2 * LCD / Backlight control code for Sharp SL-6000x (tosa)
4 * Copyright (c) 2005 Dirk Opfer
5 * Copyright (c) 2007,2008 Dmitry Baryshkov
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/spi/spi.h>
17 #include <linux/i2c.h>
18 #include <linux/gpio.h>
20 #include <linux/backlight.h>
21 #include <linux/slab.h>
23 #include <asm/mach/sharpsl_param.h>
25 #include <mach/tosa.h>
27 #define COMADJ_DEFAULT 97
33 struct i2c_client *i2c;
34 struct backlight_device *bl;
39 static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
41 struct spi_device *spi = data->i2c->dev.platform_data;
43 i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);
45 /* SetBacklightDuty */
46 i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));
49 gpio_set_value(TOSA_GPIO_BL_C20MA, brightness & 0x100);
51 tosa_bl_enable(spi, brightness);
54 static int tosa_bl_update_status(struct backlight_device *dev)
56 struct backlight_properties *props = &dev->props;
57 struct tosa_bl_data *data = dev_get_drvdata(&dev->dev);
58 int power = max(props->power, props->fb_blank);
59 int brightness = props->brightness;
64 tosa_bl_set_backlight(data, brightness);
69 static int tosa_bl_get_brightness(struct backlight_device *dev)
71 struct backlight_properties *props = &dev->props;
73 return props->brightness;
76 static const struct backlight_ops bl_ops = {
77 .get_brightness = tosa_bl_get_brightness,
78 .update_status = tosa_bl_update_status,
81 static int tosa_bl_probe(struct i2c_client *client,
82 const struct i2c_device_id *id)
84 struct backlight_properties props;
85 struct tosa_bl_data *data;
88 data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
93 data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
95 ret = devm_gpio_request(&client->dev, TOSA_GPIO_BL_C20MA, "backlight");
97 dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
100 ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0);
104 i2c_set_clientdata(client, data);
107 memset(&props, 0, sizeof(struct backlight_properties));
108 props.type = BACKLIGHT_RAW;
109 props.max_brightness = 512 - 1;
110 data->bl = backlight_device_register("tosa-bl", &client->dev, data,
112 if (IS_ERR(data->bl)) {
113 ret = PTR_ERR(data->bl);
117 data->bl->props.brightness = 69;
118 data->bl->props.power = FB_BLANK_UNBLANK;
120 backlight_update_status(data->bl);
129 static int tosa_bl_remove(struct i2c_client *client)
131 struct tosa_bl_data *data = i2c_get_clientdata(client);
133 backlight_device_unregister(data->bl);
140 static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm)
142 struct tosa_bl_data *data = i2c_get_clientdata(client);
144 tosa_bl_set_backlight(data, 0);
149 static int tosa_bl_resume(struct i2c_client *client)
151 struct tosa_bl_data *data = i2c_get_clientdata(client);
153 backlight_update_status(data->bl);
157 #define tosa_bl_suspend NULL
158 #define tosa_bl_resume NULL
161 static const struct i2c_device_id tosa_bl_id[] = {
167 static struct i2c_driver tosa_bl_driver = {
170 .owner = THIS_MODULE,
172 .probe = tosa_bl_probe,
173 .remove = tosa_bl_remove,
174 .suspend = tosa_bl_suspend,
175 .resume = tosa_bl_resume,
176 .id_table = tosa_bl_id,
179 module_i2c_driver(tosa_bl_driver);
181 MODULE_AUTHOR("Dmitry Baryshkov");
182 MODULE_LICENSE("GPL v2");
183 MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");