path: root/recipes/linux/linux-rp-2.6.24/tosa/0052-tosa-platform-backlight-support.patch

From c7537657bc33d4ee1616accd0259e160d57c5c1b Mon Sep 17 00:00:00 2001
From: Ian Molton <spyro@f2s.com>
Date: Wed, 9 Jan 2008 02:05:40 +0300
Subject: [PATCH 52/64] tosa platform backlight support

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
---
 drivers/video/backlight/Kconfig   |   10 +
 drivers/video/backlight/Makefile  |    1 +
 drivers/video/backlight/tosa_bl.c |  345 +++++++++++++++++++++++++++++++++++++
 3 files changed, 356 insertions(+), 0 deletions(-)
 create mode 100644 drivers/video/backlight/tosa_bl.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 9609a6c..f47a601 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -59,6 +59,16 @@ config BACKLIGHT_CORGI
 	  known as the Corgi backlight driver. If you have a Sharp Zaurus
 	  SL-C7xx, SL-Cxx00 or SL-6000x say y. Most users can say n.
 
+config BACKLIGHT_TOSA
+	tristate "Sharp Tosa LCD/Backlight Driver (SL-6000)"
+	depends on BACKLIGHT_CLASS_DEVICE && MACH_TOSA
+	default y
+	select I2C
+	select I2C_PXA
+	select PXA_SSP
+	help
+	  If you have a Sharp Zaurus SL-6000y enable this driver.
+
 config BACKLIGHT_LOCOMO
 	tristate "Sharp LOCOMO LCD/Backlight Driver"
 	depends on BACKLIGHT_CLASS_DEVICE && SHARP_LOCOMO
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 965a78b..e8a6a7c 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_LCD_LTV350QV)	+= ltv350qv.o
 
 obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
 obj-$(CONFIG_BACKLIGHT_CORGI)	+= corgi_bl.o
+obj-$(CONFIG_BACKLIGHT_TOSA)	+= tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_HP680)	+= hp680_bl.o
 obj-$(CONFIG_BACKLIGHT_LOCOMO)	+= locomolcd.o
 obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
diff --git a/drivers/video/backlight/tosa_bl.c b/drivers/video/backlight/tosa_bl.c
new file mode 100644
index 0000000..11a89c6
--- /dev/null
+++ b/drivers/video/backlight/tosa_bl.c
@@ -0,0 +1,345 @@
+/*
+ *  LCD / Backlight control code for Sharp SL-6000x (tosa)
+ *
+ *  Copyright (c) 2005		Dirk Opfer
+ *  Copyright (c) 2007		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/i2c.h>
+#include <linux/backlight.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/mfd/tc6393xb.h>
+
+#include <asm/hardware/scoop.h>
+#include <asm/mach/sharpsl_param.h>
+#include <asm/arch/ssp.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/tosa.h>
+#include <asm/gpio.h>
+
+#define	DAC_BASE	0x4e
+#define DAC_CH1		0
+#define DAC_CH2		1
+
+#define TG_REG0_VQV	0x0001
+#define TG_REG0_COLOR	0x0002
+#define TG_REG0_UD	0x0004
+#define TG_REG0_LR	0x0008
+#define COMADJ_DEFAULT 	97
+
+static unsigned short normal_i2c[] = { DAC_BASE, I2C_CLIENT_END };
+I2C_CLIENT_INSMOD;
+
+struct tosa_bl_data {
+	struct i2c_client	client;
+
+	int			comadj;
+	spinlock_t		nssp_lock;
+	struct ssp_dev		nssp_dev;
+	struct ssp_state	nssp_state;
+
+	struct backlight_device	*bl_dev;
+};
+
+static struct i2c_driver tosa_bl_driver;
+
+static void pxa_nssp_output(struct tosa_bl_data *data, unsigned char reg, unsigned char value)
+{
+	unsigned long flag;
+	u32 dummy;
+	u32 dat = ( ((reg << 5) & 0xe0) | (value & 0x1f) );
+	spin_lock_irqsave(&data->nssp_lock, flag);
+
+	ssp_config(&data->nssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), 0, 0, SSCR0_SerClkDiv(128));
+	ssp_enable(&data->nssp_dev);
+
+	ssp_write_word(&data->nssp_dev,dat);
+
+	/* Read null data back from device to prevent SSP overflow */
+	ssp_read_word(&data->nssp_dev, &dummy);
+	ssp_disable(&data->nssp_dev);
+	spin_unlock_irqrestore(&data->nssp_lock, flag);
+
+}
+
+static void tosa_set_backlight(struct tosa_bl_data *data, int brightness)
+{
+	/* SetBacklightDuty */
+	i2c_smbus_write_byte_data(&data->client, DAC_CH2, (unsigned char)brightness);
+
+	/* SetBacklightVR */
+	if (brightness)
+		gpio_set_value(TOSA_TC6393XB_BL_C20MA, 1);
+	else
+		gpio_set_value(TOSA_TC6393XB_BL_C20MA, 0);
+
+	/* bl_enable GP04=1 otherwise GP04=0*/
+	pxa_nssp_output(data, TG_GPODR2, brightness ? 0x01 : 0x00);
+}
+
+static void tosa_lcd_tg_init(struct tosa_bl_data *data)
+{
+	dev_dbg(&data->bl_dev->dev, "tosa_lcd_init\n");
+
+	/* L3V On */
+	set_scoop_gpio( &tosascoop_jc_device.dev,TOSA_SCOOP_JC_TC6393XB_L3V_ON);
+	mdelay(60);
+
+	/* TG On */
+	gpio_set_value(TOSA_TC6393XB_TG_ON, 0);
+	mdelay(60);
+
+	pxa_nssp_output(data, TG_TPOSCTL,0x00);	/* delayed 0clk TCTL signal for VGA */
+	pxa_nssp_output(data, TG_GPOSR,0x02);		/* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
+}
+
+static void tosa_lcd_tg_on(struct tosa_bl_data *data/*, const struct fb_videomode *mode*/)
+{
+	const int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
+
+	tosa_lcd_tg_init(data);
+
+	dev_dbg(&data->bl_dev->dev, "tosa_lcd_on\n");
+	pxa_nssp_output(data, TG_PNLCTL, value | (/*mode->yres == 320 ? 0 : */ TG_REG0_VQV));
+
+	/* TG LCD pannel power up */
+	pxa_nssp_output(data, TG_PINICTL,0x4);
+	mdelay(50);
+
+	/* TG LCD GVSS */
+	pxa_nssp_output(data, TG_PINICTL,0x0);
+	mdelay(50);
+
+	/* set common voltage */
+	i2c_smbus_write_byte_data(&data->client, DAC_CH1, data->comadj);
+}
+
+static void tosa_lcd_tg_off(struct tosa_bl_data *data)
+{
+	tosa_set_backlight(data, 0);
+	dev_dbg(&data->bl_dev->dev, "tosa_lcd_off\n");
+	/* TG LCD VHSA off */
+	pxa_nssp_output(data, TG_PINICTL,0x4);
+	mdelay(50);
+
+	/* TG LCD signal off */
+	pxa_nssp_output(data, TG_PINICTL,0x6);
+	mdelay(50);
+
+	/* TG Off */
+	gpio_set_value(TOSA_TC6393XB_TG_ON, 1);
+	mdelay(100);
+
+	/* L3V Off */
+	reset_scoop_gpio( &tosascoop_jc_device.dev,TOSA_SCOOP_JC_TC6393XB_L3V_ON);
+}
+
+
+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 new_power = max(props->power, props->fb_blank);
+
+	tosa_set_backlight(data, props->brightness);
+
+	if (new_power)
+		tosa_lcd_tg_off(data);
+	else
+		tosa_lcd_tg_on(data);
+
+	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 tosa_bl_ops = {
+	.get_brightness		= tosa_bl_get_brightness,
+	.update_status		= tosa_bl_update_status,
+};
+
+static int tosa_bl_detect_client(struct i2c_adapter *adapter, int address,
+                        int kind)
+{
+	int err = 0;
+	struct i2c_client *client;
+	struct tosa_bl_data *data;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA ))
+		goto out;
+
+	if (!(data = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL))) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	client = &data->client;
+	i2c_set_clientdata(client, data);
+
+	client->addr = address;
+	client->adapter = adapter;
+	client->driver = &tosa_bl_driver;
+
+	strlcpy(client->name, "tosa_bl", I2C_NAME_SIZE);
+
+	spin_lock_init(&data->nssp_lock);
+	data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
+
+	err = gpio_request(TOSA_TC6393XB_BL_C20MA, "backlight");
+	if (err) {
+		dev_dbg(&data->bl_dev->dev, "Unable to request gpio!\n");
+		goto err_gpio_bl;
+	}
+
+	err = gpio_request(TOSA_TC6393XB_TG_ON, "tg");
+	if (err) {
+		dev_dbg(&data->bl_dev->dev, "Unable to request gpio!\n");
+		goto err_gpio_tg;
+	}
+
+	err = ssp_init(&data->nssp_dev,2,0);
+	if (err) {
+		dev_err(&data->bl_dev->dev, "Unable to register NSSP handler!\n");
+		goto err_ssp_init;
+	}
+
+	/* Tell the i2c layer a new client has arrived */
+	err = i2c_attach_client(client);
+	if (err)
+		goto err_i2c_attach;
+
+	gpio_direction_output(TOSA_TC6393XB_BL_C20MA, 0);
+	gpio_direction_output(TOSA_TC6393XB_TG_ON, 1);
+
+	tosa_lcd_tg_init(data);
+
+	data->bl_dev = backlight_device_register("tosa_bl",
+			&client->dev, data, &tosa_bl_ops);
+	if (err)
+		goto err_bl_register;
+
+	data->bl_dev->props.brightness = 69;
+	data->bl_dev->props.max_brightness = 255;
+	data->bl_dev->props.power = FB_BLANK_UNBLANK;
+	backlight_update_status(data->bl_dev);
+
+
+	return 0;
+
+err_bl_register:
+	tosa_set_backlight(data, 0);
+	tosa_lcd_tg_off(data);
+
+	err = i2c_detach_client(client);
+	if (err)
+		return err;
+err_i2c_attach:
+	ssp_exit(&data->nssp_dev);
+err_ssp_init:
+	gpio_free(TOSA_TC6393XB_TG_ON);
+err_gpio_tg:
+	gpio_free(TOSA_TC6393XB_BL_C20MA);
+err_gpio_bl:
+	kfree(data);
+out:
+	return err;
+}
+
+static int tosa_bl_detach_client(struct i2c_client *client)
+{
+	int err = 0;
+	struct tosa_bl_data *data = i2c_get_clientdata(client);
+
+	backlight_device_unregister(data->bl_dev);
+
+	tosa_set_backlight(data, 0);
+	tosa_lcd_tg_off(data);
+
+	/* Try to detach the client from i2c space */
+	if ((err = i2c_detach_client(client)))
+		return err;
+
+	ssp_exit(&data->nssp_dev);
+
+	gpio_free(TOSA_TC6393XB_TG_ON);
+	gpio_free(TOSA_TC6393XB_BL_C20MA);
+
+	kfree(data);
+
+	return err;
+}
+
+#ifdef CONFIG_PM
+static int tosa_bl_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+	struct tosa_bl_data *data = i2c_get_clientdata(client);
+
+	tosa_lcd_tg_off(data);
+	ssp_flush(&data->nssp_dev);
+	ssp_save_state(&data->nssp_dev,&data->nssp_state);
+
+	return 0;
+}
+
+static int tosa_bl_resume(struct i2c_client *client)
+{
+	struct tosa_bl_data *data = i2c_get_clientdata(client);
+
+	ssp_restore_state(&data->nssp_dev,&data->nssp_state);
+	ssp_enable(&data->nssp_dev);
+	tosa_bl_update_status(data->bl_dev);
+
+	return 0;
+}
+#else
+#define tosa_bl_suspend NULL
+#define tosa_bl_resume NULL
+#endif
+
+static int tosa_bl_attach_adapter(struct i2c_adapter *adapter)
+{
+	return i2c_probe(adapter, &addr_data, &tosa_bl_detect_client);
+}
+
+static struct i2c_driver tosa_bl_driver = {
+	.driver = {
+		.name	= "tosa_bl",
+	},
+
+	.attach_adapter	= tosa_bl_attach_adapter,
+	.detach_client	= tosa_bl_detach_client,
+
+	.suspend	= tosa_bl_suspend,
+	.resume		= tosa_bl_resume,
+};
+
+static int __init tosa_bl_init(void)
+{
+	return i2c_add_driver(&tosa_bl_driver);
+}
+
+static void __exit tosa_bl_cleanup (void)
+{
+	i2c_del_driver(&tosa_bl_driver);
+}
+
+module_init(tosa_bl_init);
+module_exit(tosa_bl_cleanup);
+
+MODULE_DESCRIPTION("Tosa LCD device");
+MODULE_AUTHOR("Dirk Opfer, Dmitry Baryshkov");
+MODULE_LICENSE("GPL v2");
-- 
1.5.3.8