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174 lines
3.7 KiB
174 lines
3.7 KiB
// 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 int 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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return 0; |
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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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