[PATCH] backlight: LOCOMO Backlight Driver updates

Add backlight intensity control to the LOCOMO lcd/backlight driver using the
backlight class and add basic power management support.

This is a reimplementation and improvement of patches by John Lenz and Pavel
Machek

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
index a7dc137..0dafba3 100644 (file)
--- a/arch/arm/common/locomo.c
+++ b/arch/arm/common/locomo.c
@@ -629,21 +629,6 @@ static int locomo_resume(struct platform_device *dev)
 #endif
 
 
-#define LCM_ALC_EN     0x8000
-
-void frontlight_set(struct locomo *lchip, int duty, int vr, int bpwf)
-{
-       unsigned long flags;
-
-       spin_lock_irqsave(&lchip->lock, flags);
-       locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
-       udelay(100);
-       locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
-       locomo_writel(bpwf | LCM_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
-       spin_unlock_irqrestore(&lchip->lock, flags);
-}
-
-
 /**
  *     locomo_probe - probe for a single LoCoMo chip.
  *     @phys_addr: physical address of device.
@@ -698,14 +683,10 @@ __locomo_probe(struct device *me, struct resource *mem, int irq)
                        , lchip->base + LOCOMO_GPD);
        locomo_writel(0, lchip->base + LOCOMO_GIE);
 
-       /* FrontLight */
+       /* Frontlight */
        locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
        locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
 
-       /* Same constants can be used for collie and poodle
-          (depending on CONFIG options in original sharp code)? */
-       frontlight_set(lchip, 163, 0, 148);
-
        /* Longtime timer */
        locomo_writel(0, lchip->base + LOCOMO_LTINT);
        /* SPI */
@@ -1062,6 +1043,30 @@ void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int
        spin_unlock_irqrestore(&lchip->lock, flags);
 }
 
+/*
+ *     Frontlight control
+ */
+
+static struct locomo *locomo_chip_driver(struct locomo_dev *ldev);
+
+void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
+{
+       unsigned long flags;
+       struct locomo *lchip = locomo_chip_driver(dev);
+
+       if (vr)
+               locomo_gpio_write(dev, LOCOMO_GPIO_FL_VR, 1);
+       else
+               locomo_gpio_write(dev, LOCOMO_GPIO_FL_VR, 0);
+
+       spin_lock_irqsave(&lchip->lock, flags);
+       locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+       udelay(100);
+       locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
+       locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+       spin_unlock_irqrestore(&lchip->lock, flags);
+}
+
 /*
  *     LoCoMo "Register Access Bus."
  *

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index b895eaa..02f1529 100644 (file)
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -50,6 +50,14 @@ config BACKLIGHT_CORGI
          If you have a Sharp Zaurus SL-C7xx, SL-Cxx00 or SL-6000x say y to enable the
          backlight driver.
 
+config BACKLIGHT_LOCOMO
+       tristate "Sharp LOCOMO LCD/Backlight Driver"
+       depends on BACKLIGHT_DEVICE && SHARP_LOCOMO
+       default y
+       help
+         If you have a Sharp Zaurus SL-5500 (Collie) or SL-5600 (Poodle) say y to
+         enable the LCD/backlight driver.
+
 config BACKLIGHT_HP680
        tristate "HP Jornada 680 Backlight Driver"
        depends on BACKLIGHT_DEVICE && SH_HP6XX

diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 744210c..65e5553 100644 (file)
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -4,4 +4,4 @@ obj-$(CONFIG_LCD_CLASS_DEVICE)     += lcd.o
 obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
 obj-$(CONFIG_BACKLIGHT_CORGI)  += corgi_bl.o
 obj-$(CONFIG_BACKLIGHT_HP680)  += hp680_bl.o
-obj-$(CONFIG_SHARP_LOCOMO)     += locomolcd.o
+obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o

diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
index 60831bb..bd879b7 100644 (file)
--- a/drivers/video/backlight/locomolcd.c
+++ b/drivers/video/backlight/locomolcd.c
@@ -17,6 +17,8 @@
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
 
 #include <asm/hardware/locomo.h>
 #include <asm/irq.h>
@@ -25,7 +27,10 @@
 
 #include "../../../arch/arm/mach-sa1100/generic.h"
 
+static struct backlight_device *locomolcd_bl_device;
 static struct locomo_dev *locomolcd_dev;
+static unsigned long locomolcd_flags;
+#define LOCOMOLCD_SUSPENDED     0x01
 
 static void locomolcd_on(int comadj)
 {
@@ -89,12 +94,10 @@ void locomolcd_power(int on)
        }
 
        /* read comadj */
-       if (comadj == -1) {
-               if (machine_is_poodle())
-                       comadj = 118;
-               if (machine_is_collie())
-                       comadj = 128;
-       }
+       if (comadj == -1 && machine_is_collie())
+               comadj = 128;
+       if (comadj == -1 && machine_is_poodle())
+               comadj = 118;
 
        if (on)
                locomolcd_on(comadj);
@@ -105,26 +108,100 @@ void locomolcd_power(int on)
 }
 EXPORT_SYMBOL(locomolcd_power);
 
-static int poodle_lcd_probe(struct locomo_dev *dev)
+
+static int current_intensity;
+
+static int locomolcd_set_intensity(struct backlight_device *bd)
+{
+       int intensity = bd->props->brightness;
+
+       if (bd->props->power != FB_BLANK_UNBLANK)
+               intensity = 0;
+       if (bd->props->fb_blank != FB_BLANK_UNBLANK)
+               intensity = 0;
+       if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
+               intensity = 0;
+
+       switch (intensity) {
+       /* AC and non-AC are handled differently, but produce same results in sharp code? */
+       case 0: locomo_frontlight_set(locomolcd_dev, 0, 0, 161); break;
+       case 1: locomo_frontlight_set(locomolcd_dev, 117, 0, 161); break;
+       case 2: locomo_frontlight_set(locomolcd_dev, 163, 0, 148); break;
+       case 3: locomo_frontlight_set(locomolcd_dev, 194, 0, 161); break;
+       case 4: locomo_frontlight_set(locomolcd_dev, 194, 1, 161); break;
+
+       default:
+               return -ENODEV;
+       }
+       current_intensity = intensity;
+       return 0;
+}
+
+static int locomolcd_get_intensity(struct backlight_device *bd)
+{
+       return current_intensity;
+}
+
+static struct backlight_properties locomobl_data = {
+       .owner          = THIS_MODULE,
+       .get_brightness = locomolcd_get_intensity,
+       .update_status  = locomolcd_set_intensity,
+       .max_brightness = 4,
+};
+
+#ifdef CONFIG_PM
+static int locomolcd_suspend(struct locomo_dev *dev, pm_message_t state)
+{
+       locomolcd_flags |= LOCOMOLCD_SUSPENDED;
+       locomolcd_set_intensity(locomolcd_bl_device);
+       return 0;
+}
+
+static int locomolcd_resume(struct locomo_dev *dev)
+{
+       locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
+       locomolcd_set_intensity(locomolcd_bl_device);
+       return 0;
+}
+#else
+#define locomolcd_suspend      NULL
+#define locomolcd_resume       NULL
+#endif
+
+static int locomolcd_probe(struct locomo_dev *dev)
 {
        unsigned long flags;
 
        local_irq_save(flags);
        locomolcd_dev = dev;
 
+       locomo_gpio_set_dir(dev, LOCOMO_GPIO_FL_VR, 0);
+
        /* 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
+       if (machine_is_poodle())
+               locomolcd_power(1);
+
        local_irq_restore(flags);
+
+       locomolcd_bl_device = backlight_device_register("locomo-bl", NULL, &locomobl_data);
+
+       if (IS_ERR (locomolcd_bl_device))
+               return PTR_ERR (locomolcd_bl_device);
+
+       /* Set up frontlight so that screen is readable */
+       locomobl_data.brightness = 2;
+       locomolcd_set_intensity(locomolcd_bl_device);
+
        return 0;
 }
 
-static int poodle_lcd_remove(struct locomo_dev *dev)
+static int locomolcd_remove(struct locomo_dev *dev)
 {
        unsigned long flags;
+
+       backlight_device_unregister(locomolcd_bl_device);
        local_irq_save(flags);
        locomolcd_dev = NULL;
        local_irq_restore(flags);
@@ -136,19 +213,33 @@ static struct locomo_driver poodle_lcd_driver = {
                .name = "locomo-backlight",
        },
        .devid  = LOCOMO_DEVID_BACKLIGHT,
-       .probe  = poodle_lcd_probe,
-       .remove = poodle_lcd_remove,
+       .probe  = locomolcd_probe,
+       .remove = locomolcd_remove,
+       .suspend = locomolcd_suspend,
+       .resume = locomolcd_resume,
 };
 
-static int __init poodle_lcd_init(void)
+
+static int __init locomolcd_init(void)
 {
        int ret = locomo_driver_register(&poodle_lcd_driver);
-       if (ret) return ret;
+       if (ret)
+               return ret;
 
 #ifdef CONFIG_SA1100_COLLIE
        sa1100fb_lcd_power = locomolcd_power;
 #endif
        return 0;
 }
-device_initcall(poodle_lcd_init);
 
+static void __exit locomolcd_exit(void)
+{
+       locomo_driver_unregister(&poodle_lcd_driver);
+}
+
+module_init(locomolcd_init);
+module_exit(locomolcd_exit);
+
+MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@suse.cz>");
+MODULE_DESCRIPTION("Collie LCD driver");
+MODULE_LICENSE("GPL");

diff --git a/include/asm-arm/hardware/locomo.h b/include/asm-arm/hardware/locomo.h
index 5f10048..22dfb17 100644 (file)
--- a/include/asm-arm/hardware/locomo.h
+++ b/include/asm-arm/hardware/locomo.h
@@ -111,6 +111,8 @@
 #define LOCOMO_ALS             0x00    /* Adjust light cycle */
 #define LOCOMO_ALD             0x04    /* Adjust light duty */
 
+#define LOCOMO_ALC_EN          0x8000
+
 /* Backlight controller: TFT signal */
 #define LOCOMO_BACKLIGHT       0x38
 #define LOCOMO_TC              0x00            /* TFT control signal */
@@ -203,4 +205,7 @@ void locomo_gpio_write(struct locomo_dev *ldev, unsigned int bits, unsigned int
 /* M62332 control function */
 void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel);
 
+/* Frontlight control */
+void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf);
+
 #endif