--- /dev/null
+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 <andrew@lunn.ch>
+---
+ 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
+@@ -467,6 +467,14 @@ 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
+@@ -31,6 +31,7 @@ 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 <andrew@lunn.ch>
++ *
++ * 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 <linux/i2c.h>
++#include <linux/leds.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/regmap.h>
++#include <linux/slab.h>
++#include <linux/workqueue.h>
++
++#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 <andrew@lunn.ch>");
++MODULE_LICENSE("GPL");
++MODULE_DESCRIPTION("TLC59116 LED driver");
projects / openwrt.git / blobdiff