summaryrefslogtreecommitdiffstats
path: root/drivers/leds/leds-tlc591xx.c
blob: de16c29d7895412ce48368b4b01a011b0449e587 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/*
 * Copyright 2014 Belkin Inc.
 * Copyright 2015 Andrew Lunn <andrew@lunn.ch>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 */

#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#define TLC591XX_MAX_LEDS	16

#define TLC591XX_REG_MODE1	0x00
#define MODE1_RESPON_ADDR_MASK	0xF0
#define MODE1_NORMAL_MODE	(0 << 4)
#define MODE1_SPEED_MODE	(1 << 4)

#define TLC591XX_REG_MODE2	0x01
#define MODE2_DIM		(0 << 5)
#define MODE2_BLINK		(1 << 5)
#define MODE2_OCH_STOP		(0 << 3)
#define MODE2_OCH_ACK		(1 << 3)

#define TLC591XX_REG_PWM(x)	(0x02 + (x))

#define TLC591XX_REG_GRPPWM	0x12
#define TLC591XX_REG_GRPFREQ	0x13

/* LED Driver Output State, determine the source that drives LED outputs */
#define LEDOUT_OFF		0x0	/* Output LOW */
#define LEDOUT_ON		0x1	/* Output HI-Z */
#define LEDOUT_DIM		0x2	/* Dimming */
#define LEDOUT_BLINK		0x3	/* Blinking */
#define LEDOUT_MASK		0x3

#define ldev_to_led(c)		container_of(c, struct tlc591xx_led, ldev)
#define work_to_led(work)	container_of(work, struct tlc591xx_led, work)

struct tlc591xx_led {
	bool active;
	unsigned int led_no;
	struct led_classdev ldev;
	struct work_struct work;
	struct tlc591xx_priv *priv;
};

struct tlc591xx_priv {
	struct tlc591xx_led leds[TLC591XX_MAX_LEDS];
	struct regmap *regmap;
	unsigned int reg_ledout_offset;
};

struct tlc591xx {
	unsigned int max_leds;
	unsigned int reg_ledout_offset;
};

static const struct tlc591xx tlc59116 = {
	.max_leds = 16,
	.reg_ledout_offset = 0x14,
};

static const struct tlc591xx tlc59108 = {
	.max_leds = 8,
	.reg_ledout_offset = 0x0c,
};

static int
tlc591xx_set_mode(struct regmap *regmap, u8 mode)
{
	int err;
	u8 val;

	err = regmap_write(regmap, TLC591XX_REG_MODE1, MODE1_NORMAL_MODE);
	if (err)
		return err;

	val = MODE2_OCH_STOP | mode;

	return regmap_write(regmap, TLC591XX_REG_MODE2, val);
}

static int
tlc591xx_set_ledout(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
		    u8 val)
{
	unsigned int i = (led->led_no % 4) * 2;
	unsigned int mask = LEDOUT_MASK << i;
	unsigned int addr = priv->reg_ledout_offset + (led->led_no >> 2);

	val = val << i;

	return regmap_update_bits(priv->regmap, addr, mask, val);
}

static int
tlc591xx_set_pwm(struct tlc591xx_priv *priv, struct tlc591xx_led *led,
		 u8 brightness)
{
	u8 pwm = TLC591XX_REG_PWM(led->led_no);

	return regmap_write(priv->regmap, pwm, brightness);
}

static void
tlc591xx_led_work(struct work_struct *work)
{
	struct tlc591xx_led *led = work_to_led(work);
	struct tlc591xx_priv *priv = led->priv;
	enum led_brightness brightness = led->ldev.brightness;
	int err;

	switch (brightness) {
	case 0:
		err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF);
		break;
	case LED_FULL:
		err = tlc591xx_set_ledout(priv, led, LEDOUT_ON);
		break;
	default:
		err = tlc591xx_set_ledout(priv, led, LEDOUT_DIM);
		if (!err)
			err = tlc591xx_set_pwm(priv, led, brightness);
	}

	if (err)
		dev_err(led->ldev.dev, "Failed setting brightness\n");
}

static void
tlc591xx_brightness_set(struct led_classdev *led_cdev,
			enum led_brightness brightness)
{
	struct tlc591xx_led *led = ldev_to_led(led_cdev);

	led->ldev.brightness = brightness;
	schedule_work(&led->work);
}

static void
tlc591xx_destroy_devices(struct tlc591xx_priv *priv, unsigned int j)
{
	int i = j;

	while (--i >= 0) {
		if (priv->leds[i].active) {
			led_classdev_unregister(&priv->leds[i].ldev);
			cancel_work_sync(&priv->leds[i].work);
		}
	}
}

static int
tlc591xx_configure(struct device *dev,
		   struct tlc591xx_priv *priv,
		   const struct tlc591xx *tlc591xx)
{
	unsigned int i;
	int err = 0;

	tlc591xx_set_mode(priv->regmap, MODE2_DIM);
	for (i = 0; i < TLC591XX_MAX_LEDS; i++) {
		struct tlc591xx_led *led = &priv->leds[i];

		if (!led->active)
			continue;

		led->priv = priv;
		led->led_no = i;
		led->ldev.brightness_set = tlc591xx_brightness_set;
		led->ldev.max_brightness = LED_FULL;
		INIT_WORK(&led->work, tlc591xx_led_work);
		err = led_classdev_register(dev, &led->ldev);
		if (err < 0) {
			dev_err(dev, "couldn't register LED %s\n",
				led->ldev.name);
			goto exit;
		}
	}

	return 0;

exit:
	tlc591xx_destroy_devices(priv, i);
	return err;
}

static const struct regmap_config tlc591xx_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0x1e,
};

static const struct of_device_id of_tlc591xx_leds_match[] = {
	{ .compatible = "ti,tlc59116",
	  .data = &tlc59116 },
	{ .compatible = "ti,tlc59108",
	  .data = &tlc59108 },
	{},
};
MODULE_DEVICE_TABLE(of, of_tlc591xx_leds_match);

static int
tlc591xx_probe(struct i2c_client *client,
	       const struct i2c_device_id *id)
{
	struct device_node *np = client->dev.of_node, *child;
	struct device *dev = &client->dev;
	const struct of_device_id *match;
	const struct tlc591xx *tlc591xx;
	struct tlc591xx_priv *priv;
	int err, count, reg;

	match = of_match_device(of_tlc591xx_leds_match, dev);
	if (!match)
		return -ENODEV;

	tlc591xx = match->data;
	if (!np)
		return -ENODEV;

	count = of_get_child_count(np);
	if (!count || count > tlc591xx->max_leds)
		return -EINVAL;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA))
		return -EIO;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->regmap = devm_regmap_init_i2c(client, &tlc591xx_regmap);
	if (IS_ERR(priv->regmap)) {
		err = PTR_ERR(priv->regmap);
		dev_err(dev, "Failed to allocate register map: %d\n", err);
		return err;
	}
	priv->reg_ledout_offset = tlc591xx->reg_ledout_offset;

	i2c_set_clientdata(client, priv);

	for_each_child_of_node(np, child) {
		err = of_property_read_u32(child, "reg", &reg);
		if (err)
			return err;
		if (reg < 0 || reg >= tlc591xx->max_leds)
			return -EINVAL;
		if (priv->leds[reg].active)
			return -EINVAL;
		priv->leds[reg].active = true;
		priv->leds[reg].ldev.name =
			of_get_property(child, "label", NULL) ? : child->name;
		priv->leds[reg].ldev.default_trigger =
			of_get_property(child, "linux,default-trigger", NULL);
	}
	return tlc591xx_configure(dev, priv, tlc591xx);
}

static int
tlc591xx_remove(struct i2c_client *client)
{
	struct tlc591xx_priv *priv = i2c_get_clientdata(client);

	tlc591xx_destroy_devices(priv, TLC591XX_MAX_LEDS);

	return 0;
}

static const struct i2c_device_id tlc591xx_id[] = {
	{ "tlc59116" },
	{ "tlc59108" },
	{},
};
MODULE_DEVICE_TABLE(i2c, tlc591xx_id);

static struct i2c_driver tlc591xx_driver = {
	.driver = {
		.name = "tlc591xx",
		.of_match_table = of_match_ptr(of_tlc591xx_leds_match),
	},
	.probe = tlc591xx_probe,
	.remove = tlc591xx_remove,
	.id_table = tlc591xx_id,
};

module_i2c_driver(tlc591xx_driver);

MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("TLC591XX LED driver");