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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/include/linux/pwm.h
....@@ -5,6 +5,7 @@
55 #include <linux/err.h>
66 #include <linux/mutex.h>
77 #include <linux/of.h>
8
+#include <linux/android_kabi.h>
89 
910 struct pwm_capture;
1011 struct seq_file;
....@@ -59,18 +60,6 @@
5960 	PWM_OUTPUT_MODULATED = 1 << 1,
6061 };
6162 
62
-/**
63
- * struct pwm_output_pattern - PWM duty pattern for MODULATED duty type
64
- * @duty_pattern: PWM duty cycles in the pattern for duty modulation
65
- * @num_entries: number of entries in the pattern
66
- * @cycles_per_duty: number of PWM period cycles an entry stays at
67
- */
68
-struct pwm_output_pattern {
69
-	u64 *duty_pattern;
70
-	unsigned int num_entries;
71
-	u64 cycles_per_duty;
72
-};
73
-
7463 /*
7564  * struct pwm_state - state of a PWM channel
7665  * @period: PWM period (in nanoseconds)
....@@ -83,7 +72,6 @@
8372 	u64 duty_cycle;
8473 	enum pwm_polarity polarity;
8574 	enum pwm_output_type output_type;
86
-	struct pwm_output_pattern *output_pattern;
8775 #ifdef CONFIG_PWM_ROCKCHIP_ONESHOT
8876 	u64 oneshot_count;
8977 #endif /* CONFIG_PWM_ROCKCHIP_ONESHOT */
....@@ -99,7 +87,8 @@
9987  * @chip: PWM chip providing this PWM device
10088  * @chip_data: chip-private data associated with the PWM device
10189  * @args: PWM arguments
102
- * @state: curent PWM channel state
90
+ * @state: last applied state
91
+ * @last: last implemented state (for PWM_DEBUG)
10392  */
10493 struct pwm_device {
10594 	const char *label;
....@@ -111,6 +100,9 @@
111100 
112101 	struct pwm_args args;
113102 	struct pwm_state state;
103
+	struct pwm_state last;
104
+
105
+	ANDROID_KABI_RESERVE(1);
114106 };
115107 
116108 /**
....@@ -133,31 +125,13 @@
133125 	return state.enabled;
134126 }
135127 
136
-static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
128
+static inline void pwm_set_period(struct pwm_device *pwm, u64 period)
137129 {
138130 	if (pwm)
139131 		pwm->state.period = period;
140132 }
141133 
142
-static inline void pwm_set_period_extend(struct pwm_device *pwm, u64 period)
143
-{
144
-	if (pwm)
145
-		pwm->state.period = period;
146
-}
147
-
148
-static inline unsigned int pwm_get_period(const struct pwm_device *pwm)
149
-{
150
-	struct pwm_state state;
151
-
152
-	pwm_get_state(pwm, &state);
153
-
154
-	if (state.period > UINT_MAX)
155
-		pr_warn("PWM period %llu is truncated\n", state.period);
156
-
157
-	return (unsigned int)state.period;
158
-}
159
-
160
-static inline u64 pwm_get_period_extend(const struct pwm_device *pwm)
134
+static inline u64 pwm_get_period(const struct pwm_device *pwm)
161135 {
162136 	struct pwm_state state;
163137 
....@@ -172,25 +146,7 @@
172146 		pwm->state.duty_cycle = duty;
173147 }
174148 
175
-static inline void pwm_set_duty_cycle_extend(struct pwm_device *pwm, u64 duty)
176
-{
177
-	if (pwm)
178
-		pwm->state.duty_cycle = duty;
179
-}
180
-
181
-static inline unsigned int pwm_get_duty_cycle(const struct pwm_device *pwm)
182
-{
183
-	struct pwm_state state;
184
-
185
-	pwm_get_state(pwm, &state);
186
-
187
-	if (state.duty_cycle > UINT_MAX)
188
-		pr_warn("PWM duty cycle %llu is truncated\n", state.duty_cycle);
189
-
190
-	return (unsigned int)state.duty_cycle;
191
-}
192
-
193
-static inline u64 pwm_get_duty_cycle_extend(const struct pwm_device *pwm)
149
+static inline u64 pwm_get_duty_cycle(const struct pwm_device *pwm)
194150 {
195151 	struct pwm_state state;
196152 
....@@ -216,16 +172,6 @@
216172 	pwm_get_state(pwm, &state);
217173 
218174 	return state.output_type;
219
-}
220
-
221
-static inline struct pwm_output_pattern *pwm_get_output_pattern(
222
-				struct pwm_device *pwm)
223
-{
224
-	struct pwm_state state;
225
-
226
-	pwm_get_state(pwm, &state);
227
-
228
-	return pwm->state.output_pattern ?: NULL;
229175 }
230176 
231177 static inline void pwm_get_args(const struct pwm_device *pwm,
....@@ -326,79 +272,68 @@
326272  * struct pwm_ops - PWM controller operations
327273  * @request: optional hook for requesting a PWM
328274  * @free: optional hook for freeing a PWM
329
- * @config: configure duty cycles and period length for this PWM
330
- * @config_extend: configure duty cycles and period length for this
331
- *	PWM with u64 data type
332
- * @set_polarity: configure the polarity of this PWM
333275  * @capture: capture and report PWM signal
334
- * @enable: enable PWM output toggling
335
- * @disable: disable PWM output toggling
336
- * @get_output_type_supported: get the supported output type
337
- * @set_output_type: set PWM output type
338
- * @set_output_pattern: set the pattern for the modulated output
339
- * @apply: atomically apply a new PWM config. The state argument
340
- *	   should be adjusted with the real hardware config (if the
341
- *	   approximate the period or duty_cycle value, state should
342
- *	   reflect it)
276
+ * @apply: atomically apply a new PWM config
343277  * @get_state: get the current PWM state. This function is only
344278  *	       called once per PWM device when the PWM chip is
345279  *	       registered.
346
- * @dbg_show: optional routine to show contents in debugfs
280
+ * @get_output_type_supported: get the supported output type of this PWM
347281  * @owner: helps prevent removal of modules exporting active PWMs
282
+ * @config: configure duty cycles and period length for this PWM
283
+ * @set_polarity: configure the polarity of this PWM
284
+ * @enable: enable PWM output toggling
285
+ * @disable: disable PWM output toggling
348286  */
349287 struct pwm_ops {
350288 	int (*request)(struct pwm_chip *chip, struct pwm_device *pwm);
351289 	void (*free)(struct pwm_chip *chip, struct pwm_device *pwm);
352
-	int (*config)(struct pwm_chip *chip, struct pwm_device *pwm,
353
-		      int duty_ns, int period_ns);
354
-	int (*config_extend)(struct pwm_chip *chip, struct pwm_device *pwm,
355
-		      u64 duty_ns, u64 period_ns);
356
-	int (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm,
357
-			    enum pwm_polarity polarity);
358290 	int (*capture)(struct pwm_chip *chip, struct pwm_device *pwm,
359291 		       struct pwm_capture *result, unsigned long timeout);
360
-	int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm);
361
-	void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm);
362
-	int (*get_output_type_supported)(struct pwm_chip *chip,
363
-			struct pwm_device *pwm);
364
-	int (*set_output_type)(struct pwm_chip *chip, struct pwm_device *pwm,
365
-			enum pwm_output_type output_type);
366
-	int (*set_output_pattern)(struct pwm_chip *chip,
367
-			struct pwm_device *pwm,
368
-			struct pwm_output_pattern *output_pattern);
369292 	int (*apply)(struct pwm_chip *chip, struct pwm_device *pwm,
370
-		     struct pwm_state *state);
293
+		     const struct pwm_state *state);
371294 	void (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm,
372295 			  struct pwm_state *state);
373
-#ifdef CONFIG_DEBUG_FS
374
-	void (*dbg_show)(struct pwm_chip *chip, struct seq_file *s);
375
-#endif
296
+	int (*get_output_type_supported)(struct pwm_chip *chip,
297
+			struct pwm_device *pwm);
376298 	struct module *owner;
299
+
300
+	/* Only used by legacy drivers */
301
+	int (*config)(struct pwm_chip *chip, struct pwm_device *pwm,
302
+		      int duty_ns, int period_ns);
303
+	int (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm,
304
+			    enum pwm_polarity polarity);
305
+	int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm);
306
+	void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm);
307
+
308
+	ANDROID_KABI_RESERVE(1);
377309 };
378310 
379311 /**
380312  * struct pwm_chip - abstract a PWM controller
381313  * @dev: device providing the PWMs
382
- * @list: list node for internal use
383314  * @ops: callbacks for this PWM controller
384315  * @base: number of first PWM controlled by this chip
385316  * @npwm: number of PWMs controlled by this chip
386
- * @pwms: array of PWM devices allocated by the framework
387317  * @of_xlate: request a PWM device given a device tree PWM specifier
388318  * @of_pwm_n_cells: number of cells expected in the device tree PWM specifier
319
+ * @list: list node for internal use
320
+ * @pwms: array of PWM devices allocated by the framework
389321  */
390322 struct pwm_chip {
391323 	struct device *dev;
392
-	struct list_head list;
393324 	const struct pwm_ops *ops;
394325 	int base;
395326 	unsigned int npwm;
396327 
397
-	struct pwm_device *pwms;
398
-
399328 	struct pwm_device * (*of_xlate)(struct pwm_chip *pc,
400329 					const struct of_phandle_args *args);
401330 	unsigned int of_pwm_n_cells;
331
+
332
+	/* only used internally by the PWM framework */
333
+	struct list_head list;
334
+	struct pwm_device *pwms;
335
+
336
+	ANDROID_KABI_RESERVE(1);
402337 };
403338 
404339 /**
....@@ -407,30 +342,33 @@
407342  * @duty_cycle: duty cycle of the PWM signal (in nanoseconds)
408343  */
409344 struct pwm_capture {
410
-	u64 period;
411
-	u64 duty_cycle;
345
+	unsigned int period;
346
+	unsigned int duty_cycle;
412347 };
413348 
414349 #if IS_ENABLED(CONFIG_PWM)
415350 /* PWM user APIs */
416351 struct pwm_device *pwm_request(int pwm_id, const char *label);
417352 void pwm_free(struct pwm_device *pwm);
418
-int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state);
353
+int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state);
419354 int pwm_adjust_config(struct pwm_device *pwm);
420355 
421356 /**
422
- * pwm_output_type_support()
357
+ * pwm_get_output_type_supported() - obtain output type of a PWM device.
423358  * @pwm: PWM device
424359  *
425
- * Returns:  output types supported by the PWM device
360
+ * Returns:  output type supported by the PWM device
426361  */
427362 static inline int pwm_get_output_type_supported(struct pwm_device *pwm)
428363 {
429
-	if (pwm->chip->ops->get_output_type_supported != NULL)
364
+	if (!pwm)
365
+		return -EINVAL;
366
+
367
+	if (pwm->chip->ops->get_output_type_supported)
430368 		return pwm->chip->ops->get_output_type_supported(pwm->chip,
431
-								 pwm);
432
-	else
433
-		return PWM_OUTPUT_FIXED;
369
+				pwm);
370
+
371
+	return PWM_OUTPUT_FIXED;
434372 }
435373 
436374 /**
....@@ -458,67 +396,6 @@
458396 
459397 	state.duty_cycle = duty_ns;
460398 	state.period = period_ns;
461
-	return pwm_apply_state(pwm, &state);
462
-}
463
-
464
-/**
465
- * pwm_config_extend() - change PWM period and duty length with u64 data type
466
- * @pwm: PWM device
467
- * @duty_ns: "on" time (in nanoseconds)
468
- * @period_ns: duration (in nanoseconds) of one cycle
469
- *
470
- * Returns: 0 on success or a negative error code on failure.
471
- */
472
-static inline int pwm_config_extend(struct pwm_device *pwm, u64 duty_ns,
473
-			     u64 period_ns)
474
-{
475
-	struct pwm_state state;
476
-
477
-	if (!pwm)
478
-		return -EINVAL;
479
-
480
-	pwm_get_state(pwm, &state);
481
-	if (state.duty_cycle == duty_ns && state.period == period_ns)
482
-		return 0;
483
-
484
-	state.duty_cycle = duty_ns;
485
-	state.period = period_ns;
486
-	return pwm_apply_state(pwm, &state);
487
-}
488
-
489
-/**
490
- * pwm_set_polarity() - configure the polarity of a PWM signal
491
- * @pwm: PWM device
492
- * @polarity: new polarity of the PWM signal
493
- *
494
- * Note that the polarity cannot be configured while the PWM device is
495
- * enabled.
496
- *
497
- * Returns: 0 on success or a negative error code on failure.
498
- */
499
-static inline int pwm_set_polarity(struct pwm_device *pwm,
500
-				   enum pwm_polarity polarity)
501
-{
502
-	struct pwm_state state;
503
-
504
-	if (!pwm)
505
-		return -EINVAL;
506
-
507
-	pwm_get_state(pwm, &state);
508
-	if (state.polarity == polarity)
509
-		return 0;
510
-
511
-	/*
512
-	 * Changing the polarity of a running PWM without adjusting the
513
-	 * dutycycle/period value is a bit risky (can introduce glitches).
514
-	 * Return -EBUSY in this case.
515
-	 * Note that this is allowed when using pwm_apply_state() because
516
-	 * the user specifies all the parameters.
517
-	 */
518
-	if (state.enabled)
519
-		return -EBUSY;
520
-
521
-	state.polarity = polarity;
522399 	return pwm_apply_state(pwm, &state);
523400 }
524401 
....@@ -580,12 +457,16 @@
580457 		const struct of_phandle_args *args);
581458 
582459 struct pwm_device *pwm_get(struct device *dev, const char *con_id);
583
-struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id);
460
+struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np,
461
+			      const char *con_id);
584462 void pwm_put(struct pwm_device *pwm);
585463 
586464 struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id);
587465 struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
588466 				   const char *con_id);
467
+struct pwm_device *devm_fwnode_pwm_get(struct device *dev,
468
+				       struct fwnode_handle *fwnode,
469
+				       const char *con_id);
589470 void devm_pwm_put(struct device *dev, struct pwm_device *pwm);
590471 #else
591472 static inline struct pwm_device *pwm_request(int pwm_id, const char *label)
....@@ -608,6 +489,11 @@
608489 	return -ENOTSUPP;
609490 }
610491 
492
+static inline int pwm_get_output_type_supported(struct pwm_device *pwm)
493
+{
494
+	return -EINVAL;
495
+}
496
+
611497 static inline int pwm_config(struct pwm_device *pwm, int duty_ns,
612498 			     int period_ns)
613499 {
....@@ -619,12 +505,6 @@
619505 			      unsigned long timeout)
620506 {
621507 	return -EINVAL;
622
-}
623
-
624
-static inline int pwm_set_polarity(struct pwm_device *pwm,
625
-				   enum pwm_polarity polarity)
626
-{
627
-	return -ENOTSUPP;
628508 }
629509 
630510 static inline int pwm_enable(struct pwm_device *pwm)
....@@ -674,7 +554,8 @@
674554 	return ERR_PTR(-ENODEV);
675555 }
676556 
677
-static inline struct pwm_device *of_pwm_get(struct device_node *np,
557
+static inline struct pwm_device *of_pwm_get(struct device *dev,
558
+					    struct device_node *np,
678559 					    const char *con_id)
679560 {
680561 	return ERR_PTR(-ENODEV);
....@@ -697,6 +578,13 @@
697578 	return ERR_PTR(-ENODEV);
698579 }
699580 
581
+static inline struct pwm_device *
582
+devm_fwnode_pwm_get(struct device *dev, struct fwnode_handle *fwnode,
583
+		    const char *con_id)
584
+{
585
+	return ERR_PTR(-ENODEV);
586
+}
587
+
700588 static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
701589 {
702590 }