Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Bryan Wu <cooloney@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>tirimbino
Gyungoh Yoo
10 years ago
committed by
Lee Jones
parent
2698dc2229
commit
f705806c9f
@ -0,0 +1,353 @@ |
||||
/*
|
||||
* sky81452-backlight.c SKY81452 backlight driver |
||||
* |
||||
* Copyright 2014 Skyworks Solutions Inc. |
||||
* Author : Gyungoh Yoo <jack.yoo@skyworksinc.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. |
||||
* |
||||
* This program is distributed in the hope that it will be useful, but |
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||||
* General Public License for more details. |
||||
* |
||||
* You should have received a copy of the GNU General Public License along |
||||
* with this program; if not, see <http://www.gnu.org/licenses/>.
|
||||
*/ |
||||
|
||||
#include <linux/backlight.h> |
||||
#include <linux/err.h> |
||||
#include <linux/gpio.h> |
||||
#include <linux/init.h> |
||||
#include <linux/kernel.h> |
||||
#include <linux/module.h> |
||||
#include <linux/of.h> |
||||
#include <linux/of_gpio.h> |
||||
#include <linux/platform_device.h> |
||||
#include <linux/regmap.h> |
||||
#include <linux/platform_data/sky81452-backlight.h> |
||||
#include <linux/slab.h> |
||||
|
||||
/* registers */ |
||||
#define SKY81452_REG0 0x00 |
||||
#define SKY81452_REG1 0x01 |
||||
#define SKY81452_REG2 0x02 |
||||
#define SKY81452_REG4 0x04 |
||||
#define SKY81452_REG5 0x05 |
||||
|
||||
/* bit mask */ |
||||
#define SKY81452_CS 0xFF |
||||
#define SKY81452_EN 0x3F |
||||
#define SKY81452_IGPW 0x20 |
||||
#define SKY81452_PWMMD 0x10 |
||||
#define SKY81452_PHASE 0x08 |
||||
#define SKY81452_ILIM 0x04 |
||||
#define SKY81452_VSHRT 0x03 |
||||
#define SKY81452_OCP 0x80 |
||||
#define SKY81452_OTMP 0x40 |
||||
#define SKY81452_SHRT 0x3F |
||||
#define SKY81452_OPN 0x3F |
||||
|
||||
#define SKY81452_DEFAULT_NAME "lcd-backlight" |
||||
#define SKY81452_MAX_BRIGHTNESS (SKY81452_CS + 1) |
||||
|
||||
#define CTZ(b) __builtin_ctz(b) |
||||
|
||||
static int sky81452_bl_update_status(struct backlight_device *bd) |
||||
{ |
||||
const struct sky81452_bl_platform_data *pdata = |
||||
dev_get_platdata(bd->dev.parent); |
||||
const unsigned int brightness = (unsigned int)bd->props.brightness; |
||||
struct regmap *regmap = bl_get_data(bd); |
||||
int ret; |
||||
|
||||
if (brightness > 0) { |
||||
ret = regmap_write(regmap, SKY81452_REG0, brightness - 1); |
||||
if (IS_ERR_VALUE(ret)) |
||||
return ret; |
||||
|
||||
return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, |
||||
pdata->enable << CTZ(SKY81452_EN)); |
||||
} |
||||
|
||||
return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0); |
||||
} |
||||
|
||||
static const struct backlight_ops sky81452_bl_ops = { |
||||
.update_status = sky81452_bl_update_status, |
||||
}; |
||||
|
||||
static ssize_t sky81452_bl_store_enable(struct device *dev, |
||||
struct device_attribute *attr, const char *buf, size_t count) |
||||
{ |
||||
struct regmap *regmap = bl_get_data(to_backlight_device(dev)); |
||||
unsigned long value; |
||||
int ret; |
||||
|
||||
ret = kstrtoul(buf, 16, &value); |
||||
if (IS_ERR_VALUE(ret)) |
||||
return ret; |
||||
|
||||
ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, |
||||
value << CTZ(SKY81452_EN)); |
||||
if (IS_ERR_VALUE(ret)) |
||||
return ret; |
||||
|
||||
return count; |
||||
} |
||||
|
||||
static ssize_t sky81452_bl_show_open_short(struct device *dev, |
||||
struct device_attribute *attr, char *buf) |
||||
{ |
||||
struct regmap *regmap = bl_get_data(to_backlight_device(dev)); |
||||
unsigned int reg, value = 0; |
||||
char tmp[3]; |
||||
int i, ret; |
||||
|
||||
reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4; |
||||
ret = regmap_read(regmap, reg, &value); |
||||
if (IS_ERR_VALUE(ret)) |
||||
return ret; |
||||
|
||||
if (value & SKY81452_SHRT) { |
||||
*buf = 0; |
||||
for (i = 0; i < 6; i++) { |
||||
if (value & 0x01) { |
||||
sprintf(tmp, "%d ", i + 1); |
||||
strcat(buf, tmp); |
||||
} |
||||
value >>= 1; |
||||
} |
||||
strcat(buf, "\n"); |
||||
} else { |
||||
strcpy(buf, "none\n"); |
||||
} |
||||
|
||||
return strlen(buf); |
||||
} |
||||
|
||||
static ssize_t sky81452_bl_show_fault(struct device *dev, |
||||
struct device_attribute *attr, char *buf) |
||||
{ |
||||
struct regmap *regmap = bl_get_data(to_backlight_device(dev)); |
||||
unsigned int value = 0; |
||||
int ret; |
||||
|
||||
ret = regmap_read(regmap, SKY81452_REG4, &value); |
||||
if (IS_ERR_VALUE(ret)) |
||||
return ret; |
||||
|
||||
*buf = 0; |
||||
|
||||
if (value & SKY81452_OCP) |
||||
strcat(buf, "over-current "); |
||||
|
||||
if (value & SKY81452_OTMP) |
||||
strcat(buf, "over-temperature"); |
||||
|
||||
strcat(buf, "\n"); |
||||
return strlen(buf); |
||||
} |
||||
|
||||
static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable); |
||||
static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL); |
||||
static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL); |
||||
static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL); |
||||
|
||||
static struct attribute *sky81452_bl_attribute[] = { |
||||
&dev_attr_enable.attr, |
||||
&dev_attr_open.attr, |
||||
&dev_attr_short.attr, |
||||
&dev_attr_fault.attr, |
||||
NULL |
||||
}; |
||||
|
||||
static const struct attribute_group sky81452_bl_attr_group = { |
||||
.attrs = sky81452_bl_attribute, |
||||
}; |
||||
|
||||
#ifdef CONFIG_OF |
||||
static struct sky81452_bl_platform_data *sky81452_bl_parse_dt( |
||||
struct device *dev) |
||||
{ |
||||
struct device_node *np = of_node_get(dev->of_node); |
||||
struct sky81452_bl_platform_data *pdata; |
||||
int num_entry; |
||||
unsigned int sources[6]; |
||||
int ret; |
||||
|
||||
if (!np) { |
||||
dev_err(dev, "backlight node not found.\n"); |
||||
return ERR_PTR(-ENODATA); |
||||
} |
||||
|
||||
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
||||
if (!pdata) { |
||||
of_node_put(np); |
||||
return ERR_PTR(-ENOMEM); |
||||
} |
||||
|
||||
of_property_read_string(np, "name", &pdata->name); |
||||
pdata->ignore_pwm = of_property_read_bool(np, "skyworks,ignore-pwm"); |
||||
pdata->dpwm_mode = of_property_read_bool(np, "skyworks,dpwm-mode"); |
||||
pdata->phase_shift = of_property_read_bool(np, "skyworks,phase-shift"); |
||||
pdata->gpio_enable = of_get_gpio(np, 0); |
||||
|
||||
ret = of_property_count_u32_elems(np, "led-sources"); |
||||
if (IS_ERR_VALUE(ret)) { |
||||
pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN); |
||||
} else { |
||||
num_entry = ret; |
||||
if (num_entry > 6) |
||||
num_entry = 6; |
||||
|
||||
ret = of_property_read_u32_array(np, "led-sources", sources, |
||||
num_entry); |
||||
if (IS_ERR_VALUE(ret)) { |
||||
dev_err(dev, "led-sources node is invalid.\n"); |
||||
return ERR_PTR(-EINVAL); |
||||
} |
||||
|
||||
pdata->enable = 0; |
||||
while (--num_entry) |
||||
pdata->enable |= (1 << sources[num_entry]); |
||||
} |
||||
|
||||
ret = of_property_read_u32(np, |
||||
"skyworks,short-detection-threshold-volt", |
||||
&pdata->short_detection_threshold); |
||||
if (IS_ERR_VALUE(ret)) |
||||
pdata->short_detection_threshold = 7; |
||||
|
||||
ret = of_property_read_u32(np, "skyworks,current-limit-mA", |
||||
&pdata->boost_current_limit); |
||||
if (IS_ERR_VALUE(ret)) |
||||
pdata->boost_current_limit = 2750; |
||||
|
||||
of_node_put(np); |
||||
return pdata; |
||||
} |
||||
#else |
||||
static struct sky81452_bl_platform_data *sky81452_bl_parse_dt( |
||||
struct device *dev) |
||||
{ |
||||
return ERR_PTR(-EINVAL); |
||||
} |
||||
#endif |
||||
|
||||
static int sky81452_bl_init_device(struct regmap *regmap, |
||||
struct sky81452_bl_platform_data *pdata) |
||||
{ |
||||
unsigned int value; |
||||
|
||||
value = pdata->ignore_pwm ? SKY81452_IGPW : 0; |
||||
value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0; |
||||
value |= pdata->phase_shift ? 0 : SKY81452_PHASE; |
||||
|
||||
if (pdata->boost_current_limit == 2300) |
||||
value |= SKY81452_ILIM; |
||||
else if (pdata->boost_current_limit != 2750) |
||||
return -EINVAL; |
||||
|
||||
if (pdata->short_detection_threshold < 4 || |
||||
pdata->short_detection_threshold > 7) |
||||
return -EINVAL; |
||||
value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT); |
||||
|
||||
return regmap_write(regmap, SKY81452_REG2, value); |
||||
} |
||||
|
||||
static int sky81452_bl_probe(struct platform_device *pdev) |
||||
{ |
||||
struct device *dev = &pdev->dev; |
||||
struct regmap *regmap = dev_get_drvdata(dev->parent); |
||||
struct sky81452_bl_platform_data *pdata = dev_get_platdata(dev); |
||||
struct backlight_device *bd; |
||||
struct backlight_properties props; |
||||
const char *name; |
||||
int ret; |
||||
|
||||
if (!pdata) { |
||||
pdata = sky81452_bl_parse_dt(dev); |
||||
if (IS_ERR(pdata)) |
||||
return PTR_ERR(pdata); |
||||
} |
||||
|
||||
if (gpio_is_valid(pdata->gpio_enable)) { |
||||
ret = devm_gpio_request_one(dev, pdata->gpio_enable, |
||||
GPIOF_OUT_INIT_HIGH, "sky81452-en"); |
||||
if (IS_ERR_VALUE(ret)) { |
||||
dev_err(dev, "failed to request GPIO. err=%d\n", ret); |
||||
return ret; |
||||
} |
||||
} |
||||
|
||||
ret = sky81452_bl_init_device(regmap, pdata); |
||||
if (IS_ERR_VALUE(ret)) { |
||||
dev_err(dev, "failed to initialize. err=%d\n", ret); |
||||
return ret; |
||||
} |
||||
|
||||
memset(&props, 0, sizeof(props)); |
||||
props.max_brightness = SKY81452_MAX_BRIGHTNESS, |
||||
name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME; |
||||
bd = devm_backlight_device_register(dev, name, dev, regmap, |
||||
&sky81452_bl_ops, &props); |
||||
if (IS_ERR(bd)) { |
||||
dev_err(dev, "failed to register. err=%ld\n", PTR_ERR(bd)); |
||||
return PTR_ERR(bd); |
||||
} |
||||
|
||||
platform_set_drvdata(pdev, bd); |
||||
|
||||
ret = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group); |
||||
if (IS_ERR_VALUE(ret)) { |
||||
dev_err(dev, "failed to create attribute. err=%d\n", ret); |
||||
return ret; |
||||
} |
||||
|
||||
return ret; |
||||
} |
||||
|
||||
static int sky81452_bl_remove(struct platform_device *pdev) |
||||
{ |
||||
const struct sky81452_bl_platform_data *pdata = |
||||
dev_get_platdata(&pdev->dev); |
||||
struct backlight_device *bd = platform_get_drvdata(pdev); |
||||
|
||||
sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group); |
||||
|
||||
bd->props.power = FB_BLANK_UNBLANK; |
||||
bd->props.brightness = 0; |
||||
backlight_update_status(bd); |
||||
|
||||
if (gpio_is_valid(pdata->gpio_enable)) |
||||
gpio_set_value_cansleep(pdata->gpio_enable, 0); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
#ifdef CONFIG_OF |
||||
static const struct of_device_id sky81452_bl_of_match[] = { |
||||
{ .compatible = "skyworks,sky81452-backlight", }, |
||||
{ } |
||||
}; |
||||
MODULE_DEVICE_TABLE(of, sky81452_bl_of_match); |
||||
#endif |
||||
|
||||
static struct platform_driver sky81452_bl_driver = { |
||||
.driver = { |
||||
.name = "sky81452-backlight", |
||||
.of_match_table = of_match_ptr(sky81452_bl_of_match), |
||||
}, |
||||
.probe = sky81452_bl_probe, |
||||
.remove = sky81452_bl_remove, |
||||
}; |
||||
|
||||
module_platform_driver(sky81452_bl_driver); |
||||
|
||||
MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver"); |
||||
MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>"); |
||||
MODULE_LICENSE("GPL v2"); |
||||
@ -0,0 +1,46 @@ |
||||
/*
|
||||
* sky81452.h SKY81452 backlight driver |
||||
* |
||||
* Copyright 2014 Skyworks Solutions Inc. |
||||
* Author : Gyungoh Yoo <jack.yoo@skyworksinc.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. |
||||
* |
||||
* This program is distributed in the hope that it will be useful, but |
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||||
* General Public License for more details. |
||||
* |
||||
* You should have received a copy of the GNU General Public License along |
||||
* with this program; if not, see <http://www.gnu.org/licenses/>.
|
||||
*/ |
||||
|
||||
#ifndef _SKY81452_BACKLIGHT_H |
||||
#define _SKY81452_BACKLIGHT_H |
||||
|
||||
/**
|
||||
* struct sky81452_platform_data |
||||
* @name: backlight driver name. |
||||
If it is not defined, default name is lcd-backlight. |
||||
* @gpio_enable:GPIO number which control EN pin |
||||
* @enable: Enable mask for current sink channel 1, 2, 3, 4, 5 and 6. |
||||
* @ignore_pwm: true if DPWMI should be ignored. |
||||
* @dpwm_mode: true is DPWM dimming mode, otherwise Analog dimming mode. |
||||
* @phase_shift:true is phase shift mode. |
||||
* @short_detecion_threshold: It should be one of 4, 5, 6 and 7V. |
||||
* @boost_current_limit: It should be one of 2300, 2750mA. |
||||
*/ |
||||
struct sky81452_bl_platform_data { |
||||
const char *name; |
||||
int gpio_enable; |
||||
unsigned int enable; |
||||
bool ignore_pwm; |
||||
bool dpwm_mode; |
||||
bool phase_shift; |
||||
unsigned int short_detection_threshold; |
||||
unsigned int boost_current_limit; |
||||
}; |
||||
|
||||
#endif |
||||
Loading…
Reference in new issue