162 lines
4.1 KiB
C
162 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Sanyo LV5207LP LED Driver
|
|
*
|
|
* Copyright (C) 2013 Ideas on board SPRL
|
|
*
|
|
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
|
*/
|
|
|
|
#include <linux/backlight.h>
|
|
#include <linux/err.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_data/lv5207lp.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define LV5207LP_CTRL1 0x00
|
|
#define LV5207LP_CPSW (1 << 7)
|
|
#define LV5207LP_SCTEN (1 << 6)
|
|
#define LV5207LP_C10 (1 << 5)
|
|
#define LV5207LP_CKSW (1 << 4)
|
|
#define LV5207LP_RSW (1 << 3)
|
|
#define LV5207LP_GSW (1 << 2)
|
|
#define LV5207LP_BSW (1 << 1)
|
|
#define LV5207LP_CTRL2 0x01
|
|
#define LV5207LP_MSW (1 << 7)
|
|
#define LV5207LP_MLED4 (1 << 6)
|
|
#define LV5207LP_RED 0x02
|
|
#define LV5207LP_GREEN 0x03
|
|
#define LV5207LP_BLUE 0x04
|
|
|
|
#define LV5207LP_MAX_BRIGHTNESS 32
|
|
|
|
struct lv5207lp {
|
|
struct i2c_client *client;
|
|
struct backlight_device *backlight;
|
|
struct lv5207lp_platform_data *pdata;
|
|
};
|
|
|
|
static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data)
|
|
{
|
|
return i2c_smbus_write_byte_data(lv->client, reg, data);
|
|
}
|
|
|
|
static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
|
|
{
|
|
struct lv5207lp *lv = bl_get_data(backlight);
|
|
int brightness = backlight->props.brightness;
|
|
|
|
if (backlight->props.power != FB_BLANK_UNBLANK ||
|
|
backlight->props.fb_blank != FB_BLANK_UNBLANK ||
|
|
backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
|
|
brightness = 0;
|
|
|
|
if (brightness) {
|
|
lv5207lp_write(lv, LV5207LP_CTRL1,
|
|
LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW);
|
|
lv5207lp_write(lv, LV5207LP_CTRL2,
|
|
LV5207LP_MSW | LV5207LP_MLED4 |
|
|
(brightness - 1));
|
|
} else {
|
|
lv5207lp_write(lv, LV5207LP_CTRL1, 0);
|
|
lv5207lp_write(lv, LV5207LP_CTRL2, 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lv5207lp_backlight_check_fb(struct backlight_device *backlight,
|
|
struct fb_info *info)
|
|
{
|
|
struct lv5207lp *lv = bl_get_data(backlight);
|
|
|
|
return lv->pdata->fbdev == NULL || lv->pdata->fbdev == info->dev;
|
|
}
|
|
|
|
static const struct backlight_ops lv5207lp_backlight_ops = {
|
|
.options = BL_CORE_SUSPENDRESUME,
|
|
.update_status = lv5207lp_backlight_update_status,
|
|
.check_fb = lv5207lp_backlight_check_fb,
|
|
};
|
|
|
|
static int lv5207lp_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct lv5207lp_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
struct backlight_device *backlight;
|
|
struct backlight_properties props;
|
|
struct lv5207lp *lv;
|
|
|
|
if (pdata == NULL) {
|
|
dev_err(&client->dev, "No platform data supplied\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_BYTE_DATA)) {
|
|
dev_warn(&client->dev,
|
|
"I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
|
|
return -EIO;
|
|
}
|
|
|
|
lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL);
|
|
if (!lv)
|
|
return -ENOMEM;
|
|
|
|
lv->client = client;
|
|
lv->pdata = pdata;
|
|
|
|
memset(&props, 0, sizeof(props));
|
|
props.type = BACKLIGHT_RAW;
|
|
props.max_brightness = min_t(unsigned int, pdata->max_value,
|
|
LV5207LP_MAX_BRIGHTNESS);
|
|
props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
|
|
props.max_brightness);
|
|
|
|
backlight = devm_backlight_device_register(&client->dev,
|
|
dev_name(&client->dev), &lv->client->dev,
|
|
lv, &lv5207lp_backlight_ops, &props);
|
|
if (IS_ERR(backlight)) {
|
|
dev_err(&client->dev, "failed to register backlight\n");
|
|
return PTR_ERR(backlight);
|
|
}
|
|
|
|
backlight_update_status(backlight);
|
|
i2c_set_clientdata(client, backlight);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lv5207lp_remove(struct i2c_client *client)
|
|
{
|
|
struct backlight_device *backlight = i2c_get_clientdata(client);
|
|
|
|
backlight->props.brightness = 0;
|
|
backlight_update_status(backlight);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lv5207lp_ids[] = {
|
|
{ "lv5207lp", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lv5207lp_ids);
|
|
|
|
static struct i2c_driver lv5207lp_driver = {
|
|
.driver = {
|
|
.name = "lv5207lp",
|
|
},
|
|
.probe = lv5207lp_probe,
|
|
.remove = lv5207lp_remove,
|
|
.id_table = lv5207lp_ids,
|
|
};
|
|
|
|
module_i2c_driver(lv5207lp_driver);
|
|
|
|
MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver");
|
|
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
|
|
MODULE_LICENSE("GPL");
|