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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e370d010 AL |
2 | /* |
3 | * Copyright 2014 Belkin Inc. | |
4 | * Copyright 2015 Andrew Lunn <andrew@lunn.ch> | |
e370d010 AL |
5 | */ |
6 | ||
7 | #include <linux/i2c.h> | |
8 | #include <linux/leds.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/of.h> | |
11 | #include <linux/of_device.h> | |
12 | #include <linux/regmap.h> | |
13 | #include <linux/slab.h> | |
e370d010 AL |
14 | |
15 | #define TLC591XX_MAX_LEDS 16 | |
a2cafdfd | 16 | #define TLC591XX_MAX_BRIGHTNESS 256 |
e370d010 AL |
17 | |
18 | #define TLC591XX_REG_MODE1 0x00 | |
19 | #define MODE1_RESPON_ADDR_MASK 0xF0 | |
20 | #define MODE1_NORMAL_MODE (0 << 4) | |
21 | #define MODE1_SPEED_MODE (1 << 4) | |
22 | ||
23 | #define TLC591XX_REG_MODE2 0x01 | |
24 | #define MODE2_DIM (0 << 5) | |
25 | #define MODE2_BLINK (1 << 5) | |
26 | #define MODE2_OCH_STOP (0 << 3) | |
27 | #define MODE2_OCH_ACK (1 << 3) | |
28 | ||
29 | #define TLC591XX_REG_PWM(x) (0x02 + (x)) | |
30 | ||
31 | #define TLC591XX_REG_GRPPWM 0x12 | |
32 | #define TLC591XX_REG_GRPFREQ 0x13 | |
33 | ||
34 | /* LED Driver Output State, determine the source that drives LED outputs */ | |
35 | #define LEDOUT_OFF 0x0 /* Output LOW */ | |
36 | #define LEDOUT_ON 0x1 /* Output HI-Z */ | |
37 | #define LEDOUT_DIM 0x2 /* Dimming */ | |
38 | #define LEDOUT_BLINK 0x3 /* Blinking */ | |
39 | #define LEDOUT_MASK 0x3 | |
40 | ||
41 | #define ldev_to_led(c) container_of(c, struct tlc591xx_led, ldev) | |
e370d010 AL |
42 | |
43 | struct tlc591xx_led { | |
44 | bool active; | |
45 | unsigned int led_no; | |
46 | struct led_classdev ldev; | |
e370d010 AL |
47 | struct tlc591xx_priv *priv; |
48 | }; | |
49 | ||
50 | struct tlc591xx_priv { | |
51 | struct tlc591xx_led leds[TLC591XX_MAX_LEDS]; | |
52 | struct regmap *regmap; | |
53 | unsigned int reg_ledout_offset; | |
54 | }; | |
55 | ||
56 | struct tlc591xx { | |
57 | unsigned int max_leds; | |
58 | unsigned int reg_ledout_offset; | |
59 | }; | |
60 | ||
61 | static const struct tlc591xx tlc59116 = { | |
62 | .max_leds = 16, | |
63 | .reg_ledout_offset = 0x14, | |
64 | }; | |
65 | ||
66 | static const struct tlc591xx tlc59108 = { | |
67 | .max_leds = 8, | |
68 | .reg_ledout_offset = 0x0c, | |
69 | }; | |
70 | ||
71 | static int | |
72 | tlc591xx_set_mode(struct regmap *regmap, u8 mode) | |
73 | { | |
74 | int err; | |
75 | u8 val; | |
76 | ||
77 | err = regmap_write(regmap, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE); | |
78 | if (err) | |
79 | return err; | |
80 | ||
81 | val = MODE2_OCH_STOP | mode; | |
82 | ||
83 | return regmap_write(regmap, TLC591XX_REG_MODE2, val); | |
84 | } | |
85 | ||
86 | static int | |
87 | tlc591xx_set_ledout(struct tlc591xx_priv *priv, struct tlc591xx_led *led, | |
88 | u8 val) | |
89 | { | |
90 | unsigned int i = (led->led_no % 4) * 2; | |
91 | unsigned int mask = LEDOUT_MASK << i; | |
92 | unsigned int addr = priv->reg_ledout_offset + (led->led_no >> 2); | |
93 | ||
94 | val = val << i; | |
95 | ||
96 | return regmap_update_bits(priv->regmap, addr, mask, val); | |
97 | } | |
98 | ||
99 | static int | |
100 | tlc591xx_set_pwm(struct tlc591xx_priv *priv, struct tlc591xx_led *led, | |
101 | u8 brightness) | |
102 | { | |
103 | u8 pwm = TLC591XX_REG_PWM(led->led_no); | |
104 | ||
105 | return regmap_write(priv->regmap, pwm, brightness); | |
106 | } | |
107 | ||
d890389f AL |
108 | static int |
109 | tlc591xx_brightness_set(struct led_classdev *led_cdev, | |
110 | enum led_brightness brightness) | |
e370d010 | 111 | { |
d890389f | 112 | struct tlc591xx_led *led = ldev_to_led(led_cdev); |
e370d010 | 113 | struct tlc591xx_priv *priv = led->priv; |
e370d010 AL |
114 | int err; |
115 | ||
a2cafdfd | 116 | switch ((int)brightness) { |
e370d010 AL |
117 | case 0: |
118 | err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF); | |
119 | break; | |
a2cafdfd | 120 | case TLC591XX_MAX_BRIGHTNESS: |
e370d010 AL |
121 | err = tlc591xx_set_ledout(priv, led, LEDOUT_ON); |
122 | break; | |
123 | default: | |
124 | err = tlc591xx_set_ledout(priv, led, LEDOUT_DIM); | |
125 | if (!err) | |
126 | err = tlc591xx_set_pwm(priv, led, brightness); | |
127 | } | |
128 | ||
d890389f | 129 | return err; |
e370d010 AL |
130 | } |
131 | ||
e370d010 AL |
132 | static const struct regmap_config tlc591xx_regmap = { |
133 | .reg_bits = 8, | |
134 | .val_bits = 8, | |
135 | .max_register = 0x1e, | |
136 | }; | |
137 | ||
138 | static const struct of_device_id of_tlc591xx_leds_match[] = { | |
139 | { .compatible = "ti,tlc59116", | |
140 | .data = &tlc59116 }, | |
141 | { .compatible = "ti,tlc59108", | |
142 | .data = &tlc59108 }, | |
143 | {}, | |
144 | }; | |
145 | MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match); | |
146 | ||
147 | static int | |
148 | tlc591xx_probe(struct i2c_client *client, | |
149 | const struct i2c_device_id *id) | |
150 | { | |
151 | struct device_node *np = client->dev.of_node, *child; | |
152 | struct device *dev = &client->dev; | |
153 | const struct of_device_id *match; | |
154 | const struct tlc591xx *tlc591xx; | |
155 | struct tlc591xx_priv *priv; | |
156 | int err, count, reg; | |
157 | ||
158 | match = of_match_device(of_tlc591xx_leds_match, dev); | |
159 | if (!match) | |
160 | return -ENODEV; | |
161 | ||
162 | tlc591xx = match->data; | |
163 | if (!np) | |
164 | return -ENODEV; | |
165 | ||
166 | count = of_get_child_count(np); | |
167 | if (!count || count > tlc591xx->max_leds) | |
168 | return -EINVAL; | |
169 | ||
e370d010 AL |
170 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
171 | if (!priv) | |
172 | return -ENOMEM; | |
173 | ||
174 | priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap); | |
175 | if (IS_ERR(priv->regmap)) { | |
176 | err = PTR_ERR(priv->regmap); | |
177 | dev_err(dev, "Failed to allocate register map: %d\n", err); | |
178 | return err; | |
179 | } | |
180 | priv->reg_ledout_offset = tlc591xx->reg_ledout_offset; | |
181 | ||
182 | i2c_set_clientdata(client, priv); | |
183 | ||
1ab4531a JJH |
184 | err = tlc591xx_set_mode(priv->regmap, MODE2_DIM); |
185 | if (err < 0) | |
186 | return err; | |
187 | ||
e370d010 | 188 | for_each_child_of_node(np, child) { |
1ab4531a | 189 | struct tlc591xx_led *led; |
5b4b723c JJH |
190 | struct led_init_data init_data = {}; |
191 | ||
192 | init_data.fwnode = of_fwnode_handle(child); | |
1ab4531a | 193 | |
e370d010 | 194 | err = of_property_read_u32(child, "reg", ®); |
c6872911 JL |
195 | if (err) { |
196 | of_node_put(child); | |
e370d010 | 197 | return err; |
c6872911 | 198 | } |
1055790b | 199 | if (reg < 0 || reg >= tlc591xx->max_leds || |
c6872911 JL |
200 | priv->leds[reg].active) { |
201 | of_node_put(child); | |
e370d010 | 202 | return -EINVAL; |
c6872911 | 203 | } |
1ab4531a JJH |
204 | led = &priv->leds[reg]; |
205 | ||
206 | led->active = true; | |
1ab4531a | 207 | led->ldev.default_trigger = |
e370d010 | 208 | of_get_property(child, "linux,default-trigger", NULL); |
e370d010 | 209 | |
1ab4531a JJH |
210 | led->priv = priv; |
211 | led->led_no = reg; | |
212 | led->ldev.brightness_set_blocking = tlc591xx_brightness_set; | |
a2cafdfd | 213 | led->ldev.max_brightness = TLC591XX_MAX_BRIGHTNESS; |
5b4b723c JJH |
214 | err = devm_led_classdev_register_ext(dev, &led->ldev, |
215 | &init_data); | |
1ab4531a | 216 | if (err < 0) { |
ba50e011 TV |
217 | if (err != -EPROBE_DEFER) |
218 | dev_err(dev, "couldn't register LED %s\n", | |
219 | led->ldev.name); | |
1ab4531a JJH |
220 | return err; |
221 | } | |
222 | } | |
e370d010 AL |
223 | return 0; |
224 | } | |
225 | ||
226 | static const struct i2c_device_id tlc591xx_id[] = { | |
227 | { "tlc59116" }, | |
228 | { "tlc59108" }, | |
229 | {}, | |
230 | }; | |
231 | MODULE_DEVICE_TABLE(i2c, tlc591xx_id); | |
232 | ||
233 | static struct i2c_driver tlc591xx_driver = { | |
234 | .driver = { | |
235 | .name = "tlc591xx", | |
236 | .of_match_table = of_match_ptr(of_tlc591xx_leds_match), | |
237 | }, | |
238 | .probe = tlc591xx_probe, | |
e370d010 AL |
239 | .id_table = tlc591xx_id, |
240 | }; | |
241 | ||
242 | module_i2c_driver(tlc591xx_driver); | |
243 | ||
244 | MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); | |
245 | MODULE_LICENSE("GPL"); | |
246 | MODULE_DESCRIPTION("TLC591XX LED driver"); |