The TLC59116 is an I2C bus controlled 16-channel LED driver. Each LED output has its own 8-bit fixed-frequency PWM controller to control the brightness of the LED. This is based on a driver from Belkin, but has been extensively rewritten. Signed-off-by: Andrew Lunn --- drivers/leds/Kconfig | 8 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-tlc59116.c | 252 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 261 insertions(+) create mode 100644 drivers/leds/leds-tlc59116.c --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -457,6 +457,14 @@ config LEDS_TCA6507 LED driver chips accessed via the I2C bus. Driver support brightness control and hardware-assisted blinking. +config LEDS_TLC59116 + tristate "LED driver for TLC59116F controllers" + depends on LEDS_CLASS && I2C + select REGMAP_I2C + help + This option enables support for Texas Instruments TLC59116F + LED controller. + config LEDS_MAX8997 tristate "LED support for MAX8997 PMIC" depends on LEDS_CLASS && MFD_MAX8997 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -30,6 +30,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp850 obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o +obj-$(CONFIG_LEDS_TLC59116) += leds-tlc59116.o obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o obj-$(CONFIG_LEDS_IPAQ_MICRO) += leds-ipaq-micro.o obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o --- /dev/null +++ b/drivers/leds/leds-tlc59116.c @@ -0,0 +1,252 @@ +/* + * Copyright 2014 Belkin Inc. + * Copyright 2014 Andrew Lunn + * + * 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; version 2 of the License. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define TLC59116_LEDS 16 + +#define TLC59116_REG_MODE1 0x00 +#define MODE1_RESPON_ADDR_MASK 0xF0 +#define MODE1_NORMAL_MODE (0 << 4) +#define MODE1_SPEED_MODE (1 << 4) + +#define TLC59116_REG_MODE2 0x01 +#define MODE2_DIM (0 << 5) +#define MODE2_BLINK (1 << 5) +#define MODE2_OCH_STOP (0 << 3) +#define MODE2_OCH_ACK (1 << 3) + +#define TLC59116_REG_PWM(x) (0x02 + (x)) + +#define TLC59116_REG_GRPPWM 0x12 +#define TLC59116_REG_GRPFREQ 0x13 + +/* LED Driver Output State, determine the source that drives LED outputs */ +#define TLC59116_REG_LEDOUT(x) (0x14 + ((x) >> 2)) +#define TLC59116_LED_OFF 0x0 /* Output LOW */ +#define TLC59116_LED_ON 0x1 /* Output HI-Z */ +#define TLC59116_DIM 0x2 /* Dimming */ +#define TLC59116_BLINK 0x3 /* Blinking */ +#define LED_MASK 0x3 + +#define ldev_to_led(c) container_of(c, struct tlc59116_led, ldev) +#define work_to_led(work) container_of(work, struct tlc59116_led, work) + +struct tlc59116_led { + bool active; + struct regmap *regmap; + unsigned int led_no; + struct led_classdev ldev; + struct work_struct work; +}; + +struct tlc59116_priv { + struct tlc59116_led leds[TLC59116_LEDS]; +}; + +static int +tlc59116_set_mode(struct regmap *regmap, u8 mode) +{ + int err; + u8 val; + + if ((mode != MODE2_DIM) && (mode != MODE2_BLINK)) + mode = MODE2_DIM; + + /* Configure MODE1 register */ + err = regmap_write(regmap, TLC59116_REG_MODE1, MODE1_NORMAL_MODE); + if (err) + return err; + + /* Configure MODE2 Reg */ + val = MODE2_OCH_STOP | mode; + + return regmap_write(regmap, TLC59116_REG_MODE2, val); +} + +static int +tlc59116_set_led(struct tlc59116_led *led, u8 val) +{ + struct regmap *regmap = led->regmap; + unsigned int i = (led->led_no % 4) * 2; + unsigned int addr = TLC59116_REG_LEDOUT(led->led_no); + unsigned int mask = LED_MASK << i; + + val = val << i; + + return regmap_update_bits(regmap, addr, mask, val); +} + +static void +tlc59116_led_work(struct work_struct *work) +{ + struct tlc59116_led *led = work_to_led(work); + struct regmap *regmap = led->regmap; + int err; + u8 pwm; + + pwm = TLC59116_REG_PWM(led->led_no); + err = regmap_write(regmap, pwm, led->ldev.brightness); + if (err) + dev_err(led->ldev.dev, "Failed setting brightness\n"); +} + +static void +tlc59116_led_set(struct led_classdev *led_cdev, enum led_brightness value) +{ + struct tlc59116_led *led = ldev_to_led(led_cdev); + + led->ldev.brightness = value; + schedule_work(&led->work); +} + +static void +tlc59116_destroy_devices(struct tlc59116_priv *priv, unsigned int i) +{ + while (--i >= 0) { + if (priv->leds[i].active) { + led_classdev_unregister(&priv->leds[i].ldev); + cancel_work_sync(&priv->leds[i].work); + } + } +} + +static int +tlc59116_configure(struct device *dev, + struct tlc59116_priv *priv, + struct regmap *regmap) +{ + unsigned int i; + int err = 0; + + tlc59116_set_mode(regmap, MODE2_DIM); + for (i = 0; i < TLC59116_LEDS; i++) { + struct tlc59116_led *led = &priv->leds[i]; + + if (!led->active) + continue; + + led->regmap = regmap; + led->led_no = i; + led->ldev.brightness_set = tlc59116_led_set; + led->ldev.max_brightness = LED_FULL; + INIT_WORK(&led->work, tlc59116_led_work); + err = led_classdev_register(dev, &led->ldev); + if (err < 0) { + dev_err(dev, "couldn't register LED %s\n", + led->ldev.name); + goto exit; + } + tlc59116_set_led(led, TLC59116_DIM); + } + + return 0; + +exit: + tlc59116_destroy_devices(priv, i); + return err; +} + +static const struct regmap_config tlc59116_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0x1e, +}; + +static int +tlc59116_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tlc59116_priv *priv = i2c_get_clientdata(client); + struct device *dev = &client->dev; + struct device_node *np = client->dev.of_node, *child; + struct regmap *regmap; + int err, count, reg; + + count = of_get_child_count(np); + if (!count || count > TLC59116_LEDS) + return -EINVAL; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + regmap = devm_regmap_init_i2c(client, &tlc59116_regmap); + if (IS_ERR(regmap)) { + err = PTR_ERR(regmap); + dev_err(dev, "Failed to allocate register map: %d\n", err); + return err; + } + + i2c_set_clientdata(client, priv); + + for_each_child_of_node(np, child) { + err = of_property_read_u32(child, "reg", ®); + if (err) + return err; + if (reg < 0 || reg >= TLC59116_LEDS) + return -EINVAL; + if (priv->leds[reg].active) + return -EINVAL; + priv->leds[reg].active = true; + priv->leds[reg].ldev.name = + of_get_property(child, "label", NULL) ? : child->name; + priv->leds[reg].ldev.default_trigger = + of_get_property(child, "linux,default-trigger", NULL); + } + return tlc59116_configure(dev, priv, regmap); +} + +static int +tlc59116_remove(struct i2c_client *client) +{ + struct tlc59116_priv *priv = i2c_get_clientdata(client); + + tlc59116_destroy_devices(priv, TLC59116_LEDS); + + return 0; +} + +static const struct of_device_id of_tlc59116_leds_match[] = { + { .compatible = "ti,tlc59116", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_tlc59116_leds_match); + +static const struct i2c_device_id tlc59116_id[] = { + { "tlc59116" }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, tlc59116_id); + +static struct i2c_driver tlc59116_driver = { + .driver = { + .name = "tlc59116", + .of_match_table = of_match_ptr(of_tlc59116_leds_match), + }, + .probe = tlc59116_probe, + .remove = tlc59116_remove, + .id_table = tlc59116_id, +}; + +module_i2c_driver(tlc59116_driver); + +MODULE_AUTHOR("Andrew Lunn "); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("TLC59116 LED driver");