5 #include <linux/mutex.h>
11 #if IS_ENABLED(CONFIG_PWM)
13 * pwm_request - request a PWM device
15 struct pwm_device *pwm_request(int pwm_id, const char *label);
18 * pwm_free - free a PWM device
20 void pwm_free(struct pwm_device *pwm);
23 * pwm_config - change a PWM device configuration
25 int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
28 * pwm_enable - start a PWM output toggling
30 int pwm_enable(struct pwm_device *pwm);
33 * pwm_disable - stop a PWM output toggling
35 void pwm_disable(struct pwm_device *pwm);
37 static inline struct pwm_device *pwm_request(int pwm_id, const char *label)
39 return ERR_PTR(-ENODEV);
42 static inline void pwm_free(struct pwm_device *pwm)
46 static inline int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
51 static inline int pwm_enable(struct pwm_device *pwm)
56 static inline void pwm_disable(struct pwm_device *pwm)
64 * enum pwm_polarity - polarity of a PWM signal
65 * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty-
66 * cycle, followed by a low signal for the remainder of the pulse
68 * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty-
69 * cycle, followed by a high signal for the remainder of the pulse
74 PWM_POLARITY_INVERSED,
78 * struct pwm_args - board-dependent PWM arguments
79 * @period: reference period
80 * @polarity: reference polarity
82 * This structure describes board-dependent arguments attached to a PWM
83 * device. These arguments are usually retrieved from the PWM lookup table or
86 * Do not confuse this with the PWM state: PWM arguments represent the initial
87 * configuration that users want to use on this PWM device rather than the
88 * current PWM hardware state.
92 enum pwm_polarity polarity;
96 PWMF_REQUESTED = 1 << 0,
97 PWMF_ENABLED = 1 << 1,
98 PWMF_EXPORTED = 1 << 2,
102 * struct pwm_device - PWM channel object
103 * @label: name of the PWM device
104 * @flags: flags associated with the PWM device
105 * @hwpwm: per-chip relative index of the PWM device
106 * @pwm: global index of the PWM device
107 * @chip: PWM chip providing this PWM device
108 * @chip_data: chip-private data associated with the PWM device
109 * @period: period of the PWM signal (in nanoseconds)
110 * @duty_cycle: duty cycle of the PWM signal (in nanoseconds)
111 * @polarity: polarity of the PWM signal
112 * @args: PWM arguments
119 struct pwm_chip *chip;
123 unsigned int duty_cycle;
124 enum pwm_polarity polarity;
126 struct pwm_args args;
129 static inline bool pwm_is_enabled(const struct pwm_device *pwm)
131 return test_bit(PWMF_ENABLED, &pwm->flags);
134 static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
137 pwm->period = period;
140 static inline unsigned int pwm_get_period(const struct pwm_device *pwm)
142 return pwm ? pwm->period : 0;
145 static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty)
148 pwm->duty_cycle = duty;
151 static inline unsigned int pwm_get_duty_cycle(const struct pwm_device *pwm)
153 return pwm ? pwm->duty_cycle : 0;
157 * pwm_set_polarity - configure the polarity of a PWM signal
159 int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity);
161 static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm)
163 return pwm ? pwm->polarity : PWM_POLARITY_NORMAL;
166 static inline void pwm_get_args(const struct pwm_device *pwm,
167 struct pwm_args *args)
172 static inline void pwm_apply_args(struct pwm_device *pwm)
174 pwm_set_period(pwm, pwm->args.period);
175 pwm_set_polarity(pwm, pwm->args.polarity);
179 * struct pwm_ops - PWM controller operations
180 * @request: optional hook for requesting a PWM
181 * @free: optional hook for freeing a PWM
182 * @config: configure duty cycles and period length for this PWM
183 * @set_polarity: configure the polarity of this PWM
184 * @enable: enable PWM output toggling
185 * @disable: disable PWM output toggling
186 * @dbg_show: optional routine to show contents in debugfs
187 * @owner: helps prevent removal of modules exporting active PWMs
190 int (*request)(struct pwm_chip *chip, struct pwm_device *pwm);
191 void (*free)(struct pwm_chip *chip, struct pwm_device *pwm);
192 int (*config)(struct pwm_chip *chip, struct pwm_device *pwm,
193 int duty_ns, int period_ns);
194 int (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm,
195 enum pwm_polarity polarity);
196 int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm);
197 void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm);
198 #ifdef CONFIG_DEBUG_FS
199 void (*dbg_show)(struct pwm_chip *chip, struct seq_file *s);
201 struct module *owner;
205 * struct pwm_chip - abstract a PWM controller
206 * @dev: device providing the PWMs
207 * @list: list node for internal use
208 * @ops: callbacks for this PWM controller
209 * @base: number of first PWM controlled by this chip
210 * @npwm: number of PWMs controlled by this chip
211 * @pwms: array of PWM devices allocated by the framework
212 * @of_xlate: request a PWM device given a device tree PWM specifier
213 * @of_pwm_n_cells: number of cells expected in the device tree PWM specifier
214 * @can_sleep: must be true if the .config(), .enable() or .disable()
215 * operations may sleep
219 struct list_head list;
220 const struct pwm_ops *ops;
224 struct pwm_device *pwms;
226 struct pwm_device * (*of_xlate)(struct pwm_chip *pc,
227 const struct of_phandle_args *args);
228 unsigned int of_pwm_n_cells;
232 #if IS_ENABLED(CONFIG_PWM)
233 int pwm_set_chip_data(struct pwm_device *pwm, void *data);
234 void *pwm_get_chip_data(struct pwm_device *pwm);
236 int pwmchip_add_with_polarity(struct pwm_chip *chip,
237 enum pwm_polarity polarity);
238 int pwmchip_add(struct pwm_chip *chip);
239 int pwmchip_remove(struct pwm_chip *chip);
240 struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
244 struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc,
245 const struct of_phandle_args *args);
247 struct pwm_device *pwm_get(struct device *dev, const char *con_id);
248 struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id);
249 void pwm_put(struct pwm_device *pwm);
251 struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id);
252 struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
254 void devm_pwm_put(struct device *dev, struct pwm_device *pwm);
256 bool pwm_can_sleep(struct pwm_device *pwm);
258 static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data)
263 static inline void *pwm_get_chip_data(struct pwm_device *pwm)
268 static inline int pwmchip_add(struct pwm_chip *chip)
273 static inline int pwmchip_add_inversed(struct pwm_chip *chip)
278 static inline int pwmchip_remove(struct pwm_chip *chip)
283 static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
287 return ERR_PTR(-ENODEV);
290 static inline struct pwm_device *pwm_get(struct device *dev,
291 const char *consumer)
293 return ERR_PTR(-ENODEV);
296 static inline struct pwm_device *of_pwm_get(struct device_node *np,
299 return ERR_PTR(-ENODEV);
302 static inline void pwm_put(struct pwm_device *pwm)
306 static inline struct pwm_device *devm_pwm_get(struct device *dev,
307 const char *consumer)
309 return ERR_PTR(-ENODEV);
312 static inline struct pwm_device *devm_of_pwm_get(struct device *dev,
313 struct device_node *np,
316 return ERR_PTR(-ENODEV);
319 static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
323 static inline bool pwm_can_sleep(struct pwm_device *pwm)
330 struct list_head list;
331 const char *provider;
336 enum pwm_polarity polarity;
339 #define PWM_LOOKUP(_provider, _index, _dev_id, _con_id, _period, _polarity) \
341 .provider = _provider, \
346 .polarity = _polarity \
349 #if IS_ENABLED(CONFIG_PWM)
350 void pwm_add_table(struct pwm_lookup *table, size_t num);
351 void pwm_remove_table(struct pwm_lookup *table, size_t num);
353 static inline void pwm_add_table(struct pwm_lookup *table, size_t num)
357 static inline void pwm_remove_table(struct pwm_lookup *table, size_t num)
362 #ifdef CONFIG_PWM_SYSFS
363 void pwmchip_sysfs_export(struct pwm_chip *chip);
364 void pwmchip_sysfs_unexport(struct pwm_chip *chip);
365 void pwmchip_sysfs_unexport_children(struct pwm_chip *chip);
367 static inline void pwmchip_sysfs_export(struct pwm_chip *chip)
371 static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip)
375 static inline void pwmchip_sysfs_unexport_children(struct pwm_chip *chip)
378 #endif /* CONFIG_PWM_SYSFS */
380 #endif /* __LINUX_PWM_H */