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 * @lock: used to serialize accesses to the PWM device where necessary
110 * @period: period of the PWM signal (in nanoseconds)
111 * @duty_cycle: duty cycle of the PWM signal (in nanoseconds)
112 * @polarity: polarity of the PWM signal
113 * @args: PWM arguments
120 struct pwm_chip *chip;
125 unsigned int duty_cycle;
126 enum pwm_polarity polarity;
128 struct pwm_args args;
131 static inline bool pwm_is_enabled(const struct pwm_device *pwm)
133 return test_bit(PWMF_ENABLED, &pwm->flags);
136 static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
139 pwm->period = period;
142 static inline unsigned int pwm_get_period(const struct pwm_device *pwm)
144 return pwm ? pwm->period : 0;
147 static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty)
150 pwm->duty_cycle = duty;
153 static inline unsigned int pwm_get_duty_cycle(const struct pwm_device *pwm)
155 return pwm ? pwm->duty_cycle : 0;
159 * pwm_set_polarity - configure the polarity of a PWM signal
161 int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity);
163 static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm)
165 return pwm ? pwm->polarity : PWM_POLARITY_NORMAL;
168 static inline void pwm_get_args(const struct pwm_device *pwm,
169 struct pwm_args *args)
174 static inline void pwm_apply_args(struct pwm_device *pwm)
176 pwm_set_period(pwm, pwm->args.period);
177 pwm_set_polarity(pwm, pwm->args.polarity);
181 * struct pwm_ops - PWM controller operations
182 * @request: optional hook for requesting a PWM
183 * @free: optional hook for freeing a PWM
184 * @config: configure duty cycles and period length for this PWM
185 * @set_polarity: configure the polarity of this PWM
186 * @enable: enable PWM output toggling
187 * @disable: disable PWM output toggling
188 * @dbg_show: optional routine to show contents in debugfs
189 * @owner: helps prevent removal of modules exporting active PWMs
192 int (*request)(struct pwm_chip *chip, struct pwm_device *pwm);
193 void (*free)(struct pwm_chip *chip, struct pwm_device *pwm);
194 int (*config)(struct pwm_chip *chip, struct pwm_device *pwm,
195 int duty_ns, int period_ns);
196 int (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm,
197 enum pwm_polarity polarity);
198 int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm);
199 void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm);
200 #ifdef CONFIG_DEBUG_FS
201 void (*dbg_show)(struct pwm_chip *chip, struct seq_file *s);
203 struct module *owner;
207 * struct pwm_chip - abstract a PWM controller
208 * @dev: device providing the PWMs
209 * @list: list node for internal use
210 * @ops: callbacks for this PWM controller
211 * @base: number of first PWM controlled by this chip
212 * @npwm: number of PWMs controlled by this chip
213 * @pwms: array of PWM devices allocated by the framework
214 * @of_xlate: request a PWM device given a device tree PWM specifier
215 * @of_pwm_n_cells: number of cells expected in the device tree PWM specifier
216 * @can_sleep: must be true if the .config(), .enable() or .disable()
217 * operations may sleep
221 struct list_head list;
222 const struct pwm_ops *ops;
226 struct pwm_device *pwms;
228 struct pwm_device * (*of_xlate)(struct pwm_chip *pc,
229 const struct of_phandle_args *args);
230 unsigned int of_pwm_n_cells;
234 #if IS_ENABLED(CONFIG_PWM)
235 int pwm_set_chip_data(struct pwm_device *pwm, void *data);
236 void *pwm_get_chip_data(struct pwm_device *pwm);
238 int pwmchip_add_with_polarity(struct pwm_chip *chip,
239 enum pwm_polarity polarity);
240 int pwmchip_add(struct pwm_chip *chip);
241 int pwmchip_remove(struct pwm_chip *chip);
242 struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
246 struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc,
247 const struct of_phandle_args *args);
249 struct pwm_device *pwm_get(struct device *dev, const char *con_id);
250 struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id);
251 void pwm_put(struct pwm_device *pwm);
253 struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id);
254 struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
256 void devm_pwm_put(struct device *dev, struct pwm_device *pwm);
258 bool pwm_can_sleep(struct pwm_device *pwm);
260 static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data)
265 static inline void *pwm_get_chip_data(struct pwm_device *pwm)
270 static inline int pwmchip_add(struct pwm_chip *chip)
275 static inline int pwmchip_add_inversed(struct pwm_chip *chip)
280 static inline int pwmchip_remove(struct pwm_chip *chip)
285 static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
289 return ERR_PTR(-ENODEV);
292 static inline struct pwm_device *pwm_get(struct device *dev,
293 const char *consumer)
295 return ERR_PTR(-ENODEV);
298 static inline struct pwm_device *of_pwm_get(struct device_node *np,
301 return ERR_PTR(-ENODEV);
304 static inline void pwm_put(struct pwm_device *pwm)
308 static inline struct pwm_device *devm_pwm_get(struct device *dev,
309 const char *consumer)
311 return ERR_PTR(-ENODEV);
314 static inline struct pwm_device *devm_of_pwm_get(struct device *dev,
315 struct device_node *np,
318 return ERR_PTR(-ENODEV);
321 static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
325 static inline bool pwm_can_sleep(struct pwm_device *pwm)
332 struct list_head list;
333 const char *provider;
338 enum pwm_polarity polarity;
341 #define PWM_LOOKUP(_provider, _index, _dev_id, _con_id, _period, _polarity) \
343 .provider = _provider, \
348 .polarity = _polarity \
351 #if IS_ENABLED(CONFIG_PWM)
352 void pwm_add_table(struct pwm_lookup *table, size_t num);
353 void pwm_remove_table(struct pwm_lookup *table, size_t num);
355 static inline void pwm_add_table(struct pwm_lookup *table, size_t num)
359 static inline void pwm_remove_table(struct pwm_lookup *table, size_t num)
364 #ifdef CONFIG_PWM_SYSFS
365 void pwmchip_sysfs_export(struct pwm_chip *chip);
366 void pwmchip_sysfs_unexport(struct pwm_chip *chip);
367 void pwmchip_sysfs_unexport_children(struct pwm_chip *chip);
369 static inline void pwmchip_sysfs_export(struct pwm_chip *chip)
373 static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip)
377 static inline void pwmchip_sysfs_unexport_children(struct pwm_chip *chip)
380 #endif /* CONFIG_PWM_SYSFS */
382 #endif /* __LINUX_PWM_H */