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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
35#define LEDOUT_OFF 0x0
36#define LEDOUT_ON 0x1
37#define LEDOUT_DIM 0x2
38#define LEDOUT_BLINK 0x3
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 = dev_of_node(&client->dev), *child;
152 struct device *dev = &client->dev;
153 const struct tlc591xx *tlc591xx;
154 struct tlc591xx_priv *priv;
155 int err, count, reg;
156
157 tlc591xx = device_get_match_data(dev);
158 if (!np)
159 return -ENODEV;
160
161 count = of_get_available_child_count(np);
162 if (!count || count > tlc591xx->max_leds)
163 return -EINVAL;
164
165 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
166 if (!priv)
167 return -ENOMEM;
168
169 priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap);
170 if (IS_ERR(priv->regmap)) {
171 err = PTR_ERR(priv->regmap);
172 dev_err(dev, "Failed to allocate register map: %d\n", err);
173 return err;
174 }
175 priv->reg_ledout_offset = tlc591xx->reg_ledout_offset;
176
177 i2c_set_clientdata(client, priv);
178
179 err = tlc591xx_set_mode(priv->regmap, MODE2_DIM);
180 if (err < 0)
181 return err;
182
183 for_each_available_child_of_node(np, child) {
184 struct tlc591xx_led *led;
185 struct led_init_data init_data = {};
186
187 init_data.fwnode = of_fwnode_handle(child);
188
189 err = of_property_read_u32(child, "reg", ®);
190 if (err) {
191 of_node_put(child);
192 return err;
193 }
194 if (reg < 0 || reg >= tlc591xx->max_leds ||
195 priv->leds[reg].active) {
196 of_node_put(child);
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 of_node_put(child);
210 return dev_err_probe(dev, err,
211 "couldn't register LED %s\n",
212 led->ldev.name);
213 }
214 }
215 return 0;
216}
217
218static const struct i2c_device_id tlc591xx_id[] = {
219 { "tlc59116" },
220 { "tlc59108" },
221 {},
222};
223MODULE_DEVICE_TABLE(i2c, tlc591xx_id);
224
225static struct i2c_driver tlc591xx_driver = {
226 .driver = {
227 .name = "tlc591xx",
228 .of_match_table = of_match_ptr(of_tlc591xx_leds_match),
229 },
230 .probe = tlc591xx_probe,
231 .id_table = tlc591xx_id,
232};
233
234module_i2c_driver(tlc591xx_driver);
235
236MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
237MODULE_LICENSE("GPL");
238MODULE_DESCRIPTION("TLC591XX LED driver");
239
