Add gta02-vibrator driver.

3 files changed, 198 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 7c8e7122aaa..4ec74ef5e0b 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -229,6 +229,12 @@ config LEDS_BD2802
 	  This option enables support for BD2802GU RGB LED driver chips
 	  accessed via the I2C bus.
 
+config LEDS_GTA02_VIBRATOR
+	tristate "Vibrator Support for the Openmoko Freerunner GSM phone"
+	depends on LEDS_CLASS && MACH_NEO1973_GTA02
+ 	help
+	  This option enables support for the vibrator on the Openmoko Freerunner.
+
 comment "LED Triggers"
 
 config LEDS_TRIGGERS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index e8cdcf77a4c..edc24c2bebe 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_LEDS_PWM)			+= leds-pwm.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)		+= leds-dac124s085.o
+obj-$(CONFIG_LEDS_GTA02_VIBRATOR)	+= leds-gta02-vibrator.o
 
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o
diff --git a/drivers/leds/leds-gta02-vibrator.c b/drivers/leds/leds-gta02-vibrator.c
new file mode 100644
index 00000000000..138af6d1496
--- /dev/null
+++ b/drivers/leds/leds-gta02-vibrator.c
@@ -0,0 +1,191 @@
+/*
+ * LED driver for the vibrator of the Openmoko GTA01/GTA02 GSM Phones
+ *
+ * (C) 2006-2008 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.
+ *
+ * Javi Roman <javiroman@kernel-labs.org>:
+ *	Implement PWM support for GTA01Bv4 and later
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <mach/hardware.h>
+#include <asm/mach-types.h>
+#include <plat/pwm.h>
+#include <mach/regs-gpio.h>
+#include <mach/gpio-fns.h>
+#include <plat/regs-timer.h>
+#include <linux/gta02-vibrator.h>
+
+#define COUNTER 64
+
+static struct gta02_vib_priv {
+	struct led_classdev cdev;
+	unsigned int gpio;
+	spinlock_t lock;
+	unsigned int has_pwm;
+	struct s3c2410_pwm pwm;
+
+	unsigned long vib_gpio_pin; /* which pin to meddle with */
+	uint8_t vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
+	uint8_t vib_pwm_latched;
+	uint8_t fiq_count;
+
+	struct gta02_vib_platform_data *pdata;
+} gta02_vib_priv;
+
+int gta02_vibrator_fiq_handler(void)
+{
+	gta02_vib_priv.fiq_count++;
+
+	if (!gta02_vib_priv.vib_pwm_latched && !gta02_vib_priv.vib_pwm)
+		/* idle */
+		return 0;
+
+	if (gta02_vib_priv.fiq_count == gta02_vib_priv.vib_pwm_latched)
+		s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 0);
+
+	if (gta02_vib_priv.fiq_count)
+		return 1;
+
+	gta02_vib_priv.vib_pwm_latched = gta02_vib_priv.vib_pwm;
+	if (gta02_vib_priv.vib_pwm_latched)
+		s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 1);
+
+	return 1;
+}
+
+static void gta02_vib_vib_set(struct led_classdev *led_cdev,
+				enum led_brightness value)
+{
+	gta02_vib_priv.vib_pwm = value; /* set it for FIQ */
+	gta02_vib_priv.pdata->kick_fiq(); /* start up FIQs if not already going */
+}
+
+static struct gta02_vib_priv gta02_vib_led = {
+	.cdev = {
+		.name = "gta02:vibrator",
+		.brightness_set = gta02_vib_vib_set,
+	},
+};
+
+static int gta02_vib_init_hw(struct gta02_vib_priv *vp)
+{
+	int rc;
+
+	rc = s3c2410_pwm_init(&vp->pwm);
+	if (rc)
+		return rc;
+
+	vp->pwm.timerid = PWM3;
+	/* use same prescaler as arch/arm/plat-s3c24xx/time.c */
+	vp->pwm.prescaler = (6 - 1) / 2;
+	vp->pwm.divider = S3C2410_TCFG1_MUX3_DIV2;
+	vp->pwm.counter = COUNTER;
+	vp->pwm.comparer = COUNTER;
+
+	rc = s3c2410_pwm_enable(&vp->pwm);
+	if (rc)
+		return rc;
+
+	s3c2410_pwm_start(&vp->pwm);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int gta02_vib_suspend(struct platform_device *dev, pm_message_t state)
+{
+	led_classdev_suspend(&gta02_vib_led.cdev);
+	if (gta02_vib_priv.pdata)
+		gta02_vib_priv.pdata->disable_fiq();
+	return 0;
+}
+
+static int gta02_vib_resume(struct platform_device *dev)
+{
+	struct gta02_vib_priv *vp = platform_get_drvdata(dev);
+
+	if (vp->has_pwm)
+		gta02_vib_init_hw(vp);
+
+	led_classdev_resume(&gta02_vib_led.cdev);
+	if (gta02_vib_priv.pdata)
+		gta02_vib_priv.pdata->enable_fiq();
+
+	return 0;
+}
+#else
+#define gta02_vib_suspend NULL
+#define gta02_vib_resume NULL
+#endif /* CONFIG_PM */
+
+static int __init gta02_vib_probe(struct platform_device *pdev)
+{
+	struct resource *r;
+
+	r = platform_get_resource(pdev, 0, 0);
+	if (!r || !r->start)
+		return -EIO;
+
+	gta02_vib_led.gpio = r->start;
+
+	gta02_vib_priv.pdata = pdev->dev.platform_data;
+	platform_set_drvdata(pdev, &gta02_vib_led);
+
+	s3c2410_gpio_setpin(gta02_vib_led.gpio, 0); /* off */
+	s3c2410_gpio_cfgpin(gta02_vib_led.gpio, S3C2410_GPIO_OUTPUT);
+	/* safe, kmalloc'd copy needed for FIQ ISR */
+	gta02_vib_priv.vib_gpio_pin = gta02_vib_led.gpio;
+	gta02_vib_priv.vib_pwm = 0; /* off */
+	spin_lock_init(&gta02_vib_led.lock);
+
+	return led_classdev_register(&pdev->dev, &gta02_vib_led.cdev);
+}
+
+static int gta02_vib_remove(struct platform_device *pdev)
+{
+	gta02_vib_priv.vib_pwm = 0; /* off */
+	/* would only need kick if already off so no kick needed */
+
+	if (gta02_vib_led.has_pwm)
+		s3c2410_pwm_disable(&gta02_vib_led.pwm);
+
+	led_classdev_unregister(&gta02_vib_led.cdev);
+
+	return 0;
+}
+
+static struct platform_driver gta02_vib_driver = {
+	.probe		= gta02_vib_probe,
+	.remove		= gta02_vib_remove,
+	.suspend	= gta02_vib_suspend,
+	.resume		= gta02_vib_resume,
+	.driver		= {
+		.name		= "gta02-vibrator",
+	},
+};
+
+static int __init gta02_vib_init(void)
+{
+	return platform_driver_register(&gta02_vib_driver);
+}
+module_init(gta02_vib_init);
+
+static void __exit gta02_vib_exit(void)
+{
+	platform_driver_unregister(&gta02_vib_driver);
+}
+module_exit(gta02_vib_exit);
+
+MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
+MODULE_DESCRIPTION("Openmoko Freerunner vibrator driver");
+MODULE_LICENSE("GPL");