| /* |
| * LCD / Backlight control code for Sharp SL-6000x (tosa) |
| * |
| * Copyright (c) 2005 Dirk Opfer |
| * Copyright (c) 2007,2008 Dmitry Baryshkov |
| * |
| * 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. |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/device.h> |
| #include <linux/spi/spi.h> |
| #include <linux/i2c.h> |
| #include <linux/gpio.h> |
| #include <linux/fb.h> |
| #include <linux/backlight.h> |
| #include <linux/slab.h> |
| |
| #include <asm/mach/sharpsl_param.h> |
| |
| #include <mach/tosa.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; |
| |
| int comadj; |
| }; |
| |
| static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness) |
| { |
| struct spi_device *spi = data->i2c->dev.platform_data; |
| |
| 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 */ |
| gpio_set_value(TOSA_GPIO_BL_C20MA, 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 = dev_get_drvdata(&dev->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 __devinit tosa_bl_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct backlight_properties props; |
| struct tosa_bl_data *data = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL); |
| int ret = 0; |
| if (!data) |
| return -ENOMEM; |
| |
| data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj; |
| |
| ret = gpio_request(TOSA_GPIO_BL_C20MA, "backlight"); |
| if (ret) { |
| dev_dbg(&data->bl->dev, "Unable to request gpio!\n"); |
| goto err_gpio_bl; |
| } |
| ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0); |
| if (ret) |
| goto err_gpio_dir; |
| |
| i2c_set_clientdata(client, data); |
| data->i2c = client; |
| |
| memset(&props, 0, sizeof(struct backlight_properties)); |
| props.max_brightness = 512 - 1; |
| data->bl = backlight_device_register("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; |
| i2c_set_clientdata(client, NULL); |
| err_gpio_dir: |
| gpio_free(TOSA_GPIO_BL_C20MA); |
| err_gpio_bl: |
| kfree(data); |
| return ret; |
| } |
| |
| static int __devexit tosa_bl_remove(struct i2c_client *client) |
| { |
| struct tosa_bl_data *data = i2c_get_clientdata(client); |
| |
| backlight_device_unregister(data->bl); |
| data->bl = NULL; |
| i2c_set_clientdata(client, NULL); |
| |
| gpio_free(TOSA_GPIO_BL_C20MA); |
| |
| kfree(data); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm) |
| { |
| struct tosa_bl_data *data = i2c_get_clientdata(client); |
| |
| tosa_bl_set_backlight(data, 0); |
| |
| return 0; |
| } |
| |
| static int tosa_bl_resume(struct i2c_client *client) |
| { |
| struct tosa_bl_data *data = i2c_get_clientdata(client); |
| |
| backlight_update_status(data->bl); |
| return 0; |
| } |
| #else |
| #define tosa_bl_suspend NULL |
| #define tosa_bl_resume NULL |
| #endif |
| |
| static const struct i2c_device_id tosa_bl_id[] = { |
| { "tosa-bl", 0 }, |
| { }, |
| }; |
| |
| |
| static struct i2c_driver tosa_bl_driver = { |
| .driver = { |
| .name = "tosa-bl", |
| .owner = THIS_MODULE, |
| }, |
| .probe = tosa_bl_probe, |
| .remove = __devexit_p(tosa_bl_remove), |
| .suspend = tosa_bl_suspend, |
| .resume = tosa_bl_resume, |
| .id_table = tosa_bl_id, |
| }; |
| |
| static int __init tosa_bl_init(void) |
| { |
| return i2c_add_driver(&tosa_bl_driver); |
| } |
| |
| static void __exit tosa_bl_exit(void) |
| { |
| i2c_del_driver(&tosa_bl_driver); |
| } |
| |
| module_init(tosa_bl_init); |
| module_exit(tosa_bl_exit); |
| |
| MODULE_AUTHOR("Dmitry Baryshkov"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); |
| |