[PATCHv2 2/2] leds: tlc59116: Driver for the TI 16 Channel i2c LED driver
Andrew Lunn
andrew at lunn.ch
Fri Jan 9 14:45:45 PST 2015
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 | 8 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-tlc59116.c | 252 +++++++++++++++++++++++++++++++++++++++++++
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..8fc283c01673 100644
--- 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
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..9ed8175e7992
--- /dev/null
+++ b/drivers/leds/leds-tlc59116.c
@@ -0,0 +1,252 @@
+/*
+ * 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/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 /* 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, u8 mode)
+{
+ u8 val = 0;
+ int err;
+
+ 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;
+ val |= 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;
+ 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;
+ 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, 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", },
+ {},
+};
+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 at lunn.ch>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("TLC59116 LED driver");
--
2.1.3
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