1 The TLC59116 is an I2C bus controlled 16-channel LED driver. Each LED
2 output has its own 8-bit fixed-frequency PWM controller to control the
5 This is based on a driver from Belkin, but has been extensively
8 Signed-off-by: Andrew Lunn <andrew@lunn.ch>
10 drivers/leds/Kconfig | 8 ++
11 drivers/leds/Makefile | 1 +
12 drivers/leds/leds-tlc59116.c | 252 +++++++++++++++++++++++++++++++++++++++++++
13 3 files changed, 261 insertions(+)
14 create mode 100644 drivers/leds/leds-tlc59116.c
16 --- a/drivers/leds/Kconfig
17 +++ b/drivers/leds/Kconfig
18 @@ -457,6 +457,14 @@ config LEDS_TCA6507
19 LED driver chips accessed via the I2C bus.
20 Driver support brightness control and hardware-assisted blinking.
23 + tristate "LED driver for TLC59116F controllers"
24 + depends on LEDS_CLASS && I2C
27 + This option enables support for Texas Instruments TLC59116F
31 tristate "LED support for MAX8997 PMIC"
32 depends on LEDS_CLASS && MFD_MAX8997
33 --- a/drivers/leds/Makefile
34 +++ b/drivers/leds/Makefile
35 @@ -30,6 +30,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp850
36 obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
37 obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o
38 obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o
39 +obj-$(CONFIG_LEDS_TLC59116) += leds-tlc59116.o
40 obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
41 obj-$(CONFIG_LEDS_IPAQ_MICRO) += leds-ipaq-micro.o
42 obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
44 +++ b/drivers/leds/leds-tlc59116.c
47 + * Copyright 2014 Belkin Inc.
48 + * Copyright 2014 Andrew Lunn <andrew@lunn.ch>
50 + * This program is free software; you can redistribute it and/or modify
51 + * it under the terms of the GNU General Public License as published by
52 + * the Free Software Foundation; version 2 of the License.
55 +#include <linux/i2c.h>
56 +#include <linux/leds.h>
57 +#include <linux/module.h>
58 +#include <linux/of.h>
59 +#include <linux/regmap.h>
60 +#include <linux/slab.h>
61 +#include <linux/workqueue.h>
63 +#define TLC59116_LEDS 16
65 +#define TLC59116_REG_MODE1 0x00
66 +#define MODE1_RESPON_ADDR_MASK 0xF0
67 +#define MODE1_NORMAL_MODE (0 << 4)
68 +#define MODE1_SPEED_MODE (1 << 4)
70 +#define TLC59116_REG_MODE2 0x01
71 +#define MODE2_DIM (0 << 5)
72 +#define MODE2_BLINK (1 << 5)
73 +#define MODE2_OCH_STOP (0 << 3)
74 +#define MODE2_OCH_ACK (1 << 3)
76 +#define TLC59116_REG_PWM(x) (0x02 + (x))
78 +#define TLC59116_REG_GRPPWM 0x12
79 +#define TLC59116_REG_GRPFREQ 0x13
81 +/* LED Driver Output State, determine the source that drives LED outputs */
82 +#define TLC59116_REG_LEDOUT(x) (0x14 + ((x) >> 2))
83 +#define TLC59116_LED_OFF 0x0 /* Output LOW */
84 +#define TLC59116_LED_ON 0x1 /* Output HI-Z */
85 +#define TLC59116_DIM 0x2 /* Dimming */
86 +#define TLC59116_BLINK 0x3 /* Blinking */
89 +#define ldev_to_led(c) container_of(c, struct tlc59116_led, ldev)
90 +#define work_to_led(work) container_of(work, struct tlc59116_led, work)
92 +struct tlc59116_led {
94 + struct regmap *regmap;
95 + unsigned int led_no;
96 + struct led_classdev ldev;
97 + struct work_struct work;
100 +struct tlc59116_priv {
101 + struct tlc59116_led leds[TLC59116_LEDS];
105 +tlc59116_set_mode(struct regmap *regmap, u8 mode)
110 + if ((mode != MODE2_DIM) && (mode != MODE2_BLINK))
113 + /* Configure MODE1 register */
114 + err = regmap_write(regmap, TLC59116_REG_MODE1, MODE1_NORMAL_MODE);
118 + /* Configure MODE2 Reg */
119 + val = MODE2_OCH_STOP | mode;
121 + return regmap_write(regmap, TLC59116_REG_MODE2, val);
125 +tlc59116_set_led(struct tlc59116_led *led, u8 val)
127 + struct regmap *regmap = led->regmap;
128 + unsigned int i = (led->led_no % 4) * 2;
129 + unsigned int addr = TLC59116_REG_LEDOUT(led->led_no);
130 + unsigned int mask = LED_MASK << i;
134 + return regmap_update_bits(regmap, addr, mask, val);
138 +tlc59116_led_work(struct work_struct *work)
140 + struct tlc59116_led *led = work_to_led(work);
141 + struct regmap *regmap = led->regmap;
145 + pwm = TLC59116_REG_PWM(led->led_no);
146 + err = regmap_write(regmap, pwm, led->ldev.brightness);
148 + dev_err(led->ldev.dev, "Failed setting brightness\n");
152 +tlc59116_led_set(struct led_classdev *led_cdev, enum led_brightness value)
154 + struct tlc59116_led *led = ldev_to_led(led_cdev);
156 + led->ldev.brightness = value;
157 + schedule_work(&led->work);
161 +tlc59116_destroy_devices(struct tlc59116_priv *priv, unsigned int i)
164 + if (priv->leds[i].active) {
165 + led_classdev_unregister(&priv->leds[i].ldev);
166 + cancel_work_sync(&priv->leds[i].work);
172 +tlc59116_configure(struct device *dev,
173 + struct tlc59116_priv *priv,
174 + struct regmap *regmap)
179 + tlc59116_set_mode(regmap, MODE2_DIM);
180 + for (i = 0; i < TLC59116_LEDS; i++) {
181 + struct tlc59116_led *led = &priv->leds[i];
186 + led->regmap = regmap;
188 + led->ldev.brightness_set = tlc59116_led_set;
189 + led->ldev.max_brightness = LED_FULL;
190 + INIT_WORK(&led->work, tlc59116_led_work);
191 + err = led_classdev_register(dev, &led->ldev);
193 + dev_err(dev, "couldn't register LED %s\n",
197 + tlc59116_set_led(led, TLC59116_DIM);
203 + tlc59116_destroy_devices(priv, i);
207 +static const struct regmap_config tlc59116_regmap = {
210 + .max_register = 0x1e,
214 +tlc59116_probe(struct i2c_client *client,
215 + const struct i2c_device_id *id)
217 + struct tlc59116_priv *priv = i2c_get_clientdata(client);
218 + struct device *dev = &client->dev;
219 + struct device_node *np = client->dev.of_node, *child;
220 + struct regmap *regmap;
221 + int err, count, reg;
223 + count = of_get_child_count(np);
224 + if (!count || count > TLC59116_LEDS)
227 + if (!i2c_check_functionality(client->adapter,
228 + I2C_FUNC_SMBUS_BYTE_DATA))
231 + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
235 + regmap = devm_regmap_init_i2c(client, &tlc59116_regmap);
236 + if (IS_ERR(regmap)) {
237 + err = PTR_ERR(regmap);
238 + dev_err(dev, "Failed to allocate register map: %d\n", err);
242 + i2c_set_clientdata(client, priv);
244 + for_each_child_of_node(np, child) {
245 + err = of_property_read_u32(child, "reg", ®);
248 + if (reg < 0 || reg >= TLC59116_LEDS)
250 + if (priv->leds[reg].active)
252 + priv->leds[reg].active = true;
253 + priv->leds[reg].ldev.name =
254 + of_get_property(child, "label", NULL) ? : child->name;
255 + priv->leds[reg].ldev.default_trigger =
256 + of_get_property(child, "linux,default-trigger", NULL);
258 + return tlc59116_configure(dev, priv, regmap);
262 +tlc59116_remove(struct i2c_client *client)
264 + struct tlc59116_priv *priv = i2c_get_clientdata(client);
266 + tlc59116_destroy_devices(priv, TLC59116_LEDS);
271 +static const struct of_device_id of_tlc59116_leds_match[] = {
272 + { .compatible = "ti,tlc59116", },
275 +MODULE_DEVICE_TABLE(of, of_tlc59116_leds_match);
277 +static const struct i2c_device_id tlc59116_id[] = {
281 +MODULE_DEVICE_TABLE(i2c, tlc59116_id);
283 +static struct i2c_driver tlc59116_driver = {
285 + .name = "tlc59116",
286 + .of_match_table = of_match_ptr(of_tlc59116_leds_match),
288 + .probe = tlc59116_probe,
289 + .remove = tlc59116_remove,
290 + .id_table = tlc59116_id,
293 +module_i2c_driver(tlc59116_driver);
295 +MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
296 +MODULE_LICENSE("GPL");
297 +MODULE_DESCRIPTION("TLC59116 LED driver");