Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / video / backlight / tosa_bl.c

diff --git a/kernel/drivers/video/backlight/tosa_bl.c b/kernel/drivers/video/backlight/tosa_bl.c
new file mode 100644 (file)
index 0000000..3ad6765
--- /dev/null
+++ b/kernel/drivers/video/backlight/tosa_bl.c
@@ -0,0 +1,178 @@
+/*
+ *  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 = dev_get_platdata(&data->i2c->dev);
+
+       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 = bl_get_data(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 tosa_bl_probe(struct i2c_client *client,
+               const struct i2c_device_id *id)
+{
+       struct backlight_properties props;
+       struct tosa_bl_data *data;
+       int ret = 0;
+
+       data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
+                               GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
+
+       ret = devm_gpio_request_one(&client->dev, TOSA_GPIO_BL_C20MA,
+                               GPIOF_OUT_INIT_LOW, "backlight");
+       if (ret) {
+               dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
+               return ret;
+       }
+
+       i2c_set_clientdata(client, data);
+       data->i2c = client;
+
+       memset(&props, 0, sizeof(struct backlight_properties));
+       props.type = BACKLIGHT_RAW;
+       props.max_brightness = 512 - 1;
+       data->bl = devm_backlight_device_register(&client->dev, "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;
+       return ret;
+}
+
+static int tosa_bl_remove(struct i2c_client *client)
+{
+       struct tosa_bl_data *data = i2c_get_clientdata(client);
+
+       data->bl = NULL;
+       return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tosa_bl_suspend(struct device *dev)
+{
+       struct tosa_bl_data *data = dev_get_drvdata(dev);
+
+       tosa_bl_set_backlight(data, 0);
+
+       return 0;
+}
+
+static int tosa_bl_resume(struct device *dev)
+{
+       struct tosa_bl_data *data = dev_get_drvdata(dev);
+
+       backlight_update_status(data->bl);
+       return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume);
+
+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,
+               .pm             = &tosa_bl_pm_ops,
+       },
+       .probe          = tosa_bl_probe,
+       .remove         = tosa_bl_remove,
+       .id_table       = tosa_bl_id,
+};
+
+module_i2c_driver(tosa_bl_driver);
+
+MODULE_AUTHOR("Dmitry Baryshkov");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
+