1b886d83cSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2e370d010SAndrew Lunn /*
3e370d010SAndrew Lunn * Copyright 2014 Belkin Inc.
4e370d010SAndrew Lunn * Copyright 2015 Andrew Lunn <andrew@lunn.ch>
5e370d010SAndrew Lunn */
6e370d010SAndrew Lunn
7e370d010SAndrew Lunn #include <linux/i2c.h>
8e370d010SAndrew Lunn #include <linux/leds.h>
9e370d010SAndrew Lunn #include <linux/module.h>
10e370d010SAndrew Lunn #include <linux/of.h>
11e370d010SAndrew Lunn #include <linux/regmap.h>
12e370d010SAndrew Lunn #include <linux/slab.h>
13e370d010SAndrew Lunn
14e370d010SAndrew Lunn #define TLC591XX_MAX_LEDS 16
15a2cafdfdSJean-Jacques Hiblot #define TLC591XX_MAX_BRIGHTNESS 256
16e370d010SAndrew Lunn
17e370d010SAndrew Lunn #define TLC591XX_REG_MODE1 0x00
18e370d010SAndrew Lunn #define MODE1_RESPON_ADDR_MASK 0xF0
19e370d010SAndrew Lunn #define MODE1_NORMAL_MODE (0 << 4)
20e370d010SAndrew Lunn #define MODE1_SPEED_MODE (1 << 4)
21e370d010SAndrew Lunn
22e370d010SAndrew Lunn #define TLC591XX_REG_MODE2 0x01
23e370d010SAndrew Lunn #define MODE2_DIM (0 << 5)
24e370d010SAndrew Lunn #define MODE2_BLINK (1 << 5)
25e370d010SAndrew Lunn #define MODE2_OCH_STOP (0 << 3)
26e370d010SAndrew Lunn #define MODE2_OCH_ACK (1 << 3)
27e370d010SAndrew Lunn
28e370d010SAndrew Lunn #define TLC591XX_REG_PWM(x) (0x02 + (x))
29e370d010SAndrew Lunn
30e370d010SAndrew Lunn #define TLC591XX_REG_GRPPWM 0x12
31e370d010SAndrew Lunn #define TLC591XX_REG_GRPFREQ 0x13
32e370d010SAndrew Lunn
33e370d010SAndrew Lunn /* LED Driver Output State, determine the source that drives LED outputs */
34e370d010SAndrew Lunn #define LEDOUT_OFF 0x0 /* Output LOW */
35e370d010SAndrew Lunn #define LEDOUT_ON 0x1 /* Output HI-Z */
36e370d010SAndrew Lunn #define LEDOUT_DIM 0x2 /* Dimming */
37e370d010SAndrew Lunn #define LEDOUT_BLINK 0x3 /* Blinking */
38e370d010SAndrew Lunn #define LEDOUT_MASK 0x3
39e370d010SAndrew Lunn
40e370d010SAndrew Lunn #define ldev_to_led(c) container_of(c, struct tlc591xx_led, ldev)
41e370d010SAndrew Lunn
42e370d010SAndrew Lunn struct tlc591xx_led {
43e370d010SAndrew Lunn bool active;
44e370d010SAndrew Lunn unsigned int led_no;
45e370d010SAndrew Lunn struct led_classdev ldev;
46e370d010SAndrew Lunn struct tlc591xx_priv *priv;
47e370d010SAndrew Lunn };
48e370d010SAndrew Lunn
49e370d010SAndrew Lunn struct tlc591xx_priv {
50e370d010SAndrew Lunn struct tlc591xx_led leds[TLC591XX_MAX_LEDS];
51e370d010SAndrew Lunn struct regmap *regmap;
52e370d010SAndrew Lunn unsigned int reg_ledout_offset;
53e370d010SAndrew Lunn };
54e370d010SAndrew Lunn
55e370d010SAndrew Lunn struct tlc591xx {
56e370d010SAndrew Lunn unsigned int max_leds;
57e370d010SAndrew Lunn unsigned int reg_ledout_offset;
58e370d010SAndrew Lunn };
59e370d010SAndrew Lunn
60e370d010SAndrew Lunn static const struct tlc591xx tlc59116 = {
61e370d010SAndrew Lunn .max_leds = 16,
62e370d010SAndrew Lunn .reg_ledout_offset = 0x14,
63e370d010SAndrew Lunn };
64e370d010SAndrew Lunn
65e370d010SAndrew Lunn static const struct tlc591xx tlc59108 = {
66e370d010SAndrew Lunn .max_leds = 8,
67e370d010SAndrew Lunn .reg_ledout_offset = 0x0c,
68e370d010SAndrew Lunn };
69e370d010SAndrew Lunn
70e370d010SAndrew Lunn static int
tlc591xx_set_mode(struct regmap * regmap,u8 mode)71e370d010SAndrew Lunn tlc591xx_set_mode(struct regmap *regmap, u8 mode)
72e370d010SAndrew Lunn {
73e370d010SAndrew Lunn int err;
74e370d010SAndrew Lunn u8 val;
75e370d010SAndrew Lunn
76e370d010SAndrew Lunn err = regmap_write(regmap, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE);
77e370d010SAndrew Lunn if (err)
78e370d010SAndrew Lunn return err;
79e370d010SAndrew Lunn
80e370d010SAndrew Lunn val = MODE2_OCH_STOP | mode;
81e370d010SAndrew Lunn
82e370d010SAndrew Lunn return regmap_write(regmap, TLC591XX_REG_MODE2, val);
83e370d010SAndrew Lunn }
84e370d010SAndrew Lunn
85e370d010SAndrew Lunn static int
tlc591xx_set_ledout(struct tlc591xx_priv * priv,struct tlc591xx_led * led,u8 val)86e370d010SAndrew Lunn tlc591xx_set_ledout(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
87e370d010SAndrew Lunn u8 val)
88e370d010SAndrew Lunn {
89e370d010SAndrew Lunn unsigned int i = (led->led_no % 4) * 2;
90e370d010SAndrew Lunn unsigned int mask = LEDOUT_MASK << i;
91e370d010SAndrew Lunn unsigned int addr = priv->reg_ledout_offset + (led->led_no >> 2);
92e370d010SAndrew Lunn
93e370d010SAndrew Lunn val = val << i;
94e370d010SAndrew Lunn
95e370d010SAndrew Lunn return regmap_update_bits(priv->regmap, addr, mask, val);
96e370d010SAndrew Lunn }
97e370d010SAndrew Lunn
98e370d010SAndrew Lunn static int
tlc591xx_set_pwm(struct tlc591xx_priv * priv,struct tlc591xx_led * led,u8 brightness)99e370d010SAndrew Lunn tlc591xx_set_pwm(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
100e370d010SAndrew Lunn u8 brightness)
101e370d010SAndrew Lunn {
102e370d010SAndrew Lunn u8 pwm = TLC591XX_REG_PWM(led->led_no);
103e370d010SAndrew Lunn
104e370d010SAndrew Lunn return regmap_write(priv->regmap, pwm, brightness);
105e370d010SAndrew Lunn }
106e370d010SAndrew Lunn
107d890389fSAndrew Lunn static int
tlc591xx_brightness_set(struct led_classdev * led_cdev,enum led_brightness brightness)108d890389fSAndrew Lunn tlc591xx_brightness_set(struct led_classdev *led_cdev,
109d890389fSAndrew Lunn enum led_brightness brightness)
110e370d010SAndrew Lunn {
111d890389fSAndrew Lunn struct tlc591xx_led *led = ldev_to_led(led_cdev);
112e370d010SAndrew Lunn struct tlc591xx_priv *priv = led->priv;
113e370d010SAndrew Lunn int err;
114e370d010SAndrew Lunn
115a2cafdfdSJean-Jacques Hiblot switch ((int)brightness) {
116e370d010SAndrew Lunn case 0:
117e370d010SAndrew Lunn err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF);
118e370d010SAndrew Lunn break;
119a2cafdfdSJean-Jacques Hiblot case TLC591XX_MAX_BRIGHTNESS:
120e370d010SAndrew Lunn err = tlc591xx_set_ledout(priv, led, LEDOUT_ON);
121e370d010SAndrew Lunn break;
122e370d010SAndrew Lunn default:
123e370d010SAndrew Lunn err = tlc591xx_set_ledout(priv, led, LEDOUT_DIM);
124e370d010SAndrew Lunn if (!err)
125e370d010SAndrew Lunn err = tlc591xx_set_pwm(priv, led, brightness);
126e370d010SAndrew Lunn }
127e370d010SAndrew Lunn
128d890389fSAndrew Lunn return err;
129e370d010SAndrew Lunn }
130e370d010SAndrew Lunn
131e370d010SAndrew Lunn static const struct regmap_config tlc591xx_regmap = {
132e370d010SAndrew Lunn .reg_bits = 8,
133e370d010SAndrew Lunn .val_bits = 8,
134e370d010SAndrew Lunn .max_register = 0x1e,
135e370d010SAndrew Lunn };
136e370d010SAndrew Lunn
137e0248a25SKrzysztof Kozlowski static const struct of_device_id of_tlc591xx_leds_match[] __maybe_unused = {
138e370d010SAndrew Lunn { .compatible = "ti,tlc59116",
139e370d010SAndrew Lunn .data = &tlc59116 },
140e370d010SAndrew Lunn { .compatible = "ti,tlc59108",
141e370d010SAndrew Lunn .data = &tlc59108 },
142e370d010SAndrew Lunn {},
143e370d010SAndrew Lunn };
144e370d010SAndrew Lunn MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match);
145e370d010SAndrew Lunn
146e370d010SAndrew Lunn static int
tlc591xx_probe(struct i2c_client * client)147cef9efd5SUwe Kleine-König tlc591xx_probe(struct i2c_client *client)
148e370d010SAndrew Lunn {
149*8d89afc6SMarilene A Garcia struct device_node *np;
150e370d010SAndrew Lunn struct device *dev = &client->dev;
151e370d010SAndrew Lunn const struct tlc591xx *tlc591xx;
152e370d010SAndrew Lunn struct tlc591xx_priv *priv;
153e370d010SAndrew Lunn int err, count, reg;
154e370d010SAndrew Lunn
155ee522bcfSYang Yingliang np = dev_of_node(dev);
156e370d010SAndrew Lunn if (!np)
157e370d010SAndrew Lunn return -ENODEV;
158e370d010SAndrew Lunn
159ee522bcfSYang Yingliang tlc591xx = device_get_match_data(dev);
160ee522bcfSYang Yingliang if (!tlc591xx)
161ee522bcfSYang Yingliang return -ENODEV;
162ee522bcfSYang Yingliang
16399a013c8SMarek Behún count = of_get_available_child_count(np);
164e370d010SAndrew Lunn if (!count || count > tlc591xx->max_leds)
165e370d010SAndrew Lunn return -EINVAL;
166e370d010SAndrew Lunn
167e370d010SAndrew Lunn priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
168e370d010SAndrew Lunn if (!priv)
169e370d010SAndrew Lunn return -ENOMEM;
170e370d010SAndrew Lunn
171e370d010SAndrew Lunn priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap);
172e370d010SAndrew Lunn if (IS_ERR(priv->regmap)) {
173e370d010SAndrew Lunn err = PTR_ERR(priv->regmap);
174e370d010SAndrew Lunn dev_err(dev, "Failed to allocate register map: %d\n", err);
175e370d010SAndrew Lunn return err;
176e370d010SAndrew Lunn }
177e370d010SAndrew Lunn priv->reg_ledout_offset = tlc591xx->reg_ledout_offset;
178e370d010SAndrew Lunn
179e370d010SAndrew Lunn i2c_set_clientdata(client, priv);
180e370d010SAndrew Lunn
1811ab4531aSJean-Jacques Hiblot err = tlc591xx_set_mode(priv->regmap, MODE2_DIM);
1821ab4531aSJean-Jacques Hiblot if (err < 0)
1831ab4531aSJean-Jacques Hiblot return err;
1841ab4531aSJean-Jacques Hiblot
185*8d89afc6SMarilene A Garcia for_each_available_child_of_node_scoped(np, child) {
1861ab4531aSJean-Jacques Hiblot struct tlc591xx_led *led;
1875b4b723cSJean-Jacques Hiblot struct led_init_data init_data = {};
1885b4b723cSJean-Jacques Hiblot
1895b4b723cSJean-Jacques Hiblot init_data.fwnode = of_fwnode_handle(child);
1901ab4531aSJean-Jacques Hiblot
191e370d010SAndrew Lunn err = of_property_read_u32(child, "reg", ®);
192*8d89afc6SMarilene A Garcia if (err)
193e370d010SAndrew Lunn return err;
194*8d89afc6SMarilene A Garcia
1951055790bSJulia Lawall if (reg < 0 || reg >= tlc591xx->max_leds ||
196*8d89afc6SMarilene A Garcia priv->leds[reg].active)
197e370d010SAndrew Lunn return -EINVAL;
198*8d89afc6SMarilene A Garcia
1991ab4531aSJean-Jacques Hiblot led = &priv->leds[reg];
2001ab4531aSJean-Jacques Hiblot
2011ab4531aSJean-Jacques Hiblot led->active = true;
2021ab4531aSJean-Jacques Hiblot led->priv = priv;
2031ab4531aSJean-Jacques Hiblot led->led_no = reg;
2041ab4531aSJean-Jacques Hiblot led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
205a2cafdfdSJean-Jacques Hiblot led->ldev.max_brightness = TLC591XX_MAX_BRIGHTNESS;
2065b4b723cSJean-Jacques Hiblot err = devm_led_classdev_register_ext(dev, &led->ldev,
2075b4b723cSJean-Jacques Hiblot &init_data);
208*8d89afc6SMarilene A Garcia if (err < 0)
20903eb2ca4SKrzysztof Kozlowski return dev_err_probe(dev, err,
21003eb2ca4SKrzysztof Kozlowski "couldn't register LED %s\n",
2111ab4531aSJean-Jacques Hiblot led->ldev.name);
212e370d010SAndrew Lunn }
213e370d010SAndrew Lunn return 0;
214e370d010SAndrew Lunn }
215e370d010SAndrew Lunn
216e370d010SAndrew Lunn static const struct i2c_device_id tlc591xx_id[] = {
217e370d010SAndrew Lunn { "tlc59116" },
218e370d010SAndrew Lunn { "tlc59108" },
219e370d010SAndrew Lunn {},
220e370d010SAndrew Lunn };
221e370d010SAndrew Lunn MODULE_DEVICE_TABLE(i2c, tlc591xx_id);
222e370d010SAndrew Lunn
223e370d010SAndrew Lunn static struct i2c_driver tlc591xx_driver = {
224e370d010SAndrew Lunn .driver = {
225e370d010SAndrew Lunn .name = "tlc591xx",
226e370d010SAndrew Lunn .of_match_table = of_match_ptr(of_tlc591xx_leds_match),
227e370d010SAndrew Lunn },
228d9ff8a8eSUwe Kleine-König .probe = tlc591xx_probe,
229e370d010SAndrew Lunn .id_table = tlc591xx_id,
230e370d010SAndrew Lunn };
231e370d010SAndrew Lunn
232e370d010SAndrew Lunn module_i2c_driver(tlc591xx_driver);
233e370d010SAndrew Lunn
234e370d010SAndrew Lunn MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
235e370d010SAndrew Lunn MODULE_LICENSE("GPL");
236e370d010SAndrew Lunn MODULE_DESCRIPTION("TLC591XX LED driver");
237