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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2014 Belkin Inc.
4 * Copyright 2015 Andrew Lunn <andrew@lunn.ch>
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/regmap.h>
12#include <linux/slab.h>
13
14#define TLC591XX_MAX_LEDS 16
15#define TLC591XX_MAX_BRIGHTNESS 256
16
17#define TLC591XX_REG_MODE1 0x00
18#define MODE1_RESPON_ADDR_MASK 0xF0
19#define MODE1_NORMAL_MODE (0 << 4)
20#define MODE1_SPEED_MODE (1 << 4)
21
22#define TLC591XX_REG_MODE2 0x01
23#define MODE2_DIM (0 << 5)
24#define MODE2_BLINK (1 << 5)
25#define MODE2_OCH_STOP (0 << 3)
26#define MODE2_OCH_ACK (1 << 3)
27
28#define TLC591XX_REG_PWM(x) (0x02 + (x))
29
30#define TLC591XX_REG_GRPPWM 0x12
31#define TLC591XX_REG_GRPFREQ 0x13
32
33/* LED Driver Output State, determine the source that drives LED outputs */
34#define LEDOUT_OFF 0x0 /* Output LOW */
35#define LEDOUT_ON 0x1 /* Output HI-Z */
36#define LEDOUT_DIM 0x2 /* Dimming */
37#define LEDOUT_BLINK 0x3 /* Blinking */
38#define LEDOUT_MASK 0x3
39
40#define ldev_to_led(c) container_of(c, struct tlc591xx_led, ldev)
41
42struct tlc591xx_led {
43 bool active;
44 unsigned int led_no;
45 struct led_classdev ldev;
46 struct tlc591xx_priv *priv;
47};
48
49struct tlc591xx_priv {
50 struct tlc591xx_led leds[TLC591XX_MAX_LEDS];
51 struct regmap *regmap;
52 unsigned int reg_ledout_offset;
53};
54
55struct tlc591xx {
56 unsigned int max_leds;
57 unsigned int reg_ledout_offset;
58};
59
60static const struct tlc591xx tlc59116 = {
61 .max_leds = 16,
62 .reg_ledout_offset = 0x14,
63};
64
65static const struct tlc591xx tlc59108 = {
66 .max_leds = 8,
67 .reg_ledout_offset = 0x0c,
68};
69
70static int
71tlc591xx_set_mode(struct regmap *regmap, u8 mode)
72{
73 int err;
74 u8 val;
75
76 err = regmap_write(regmap, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE);
77 if (err)
78 return err;
79
80 val = MODE2_OCH_STOP | mode;
81
82 return regmap_write(regmap, TLC591XX_REG_MODE2, val);
83}
84
85static int
86tlc591xx_set_ledout(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
87 u8 val)
88{
89 unsigned int i = (led->led_no % 4) * 2;
90 unsigned int mask = LEDOUT_MASK << i;
91 unsigned int addr = priv->reg_ledout_offset + (led->led_no >> 2);
92
93 val = val << i;
94
95 return regmap_update_bits(priv->regmap, addr, mask, val);
96}
97
98static int
99tlc591xx_set_pwm(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
100 u8 brightness)
101{
102 u8 pwm = TLC591XX_REG_PWM(led->led_no);
103
104 return regmap_write(priv->regmap, pwm, brightness);
105}
106
107static int
108tlc591xx_brightness_set(struct led_classdev *led_cdev,
109 enum led_brightness brightness)
110{
111 struct tlc591xx_led *led = ldev_to_led(led_cdev);
112 struct tlc591xx_priv *priv = led->priv;
113 int err;
114
115 switch ((int)brightness) {
116 case 0:
117 err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF);
118 break;
119 case TLC591XX_MAX_BRIGHTNESS:
120 err = tlc591xx_set_ledout(priv, led, LEDOUT_ON);
121 break;
122 default:
123 err = tlc591xx_set_ledout(priv, led, LEDOUT_DIM);
124 if (!err)
125 err = tlc591xx_set_pwm(priv, led, brightness);
126 }
127
128 return err;
129}
130
131static const struct regmap_config tlc591xx_regmap = {
132 .reg_bits = 8,
133 .val_bits = 8,
134 .max_register = 0x1e,
135};
136
137static const struct of_device_id of_tlc591xx_leds_match[] __maybe_unused = {
138 { .compatible = "ti,tlc59116",
139 .data = &tlc59116 },
140 { .compatible = "ti,tlc59108",
141 .data = &tlc59108 },
142 {},
143};
144MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match);
145
146static int
147tlc591xx_probe(struct i2c_client *client)
148{
149 struct device_node *np;
150 struct device *dev = &client->dev;
151 const struct tlc591xx *tlc591xx;
152 struct tlc591xx_priv *priv;
153 int err, count, reg;
154
155 np = dev_of_node(dev);
156 if (!np)
157 return -ENODEV;
158
159 tlc591xx = device_get_match_data(dev);
160 if (!tlc591xx)
161 return -ENODEV;
162
163 count = of_get_available_child_count(np);
164 if (!count || count > tlc591xx->max_leds)
165 return -EINVAL;
166
167 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
168 if (!priv)
169 return -ENOMEM;
170
171 priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap);
172 if (IS_ERR(priv->regmap)) {
173 err = PTR_ERR(priv->regmap);
174 dev_err(dev, "Failed to allocate register map: %d\n", err);
175 return err;
176 }
177 priv->reg_ledout_offset = tlc591xx->reg_ledout_offset;
178
179 i2c_set_clientdata(client, priv);
180
181 err = tlc591xx_set_mode(priv->regmap, MODE2_DIM);
182 if (err < 0)
183 return err;
184
185 for_each_available_child_of_node_scoped(np, child) {
186 struct tlc591xx_led *led;
187 struct led_init_data init_data = {};
188
189 init_data.fwnode = of_fwnode_handle(child);
190
191 err = of_property_read_u32(child, "reg", ®);
192 if (err)
193 return err;
194
195 if (reg < 0 || reg >= tlc591xx->max_leds ||
196 priv->leds[reg].active)
197 return -EINVAL;
198
199 led = &priv->leds[reg];
200
201 led->active = true;
202 led->priv = priv;
203 led->led_no = reg;
204 led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
205 led->ldev.max_brightness = TLC591XX_MAX_BRIGHTNESS;
206 err = devm_led_classdev_register_ext(dev, &led->ldev,
207 &init_data);
208 if (err < 0)
209 return dev_err_probe(dev, err,
210 "couldn't register LED %s\n",
211 led->ldev.name);
212 }
213 return 0;
214}
215
216static const struct i2c_device_id tlc591xx_id[] = {
217 { "tlc59116" },
218 { "tlc59108" },
219 {},
220};
221MODULE_DEVICE_TABLE(i2c, tlc591xx_id);
222
223static struct i2c_driver tlc591xx_driver = {
224 .driver = {
225 .name = "tlc591xx",
226 .of_match_table = of_match_ptr(of_tlc591xx_leds_match),
227 },
228 .probe = tlc591xx_probe,
229 .id_table = tlc591xx_id,
230};
231
232module_i2c_driver(tlc591xx_driver);
233
234MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
235MODULE_LICENSE("GPL");
236MODULE_DESCRIPTION("TLC591XX LED driver");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2014 Belkin Inc.
4 * Copyright 2015 Andrew Lunn <andrew@lunn.ch>
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>
14
15#define TLC591XX_MAX_LEDS 16
16#define TLC591XX_MAX_BRIGHTNESS 256
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)
42
43struct tlc591xx_led {
44 bool active;
45 unsigned int led_no;
46 struct led_classdev ldev;
47 struct tlc591xx_priv *priv;
48};
49
50struct tlc591xx_priv {
51 struct tlc591xx_led leds[TLC591XX_MAX_LEDS];
52 struct regmap *regmap;
53 unsigned int reg_ledout_offset;
54};
55
56struct tlc591xx {
57 unsigned int max_leds;
58 unsigned int reg_ledout_offset;
59};
60
61static const struct tlc591xx tlc59116 = {
62 .max_leds = 16,
63 .reg_ledout_offset = 0x14,
64};
65
66static const struct tlc591xx tlc59108 = {
67 .max_leds = 8,
68 .reg_ledout_offset = 0x0c,
69};
70
71static int
72tlc591xx_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
86static int
87tlc591xx_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
99static int
100tlc591xx_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
108static int
109tlc591xx_brightness_set(struct led_classdev *led_cdev,
110 enum led_brightness brightness)
111{
112 struct tlc591xx_led *led = ldev_to_led(led_cdev);
113 struct tlc591xx_priv *priv = led->priv;
114 int err;
115
116 switch ((int)brightness) {
117 case 0:
118 err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF);
119 break;
120 case TLC591XX_MAX_BRIGHTNESS:
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
129 return err;
130}
131
132static const struct regmap_config tlc591xx_regmap = {
133 .reg_bits = 8,
134 .val_bits = 8,
135 .max_register = 0x1e,
136};
137
138static 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};
145MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match);
146
147static int
148tlc591xx_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
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
184 err = tlc591xx_set_mode(priv->regmap, MODE2_DIM);
185 if (err < 0)
186 return err;
187
188 for_each_child_of_node(np, child) {
189 struct tlc591xx_led *led;
190 struct led_init_data init_data = {};
191
192 init_data.fwnode = of_fwnode_handle(child);
193
194 err = of_property_read_u32(child, "reg", ®);
195 if (err) {
196 of_node_put(child);
197 return err;
198 }
199 if (reg < 0 || reg >= tlc591xx->max_leds ||
200 priv->leds[reg].active) {
201 of_node_put(child);
202 return -EINVAL;
203 }
204 led = &priv->leds[reg];
205
206 led->active = true;
207 led->ldev.default_trigger =
208 of_get_property(child, "linux,default-trigger", NULL);
209
210 led->priv = priv;
211 led->led_no = reg;
212 led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
213 led->ldev.max_brightness = TLC591XX_MAX_BRIGHTNESS;
214 err = devm_led_classdev_register_ext(dev, &led->ldev,
215 &init_data);
216 if (err < 0) {
217 if (err != -EPROBE_DEFER)
218 dev_err(dev, "couldn't register LED %s\n",
219 led->ldev.name);
220 return err;
221 }
222 }
223 return 0;
224}
225
226static const struct i2c_device_id tlc591xx_id[] = {
227 { "tlc59116" },
228 { "tlc59108" },
229 {},
230};
231MODULE_DEVICE_TABLE(i2c, tlc591xx_id);
232
233static 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,
239 .id_table = tlc591xx_id,
240};
241
242module_i2c_driver(tlc591xx_driver);
243
244MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
245MODULE_LICENSE("GPL");
246MODULE_DESCRIPTION("TLC591XX LED driver");