--- /dev/null
+#ifndef __LINUX_PWM_H
+#define __LINUX_PWM_H
+
+#include <linux/err.h>
+#include <linux/of.h>
+
+struct pwm_device;
+struct seq_file;
+
+#if IS_ENABLED(CONFIG_PWM)
+/*
+ * pwm_request - request a PWM device
+ */
+struct pwm_device *pwm_request(int pwm_id, const char *label);
+
+/*
+ * pwm_free - free a PWM device
+ */
+void pwm_free(struct pwm_device *pwm);
+
+/*
+ * pwm_config - change a PWM device configuration
+ */
+int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
+
+/*
+ * pwm_enable - start a PWM output toggling
+ */
+int pwm_enable(struct pwm_device *pwm);
+
+/*
+ * pwm_disable - stop a PWM output toggling
+ */
+void pwm_disable(struct pwm_device *pwm);
+#else
+static inline struct pwm_device *pwm_request(int pwm_id, const char *label)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void pwm_free(struct pwm_device *pwm)
+{
+}
+
+static inline int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+ return -EINVAL;
+}
+
+static inline int pwm_enable(struct pwm_device *pwm)
+{
+ return -EINVAL;
+}
+
+static inline void pwm_disable(struct pwm_device *pwm)
+{
+}
+#endif
+
+struct pwm_chip;
+
+/**
+ * enum pwm_polarity - polarity of a PWM signal
+ * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty-
+ * cycle, followed by a low signal for the remainder of the pulse
+ * period
+ * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty-
+ * cycle, followed by a high signal for the remainder of the pulse
+ * period
+ */
+enum pwm_polarity {
+ PWM_POLARITY_NORMAL,
+ PWM_POLARITY_INVERSED,
+};
+
+enum {
+ PWMF_REQUESTED = 1 << 0,
+ PWMF_ENABLED = 1 << 1,
+ PWMF_EXPORTED = 1 << 2,
+};
+
+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;
+};
+
+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)
+{
+ return pwm ? pwm->period : 0;
+}
+
+static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty)
+{
+ if (pwm)
+ pwm->duty_cycle = duty;
+}
+
+static inline unsigned int pwm_get_duty_cycle(struct pwm_device *pwm)
+{
+ return pwm ? pwm->duty_cycle : 0;
+}
+
+/*
+ * pwm_set_polarity - configure the polarity of a PWM signal
+ */
+int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity);
+
+/**
+ * struct pwm_ops - PWM controller operations
+ * @request: optional hook for requesting a PWM
+ * @free: optional hook for freeing a PWM
+ * @config: configure duty cycles and period length for this PWM
+ * @set_polarity: configure the polarity of this PWM
+ * @enable: enable PWM output toggling
+ * @disable: disable PWM output toggling
+ * @dbg_show: optional routine to show contents in debugfs
+ * @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);
+#ifdef CONFIG_DEBUG_FS
+ void (*dbg_show)(struct pwm_chip *chip,
+ struct seq_file *s);
+#endif
+ struct module *owner;
+};
+
+/**
+ * struct pwm_chip - abstract a PWM controller
+ * @dev: device providing the PWMs
+ * @list: list node for internal use
+ * @ops: callbacks for this PWM controller
+ * @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
+ * @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;
+};
+
+#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(struct pwm_chip *chip);
+int pwmchip_remove(struct pwm_chip *chip);
+struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
+ unsigned int index,
+ const char *label);
+
+struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc,
+ const struct of_phandle_args *args);
+
+struct pwm_device *pwm_get(struct device *dev, const char *con_id);
+struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id);
+void pwm_put(struct pwm_device *pwm);
+
+struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id);
+struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
+ const char *con_id);
+void devm_pwm_put(struct device *dev, struct pwm_device *pwm);
+
+bool pwm_can_sleep(struct pwm_device *pwm);
+#else
+static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data)
+{
+ return -EINVAL;
+}
+
+static inline void *pwm_get_chip_data(struct pwm_device *pwm)
+{
+ return NULL;
+}
+
+static inline int pwmchip_add(struct pwm_chip *chip)
+{
+ return -EINVAL;
+}
+
+static inline int pwmchip_remove(struct pwm_chip *chip)
+{
+ return -EINVAL;
+}
+
+static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
+ unsigned int index,
+ const char *label)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline struct pwm_device *pwm_get(struct device *dev,
+ const char *consumer)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline struct pwm_device *of_pwm_get(struct device_node *np,
+ const char *con_id)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void pwm_put(struct pwm_device *pwm)
+{
+}
+
+static inline struct pwm_device *devm_pwm_get(struct device *dev,
+ const char *consumer)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline struct pwm_device *devm_of_pwm_get(struct device *dev,
+ struct device_node *np,
+ const char *con_id)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
+{
+}
+
+static inline bool pwm_can_sleep(struct pwm_device *pwm)
+{
+ return false;
+}
+#endif
+
+struct pwm_lookup {
+ struct list_head list;
+ const char *provider;
+ unsigned int index;
+ const char *dev_id;
+ const char *con_id;
+ unsigned int period;
+ enum pwm_polarity polarity;
+};
+
+#define PWM_LOOKUP(_provider, _index, _dev_id, _con_id, _period, _polarity) \
+ { \
+ .provider = _provider, \
+ .index = _index, \
+ .dev_id = _dev_id, \
+ .con_id = _con_id, \
+ .period = _period, \
+ .polarity = _polarity \
+ }
+
+#if IS_ENABLED(CONFIG_PWM)
+void pwm_add_table(struct pwm_lookup *table, size_t num);
+#else
+static inline void pwm_add_table(struct pwm_lookup *table, size_t num)
+{
+}
+#endif
+
+#ifdef CONFIG_PWM_SYSFS
+void pwmchip_sysfs_export(struct pwm_chip *chip);
+void pwmchip_sysfs_unexport(struct pwm_chip *chip);
+#else
+static inline void pwmchip_sysfs_export(struct pwm_chip *chip)
+{
+}
+
+static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip)
+{
+}
+#endif /* CONFIG_PWM_SYSFS */
+
+#endif /* __LINUX_PWM_H */
Code Review / kvmfornfv.git / blobdiff