aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/leds/leds-lp3952.c
blob: 847f7f282126eeef4608ba5eb87620fe084051de (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
/*
 *	LED driver for TI lp3952 controller
 *
 *	Copyright (C) 2016, DAQRI, LLC.
 *	Author: Tony Makkiel <tony.makkiel@daqri.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/leds-lp3952.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/reboot.h>
#include <linux/regmap.h>

static int lp3952_register_write(struct i2c_client *client, u8 reg, u8 val)
{
	int ret;
	struct lp3952_led_array *priv = i2c_get_clientdata(client);

	ret = regmap_write(priv->regmap, reg, val);

	if (ret)
		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
			__func__, reg, val, ret);
	return ret;
}

static void lp3952_on_off(struct lp3952_led_array *priv,
			  enum lp3952_leds led_id, bool on)
{
	int ret, val;

	dev_dbg(&priv->client->dev, "%s LED %d to %d\n", __func__, led_id, on);

	val = 1 << led_id;
	if (led_id == LP3952_LED_ALL)
		val = LP3952_LED_MASK_ALL;

	ret = regmap_update_bits(priv->regmap, LP3952_REG_LED_CTRL, val,
				 on ? val : 0);
	if (ret)
		dev_err(&priv->client->dev, "%s, Error %d\n", __func__, ret);
}

/*
 * Using Imax to control brightness. There are 4 possible
 * setting 25, 50, 75 and 100 % of Imax. Possible values are
 * values 0-4. 0 meaning turn off.
 */
static int lp3952_set_brightness(struct led_classdev *cdev,
				 enum led_brightness value)
{
	unsigned int reg, shift_val;
	struct lp3952_ctrl_hdl *led = container_of(cdev,
						   struct lp3952_ctrl_hdl,
						   cdev);
	struct lp3952_led_array *priv = (struct lp3952_led_array *)led->priv;

	dev_dbg(cdev->dev, "Brightness request: %d on %d\n", value,
		led->channel);

	if (value == LED_OFF) {
		lp3952_on_off(priv, led->channel, false);
		return 0;
	}

	if (led->channel > LP3952_RED_1) {
		dev_err(cdev->dev, " %s Invalid LED requested", __func__);
		return -EINVAL;
	}

	if (led->channel >= LP3952_BLUE_1) {
		reg = LP3952_REG_RGB1_MAX_I_CTRL;
		shift_val = (led->channel - LP3952_BLUE_1) * 2;
	} else {
		reg = LP3952_REG_RGB2_MAX_I_CTRL;
		shift_val = led->channel * 2;
	}

	/* Enable the LED in case it is not enabled already */
	lp3952_on_off(priv, led->channel, true);

	return regmap_update_bits(priv->regmap, reg, 3 << shift_val,
				  --value << shift_val);
}

static int lp3952_get_label(struct device *dev, const char *label, char *dest)
{
	int ret;
	const char *str;

	ret = device_property_read_string(dev, label, &str);
	if (ret)
		return ret;

	strncpy(dest, str, LP3952_LABEL_MAX_LEN);
	return 0;
}

static int lp3952_register_led_classdev(struct lp3952_led_array *priv)
{
	int i, acpi_ret, ret = -ENODEV;
	static const char *led_name_hdl[LP3952_LED_ALL] = {
		"blue2",
		"green2",
		"red2",
		"blue1",
		"green1",
		"red1"
	};

	for (i = 0; i < LP3952_LED_ALL; i++) {
		acpi_ret = lp3952_get_label(&priv->client->dev, led_name_hdl[i],
					    priv->leds[i].name);
		if (acpi_ret)
			continue;

		priv->leds[i].cdev.name = priv->leds[i].name;
		priv->leds[i].cdev.brightness = LED_OFF;
		priv->leds[i].cdev.max_brightness = LP3952_BRIGHT_MAX;
		priv->leds[i].cdev.brightness_set_blocking =
				lp3952_set_brightness;
		priv->leds[i].channel = i;
		priv->leds[i].priv = priv;

		ret = devm_led_classdev_register(&priv->client->dev,
						 &priv->leds[i].cdev);
		if (ret < 0) {
			dev_err(&priv->client->dev,
				"couldn't register LED %s\n",
				priv->leds[i].cdev.name);
			break;
		}
	}
	return ret;
}

static int lp3952_set_pattern_gen_cmd(struct lp3952_led_array *priv,
				      u8 cmd_index, u8 r, u8 g, u8 b,
				      enum lp3952_tt tt, enum lp3952_cet cet)
{
	int ret;
	struct ptrn_gen_cmd line = {
		{
			{
				.r = r,
				.g = g,
				.b = b,
				.cet = cet,
				.tt = tt
			}
		}
	};

	if (cmd_index >= LP3952_CMD_REG_COUNT)
		return -EINVAL;

	ret = lp3952_register_write(priv->client,
				    LP3952_REG_CMD_0 + cmd_index * 2,
				    line.bytes.msb);
	if (ret)
		return ret;

	return lp3952_register_write(priv->client,
				      LP3952_REG_CMD_0 + cmd_index * 2 + 1,
				      line.bytes.lsb);
}

static int lp3952_configure(struct lp3952_led_array *priv)
{
	int ret;

	/* Disable any LEDs on from any previous conf. */
	ret = lp3952_register_write(priv->client, LP3952_REG_LED_CTRL, 0);
	if (ret)
		return ret;

	/* enable rgb patter, loop */
	ret = lp3952_register_write(priv->client, LP3952_REG_PAT_GEN_CTRL,
				    LP3952_PATRN_LOOP | LP3952_PATRN_GEN_EN);
	if (ret)
		return ret;

	/* Update Bit 6 (Active mode), Select both Led sets, Bit [1:0] */
	ret = lp3952_register_write(priv->client, LP3952_REG_ENABLES,
				    LP3952_ACTIVE_MODE | LP3952_INT_B00ST_LDR);
	if (ret)
		return ret;

	/* Set Cmd1 for RGB intensity,cmd and transition time */
	return lp3952_set_pattern_gen_cmd(priv, 0, I46, I71, I100, TT0,
					   CET197);
}

static const struct regmap_config lp3952_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = REG_MAX,
	.cache_type = REGCACHE_RBTREE,
};

static int lp3952_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int status;
	struct lp3952_led_array *priv;

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

	priv->client = client;

	priv->enable_gpio = devm_gpiod_get(&client->dev, "nrst",
					   GPIOD_OUT_HIGH);
	if (IS_ERR(priv->enable_gpio)) {
		status = PTR_ERR(priv->enable_gpio);
		dev_err(&client->dev, "Failed to enable gpio: %d\n", status);
		return status;
	}

	priv->regmap = devm_regmap_init_i2c(client, &lp3952_regmap);
	if (IS_ERR(priv->regmap)) {
		int err = PTR_ERR(priv->regmap);

		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			err);
		return err;
	}

	i2c_set_clientdata(client, priv);

	status = lp3952_configure(priv);
	if (status) {
		dev_err(&client->dev, "Probe failed. Device not found (%d)\n",
			status);
		return status;
	}

	status = lp3952_register_led_classdev(priv);
	if (status) {
		dev_err(&client->dev, "Unable to register led_classdev: %d\n",
			status);
		return status;
	}

	return 0;
}

static int lp3952_remove(struct i2c_client *client)
{
	struct lp3952_led_array *priv;

	priv = i2c_get_clientdata(client);
	lp3952_on_off(priv, LP3952_LED_ALL, false);
	gpiod_set_value(priv->enable_gpio, 0);

	return 0;
}

static const struct i2c_device_id lp3952_id[] = {
	{LP3952_NAME, 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, lp3952_id);

static struct i2c_driver lp3952_i2c_driver = {
	.driver = {
			.name = LP3952_NAME,
	},
	.probe = lp3952_probe,
	.remove = lp3952_remove,
	.id_table = lp3952_id,
};

module_i2c_driver(lp3952_i2c_driver);

MODULE_AUTHOR("Tony Makkiel <tony.makkiel@daqri.com>");
MODULE_DESCRIPTION("lp3952 I2C LED controller driver");
MODULE_LICENSE("GPL v2");

Privacy Policy