tree 9a26d57b3a02cda5783785e7c8c80b872b7c0353
parent f2cf8e25ba4cf4e0881e612125858b4eed563ee4
author Pavel Machek <[EMAIL PROTECTED]> Wed, 07 Sep 2005 05:16:45 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Thu, 08 Sep 2005 06:57:20 -0700

[PATCH] Support powering sharp zaurus sl-5500 LCD up and down

This adds support for powering Zaurus's video up and down.  PDA without
screen is kind of useless, so it is quite important...  I'll have to figure
out how to really control the frontlight, because LCD without that is quite
hard to read.

Signed-off-by: Pavel Machek <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>

 drivers/video/backlight/Makefile    |    1 
 drivers/video/backlight/locomolcd.c |  157 ++++++++++++++++++++++++++++++++++++
 2 files changed, 158 insertions(+)

diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -3,3 +3,4 @@
 obj-$(CONFIG_LCD_CLASS_DEVICE)     += lcd.o
 obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
 obj-$(CONFIG_BACKLIGHT_CORGI)  += corgi_bl.o
+obj-$(CONFIG_SHARP_LOCOMO)     += locomolcd.o
diff --git a/drivers/video/backlight/locomolcd.c 
b/drivers/video/backlight/locomolcd.c
new file mode 100644
--- /dev/null
+++ b/drivers/video/backlight/locomolcd.c
@@ -0,0 +1,157 @@
+/*
+ * Backlight control code for Sharp Zaurus SL-5500
+ *
+ * Copyright 2005 John Lenz <[EMAIL PROTECTED]>
+ * Maintainer: Pavel Machek <[EMAIL PROTECTED]> (unless John wants to :-)
+ * GPL v2
+ *
+ * This driver assumes single CPU. That's okay, because collie is
+ * slightly old hardware, and noone is going to retrofit second CPU to
+ * old PDA.
+ */
+
+/* LCD power functions */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+
+#include <asm/hardware/locomo.h>
+#include <asm/irq.h>
+
+#ifdef CONFIG_SA1100_COLLIE
+#include <asm/arch/collie.h>
+#else
+#include <asm/arch/poodle.h>
+#endif
+
+extern void (*sa1100fb_lcd_power)(int on);
+
+static struct locomo_dev *locomolcd_dev;
+
+static void locomolcd_on(int comadj)
+{
+       locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 0);
+       locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 1);
+       mdelay(2);
+
+       locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0);
+       locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 1);
+       mdelay(2);
+
+       locomo_m62332_senddata(locomolcd_dev, comadj, 0);
+       mdelay(5);
+
+       locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 0);
+       locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 1);
+       mdelay(10);
+
+       /* TFTCRST | CPSOUT=0 | CPSEN */
+       locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
+
+       /* Set CPSD */
+       locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
+
+       /* TFTCRST | CPSOUT=0 | CPSEN */
+       locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
+       mdelay(10);
+
+       locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 0);
+       locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 1);
+}
+
+static void locomolcd_off(int comadj)
+{
+       /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
+       locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
+       mdelay(1);
+
+       locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 0);
+       mdelay(110);
+
+       locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 0);
+       mdelay(700);
+
+       /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
+       locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
+       locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 0);
+       locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0);
+}
+
+void locomolcd_power(int on)
+{
+       int comadj = 118;
+       unsigned long flags;
+
+       local_irq_save(flags);
+
+       if (!locomolcd_dev) {
+               local_irq_restore(flags);
+               return;
+       }
+
+       /* read comadj */
+#ifdef CONFIG_MACH_POODLE
+       comadj = 118;
+#else
+       comadj = 128;
+#endif
+
+       if (on)
+               locomolcd_on(comadj);
+       else
+               locomolcd_off(comadj);
+
+       local_irq_restore(flags);
+}
+EXPORT_SYMBOL(locomolcd_power);
+
+static int poodle_lcd_probe(struct locomo_dev *dev)
+{
+       unsigned long flags;
+
+       local_irq_save(flags);
+       locomolcd_dev = dev;
+
+       /* the poodle_lcd_power function is called for the first time
+        * from fs_initcall, which is before locomo is activated.
+        * We need to recall poodle_lcd_power here*/
+#ifdef CONFIG_MACH_POODLE
+       locomolcd_power(1);
+#endif
+       local_irq_restore(flags);
+       return 0;
+}
+
+static int poodle_lcd_remove(struct locomo_dev *dev)
+{
+       unsigned long flags;
+       local_irq_save(flags);
+       locomolcd_dev = NULL;
+       local_irq_restore(flags);
+       return 0;
+}
+
+static struct locomo_driver poodle_lcd_driver = {
+       .drv = {
+               .name = "locomo-backlight",
+       },
+       .devid  = LOCOMO_DEVID_BACKLIGHT,
+       .probe  = poodle_lcd_probe,
+       .remove = poodle_lcd_remove,
+};
+
+static int __init poodle_lcd_init(void)
+{
+       int ret = locomo_driver_register(&poodle_lcd_driver);
+       if (ret) return ret;
+
+#ifdef CONFIG_SA1100_COLLIE
+       sa1100fb_lcd_power = locomolcd_power;
+#endif
+       return 0;
+}
+device_initcall(poodle_lcd_init);
+
-
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