gta02-leds.patch

1 files changed, 226 insertions, 0 deletions

diff --git a/drivers/leds/leds-neo1973-gta02.c b/drivers/leds/leds-neo1973-gta02.c
new file mode 100644
index 00000000000..bf1d5407025
--- /dev/null
+++ b/drivers/leds/leds-neo1973-gta02.c
@@ -0,0 +1,226 @@
+/*
+ * LED driver for the FIC Neo1973 GTA02 GSM phone
+ *
+ * (C) 2006-2007 by OpenMoko, Inc.
+ * Author: Harald Welte <laforge@openmoko.org>
+ * All rights reserved.
+ *
+ * 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/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/arch/pwm.h>
+#include <asm/arch/gta02.h>
+#include <asm/plat-s3c/regs-timer.h>
+
+#define MAX_LEDS 3
+#define COUNTER 256
+
+struct gta02_led_priv
+{
+	struct mutex mutex;
+	struct led_classdev cdev;
+	struct s3c2410_pwm pwm;
+	unsigned int gpio;
+	unsigned int has_pwm;
+};
+
+struct gta02_led_bundle
+{
+	int num_leds;
+	struct gta02_led_priv led[MAX_LEDS];
+};
+
+static inline struct gta02_led_priv *to_priv(struct led_classdev *led_cdev)
+{
+	return container_of(led_cdev, struct gta02_led_priv, cdev);
+}
+
+static inline struct gta02_led_bundle *to_bundle(struct led_classdev *led_cdev)
+{
+	return dev_get_drvdata(led_cdev->dev);
+}
+
+static void gta02led_set(struct led_classdev *led_cdev,
+		enum led_brightness value)
+{
+	struct gta02_led_priv *lp = to_priv(led_cdev);
+
+	/*
+ 	 * value == 255 -> 99% duty cycle (full power)
+ 	 * value == 128 -> 50% duty cycle (medium power)
+ 	 * value == 0 -> 0% duty cycle (zero power)
+ 	 */
+ 	mutex_lock(&lp->mutex);
+	if (lp->has_pwm) {
+			s3c2410_pwm_duty_cycle(value, &lp->pwm);
+	} else {
+		if (value)
+			s3c2410_gpio_setpin(lp->gpio, 1);
+		else
+			s3c2410_gpio_setpin(lp->gpio, 0);
+	}
+	mutex_unlock(&lp->mutex);
+}
+
+#ifdef CONFIG_PM
+static int gta02led_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct gta02_led_bundle *bundle = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < bundle->num_leds; i++)
+		led_classdev_suspend(&bundle->led[i].cdev);
+
+	return 0;
+}
+
+static int gta02led_resume(struct platform_device *pdev)
+{
+	struct gta02_led_bundle *bundle = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < bundle->num_leds; i++)
+		led_classdev_resume(&bundle->led[i].cdev);
+
+	return 0;
+}
+#endif
+
+static int __init gta02led_probe(struct platform_device *pdev)
+{
+	int i, rc;
+	struct gta02_led_bundle *bundle;
+
+	if (!machine_is_neo1973_gta02())
+		return -EIO;
+
+	bundle = kzalloc(sizeof(struct gta02_led_bundle), GFP_KERNEL);
+	if (!bundle)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, bundle);
+
+	for (i = 0; i < pdev->num_resources; i++) {
+		struct gta02_led_priv *lp;
+		struct resource *r;
+
+		if (i >= MAX_LEDS)
+			break;
+
+		r = platform_get_resource(pdev, 0, i);
+		if (!r || !r->start || !r->name)
+			continue;
+
+		lp = &bundle->led[i];
+
+		lp->gpio = r->start;
+		lp->cdev.name = r->name;
+		lp->cdev.brightness_set = gta02led_set;
+
+		switch (lp->gpio) {
+		case S3C2410_GPB0:
+			lp->has_pwm = 1;
+			lp->pwm.timerid = PWM0;
+			s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPB0_TOUT0);
+			break;
+		case S3C2410_GPB1:
+			lp->has_pwm = 1;
+			lp->pwm.timerid = PWM1;
+			s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPB1_TOUT1);
+			break;
+		case S3C2410_GPB2:
+			lp->has_pwm = 1;
+			lp->pwm.timerid = PWM2;
+			s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPB2_TOUT2);
+			break;
+		case S3C2410_GPB3:
+			lp->has_pwm = 1;
+			lp->pwm.timerid = PWM3;
+			s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPB3_TOUT3);
+			break;
+		default:
+			break;
+		}
+
+		lp->pwm.prescaler = 0;
+		lp->pwm.divider = S3C2410_TCFG1_MUX3_DIV8;
+		lp->pwm.counter = COUNTER;
+		lp->pwm.comparer = COUNTER;
+		s3c2410_pwm_enable(&lp->pwm);
+		s3c2410_pwm_start(&lp->pwm);
+
+		switch (lp->gpio) {
+		case S3C2410_GPB0:
+		case S3C2410_GPB1:
+		case S3C2410_GPB2:
+			lp->has_pwm = 0;
+			s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPIO_OUTPUT);
+			s3c2410_gpio_setpin(lp->gpio, 0);
+			break;
+		default:
+			break;
+		}
+
+		mutex_init(&lp->mutex);
+		rc = led_classdev_register(&pdev->dev, &lp->cdev);
+	}
+
+	return 0;
+}
+
+static int gta02led_remove(struct platform_device *pdev)
+{
+	struct gta02_led_bundle *bundle = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < bundle->num_leds; i++) {
+		struct gta02_led_priv *lp = &bundle->led[i];
+		if (lp->has_pwm)
+			s3c2410_pwm_disable(&lp->pwm);
+
+		led_classdev_unregister(&lp->cdev);
+		mutex_destroy(&lp->mutex);
+	}
+
+	platform_set_drvdata(pdev, NULL);
+	kfree(bundle);
+
+	return 0;
+}
+
+static struct platform_driver gta02led_driver = {
+	.probe		= gta02led_probe,
+	.remove		= gta02led_remove,
+#ifdef CONFIG_PM
+	.suspend	= gta02led_suspend,
+	.resume		= gta02led_resume,
+#endif
+	.driver		= {
+		.name		= "gta02-led",
+	},
+};
+
+static int __init gta02led_init(void)
+{
+	return platform_driver_register(&gta02led_driver);
+}
+
+static void __exit gta02led_exit(void)
+{
+ 	platform_driver_unregister(&gta02led_driver);
+}
+
+module_init(gta02led_init);
+module_exit(gta02led_exit);
+
+MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
+MODULE_DESCRIPTION("FIC Neo1973 GTA02 LED driver");
+MODULE_LICENSE("GPL");