[linux-2.6-block.git] / drivers / leds / leds-lp3952.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *	LED driver for TI lp3952 controller
 *
 *	Copyright (C) 2016, DAQRI, LLC.
 *	Author: Tony Makkiel <tony.makkiel@daqri.com>
 */

#include <linux/delay.h>
#include <linux/gpio/consumer.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;

	strscpy(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_MAPLE,
};

static void gpio_set_low_action(void *data)
{
	struct lp3952_led_array *priv = data;

	gpiod_set_value(priv->enable_gpio, 0);
}

static int lp3952_probe(struct i2c_client *client)
{
	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;
	}

	status = devm_add_action(&client->dev, gpio_set_low_action, priv);
	if (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 const struct i2c_device_id lp3952_id[] = {
	{ LP3952_NAME },
	{}
};
MODULE_DEVICE_TABLE(i2c, lp3952_id);

static struct i2c_driver lp3952_i2c_driver = {
	.driver = {
			.name = LP3952_NAME,
	},
	.probe = lp3952_probe,
	.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");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
d966c943 TM	2	/*
	3	* LED driver for TI lp3952 controller
	4	*
	5	* Copyright (C) 2016, DAQRI, LLC.
	6	* Author: Tony Makkiel <tony.makkiel@daqri.com>
d966c943 TM	7	*/
d966c943 TM	8
d966c943	9	#include <linux/delay.h>
da542caf	10	#include <linux/gpio/consumer.h>
d966c943 TM	11	#include <linux/i2c.h>
	12	#include <linux/io.h>
	13	#include <linux/kernel.h>
	14	#include <linux/leds.h>
	15	#include <linux/leds-lp3952.h>
	16	#include <linux/module.h>
	17	#include <linux/notifier.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/pm.h>
	20	#include <linux/reboot.h>
	21	#include <linux/regmap.h>
	22
	23	static int lp3952_register_write(struct i2c_client *client, u8 reg, u8 val)
	24	{
	25	int ret;
	26	struct lp3952_led_array *priv = i2c_get_clientdata(client);
	27
	28	ret = regmap_write(priv->regmap, reg, val);
	29
	30	if (ret)
	31	dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
	32	__func__, reg, val, ret);
	33	return ret;
	34	}
	35
	36	static void lp3952_on_off(struct lp3952_led_array *priv,
	37	enum lp3952_leds led_id, bool on)
	38	{
	39	int ret, val;
	40
	41	dev_dbg(&priv->client->dev, "%s LED %d to %d\n", __func__, led_id, on);
	42
	43	val = 1 << led_id;
	44	if (led_id == LP3952_LED_ALL)
	45	val = LP3952_LED_MASK_ALL;
	46
	47	ret = regmap_update_bits(priv->regmap, LP3952_REG_LED_CTRL, val,
	48	on ? val : 0);
	49	if (ret)
	50	dev_err(&priv->client->dev, "%s, Error %d\n", __func__, ret);
	51	}
	52
	53	/*
	54	* Using Imax to control brightness. There are 4 possible
	55	* setting 25, 50, 75 and 100 % of Imax. Possible values are
	56	* values 0-4. 0 meaning turn off.
	57	*/
	58	static int lp3952_set_brightness(struct led_classdev *cdev,
	59	enum led_brightness value)
	60	{
	61	unsigned int reg, shift_val;
	62	struct lp3952_ctrl_hdl *led = container_of(cdev,
	63	struct lp3952_ctrl_hdl,
	64	cdev);
	65	struct lp3952_led_array priv = (struct lp3952_led_array )led->priv;
	66
	67	dev_dbg(cdev->dev, "Brightness request: %d on %d\n", value,
	68	led->channel);
	69
	70	if (value == LED_OFF) {
	71	lp3952_on_off(priv, led->channel, false);
	72	return 0;
	73	}
	74
75	if (led->channel > LP3952_RED_1) {
76	dev_err(cdev->dev, " %s Invalid LED requested", __func__);
77	return -EINVAL;
78	}
79
80	if (led->channel >= LP3952_BLUE_1) {
81	reg = LP3952_REG_RGB1_MAX_I_CTRL;
82	shift_val = (led->channel - LP3952_BLUE_1) * 2;
83	} else {
84	reg = LP3952_REG_RGB2_MAX_I_CTRL;
85	shift_val = led->channel * 2;
86	}
87
88	/* Enable the LED in case it is not enabled already */
89	lp3952_on_off(priv, led->channel, true);
90
91	return regmap_update_bits(priv->regmap, reg, 3 << shift_val,
92	--value << shift_val);
93	}
94
95	static int lp3952_get_label(struct device dev, const char label, char *dest)
96	{
97	int ret;
98	const char *str;
99
100	ret = device_property_read_string(dev, label, &str);
f4363d81 AS	101	if (ret)
f4363d81 AS	102	return ret;
d966c943	103
a337ee0d	104	strscpy(dest, str, LP3952_LABEL_MAX_LEN);
f4363d81	105	return 0;
d966c943 TM	106	}
	107
	108	static int lp3952_register_led_classdev(struct lp3952_led_array *priv)
	109	{
	110	int i, acpi_ret, ret = -ENODEV;
	111	static const char *led_name_hdl[LP3952_LED_ALL] = {
	112	"blue2",
	113	"green2",
	114	"red2",
	115	"blue1",
	116	"green1",
	117	"red1"
	118	};
	119
	120	for (i = 0; i < LP3952_LED_ALL; i++) {
	121	acpi_ret = lp3952_get_label(&priv->client->dev, led_name_hdl[i],
	122	priv->leds[i].name);
	123	if (acpi_ret)
	124	continue;
	125
	126	priv->leds[i].cdev.name = priv->leds[i].name;
	127	priv->leds[i].cdev.brightness = LED_OFF;
	128	priv->leds[i].cdev.max_brightness = LP3952_BRIGHT_MAX;
	129	priv->leds[i].cdev.brightness_set_blocking =
	130	lp3952_set_brightness;
	131	priv->leds[i].channel = i;
	132	priv->leds[i].priv = priv;
	133
	134	ret = devm_led_classdev_register(&priv->client->dev,
	135	&priv->leds[i].cdev);
	136	if (ret < 0) {
	137	dev_err(&priv->client->dev,
	138	"couldn't register LED %s\n",
	139	priv->leds[i].cdev.name);
	140	break;
	141	}
	142	}
	143	return ret;
	144	}
	145
	146	static int lp3952_set_pattern_gen_cmd(struct lp3952_led_array *priv,
	147	u8 cmd_index, u8 r, u8 g, u8 b,
	148	enum lp3952_tt tt, enum lp3952_cet cet)
	149	{
	150	int ret;
	151	struct ptrn_gen_cmd line = {
	152	{
	153	{
	154	.r = r,
	155	.g = g,
	156	.b = b,
	157	.cet = cet,
	158	.tt = tt
	159	}
	160	}
	161	};
	162
	163	if (cmd_index >= LP3952_CMD_REG_COUNT)
	164	return -EINVAL;
	165
	166	ret = lp3952_register_write(priv->client,
	167	LP3952_REG_CMD_0 + cmd_index * 2,
	168	line.bytes.msb);
	169	if (ret)
170	return ret;
171
172	return lp3952_register_write(priv->client,
173	LP3952_REG_CMD_0 + cmd_index * 2 + 1,
174	line.bytes.lsb);
175	}
176
177	static int lp3952_configure(struct lp3952_led_array *priv)
178	{
179	int ret;
180
181	/* Disable any LEDs on from any previous conf. */
182	ret = lp3952_register_write(priv->client, LP3952_REG_LED_CTRL, 0);
183	if (ret)
184	return ret;
185
186	/* enable rgb patter, loop */
187	ret = lp3952_register_write(priv->client, LP3952_REG_PAT_GEN_CTRL,
188	LP3952_PATRN_LOOP \| LP3952_PATRN_GEN_EN);
189	if (ret)
190	return ret;
191
192	/* Update Bit 6 (Active mode), Select both Led sets, Bit [1:0] */
193	ret = lp3952_register_write(priv->client, LP3952_REG_ENABLES,
194	LP3952_ACTIVE_MODE \| LP3952_INT_B00ST_LDR);
195	if (ret)
196	return ret;
197
198	/* Set Cmd1 for RGB intensity,cmd and transition time */
199	return lp3952_set_pattern_gen_cmd(priv, 0, I46, I71, I100, TT0,
200	CET197);
201	}
202
203	static const struct regmap_config lp3952_regmap = {
204	.reg_bits = 8,
205	.val_bits = 8,
206	.max_register = REG_MAX,
fc8e107e	207	.cache_type = REGCACHE_MAPLE,
d966c943 TM	208	};
d966c943 TM	209
b5a0b816 GS	210	static void gpio_set_low_action(void *data)
	211	{
	212	struct lp3952_led_array *priv = data;
	213
	214	gpiod_set_value(priv->enable_gpio, 0);
	215	}
	216
1fd9dadc	217	static int lp3952_probe(struct i2c_client *client)
d966c943 TM	218	{
	219	int status;
	220	struct lp3952_led_array *priv;
	221
	222	priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
	223	if (!priv)
	224	return -ENOMEM;
	225
	226	priv->client = client;
	227
	228	priv->enable_gpio = devm_gpiod_get(&client->dev, "nrst",
	229	GPIOD_OUT_HIGH);
	230	if (IS_ERR(priv->enable_gpio)) {
	231	status = PTR_ERR(priv->enable_gpio);
	232	dev_err(&client->dev, "Failed to enable gpio: %d\n", status);
	233	return status;
	234	}
	235
b5a0b816 GS	236	status = devm_add_action(&client->dev, gpio_set_low_action, priv);
	237	if (status)
	238	return status;
	239
d966c943 TM	240	priv->regmap = devm_regmap_init_i2c(client, &lp3952_regmap);
	241	if (IS_ERR(priv->regmap)) {
	242	int err = PTR_ERR(priv->regmap);
	243
	244	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	245	err);
	246	return err;
	247	}
	248
	249	i2c_set_clientdata(client, priv);
	250
	251	status = lp3952_configure(priv);
	252	if (status) {
	253	dev_err(&client->dev, "Probe failed. Device not found (%d)\n",
	254	status);
	255	return status;
	256	}
	257
	258	status = lp3952_register_led_classdev(priv);
	259	if (status) {
	260	dev_err(&client->dev, "Unable to register led_classdev: %d\n",
	261	status);
	262	return status;
	263	}
	264
	265	return 0;
	266	}
	267
d966c943	268	static const struct i2c_device_id lp3952_id[] = {
c0e3d2be	269	{ LP3952_NAME },
d966c943 TM	270	{}
d966c943 TM	271	};
aa73684c	272	MODULE_DEVICE_TABLE(i2c, lp3952_id);
d966c943	273
d966c943 TM	274	static struct i2c_driver lp3952_i2c_driver = {
	275	.driver = {
	276	.name = LP3952_NAME,
d966c943	277	},
d9ff8a8e	278	.probe = lp3952_probe,
d966c943 TM	279	.id_table = lp3952_id,
	280	};
	281
	282	module_i2c_driver(lp3952_i2c_driver);
	283
	284	MODULE_AUTHOR("Tony Makkiel <tony.makkiel@daqri.com>");
	285	MODULE_DESCRIPTION("lp3952 I2C LED controller driver");
	286	MODULE_LICENSE("GPL v2");