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-rw-r--r--include/linux/pwm.h108
1 files changed, 106 insertions, 2 deletions
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 21d076c5089e..112b31436848 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -1,11 +1,13 @@
#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) || IS_ENABLED(CONFIG_HAVE_PWM)
/*
* pwm_request - request a PWM device
*/
@@ -30,10 +32,47 @@ 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
-#ifdef CONFIG_PWM
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,
@@ -61,11 +100,17 @@ static inline unsigned int pwm_get_period(struct pwm_device *pwm)
return pwm ? pwm->period : 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
@@ -79,6 +124,9 @@ struct pwm_ops {
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,
@@ -113,6 +161,7 @@ struct pwm_chip {
unsigned int of_pwm_n_cells;
};
+#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);
@@ -125,6 +174,57 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
struct pwm_device *pwm_get(struct device *dev, const char *consumer);
void pwm_put(struct pwm_device *pwm);
+struct pwm_device *devm_pwm_get(struct device *dev, const char *consumer);
+void devm_pwm_put(struct device *dev, 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 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 void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
+{
+}
+#endif
+
struct pwm_lookup {
struct list_head list;
const char *provider;
@@ -141,8 +241,12 @@ struct pwm_lookup {
.con_id = _con_id, \
}
+#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
#endif /* __LINUX_PWM_H */