@@ -0,0 +1,224 @@
+/*
+ * 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/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/lcd.h>
+#include <linux/mfd/locomo.h>
+
+static struct platform_device *locomolcd_dev;
+static struct locomo_lcd_platform_data lcd_data;
+static bool locomolcd_is_on;
+static bool locomolcd_is_suspended;
+static void __iomem *locomolcd_regs;
+static struct lcd_device *lcd_dev;
+
+static struct gpio locomo_gpios[] = {
+ { 0, GPIOF_OUT_INIT_LOW, "LCD VSHA on" },
+ { 0, GPIOF_OUT_INIT_LOW, "LCD VSHD on" },
+ { 0, GPIOF_OUT_INIT_LOW, "LCD Vee on" },
+ { 0, GPIOF_OUT_INIT_LOW, "LCD MOD" },
+};
+
+static void locomolcd_on(void)
+{
+ gpio_set_value(lcd_data.gpio_lcd_vsha_on, 1);
+ mdelay(2);
+
+ gpio_set_value(lcd_data.gpio_lcd_vshd_on, 1);
+ mdelay(2);
+
+ locomo_m62332_senddata(locomolcd_dev->dev.parent, lcd_data.comadj, 0);
+ mdelay(5);
+
+ gpio_set_value(lcd_data.gpio_lcd_vee_on, 1);
+ mdelay(10);
+
+ /* TFTCRST | CPSOUT=0 | CPSEN */
+ writew(0x01, locomolcd_regs + LOCOMO_TC);
+
+ /* Set CPSD */
+ writew(6, locomolcd_regs + LOCOMO_CPSD);
+
+ /* TFTCRST | CPSOUT=0 | CPSEN */
+ writew((0x04 | 0x01), locomolcd_regs + LOCOMO_TC);
+ mdelay(10);
+
+ gpio_set_value(lcd_data.gpio_lcd_mod, 1);
+}
+
+static void locomolcd_off(void)
+{
+ /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
+ writew(0x06, locomolcd_regs + LOCOMO_TC);
+ mdelay(1);
+
+ gpio_set_value(lcd_data.gpio_lcd_vsha_on, 0);
+ mdelay(110);
+
+ gpio_set_value(lcd_data.gpio_lcd_vee_on, 0);
+ mdelay(700);
+
+ locomo_m62332_senddata(locomolcd_dev->dev.parent, 0, 0);
+ mdelay(5);
+
+ /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
+ writew(0, locomolcd_regs + LOCOMO_TC);
+ gpio_set_value(lcd_data.gpio_lcd_mod, 0);
+ gpio_set_value(lcd_data.gpio_lcd_vshd_on, 0);
+}
+
+int locomo_lcd_set_power(struct lcd_device *lcd, int power)
+{
+ dev_dbg(&lcd->dev, "LCD power %d (is %d)\n", power, locomolcd_is_on);
+ if (power == 0 && !locomolcd_is_on) {
+ locomolcd_is_on = 1;
+ locomolcd_on();
+ }
+ if (power != 0 && locomolcd_is_on) {
+ locomolcd_is_on = 0;
+ locomolcd_off();
+ }
+ return 0;
+}
+
+static int locomo_lcd_get_power(struct lcd_device *lcd)
+{
+ return !locomolcd_is_on;
+}
+
+static struct lcd_ops locomo_lcd_ops = {
+ .set_power = locomo_lcd_set_power,
+ .get_power = locomo_lcd_get_power,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int locomolcd_suspend(struct device *dev)
+{
+ locomolcd_is_suspended = true;
+ locomolcd_off();
+
+ return 0;
+}
+
+static int locomolcd_resume(struct device *dev)
+{
+ locomolcd_is_suspended = false;
+
+ if (locomolcd_is_on)
+ locomolcd_on();
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(locomolcd_pm, locomolcd_suspend, locomolcd_resume);
+#define LOCOMOLCD_PM (&locomolcd_pm)
+#else
+#define LOCOMOLCD_PM NULL
+#endif
+
+static int locomolcd_probe(struct platform_device *dev)
+{
+ unsigned long flags;
+ struct resource *res;
+ struct locomo_lcd_platform_data *pdata;
+ int rc;
+
+ res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+ locomolcd_regs = devm_ioremap_resource(&dev->dev, res);
+ if (!locomolcd_regs)
+ return -EINVAL;
+
+ pdata = dev_get_platdata(&dev->dev);
+ if (!pdata)
+ return -EINVAL;
+
+ lcd_data = *pdata;
+
+ locomo_gpios[0].gpio = lcd_data.gpio_lcd_vsha_on;
+ locomo_gpios[1].gpio = lcd_data.gpio_lcd_vshd_on;
+ locomo_gpios[2].gpio = lcd_data.gpio_lcd_vee_on;
+ locomo_gpios[3].gpio = lcd_data.gpio_lcd_mod;
+ dev_info(&dev->dev, "GPIOs: %d %d %d %d\n",
+ locomo_gpios[0].gpio,
+ locomo_gpios[1].gpio,
+ locomo_gpios[2].gpio,
+ locomo_gpios[3].gpio);
+
+ rc = gpio_request_array(locomo_gpios, ARRAY_SIZE(locomo_gpios));
+ if (rc)
+ return rc;
+
+ local_irq_save(flags);
+ locomolcd_dev = dev;
+
+ locomolcd_is_on = 1;
+ if (locomolcd_is_on)
+ locomolcd_on();
+
+ local_irq_restore(flags);
+
+ lcd_dev = lcd_device_register("locomo", &dev->dev, NULL,
+ &locomo_lcd_ops);
+
+ return 0;
+}
+
+static int locomolcd_remove(struct platform_device *dev)
+{
+ unsigned long flags;
+
+ lcd_device_unregister(lcd_dev);
+
+ local_irq_save(flags);
+
+ locomolcd_off();
+ locomolcd_dev = NULL;
+
+ local_irq_restore(flags);
+
+ gpio_free_array(locomo_gpios, ARRAY_SIZE(locomo_gpios));
+
+ return 0;
+}
+
+static void locomolcd_shutdown(struct platform_device *dev)
+{
+ locomolcd_off();
+}
+
+static struct platform_driver locomolcd_driver = {
+ .driver = {
+ .name = "locomo-lcd",
+ .owner = THIS_MODULE,
+ .pm = LOCOMOLCD_PM,
+ },
+ .probe = locomolcd_probe,
+ .remove = locomolcd_remove,
+ .shutdown = locomolcd_shutdown,
+};
+
+module_platform_driver(locomolcd_driver);
+
+MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
+MODULE_DESCRIPTION("Collie LCD driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:locomo-lcd");