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Commit d966c943 authored by Tony Makkiel's avatar Tony Makkiel Committed by Jacek Anaszewski
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leds: LED driver for TI LP3952 6-Channel Color LED 

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: default avatarTony Makkiel <tony.makkiel@daqri.com>
Reviewed-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarAxel Lin <axel.lin@ingics.com>
Signed-off-by: default avatarJacek Anaszewski <j.anaszewski@samsung.com>
parent bff23714

drivers/leds/Kconfig

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Original line number Diff line number Diff line
@@ -228,6 +228,20 @@ 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

	depends on GPIOLIB

	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

drivers/leds/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/leds/leds-lp3952.c

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/*

 *	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, bool 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, false);

		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, true);



	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_led_array *priv;



	priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);

	if (!priv)

		return -ENOMEM;



	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, false);

	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");

include/linux/leds-lp3952.h

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/*

 *	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[LP3952_LED_ALL];

};



#endif /* LEDS_LP3952_H_ */