> +	i2c_set_clientdata(client, indio_dev);
>>> +	jsa1212_data->client = client;
>>> +	jsa1212_data->regmap = regmap;
>>> +
>>> +	mutex_init(&jsa1212_data->lock);
>>> +
>>> +	ret = jsa1212_chip_init(jsa1212_data);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	indio_dev->dev.parent = &client->dev;
>>> +	indio_dev->channels = jsa1212_channels;
>>> +	indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
>>> +	indio_dev->name = JSA1212_DRIVER_NAME;
>>> +	indio_dev->modes = INDIO_DIRECT_MODE;
>>> +
>>> +	indio_dev->info = &jsa1212_info;
>>> +
>>> +	ret = iio_device_register(indio_dev);
>>> +	if (ret < 0) {
>>> +		dev_err(&client->dev, "%s: register device failed\n", __func__);
>>> +		return ret;
>>> +	}
> Or just
> 	if (ret < 0)
> 		dev_err(...);
> 	return ret;
> And what about setting JSA1212_CONF_IRDR_DISABLE in case iio_device_register fails? Would that leave the IR-LED on?
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> + /* power off the device */
>>> +static int jsa1212_power_off(struct jsa1212_data *data)
>>> +{
>>> +	int ret;
>>> +
>>> +	mutex_lock(&data->lock);
>>> +
>>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>>> +				JSA1212_CONF_ALS_MASK |
>>> +				JSA1212_CONF_PXS_MASK,
>>> +				JSA1212_CONF_ALS_DISABLE |
>>> +				JSA1212_CONF_PXS_DISABLE);
> What about JSA1212_CONF_IRDR_DISABLE?
>>> +
>>> +	if (ret < 0)
>>> +		dev_err(&data->client->dev, "power off cmd failed\n");
>>> +
>>> +	mutex_unlock(&data->lock);
>>> +
>>> +	return ret;
>>> +}
>>> +
>>
>> drop extra newline
>>
>>> +
>>> +static int jsa1212_remove(struct i2c_client *client)
>>> +{
>>> +	struct iio_dev *indio_dev = i2c_get_clientdata(client);
>>> +	struct jsa1212_data *data = iio_priv(indio_dev);
>>> +
>>> +	iio_device_unregister(indio_dev);
>>> +
>>> +	return jsa1212_power_off(data);
>>> +}
>>> +
>>> +#ifdef CONFIG_PM_SLEEP
>>> +static int jsa1212_suspend(struct device *dev)
>>> +{
>>> +	struct jsa1212_data *data;
>>> +
>>> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
>>> +
>>> +	return jsa1212_power_off(data);
>>> +}
>>> +
>>> +static int jsa1212_resume(struct device *dev)
>>> +{
>>> +	int ret = 0;
>>> +	struct jsa1212_data *data;
>>> +
>>> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
>>> +
>>> +	mutex_lock(&data->lock);
>>> +
>>> +	if (data->als_en) {
>>> +		ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
>>> +		if (ret < 0) {
>>> +			dev_err(dev, "als resume failed\n");
>>> +			goto unlock_and_ret;
>>> +		}
>>> +	}
>>> +
>>> +	if (data->pxs_en) {
>>> +		ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
>>> +		if (ret < 0)
>>> +			dev_err(dev, "pxs resume failed\n");
>>> +	}
>>> +
>>> +unlock_and_ret:
>>> +	mutex_unlock(&data->lock);
>>> +	return ret;
>>> +}
>>> +
>>> +static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
>>> +
>>> +#define JSA1212_PM_OPS (&jsa1212_pm_ops)
>>> +#else
>>> +#define JSA1212_PM_OPS NULL
>>> +#endif
>>> +
>>> +static const struct acpi_device_id jsa1212_acpi_match[] = {
>>> +	{"JSA1212", 0},
>>> +	{ },
>>> +};
>>> +MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
>>> +
>>> +static const struct i2c_device_id jsa1212_id[] = {
>>> +	{ JSA1212_DRIVER_NAME, 0 },
>>> +	{ }
>>> +};
>>> +MODULE_DEVICE_TABLE(i2c, jsa1212_id);
>>> +
>>> +static struct i2c_driver jsa1212_driver = {
>>> +	.driver = {
>>> +		.name	= JSA1212_DRIVER_NAME,
>>> +		.pm	= JSA1212_PM_OPS,
>>> +		.owner	= THIS_MODULE,
>>> +		.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
>>> +	},
>>> +	.probe		= jsa1212_probe,
>>> +	.remove		= jsa1212_remove,
>>> +	.id_table	= jsa1212_id,
>>> +};
>>> +module_i2c_driver(jsa1212_driver);
>>> +
>>> +MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
>>> +MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
>>> +MODULE_LICENSE("GPL v2");
>>>
>>
> 

Re: [PATCH v5 1/1] iio: jsa1212: Add JSA1212 proximity/ALS sensor

[sathyanarayanan kuppuswamy]

Hi Peter,

Thanks for your valuable comments. I agree with all of your suggestions. 
I have fixed them in PATCH v6.

On 09/12/2014 06:05 AM, Peter Meerwald wrote:
>> This patch adds a new driver for solteam opto JSA1212 proximity and
>> ambient light sensor.
> minor nitpicking below
>
>> Basic details of the chip can be found here.
>>
>> http://www.solteamopto.com.tw/detail.php?ms=3&po_unit=2&pt_unit=29&p_unit=120
>>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
>> ---
>>   drivers/iio/light/Kconfig   |  10 +
>>   drivers/iio/light/Makefile  |   1 +
>>   drivers/iio/light/jsa1212.c | 488 ++++++++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 499 insertions(+)
>>   create mode 100644 drivers/iio/light/jsa1212.c
>>
>> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
>> index bf05ca5..b81d8a3 100644
>> --- a/drivers/iio/light/Kconfig
>> +++ b/drivers/iio/light/Kconfig
>> @@ -99,6 +99,16 @@ config HID_SENSOR_PROX
>>   	  To compile this driver as a module, choose M here: the
>>   	  module will be called hid-sensor-prox.
>>   
>> +config JSA1212
>> +	tristate "JSA1212 ALS and proximity sensor driver"
>> +	depends on I2C
>> +	help
>> +	 Say Y here if you want to build a IIO driver for JSA1212
>> +	 proximity & ALS sensor device.
>> +
>> +	 To compile this driver as a module, choose M here:
>> +	 the module will be called jsa1212.
>> +
>>   config SENSORS_LM3533
>>   	tristate "LM3533 ambient light sensor"
>>   	depends on MFD_LM3533
>> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
>> index 8b8c09f..23c6aa9 100644
>> --- a/drivers/iio/light/Makefile
>> +++ b/drivers/iio/light/Makefile
>> @@ -11,6 +11,7 @@ obj-$(CONFIG_GP2AP020A00F)	+= gp2ap020a00f.o
>>   obj-$(CONFIG_HID_SENSOR_ALS)	+= hid-sensor-als.o
>>   obj-$(CONFIG_HID_SENSOR_PROX)	+= hid-sensor-prox.o
>>   obj-$(CONFIG_ISL29125)		+= isl29125.o
>> +obj-$(CONFIG_JSA1212)		+= jsa1212.o
>>   obj-$(CONFIG_SENSORS_LM3533)	+= lm3533-als.o
>>   obj-$(CONFIG_LTR501)		+= ltr501.o
>>   obj-$(CONFIG_SENSORS_TSL2563)	+= tsl2563.o
>> diff --git a/drivers/iio/light/jsa1212.c b/drivers/iio/light/jsa1212.c
>> new file mode 100644
>> index 0000000..a7ee0ef
>> --- /dev/null
>> +++ b/drivers/iio/light/jsa1212.c
>> @@ -0,0 +1,488 @@
>> +/*
>> + * JSA1212 Ambient Light & Proximity Sensor Driver
>> + *
>> + * Copyright (c) 2014, Intel Corporation.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms and conditions of the GNU General Public License,
>> + * version 2, as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope it will be useful, but WITHOUT
>> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
>> + * more details.
>> + *
>> + * JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
>> + *
>> + * TODO: Interrupt support, thresholds, range support.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/moduleparam.h>
> I don't think moduleparam is needed
>
>> +#include <linux/delay.h>
>> +#include <linux/i2c.h>
>> +#include <linux/mutex.h>
>> +#include <linux/slab.h>
> slab is included twice (see above)
>
>> +#include <linux/acpi.h>
>> +#include <linux/regmap.h>
>> +#include <linux/iio/iio.h>
>> +#include <linux/iio/sysfs.h>
>> +
>> +/* JSA1212 reg address */
>> +#define JSA1212_CONF_REG		0x01
>> +#define JSA1212_INT_REG			0x02
>> +#define JSA1212_PXS_LT_REG		0x03
>> +#define JSA1212_PXS_HT_REG		0x04
>> +#define JSA1212_ALS_TH1_REG		0x05
>> +#define JSA1212_ALS_TH2_REG		0x06
>> +#define JSA1212_ALS_TH3_REG		0x07
>> +#define JSA1212_PXS_DATA_REG		0x08
>> +#define JSA1212_ALS_DT1_REG		0x09
>> +#define JSA1212_ALS_DT2_REG		0x0A
>> +#define JSA1212_ALS_RNG_REG		0x0B
>> +#define JSA1212_MAX_REG			0x0C
>> +
>> +/* JSA1212 reg masks */
>> +#define JSA1212_CONF_MASK		0xFF
>> +#define JSA1212_INT_MASK		0xFF
>> +#define JSA1212_PXS_LT_MASK		0xFF
>> +#define JSA1212_PXS_HT_MASK		0xFF
>> +#define JSA1212_ALS_TH1_MASK		0xFF
>> +#define JSA1212_ALS_TH2_LT_MASK		0x0F
>> +#define JSA1212_ALS_TH2_HT_MASK		0xF0
>> +#define JSA1212_ALS_TH3_MASK		0xFF
>> +#define JSA1212_PXS_DATA_MASK		0xFF
>> +#define JSA1212_ALS_DATA_MASK		0x0FFF
>> +#define JSA1212_ALS_DT1_MASK		0xFF
>> +#define JSA1212_ALS_DT2_MASK		0x0F
>> +#define JSA1212_ALS_RNG_MASK		0x07
>> +#define JSA1212_REG_MASK		0xFF
> REG_MASK is not used -- what would it be for?
>
>> +
>> +/* JSA1212 CONF REG bits */
>> +#define JSA1212_CONF_PXS_MASK		0x80
>> +#define JSA1212_CONF_PXS_ENABLE		0x80
>> +#define JSA1212_CONF_PXS_DISABLE	0x00
>> +#define JSA1212_CONF_ALS_MASK		0x04
>> +#define JSA1212_CONF_ALS_ENABLE		0x04
>> +#define JSA1212_CONF_ALS_DISABLE	0x00
>> +#define JSA1212_CONF_IRDR_MASK		0x08
>> +#define JSA1212_CONF_IRDR_ENABLE	0x08
>> +#define JSA1212_CONF_IRDR_DISABLE	0x00
>> +#define JSA1212_CONF_PXS_SLP_MASK	0x70
>> +#define JSA1212_CONF_PXS_SLP_0MS	0x70
>> +#define JSA1212_CONF_PXS_SLP_12MS	0x60
>> +#define JSA1212_CONF_PXS_SLP_50MS	0x50
>> +#define JSA1212_CONF_PXS_SLP_75MS	0x40
>> +#define JSA1212_CONF_PXS_SLP_100MS	0x30
>> +#define JSA1212_CONF_PXS_SLP_200MS	0x20
>> +#define JSA1212_CONF_PXS_SLP_400MS	0x10
>> +#define JSA1212_CONF_PXS_SLP_800MS	0x00
>> +
>> +/* JSA1212 INT REG bits */
>> +#define JSA1212_INT_CTRL_MASK		0x01
>> +#define JSA1212_INT_CTRL_EITHER		0x00
>> +#define JSA1212_INT_CTRL_BOTH		0x01
>> +#define JSA1212_INT_ALS_PRST_MASK	0x06
>> +#define JSA1212_INT_ALS_PRST_1CONV	0x00
>> +#define JSA1212_INT_ALS_PRST_4CONV	0x02
>> +#define JSA1212_INT_ALS_PRST_8CONV	0x04
>> +#define JSA1212_INT_ALS_PRST_16CONV	0x06
>> +#define JSA1212_INT_ALS_FLAG_MASK	0x08
>> +#define JSA1212_INT_ALS_FLAG_CLR	0x00
>> +#define JSA1212_INT_PXS_PRST_MASK	0x60
>> +#define JSA1212_INT_PXS_PRST_1CONV	0x00
>> +#define JSA1212_INT_PXS_PRST_4CONV	0x20
>> +#define JSA1212_INT_PXS_PRST_8CONV	0x40
>> +#define JSA1212_INT_PXS_PRST_16CONV	0x60
>> +#define JSA1212_INT_PXS_FLAG_MASK	0x80
>> +#define JSA1212_INT_PXS_FLAG_CLR	0x00
>> +
>> +/* JSA1212 ALS RNG REG bits */
>> +#define JSA1212_ALS_RNG_0_2048		0x00
>> +#define JSA1212_ALS_RNG_0_1024		0x01
>> +#define JSA1212_ALS_RNG_0_512		0x02
>> +#define JSA1212_ALS_RNG_0_256		0x03
>> +#define JSA1212_ALS_RNG_0_128		0x04
>> +
>> +/* JSA1212 INT threshold range */
>> +#define JSA1212_ALS_TH_MIN	0x0000
>> +#define JSA1212_ALS_TH_MAX	0x0FFF
>> +#define JSA1212_PXS_TH_MIN	0x00
>> +#define JSA1212_PXS_TH_MAX	0xFF
>> +
>> +#define JSA1212_ALS_DELAY_MS	0xC8
>> +#define JSA1212_PXS_DELAY_MS	0x64
>> +
>> +#define JSA1212_DRIVER_NAME	"jsa1212"
>> +#define JSA1212_REGMAP_NAME	"jsa1212_regmap"
>> +
>> +enum jsa1212_op_mode {
>> +	JSA1212_OPMODE_ALS_EN,
>> +	JSA1212_OPMODE_PXS_EN,
>> +};
>> +
>> +struct jsa1212_data {
>> +	struct i2c_client *client;
>> +	struct mutex lock;
>> +	u8 als_rng_idx;
>> +	bool als_en; /* ALS enable status */
>> +	bool pxs_en; /* proximity enable status */
>> +	struct regmap *regmap;
>> +};
>> +
>> +/* ALS range idx to val mapping */
>> +static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
>> +						128, 128, 128};
>> +
>> +/* Enables or disables ALS function based on status */
>> +static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
>> +{
>> +	int ret;
>> +
>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>> +				JSA1212_CONF_ALS_MASK,
>> +				status);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	data->als_en = status ? true : false;
>> +
>> +	return ret;
>> +}
>> +
>> +/* Enables or disables PXS function based on status */
>> +static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
>> +{
>> +	int ret;
>> +
>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>> +				JSA1212_CONF_PXS_MASK,
>> +				status);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	data->pxs_en = status ? true : false;
>> +
>> +	return ret;
>> +}
>> +
>> +static int jsa1212_read_als_data(struct jsa1212_data *data,
>> +				unsigned int *val)
>> +{
>> +	int ret;
>> +	u8 als_data[2];
> __le16 als_data;
>
> should make the conversion below simpler: *val = le16_to_cpu(als_data);
>
>> +
>> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	/* Delay for data output */
>> +	msleep(JSA1212_ALS_DELAY_MS);
>> +
>> +	/* Read 12 bit data */
>> +	ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, als_data, 2);
>> +	if (ret < 0) {
>> +		dev_err(&data->client->dev, "als data read err\n");
>> +		goto als_data_read_err;
>> +	}
>> +
>> +	*val = le16_to_cpup((__le16 *)als_data);
>> +
>> +als_data_read_err:
>> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
> simply
> return jsa1212_als_enable(..)
>
> drop lines below
>
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return 0;
>> +}
>> +
>> +static int jsa1212_read_pxs_data(struct jsa1212_data *data,
>> +				unsigned int *val)
>> +{
>> +	int ret;
>> +	unsigned int pxs_data;
>> +
>> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	/* Delay for data output */
>> +	msleep(JSA1212_PXS_DELAY_MS);
>> +
>> +	/* Read out all data */
>> +	ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
>> +	if (ret < 0) {
>> +		dev_err(&data->client->dev, "pxs data read err\n");
>> +		goto pxs_data_read_err;
>> +	}
>> +
>> +	*val = pxs_data & JSA1212_PXS_DATA_MASK;
>> +
>> +pxs_data_read_err:
> simply
> return jsa1212_als_enable(..)
>
> drop lines below
>
>> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return 0;
>> +}
>> +
>> +static int jsa1212_read_raw(struct iio_dev *indio_dev,
>> +				struct iio_chan_spec const *chan,
>> +				int *val, int *val2, long mask)
>> +{
>> +	int ret;
>> +	struct jsa1212_data *data = iio_priv(indio_dev);
>> +
>> +	switch (mask) {
>> +	case IIO_CHAN_INFO_RAW:
>> +		mutex_lock(&data->lock);
>> +		switch (chan->type) {
>> +		case IIO_LIGHT:
>> +			ret = jsa1212_read_als_data(data, val);
>> +			break;
>> +		case IIO_PROXIMITY:
>> +			ret = jsa1212_read_pxs_data(data, val);
>> +			break;
>> +		default:
>> +			ret = -EINVAL;
>> +			break;
>> +		}
>> +		ret = ret < 0 ? ret : IIO_VAL_INT;
>> +		mutex_unlock(&data->lock);
> could move mutex_unlock() one line up
>
>> +		break;
>> +	case IIO_CHAN_INFO_SCALE:
>> +		switch (chan->type) {
>> +		case IIO_LIGHT:
>> +			*val = jsa1212_als_range_val[data->als_rng_idx];
>> +			*val2 = BIT(12); /* Max 12 bit value */
>> +			ret = IIO_VAL_FRACTIONAL;
>> +			break;
>> +		default:
>> +			ret = -EINVAL;
>> +			break;
>> +		}
>> +		break;
>> +	default:
>> +		ret = -EINVAL;
>> +		break;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static const struct iio_chan_spec jsa1212_channels[] = {
>> +	{
>> +		.type = IIO_LIGHT,
>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>> +			BIT(IIO_CHAN_INFO_SCALE),
>> +	},
>> +	{
>> +		.type = IIO_PROXIMITY,
>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>> +	}
>> +};
>> +
>> +static const struct iio_info jsa1212_info = {
>> +	.driver_module		= THIS_MODULE,
>> +	.read_raw		= &jsa1212_read_raw,
>> +};
>> +
>> +static int jsa1212_chip_init(struct jsa1212_data *data)
>> +{
>> +	int ret;
>> +
>> +	ret = regmap_write(data->regmap, JSA1212_CONF_REG,
>> +				(JSA1212_CONF_PXS_SLP_50MS |
>> +				JSA1212_CONF_IRDR_ENABLE));
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = regmap_write(data->regmap, JSA1212_INT_REG,
>> +				JSA1212_INT_ALS_PRST_4CONV);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
> should the range setting be written to the chip?
>
>> +
>> +	return 0;
>> +}
>> +
>> +static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
>> +{
>> +	switch (reg) {
>> +	case JSA1212_PXS_DATA_REG:
>> +	case JSA1212_ALS_DT1_REG:
>> +	case JSA1212_ALS_DT2_REG:
>> +	case JSA1212_INT_REG:
>> +		return true;
>> +	default:
>> +		return false;
>> +	}
>> +}
>> +
>> +static struct regmap_config jsa1212_regmap_config = {
>> +	.name =  JSA1212_REGMAP_NAME,
>> +	.reg_bits = 8,
>> +	.val_bits = 8,
>> +	.max_register = JSA1212_MAX_REG,
>> +	.cache_type = REGCACHE_RBTREE,
>> +	.volatile_reg = jsa1212_is_volatile_reg,
>> +};
>> +
>> +static int jsa1212_probe(struct i2c_client *client,
>> +			     const struct i2c_device_id *id)
>> +{
>> +	struct jsa1212_data *jsa1212_data;
>> +	struct iio_dev *indio_dev;
>> +	struct regmap *regmap;
>> +	int ret;
>> +
>> +	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
>> +		return -ENODEV;
>> +
>> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*jsa1212_data));
>> +	if (!indio_dev)
>> +		return -ENOMEM;
>> +
>> +	regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
>> +	if (IS_ERR(regmap)) {
>> +		dev_err(&client->dev, "Regmap initialization failed.\n");
>> +		return PTR_ERR(regmap);
>> +	}
>> +
>> +	jsa1212_data = iio_priv(indio_dev);
>> +
>> +	i2c_set_clientdata(client, indio_dev);
>> +	jsa1212_data->client = client;
>> +	jsa1212_data->regmap = regmap;
>> +
>> +	mutex_init(&jsa1212_data->lock);
>> +
>> +	ret = jsa1212_chip_init(jsa1212_data);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	indio_dev->dev.parent = &client->dev;
>> +	indio_dev->channels = jsa1212_channels;
>> +	indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
>> +	indio_dev->name = JSA1212_DRIVER_NAME;
>> +	indio_dev->modes = INDIO_DIRECT_MODE;
>> +
>> +	indio_dev->info = &jsa1212_info;
>> +
>> +	ret = iio_device_register(indio_dev);
>> +	if (ret < 0) {
>> +		dev_err(&client->dev, "%s: register device failed\n", __func__);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> + /* power off the device */
>> +static int jsa1212_power_off(struct jsa1212_data *data)
>> +{
>> +	int ret;
>> +
>> +	mutex_lock(&data->lock);
>> +
>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>> +				JSA1212_CONF_ALS_MASK |
>> +				JSA1212_CONF_PXS_MASK,
>> +				JSA1212_CONF_ALS_DISABLE |
>> +				JSA1212_CONF_PXS_DISABLE);
>> +
>> +	if (ret < 0)
>> +		dev_err(&data->client->dev, "power off cmd failed\n");
>> +
>> +	mutex_unlock(&data->lock);
>> +
>> +	return ret;
>> +}
>> +
> drop extra newline
>
>> +
>> +static int jsa1212_remove(struct i2c_client *client)
>> +{
>> +	struct iio_dev *indio_dev = i2c_get_clientdata(client);
>> +	struct jsa1212_data *data = iio_priv(indio_dev);
>> +
>> +	iio_device_unregister(indio_dev);
>> +
>> +	return jsa1212_power_off(data);
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int jsa1212_suspend(struct device *dev)
>> +{
>> +	struct jsa1212_data *data;
>> +
>> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
>> +
>> +	return jsa1212_power_off(data);
>> +}
>> +
>> +static int jsa1212_resume(struct device *dev)
>> +{
>> +	int ret = 0;
>> +	struct jsa1212_data *data;
>> +
>> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
>> +
>> +	mutex_lock(&data->lock);
>> +
>> +	if (data->als_en) {
>> +		ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
>> +		if (ret < 0) {
>> +			dev_err(dev, "als resume failed\n");
>> +			goto unlock_and_ret;
>> +		}
>> +	}
>> +
>> +	if (data->pxs_en) {
>> +		ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
>> +		if (ret < 0)
>> +			dev_err(dev, "pxs resume failed\n");
>> +	}
>> +
>> +unlock_and_ret:
>> +	mutex_unlock(&data->lock);
>> +	return ret;
>> +}
>> +
>> +static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
>> +
>> +#define JSA1212_PM_OPS (&jsa1212_pm_ops)
>> +#else
>> +#define JSA1212_PM_OPS NULL
>> +#endif
>> +
>> +static const struct acpi_device_id jsa1212_acpi_match[] = {
>> +	{"JSA1212", 0},
>> +	{ },
>> +};
>> +MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
>> +
>> +static const struct i2c_device_id jsa1212_id[] = {
>> +	{ JSA1212_DRIVER_NAME, 0 },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(i2c, jsa1212_id);
>> +
>> +static struct i2c_driver jsa1212_driver = {
>> +	.driver = {
>> +		.name	= JSA1212_DRIVER_NAME,
>> +		.pm	= JSA1212_PM_OPS,
>> +		.owner	= THIS_MODULE,
>> +		.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
>> +	},
>> +	.probe		= jsa1212_probe,
>> +	.remove		= jsa1212_remove,
>> +	.id_table	= jsa1212_id,
>> +};
>> +module_i2c_driver(jsa1212_driver);
>> +
>> +MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
>> +MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
>> +MODULE_LICENSE("GPL v2");
>>

-- 
Sathyanarayanan Kuppuswamy
Android kernel developer

Re: [PATCH v5 1/1] iio: jsa1212: Add JSA1212 proximity/ALS sensor

[sathyanarayanan kuppuswamy]

Hi Hartmut,

Thanks for your valuable comments. Please find my reply inline.

On 09/14/2014 05:14 AM, Hartmut Knaack wrote:
> Peter Meerwald schrieb, Am 12.09.2014 15:05:
>>> This patch adds a new driver for solteam opto JSA1212 proximity and
>>> ambient light sensor.
>> minor nitpicking below
> Some comments from me as well.
>>> Basic details of the chip can be found here.
>>>
>>> http://www.solteamopto.com.tw/detail.php?ms=3&po_unit=2&pt_unit=29&p_unit=120
>>>
>>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>>> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
>>> ---
>>>   drivers/iio/light/Kconfig   |  10 +
>>>   drivers/iio/light/Makefile  |   1 +
>>>   drivers/iio/light/jsa1212.c | 488 ++++++++++++++++++++++++++++++++++++++++++++
>>>   3 files changed, 499 insertions(+)
>>>   create mode 100644 drivers/iio/light/jsa1212.c
>>>
>>> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
>>> index bf05ca5..b81d8a3 100644
>>> --- a/drivers/iio/light/Kconfig
>>> +++ b/drivers/iio/light/Kconfig
>>> @@ -99,6 +99,16 @@ config HID_SENSOR_PROX
>>>   	  To compile this driver as a module, choose M here: the
>>>   	  module will be called hid-sensor-prox.
>>>   
>>> +config JSA1212
>>> +	tristate "JSA1212 ALS and proximity sensor driver"
>>> +	depends on I2C
>>> +	help
>>> +	 Say Y here if you want to build a IIO driver for JSA1212
>>> +	 proximity & ALS sensor device.
>>> +
>>> +	 To compile this driver as a module, choose M here:
>>> +	 the module will be called jsa1212.
>>> +
>>>   config SENSORS_LM3533
>>>   	tristate "LM3533 ambient light sensor"
>>>   	depends on MFD_LM3533
>>> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
>>> index 8b8c09f..23c6aa9 100644
>>> --- a/drivers/iio/light/Makefile
>>> +++ b/drivers/iio/light/Makefile
>>> @@ -11,6 +11,7 @@ obj-$(CONFIG_GP2AP020A00F)	+= gp2ap020a00f.o
>>>   obj-$(CONFIG_HID_SENSOR_ALS)	+= hid-sensor-als.o
>>>   obj-$(CONFIG_HID_SENSOR_PROX)	+= hid-sensor-prox.o
>>>   obj-$(CONFIG_ISL29125)		+= isl29125.o
>>> +obj-$(CONFIG_JSA1212)		+= jsa1212.o
>>>   obj-$(CONFIG_SENSORS_LM3533)	+= lm3533-als.o
>>>   obj-$(CONFIG_LTR501)		+= ltr501.o
>>>   obj-$(CONFIG_SENSORS_TSL2563)	+= tsl2563.o
>>> diff --git a/drivers/iio/light/jsa1212.c b/drivers/iio/light/jsa1212.c
>>> new file mode 100644
>>> index 0000000..a7ee0ef
>>> --- /dev/null
>>> +++ b/drivers/iio/light/jsa1212.c
>>> @@ -0,0 +1,488 @@
>>> +/*
>>> + * JSA1212 Ambient Light & Proximity Sensor Driver
>>> + *
>>> + * Copyright (c) 2014, Intel Corporation.
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify it
>>> + * under the terms and conditions of the GNU General Public License,
>>> + * version 2, as published by the Free Software Foundation.
>>> + *
>>> + * This program is distributed in the hope it will be useful, but WITHOUT
>>> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>>> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
>>> + * more details.
>>> + *
>>> + * JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
>>> + *
>>> + * TODO: Interrupt support, thresholds, range support.
>>> + */
>>> +
>>> +#include <linux/kernel.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/module.h>
>>> +#include <linux/moduleparam.h>
>> I don't think moduleparam is needed
>>
>>> +#include <linux/delay.h>
>>> +#include <linux/i2c.h>
>>> +#include <linux/mutex.h>
>>> +#include <linux/slab.h>
>> slab is included twice (see above)
>>
>>> +#include <linux/acpi.h>
>>> +#include <linux/regmap.h>
>>> +#include <linux/iio/iio.h>
>>> +#include <linux/iio/sysfs.h>
>>> +
>>> +/* JSA1212 reg address */
>>> +#define JSA1212_CONF_REG		0x01
>>> +#define JSA1212_INT_REG			0x02
>>> +#define JSA1212_PXS_LT_REG		0x03
>>> +#define JSA1212_PXS_HT_REG		0x04
>>> +#define JSA1212_ALS_TH1_REG		0x05
>>> +#define JSA1212_ALS_TH2_REG		0x06
>>> +#define JSA1212_ALS_TH3_REG		0x07
>>> +#define JSA1212_PXS_DATA_REG		0x08
>>> +#define JSA1212_ALS_DT1_REG		0x09
>>> +#define JSA1212_ALS_DT2_REG		0x0A
>>> +#define JSA1212_ALS_RNG_REG		0x0B
>>> +#define JSA1212_MAX_REG			0x0C
>>> +
>>> +/* JSA1212 reg masks */
>>> +#define JSA1212_CONF_MASK		0xFF
>>> +#define JSA1212_INT_MASK		0xFF
>>> +#define JSA1212_PXS_LT_MASK		0xFF
>>> +#define JSA1212_PXS_HT_MASK		0xFF
>>> +#define JSA1212_ALS_TH1_MASK		0xFF
>>> +#define JSA1212_ALS_TH2_LT_MASK		0x0F
>>> +#define JSA1212_ALS_TH2_HT_MASK		0xF0
>>> +#define JSA1212_ALS_TH3_MASK		0xFF
>>> +#define JSA1212_PXS_DATA_MASK		0xFF
>>> +#define JSA1212_ALS_DATA_MASK		0x0FFF
>>> +#define JSA1212_ALS_DT1_MASK		0xFF
>>> +#define JSA1212_ALS_DT2_MASK		0x0F
>>> +#define JSA1212_ALS_RNG_MASK		0x07
>>> +#define JSA1212_REG_MASK		0xFF
>> REG_MASK is not used -- what would it be for?
>>
>>> +
>>> +/* JSA1212 CONF REG bits */
>>> +#define JSA1212_CONF_PXS_MASK		0x80
>>> +#define JSA1212_CONF_PXS_ENABLE		0x80
>>> +#define JSA1212_CONF_PXS_DISABLE	0x00
>>> +#define JSA1212_CONF_ALS_MASK		0x04
>>> +#define JSA1212_CONF_ALS_ENABLE		0x04
>>> +#define JSA1212_CONF_ALS_DISABLE	0x00
>>> +#define JSA1212_CONF_IRDR_MASK		0x08
>>> +#define JSA1212_CONF_IRDR_ENABLE	0x08
>>> +#define JSA1212_CONF_IRDR_DISABLE	0x00
>>> +#define JSA1212_CONF_PXS_SLP_MASK	0x70
>>> +#define JSA1212_CONF_PXS_SLP_0MS	0x70
>>> +#define JSA1212_CONF_PXS_SLP_12MS	0x60
>>> +#define JSA1212_CONF_PXS_SLP_50MS	0x50
>>> +#define JSA1212_CONF_PXS_SLP_75MS	0x40
>>> +#define JSA1212_CONF_PXS_SLP_100MS	0x30
>>> +#define JSA1212_CONF_PXS_SLP_200MS	0x20
>>> +#define JSA1212_CONF_PXS_SLP_400MS	0x10
>>> +#define JSA1212_CONF_PXS_SLP_800MS	0x00
>>> +
>>> +/* JSA1212 INT REG bits */
>>> +#define JSA1212_INT_CTRL_MASK		0x01
>>> +#define JSA1212_INT_CTRL_EITHER		0x00
>>> +#define JSA1212_INT_CTRL_BOTH		0x01
>>> +#define JSA1212_INT_ALS_PRST_MASK	0x06
>>> +#define JSA1212_INT_ALS_PRST_1CONV	0x00
>>> +#define JSA1212_INT_ALS_PRST_4CONV	0x02
>>> +#define JSA1212_INT_ALS_PRST_8CONV	0x04
>>> +#define JSA1212_INT_ALS_PRST_16CONV	0x06
>>> +#define JSA1212_INT_ALS_FLAG_MASK	0x08
>>> +#define JSA1212_INT_ALS_FLAG_CLR	0x00
>>> +#define JSA1212_INT_PXS_PRST_MASK	0x60
>>> +#define JSA1212_INT_PXS_PRST_1CONV	0x00
>>> +#define JSA1212_INT_PXS_PRST_4CONV	0x20
>>> +#define JSA1212_INT_PXS_PRST_8CONV	0x40
>>> +#define JSA1212_INT_PXS_PRST_16CONV	0x60
>>> +#define JSA1212_INT_PXS_FLAG_MASK	0x80
>>> +#define JSA1212_INT_PXS_FLAG_CLR	0x00
>>> +
>>> +/* JSA1212 ALS RNG REG bits */
>>> +#define JSA1212_ALS_RNG_0_2048		0x00
>>> +#define JSA1212_ALS_RNG_0_1024		0x01
>>> +#define JSA1212_ALS_RNG_0_512		0x02
>>> +#define JSA1212_ALS_RNG_0_256		0x03
>>> +#define JSA1212_ALS_RNG_0_128		0x04
>>> +
>>> +/* JSA1212 INT threshold range */
>>> +#define JSA1212_ALS_TH_MIN	0x0000
>>> +#define JSA1212_ALS_TH_MAX	0x0FFF
>>> +#define JSA1212_PXS_TH_MIN	0x00
>>> +#define JSA1212_PXS_TH_MAX	0xFF
>>> +
>>> +#define JSA1212_ALS_DELAY_MS	0xC8
>>> +#define JSA1212_PXS_DELAY_MS	0x64
> Shouldn't these delays be in human-readable format? Like 200 and 100?
Agree. Will fix it.
>>> +
>>> +#define JSA1212_DRIVER_NAME	"jsa1212"
>>> +#define JSA1212_REGMAP_NAME	"jsa1212_regmap"
>>> +
>>> +enum jsa1212_op_mode {
>>> +	JSA1212_OPMODE_ALS_EN,
>>> +	JSA1212_OPMODE_PXS_EN,
>>> +};
>>> +
>>> +struct jsa1212_data {
>>> +	struct i2c_client *client;
>>> +	struct mutex lock;
>>> +	u8 als_rng_idx;
>>> +	bool als_en; /* ALS enable status */
>>> +	bool pxs_en; /* proximity enable status */
>>> +	struct regmap *regmap;
>>> +};
>>> +
>>> +/* ALS range idx to val mapping */
>>> +static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
>>> +						128, 128, 128};
>>> +
>>> +/* Enables or disables ALS function based on status */
>>> +static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
>>> +{
>>> +	int ret;
>>> +
>>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>>> +				JSA1212_CONF_ALS_MASK,
>>> +				status);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	data->als_en = status ? true : false;
> data->als_en = !!status;
I thought above statement is more explicit and simple. But if its not 
preferred , I will change it in next version.
>>> +
>>> +	return ret;
> Just return 0; to indicate successful termination.
>>> +}
>>> +
>>> +/* Enables or disables PXS function based on status */
>>> +static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
>>> +{
>>> +	int ret;
>>> +
>>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>>> +				JSA1212_CONF_PXS_MASK,
>>> +				status);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	data->pxs_en = status ? true : false;
>>> +
>>> +	return ret;
> Same applies here.
same as above.
>>> +}
>>> +
>>> +static int jsa1212_read_als_data(struct jsa1212_data *data,
>>> +				unsigned int *val)
>>> +{
>>> +	int ret;
>>> +	u8 als_data[2];
>> __le16 als_data;
>>
>> should make the conversion below simpler: *val = le16_to_cpu(als_data);
>>
>>> +
>>> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	/* Delay for data output */
>>> +	msleep(JSA1212_ALS_DELAY_MS);
>>> +
>>> +	/* Read 12 bit data */
>>> +	ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, als_data, 2);
>>> +	if (ret < 0) {
>>> +		dev_err(&data->client->dev, "als data read err\n");
>>> +		goto als_data_read_err;
>>> +	}
>>> +
>>> +	*val = le16_to_cpup((__le16 *)als_data);
>>> +
>>> +als_data_read_err:
>>> +	ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
>> simply
>> return jsa1212_als_enable(..)
>>
>> drop lines below
>>
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int jsa1212_read_pxs_data(struct jsa1212_data *data,
>>> +				unsigned int *val)
>>> +{
>>> +	int ret;
>>> +	unsigned int pxs_data;
>>> +
>>> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	/* Delay for data output */
>>> +	msleep(JSA1212_PXS_DELAY_MS);
>>> +
>>> +	/* Read out all data */
>>> +	ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
>>> +	if (ret < 0) {
>>> +		dev_err(&data->client->dev, "pxs data read err\n");
>>> +		goto pxs_data_read_err;
>>> +	}
>>> +
>>> +	*val = pxs_data & JSA1212_PXS_DATA_MASK;
>>> +
>>> +pxs_data_read_err:
>> simply
>> return jsa1212_als_enable(..)
>>
>> drop lines below
>>
>>> +	ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int jsa1212_read_raw(struct iio_dev *indio_dev,
>>> +				struct iio_chan_spec const *chan,
>>> +				int *val, int *val2, long mask)
>>> +{
>>> +	int ret;
>>> +	struct jsa1212_data *data = iio_priv(indio_dev);
>>> +
>>> +	switch (mask) {
>>> +	case IIO_CHAN_INFO_RAW:
>>> +		mutex_lock(&data->lock);
>>> +		switch (chan->type) {
>>> +		case IIO_LIGHT:
>>> +			ret = jsa1212_read_als_data(data, val);
>>> +			break;
>>> +		case IIO_PROXIMITY:
>>> +			ret = jsa1212_read_pxs_data(data, val);
>>> +			break;
>>> +		default:
>>> +			ret = -EINVAL;
>>> +			break;
>>> +		}
>>> +		ret = ret < 0 ? ret : IIO_VAL_INT;
>>> +		mutex_unlock(&data->lock);
>> could move mutex_unlock() one line up
> And return ret or IIO_VAL_INT directly here, making the break below obsolete.
Will change it.
>>> +		break;
>>> +	case IIO_CHAN_INFO_SCALE:
>>> +		switch (chan->type) {
>>> +		case IIO_LIGHT:
>>> +			*val = jsa1212_als_range_val[data->als_rng_idx];
>>> +			*val2 = BIT(12); /* Max 12 bit value */
>>> +			ret = IIO_VAL_FRACTIONAL;
> Better: define JSA1212_ALS_RESOLUTION and use it here for *val2. Then just return IIO_VAL_FRACTIONAL_LOG2.
> You can also drop the following lines or keep the default sections empty and just return -EINVAL at the end.
>>> +			break;
>>> +		default:
>>> +			ret = -EINVAL;
>>> +			break;
>>> +		}
>>> +		break;
>>> +	default:
>>> +		ret = -EINVAL;
>>> +		break;
>>> +	}
>>> +
>>> +	return ret;
>>> +}
>>> +
>>> +static const struct iio_chan_spec jsa1212_channels[] = {
>>> +	{
>>> +		.type = IIO_LIGHT,
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>>> +			BIT(IIO_CHAN_INFO_SCALE),
>>> +	},
>>> +	{
>>> +		.type = IIO_PROXIMITY,
>>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>>> +	}
>>> +};
>>> +
>>> +static const struct iio_info jsa1212_info = {
>>> +	.driver_module		= THIS_MODULE,
>>> +	.read_raw		= &jsa1212_read_raw,
>>> +};
>>> +
>>> +static int jsa1212_chip_init(struct jsa1212_data *data)
>>> +{
>>> +	int ret;
>>> +
>>> +	ret = regmap_write(data->regmap, JSA1212_CONF_REG,
>>> +				(JSA1212_CONF_PXS_SLP_50MS |
>>> +				JSA1212_CONF_IRDR_ENABLE));
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	ret = regmap_write(data->regmap, JSA1212_INT_REG,
>>> +				JSA1212_INT_ALS_PRST_4CONV);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
>> should the range setting be written to the chip?
>>
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
> Why pass *dev?
Its a default function argument of callback function.
>>> +{
>>> +	switch (reg) {
>>> +	case JSA1212_PXS_DATA_REG:
>>> +	case JSA1212_ALS_DT1_REG:
>>> +	case JSA1212_ALS_DT2_REG:
>>> +	case JSA1212_INT_REG:
>>> +		return true;
>>> +	default:
>>> +		return false;
>>> +	}
>>> +}
>>> +
>>> +static struct regmap_config jsa1212_regmap_config = {
>>> +	.name =  JSA1212_REGMAP_NAME,
>>> +	.reg_bits = 8,
>>> +	.val_bits = 8,
>>> +	.max_register = JSA1212_MAX_REG,
>>> +	.cache_type = REGCACHE_RBTREE,
>>> +	.volatile_reg = jsa1212_is_volatile_reg,
>>> +};
>>> +
>>> +static int jsa1212_probe(struct i2c_client *client,
>>> +			     const struct i2c_device_id *id)
> Adjust indentation of second line of parameters to the left.
Will fix it.
>>> +{
>>> +	struct jsa1212_data *jsa1212_data;
> I think you should not name the instance of a variable the sames as its type.
Will change it to data.
>>> +	struct iio_dev *indio_dev;
>>> +	struct regmap *regmap;
>>> +	int ret;
>>> +
>>> +	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
>>> +		return -ENODEV;
>>> +
>>> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*jsa1212_data));
>>> +	if (!indio_dev)
>>> +		return -ENOMEM;
>>> +
>>> +	regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
>>> +	if (IS_ERR(regmap)) {
>>> +		dev_err(&client->dev, "Regmap initialization failed.\n");
>>> +		return PTR_ERR(regmap);
>>> +	}
>>> +
>>> +	jsa1212_data = iio_priv(indio_dev);
>>> +
>>> +	i2c_set_clientdata(client, indio_dev);
>>> +	jsa1212_data->client = client;
>>> +	jsa1212_data->regmap = regmap;
>>> +
>>> +	mutex_init(&jsa1212_data->lock);
>>> +
>>> +	ret = jsa1212_chip_init(jsa1212_data);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	indio_dev->dev.parent = &client->dev;
>>> +	indio_dev->channels = jsa1212_channels;
>>> +	indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
>>> +	indio_dev->name = JSA1212_DRIVER_NAME;
>>> +	indio_dev->modes = INDIO_DIRECT_MODE;
>>> +
>>> +	indio_dev->info = &jsa1212_info;
>>> +
>>> +	ret = iio_device_register(indio_dev);
>>> +	if (ret < 0) {
>>> +		dev_err(&client->dev, "%s: register device failed\n", __func__);
>>> +		return ret;
>>> +	}
> Or just
> 	if (ret < 0)
> 		dev_err(...);
> 	return ret;
> And what about setting JSA1212_CONF_IRDR_DISABLE in case iio_device_register fails? Would that leave the IR-LED on?
Actually, I have made a mistake in naming the IRDR settings. Its not an 
enable/disable flag. Its a current sink drive setting for IRDR.
I have fixed the naming issue in next version. This setting will be used 
only if proximity sensor is enabled (JSA1212_CONF_PXS_ENABLE). Since
its not enabled in chip init we don't need to disable it here.
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> + /* power off the device */
>>> +static int jsa1212_power_off(struct jsa1212_data *data)
>>> +{
>>> +	int ret;
>>> +
>>> +	mutex_lock(&data->lock);
>>> +
>>> +	ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
>>> +				JSA1212_CONF_ALS_MASK |
>>> +				JSA1212_CONF_PXS_MASK,
>>> +				JSA1212_CONF_ALS_DISABLE |
>>> +				JSA1212_CONF_PXS_DISABLE);
> What about JSA1212_CONF_IRDR_DISABLE?
We don't need to fix this. Please check the above explanation.
>>> +
>>> +	if (ret < 0)
>>> +		dev_err(&data->client->dev, "power off cmd failed\n");
>>> +
>>> +	mutex_unlock(&data->lock);
>>> +
>>> +	return ret;
>>> +}
>>> +
>> drop extra newline
>>
>>> +
>>> +static int jsa1212_remove(struct i2c_client *client)
>>> +{
>>> +	struct iio_dev *indio_dev = i2c_get_clientdata(client);
>>> +	struct jsa1212_data *data = iio_priv(indio_dev);
>>> +
>>> +	iio_device_unregister(indio_dev);
>>> +
>>> +	return jsa1212_power_off(data);
>>> +}
>>> +
>>> +#ifdef CONFIG_PM_SLEEP
>>> +static int jsa1212_suspend(struct device *dev)
>>> +{
>>> +	struct jsa1212_data *data;
>>> +
>>> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
>>> +
>>> +	return jsa1212_power_off(data);
>>> +}
>>> +
>>> +static int jsa1212_resume(struct device *dev)
>>> +{
>>> +	int ret = 0;
>>> +	struct jsa1212_data *data;
>>> +
>>> +	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
>>> +
>>> +	mutex_lock(&data->lock);
>>> +
>>> +	if (data->als_en) {
>>> +		ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
>>> +		if (ret < 0) {
>>> +			dev_err(dev, "als resume failed\n");
>>> +			goto unlock_and_ret;
>>> +		}
>>> +	}
>>> +
>>> +	if (data->pxs_en) {
>>> +		ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
>>> +		if (ret < 0)
>>> +			dev_err(dev, "pxs resume failed\n");
>>> +	}
>>> +
>>> +unlock_and_ret:
>>> +	mutex_unlock(&data->lock);
>>> +	return ret;
>>> +}
>>> +
>>> +static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
>>> +
>>> +#define JSA1212_PM_OPS (&jsa1212_pm_ops)
>>> +#else
>>> +#define JSA1212_PM_OPS NULL
>>> +#endif
>>> +
>>> +static const struct acpi_device_id jsa1212_acpi_match[] = {
>>> +	{"JSA1212", 0},
>>> +	{ },
>>> +};
>>> +MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
>>> +
>>> +static const struct i2c_device_id jsa1212_id[] = {
>>> +	{ JSA1212_DRIVER_NAME, 0 },
>>> +	{ }
>>> +};
>>> +MODULE_DEVICE_TABLE(i2c, jsa1212_id);
>>> +
>>> +static struct i2c_driver jsa1212_driver = {
>>> +	.driver = {
>>> +		.name	= JSA1212_DRIVER_NAME,
>>> +		.pm	= JSA1212_PM_OPS,
>>> +		.owner	= THIS_MODULE,
>>> +		.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
>>> +	},
>>> +	.probe		= jsa1212_probe,
>>> +	.remove		= jsa1212_remove,
>>> +	.id_table	= jsa1212_id,
>>> +};
>>> +module_i2c_driver(jsa1212_driver);
>>> +
>>> +MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
>>> +MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
>>> +MODULE_LICENSE("GPL v2");
>>>
>

-- 
Sathyanarayanan Kuppuswamy
Android kernel developer