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