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_lcd.c b/drivers/video/backlight/tosa_lcd.c
new file mode 100644
index 0000000..57a2664
--- /dev/null
+++ b/drivers/video/backlight/tosa_lcd.c
@@ -0,0 +1,280 @@
+/*
+ * 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/delay.h>
+#include <linux/lcd.h>
+#include <linux/fb.h>
+
+#include <asm/mach/sharpsl_param.h>
+
+#include <mach/tosa.h>
+
+#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
+
+#define TG_REG0_VQV 0x0001
+#define TG_REG0_COLOR 0x0002
+#define TG_REG0_UD 0x0004
+#define TG_REG0_LR 0x0008
+
+#define DAC_BASE 0x4e
+
+struct tosa_lcd_data {
+ struct spi_device *spi;
+ struct lcd_device *lcd;
+ struct i2c_client *i2c;
+
+ int lcd_power;
+};
+
+static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
+{
+ u8 buf[1];
+ struct spi_message msg;
+ struct spi_transfer xfer = {
+ .len = 1,
+ .cs_change = 1,
+ .tx_buf = buf,
+ };
+
+ buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ return spi_sync(spi, &msg);
+}
+
+int tosa_bl_enable(struct spi_device *spi, int enable)
+{
+ /* bl_enable GP04=1 otherwise GP04=0*/
+ return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00);
+}
+EXPORT_SYMBOL(tosa_bl_enable);
+
+static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
+{
+ /* TG on */
+ gpio_set_value(TOSA_GPIO_TG_ON, 0);
+
+ mdelay(60);
+
+ /* delayed 0clk TCTL signal for VGA */
+ tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
+ /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
+ tosa_tg_send(data->spi, TG_GPOSR, 0x02);
+}
+
+static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
+{
+ struct spi_device *spi = data->spi;
+ const int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
+ tosa_tg_send(spi, TG_PNLCTL, value | TG_REG0_VQV); /* this depends on mode */
+
+ /* TG LCD pannel power up */
+ tosa_tg_send(spi, TG_PINICTL,0x4);
+ mdelay(50);
+
+ /* TG LCD GVSS */
+ tosa_tg_send(spi, TG_PINICTL,0x0);
+
+ if (!data->i2c) {
+ /* after the pannel is powered up the first time, we can access the i2c bus */
+ /* so probe for the DAC */
+ struct i2c_adapter *adap = i2c_get_adapter(0);
+ struct i2c_board_info info = {
+ .type = "tosa-bl",
+ .addr = DAC_BASE,
+ .platform_data = data->spi,
+ };
+ data->i2c = i2c_new_device(adap, &info);
+ }
+}
+
+static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
+{
+ struct spi_device *spi = data->spi;
+
+ /* TG LCD VHSA off */
+ tosa_tg_send(spi, TG_PINICTL,0x4);
+ mdelay(50);
+
+ /* TG LCD signal off */
+ tosa_tg_send(spi, TG_PINICTL,0x6);
+ mdelay(50);
+
+ /* TG Off */
+ gpio_set_value(TOSA_GPIO_TG_ON, 1);
+ mdelay(100);
+}
+
+int tosa_lcd_set_power(struct lcd_device *lcd, int power)
+{
+ struct tosa_lcd_data *data = lcd_get_data(lcd);
+
+ if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
+ tosa_lcd_tg_on(data);
+
+ if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
+ tosa_lcd_tg_off(data);
+
+ data->lcd_power = power;
+ return 0;
+}
+
+static int tosa_lcd_get_power(struct lcd_device *lcd)
+{
+ struct tosa_lcd_data *data = lcd_get_data(lcd);
+
+ return data->lcd_power;
+}
+
+static struct lcd_ops tosa_lcd_ops = {
+ .set_power = tosa_lcd_set_power,
+ .get_power = tosa_lcd_get_power,
+};
+
+static int __devinit tosa_lcd_probe(struct spi_device *spi)
+{
+ int ret;
+ struct tosa_lcd_data *data;
+
+ data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /*
+ * bits_per_word cannot be configured in platform data
+ */
+ spi->bits_per_word = 8;
+
+ ret = spi_setup(spi);
+ if (ret < 0)
+ goto err_spi;
+
+ data->spi = spi;
+ dev_set_drvdata(&spi->dev, data);
+
+ ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr");
+ if (ret < 0)
+ goto err_gpio_tg;
+
+ mdelay(60);
+
+ ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
+ if (ret < 0)
+ goto err_gpio_dir;
+
+ mdelay(60);
+ tosa_lcd_tg_init(data);
+
+ tosa_lcd_tg_on(data);
+
+ data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
+ &tosa_lcd_ops);
+
+ if (IS_ERR(data->lcd)) {
+ ret = PTR_ERR(data->lcd);
+ data->lcd = NULL;
+ goto err_register;
+ }
+
+ return 0;
+
+err_register:
+ tosa_lcd_tg_off(data);
+err_gpio_dir:
+ gpio_free(TOSA_GPIO_TG_ON);
+err_gpio_tg:
+ dev_set_drvdata(&spi->dev, NULL);
+err_spi:
+ kfree(data);
+ return ret;
+}
+
+static int __devexit tosa_lcd_remove(struct spi_device *spi)
+{
+ struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
+
+ lcd_device_unregister(data->lcd);
+
+ if (data->i2c)
+ i2c_unregister_device(data->i2c);
+
+ tosa_lcd_tg_off(data);
+
+ gpio_free(TOSA_GPIO_TG_ON);
+ dev_set_drvdata(&spi->dev, NULL);
+ kfree(data);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
+{
+ struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
+
+ tosa_lcd_tg_off(data);
+
+ return 0;
+}
+
+static int tosa_lcd_resume(struct spi_device *spi)
+{
+ struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
+
+ tosa_lcd_tg_init(data);
+ if (POWER_IS_ON(data->lcd_power))
+ tosa_lcd_tg_on(data);
+ else
+ tosa_lcd_tg_off(data);
+
+ return 0;
+}
+#else
+#define tosa_lcd_suspend NULL
+#define tosa_lcd_reume NULL
+#endif
+
+static struct spi_driver tosa_lcd_driver = {
+ .driver = {
+ .name = "tosa-lcd",
+ .owner = THIS_MODULE,
+ },
+ .probe = tosa_lcd_probe,
+ .remove = __devexit_p(tosa_lcd_remove),
+ .suspend = tosa_lcd_suspend,
+ .resume = tosa_lcd_resume,
+};
+
+static int __init tosa_lcd_init(void)
+{
+ return spi_register_driver(&tosa_lcd_driver);
+}
+
+static void __exit tosa_lcd_exit(void)
+{
+ spi_unregister_driver(&tosa_lcd_driver);
+}
+
+module_init(tosa_lcd_init);
+module_exit(tosa_lcd_exit);
+
+MODULE_AUTHOR("Dmitry Baryshkov");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
+