Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * TI LP855x Backlight Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *			Copyright (C) 2011 Texas Instruments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/backlight.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/platform_data/lp855x.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/pwm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) /* LP8550/1/2/3/6 Registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define LP855X_BRIGHTNESS_CTRL		0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define LP855X_DEVICE_CTRL		0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define LP855X_EEPROM_START		0xA0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define LP855X_EEPROM_END		0xA7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define LP8556_EPROM_START		0xA0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define LP8556_EPROM_END		0xAF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) /* LP8555/7 Registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define LP8557_BL_CMD			0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define LP8557_BL_MASK			0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define LP8557_BL_ON			0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define LP8557_BL_OFF			0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define LP8557_BRIGHTNESS_CTRL		0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define LP8557_CONFIG			0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #define LP8555_EPROM_START		0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define LP8555_EPROM_END		0x7A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define LP8557_EPROM_START		0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define LP8557_EPROM_END		0x1E
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define DEFAULT_BL_NAME		"lcd-backlight"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define MAX_BRIGHTNESS		255
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) enum lp855x_brightness_ctrl_mode {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	PWM_BASED = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	REGISTER_BASED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) struct lp855x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * struct lp855x_device_config
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * @pre_init_device: init device function call before updating the brightness
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * @reg_brightness: register address for brigthenss control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * @reg_devicectrl: register address for device control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * @post_init_device: late init device function call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) struct lp855x_device_config {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	int (*pre_init_device)(struct lp855x *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	u8 reg_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	u8 reg_devicectrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	int (*post_init_device)(struct lp855x *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) struct lp855x {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	const char *chipname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	enum lp855x_chip_id chip_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	enum lp855x_brightness_ctrl_mode mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	struct lp855x_device_config *cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	struct backlight_device *bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct lp855x_platform_data *pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct pwm_device *pwm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct regulator *supply;	/* regulator for VDD input */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	struct regulator *enable;	/* regulator for EN/VDDIO input */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	return i2c_smbus_write_byte_data(lp->client, reg, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) static int lp855x_update_bit(struct lp855x *lp, u8 reg, u8 mask, u8 data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	u8 tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	ret = i2c_smbus_read_byte_data(lp->client, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	tmp = (u8)ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	tmp &= ~mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	tmp |= data & mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return lp855x_write_byte(lp, reg, tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	u8 start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	switch (lp->chip_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	case LP8550:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	case LP8551:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	case LP8552:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	case LP8553:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		start = LP855X_EEPROM_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		end = LP855X_EEPROM_END;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	case LP8556:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		start = LP8556_EPROM_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		end = LP8556_EPROM_END;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	case LP8555:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		start = LP8555_EPROM_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		end = LP8555_EPROM_END;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	case LP8557:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		start = LP8557_EPROM_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		end = LP8557_EPROM_END;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	return addr >= start && addr <= end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static int lp8557_bl_off(struct lp855x *lp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	/* BL_ON = 0 before updating EPROM settings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 				LP8557_BL_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int lp8557_bl_on(struct lp855x *lp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	/* BL_ON = 1 after updating EPROM settings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 				LP8557_BL_ON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static struct lp855x_device_config lp855x_dev_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	.reg_brightness = LP855X_BRIGHTNESS_CTRL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	.reg_devicectrl = LP855X_DEVICE_CTRL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static struct lp855x_device_config lp8557_dev_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	.reg_brightness = LP8557_BRIGHTNESS_CTRL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	.reg_devicectrl = LP8557_CONFIG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	.pre_init_device = lp8557_bl_off,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	.post_init_device = lp8557_bl_on,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)  * Device specific configuration flow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)  *    a) pre_init_device(optional)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)  *    b) update the brightness register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  *    c) update device control register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  *    d) update ROM area(optional)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)  *    e) post_init_device(optional)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int lp855x_configure(struct lp855x *lp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	u8 val, addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	int i, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	struct lp855x_platform_data *pd = lp->pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	switch (lp->chip_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	case LP8550:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	case LP8551:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	case LP8552:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	case LP8553:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	case LP8556:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		lp->cfg = &lp855x_dev_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	case LP8555:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	case LP8557:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		lp->cfg = &lp8557_dev_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (lp->cfg->pre_init_device) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		ret = lp->cfg->pre_init_device(lp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			dev_err(lp->dev, "pre init device err: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	val = pd->initial_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	ret = lp855x_write_byte(lp, lp->cfg->reg_brightness, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	val = pd->device_control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	ret = lp855x_write_byte(lp, lp->cfg->reg_devicectrl, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (pd->size_program > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		for (i = 0; i < pd->size_program; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			addr = pd->rom_data[i].addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			val = pd->rom_data[i].val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			if (!lp855x_is_valid_rom_area(lp, addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			ret = lp855x_write_byte(lp, addr, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 				goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (lp->cfg->post_init_device) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		ret = lp->cfg->post_init_device(lp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 			dev_err(lp->dev, "post init device err: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	unsigned int period = lp->pdata->period_ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	unsigned int duty = br * period / max_br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	struct pwm_device *pwm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	/* request pwm device with the consumer name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (!lp->pwm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		pwm = devm_pwm_get(lp->dev, lp->chipname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		if (IS_ERR(pwm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		lp->pwm = pwm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		 * FIXME: pwm_apply_args() should be removed when switching to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		 * the atomic PWM API.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		pwm_apply_args(pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	pwm_config(lp->pwm, duty, period);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (duty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		pwm_enable(lp->pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		pwm_disable(lp->pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static int lp855x_bl_update_status(struct backlight_device *bl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	struct lp855x *lp = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	int brightness = bl->props.brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		brightness = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (lp->mode == PWM_BASED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		lp855x_pwm_ctrl(lp, brightness, bl->props.max_brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	else if (lp->mode == REGISTER_BASED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		lp855x_write_byte(lp, lp->cfg->reg_brightness, (u8)brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static const struct backlight_ops lp855x_bl_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	.options = BL_CORE_SUSPENDRESUME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	.update_status = lp855x_bl_update_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static int lp855x_backlight_register(struct lp855x *lp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	struct backlight_device *bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	struct backlight_properties props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	struct lp855x_platform_data *pdata = lp->pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	const char *name = pdata->name ? : DEFAULT_BL_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	memset(&props, 0, sizeof(props));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	props.type = BACKLIGHT_PLATFORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	props.max_brightness = MAX_BRIGHTNESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	if (pdata->initial_brightness > props.max_brightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		pdata->initial_brightness = props.max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	props.brightness = pdata->initial_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 				       &lp855x_bl_ops, &props);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	if (IS_ERR(bl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		return PTR_ERR(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	lp->bl = bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static ssize_t lp855x_get_chip_id(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 				struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	struct lp855x *lp = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 				     struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	struct lp855x *lp = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	char *strmode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	if (lp->mode == PWM_BASED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		strmode = "pwm based";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	else if (lp->mode == REGISTER_BASED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		strmode = "register based";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) static DEVICE_ATTR(bl_ctl_mode, S_IRUGO, lp855x_get_bl_ctl_mode, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) static struct attribute *lp855x_attributes[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	&dev_attr_chip_id.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	&dev_attr_bl_ctl_mode.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) static const struct attribute_group lp855x_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	.attrs = lp855x_attributes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) static int lp855x_parse_dt(struct lp855x *lp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	struct device *dev = lp->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	struct device_node *node = dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	struct lp855x_platform_data *pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	int rom_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	if (!node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		dev_err(dev, "no platform data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	if (!pdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	of_property_read_string(node, "bl-name", &pdata->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	of_property_read_u8(node, "dev-ctrl", &pdata->device_control);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	of_property_read_u8(node, "init-brt", &pdata->initial_brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	of_property_read_u32(node, "pwm-period", &pdata->period_ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	/* Fill ROM platform data if defined */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	rom_length = of_get_child_count(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	if (rom_length > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		struct lp855x_rom_data *rom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		struct device_node *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		rom = devm_kcalloc(dev, rom_length, sizeof(*rom), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		if (!rom)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		for_each_child_of_node(node, child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 			of_property_read_u8(child, "rom-addr", &rom[i].addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 			of_property_read_u8(child, "rom-val", &rom[i].val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 			i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		pdata->size_program = rom_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		pdata->rom_data = &rom[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	lp->pdata = pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) static int lp855x_parse_dt(struct lp855x *lp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	struct lp855x *lp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	lp = devm_kzalloc(&cl->dev, sizeof(struct lp855x), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	if (!lp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	lp->client = cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	lp->dev = &cl->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	lp->chipname = id->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	lp->chip_id = id->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	lp->pdata = dev_get_platdata(&cl->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	if (!lp->pdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		ret = lp855x_parse_dt(lp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	if (lp->pdata->period_ns > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		lp->mode = PWM_BASED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 		lp->mode = REGISTER_BASED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	lp->supply = devm_regulator_get(lp->dev, "power");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	if (IS_ERR(lp->supply)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		if (PTR_ERR(lp->supply) == -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 			return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 		lp->supply = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	lp->enable = devm_regulator_get_optional(lp->dev, "enable");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	if (IS_ERR(lp->enable)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 		ret = PTR_ERR(lp->enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 		if (ret == -ENODEV) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 			lp->enable = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 			if (ret != -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 				dev_err(lp->dev, "error getting enable regulator: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 					ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	if (lp->supply) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 		ret = regulator_enable(lp->supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 		if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 			dev_err(&cl->dev, "failed to enable supply: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	if (lp->enable) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 		ret = regulator_enable(lp->enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 		if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 			dev_err(lp->dev, "failed to enable vddio: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 			goto disable_supply;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 		 * LP8555 datasheet says t_RESPONSE (time between VDDIO and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 		 * I2C) is 1ms.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 		usleep_range(1000, 2000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	i2c_set_clientdata(cl, lp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	ret = lp855x_configure(lp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 		dev_err(lp->dev, "device config err: %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 		goto disable_vddio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 	ret = lp855x_backlight_register(lp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 		dev_err(lp->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 			"failed to register backlight. err: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 		goto disable_vddio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 	ret = sysfs_create_group(&lp->dev->kobj, &lp855x_attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 		dev_err(lp->dev, "failed to register sysfs. err: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 		goto disable_vddio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) 	backlight_update_status(lp->bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) disable_vddio:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 	if (lp->enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 		regulator_disable(lp->enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) disable_supply:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 	if (lp->supply)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) 		regulator_disable(lp->supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) static int lp855x_remove(struct i2c_client *cl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) 	struct lp855x *lp = i2c_get_clientdata(cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 	lp->bl->props.brightness = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 	backlight_update_status(lp->bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) 	if (lp->enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) 		regulator_disable(lp->enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) 	if (lp->supply)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) 		regulator_disable(lp->supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 	sysfs_remove_group(&lp->dev->kobj, &lp855x_attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) static const struct of_device_id lp855x_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) 	{ .compatible = "ti,lp8550", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) 	{ .compatible = "ti,lp8551", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) 	{ .compatible = "ti,lp8552", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) 	{ .compatible = "ti,lp8553", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) 	{ .compatible = "ti,lp8555", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) 	{ .compatible = "ti,lp8556", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) 	{ .compatible = "ti,lp8557", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) MODULE_DEVICE_TABLE(of, lp855x_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) static const struct i2c_device_id lp855x_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) 	{"lp8550", LP8550},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) 	{"lp8551", LP8551},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) 	{"lp8552", LP8552},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) 	{"lp8553", LP8553},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) 	{"lp8555", LP8555},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) 	{"lp8556", LP8556},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) 	{"lp8557", LP8557},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) MODULE_DEVICE_TABLE(i2c, lp855x_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) static struct i2c_driver lp855x_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) 		   .name = "lp855x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) 		   .of_match_table = of_match_ptr(lp855x_dt_ids),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) 		   },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) 	.probe = lp855x_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) 	.remove = lp855x_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) 	.id_table = lp855x_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) module_i2c_driver(lp855x_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) MODULE_DESCRIPTION("Texas Instruments LP855x Backlight driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) MODULE_LICENSE("GPL");