* [PATCH v9 1/1] leds: LED driver for TI LP3952 6-Channel Color LED
@ 2016-07-08 10:37 Tony Makkiel
2016-07-08 19:28 ` Rafael J. Wysocki
2016-07-11 7:23 ` Jacek Anaszewski
0 siblings, 2 replies; 4+ messages in thread
From: Tony Makkiel @ 2016-07-08 10:37 UTC (permalink / raw)
To: linux-leds
Cc: Tony Makkiel, linux-acpi, j.anaszewski, rpurdie, rjw, lenb,
mika.westerberg
The chip can drive 2 sets of RGB leds. Controller can
be controlled via PWM, I2C and audio synchronisation.
This driver uses I2C to communicate with the chip.
Datasheet: http://www.ti.com/lit/gpn/lp3952
Signed-off-by: Tony Makkiel <tony.makkiel@daqri.com>
---
Changes from v8:
- Removed macro LP3952_ACPI_NAME.
- Replaced acpi_dev_get_property with device_property_read_string
- Skip led class registration if led data couldn't be read from
ACPI table.
drivers/leds/Kconfig | 13 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-lp3952.c | 306 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/leds-lp3952.h | 125 ++++++++++++++++++
4 files changed, 445 insertions(+)
create mode 100644 drivers/leds/leds-lp3952.c
create mode 100644 include/linux/leds-lp3952.h
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 5ae2834..0f321f4 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -228,6 +228,19 @@ config LEDS_LP3944
To compile this driver as a module, choose M here: the
module will be called leds-lp3944.
+config LEDS_LP3952
+ tristate "LED Support for TI LP3952 2 channel LED driver"
+ depends on LEDS_CLASS
+ depends on I2C
+ depends on ACPI
+ select REGMAP_I2C
+ help
+ This option enables support for LEDs connected to the Texas
+ Instruments LP3952 LED driver.
+
+ To compile this driver as a module, choose M here: the
+ module will be called leds-lp3952.
+
config LEDS_LP55XX_COMMON
tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index cb2013d..0684c86 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o
obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
+obj-$(CONFIG_LEDS_LP3952) += leds-lp3952.o
obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o
obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
diff --git a/drivers/leds/leds-lp3952.c b/drivers/leds/leds-lp3952.c
new file mode 100644
index 0000000..f8ac6ef
--- /dev/null
+++ b/drivers/leds/leds-lp3952.c
@@ -0,0 +1,306 @@
+/*
+ * LED driver for TI lp3952 controller
+ *
+ * Copyright (C) 2016, DAQRI, LLC.
+ * Author: Tony Makkiel <tony.makkiel@daqri.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/leds-lp3952.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+static int lp3952_register_write(struct i2c_client *client, u8 reg, u8 val)
+{
+ int ret;
+ struct lp3952_led_array *priv = i2c_get_clientdata(client);
+
+ ret = regmap_write(priv->regmap, reg, val);
+
+ if (ret)
+ dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
+ __func__, reg, val, ret);
+ return ret;
+}
+
+static void lp3952_on_off(struct lp3952_led_array *priv,
+ enum lp3952_leds led_id, int on)
+{
+ int ret, val;
+
+ dev_dbg(&priv->client->dev, "%s LED %d to %d\n", __func__, led_id, on);
+
+ val = 1 << led_id;
+ if (led_id == LP3952_LED_ALL)
+ val = LP3952_LED_MASK_ALL;
+
+ ret = regmap_update_bits(priv->regmap, LP3952_REG_LED_CTRL, val,
+ on ? val : 0);
+ if (ret)
+ dev_err(&priv->client->dev, "%s, Error %d\n", __func__, ret);
+}
+
+/*
+ * Using Imax to control brightness. There are 4 possible
+ * setting 25, 50, 75 and 100 % of Imax. Possible values are
+ * values 0-4. 0 meaning turn off.
+ */
+static int lp3952_set_brightness(struct led_classdev *cdev,
+ enum led_brightness value)
+{
+ unsigned int reg, shift_val;
+ struct lp3952_ctrl_hdl *led = container_of(cdev,
+ struct lp3952_ctrl_hdl,
+ cdev);
+ struct lp3952_led_array *priv = (struct lp3952_led_array *)led->priv;
+
+ dev_dbg(cdev->dev, "Brightness request: %d on %d\n", value,
+ led->channel);
+
+ if (value == LED_OFF) {
+ lp3952_on_off(priv, led->channel, LED_OFF);
+ return 0;
+ }
+
+ if (led->channel > LP3952_RED_1) {
+ dev_err(cdev->dev, " %s Invalid LED requested", __func__);
+ return -EINVAL;
+ }
+
+ if (led->channel >= LP3952_BLUE_1) {
+ reg = LP3952_REG_RGB1_MAX_I_CTRL;
+ shift_val = (led->channel - LP3952_BLUE_1) * 2;
+ } else {
+ reg = LP3952_REG_RGB2_MAX_I_CTRL;
+ shift_val = led->channel * 2;
+ }
+
+ /* Enable the LED in case it is not enabled already */
+ lp3952_on_off(priv, led->channel, 1);
+
+ return regmap_update_bits(priv->regmap, reg, 3 << shift_val,
+ --value << shift_val);
+}
+
+static int lp3952_get_label(struct device *dev, const char *label, char *dest)
+{
+ int ret;
+ const char *str;
+
+ ret = device_property_read_string(dev, label, &str);
+ if (!ret)
+ strncpy(dest, str, LP3952_LABEL_MAX_LEN);
+
+ return ret;
+}
+
+static int lp3952_register_led_classdev(struct lp3952_led_array *priv)
+{
+ int i, acpi_ret, ret = -ENODEV;
+ static const char *led_name_hdl[LP3952_LED_ALL] = {
+ "blue2",
+ "green2",
+ "red2",
+ "blue1",
+ "green1",
+ "red1"
+ };
+
+ for (i = 0; i < LP3952_LED_ALL; i++) {
+ acpi_ret = lp3952_get_label(&priv->client->dev, led_name_hdl[i],
+ priv->leds[i].name);
+ if (acpi_ret)
+ continue;
+
+ priv->leds[i].cdev.name = priv->leds[i].name;
+ priv->leds[i].cdev.brightness = LED_OFF;
+ priv->leds[i].cdev.max_brightness = LP3952_BRIGHT_MAX;
+ priv->leds[i].cdev.brightness_set_blocking =
+ lp3952_set_brightness;
+ priv->leds[i].channel = i;
+ priv->leds[i].priv = priv;
+
+ ret = devm_led_classdev_register(&priv->client->dev,
+ &priv->leds[i].cdev);
+ if (ret < 0) {
+ dev_err(&priv->client->dev,
+ "couldn't register LED %s\n",
+ priv->leds[i].cdev.name);
+ break;
+ }
+ }
+ return ret;
+}
+
+static int lp3952_set_pattern_gen_cmd(struct lp3952_led_array *priv,
+ u8 cmd_index, u8 r, u8 g, u8 b,
+ enum lp3952_tt tt, enum lp3952_cet cet)
+{
+ int ret;
+ struct ptrn_gen_cmd line = {
+ .r = r,
+ .g = g,
+ .b = b,
+ .cet = cet,
+ .tt = tt
+ };
+
+ if (cmd_index >= LP3952_CMD_REG_COUNT)
+ return -EINVAL;
+
+ ret = lp3952_register_write(priv->client,
+ LP3952_REG_CMD_0 + cmd_index * 2,
+ line.bytes.msb);
+ if (ret)
+ return ret;
+
+ return (lp3952_register_write(priv->client,
+ LP3952_REG_CMD_0 + cmd_index * 2 + 1,
+ line.bytes.lsb));
+}
+
+static int lp3952_configure(struct lp3952_led_array *priv)
+{
+ int ret;
+
+ /* Disable any LEDs on from any previous conf. */
+ ret = lp3952_register_write(priv->client, LP3952_REG_LED_CTRL, 0);
+ if (ret)
+ return ret;
+
+ /* enable rgb patter, loop */
+ ret = lp3952_register_write(priv->client, LP3952_REG_PAT_GEN_CTRL,
+ LP3952_PATRN_LOOP | LP3952_PATRN_GEN_EN);
+ if (ret)
+ return ret;
+
+ /* Update Bit 6 (Active mode), Select both Led sets, Bit [1:0] */
+ ret = lp3952_register_write(priv->client, LP3952_REG_ENABLES,
+ LP3952_ACTIVE_MODE | LP3952_INT_B00ST_LDR);
+ if (ret)
+ return ret;
+
+ /* Set Cmd1 for RGB intensity,cmd and transition time */
+ return (lp3952_set_pattern_gen_cmd(priv, 0, I46, I71, I100, TT0,
+ CET197));
+}
+
+static const struct regmap_config lp3952_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = REG_MAX,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static int lp3952_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int status;
+ struct lp3952_ctrl_hdl *leds;
+ struct lp3952_led_array *priv;
+
+ priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ leds = devm_kcalloc(&client->dev, LP3952_LED_ALL, sizeof(*leds),
+ GFP_KERNEL);
+ if (!leds) {
+ devm_kfree(&client->dev, priv);
+ return -ENOMEM;
+ }
+
+ priv->leds = leds;
+ priv->client = client;
+
+ priv->enable_gpio = devm_gpiod_get(&client->dev, "nrst",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->enable_gpio)) {
+ status = PTR_ERR(priv->enable_gpio);
+ dev_err(&client->dev, "Failed to enable gpio: %d\n", status);
+ return status;
+ }
+
+ priv->regmap = devm_regmap_init_i2c(client, &lp3952_regmap);
+ if (IS_ERR(priv->regmap)) {
+ int err = PTR_ERR(priv->regmap);
+
+ dev_err(&client->dev, "Failed to allocate register map: %d\n",
+ err);
+ return err;
+ }
+
+ i2c_set_clientdata(client, priv);
+
+ status = lp3952_configure(priv);
+ if (status) {
+ dev_err(&client->dev, "Probe failed. Device not found (%d)\n",
+ status);
+ return status;
+ }
+
+ status = lp3952_register_led_classdev(priv);
+ if (status) {
+ dev_err(&client->dev, "Unable to register led_classdev: %d\n",
+ status);
+ return status;
+ }
+
+ return 0;
+}
+
+static int lp3952_remove(struct i2c_client *client)
+{
+ struct lp3952_led_array *priv;
+
+ priv = i2c_get_clientdata(client);
+ lp3952_on_off(priv, LP3952_LED_ALL, 0);
+ gpiod_set_value(priv->enable_gpio, 0);
+
+ return 0;
+}
+
+static const struct i2c_device_id lp3952_id[] = {
+ {LP3952_NAME, 0},
+ {}
+};
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id lp3952_acpi_match[] = {
+ {"TXNW3952", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(acpi, lp3952_acpi_match);
+#endif
+
+static struct i2c_driver lp3952_i2c_driver = {
+ .driver = {
+ .name = LP3952_NAME,
+ .acpi_match_table = ACPI_PTR(lp3952_acpi_match),
+ },
+ .probe = lp3952_probe,
+ .remove = lp3952_remove,
+ .id_table = lp3952_id,
+};
+
+module_i2c_driver(lp3952_i2c_driver);
+
+MODULE_AUTHOR("Tony Makkiel <tony.makkiel@daqri.com>");
+MODULE_DESCRIPTION("lp3952 I2C LED controller driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/leds-lp3952.h b/include/linux/leds-lp3952.h
new file mode 100644
index 0000000..edd5ed6
--- /dev/null
+++ b/include/linux/leds-lp3952.h
@@ -0,0 +1,125 @@
+/*
+ * LED driver for TI lp3952 controller
+ *
+ * Copyright (C) 2016, DAQRI, LLC.
+ * Author: Tony Makkiel <tony.makkiel@daqri.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef LEDS_LP3952_H_
+#define LEDS_LP3952_H_
+
+#define LP3952_NAME "lp3952"
+#define LP3952_CMD_REG_COUNT 8
+#define LP3952_BRIGHT_MAX 4
+#define LP3952_LABEL_MAX_LEN 15
+
+#define LP3952_REG_LED_CTRL 0x00
+#define LP3952_REG_R1_BLNK_TIME_CTRL 0x01
+#define LP3952_REG_R1_BLNK_CYCLE_CTRL 0x02
+#define LP3952_REG_G1_BLNK_TIME_CTRL 0x03
+#define LP3952_REG_G1_BLNK_CYCLE_CTRL 0x04
+#define LP3952_REG_B1_BLNK_TIME_CTRL 0x05
+#define LP3952_REG_B1_BLNK_CYCLE_CTRL 0x06
+#define LP3952_REG_ENABLES 0x0B
+#define LP3952_REG_PAT_GEN_CTRL 0x11
+#define LP3952_REG_RGB1_MAX_I_CTRL 0x12
+#define LP3952_REG_RGB2_MAX_I_CTRL 0x13
+#define LP3952_REG_CMD_0 0x50
+#define LP3952_REG_RESET 0x60
+#define REG_MAX LP3952_REG_RESET
+
+#define LP3952_PATRN_LOOP BIT(1)
+#define LP3952_PATRN_GEN_EN BIT(2)
+#define LP3952_INT_B00ST_LDR BIT(2)
+#define LP3952_ACTIVE_MODE BIT(6)
+#define LP3952_LED_MASK_ALL 0x3f
+
+/* Transition Time in ms */
+enum lp3952_tt {
+ TT0,
+ TT55,
+ TT110,
+ TT221,
+ TT422,
+ TT885,
+ TT1770,
+ TT3539
+};
+
+/* Command Execution Time in ms */
+enum lp3952_cet {
+ CET197,
+ CET393,
+ CET590,
+ CET786,
+ CET1180,
+ CET1376,
+ CET1573,
+ CET1769,
+ CET1966,
+ CET2163,
+ CET2359,
+ CET2556,
+ CET2763,
+ CET2949,
+ CET3146
+};
+
+/* Max Current in % */
+enum lp3952_colour_I_log_0 {
+ I0,
+ I7,
+ I14,
+ I21,
+ I32,
+ I46,
+ I71,
+ I100
+};
+
+enum lp3952_leds {
+ LP3952_BLUE_2,
+ LP3952_GREEN_2,
+ LP3952_RED_2,
+ LP3952_BLUE_1,
+ LP3952_GREEN_1,
+ LP3952_RED_1,
+ LP3952_LED_ALL
+};
+
+struct lp3952_ctrl_hdl {
+ struct led_classdev cdev;
+ char name[LP3952_LABEL_MAX_LEN];
+ enum lp3952_leds channel;
+ void *priv;
+};
+
+struct ptrn_gen_cmd {
+ union {
+ struct {
+ u16 tt:3;
+ u16 b:3;
+ u16 cet:4;
+ u16 g:3;
+ u16 r:3;
+ };
+ struct {
+ u8 lsb;
+ u8 msb;
+ } bytes;
+ };
+} __packed;
+
+struct lp3952_led_array {
+ struct regmap *regmap;
+ struct i2c_client *client;
+ struct gpio_desc *enable_gpio;
+ struct lp3952_ctrl_hdl *leds;
+};
+
+#endif /* LEDS_LP3952_H_ */
--
2.7.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v9 1/1] leds: LED driver for TI LP3952 6-Channel Color LED
2016-07-08 10:37 [PATCH v9 1/1] leds: LED driver for TI LP3952 6-Channel Color LED Tony Makkiel
@ 2016-07-08 19:28 ` Rafael J. Wysocki
2016-07-09 8:08 ` Mika Westerberg
2016-07-11 7:23 ` Jacek Anaszewski
1 sibling, 1 reply; 4+ messages in thread
From: Rafael J. Wysocki @ 2016-07-08 19:28 UTC (permalink / raw)
To: Tony Makkiel, Mika Westerberg
Cc: linux-leds, ACPI Devel Maling List, Jacek Anaszewski, rpurdie,
Rafael J. Wysocki, Len Brown
On Fri, Jul 8, 2016 at 12:37 PM, Tony Makkiel <tony.makkiel@daqri.com> wrote:
> The chip can drive 2 sets of RGB leds. Controller can
> be controlled via PWM, I2C and audio synchronisation.
> This driver uses I2C to communicate with the chip.
>
> Datasheet: http://www.ti.com/lit/gpn/lp3952
>
> Signed-off-by: Tony Makkiel <tony.makkiel@daqri.com>
>From the ACPI perspective, I don't see anything objectionable here.
Mika, do you agree?
Thanks,
Rafael
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v9 1/1] leds: LED driver for TI LP3952 6-Channel Color LED
2016-07-08 19:28 ` Rafael J. Wysocki
@ 2016-07-09 8:08 ` Mika Westerberg
0 siblings, 0 replies; 4+ messages in thread
From: Mika Westerberg @ 2016-07-09 8:08 UTC (permalink / raw)
To: Rafael J. Wysocki
Cc: Tony Makkiel, linux-leds, ACPI Devel Maling List,
Jacek Anaszewski, rpurdie, Rafael J. Wysocki, Len Brown
On Fri, Jul 08, 2016 at 09:28:06PM +0200, Rafael J. Wysocki wrote:
> On Fri, Jul 8, 2016 at 12:37 PM, Tony Makkiel <tony.makkiel@daqri.com> wrote:
> > The chip can drive 2 sets of RGB leds. Controller can
> > be controlled via PWM, I2C and audio synchronisation.
> > This driver uses I2C to communicate with the chip.
> >
> > Datasheet: http://www.ti.com/lit/gpn/lp3952
> >
> > Signed-off-by: Tony Makkiel <tony.makkiel@daqri.com>
>
> >From the ACPI perspective, I don't see anything objectionable here.
>
> Mika, do you agree?
Yes, looks fine to me.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v9 1/1] leds: LED driver for TI LP3952 6-Channel Color LED
2016-07-08 10:37 [PATCH v9 1/1] leds: LED driver for TI LP3952 6-Channel Color LED Tony Makkiel
2016-07-08 19:28 ` Rafael J. Wysocki
@ 2016-07-11 7:23 ` Jacek Anaszewski
1 sibling, 0 replies; 4+ messages in thread
From: Jacek Anaszewski @ 2016-07-11 7:23 UTC (permalink / raw)
To: Tony Makkiel; +Cc: linux-leds, linux-acpi, rpurdie, rjw, lenb, mika.westerberg
Hi Tony,
Thanks for the update. I've noticed two more issues.
On 07/08/2016 12:37 PM, Tony Makkiel wrote:
> The chip can drive 2 sets of RGB leds. Controller can
> be controlled via PWM, I2C and audio synchronisation.
> This driver uses I2C to communicate with the chip.
>
> Datasheet: http://www.ti.com/lit/gpn/lp3952
>
> Signed-off-by: Tony Makkiel <tony.makkiel@daqri.com>
> ---
>
> Changes from v8:
> - Removed macro LP3952_ACPI_NAME.
> - Replaced acpi_dev_get_property with device_property_read_string
> - Skip led class registration if led data couldn't be read from
> ACPI table.
>
>
> drivers/leds/Kconfig | 13 ++
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-lp3952.c | 306 ++++++++++++++++++++++++++++++++++++++++++++
> include/linux/leds-lp3952.h | 125 ++++++++++++++++++
> 4 files changed, 445 insertions(+)
> create mode 100644 drivers/leds/leds-lp3952.c
> create mode 100644 include/linux/leds-lp3952.h
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 5ae2834..0f321f4 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -228,6 +228,19 @@ config LEDS_LP3944
> To compile this driver as a module, choose M here: the
> module will be called leds-lp3944.
>
> +config LEDS_LP3952
> + tristate "LED Support for TI LP3952 2 channel LED driver"
> + depends on LEDS_CLASS
> + depends on I2C
> + depends on ACPI
> + select REGMAP_I2C
Build fails on x86_64 without "select GPIOLIB" here.
> + help
> + This option enables support for LEDs connected to the Texas
> + Instruments LP3952 LED driver.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called leds-lp3952.
> +
> config LEDS_LP55XX_COMMON
> tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
> depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index cb2013d..0684c86 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -26,6 +26,7 @@ obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
> obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o
> obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
> obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
> +obj-$(CONFIG_LEDS_LP3952) += leds-lp3952.o
> obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o
> obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
> obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
> diff --git a/drivers/leds/leds-lp3952.c b/drivers/leds/leds-lp3952.c
> new file mode 100644
> index 0000000..f8ac6ef
> --- /dev/null
> +++ b/drivers/leds/leds-lp3952.c
> @@ -0,0 +1,306 @@
> +/*
> + * LED driver for TI lp3952 controller
> + *
> + * Copyright (C) 2016, DAQRI, LLC.
> + * Author: Tony Makkiel <tony.makkiel@daqri.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/delay.h>
> +#include <linux/gpio.h>
> +#include <linux/i2c.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/leds.h>
> +#include <linux/leds-lp3952.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm.h>
> +#include <linux/reboot.h>
> +#include <linux/regmap.h>
> +
> +static int lp3952_register_write(struct i2c_client *client, u8 reg, u8 val)
> +{
> + int ret;
> + struct lp3952_led_array *priv = i2c_get_clientdata(client);
> +
> + ret = regmap_write(priv->regmap, reg, val);
> +
> + if (ret)
> + dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
> + __func__, reg, val, ret);
> + return ret;
> +}
> +
> +static void lp3952_on_off(struct lp3952_led_array *priv,
> + enum lp3952_leds led_id, int on)
Let's make "on" type bool, and pass true or false in the last
argument.
> +{
> + int ret, val;
> +
> + dev_dbg(&priv->client->dev, "%s LED %d to %d\n", __func__, led_id, on);
> +
> + val = 1 << led_id;
> + if (led_id == LP3952_LED_ALL)
> + val = LP3952_LED_MASK_ALL;
> +
> + ret = regmap_update_bits(priv->regmap, LP3952_REG_LED_CTRL, val,
> + on ? val : 0);
> + if (ret)
> + dev_err(&priv->client->dev, "%s, Error %d\n", __func__, ret);
> +}
> +
> +/*
> + * Using Imax to control brightness. There are 4 possible
> + * setting 25, 50, 75 and 100 % of Imax. Possible values are
> + * values 0-4. 0 meaning turn off.
> + */
> +static int lp3952_set_brightness(struct led_classdev *cdev,
> + enum led_brightness value)
> +{
> + unsigned int reg, shift_val;
> + struct lp3952_ctrl_hdl *led = container_of(cdev,
> + struct lp3952_ctrl_hdl,
> + cdev);
> + struct lp3952_led_array *priv = (struct lp3952_led_array *)led->priv;
> +
> + dev_dbg(cdev->dev, "Brightness request: %d on %d\n", value,
> + led->channel);
> +
> + if (value == LED_OFF) {
> + lp3952_on_off(priv, led->channel, LED_OFF);
> + return 0;
> + }
> +
> + if (led->channel > LP3952_RED_1) {
> + dev_err(cdev->dev, " %s Invalid LED requested", __func__);
> + return -EINVAL;
> + }
> +
> + if (led->channel >= LP3952_BLUE_1) {
> + reg = LP3952_REG_RGB1_MAX_I_CTRL;
> + shift_val = (led->channel - LP3952_BLUE_1) * 2;
> + } else {
> + reg = LP3952_REG_RGB2_MAX_I_CTRL;
> + shift_val = led->channel * 2;
> + }
> +
> + /* Enable the LED in case it is not enabled already */
> + lp3952_on_off(priv, led->channel, 1);
> +
> + return regmap_update_bits(priv->regmap, reg, 3 << shift_val,
> + --value << shift_val);
> +}
> +
> +static int lp3952_get_label(struct device *dev, const char *label, char *dest)
> +{
> + int ret;
> + const char *str;
> +
> + ret = device_property_read_string(dev, label, &str);
> + if (!ret)
> + strncpy(dest, str, LP3952_LABEL_MAX_LEN);
> +
> + return ret;
> +}
> +
> +static int lp3952_register_led_classdev(struct lp3952_led_array *priv)
> +{
> + int i, acpi_ret, ret = -ENODEV;
> + static const char *led_name_hdl[LP3952_LED_ALL] = {
> + "blue2",
> + "green2",
> + "red2",
> + "blue1",
> + "green1",
> + "red1"
> + };
> +
> + for (i = 0; i < LP3952_LED_ALL; i++) {
> + acpi_ret = lp3952_get_label(&priv->client->dev, led_name_hdl[i],
> + priv->leds[i].name);
> + if (acpi_ret)
> + continue;
> +
> + priv->leds[i].cdev.name = priv->leds[i].name;
> + priv->leds[i].cdev.brightness = LED_OFF;
> + priv->leds[i].cdev.max_brightness = LP3952_BRIGHT_MAX;
> + priv->leds[i].cdev.brightness_set_blocking =
> + lp3952_set_brightness;
> + priv->leds[i].channel = i;
> + priv->leds[i].priv = priv;
> +
> + ret = devm_led_classdev_register(&priv->client->dev,
> + &priv->leds[i].cdev);
> + if (ret < 0) {
> + dev_err(&priv->client->dev,
> + "couldn't register LED %s\n",
> + priv->leds[i].cdev.name);
> + break;
> + }
> + }
> + return ret;
> +}
> +
> +static int lp3952_set_pattern_gen_cmd(struct lp3952_led_array *priv,
> + u8 cmd_index, u8 r, u8 g, u8 b,
> + enum lp3952_tt tt, enum lp3952_cet cet)
> +{
> + int ret;
> + struct ptrn_gen_cmd line = {
> + .r = r,
> + .g = g,
> + .b = b,
> + .cet = cet,
> + .tt = tt
> + };
> +
> + if (cmd_index >= LP3952_CMD_REG_COUNT)
> + return -EINVAL;
> +
> + ret = lp3952_register_write(priv->client,
> + LP3952_REG_CMD_0 + cmd_index * 2,
> + line.bytes.msb);
> + if (ret)
> + return ret;
> +
> + return (lp3952_register_write(priv->client,
> + LP3952_REG_CMD_0 + cmd_index * 2 + 1,
> + line.bytes.lsb));
> +}
> +
> +static int lp3952_configure(struct lp3952_led_array *priv)
> +{
> + int ret;
> +
> + /* Disable any LEDs on from any previous conf. */
> + ret = lp3952_register_write(priv->client, LP3952_REG_LED_CTRL, 0);
> + if (ret)
> + return ret;
> +
> + /* enable rgb patter, loop */
> + ret = lp3952_register_write(priv->client, LP3952_REG_PAT_GEN_CTRL,
> + LP3952_PATRN_LOOP | LP3952_PATRN_GEN_EN);
> + if (ret)
> + return ret;
> +
> + /* Update Bit 6 (Active mode), Select both Led sets, Bit [1:0] */
> + ret = lp3952_register_write(priv->client, LP3952_REG_ENABLES,
> + LP3952_ACTIVE_MODE | LP3952_INT_B00ST_LDR);
> + if (ret)
> + return ret;
> +
> + /* Set Cmd1 for RGB intensity,cmd and transition time */
> + return (lp3952_set_pattern_gen_cmd(priv, 0, I46, I71, I100, TT0,
> + CET197));
> +}
> +
> +static const struct regmap_config lp3952_regmap = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = REG_MAX,
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +static int lp3952_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + int status;
> + struct lp3952_ctrl_hdl *leds;
> + struct lp3952_led_array *priv;
> +
> + priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + leds = devm_kcalloc(&client->dev, LP3952_LED_ALL, sizeof(*leds),
> + GFP_KERNEL);
> + if (!leds) {
> + devm_kfree(&client->dev, priv);
> + return -ENOMEM;
> + }
> +
> + priv->leds = leds;
> + priv->client = client;
> +
> + priv->enable_gpio = devm_gpiod_get(&client->dev, "nrst",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(priv->enable_gpio)) {
> + status = PTR_ERR(priv->enable_gpio);
> + dev_err(&client->dev, "Failed to enable gpio: %d\n", status);
> + return status;
> + }
> +
> + priv->regmap = devm_regmap_init_i2c(client, &lp3952_regmap);
> + if (IS_ERR(priv->regmap)) {
> + int err = PTR_ERR(priv->regmap);
> +
> + dev_err(&client->dev, "Failed to allocate register map: %d\n",
> + err);
> + return err;
> + }
> +
> + i2c_set_clientdata(client, priv);
> +
> + status = lp3952_configure(priv);
> + if (status) {
> + dev_err(&client->dev, "Probe failed. Device not found (%d)\n",
> + status);
> + return status;
> + }
> +
> + status = lp3952_register_led_classdev(priv);
> + if (status) {
> + dev_err(&client->dev, "Unable to register led_classdev: %d\n",
> + status);
> + return status;
> + }
> +
> + return 0;
> +}
> +
> +static int lp3952_remove(struct i2c_client *client)
> +{
> + struct lp3952_led_array *priv;
> +
> + priv = i2c_get_clientdata(client);
> + lp3952_on_off(priv, LP3952_LED_ALL, 0);
> + gpiod_set_value(priv->enable_gpio, 0);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id lp3952_id[] = {
> + {LP3952_NAME, 0},
> + {}
> +};
> +
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id lp3952_acpi_match[] = {
> + {"TXNW3952", 0},
> + {}
> +};
> +
> +MODULE_DEVICE_TABLE(acpi, lp3952_acpi_match);
> +#endif
> +
> +static struct i2c_driver lp3952_i2c_driver = {
> + .driver = {
> + .name = LP3952_NAME,
> + .acpi_match_table = ACPI_PTR(lp3952_acpi_match),
> + },
> + .probe = lp3952_probe,
> + .remove = lp3952_remove,
> + .id_table = lp3952_id,
> +};
> +
> +module_i2c_driver(lp3952_i2c_driver);
> +
> +MODULE_AUTHOR("Tony Makkiel <tony.makkiel@daqri.com>");
> +MODULE_DESCRIPTION("lp3952 I2C LED controller driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/leds-lp3952.h b/include/linux/leds-lp3952.h
> new file mode 100644
> index 0000000..edd5ed6
> --- /dev/null
> +++ b/include/linux/leds-lp3952.h
> @@ -0,0 +1,125 @@
> +/*
> + * LED driver for TI lp3952 controller
> + *
> + * Copyright (C) 2016, DAQRI, LLC.
> + * Author: Tony Makkiel <tony.makkiel@daqri.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#ifndef LEDS_LP3952_H_
> +#define LEDS_LP3952_H_
> +
> +#define LP3952_NAME "lp3952"
> +#define LP3952_CMD_REG_COUNT 8
> +#define LP3952_BRIGHT_MAX 4
> +#define LP3952_LABEL_MAX_LEN 15
> +
> +#define LP3952_REG_LED_CTRL 0x00
> +#define LP3952_REG_R1_BLNK_TIME_CTRL 0x01
> +#define LP3952_REG_R1_BLNK_CYCLE_CTRL 0x02
> +#define LP3952_REG_G1_BLNK_TIME_CTRL 0x03
> +#define LP3952_REG_G1_BLNK_CYCLE_CTRL 0x04
> +#define LP3952_REG_B1_BLNK_TIME_CTRL 0x05
> +#define LP3952_REG_B1_BLNK_CYCLE_CTRL 0x06
> +#define LP3952_REG_ENABLES 0x0B
> +#define LP3952_REG_PAT_GEN_CTRL 0x11
> +#define LP3952_REG_RGB1_MAX_I_CTRL 0x12
> +#define LP3952_REG_RGB2_MAX_I_CTRL 0x13
> +#define LP3952_REG_CMD_0 0x50
> +#define LP3952_REG_RESET 0x60
> +#define REG_MAX LP3952_REG_RESET
> +
> +#define LP3952_PATRN_LOOP BIT(1)
> +#define LP3952_PATRN_GEN_EN BIT(2)
> +#define LP3952_INT_B00ST_LDR BIT(2)
> +#define LP3952_ACTIVE_MODE BIT(6)
> +#define LP3952_LED_MASK_ALL 0x3f
> +
> +/* Transition Time in ms */
> +enum lp3952_tt {
> + TT0,
> + TT55,
> + TT110,
> + TT221,
> + TT422,
> + TT885,
> + TT1770,
> + TT3539
> +};
> +
> +/* Command Execution Time in ms */
> +enum lp3952_cet {
> + CET197,
> + CET393,
> + CET590,
> + CET786,
> + CET1180,
> + CET1376,
> + CET1573,
> + CET1769,
> + CET1966,
> + CET2163,
> + CET2359,
> + CET2556,
> + CET2763,
> + CET2949,
> + CET3146
> +};
> +
> +/* Max Current in % */
> +enum lp3952_colour_I_log_0 {
> + I0,
> + I7,
> + I14,
> + I21,
> + I32,
> + I46,
> + I71,
> + I100
> +};
> +
> +enum lp3952_leds {
> + LP3952_BLUE_2,
> + LP3952_GREEN_2,
> + LP3952_RED_2,
> + LP3952_BLUE_1,
> + LP3952_GREEN_1,
> + LP3952_RED_1,
> + LP3952_LED_ALL
> +};
> +
> +struct lp3952_ctrl_hdl {
> + struct led_classdev cdev;
> + char name[LP3952_LABEL_MAX_LEN];
> + enum lp3952_leds channel;
> + void *priv;
> +};
> +
> +struct ptrn_gen_cmd {
> + union {
> + struct {
> + u16 tt:3;
> + u16 b:3;
> + u16 cet:4;
> + u16 g:3;
> + u16 r:3;
> + };
> + struct {
> + u8 lsb;
> + u8 msb;
> + } bytes;
> + };
> +} __packed;
> +
> +struct lp3952_led_array {
> + struct regmap *regmap;
> + struct i2c_client *client;
> + struct gpio_desc *enable_gpio;
> + struct lp3952_ctrl_hdl *leds;
> +};
> +
> +#endif /* LEDS_LP3952_H_ */
>
--
Best regards,
Jacek Anaszewski
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-07-11 7:23 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-07-08 10:37 [PATCH v9 1/1] leds: LED driver for TI LP3952 6-Channel Color LED Tony Makkiel
2016-07-08 19:28 ` Rafael J. Wysocki
2016-07-09 8:08 ` Mika Westerberg
2016-07-11 7:23 ` Jacek Anaszewski
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