[kernel] Add the generic PWM api from Bill Gatliff (experimental). Ignore the leds trigger part at the moment

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21800 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 165 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/files/include/linux/pwm/pwm.h b/target/linux/generic-2.6/files/include/linux/pwm/pwm.h
new file mode 100644
index 0000000000..e01cca9036
--- /dev/null
+++ b/target/linux/generic-2.6/files/include/linux/pwm/pwm.h
@@ -0,0 +1,165 @@
+/*
+ * include/linux/pwm.h
+ *
+ * Copyright (C) 2008 Bill Gatliff < bgat@billgatliff.com>
+ *
+ * This program is free software; you may redistribute and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+#ifndef __LINUX_PWM_H
+#define __LINUX_PWM_H
+
+enum {
+	PWM_CONFIG_DUTY_TICKS = BIT(0),
+	PWM_CONFIG_PERIOD_TICKS = BIT(1),
+	PWM_CONFIG_POLARITY = BIT(2),
+	PWM_CONFIG_START = BIT(3),
+	PWM_CONFIG_STOP = BIT(4),
+
+	PWM_CONFIG_HANDLER = BIT(5),
+
+	PWM_CONFIG_DUTY_NS = BIT(6),
+	PWM_CONFIG_DUTY_PERCENT = BIT(7),
+	PWM_CONFIG_PERIOD_NS = BIT(8),
+};
+
+struct pwm_channel;
+struct work_struct;
+
+typedef int (*pwm_handler_t)(struct pwm_channel *p, void *data);
+typedef void (*pwm_callback_t)(struct pwm_channel *p);
+
+struct pwm_channel_config {
+	int config_mask;
+	unsigned long duty_ticks;
+	unsigned long period_ticks;
+	int polarity;
+
+	pwm_handler_t handler;
+
+	unsigned long duty_ns;
+	unsigned long period_ns;
+	int duty_percent;
+};
+
+struct pwm_device {
+	struct list_head list;
+	spinlock_t list_lock;
+	struct device *dev;
+	struct module *owner;
+	struct pwm_channel *channels;
+
+	const char *bus_id;
+	int nchan;
+
+	int	(*request)	(struct pwm_channel *p);
+	void	(*free)		(struct pwm_channel *p);
+	int	(*config)	(struct pwm_channel *p,
+				 struct pwm_channel_config *c);
+	int	(*config_nosleep)(struct pwm_channel *p,
+				  struct pwm_channel_config *c);
+	int	(*synchronize)	(struct pwm_channel *p,
+				 struct pwm_channel *to_p);
+	int	(*unsynchronize)(struct pwm_channel *p,
+				 struct pwm_channel *from_p);
+	int	(*set_callback)	(struct pwm_channel *p,
+				 pwm_callback_t callback);
+};
+
+int pwm_register(struct pwm_device *pwm);
+int pwm_unregister(struct pwm_device *pwm);
+
+enum {
+	FLAG_REQUESTED = 0,
+	FLAG_STOP = 1,
+};
+
+struct pwm_channel {
+	struct list_head list;
+	struct pwm_device *pwm;
+	const char *requester;
+	pid_t pid;
+	int chan;
+	unsigned long flags;
+	unsigned long tick_hz;
+
+	spinlock_t lock;
+	struct completion complete;
+
+	pwm_callback_t callback;
+
+	struct work_struct handler_work;
+	pwm_handler_t handler;
+	void *handler_data;
+
+	int active_high;
+	unsigned long period_ticks;
+	unsigned long duty_ticks;
+};
+
+struct gpio_pwm_platform_data {
+	int gpio;
+};
+
+struct pwm_channel *
+pwm_request(const char *bus_id, int chan,
+	    const char *requester);
+
+void pwm_free(struct pwm_channel *pwm);
+
+int pwm_config_nosleep(struct pwm_channel *pwm,
+		       struct pwm_channel_config *c);
+
+int pwm_config(struct pwm_channel *pwm,
+	       struct pwm_channel_config *c);
+
+unsigned long pwm_ns_to_ticks(struct pwm_channel *pwm,
+			      unsigned long nsecs);
+
+unsigned long pwm_ticks_to_ns(struct pwm_channel *pwm,
+			      unsigned long ticks);
+
+int pwm_set_period_ns(struct pwm_channel *pwm,
+		      unsigned long period_ns);
+
+unsigned long int pwm_get_period_ns(struct pwm_channel *pwm);
+
+int pwm_set_duty_ns(struct pwm_channel *pwm,
+		    unsigned long duty_ns);
+
+int pwm_set_duty_percent(struct pwm_channel *pwm,
+			 int percent);
+
+unsigned long pwm_get_duty_ns(struct pwm_channel *pwm);
+
+int pwm_set_polarity(struct pwm_channel *pwm,
+		     int active_high);
+
+int pwm_start(struct pwm_channel *pwm);
+
+int pwm_stop(struct pwm_channel *pwm);
+
+int pwm_set_handler(struct pwm_channel *pwm,
+		    pwm_handler_t handler,
+		    void *data);
+
+int pwm_synchronize(struct pwm_channel *p,
+		    struct pwm_channel *to_p);
+
+
+int pwm_unsynchronize(struct pwm_channel *p,
+		      struct pwm_channel *from_p);
+
+
+#endif /* __LINUX_PWM_H */