10 #if IS_ENABLED(CONFIG_PWM)
12 * pwm_request - request a PWM device
14 struct pwm_device *pwm_request(int pwm_id, const char *label);
17 * pwm_free - free a PWM device
19 void pwm_free(struct pwm_device *pwm);
22 * pwm_config - change a PWM device configuration
24 int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
27 * pwm_enable - start a PWM output toggling
29 int pwm_enable(struct pwm_device *pwm);
32 * pwm_disable - stop a PWM output toggling
34 void pwm_disable(struct pwm_device *pwm);
36 static inline struct pwm_device *pwm_request(int pwm_id, const char *label)
38 return ERR_PTR(-ENODEV);
41 static inline void pwm_free(struct pwm_device *pwm)
45 static inline int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
50 static inline int pwm_enable(struct pwm_device *pwm)
55 static inline void pwm_disable(struct pwm_device *pwm)
63 * enum pwm_polarity - polarity of a PWM signal
64 * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty-
65 * cycle, followed by a low signal for the remainder of the pulse
67 * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty-
68 * cycle, followed by a high signal for the remainder of the pulse
73 PWM_POLARITY_INVERSED,
77 PWMF_REQUESTED = 1 << 0,
78 PWMF_ENABLED = 1 << 1,
79 PWMF_EXPORTED = 1 << 2,
87 struct pwm_chip *chip;
90 unsigned int period; /* in nanoseconds */
91 unsigned int duty_cycle; /* in nanoseconds */
92 enum pwm_polarity polarity;
95 static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
101 static inline unsigned int pwm_get_period(struct pwm_device *pwm)
103 return pwm ? pwm->period : 0;
106 static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty)
109 pwm->duty_cycle = duty;
112 static inline unsigned int pwm_get_duty_cycle(struct pwm_device *pwm)
114 return pwm ? pwm->duty_cycle : 0;
118 * pwm_set_polarity - configure the polarity of a PWM signal
120 int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity);
123 * struct pwm_ops - PWM controller operations
124 * @request: optional hook for requesting a PWM
125 * @free: optional hook for freeing a PWM
126 * @config: configure duty cycles and period length for this PWM
127 * @set_polarity: configure the polarity of this PWM
128 * @enable: enable PWM output toggling
129 * @disable: disable PWM output toggling
130 * @dbg_show: optional routine to show contents in debugfs
131 * @owner: helps prevent removal of modules exporting active PWMs
134 int (*request)(struct pwm_chip *chip,
135 struct pwm_device *pwm);
136 void (*free)(struct pwm_chip *chip,
137 struct pwm_device *pwm);
138 int (*config)(struct pwm_chip *chip,
139 struct pwm_device *pwm,
140 int duty_ns, int period_ns);
141 int (*set_polarity)(struct pwm_chip *chip,
142 struct pwm_device *pwm,
143 enum pwm_polarity polarity);
144 int (*enable)(struct pwm_chip *chip,
145 struct pwm_device *pwm);
146 void (*disable)(struct pwm_chip *chip,
147 struct pwm_device *pwm);
148 #ifdef CONFIG_DEBUG_FS
149 void (*dbg_show)(struct pwm_chip *chip,
152 struct module *owner;
156 * struct pwm_chip - abstract a PWM controller
157 * @dev: device providing the PWMs
158 * @list: list node for internal use
159 * @ops: callbacks for this PWM controller
160 * @base: number of first PWM controlled by this chip
161 * @npwm: number of PWMs controlled by this chip
162 * @pwms: array of PWM devices allocated by the framework
163 * @can_sleep: must be true if the .config(), .enable() or .disable()
164 * operations may sleep
168 struct list_head list;
169 const struct pwm_ops *ops;
173 struct pwm_device *pwms;
175 struct pwm_device * (*of_xlate)(struct pwm_chip *pc,
176 const struct of_phandle_args *args);
180 #if IS_ENABLED(CONFIG_PWM)
181 int pwm_set_chip_data(struct pwm_device *pwm, void *data);
182 void *pwm_get_chip_data(struct pwm_device *pwm);
184 int pwmchip_add(struct pwm_chip *chip);
185 int pwmchip_remove(struct pwm_chip *chip);
186 struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
190 struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc,
191 const struct of_phandle_args *args);
193 struct pwm_device *pwm_get(struct device *dev, const char *con_id);
194 struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id);
195 void pwm_put(struct pwm_device *pwm);
197 struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id);
198 struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
200 void devm_pwm_put(struct device *dev, struct pwm_device *pwm);
202 bool pwm_can_sleep(struct pwm_device *pwm);
204 static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data)
209 static inline void *pwm_get_chip_data(struct pwm_device *pwm)
214 static inline int pwmchip_add(struct pwm_chip *chip)
219 static inline int pwmchip_remove(struct pwm_chip *chip)
224 static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
228 return ERR_PTR(-ENODEV);
231 static inline struct pwm_device *pwm_get(struct device *dev,
232 const char *consumer)
234 return ERR_PTR(-ENODEV);
237 static inline struct pwm_device *of_pwm_get(struct device_node *np,
240 return ERR_PTR(-ENODEV);
243 static inline void pwm_put(struct pwm_device *pwm)
247 static inline struct pwm_device *devm_pwm_get(struct device *dev,
248 const char *consumer)
250 return ERR_PTR(-ENODEV);
253 static inline struct pwm_device *devm_of_pwm_get(struct device *dev,
254 struct device_node *np,
257 return ERR_PTR(-ENODEV);
260 static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
264 static inline bool pwm_can_sleep(struct pwm_device *pwm)
271 struct list_head list;
272 const char *provider;
277 enum pwm_polarity polarity;
280 #define PWM_LOOKUP(_provider, _index, _dev_id, _con_id, _period, _polarity) \
282 .provider = _provider, \
287 .polarity = _polarity \
290 #if IS_ENABLED(CONFIG_PWM)
291 void pwm_add_table(struct pwm_lookup *table, size_t num);
293 static inline void pwm_add_table(struct pwm_lookup *table, size_t num)
298 #ifdef CONFIG_PWM_SYSFS
299 void pwmchip_sysfs_export(struct pwm_chip *chip);
300 void pwmchip_sysfs_unexport(struct pwm_chip *chip);
302 static inline void pwmchip_sysfs_export(struct pwm_chip *chip)
306 static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip)
309 #endif /* CONFIG_PWM_SYSFS */
311 #endif /* __LINUX_PWM_H */