[PATCH 2/2] leds: tlc59116: Driver for the TI 16 Channel i2c LED driver
Bryan Wu
cooloney at gmail.com
Thu Jan 8 17:26:54 PST 2015
On Thu, Jan 8, 2015 at 4:26 PM, Andrew Lunn <andrew at lunn.ch> wrote:
> 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 at lunn.ch>
> Cc: Matthew.Fatheree at belkin.com
> ---
> drivers/leds/Kconfig | 7 ++
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-tlc59116.c | 253 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 261 insertions(+)
> create mode 100644 drivers/leds/leds-tlc59116.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index a6c3d2f153f3..06a24ec60a27 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -457,6 +457,13 @@ 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
> + 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
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 1c65a191d907..8e7d20acfa7b 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -30,6 +30,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o
> obj-$(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
> diff --git a/drivers/leds/leds-tlc59116.c b/drivers/leds/leds-tlc59116.c
> new file mode 100644
> index 000000000000..377479af1ba4
> --- /dev/null
> +++ b/drivers/leds/leds-tlc59116.c
> @@ -0,0 +1,253 @@
> +/*
> + * Copyright 2014 Belkin Inc.
> + * Copyright 2014 Andrew Lunn <andrew at 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/module.h>
> +#include <linux/i2c.h>
> +#include <linux/leds.h>
> +#include <linux/of.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/workqueue.h>
> +
Please make this list in alphabetic sequence.
> +#define TLC59116_LEDS 16
> +
> +#define TLC59116_REG_MODE1 0x00 /* Mode register 0 */
> +#define MODE1_RESPON_ADDR_MASK 0xF0
> +#define MODE1_NORMAL_MODE (0 << 4)
> +#define MODE1_SPEED_MODE (1 << 4)
> +
> +#define TLC59116_REG_MODE2 0x01 /* Mode register 1 */
> +#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;
> + 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, uint8_t mode)
Why not just us u8 instead of uint8_t?
> +{
> + uint8_t val = 0;
> +
> + if ((mode != MODE2_DIM) && (mode != MODE2_BLINK))
> + mode = MODE2_DIM;
> +
> + /* Configure MODE1 register */
> + val &= 0x0;
You don't need this, since val = 0 from beginning.
> + val &= MODE1_RESPON_ADDR_MASK;
> + val |= MODE1_NORMAL_MODE;
> + regmap_write(regmap, TLC59116_REG_MODE1, val);
> +
Need we check the return status of regmap_write()?
> + /* Configure MODE2 Reg */
> + val &= 0x00;
> + val |= MODE2_OCH_STOP;
> +
> + val |= mode;
> +
> + regmap_write(regmap, TLC59116_REG_MODE2, val);
> +
> + return 0;
> +}
> +
> +static int
> +tlc59116_set_led(struct tlc59116_led *led, uint8_t val)
> +{
> + struct regmap *regmap = led->regmap;
> + int i = (led->led_no % 4) * 2;
> + char 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;
> + uint8_t pwm;
> +
> + pwm = TLC59116_REG_PWM(led->led_no);
> + regmap_write(regmap, pwm, led->ldev.brightness);
> +}
> +
> +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, 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)
> +{
> + int i, 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", },
> + {},
> +};
> +
> +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 at lunn.ch>");
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("TLC59116 LED driver");
> --
> 2.1.3
>
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