[PATCH v6 0/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[PATCH v6 0/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[Eric Andersson]

This is version 6 of the driver for Bosch Sensortec's accelerometers BMA150
and SMB380.

Here is the changelog:
* community review: request ONESHOT irq.
* community review: replaced ABS_MISC event registration with EV_ABS only.
* community review: updated runtime_pm in open/close.
* community review: added units in range and bandwidth parameter description.
* community review: fixed weird spacing.
* community review: moved register address macros from h- to c-file.
* community review: changed handling of platform_data cfg settings.
* community review: replaced driver pm-struct with UNIVERSAL_DEV_PM_OPS.
* community review: empty line between variable declaration and code.
* community review: replace existing driver mutex in favor of the input mutex.
* community review: added missing __devinits and __devexit.
* Updated the default_cfg settings according to the EEPROM values.
* Removed const and added __initdata to the default_cfg struct.

--
Best regards,
 Eric

 http://www.unixphere.com

Eric Andersson (1):
  input: add driver for Bosch Sensortec's BMA150 accelerometer

 drivers/input/misc/Kconfig  |   11 +
 drivers/input/misc/Makefile |    1 +
 drivers/input/misc/bma150.c |  654 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/bma150.h      |   47 +++
 4 files changed, 713 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/misc/bma150.c
 create mode 100644 include/linux/bma150.h

-- 
1.7.3.4

[PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[Eric Andersson]

Signed-off-by: Albert Zhang <xu.zhang@bosch-sensortec.com>
Signed-off-by: Eric Andersson <eric.andersson@unixphere.com>
---
 drivers/input/misc/Kconfig  |   11 +
 drivers/input/misc/Makefile |    1 +
 drivers/input/misc/bma150.c |  654 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/bma150.h      |   47 +++
 4 files changed, 713 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/misc/bma150.c
 create mode 100644 include/linux/bma150.h

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index c9104bb..4493241 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -527,4 +527,15 @@ config INPUT_XEN_KBDDEV_FRONTEND
 	  To compile this driver as a module, choose M here: the
 	  module will be called xen-kbdfront.
 
+config INPUT_BMA150
+	tristate "BMA150/SMB380 acceleration sensor support"
+	depends on I2C
+	select INPUT_POLLDEV
+	help
+	  Say Y here if you have Bosch Sensortec's BMA150 or SMB380
+	  acceleration sensor hooked to an I2C bus.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called bma150.
+
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 299ad5e..505a398 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -49,3 +49,4 @@ obj-$(CONFIG_INPUT_WISTRON_BTNS)	+= wistron_btns.o
 obj-$(CONFIG_INPUT_WM831X_ON)		+= wm831x-on.o
 obj-$(CONFIG_INPUT_XEN_KBDDEV_FRONTEND)	+= xen-kbdfront.o
 obj-$(CONFIG_INPUT_YEALINK)		+= yealink.o
+obj-$(CONFIG_INPUT_BMA150)		+= bma150.o
diff --git a/drivers/input/misc/bma150.c b/drivers/input/misc/bma150.c
new file mode 100644
index 0000000..4789ff6
--- /dev/null
+++ b/drivers/input/misc/bma150.c
@@ -0,0 +1,654 @@
+/*
+ * Copyright (c) 2011 Bosch Sensortec GmbH
+ * Copyright (c) 2011 Unixphere
+ *
+ * This driver adds support for Bosch Sensortec's digital acceleration
+ * sensors BMA150 and SMB380.
+ * The SMB380 is fully compatible with BMA150 and only differs in packaging.
+ *
+ * The datasheet for the BMA150 chip can be found here:
+ * http://www.bosch-sensortec.com/content/language1/downloads/BST-BMA150-DS000-07.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input-polldev.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/bma150.h>
+
+#define ABSMAX_ACC_VAL		0x01FF
+#define ABSMIN_ACC_VAL		-(ABSMAX_ACC_VAL)
+
+/* Each axis is represented by a 2-byte data word */
+#define BMA150_XYZ_DATA_SIZE	6
+
+/* Input poll interval in milliseconds */
+#define BMA150_POLL_INTERVAL	10
+#define BMA150_POLL_MAX		200
+#define BMA150_POLL_MIN		0
+
+#define BMA150_BW_25HZ		0
+#define BMA150_BW_50HZ		1
+#define BMA150_BW_100HZ		2
+#define BMA150_BW_190HZ		3
+#define BMA150_BW_375HZ		4
+#define BMA150_BW_750HZ		5
+#define BMA150_BW_1500HZ	6
+
+#define BMA150_RANGE_2G		0
+#define BMA150_RANGE_4G		1
+#define BMA150_RANGE_8G		2
+
+#define BMA150_MODE_NORMAL	0
+#define BMA150_MODE_SLEEP	2
+#define BMA150_MODE_WAKE_UP	3
+
+/* Data register addresses */
+#define BMA150_DATA_0_REG	0x00
+#define BMA150_DATA_1_REG	0x01
+#define BMA150_DATA_2_REG	0x02
+
+/* Control register addresses */
+#define BMA150_CTRL_0_REG	0x0A
+#define BMA150_CTRL_1_REG	0x0B
+#define BMA150_CTRL_2_REG	0x14
+#define BMA150_CTRL_3_REG	0x15
+
+/* Configuration/Setting register addresses */
+#define BMA150_CFG_0_REG	0x0C
+#define BMA150_CFG_1_REG	0x0D
+#define BMA150_CFG_2_REG	0x0E
+#define BMA150_CFG_3_REG	0x0F
+#define BMA150_CFG_4_REG	0x10
+#define BMA150_CFG_5_REG	0x11
+
+#define BMA150_CHIP_ID		2
+#define BMA150_CHIP_ID_REG	BMA150_DATA_0_REG
+
+#define BMA150_ACC_X_LSB_REG	BMA150_DATA_2_REG
+
+#define BMA150_SLEEP_POS	0
+#define BMA150_SLEEP_MSK	0x01
+#define BMA150_SLEEP_REG	BMA150_CTRL_0_REG
+
+#define BMA150_BANDWIDTH_POS	0
+#define BMA150_BANDWIDTH_MSK	0x07
+#define BMA150_BANDWIDTH_REG	BMA150_CTRL_2_REG
+
+#define BMA150_RANGE_POS	3
+#define BMA150_RANGE_MSK	0x18
+#define BMA150_RANGE_REG	BMA150_CTRL_2_REG
+
+#define BMA150_WAKE_UP_POS	0
+#define BMA150_WAKE_UP_MSK	0x01
+#define BMA150_WAKE_UP_REG	BMA150_CTRL_3_REG
+
+#define BMA150_SW_RES_POS	1
+#define BMA150_SW_RES_MSK	0x02
+#define BMA150_SW_RES_REG	BMA150_CTRL_0_REG
+
+/* Any-motion interrupt register fields */
+#define BMA150_ANY_MOTION_EN_POS	6
+#define BMA150_ANY_MOTION_EN_MSK	0x40
+#define BMA150_ANY_MOTION_EN_REG	BMA150_CTRL_1_REG
+
+#define BMA150_ANY_MOTION_DUR_POS	6
+#define BMA150_ANY_MOTION_DUR_MSK	0xC0
+#define BMA150_ANY_MOTION_DUR_REG	BMA150_CFG_5_REG
+
+#define BMA150_ANY_MOTION_THRES_REG	BMA150_CFG_4_REG
+
+/* Advanced interrupt register fields */
+#define BMA150_ADV_INT_EN_POS		6
+#define BMA150_ADV_INT_EN_MSK		0x40
+#define BMA150_ADV_INT_EN_REG		BMA150_CTRL_3_REG
+
+/* High-G interrupt register fields */
+#define BMA150_HIGH_G_EN_POS		1
+#define BMA150_HIGH_G_EN_MSK		0x02
+#define BMA150_HIGH_G_EN_REG		BMA150_CTRL_1_REG
+
+#define BMA150_HIGH_G_HYST_POS		3
+#define BMA150_HIGH_G_HYST_MSK		0x38
+#define BMA150_HIGH_G_HYST_REG		BMA150_CFG_5_REG
+
+#define BMA150_HIGH_G_DUR_REG		BMA150_CFG_3_REG
+#define BMA150_HIGH_G_THRES_REG		BMA150_CFG_2_REG
+
+/* Low-G interrupt register fields */
+#define BMA150_LOW_G_EN_POS		0
+#define BMA150_LOW_G_EN_MSK		0x01
+#define BMA150_LOW_G_EN_REG		BMA150_CTRL_1_REG
+
+#define BMA150_LOW_G_HYST_POS		0
+#define BMA150_LOW_G_HYST_MSK		0x07
+#define BMA150_LOW_G_HYST_REG		BMA150_CFG_5_REG
+
+#define BMA150_LOW_G_DUR_REG		BMA150_CFG_1_REG
+#define BMA150_LOW_G_THRES_REG		BMA150_CFG_0_REG
+
+struct bma150_data {
+	struct i2c_client *client;
+	struct input_polled_dev *input_polled;
+	struct input_dev *input;
+};
+
+/*
+ * The settings for the given range, bandwidth and interrupt features
+ * are stated and verified by Bosch Sensortec where they are configured
+ * to provide a generic sensitivity performance.
+ */
+static struct bma150_cfg default_cfg __initdata = {
+	.any_motion_int = 1,
+	.hg_int = 1,
+	.lg_int = 1,
+	.any_motion_dur = 0,
+	.any_motion_thres = 0,
+	.hg_hyst = 0,
+	.hg_dur = 150,
+	.hg_thres = 160,
+	.lg_hyst = 0,
+	.lg_dur = 150,
+	.lg_thres = 20,
+	.range = BMA150_RANGE_2G,
+	.bandwidth = BMA150_BW_50HZ
+};
+
+static int bma150_write_byte(struct i2c_client *client, u8 reg, u8 val)
+{
+	s32 ret;
+
+	/* As per specification, disable irq in between register writes */
+	if (client->irq)
+		disable_irq_nosync(client->irq);
+
+	ret = i2c_smbus_write_byte_data(client, reg, val);
+
+	if (client->irq)
+		enable_irq(client->irq);
+	return ret;
+}
+
+static int bma150_set_reg_bits(struct i2c_client *client,
+					int val, int shift, u8 mask, u8 reg)
+{
+	int data = i2c_smbus_read_byte_data(client, reg);
+
+	if (data < 0)
+		return data;
+
+	data = (data & ~mask) | ((val << shift) & mask);
+	return bma150_write_byte(client, reg, data);
+}
+
+static int bma150_set_mode(struct i2c_client *client, u8 mode)
+{
+	s32 ret;
+
+	ret = bma150_set_reg_bits(client, mode, BMA150_WAKE_UP_POS,
+				BMA150_WAKE_UP_MSK, BMA150_WAKE_UP_REG);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_set_reg_bits(client, mode, BMA150_SLEEP_POS,
+				BMA150_SLEEP_MSK, BMA150_SLEEP_REG);
+	if (ret < 0)
+		return ret;
+
+	if (mode == BMA150_MODE_NORMAL)
+		msleep(2);
+	return ret;
+}
+
+static int __devinit bma150_soft_reset(struct i2c_client *client)
+{
+	s32 ret;
+
+	ret = bma150_set_reg_bits(client, 1, BMA150_SW_RES_POS,
+			BMA150_SW_RES_MSK, BMA150_SW_RES_REG);
+	msleep(2);
+	return ret;
+}
+
+static int __devinit bma150_set_range(struct i2c_client *client, u8 range)
+{
+	s32 ret;
+
+	ret = bma150_set_reg_bits(client, range, BMA150_RANGE_POS,
+				BMA150_RANGE_MSK, BMA150_RANGE_REG);
+	return ret;
+}
+
+static int __devinit bma150_set_bandwidth(struct i2c_client *client, u8 bw)
+{
+	s32 ret;
+
+	ret = bma150_set_reg_bits(client, bw, BMA150_BANDWIDTH_POS,
+				BMA150_BANDWIDTH_MSK, BMA150_BANDWIDTH_REG);
+	return ret;
+}
+
+static int __devinit bma150_set_low_g_interrupt(struct i2c_client *client,
+					u8 enable, u8 hyst, u8 dur, u8 thres)
+{
+	s32 ret;
+	struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+	ret = bma150_set_reg_bits(bma150->client, hyst,
+				BMA150_LOW_G_HYST_POS, BMA150_LOW_G_HYST_MSK,
+				BMA150_LOW_G_HYST_REG);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_write_byte(bma150->client,	BMA150_LOW_G_DUR_REG, dur);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_write_byte(bma150->client,	BMA150_LOW_G_THRES_REG, thres);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_set_reg_bits(bma150->client, !!enable,
+				BMA150_LOW_G_EN_POS, BMA150_LOW_G_EN_MSK,
+				BMA150_LOW_G_EN_REG);
+	return ret;
+}
+
+static int __devinit bma150_set_high_g_interrupt(struct i2c_client *client,
+					u8 enable, u8 hyst, u8 dur, u8 thres)
+{
+	s32 ret;
+	struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+	ret = bma150_set_reg_bits(bma150->client, hyst,
+				BMA150_HIGH_G_HYST_POS, BMA150_HIGH_G_HYST_MSK,
+				BMA150_HIGH_G_HYST_REG);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_write_byte(bma150->client,	BMA150_HIGH_G_DUR_REG, dur);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_write_byte(bma150->client,	BMA150_HIGH_G_THRES_REG, thres);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_set_reg_bits(bma150->client, !!enable,
+				BMA150_HIGH_G_EN_POS, BMA150_HIGH_G_EN_MSK,
+				BMA150_HIGH_G_EN_REG);
+	return ret;
+}
+
+
+static int __devinit bma150_set_any_motion_interrupt(struct i2c_client *client,
+						u8 enable, u8 dur, u8 thres)
+{
+	s32 ret;
+	struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+	ret = bma150_set_reg_bits(bma150->client, dur,
+				BMA150_ANY_MOTION_DUR_POS,
+				BMA150_ANY_MOTION_DUR_MSK,
+				BMA150_ANY_MOTION_DUR_REG);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_write_byte(bma150->client,
+				BMA150_ANY_MOTION_THRES_REG, thres);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_set_reg_bits(bma150->client, !!enable,
+				BMA150_ADV_INT_EN_POS, BMA150_ADV_INT_EN_MSK,
+				BMA150_ADV_INT_EN_REG);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_set_reg_bits(bma150->client, !!enable,
+				BMA150_ANY_MOTION_EN_POS,
+				BMA150_ANY_MOTION_EN_MSK,
+				BMA150_ANY_MOTION_EN_REG);
+	return ret;
+}
+
+static void bma150_report_xyz(struct bma150_data *bma150)
+{
+	u8 data[BMA150_XYZ_DATA_SIZE];
+	s16 x, y, z;
+	s32 ret;
+
+	ret = i2c_smbus_read_i2c_block_data(bma150->client,
+			BMA150_ACC_X_LSB_REG, BMA150_XYZ_DATA_SIZE, data);
+	if (ret != BMA150_XYZ_DATA_SIZE)
+		return;
+
+	x = ((0xc0 & data[0]) >> 6) | (data[1] << 2);
+	y = ((0xc0 & data[2]) >> 6) | (data[3] << 2);
+	z = ((0xc0 & data[4]) >> 6) | (data[5] << 2);
+
+	/* sign extension */
+	x = (s16) (x << 6) >> 6;
+	y = (s16) (y << 6) >> 6;
+	z = (s16) (z << 6) >> 6;
+
+	input_report_abs(bma150->input, ABS_X, x);
+	input_report_abs(bma150->input, ABS_Y, y);
+	input_report_abs(bma150->input, ABS_Z, z);
+	input_sync(bma150->input);
+}
+
+static irqreturn_t bma150_irq_thread(int irq, void *dev)
+{
+	bma150_report_xyz(dev);
+	return IRQ_HANDLED;
+}
+
+static void bma150_poll(struct input_polled_dev *dev)
+{
+	bma150_report_xyz(dev->private);
+}
+
+static int bma150_open(struct bma150_data *bma150)
+{
+	int ret;
+
+	ret = pm_runtime_set_active(&bma150->client->dev);
+	if (ret < 0)
+		return ret;
+
+	pm_runtime_enable(&bma150->client->dev);
+
+	return bma150_set_mode(bma150->client, BMA150_MODE_NORMAL);
+}
+
+static void bma150_close(struct bma150_data *bma150)
+{
+	pm_runtime_disable(&bma150->client->dev);
+	pm_runtime_set_suspended(&bma150->client->dev);
+	bma150_set_mode(bma150->client, BMA150_MODE_SLEEP);
+}
+
+static int bma150_irq_open(struct input_dev *input)
+{
+	struct bma150_data *bma150 = input_get_drvdata(input);
+
+	return bma150_open(bma150);
+}
+
+static void bma150_irq_close(struct input_dev *input)
+{
+	struct bma150_data *bma150 = input_get_drvdata(input);
+
+	bma150_close(bma150);
+}
+
+static void bma150_poll_open(struct input_polled_dev *ipoll_dev)
+{
+	struct bma150_data *bma150 = ipoll_dev->private;
+
+	bma150_open(bma150);
+}
+
+static void bma150_poll_close(struct input_polled_dev *ipoll_dev)
+{
+	struct bma150_data *bma150 = ipoll_dev->private;
+
+	bma150_close(bma150);
+}
+
+static void bma150_free_input_device(struct bma150_data *bma150)
+{
+	if (bma150->client->irq > 0)
+		input_unregister_device(bma150->input);
+	else
+		input_unregister_polled_device(bma150->input_polled);
+}
+
+static int __devinit bma150_initialize(struct i2c_client *client,
+				       struct bma150_cfg *cfg)
+{
+	s32 ret;
+
+	ret = bma150_soft_reset(client);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_set_bandwidth(client, cfg->bandwidth);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_set_range(client, cfg->range);
+	if (ret < 0)
+		return ret;
+
+	if (!client->irq)
+		goto exit;
+
+	ret = bma150_set_any_motion_interrupt(client, cfg->any_motion_int,
+			cfg->any_motion_dur, cfg->any_motion_thres);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_set_high_g_interrupt(client, cfg->hg_int,
+			cfg->hg_hyst, cfg->hg_dur, cfg->hg_thres);
+	if (ret < 0)
+		return ret;
+
+	ret = bma150_set_low_g_interrupt(client, cfg->lg_int,
+			cfg->lg_hyst, cfg->lg_dur, cfg->lg_thres);
+	if (ret < 0)
+		return ret;
+exit:
+	ret = bma150_set_mode(client, BMA150_MODE_SLEEP);
+	return ret;
+}
+
+static int __devinit bma150_setup_input_device(struct bma150_data *bma150)
+{
+	struct input_polled_dev *ipoll_dev;
+	struct input_dev *idev;
+	int ret;
+
+	if (bma150->client->irq > 0) {
+		idev = input_allocate_device();
+		if (!idev)
+			return -ENOMEM;
+		idev->open = bma150_irq_open;
+		idev->close = bma150_irq_close;
+		input_set_drvdata(idev, bma150);
+	} else {
+		ipoll_dev = input_allocate_polled_device();
+		if (!ipoll_dev)
+			return -ENOMEM;
+		ipoll_dev->private = bma150;
+		ipoll_dev->open = bma150_poll_open;
+		ipoll_dev->close = bma150_poll_close;
+		ipoll_dev->poll = bma150_poll;
+		ipoll_dev->poll_interval = BMA150_POLL_INTERVAL;
+		ipoll_dev->poll_interval_min = BMA150_POLL_MIN;
+		ipoll_dev->poll_interval_max = BMA150_POLL_MAX;
+
+		idev = ipoll_dev->input;
+	}
+
+	idev->name = BMA150_DRIVER;
+	idev->phys = BMA150_DRIVER "/input0";
+	idev->id.bustype = BUS_I2C;
+	idev->dev.parent = &bma150->client->dev;
+
+	idev->evbit[0] = BIT_MASK(EV_ABS);
+	input_set_abs_params(idev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+	input_set_abs_params(idev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+	input_set_abs_params(idev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+
+	if (bma150->client->irq > 0) {
+		ret = input_register_device(idev);
+		if (ret < 0) {
+			input_free_device(idev);
+			return ret;
+		}
+		ret = request_threaded_irq(bma150->client->irq, NULL,
+			bma150_irq_thread, IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+			BMA150_DRIVER, bma150);
+		if (ret < 0) {
+			dev_err(&bma150->client->dev,
+				"irq request failed %d, ret %d\n",
+				bma150->client->irq, ret);
+			goto error_irq;
+		}
+	} else {
+		ret = input_register_polled_device(ipoll_dev);
+		if (ret < 0) {
+			input_free_polled_device(ipoll_dev);
+			return ret;
+		}
+		bma150->input_polled = ipoll_dev;
+	}
+	bma150->input = idev;
+	return ret;
+
+error_irq:
+	bma150_free_input_device(bma150);
+	return ret;
+}
+
+static int __devinit bma150_probe(struct i2c_client *client,
+				  const struct i2c_device_id *id)
+{
+	struct bma150_cfg *cfg;
+	struct bma150_data *bma150;
+	struct bma150_platform_data *pdata;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "i2c_check_functionality error\n");
+		return -EIO;
+	}
+
+	ret = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
+	if (ret != BMA150_CHIP_ID) {
+		dev_err(&client->dev, "BMA150 chip id error: %d\n", ret);
+		return -EINVAL;
+	}
+
+	bma150 = kzalloc(sizeof(struct bma150_data), GFP_KERNEL);
+	if (!bma150)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, bma150);
+	bma150->client = client;
+
+	pdata = client->dev.platform_data;
+	if (pdata) {
+		if (pdata->irq_gpio_cfg && (pdata->irq_gpio_cfg() < 0)) {
+			dev_err(&client->dev,
+				"IRQ GPIO conf. error %d, ret %d\n",
+				client->irq, ret);
+			goto kfree_exit;
+		}
+		cfg = &pdata->cfg;
+	} else {
+		cfg = &default_cfg;
+	}
+	ret = bma150_initialize(client, cfg);
+	if (ret < 0)
+		goto kfree_exit;
+
+	ret = bma150_setup_input_device(bma150);
+	if (ret < 0)
+		goto kfree_exit;
+
+	dev_info(&client->dev, "Registered BMA150 I2C driver\n");
+	return 0;
+
+kfree_exit:
+	kfree(bma150);
+	return ret;
+}
+
+#if defined(CONFIG_PM) || defined(CONFIG_PM_RUNTIME)
+static int bma150_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return bma150_set_mode(client, BMA150_MODE_SLEEP);
+}
+
+static int bma150_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return bma150_set_mode(client, BMA150_MODE_NORMAL);
+}
+#endif
+
+static int __devexit bma150_remove(struct i2c_client *client)
+{
+	struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+	pm_runtime_disable(&bma150->client->dev);
+	bma150_free_input_device(bma150);
+	kfree(bma150);
+	return 0;
+}
+
+static UNIVERSAL_DEV_PM_OPS(bma150_pm, bma150_suspend, bma150_resume, NULL);
+
+static const struct i2c_device_id bma150_id[] = {
+	{ "bma150", 0 },
+	{ "smb380", 0 },
+	{ "bma023", 0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, bma150_id);
+
+static struct i2c_driver bma150_driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= BMA150_DRIVER,
+		.pm	= &bma150_pm,
+	},
+	.class          = I2C_CLASS_HWMON,
+	.id_table	= bma150_id,
+	.probe		= bma150_probe,
+	.remove		= __devexit_p(bma150_remove),
+};
+
+static int __init BMA150_init(void)
+{
+	return i2c_add_driver(&bma150_driver);
+}
+
+static void __exit BMA150_exit(void)
+{
+	i2c_del_driver(&bma150_driver);
+}
+
+MODULE_AUTHOR("Albert Zhang <xu.zhang@bosch-sensortec.com>");
+MODULE_DESCRIPTION("BMA150 driver");
+MODULE_LICENSE("GPL");
+
+module_init(BMA150_init);
+module_exit(BMA150_exit);
+
diff --git a/include/linux/bma150.h b/include/linux/bma150.h
new file mode 100644
index 0000000..7a8bbce
--- /dev/null
+++ b/include/linux/bma150.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2011 Bosch Sensortec GmbH
+ * Copyright (c) 2011 Unixphere
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _BMA150_H_
+#define _BMA150_H_
+
+#define BMA150_DRIVER		"bma150"
+
+struct bma150_cfg {
+	bool any_motion_int;		/* Set to enable any-motion interrupt */
+	bool hg_int;			/* Set to enable high-G interrupt */
+	bool lg_int;			/* Set to enable low-G interrupt */
+	unsigned char any_motion_dur;	/* Any-motion duration */
+	unsigned char any_motion_thres;	/* Any-motion threshold */
+	unsigned char hg_hyst;		/* High-G hysterisis */
+	unsigned char hg_dur;		/* High-G duration */
+	unsigned char hg_thres;		/* High-G threshold */
+	unsigned char lg_hyst;		/* Low-G hysterisis */
+	unsigned char lg_dur;		/* Low-G duration */
+	unsigned char lg_thres;		/* Low-G threshold */
+	unsigned char range;		/* BMA0150_RANGE_xxx (in G) */
+	unsigned char bandwidth;	/* BMA0150_BW_xxx (in Hz) */
+};
+
+struct bma150_platform_data {
+	struct bma150_cfg cfg;
+	int (*irq_gpio_cfg)(void);
+};
+
+#endif /* _BMA150_H_ */
+
-- 
1.7.3.4

Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[Jonathan Cameron]

Looks good.
> Signed-off-by: Albert Zhang <xu.zhang@bosch-sensortec.com>
> Signed-off-by: Eric Andersson <eric.andersson@unixphere.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
> ---
>  drivers/input/misc/Kconfig  |   11 +
>  drivers/input/misc/Makefile |    1 +
>  drivers/input/misc/bma150.c |  654 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/bma150.h      |   47 +++
>  4 files changed, 713 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/input/misc/bma150.c
>  create mode 100644 include/linux/bma150.h
> 
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index c9104bb..4493241 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -527,4 +527,15 @@ config INPUT_XEN_KBDDEV_FRONTEND
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called xen-kbdfront.
>  
> +config INPUT_BMA150
> +	tristate "BMA150/SMB380 acceleration sensor support"
> +	depends on I2C
> +	select INPUT_POLLDEV
> +	help
> +	  Say Y here if you have Bosch Sensortec's BMA150 or SMB380
> +	  acceleration sensor hooked to an I2C bus.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called bma150.
> +
>  endif
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 299ad5e..505a398 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -49,3 +49,4 @@ obj-$(CONFIG_INPUT_WISTRON_BTNS)	+= wistron_btns.o
>  obj-$(CONFIG_INPUT_WM831X_ON)		+= wm831x-on.o
>  obj-$(CONFIG_INPUT_XEN_KBDDEV_FRONTEND)	+= xen-kbdfront.o
>  obj-$(CONFIG_INPUT_YEALINK)		+= yealink.o
> +obj-$(CONFIG_INPUT_BMA150)		+= bma150.o
> diff --git a/drivers/input/misc/bma150.c b/drivers/input/misc/bma150.c
> new file mode 100644
> index 0000000..4789ff6
> --- /dev/null
> +++ b/drivers/input/misc/bma150.c
> @@ -0,0 +1,654 @@
> +/*
> + * Copyright (c) 2011 Bosch Sensortec GmbH
> + * Copyright (c) 2011 Unixphere
> + *
> + * This driver adds support for Bosch Sensortec's digital acceleration
> + * sensors BMA150 and SMB380.
> + * The SMB380 is fully compatible with BMA150 and only differs in packaging.
> + *
> + * The datasheet for the BMA150 chip can be found here:
> + * http://www.bosch-sensortec.com/content/language1/downloads/BST-BMA150-DS000-07.pdf
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/input.h>
> +#include <linux/input-polldev.h>
> +#include <linux/interrupt.h>
> +#include <linux/delay.h>
> +#include <linux/slab.h>
> +#include <linux/pm.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/bma150.h>
> +
> +#define ABSMAX_ACC_VAL		0x01FF
> +#define ABSMIN_ACC_VAL		-(ABSMAX_ACC_VAL)
> +
> +/* Each axis is represented by a 2-byte data word */
> +#define BMA150_XYZ_DATA_SIZE	6
> +
> +/* Input poll interval in milliseconds */
> +#define BMA150_POLL_INTERVAL	10
> +#define BMA150_POLL_MAX		200
> +#define BMA150_POLL_MIN		0
> +
> +#define BMA150_BW_25HZ		0
> +#define BMA150_BW_50HZ		1
> +#define BMA150_BW_100HZ		2
> +#define BMA150_BW_190HZ		3
> +#define BMA150_BW_375HZ		4
> +#define BMA150_BW_750HZ		5
> +#define BMA150_BW_1500HZ	6
> +
> +#define BMA150_RANGE_2G		0
> +#define BMA150_RANGE_4G		1
> +#define BMA150_RANGE_8G		2
> +
> +#define BMA150_MODE_NORMAL	0
> +#define BMA150_MODE_SLEEP	2
> +#define BMA150_MODE_WAKE_UP	3
> +
> +/* Data register addresses */
> +#define BMA150_DATA_0_REG	0x00
> +#define BMA150_DATA_1_REG	0x01
> +#define BMA150_DATA_2_REG	0x02
> +
> +/* Control register addresses */
> +#define BMA150_CTRL_0_REG	0x0A
> +#define BMA150_CTRL_1_REG	0x0B
> +#define BMA150_CTRL_2_REG	0x14
> +#define BMA150_CTRL_3_REG	0x15
> +
> +/* Configuration/Setting register addresses */
> +#define BMA150_CFG_0_REG	0x0C
> +#define BMA150_CFG_1_REG	0x0D
> +#define BMA150_CFG_2_REG	0x0E
> +#define BMA150_CFG_3_REG	0x0F
> +#define BMA150_CFG_4_REG	0x10
> +#define BMA150_CFG_5_REG	0x11
> +
> +#define BMA150_CHIP_ID		2
> +#define BMA150_CHIP_ID_REG	BMA150_DATA_0_REG
> +
> +#define BMA150_ACC_X_LSB_REG	BMA150_DATA_2_REG
> +
> +#define BMA150_SLEEP_POS	0
> +#define BMA150_SLEEP_MSK	0x01
> +#define BMA150_SLEEP_REG	BMA150_CTRL_0_REG
> +
> +#define BMA150_BANDWIDTH_POS	0
> +#define BMA150_BANDWIDTH_MSK	0x07
> +#define BMA150_BANDWIDTH_REG	BMA150_CTRL_2_REG
> +
> +#define BMA150_RANGE_POS	3
> +#define BMA150_RANGE_MSK	0x18
> +#define BMA150_RANGE_REG	BMA150_CTRL_2_REG
> +
> +#define BMA150_WAKE_UP_POS	0
> +#define BMA150_WAKE_UP_MSK	0x01
> +#define BMA150_WAKE_UP_REG	BMA150_CTRL_3_REG
> +
> +#define BMA150_SW_RES_POS	1
> +#define BMA150_SW_RES_MSK	0x02
> +#define BMA150_SW_RES_REG	BMA150_CTRL_0_REG
> +
> +/* Any-motion interrupt register fields */
> +#define BMA150_ANY_MOTION_EN_POS	6
> +#define BMA150_ANY_MOTION_EN_MSK	0x40
> +#define BMA150_ANY_MOTION_EN_REG	BMA150_CTRL_1_REG
> +
> +#define BMA150_ANY_MOTION_DUR_POS	6
> +#define BMA150_ANY_MOTION_DUR_MSK	0xC0
> +#define BMA150_ANY_MOTION_DUR_REG	BMA150_CFG_5_REG
> +
> +#define BMA150_ANY_MOTION_THRES_REG	BMA150_CFG_4_REG
> +
> +/* Advanced interrupt register fields */
> +#define BMA150_ADV_INT_EN_POS		6
> +#define BMA150_ADV_INT_EN_MSK		0x40
> +#define BMA150_ADV_INT_EN_REG		BMA150_CTRL_3_REG
> +
> +/* High-G interrupt register fields */
> +#define BMA150_HIGH_G_EN_POS		1
> +#define BMA150_HIGH_G_EN_MSK		0x02
> +#define BMA150_HIGH_G_EN_REG		BMA150_CTRL_1_REG
> +
> +#define BMA150_HIGH_G_HYST_POS		3
> +#define BMA150_HIGH_G_HYST_MSK		0x38
> +#define BMA150_HIGH_G_HYST_REG		BMA150_CFG_5_REG
> +
> +#define BMA150_HIGH_G_DUR_REG		BMA150_CFG_3_REG
> +#define BMA150_HIGH_G_THRES_REG		BMA150_CFG_2_REG
> +
> +/* Low-G interrupt register fields */
> +#define BMA150_LOW_G_EN_POS		0
> +#define BMA150_LOW_G_EN_MSK		0x01
> +#define BMA150_LOW_G_EN_REG		BMA150_CTRL_1_REG
> +
> +#define BMA150_LOW_G_HYST_POS		0
> +#define BMA150_LOW_G_HYST_MSK		0x07
> +#define BMA150_LOW_G_HYST_REG		BMA150_CFG_5_REG
> +
> +#define BMA150_LOW_G_DUR_REG		BMA150_CFG_1_REG
> +#define BMA150_LOW_G_THRES_REG		BMA150_CFG_0_REG
> +
> +struct bma150_data {
> +	struct i2c_client *client;
> +	struct input_polled_dev *input_polled;
> +	struct input_dev *input;
> +};
> +
> +/*
> + * The settings for the given range, bandwidth and interrupt features
> + * are stated and verified by Bosch Sensortec where they are configured
> + * to provide a generic sensitivity performance.
> + */
> +static struct bma150_cfg default_cfg __initdata = {
> +	.any_motion_int = 1,
> +	.hg_int = 1,
> +	.lg_int = 1,
> +	.any_motion_dur = 0,
> +	.any_motion_thres = 0,
> +	.hg_hyst = 0,
> +	.hg_dur = 150,
> +	.hg_thres = 160,
> +	.lg_hyst = 0,
> +	.lg_dur = 150,
> +	.lg_thres = 20,
> +	.range = BMA150_RANGE_2G,
> +	.bandwidth = BMA150_BW_50HZ
> +};
> +
> +static int bma150_write_byte(struct i2c_client *client, u8 reg, u8 val)
> +{
> +	s32 ret;
> +
> +	/* As per specification, disable irq in between register writes */
> +	if (client->irq)
> +		disable_irq_nosync(client->irq);
> +
> +	ret = i2c_smbus_write_byte_data(client, reg, val);
> +
> +	if (client->irq)
> +		enable_irq(client->irq);
> +	return ret;
> +}
> +
> +static int bma150_set_reg_bits(struct i2c_client *client,
> +					int val, int shift, u8 mask, u8 reg)
> +{
> +	int data = i2c_smbus_read_byte_data(client, reg);
> +
> +	if (data < 0)
> +		return data;
> +
> +	data = (data & ~mask) | ((val << shift) & mask);
> +	return bma150_write_byte(client, reg, data);
> +}
> +
> +static int bma150_set_mode(struct i2c_client *client, u8 mode)
> +{
> +	s32 ret;
> +
> +	ret = bma150_set_reg_bits(client, mode, BMA150_WAKE_UP_POS,
> +				BMA150_WAKE_UP_MSK, BMA150_WAKE_UP_REG);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_set_reg_bits(client, mode, BMA150_SLEEP_POS,
> +				BMA150_SLEEP_MSK, BMA150_SLEEP_REG);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (mode == BMA150_MODE_NORMAL)
> +		msleep(2);
> +	return ret;
> +}
> +
> +static int __devinit bma150_soft_reset(struct i2c_client *client)
> +{
> +	s32 ret;
> +
> +	ret = bma150_set_reg_bits(client, 1, BMA150_SW_RES_POS,
> +			BMA150_SW_RES_MSK, BMA150_SW_RES_REG);
> +	msleep(2);
> +	return ret;
> +}
> +
> +static int __devinit bma150_set_range(struct i2c_client *client, u8 range)
> +{
> +	s32 ret;
> +
> +	ret = bma150_set_reg_bits(client, range, BMA150_RANGE_POS,
> +				BMA150_RANGE_MSK, BMA150_RANGE_REG);
> +	return ret;
> +}
> +
> +static int __devinit bma150_set_bandwidth(struct i2c_client *client, u8 bw)
> +{
> +	s32 ret;
> +
> +	ret = bma150_set_reg_bits(client, bw, BMA150_BANDWIDTH_POS,
> +				BMA150_BANDWIDTH_MSK, BMA150_BANDWIDTH_REG);
> +	return ret;
> +}
> +
> +static int __devinit bma150_set_low_g_interrupt(struct i2c_client *client,
> +					u8 enable, u8 hyst, u8 dur, u8 thres)
> +{
> +	s32 ret;
> +	struct bma150_data *bma150 = i2c_get_clientdata(client);
> +
> +	ret = bma150_set_reg_bits(bma150->client, hyst,
> +				BMA150_LOW_G_HYST_POS, BMA150_LOW_G_HYST_MSK,
> +				BMA150_LOW_G_HYST_REG);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_write_byte(bma150->client,	BMA150_LOW_G_DUR_REG, dur);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_write_byte(bma150->client,	BMA150_LOW_G_THRES_REG, thres);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_set_reg_bits(bma150->client, !!enable,
> +				BMA150_LOW_G_EN_POS, BMA150_LOW_G_EN_MSK,
> +				BMA150_LOW_G_EN_REG);
> +	return ret;
> +}
> +
> +static int __devinit bma150_set_high_g_interrupt(struct i2c_client *client,
> +					u8 enable, u8 hyst, u8 dur, u8 thres)
> +{
> +	s32 ret;
> +	struct bma150_data *bma150 = i2c_get_clientdata(client);
> +
> +	ret = bma150_set_reg_bits(bma150->client, hyst,
> +				BMA150_HIGH_G_HYST_POS, BMA150_HIGH_G_HYST_MSK,
> +				BMA150_HIGH_G_HYST_REG);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_write_byte(bma150->client,	BMA150_HIGH_G_DUR_REG, dur);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_write_byte(bma150->client,	BMA150_HIGH_G_THRES_REG, thres);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_set_reg_bits(bma150->client, !!enable,
> +				BMA150_HIGH_G_EN_POS, BMA150_HIGH_G_EN_MSK,
> +				BMA150_HIGH_G_EN_REG);
> +	return ret;
> +}
> +
> +
> +static int __devinit bma150_set_any_motion_interrupt(struct i2c_client *client,
> +						u8 enable, u8 dur, u8 thres)
> +{
> +	s32 ret;
> +	struct bma150_data *bma150 = i2c_get_clientdata(client);
> +
> +	ret = bma150_set_reg_bits(bma150->client, dur,
> +				BMA150_ANY_MOTION_DUR_POS,
> +				BMA150_ANY_MOTION_DUR_MSK,
> +				BMA150_ANY_MOTION_DUR_REG);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_write_byte(bma150->client,
> +				BMA150_ANY_MOTION_THRES_REG, thres);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_set_reg_bits(bma150->client, !!enable,
> +				BMA150_ADV_INT_EN_POS, BMA150_ADV_INT_EN_MSK,
> +				BMA150_ADV_INT_EN_REG);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_set_reg_bits(bma150->client, !!enable,
> +				BMA150_ANY_MOTION_EN_POS,
> +				BMA150_ANY_MOTION_EN_MSK,
> +				BMA150_ANY_MOTION_EN_REG);
> +	return ret;
> +}
> +
> +static void bma150_report_xyz(struct bma150_data *bma150)
> +{
> +	u8 data[BMA150_XYZ_DATA_SIZE];
> +	s16 x, y, z;
> +	s32 ret;
> +
> +	ret = i2c_smbus_read_i2c_block_data(bma150->client,
> +			BMA150_ACC_X_LSB_REG, BMA150_XYZ_DATA_SIZE, data);
> +	if (ret != BMA150_XYZ_DATA_SIZE)
> +		return;
> +
> +	x = ((0xc0 & data[0]) >> 6) | (data[1] << 2);
> +	y = ((0xc0 & data[2]) >> 6) | (data[3] << 2);
> +	z = ((0xc0 & data[4]) >> 6) | (data[5] << 2);
> +
> +	/* sign extension */
> +	x = (s16) (x << 6) >> 6;
> +	y = (s16) (y << 6) >> 6;
> +	z = (s16) (z << 6) >> 6;
> +
> +	input_report_abs(bma150->input, ABS_X, x);
> +	input_report_abs(bma150->input, ABS_Y, y);
> +	input_report_abs(bma150->input, ABS_Z, z);
> +	input_sync(bma150->input);
> +}
> +
> +static irqreturn_t bma150_irq_thread(int irq, void *dev)
> +{
> +	bma150_report_xyz(dev);
> +	return IRQ_HANDLED;
> +}
> +
> +static void bma150_poll(struct input_polled_dev *dev)
> +{
> +	bma150_report_xyz(dev->private);
> +}
> +
> +static int bma150_open(struct bma150_data *bma150)
> +{
> +	int ret;
> +
> +	ret = pm_runtime_set_active(&bma150->client->dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	pm_runtime_enable(&bma150->client->dev);
> +
> +	return bma150_set_mode(bma150->client, BMA150_MODE_NORMAL);
> +}
> +
> +static void bma150_close(struct bma150_data *bma150)
> +{
> +	pm_runtime_disable(&bma150->client->dev);
> +	pm_runtime_set_suspended(&bma150->client->dev);
> +	bma150_set_mode(bma150->client, BMA150_MODE_SLEEP);
> +}
> +
> +static int bma150_irq_open(struct input_dev *input)
> +{
> +	struct bma150_data *bma150 = input_get_drvdata(input);
> +
> +	return bma150_open(bma150);
> +}
> +
> +static void bma150_irq_close(struct input_dev *input)
> +{
> +	struct bma150_data *bma150 = input_get_drvdata(input);
> +
> +	bma150_close(bma150);
> +}
> +
> +static void bma150_poll_open(struct input_polled_dev *ipoll_dev)
> +{
> +	struct bma150_data *bma150 = ipoll_dev->private;
> +
> +	bma150_open(bma150);
> +}
> +
> +static void bma150_poll_close(struct input_polled_dev *ipoll_dev)
> +{
> +	struct bma150_data *bma150 = ipoll_dev->private;
> +
> +	bma150_close(bma150);
> +}
> +
> +static void bma150_free_input_device(struct bma150_data *bma150)
> +{
> +	if (bma150->client->irq > 0)
> +		input_unregister_device(bma150->input);
> +	else
> +		input_unregister_polled_device(bma150->input_polled);
> +}
> +
> +static int __devinit bma150_initialize(struct i2c_client *client,
> +				       struct bma150_cfg *cfg)
> +{
> +	s32 ret;
> +
> +	ret = bma150_soft_reset(client);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_set_bandwidth(client, cfg->bandwidth);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_set_range(client, cfg->range);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (!client->irq)
> +		goto exit;
> +
> +	ret = bma150_set_any_motion_interrupt(client, cfg->any_motion_int,
> +			cfg->any_motion_dur, cfg->any_motion_thres);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_set_high_g_interrupt(client, cfg->hg_int,
> +			cfg->hg_hyst, cfg->hg_dur, cfg->hg_thres);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = bma150_set_low_g_interrupt(client, cfg->lg_int,
> +			cfg->lg_hyst, cfg->lg_dur, cfg->lg_thres);
> +	if (ret < 0)
> +		return ret;
> +exit:
> +	ret = bma150_set_mode(client, BMA150_MODE_SLEEP);
> +	return ret;
> +}
> +
> +static int __devinit bma150_setup_input_device(struct bma150_data *bma150)
> +{
> +	struct input_polled_dev *ipoll_dev;
> +	struct input_dev *idev;
> +	int ret;
> +
> +	if (bma150->client->irq > 0) {
> +		idev = input_allocate_device();
> +		if (!idev)
> +			return -ENOMEM;
> +		idev->open = bma150_irq_open;
> +		idev->close = bma150_irq_close;
> +		input_set_drvdata(idev, bma150);
> +	} else {
> +		ipoll_dev = input_allocate_polled_device();
> +		if (!ipoll_dev)
> +			return -ENOMEM;
> +		ipoll_dev->private = bma150;
> +		ipoll_dev->open = bma150_poll_open;
> +		ipoll_dev->close = bma150_poll_close;
> +		ipoll_dev->poll = bma150_poll;
> +		ipoll_dev->poll_interval = BMA150_POLL_INTERVAL;
> +		ipoll_dev->poll_interval_min = BMA150_POLL_MIN;
> +		ipoll_dev->poll_interval_max = BMA150_POLL_MAX;
> +
> +		idev = ipoll_dev->input;
> +	}
> +
> +	idev->name = BMA150_DRIVER;
> +	idev->phys = BMA150_DRIVER "/input0";
> +	idev->id.bustype = BUS_I2C;
> +	idev->dev.parent = &bma150->client->dev;
> +
> +	idev->evbit[0] = BIT_MASK(EV_ABS);
> +	input_set_abs_params(idev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
> +	input_set_abs_params(idev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
> +	input_set_abs_params(idev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
> +
> +	if (bma150->client->irq > 0) {
> +		ret = input_register_device(idev);
> +		if (ret < 0) {
> +			input_free_device(idev);
> +			return ret;
> +		}
> +		ret = request_threaded_irq(bma150->client->irq, NULL,
> +			bma150_irq_thread, IRQF_TRIGGER_RISING | IRQF_ONESHOT,
> +			BMA150_DRIVER, bma150);
> +		if (ret < 0) {
> +			dev_err(&bma150->client->dev,
> +				"irq request failed %d, ret %d\n",
> +				bma150->client->irq, ret);
> +			goto error_irq;
> +		}
> +	} else {
> +		ret = input_register_polled_device(ipoll_dev);
> +		if (ret < 0) {
> +			input_free_polled_device(ipoll_dev);
> +			return ret;
> +		}
> +		bma150->input_polled = ipoll_dev;
> +	}
> +	bma150->input = idev;
> +	return ret;
> +
> +error_irq:
> +	bma150_free_input_device(bma150);
> +	return ret;
> +}
> +
> +static int __devinit bma150_probe(struct i2c_client *client,
> +				  const struct i2c_device_id *id)
> +{
> +	struct bma150_cfg *cfg;
> +	struct bma150_data *bma150;
> +	struct bma150_platform_data *pdata;
> +	int ret;
> +
> +	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> +		dev_err(&client->dev, "i2c_check_functionality error\n");
> +		return -EIO;
> +	}
> +
> +	ret = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
> +	if (ret != BMA150_CHIP_ID) {
> +		dev_err(&client->dev, "BMA150 chip id error: %d\n", ret);
> +		return -EINVAL;
> +	}
> +
> +	bma150 = kzalloc(sizeof(struct bma150_data), GFP_KERNEL);
> +	if (!bma150)
> +		return -ENOMEM;
> +
> +	i2c_set_clientdata(client, bma150);
> +	bma150->client = client;
> +
> +	pdata = client->dev.platform_data;
> +	if (pdata) {
> +		if (pdata->irq_gpio_cfg && (pdata->irq_gpio_cfg() < 0)) {
> +			dev_err(&client->dev,
> +				"IRQ GPIO conf. error %d, ret %d\n",
> +				client->irq, ret);
> +			goto kfree_exit;
> +		}
> +		cfg = &pdata->cfg;
> +	} else {
> +		cfg = &default_cfg;
> +	}
> +	ret = bma150_initialize(client, cfg);
> +	if (ret < 0)
> +		goto kfree_exit;
> +
> +	ret = bma150_setup_input_device(bma150);
> +	if (ret < 0)
> +		goto kfree_exit;
> +
> +	dev_info(&client->dev, "Registered BMA150 I2C driver\n");
> +	return 0;
> +
> +kfree_exit:
> +	kfree(bma150);
> +	return ret;
> +}
> +
> +#if defined(CONFIG_PM) || defined(CONFIG_PM_RUNTIME)
> +static int bma150_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +
> +	return bma150_set_mode(client, BMA150_MODE_SLEEP);
> +}
> +
> +static int bma150_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +
> +	return bma150_set_mode(client, BMA150_MODE_NORMAL);
> +}
> +#endif
> +
> +static int __devexit bma150_remove(struct i2c_client *client)
> +{
> +	struct bma150_data *bma150 = i2c_get_clientdata(client);
> +
> +	pm_runtime_disable(&bma150->client->dev);
> +	bma150_free_input_device(bma150);
> +	kfree(bma150);
> +	return 0;
> +}
> +
> +static UNIVERSAL_DEV_PM_OPS(bma150_pm, bma150_suspend, bma150_resume, NULL);
> +
> +static const struct i2c_device_id bma150_id[] = {
> +	{ "bma150", 0 },
> +	{ "smb380", 0 },
> +	{ "bma023", 0 },
> +	{ }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, bma150_id);
> +
> +static struct i2c_driver bma150_driver = {
> +	.driver = {
> +		.owner	= THIS_MODULE,
> +		.name	= BMA150_DRIVER,
> +		.pm	= &bma150_pm,
> +	},
> +	.class          = I2C_CLASS_HWMON,
> +	.id_table	= bma150_id,
> +	.probe		= bma150_probe,
> +	.remove		= __devexit_p(bma150_remove),
> +};
> +
> +static int __init BMA150_init(void)
> +{
> +	return i2c_add_driver(&bma150_driver);
> +}
> +
> +static void __exit BMA150_exit(void)
> +{
> +	i2c_del_driver(&bma150_driver);
> +}
> +
> +MODULE_AUTHOR("Albert Zhang <xu.zhang@bosch-sensortec.com>");
> +MODULE_DESCRIPTION("BMA150 driver");
> +MODULE_LICENSE("GPL");
> +
> +module_init(BMA150_init);
> +module_exit(BMA150_exit);
> +
> diff --git a/include/linux/bma150.h b/include/linux/bma150.h
> new file mode 100644
> index 0000000..7a8bbce
> --- /dev/null
> +++ b/include/linux/bma150.h
> @@ -0,0 +1,47 @@
> +/*
> + * Copyright (c) 2011 Bosch Sensortec GmbH
> + * Copyright (c) 2011 Unixphere
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +#ifndef _BMA150_H_
> +#define _BMA150_H_
> +
> +#define BMA150_DRIVER		"bma150"
> +
> +struct bma150_cfg {
> +	bool any_motion_int;		/* Set to enable any-motion interrupt */
> +	bool hg_int;			/* Set to enable high-G interrupt */
> +	bool lg_int;			/* Set to enable low-G interrupt */
> +	unsigned char any_motion_dur;	/* Any-motion duration */
> +	unsigned char any_motion_thres;	/* Any-motion threshold */
> +	unsigned char hg_hyst;		/* High-G hysterisis */
> +	unsigned char hg_dur;		/* High-G duration */
> +	unsigned char hg_thres;		/* High-G threshold */
> +	unsigned char lg_hyst;		/* Low-G hysterisis */
> +	unsigned char lg_dur;		/* Low-G duration */
> +	unsigned char lg_thres;		/* Low-G threshold */
> +	unsigned char range;		/* BMA0150_RANGE_xxx (in G) */
> +	unsigned char bandwidth;	/* BMA0150_BW_xxx (in Hz) */
> +};
> +
> +struct bma150_platform_data {
> +	struct bma150_cfg cfg;
> +	int (*irq_gpio_cfg)(void);
> +};
> +
> +#endif /* _BMA150_H_ */
> +

Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[Dmitry Torokhov]

Hi Eric,

On Wed, Jul 27, 2011 at 10:53:47PM +0200, Eric Andersson wrote:
> +
> +static int bma150_open(struct bma150_data *bma150)
> +{
> +	int ret;
> +
> +	ret = pm_runtime_set_active(&bma150->client->dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	pm_runtime_enable(&bma150->client->dev);

I am pretty sure you want to call pm_runtime_enable() in bma150_probe()
so that parent controller can be suspended until somebody calls
bma150_open() and we mark the device as active (which, in turn, should
wake up its parent).

> +
> +	return bma150_set_mode(bma150->client, BMA150_MODE_NORMAL);
> +}
> +
> +static void bma150_close(struct bma150_data *bma150)
> +{
> +	pm_runtime_disable(&bma150->client->dev);

And disable should go into bma150_remove() unless I misunderstand
runtime PM framework.

> +	pm_runtime_set_suspended(&bma150->client->dev);
> +	bma150_set_mode(bma150->client, BMA150_MODE_SLEEP);

I think you want to call bma150_set_mode() first and then mark device as
suspended so that parent can go to sleep as well.

Thanks.

-- 
Dmitry

Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[Eric Andersson]

> > +static int bma150_open(struct bma150_data *bma150)
> > +{
> > +	int ret;
> > +
> > +	ret = pm_runtime_set_active(&bma150->client->dev);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	pm_runtime_enable(&bma150->client->dev);
> 
> I am pretty sure you want to call pm_runtime_enable() in bma150_probe()
> so that parent controller can be suspended until somebody calls
> bma150_open() and we mark the device as active (which, in turn, should
> wake up its parent).

If I call pm_runtime_enable() I cannot use pm_runtime_set_active() later
according to the comment in __pm_runtime_set_status (runtime.c):
"If runtime PM of the device is disabled or its power.runtime_error
field is different from zero, the status may be changed either to
RPM_ACTIVE, or to RPM_SUSPENDED..."

If the PM of the device is enabled it will return -EAGAIN. Of course, we
could enable() in probe, then disable(); set_active(); enable(); in
open, but that seems a bit confused, right?

> > +
> > +	return bma150_set_mode(bma150->client, BMA150_MODE_NORMAL);
> > +}
> > +
> > +static void bma150_close(struct bma150_data *bma150)
> > +{
> > +	pm_runtime_disable(&bma150->client->dev);
> 
> And disable should go into bma150_remove() unless I misunderstand
> runtime PM framework.

This is once again to make sure the PM is disabled when changing status.

I am not entirely familiar with the details of runtime PM, but either
the above works or we have to revert back to using #ifdefs which I would
prefer not to.

-- 
Best regards,
 Eric

http://www.unixphere.com

Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[Dmitry Torokhov]

On Sun, Jul 31, 2011 at 12:49:17AM +0200, Eric Andersson wrote:
> > > +static int bma150_open(struct bma150_data *bma150)
> > > +{
> > > +	int ret;
> > > +
> > > +	ret = pm_runtime_set_active(&bma150->client->dev);
> > > +	if (ret < 0)
> > > +		return ret;
> > > +
> > > +	pm_runtime_enable(&bma150->client->dev);
> > 
> > I am pretty sure you want to call pm_runtime_enable() in bma150_probe()
> > so that parent controller can be suspended until somebody calls
> > bma150_open() and we mark the device as active (which, in turn, should
> > wake up its parent).
> 
> If I call pm_runtime_enable() I cannot use pm_runtime_set_active() later
> according to the comment in __pm_runtime_set_status (runtime.c):
> "If runtime PM of the device is disabled or its power.runtime_error
> field is different from zero, the status may be changed either to
> RPM_ACTIVE, or to RPM_SUSPENDED..."
> 
> If the PM of the device is enabled it will return -EAGAIN. Of course, we
> could enable() in probe, then disable(); set_active(); enable(); in
> open, but that seems a bit confused, right?

Hmm, indeed. I do not like the idea about disable/set_active/enable so I
guess we'll have to keep track of the current mode themselves and call
bma150_set_mode() ourselves if, after calling pm_runtime_get/put_sync()
we find that our mode is different from what we expect it to be.

I also noticed that you did not properly free IRQ on device removal and
also polled devices need to be freed always (unlike regular input
devices that should be only unregistered). The default_cfg can't be
__initdata because it is used by __devinit functions. And my version of
GCC can't figure out that ipoll_dev never used uninitialized and gives
false warning.

I tried correcting these issues in the patch below, along with renaming
'ret' to 'error' which I prefer when we dealing with error handling.
Could you please git it a try and if everything still works I'll fold it
and commit.

Thanks!

-- 
Dmitry


Input: bma150 - misc changes

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

 drivers/input/misc/bma150.c |  458 +++++++++++++++++++++++--------------------
 1 files changed, 248 insertions(+), 210 deletions(-)


diff --git a/drivers/input/misc/bma150.c b/drivers/input/misc/bma150.c
index dd509a9..8f55b54 100644
--- a/drivers/input/misc/bma150.c
+++ b/drivers/input/misc/bma150.c
@@ -150,6 +150,7 @@ struct bma150_data {
 	struct i2c_client *client;
 	struct input_polled_dev *input_polled;
 	struct input_dev *input;
+	u8 mode;
 };
 
 /*
@@ -157,7 +158,7 @@ struct bma150_data {
  * are stated and verified by Bosch Sensortec where they are configured
  * to provide a generic sensitivity performance.
  */
-static struct bma150_cfg default_cfg __initdata = {
+static struct bma150_cfg default_cfg __devinitdata = {
 	.any_motion_int = 1,
 	.hg_int = 1,
 	.lg_int = 1,
@@ -185,14 +186,16 @@ static int bma150_write_byte(struct i2c_client *client, u8 reg, u8 val)
 
 	if (client->irq)
 		enable_irq(client->irq);
+
 	return ret;
 }
 
 static int bma150_set_reg_bits(struct i2c_client *client,
 					int val, int shift, u8 mask, u8 reg)
 {
-	int data = i2c_smbus_read_byte_data(client, reg);
+	int data;
 
+	data = i2c_smbus_read_byte_data(client, reg);
 	if (data < 0)
 		return data;
 
@@ -200,135 +203,130 @@ static int bma150_set_reg_bits(struct i2c_client *client,
 	return bma150_write_byte(client, reg, data);
 }
 
-static int bma150_set_mode(struct i2c_client *client, u8 mode)
+static int bma150_set_mode(struct bma150_data *bma150, u8 mode)
 {
-	s32 ret;
+	int error;
 
-	ret = bma150_set_reg_bits(client, mode, BMA150_WAKE_UP_POS,
+	error = bma150_set_reg_bits(bma150->client, mode, BMA150_WAKE_UP_POS,
 				BMA150_WAKE_UP_MSK, BMA150_WAKE_UP_REG);
-	if (ret < 0)
-		return ret;
+	if (error)
+		return error;
 
-	ret = bma150_set_reg_bits(client, mode, BMA150_SLEEP_POS,
+	error = bma150_set_reg_bits(bma150->client, mode, BMA150_SLEEP_POS,
 				BMA150_SLEEP_MSK, BMA150_SLEEP_REG);
-	if (ret < 0)
-		return ret;
+	if (error)
+		return error;
 
 	if (mode == BMA150_MODE_NORMAL)
 		msleep(2);
-	return ret;
+
+	bma150->mode = mode;
+	return 0;
 }
 
-static int __devinit bma150_soft_reset(struct i2c_client *client)
+static int __devinit bma150_soft_reset(struct bma150_data *bma150)
 {
-	s32 ret;
+	int error;
+
+	error = bma150_set_reg_bits(bma150->client, 1, BMA150_SW_RES_POS,
+				BMA150_SW_RES_MSK, BMA150_SW_RES_REG);
+	if (error)
+		return error;
 
-	ret = bma150_set_reg_bits(client, 1, BMA150_SW_RES_POS,
-			BMA150_SW_RES_MSK, BMA150_SW_RES_REG);
 	msleep(2);
-	return ret;
+	return 0;
 }
 
-static int __devinit bma150_set_range(struct i2c_client *client, u8 range)
+static int __devinit bma150_set_range(struct bma150_data *bma150, u8 range)
 {
-	s32 ret;
-
-	ret = bma150_set_reg_bits(client, range, BMA150_RANGE_POS,
+	return bma150_set_reg_bits(bma150->client, range, BMA150_RANGE_POS,
 				BMA150_RANGE_MSK, BMA150_RANGE_REG);
-	return ret;
 }
 
-static int __devinit bma150_set_bandwidth(struct i2c_client *client, u8 bw)
+static int __devinit bma150_set_bandwidth(struct bma150_data *bma150, u8 bw)
 {
-	s32 ret;
-
-	ret = bma150_set_reg_bits(client, bw, BMA150_BANDWIDTH_POS,
+	return bma150_set_reg_bits(bma150->client, bw, BMA150_BANDWIDTH_POS,
 				BMA150_BANDWIDTH_MSK, BMA150_BANDWIDTH_REG);
-	return ret;
 }
 
-static int __devinit bma150_set_low_g_interrupt(struct i2c_client *client,
+static int __devinit bma150_set_low_g_interrupt(struct bma150_data *bma150,
 					u8 enable, u8 hyst, u8 dur, u8 thres)
 {
-	s32 ret;
-	struct bma150_data *bma150 = i2c_get_clientdata(client);
+	int error;
 
-	ret = bma150_set_reg_bits(bma150->client, hyst,
+	error = bma150_set_reg_bits(bma150->client, hyst,
 				BMA150_LOW_G_HYST_POS, BMA150_LOW_G_HYST_MSK,
 				BMA150_LOW_G_HYST_REG);
-	if (ret < 0)
-		return ret;
+	if (error)
+		return error;
 
-	ret = bma150_write_byte(bma150->client,	BMA150_LOW_G_DUR_REG, dur);
-	if (ret < 0)
-		return ret;
+	error = bma150_write_byte(bma150->client, BMA150_LOW_G_DUR_REG, dur);
+	if (error)
+		return error;
 
-	ret = bma150_write_byte(bma150->client,	BMA150_LOW_G_THRES_REG, thres);
-	if (ret < 0)
-		return ret;
+	error = bma150_write_byte(bma150->client, BMA150_LOW_G_THRES_REG, thres);
+	if (error)
+		return error;
 
-	ret = bma150_set_reg_bits(bma150->client, !!enable,
+	return bma150_set_reg_bits(bma150->client, !!enable,
 				BMA150_LOW_G_EN_POS, BMA150_LOW_G_EN_MSK,
 				BMA150_LOW_G_EN_REG);
-	return ret;
 }
 
-static int __devinit bma150_set_high_g_interrupt(struct i2c_client *client,
+static int __devinit bma150_set_high_g_interrupt(struct bma150_data *bma150,
 					u8 enable, u8 hyst, u8 dur, u8 thres)
 {
-	s32 ret;
-	struct bma150_data *bma150 = i2c_get_clientdata(client);
+	int error;
 
-	ret = bma150_set_reg_bits(bma150->client, hyst,
+	error = bma150_set_reg_bits(bma150->client, hyst,
 				BMA150_HIGH_G_HYST_POS, BMA150_HIGH_G_HYST_MSK,
 				BMA150_HIGH_G_HYST_REG);
-	if (ret < 0)
-		return ret;
+	if (error)
+		return error;
 
-	ret = bma150_write_byte(bma150->client,	BMA150_HIGH_G_DUR_REG, dur);
-	if (ret < 0)
-		return ret;
+	error = bma150_write_byte(bma150->client,
+				BMA150_HIGH_G_DUR_REG, dur);
+	if (error)
+		return error;
 
-	ret = bma150_write_byte(bma150->client,	BMA150_HIGH_G_THRES_REG, thres);
-	if (ret < 0)
-		return ret;
+	error = bma150_write_byte(bma150->client,
+				BMA150_HIGH_G_THRES_REG, thres);
+	if (error)
+		return error;
 
-	ret = bma150_set_reg_bits(bma150->client, !!enable,
+	return bma150_set_reg_bits(bma150->client, !!enable,
 				BMA150_HIGH_G_EN_POS, BMA150_HIGH_G_EN_MSK,
 				BMA150_HIGH_G_EN_REG);
-	return ret;
 }
 
 
-static int __devinit bma150_set_any_motion_interrupt(struct i2c_client *client,
+static int __devinit bma150_set_any_motion_interrupt(struct bma150_data *bma150,
 						u8 enable, u8 dur, u8 thres)
 {
-	s32 ret;
-	struct bma150_data *bma150 = i2c_get_clientdata(client);
+	int error;
 
-	ret = bma150_set_reg_bits(bma150->client, dur,
+	error = bma150_set_reg_bits(bma150->client, dur,
 				BMA150_ANY_MOTION_DUR_POS,
 				BMA150_ANY_MOTION_DUR_MSK,
 				BMA150_ANY_MOTION_DUR_REG);
-	if (ret < 0)
-		return ret;
+	if (error)
+		return error;
 
-	ret = bma150_write_byte(bma150->client,
+	error = bma150_write_byte(bma150->client,
 				BMA150_ANY_MOTION_THRES_REG, thres);
-	if (ret < 0)
-		return ret;
+	if (error)
+		return error;
 
-	ret = bma150_set_reg_bits(bma150->client, !!enable,
+	error = bma150_set_reg_bits(bma150->client, !!enable,
 				BMA150_ADV_INT_EN_POS, BMA150_ADV_INT_EN_MSK,
 				BMA150_ADV_INT_EN_REG);
-	if (ret < 0)
-		return ret;
+	if (error)
+		return error;
 
-	ret = bma150_set_reg_bits(bma150->client, !!enable,
+	return bma150_set_reg_bits(bma150->client, !!enable,
 				BMA150_ANY_MOTION_EN_POS,
 				BMA150_ANY_MOTION_EN_MSK,
 				BMA150_ANY_MOTION_EN_REG);
-	return ret;
 }
 
 static void bma150_report_xyz(struct bma150_data *bma150)
@@ -360,6 +358,7 @@ static void bma150_report_xyz(struct bma150_data *bma150)
 static irqreturn_t bma150_irq_thread(int irq, void *dev)
 {
 	bma150_report_xyz(dev);
+
 	return IRQ_HANDLED;
 }
 
@@ -370,22 +369,31 @@ static void bma150_poll(struct input_polled_dev *dev)
 
 static int bma150_open(struct bma150_data *bma150)
 {
-	int ret;
-
-	ret = pm_runtime_set_active(&bma150->client->dev);
-	if (ret < 0)
-		return ret;
-
-	pm_runtime_enable(&bma150->client->dev);
+	int error;
+
+	error = pm_runtime_get_sync(&bma150->client->dev);
+	if (error && error != -ENOSYS)
+		return error;
+
+	/*
+	 * See if runtime PM woke up the device. If runtime PM
+	 * is disabled we need to do it ourselves.
+	 */
+	if (bma150->mode != BMA150_MODE_NORMAL) {
+		error = bma150_set_mode(bma150, BMA150_MODE_NORMAL);
+		if (error)
+			return error;
+	}
 
-	return bma150_set_mode(bma150->client, BMA150_MODE_NORMAL);
+	return 0;
 }
 
 static void bma150_close(struct bma150_data *bma150)
 {
-	pm_runtime_disable(&bma150->client->dev);
-	pm_runtime_set_suspended(&bma150->client->dev);
-	bma150_set_mode(bma150->client, BMA150_MODE_SLEEP);
+	pm_runtime_put_sync(&bma150->client->dev);
+
+	if (bma150->mode != BMA150_MODE_SLEEP)
+		bma150_set_mode(bma150, BMA150_MODE_SLEEP);
 }
 
 static int bma150_irq_open(struct input_dev *input)
@@ -416,81 +424,50 @@ static void bma150_poll_close(struct input_polled_dev *ipoll_dev)
 	bma150_close(bma150);
 }
 
-static void bma150_free_input_device(struct bma150_data *bma150)
+static int __devinit bma150_initialize(struct bma150_data *bma150,
+				       const struct bma150_cfg *cfg)
 {
-	if (bma150->client->irq > 0)
-		input_unregister_device(bma150->input);
-	else
-		input_unregister_polled_device(bma150->input_polled);
-}
-
-static int __devinit bma150_initialize(struct i2c_client *client,
-				       struct bma150_cfg *cfg)
-{
-	s32 ret;
+	int error;
+
+	error = bma150_soft_reset(bma150);
+	if (error)
+		return error;
+
+	error = bma150_set_bandwidth(bma150, cfg->bandwidth);
+	if (error)
+		return error;
+
+	error = bma150_set_range(bma150, cfg->range);
+	if (error)
+		return error;
+
+	if (bma150->client->irq) {
+		error = bma150_set_any_motion_interrupt(bma150,
+					cfg->any_motion_int,
+					cfg->any_motion_dur,
+					cfg->any_motion_thres);
+		if (error)
+			return error;
+
+		error = bma150_set_high_g_interrupt(bma150,
+					cfg->hg_int, cfg->hg_hyst,
+					cfg->hg_dur, cfg->hg_thres);
+		if (error)
+			return error;
+
+		error = bma150_set_low_g_interrupt(bma150,
+					cfg->lg_int, cfg->lg_hyst,
+					cfg->lg_dur, cfg->lg_thres);
+		if (error)
+			return error;
+	}
 
-	ret = bma150_soft_reset(client);
-	if (ret < 0)
-		return ret;
-
-	ret = bma150_set_bandwidth(client, cfg->bandwidth);
-	if (ret < 0)
-		return ret;
-
-	ret = bma150_set_range(client, cfg->range);
-	if (ret < 0)
-		return ret;
-
-	if (!client->irq)
-		goto exit;
-
-	ret = bma150_set_any_motion_interrupt(client, cfg->any_motion_int,
-			cfg->any_motion_dur, cfg->any_motion_thres);
-	if (ret < 0)
-		return ret;
-
-	ret = bma150_set_high_g_interrupt(client, cfg->hg_int,
-			cfg->hg_hyst, cfg->hg_dur, cfg->hg_thres);
-	if (ret < 0)
-		return ret;
-
-	ret = bma150_set_low_g_interrupt(client, cfg->lg_int,
-			cfg->lg_hyst, cfg->lg_dur, cfg->lg_thres);
-	if (ret < 0)
-		return ret;
-exit:
-	ret = bma150_set_mode(client, BMA150_MODE_SLEEP);
-	return ret;
+	return bma150_set_mode(bma150, BMA150_MODE_SLEEP);
 }
 
-static int __devinit bma150_setup_input_device(struct bma150_data *bma150)
+static void __devinit bma150_init_input_device(struct bma150_data *bma150,
+						struct input_dev *idev)
 {
-	struct input_polled_dev *ipoll_dev;
-	struct input_dev *idev;
-	int ret;
-
-	if (bma150->client->irq > 0) {
-		idev = input_allocate_device();
-		if (!idev)
-			return -ENOMEM;
-		idev->open = bma150_irq_open;
-		idev->close = bma150_irq_close;
-		input_set_drvdata(idev, bma150);
-	} else {
-		ipoll_dev = input_allocate_polled_device();
-		if (!ipoll_dev)
-			return -ENOMEM;
-		ipoll_dev->private = bma150;
-		ipoll_dev->open = bma150_poll_open;
-		ipoll_dev->close = bma150_poll_close;
-		ipoll_dev->poll = bma150_poll;
-		ipoll_dev->poll_interval = BMA150_POLL_INTERVAL;
-		ipoll_dev->poll_interval_min = BMA150_POLL_MIN;
-		ipoll_dev->poll_interval_max = BMA150_POLL_MAX;
-
-		idev = ipoll_dev->input;
-	}
-
 	idev->name = BMA150_DRIVER;
 	idev->phys = BMA150_DRIVER "/input0";
 	idev->id.bustype = BUS_I2C;
@@ -500,54 +477,81 @@ static int __devinit bma150_setup_input_device(struct bma150_data *bma150)
 	input_set_abs_params(idev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
 	input_set_abs_params(idev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
 	input_set_abs_params(idev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+}
 
-	if (bma150->client->irq > 0) {
-		ret = input_register_device(idev);
-		if (ret < 0) {
-			input_free_device(idev);
-			return ret;
-		}
-		ret = request_threaded_irq(bma150->client->irq, NULL,
-			bma150_irq_thread, IRQF_TRIGGER_RISING | IRQF_ONESHOT,
-			BMA150_DRIVER, bma150);
-		if (ret < 0) {
-			dev_err(&bma150->client->dev,
-				"irq request failed %d, ret %d\n",
-				bma150->client->irq, ret);
-			goto error_irq;
-		}
-	} else {
-		ret = input_register_polled_device(ipoll_dev);
-		if (ret < 0) {
-			input_free_polled_device(ipoll_dev);
-			return ret;
-		}
-		bma150->input_polled = ipoll_dev;
+static int __devinit bma150_register_input_device(struct bma150_data *bma150)
+{
+	struct input_dev *idev;
+	int error;
+
+	idev = input_allocate_device();
+	if (!idev)
+		return -ENOMEM;
+
+	bma150_init_input_device(bma150, idev);
+
+	idev->open = bma150_irq_open;
+	idev->close = bma150_irq_close;
+	input_set_drvdata(idev, bma150);
+
+	error = input_register_device(idev);
+	if (error) {
+		input_free_device(idev);
+		return error;
 	}
+
 	bma150->input = idev;
-	return ret;
+	return 0;
+}
 
-error_irq:
-	bma150_free_input_device(bma150);
-	return ret;
+static int __devinit bma150_register_polled_device(struct bma150_data *bma150)
+{
+	struct input_polled_dev *ipoll_dev;
+	int error;
+
+	ipoll_dev = input_allocate_polled_device();
+	if (!ipoll_dev)
+		return -ENOMEM;
+
+	ipoll_dev->private = bma150;
+	ipoll_dev->open = bma150_poll_open;
+	ipoll_dev->close = bma150_poll_close;
+	ipoll_dev->poll = bma150_poll;
+	ipoll_dev->poll_interval = BMA150_POLL_INTERVAL;
+	ipoll_dev->poll_interval_min = BMA150_POLL_MIN;
+	ipoll_dev->poll_interval_max = BMA150_POLL_MAX;
+
+	bma150_init_input_device(bma150, ipoll_dev->input);
+
+	error = input_register_polled_device(ipoll_dev);
+	if (error) {
+		input_free_polled_device(ipoll_dev);
+		return error;
+	}
+
+	bma150->input_polled = ipoll_dev;
+	bma150->input = ipoll_dev->input;
+
+	return 0;
 }
 
 static int __devinit bma150_probe(struct i2c_client *client,
 				  const struct i2c_device_id *id)
 {
-	struct bma150_cfg *cfg;
+	const struct bma150_platform_data *pdata = client->dev.platform_data;
+	const struct bma150_cfg *cfg;
 	struct bma150_data *bma150;
-	struct bma150_platform_data *pdata;
-	int ret;
+	int chip_id;
+	int error;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev, "i2c_check_functionality error\n");
 		return -EIO;
 	}
 
-	ret = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
-	if (ret != BMA150_CHIP_ID) {
-		dev_err(&client->dev, "BMA150 chip id error: %d\n", ret);
+	chip_id = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
+	if (chip_id != BMA150_CHIP_ID) {
+		dev_err(&client->dev, "BMA150 chip id error: %d\n", chip_id);
 		return -EINVAL;
 	}
 
@@ -555,62 +559,96 @@ static int __devinit bma150_probe(struct i2c_client *client,
 	if (!bma150)
 		return -ENOMEM;
 
-	i2c_set_clientdata(client, bma150);
 	bma150->client = client;
 
-	pdata = client->dev.platform_data;
 	if (pdata) {
-		if (pdata->irq_gpio_cfg && (pdata->irq_gpio_cfg() < 0)) {
-			dev_err(&client->dev,
-				"IRQ GPIO conf. error %d, ret %d\n",
-				client->irq, ret);
-			goto kfree_exit;
+		if (pdata->irq_gpio_cfg) {
+			error = pdata->irq_gpio_cfg();
+			if (error) {
+				dev_err(&client->dev,
+					"IRQ GPIO conf. error %d, error %d\n",
+					client->irq, error);
+				goto err_free_mem;
+			}
 		}
 		cfg = &pdata->cfg;
 	} else {
 		cfg = &default_cfg;
 	}
-	ret = bma150_initialize(client, cfg);
-	if (ret < 0)
-		goto kfree_exit;
 
-	ret = bma150_setup_input_device(bma150);
-	if (ret < 0)
-		goto kfree_exit;
+	error = bma150_initialize(bma150, cfg);
+	if (error)
+		goto err_free_mem;
+
+	if (client->irq > 0) {
+		error = bma150_register_input_device(bma150);
+		if (error)
+			goto err_free_mem;
+
+		error = request_threaded_irq(client->irq,
+					NULL, bma150_irq_thread,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					BMA150_DRIVER, bma150);
+		if (error) {
+			dev_err(&client->dev,
+				"irq request failed %d, error %d\n",
+				client->irq, error);
+			input_unregister_device(bma150->input);
+			goto err_free_mem;
+		}
+	} else {
+		error = bma150_register_polled_device(bma150);
+		if (error)
+			goto err_free_mem;
+	}
+
+	i2c_set_clientdata(client, bma150);
+
+	pm_runtime_enable(&client->dev);
 
-	dev_info(&client->dev, "Registered BMA150 I2C driver\n");
 	return 0;
 
-kfree_exit:
+err_free_mem:
 	kfree(bma150);
-	return ret;
+	return error;
 }
 
-#if defined(CONFIG_PM) || defined(CONFIG_PM_RUNTIME)
-static int bma150_suspend(struct device *dev)
+static int __devexit bma150_remove(struct i2c_client *client)
 {
-	struct i2c_client *client = to_i2c_client(dev);
+	struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+	pm_runtime_disable(&client->dev);
+
+	if (client->irq > 0) {
+		free_irq(client->irq, bma150);
+		input_unregister_device(bma150->input);
+	} else {
+		input_unregister_polled_device(bma150->input_polled);
+		input_free_polled_device(bma150->input_polled);
+	}
 
-	return bma150_set_mode(client, BMA150_MODE_SLEEP);
+	kfree(bma150);
+
+	return 0;
 }
 
-static int bma150_resume(struct device *dev)
+#ifdef CONFIG_PM
+static int bma150_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	struct bma150_data *bma150 = i2c_get_clientdata(client);
 
-	return bma150_set_mode(client, BMA150_MODE_NORMAL);
+	return bma150_set_mode(bma150, BMA150_MODE_SLEEP);
 }
-#endif
 
-static int __devexit bma150_remove(struct i2c_client *client)
+static int bma150_resume(struct device *dev)
 {
+	struct i2c_client *client = to_i2c_client(dev);
 	struct bma150_data *bma150 = i2c_get_clientdata(client);
 
-	pm_runtime_disable(&bma150->client->dev);
-	bma150_free_input_device(bma150);
-	kfree(bma150);
-	return 0;
+	return bma150_set_mode(bma150, BMA150_MODE_NORMAL);
 }
+#endif
 
 static UNIVERSAL_DEV_PM_OPS(bma150_pm, bma150_suspend, bma150_resume, NULL);
 
@@ -629,7 +667,7 @@ static struct i2c_driver bma150_driver = {
 		.name	= BMA150_DRIVER,
 		.pm	= &bma150_pm,
 	},
-	.class          = I2C_CLASS_HWMON,
+	.class		= I2C_CLASS_HWMON,
 	.id_table	= bma150_id,
 	.probe		= bma150_probe,
 	.remove		= __devexit_p(bma150_remove),

Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[Eric Andersson]

> On Sun, Jul 31, 2011 at 12:49:17AM +0200, Dmitry Torokhov wrote:
> > > > +static int bma150_open(struct bma150_data *bma150)
> > > > +{
> > > > + int ret;
> > > > +
> > > > + ret = pm_runtime_set_active(&bma150->client->dev);
> > > > + if (ret < 0)
> > > > +         return ret;
> > > > +
> > > > + pm_runtime_enable(&bma150->client->dev);
> > >
> > > I am pretty sure you want to call pm_runtime_enable() in bma150_probe()
> > > so that parent controller can be suspended until somebody calls
> > > bma150_open() and we mark the device as active (which, in turn, should
> > > wake up its parent).
> >
> > If I call pm_runtime_enable() I cannot use pm_runtime_set_active() later
> > according to the comment in __pm_runtime_set_status (runtime.c):
> > "If runtime PM of the device is disabled or its power.runtime_error
> > field is different from zero, the status may be changed either to
> > RPM_ACTIVE, or to RPM_SUSPENDED..."
> >
> > If the PM of the device is enabled it will return -EAGAIN. Of course, we
> > could enable() in probe, then disable(); set_active(); enable(); in
> > open, but that seems a bit confused, right?
> 
> Hmm, indeed. I do not like the idea about disable/set_active/enable so I
> guess we'll have to keep track of the current mode themselves and call
> bma150_set_mode() ourselves if, after calling pm_runtime_get/put_sync()
> we find that our mode is different from what we expect it to be.
> 
> I also noticed that you did not properly free IRQ on device removal and
> also polled devices need to be freed always (unlike regular input
> devices that should be only unregistered). The default_cfg can't be
> __initdata because it is used by __devinit functions. And my version of
> GCC can't figure out that ipoll_dev never used uninitialized and gives
> false warning.
> 
> I tried correcting these issues in the patch below, along with renaming
> 'ret' to 'error' which I prefer when we dealing with error handling.
> Could you please git it a try and if everything still works I'll fold it
> and commit.

Thanks Dmitry! I tried your patch and it worked like a charm!

Do you take it from here or would you like me to send an updated
version that includes your patch?

-- 
Best regards,
 Eric

http://www.unixphere.com
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Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[Dmitry Torokhov]

On Sun, Aug 07, 2011 at 06:23:25PM +0200, Eric Andersson wrote:
> > On Sun, Jul 31, 2011 at 12:49:17AM +0200, Dmitry Torokhov wrote:
> > > > > +static int bma150_open(struct bma150_data *bma150)
> > > > > +{
> > > > > + int ret;
> > > > > +
> > > > > + ret = pm_runtime_set_active(&bma150->client->dev);
> > > > > + if (ret < 0)
> > > > > +         return ret;
> > > > > +
> > > > > + pm_runtime_enable(&bma150->client->dev);
> > > >
> > > > I am pretty sure you want to call pm_runtime_enable() in bma150_probe()
> > > > so that parent controller can be suspended until somebody calls
> > > > bma150_open() and we mark the device as active (which, in turn, should
> > > > wake up its parent).
> > >
> > > If I call pm_runtime_enable() I cannot use pm_runtime_set_active() later
> > > according to the comment in __pm_runtime_set_status (runtime.c):
> > > "If runtime PM of the device is disabled or its power.runtime_error
> > > field is different from zero, the status may be changed either to
> > > RPM_ACTIVE, or to RPM_SUSPENDED..."
> > >
> > > If the PM of the device is enabled it will return -EAGAIN. Of course, we
> > > could enable() in probe, then disable(); set_active(); enable(); in
> > > open, but that seems a bit confused, right?
> > 
> > Hmm, indeed. I do not like the idea about disable/set_active/enable so I
> > guess we'll have to keep track of the current mode themselves and call
> > bma150_set_mode() ourselves if, after calling pm_runtime_get/put_sync()
> > we find that our mode is different from what we expect it to be.
> > 
> > I also noticed that you did not properly free IRQ on device removal and
> > also polled devices need to be freed always (unlike regular input
> > devices that should be only unregistered). The default_cfg can't be
> > __initdata because it is used by __devinit functions. And my version of
> > GCC can't figure out that ipoll_dev never used uninitialized and gives
> > false warning.
> > 
> > I tried correcting these issues in the patch below, along with renaming
> > 'ret' to 'error' which I prefer when we dealing with error handling.
> > Could you please git it a try and if everything still works I'll fold it
> > and commit.
> 
> Thanks Dmitry! I tried your patch and it worked like a charm!

Excellent, thanks for testing.

> 
> Do you take it from here or would you like me to send an updated
> version that includes your patch?

No, there is no need for that. I'll fold them all together and queue for
2.6.32.

I take the other patch that makes polled devices do poll upon opening
working well for you too.. Should I queue for .2 as well?

Thanks.

-- 
Dmitry
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Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

[Eric Andersson]

On 22:15 Sun 07 Aug     , Dmitry Torokhov wrote:
> On Sun, Aug 07, 2011 at 06:23:25PM +0200, Eric Andersson wrote:
> > > On Sun, Jul 31, 2011 at 12:49:17AM +0200, Dmitry Torokhov wrote:
> > > > > > +static int bma150_open(struct bma150_data *bma150)
> > > > > > +{
> > > > > > + int ret;
> > > > > > +
> > > > > > + ret = pm_runtime_set_active(&bma150->client->dev);
> > > > > > + if (ret < 0)
> > > > > > +         return ret;
> > > > > > +
> > > > > > + pm_runtime_enable(&bma150->client->dev);
> > > > >
> > > > > I am pretty sure you want to call pm_runtime_enable() in bma150_probe()
> > > > > so that parent controller can be suspended until somebody calls
> > > > > bma150_open() and we mark the device as active (which, in turn, should
> > > > > wake up its parent).
> > > >
> > > > If I call pm_runtime_enable() I cannot use pm_runtime_set_active() later
> > > > according to the comment in __pm_runtime_set_status (runtime.c):
> > > > "If runtime PM of the device is disabled or its power.runtime_error
> > > > field is different from zero, the status may be changed either to
> > > > RPM_ACTIVE, or to RPM_SUSPENDED..."
> > > >
> > > > If the PM of the device is enabled it will return -EAGAIN. Of course, we
> > > > could enable() in probe, then disable(); set_active(); enable(); in
> > > > open, but that seems a bit confused, right?
> > > 
> > > Hmm, indeed. I do not like the idea about disable/set_active/enable so I
> > > guess we'll have to keep track of the current mode themselves and call
> > > bma150_set_mode() ourselves if, after calling pm_runtime_get/put_sync()
> > > we find that our mode is different from what we expect it to be.
> > > 
> > > I also noticed that you did not properly free IRQ on device removal and
> > > also polled devices need to be freed always (unlike regular input
> > > devices that should be only unregistered). The default_cfg can't be
> > > __initdata because it is used by __devinit functions. And my version of
> > > GCC can't figure out that ipoll_dev never used uninitialized and gives
> > > false warning.
> > > 
> > > I tried correcting these issues in the patch below, along with renaming
> > > 'ret' to 'error' which I prefer when we dealing with error handling.
> > > Could you please git it a try and if everything still works I'll fold it
> > > and commit.
> > 
> > Thanks Dmitry! I tried your patch and it worked like a charm!
> 
> Excellent, thanks for testing.
> 
> > 
> > Do you take it from here or would you like me to send an updated
> > version that includes your patch?
> 
> No, there is no need for that. I'll fold them all together and queue for
> 2.6.32.
Great thanks! Don't forget to add Alan as reviewer. I think he forgot
reply-all when he mailed me:
"I'm happy with this one.
Reviewed-by: Alan Cox <alan@linux.intel.com>"

> I take the other patch that makes polled devices do poll upon opening
> working well for you too.. Should I queue for .2 as well?
Yes, why not!

-- 
Best regards,
 Eric

http://www.unixphere.com
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