#define __LINUX_PWM_H
#include <linux/err.h>
+#include <linux/mutex.h>
#include <linux/of.h>
struct pwm_device;
PWMF_EXPORTED = 1 << 2,
};
+/**
+ * struct pwm_device - PWM channel object
+ * @label: name of the PWM device
+ * @flags: flags associated with the PWM device
+ * @hwpwm: per-chip relative index of the PWM device
+ * @pwm: global index of the PWM device
+ * @chip: PWM chip providing this PWM device
+ * @chip_data: chip-private data associated with the PWM device
+ * @lock: used to serialize accesses to the PWM device where necessary
+ * @period: period of the PWM signal (in nanoseconds)
+ * @duty_cycle: duty cycle of the PWM signal (in nanoseconds)
+ * @polarity: polarity of the PWM signal
+ */
struct pwm_device {
- const char *label;
- unsigned long flags;
- unsigned int hwpwm;
- unsigned int pwm;
- struct pwm_chip *chip;
- void *chip_data;
-
- unsigned int period; /* in nanoseconds */
- unsigned int duty_cycle; /* in nanoseconds */
- enum pwm_polarity polarity;
+ const char *label;
+ unsigned long flags;
+ unsigned int hwpwm;
+ unsigned int pwm;
+ struct pwm_chip *chip;
+ void *chip_data;
+ struct mutex lock;
+
+ unsigned int period;
+ unsigned int duty_cycle;
+ enum pwm_polarity polarity;
};
+static inline bool pwm_is_enabled(const struct pwm_device *pwm)
+{
+ return test_bit(PWMF_ENABLED, &pwm->flags);
+}
+
static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
{
if (pwm)
pwm->period = period;
}
-static inline unsigned int pwm_get_period(struct pwm_device *pwm)
+static inline unsigned int pwm_get_period(const struct pwm_device *pwm)
{
return pwm ? pwm->period : 0;
}
pwm->duty_cycle = duty;
}
-static inline unsigned int pwm_get_duty_cycle(struct pwm_device *pwm)
+static inline unsigned int pwm_get_duty_cycle(const struct pwm_device *pwm)
{
return pwm ? pwm->duty_cycle : 0;
}
*/
int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity);
+static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm)
+{
+ return pwm ? pwm->polarity : PWM_POLARITY_NORMAL;
+}
+
/**
* struct pwm_ops - PWM controller operations
* @request: optional hook for requesting a PWM
* @owner: helps prevent removal of modules exporting active PWMs
*/
struct pwm_ops {
- int (*request)(struct pwm_chip *chip,
- struct pwm_device *pwm);
- void (*free)(struct pwm_chip *chip,
- struct pwm_device *pwm);
- int (*config)(struct pwm_chip *chip,
- struct pwm_device *pwm,
- int duty_ns, int period_ns);
- int (*set_polarity)(struct pwm_chip *chip,
- struct pwm_device *pwm,
- enum pwm_polarity polarity);
- int (*enable)(struct pwm_chip *chip,
- struct pwm_device *pwm);
- void (*disable)(struct pwm_chip *chip,
- struct pwm_device *pwm);
+ int (*request)(struct pwm_chip *chip, struct pwm_device *pwm);
+ void (*free)(struct pwm_chip *chip, struct pwm_device *pwm);
+ int (*config)(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns);
+ int (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm,
+ enum pwm_polarity polarity);
+ int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm);
+ void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm);
#ifdef CONFIG_DEBUG_FS
- void (*dbg_show)(struct pwm_chip *chip,
- struct seq_file *s);
+ void (*dbg_show)(struct pwm_chip *chip, struct seq_file *s);
#endif
- struct module *owner;
+ struct module *owner;
};
/**
* @base: number of first PWM controlled by this chip
* @npwm: number of PWMs controlled by this chip
* @pwms: array of PWM devices allocated by the framework
+ * @of_xlate: request a PWM device given a device tree PWM specifier
+ * @of_pwm_n_cells: number of cells expected in the device tree PWM specifier
* @can_sleep: must be true if the .config(), .enable() or .disable()
* operations may sleep
*/
struct pwm_chip {
- struct device *dev;
- struct list_head list;
- const struct pwm_ops *ops;
- int base;
- unsigned int npwm;
-
- struct pwm_device *pwms;
-
- struct pwm_device * (*of_xlate)(struct pwm_chip *pc,
- const struct of_phandle_args *args);
- unsigned int of_pwm_n_cells;
- bool can_sleep;
+ struct device *dev;
+ struct list_head list;
+ const struct pwm_ops *ops;
+ int base;
+ unsigned int npwm;
+
+ struct pwm_device *pwms;
+
+ struct pwm_device * (*of_xlate)(struct pwm_chip *pc,
+ const struct of_phandle_args *args);
+ unsigned int of_pwm_n_cells;
+ bool can_sleep;
};
#if IS_ENABLED(CONFIG_PWM)
int pwm_set_chip_data(struct pwm_device *pwm, void *data);
void *pwm_get_chip_data(struct pwm_device *pwm);
+int pwmchip_add_with_polarity(struct pwm_chip *chip,
+ enum pwm_polarity polarity);
int pwmchip_add(struct pwm_chip *chip);
int pwmchip_remove(struct pwm_chip *chip);
struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
return -EINVAL;
}
+static inline int pwmchip_add_inversed(struct pwm_chip *chip)
+{
+ return -EINVAL;
+}
+
static inline int pwmchip_remove(struct pwm_chip *chip)
{
return -EINVAL;
#if IS_ENABLED(CONFIG_PWM)
void pwm_add_table(struct pwm_lookup *table, size_t num);
+void pwm_remove_table(struct pwm_lookup *table, size_t num);
#else
static inline void pwm_add_table(struct pwm_lookup *table, size_t num)
{
}
+
+static inline void pwm_remove_table(struct pwm_lookup *table, size_t num)
+{
+}
#endif
#ifdef CONFIG_PWM_SYSFS
Code Review / kvmfornfv.git / blobdiff