backlight: add support for Sharp SL-6000 LCD and backlight drivers
On Sharp SL-6000 lcd/backlight is a bit complex, so add two drivers
one for lcd-driving chip, other one for dac regulating the backlight
LEDS.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
diff --git a/drivers/video/backlight/tosa_bl.c b/drivers/video/backlight/tosa_bl.c
new file mode 100644
index 0000000..43edbad
--- /dev/null
+++ b/drivers/video/backlight/tosa_bl.c
@@ -0,0 +1,198 @@
+/*
+ * 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 <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 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 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;
+
+ data->bl = backlight_device_register("tosa-bl", &client->dev,
+ data, &bl_ops);
+ if (IS_ERR(data->bl)) {
+ ret = PTR_ERR(data->bl);
+ goto err_reg;
+ }
+
+ data->bl->props.brightness = 69;
+ data->bl->props.max_brightness = 512 - 1;
+ 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");
+