The TLC59116 is an I2C bus controlled 16-channel LED driver. The
TLC59108 is an I2C bus controlled 8-channel LED driver, which is very
similar to the TLC59116. Each LED output has its own 8-bit
fixed-frequency PWM controller to control the brightness of the LED.
The LEDs can also be fixed off and on, making them suitable for use as
GPOs.
This is based on a driver from Belkin, but has been extensively
rewritten and extended to support both 08 and 16 versions.
Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
Cc: Matthew.Fatheree@xxxxxxxxxx
---
drivers/leds/Kconfig | 8 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-tlc591xx.c | 309 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 318 insertions(+)
create mode 100644 drivers/leds/leds-tlc591xx.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index a6c3d2f153f3..67cba2032543 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_TLC591XX
+ tristate "LED driver for TLC59108 and TLC59116 controllers"
+ depends on LEDS_CLASS && I2C
+ select REGMAP_I2C
+ help
+ This option enables support for Texas Instruments TLC59108
+ and TLC59116 LED controllers.
+
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..0558117a9407 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-$(CONFIG_LEDS_TLC591XX) += leds-tlc591xx.o
obj-$(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-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
new file mode 100644
index 000000000000..531e83f54465
--- /dev/null
+++ b/drivers/leds/leds-tlc591xx.c
@@ -0,0 +1,309 @@
+/*
+ * Copyright 2014 Belkin Inc.
+ * Copyright 2015 Andrew Lunn <andrew@xxxxxxx>
+ *
+ * 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/of_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#define TLC59116_LEDS 16
+#define TLC59108_LEDS 8
+
+#define TLC591XX_REG_MODE1 0x00
+#define MODE1_RESPON_ADDR_MASK 0xF0
+#define MODE1_NORMAL_MODE (0 << 4)
+#define MODE1_SPEED_MODE (1 << 4)
+
+#define TLC591XX_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 TLC591XX_REG_PWM(x) (0x02 + (x))
+
+#define TLC591XX_REG_GRPPWM 0x12
+#define TLC591XX_REG_GRPFREQ 0x13
+
+/* LED Driver Output State, determine the source that drives LED outputs */
+#define LEDOUT_OFF 0x0 /* Output LOW */
+#define LEDOUT_ON 0x1 /* Output HI-Z */
+#define LEDOUT_DIM 0x2 /* Dimming */
+#define LEDOUT_BLINK 0x3 /* Blinking */
+#define LEDOUT_MASK 0x3
+
+#define ldev_to_led(c) container_of(c, struct tlc591xx_led, ldev)
+#define work_to_led(work) container_of(work, struct tlc591xx_led, work)
+
+struct tlc591xx_led {
+ bool active;
+ struct regmap *regmap;
+ unsigned int led_no;
+ struct led_classdev ldev;
+ struct work_struct work;
+ const struct tlc591xx *tlc591xx;
+};
+
+struct tlc591xx_priv {
+ struct tlc591xx_led leds[TLC59116_LEDS];
+};
+
+static int
+tlc59116_reg_ledout(unsigned int led) {
+
+ return (0x14 + (led >> 2));
+}
+
+static int
+tlc59108_reg_ledout(unsigned int led) {
+
+ return (0x0c + (led >> 2));
+}
+
+struct tlc591xx {
+ unsigned int maxleds;
+ int (*reg_ledout)(unsigned int);
+};
+
+static const struct tlc591xx tlc59116 = {
+ .maxleds = TLC59116_LEDS,
+ .reg_ledout = tlc59116_reg_ledout,
+};
+
+static const struct tlc591xx tlc59108 = {
+ .maxleds = TLC59108_LEDS,
+ .reg_ledout = tlc59108_reg_ledout,
+};
+
+static int
+tlc591xx_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, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE);
+ if (err)
+ return err;
+
+ /* Configure MODE2 Reg */
+ val = MODE2_OCH_STOP | mode;
+
+ return regmap_write(regmap, TLC591XX_REG_MODE2, val);
+}
+
+static int
+tlc591xx_set_ledout(struct tlc591xx_led *led, u8 val)
+{
+ struct regmap *regmap = led->regmap;
+ unsigned int i = (led->led_no % 4) * 2;
+ unsigned int addr = led->tlc591xx->reg_ledout(led->led_no);
+ unsigned int mask = LEDOUT_MASK << i;
+
+ val = val << i;
+
+ return regmap_update_bits(regmap, addr, mask, val);
+}
+
+static int
+tlc591xx_set_pwm(struct tlc591xx_led *led, u8 val)
+{
+ struct regmap *regmap = led->regmap;
+ u8 pwm = TLC591XX_REG_PWM(led->led_no);
+
+ return regmap_write(regmap, pwm, led->ldev.brightness);
+}
+
+static void
+tlc591xx_led_work(struct work_struct *work)
+{
+ struct tlc591xx_led *led = work_to_led(work);
+ int err;
+
+ switch (led->ldev.brightness) {
+ case 0:
+ err = tlc591xx_set_ledout(led, LEDOUT_OFF);
+ break;
+ case LED_FULL:
+ err = tlc591xx_set_ledout(led, LEDOUT_ON);
+ break;
+ default:
+ err = tlc591xx_set_ledout(led, LEDOUT_DIM);
+ if (!err)
+ err = tlc591xx_set_pwm(led, led->ldev.brightness);
+ }
+
+ if (err)
+ dev_err(led->ldev.dev, "Failed setting brightness\n");
+}
+
+static void
+tlc591xx_led_set(struct led_classdev *led_cdev, enum led_brightness value)
+{
+ struct tlc591xx_led *led = ldev_to_led(led_cdev);
+
+ led->ldev.brightness = value;
+ schedule_work(&led->work);
+}
+
+static void
+tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
+{
+ int i = j;
+
+ while (--i >= 0) {
+ if (priv->leds[i].active) {
+ led_classdev_unregister(&priv->leds[i].ldev);
+ cancel_work_sync(&priv->leds[i].work);
+ }
+ }
+}
+
+static int
+tlc591xx_configure(struct device *dev,
+ struct tlc591xx_priv *priv,
+ struct regmap *regmap,
+ const struct tlc591xx *tlc591xx)
+{
+ unsigned int i;
+ int err = 0;
+
+ tlc591xx_set_mode(regmap, MODE2_DIM);
+ for (i = 0; i < TLC59116_LEDS; i++) {
+ struct tlc591xx_led *led = &priv->leds[i];
+
+ if (!led->active)
+ continue;
+
+ led->regmap = regmap;
+ led->led_no = i;
+ led->tlc591xx = tlc591xx;
+ led->ldev.brightness_set = tlc591xx_led_set;
+ led->ldev.max_brightness = LED_FULL;
+ INIT_WORK(&led->work, tlc591xx_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;
+ }
+ }
+
+ return 0;
+
+exit:
+ tlc591xx_destroy_devices(priv, i);
+ return err;
+}
+
+static const struct regmap_config tlc591xx_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x1e,
+};
+
+static const struct of_device_id of_tlc591xx_leds_match[] = {
+ { .compatible = "ti,tlc59116",
+ .data = &tlc59116 },
+ { .compatible = "ti,tlc59108",
+ .data = &tlc59108 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match);
+
+static int
+tlc591xx_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device_node *np = client->dev.of_node, *child;
+ struct device *dev = &client->dev;
+ const struct tlc591xx *tlc591xx;
+ struct tlc591xx_priv *priv;
+ struct regmap *regmap;
+ int err, count, reg;
+
+ tlc591xx = of_match_device(of_tlc591xx_leds_match, dev)->data;
+
+ count = of_get_child_count(np);
+ if (!count || count > tlc591xx->maxleds)
+ 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, &tlc591xx_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 >= tlc591xx->maxleds)
+ 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 tlc591xx_configure(dev, priv, regmap, tlc591xx);
+}
+
+static int
+tlc591xx_remove(struct i2c_client *client)
+{
+ struct tlc591xx_priv *priv = i2c_get_clientdata(client);
+
+ tlc591xx_destroy_devices(priv, TLC59116_LEDS);
+
+ return 0;
+}
+
+static const struct i2c_device_id tlc591xx_id[] = {
+ { "tlc59116" },
+ { "tlc59108" },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, tlc591xx_id);
+
+static struct i2c_driver tlc591xx_driver = {
+ .driver = {
+ .name = "tlc591xx",
+ .of_match_table = of_match_ptr(of_tlc591xx_leds_match),
+ },
+ .probe = tlc591xx_probe,
+ .remove = tlc591xx_remove,
+ .id_table = tlc591xx_id,
+};
+
+module_i2c_driver(tlc591xx_driver);
+
+MODULE_AUTHOR("Andrew Lunn <andrew@xxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("TLC591XX LED driver");
--
2.1.4
--
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