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)  * sky81452-backlight.c	SKY81452 backlight driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright 2014 Skyworks Solutions Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/backlight.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /* registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define SKY81452_REG0	0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define SKY81452_REG1	0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define SKY81452_REG2	0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define SKY81452_REG4	0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define SKY81452_REG5	0x05
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) /* bit mask */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define SKY81452_CS	0xFF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define SKY81452_EN	0x3F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define SKY81452_IGPW	0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define SKY81452_PWMMD	0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define SKY81452_PHASE	0x08
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define SKY81452_ILIM	0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #define SKY81452_VSHRT	0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define SKY81452_OCP	0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define SKY81452_OTMP	0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define SKY81452_SHRT	0x3F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define SKY81452_OPN	0x3F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define SKY81452_DEFAULT_NAME "lcd-backlight"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define SKY81452_MAX_BRIGHTNESS	(SKY81452_CS + 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * struct sky81452_platform_data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * @name:	backlight driver name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  *		If it is not defined, default name is lcd-backlight.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * @gpiod_enable:GPIO descriptor which control EN pin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * @enable:	Enable mask for current sink channel 1, 2, 3, 4, 5 and 6.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * @ignore_pwm:	true if DPWMI should be ignored.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * @dpwm_mode:	true is DPWM dimming mode, otherwise Analog dimming mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * @phase_shift:true is phase shift mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * @short_detection_threshold:	It should be one of 4, 5, 6 and 7V.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * @boost_current_limit:	It should be one of 2300, 2750mA.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) struct sky81452_bl_platform_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	struct gpio_desc *gpiod_enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	unsigned int enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	bool ignore_pwm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	bool dpwm_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	bool phase_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	unsigned int short_detection_threshold;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	unsigned int boost_current_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #define CTZ(b) __builtin_ctz(b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static int sky81452_bl_update_status(struct backlight_device *bd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	const struct sky81452_bl_platform_data *pdata =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			dev_get_platdata(bd->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	const unsigned int brightness = (unsigned int)bd->props.brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct regmap *regmap = bl_get_data(bd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (brightness > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 					pdata->enable << CTZ(SKY81452_EN));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static const struct backlight_ops sky81452_bl_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	.update_status = sky81452_bl_update_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) static ssize_t sky81452_bl_store_enable(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		struct device_attribute *attr, const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	unsigned long value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	ret = kstrtoul(buf, 16, &value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 					value << CTZ(SKY81452_EN));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static ssize_t sky81452_bl_show_open_short(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	unsigned int reg, value = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	char tmp[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	int i, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	ret = regmap_read(regmap, reg, &value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (value & SKY81452_SHRT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		*buf = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		for (i = 0; i < 6; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			if (value & 0x01) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 				sprintf(tmp, "%d ", i + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 				strcat(buf, tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			value >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		strcat(buf, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		strcpy(buf, "none\n");
^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) 	return strlen(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static ssize_t sky81452_bl_show_fault(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	struct regmap *regmap = bl_get_data(to_backlight_device(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	unsigned int value = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	ret = regmap_read(regmap, SKY81452_REG4, &value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	*buf = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (value & SKY81452_OCP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		strcat(buf, "over-current ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (value & SKY81452_OTMP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		strcat(buf, "over-temperature");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	strcat(buf, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	return strlen(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static struct attribute *sky81452_bl_attribute[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	&dev_attr_enable.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	&dev_attr_open.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	&dev_attr_short.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	&dev_attr_fault.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static const struct attribute_group sky81452_bl_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	.attrs = sky81452_bl_attribute,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 							struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	struct device_node *np = of_node_get(dev->of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	struct sky81452_bl_platform_data *pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	int num_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	unsigned int sources[6];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	if (!np) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		dev_err(dev, "backlight node not found.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		return ERR_PTR(-ENODATA);
^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) 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (!pdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	of_property_read_string(np, "name", &pdata->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	pdata->ignore_pwm = of_property_read_bool(np, "skyworks,ignore-pwm");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	pdata->dpwm_mode = of_property_read_bool(np, "skyworks,dpwm-mode");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	pdata->phase_shift = of_property_read_bool(np, "skyworks,phase-shift");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	pdata->gpiod_enable = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	ret = of_property_count_u32_elems(np, "led-sources");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		num_entry = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		if (num_entry > 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			num_entry = 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		ret = of_property_read_u32_array(np, "led-sources", sources,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 					num_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 			dev_err(dev, "led-sources node is invalid.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 			of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		pdata->enable = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		while (--num_entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			pdata->enable |= (1 << sources[num_entry]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	ret = of_property_read_u32(np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 			"skyworks,short-detection-threshold-volt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 			&pdata->short_detection_threshold);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		pdata->short_detection_threshold = 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	ret = of_property_read_u32(np, "skyworks,current-limit-mA",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			&pdata->boost_current_limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		pdata->boost_current_limit = 2750;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	return pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 							struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static int sky81452_bl_init_device(struct regmap *regmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		struct sky81452_bl_platform_data *pdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	unsigned int value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (pdata->boost_current_limit == 2300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		value |= SKY81452_ILIM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	else if (pdata->boost_current_limit != 2750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (pdata->short_detection_threshold < 4 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 				pdata->short_detection_threshold > 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	return regmap_write(regmap, SKY81452_REG2, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static int sky81452_bl_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	struct regmap *regmap = dev_get_drvdata(dev->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	struct sky81452_bl_platform_data *pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	struct backlight_device *bd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	struct backlight_properties props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	pdata = sky81452_bl_parse_dt(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	if (IS_ERR(pdata))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		return PTR_ERR(pdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	ret = sky81452_bl_init_device(regmap, pdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		dev_err(dev, "failed to initialize. err=%d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	memset(&props, 0, sizeof(props));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	props.max_brightness = SKY81452_MAX_BRIGHTNESS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	bd = devm_backlight_device_register(dev, name, dev, regmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 						&sky81452_bl_ops, &props);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (IS_ERR(bd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		dev_err(dev, "failed to register. err=%ld\n", PTR_ERR(bd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		return PTR_ERR(bd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	platform_set_drvdata(pdev, bd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	ret = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		dev_err(dev, "failed to create attribute. err=%d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static int sky81452_bl_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	const struct sky81452_bl_platform_data *pdata =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 						dev_get_platdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	struct backlight_device *bd = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	bd->props.power = FB_BLANK_UNBLANK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	bd->props.brightness = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	backlight_update_status(bd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	if (pdata->gpiod_enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		gpiod_set_value_cansleep(pdata->gpiod_enable, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) static const struct of_device_id sky81452_bl_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	{ .compatible = "skyworks,sky81452-backlight", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) MODULE_DEVICE_TABLE(of, sky81452_bl_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) static struct platform_driver sky81452_bl_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		.name = "sky81452-backlight",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		.of_match_table = of_match_ptr(sky81452_bl_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	.probe = sky81452_bl_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	.remove = sky81452_bl_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) module_platform_driver(sky81452_bl_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) MODULE_LICENSE("GPL v2");