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// SPDX-License-Identifier: GPL-2.0-only
/*
* LCD / Backlight control code for Sharp SL-6000x (tosa)
*
* Copyright (c) 2005 Dirk Opfer
* Copyright (c) 2007,2008 Dmitry Baryshkov
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/gpio/consumer.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/slab.h>
#include <asm/mach/sharpsl_param.h>
#include "tosa_bl.h"
#define COMADJ_DEFAULT 97
#define DAC_CH1 0
#define DAC_CH2 1
struct tosa_bl_data {
struct i2c_client *i2c;
struct backlight_device *bl;
struct gpio_desc *gpio;
int comadj;
};
static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
{
struct spi_device *spi = dev_get_platdata(&data->i2c->dev);
i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);
/* SetBacklightDuty */
i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));
/* SetBacklightVR */
gpiod_set_value(data->gpio, brightness & 0x100);
tosa_bl_enable(spi, brightness);
}
static int tosa_bl_update_status(struct backlight_device *dev)
{
struct backlight_properties *props = &dev->props;
struct tosa_bl_data *data = bl_get_data(dev);
int power = max(props->power, props->fb_blank);
int brightness = props->brightness;
if (power)
brightness = 0;
tosa_bl_set_backlight(data, brightness);
return 0;
}
static int tosa_bl_get_brightness(struct backlight_device *dev)
{
struct backlight_properties *props = &dev->props;
return props->brightness;
}
static const struct backlight_ops bl_ops = {
.get_brightness = tosa_bl_get_brightness,
.update_status = tosa_bl_update_status,
};
static int tosa_bl_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct backlight_properties props;
struct tosa_bl_data *data;
int ret = 0;
data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
data->gpio = devm_gpiod_get(&client->dev, "backlight", GPIOD_OUT_LOW);
ret = PTR_ERR_OR_ZERO(data->gpio);
if (ret) {
dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
return ret;
}
i2c_set_clientdata(client, data);
data->i2c = client;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = 512 - 1;
data->bl = devm_backlight_device_register(&client->dev, "tosa-bl",
&client->dev, data, &bl_ops,
&props);
if (IS_ERR(data->bl)) {
ret = PTR_ERR(data->bl);
goto err_reg;
}
data->bl->props.brightness = 69;
data->bl->props.power = FB_BLANK_UNBLANK;
backlight_update_status(data->bl);
return 0;
err_reg:
data->bl = NULL;
return ret;
}
static int tosa_bl_remove(struct i2c_client *client)
{
struct tosa_bl_data *data = i2c_get_clientdata(client);
data->bl = NULL;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int tosa_bl_suspend(struct device *dev)
{
struct tosa_bl_data *data = dev_get_drvdata(dev);
tosa_bl_set_backlight(data, 0);
return 0;
}
static int tosa_bl_resume(struct device *dev)
{
struct tosa_bl_data *data = dev_get_drvdata(dev);
backlight_update_status(data->bl);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume);
static const struct i2c_device_id tosa_bl_id[] = {
{ "tosa-bl", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, tosa_bl_id);
static struct i2c_driver tosa_bl_driver = {
.driver = {
.name = "tosa-bl",
.pm = &tosa_bl_pm_ops,
},
.probe = tosa_bl_probe,
.remove = tosa_bl_remove,
.id_table = tosa_bl_id,
};
module_i2c_driver(tosa_bl_driver);
MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
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