--- /dev/null
+/*
+ * Backlight control code for Sharp Zaurus SL-5500
+ *
+ * Copyright 2005 John Lenz <lenz@cs.wisc.edu>
+ * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
+ * GPL v2
+ *
+ * This driver assumes single CPU. That's okay, because collie is
+ * slightly old hardware, and no one is going to retrofit second CPU to
+ * old PDA.
+ */
+
+/* LCD power functions */
+#include <linux/module.h>
+#include <linux/init.h>
+#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>
+#include <asm/mach/sharpsl_param.h>
+#include <asm/mach-types.h>
+
+#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)
+{
+ locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
+ locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1);
+ mdelay(2);
+
+ locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
+ locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1);
+ mdelay(2);
+
+ locomo_m62332_senddata(locomolcd_dev, comadj, 0);
+ mdelay(5);
+
+ locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
+ locomo_gpio_write(locomolcd_dev->dev.parent, 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->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
+ locomo_gpio_write(locomolcd_dev->dev.parent, 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->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
+ mdelay(110);
+
+ locomo_gpio_write(locomolcd_dev->dev.parent, 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->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
+ locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
+}
+
+void locomolcd_power(int on)
+{
+ int comadj = sharpsl_param.comadj;
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ if (!locomolcd_dev) {
+ local_irq_restore(flags);
+ return;
+ }
+
+ /* read comadj */
+ if (comadj == -1 && machine_is_collie())
+ comadj = 128;
+ if (comadj == -1 && machine_is_poodle())
+ comadj = 118;
+
+ if (on)
+ locomolcd_on(comadj);
+ else
+ locomolcd_off(comadj);
+
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(locomolcd_power);
+
+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 const struct backlight_ops locomobl_data = {
+ .get_brightness = locomolcd_get_intensity,
+ .update_status = locomolcd_set_intensity,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int locomolcd_suspend(struct device *dev)
+{
+ locomolcd_flags |= LOCOMOLCD_SUSPENDED;
+ locomolcd_set_intensity(locomolcd_bl_device);
+ return 0;
+}
+
+static int locomolcd_resume(struct device *dev)
+{
+ locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
+ locomolcd_set_intensity(locomolcd_bl_device);
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
+
+static int locomolcd_probe(struct locomo_dev *ldev)
+{
+ struct backlight_properties props;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ locomolcd_dev = ldev;
+
+ locomo_gpio_set_dir(ldev->dev.parent, 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
+ */
+ if (machine_is_poodle())
+ locomolcd_power(1);
+
+ local_irq_restore(flags);
+
+ memset(&props, 0, sizeof(struct backlight_properties));
+ props.type = BACKLIGHT_RAW;
+ props.max_brightness = 4;
+ locomolcd_bl_device = backlight_device_register("locomo-bl",
+ &ldev->dev, NULL,
+ &locomobl_data, &props);
+
+ if (IS_ERR(locomolcd_bl_device))
+ return PTR_ERR(locomolcd_bl_device);
+
+ /* Set up frontlight so that screen is readable */
+ locomolcd_bl_device->props.brightness = 2;
+ locomolcd_set_intensity(locomolcd_bl_device);
+
+ return 0;
+}
+
+static int locomolcd_remove(struct locomo_dev *dev)
+{
+ unsigned long flags;
+
+ locomolcd_bl_device->props.brightness = 0;
+ locomolcd_bl_device->props.power = 0;
+ locomolcd_set_intensity(locomolcd_bl_device);
+
+ backlight_device_unregister(locomolcd_bl_device);
+ local_irq_save(flags);
+ locomolcd_dev = NULL;
+ local_irq_restore(flags);
+ return 0;
+}
+
+static struct locomo_driver poodle_lcd_driver = {
+ .drv = {
+ .name = "locomo-backlight",
+ .pm = &locomolcd_pm_ops,
+ },
+ .devid = LOCOMO_DEVID_BACKLIGHT,
+ .probe = locomolcd_probe,
+ .remove = locomolcd_remove,
+};
+
+static int __init locomolcd_init(void)
+{
+ return locomo_driver_register(&poodle_lcd_driver);
+}
+
+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@ucw.cz>");
+MODULE_DESCRIPTION("Collie LCD driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff