1 // SPDX-License-Identifier: GPL-2.0-or-later
18 	struct device child;  member
24 static struct pwm_export *child_to_pwm_export(struct device *child)  in child_to_pwm_export()  argument
26 	return container_of(child, struct pwm_export, child);  in child_to_pwm_export()
29 static struct pwm_device *child_to_pwm_device(struct device *child)  in child_to_pwm_device()  argument
31 	struct pwm_export *export = child_to_pwm_export(child);  in child_to_pwm_device()
33 	return export->pwm;  in child_to_pwm_device()
36 static ssize_t period_show(struct device *child,  in period_show()  argument
40 	const struct pwm_device *pwm = child_to_pwm_device(child);  in period_show()
48 static ssize_t period_store(struct device *child,  in period_store()  argument
52 	struct pwm_export *export = child_to_pwm_export(child);  in period_store()
53 	struct pwm_device *pwm = export->pwm;  in period_store()
62 	mutex_lock(&export->lock);  in period_store()
66 	mutex_unlock(&export->lock);  in period_store()
71 static ssize_t duty_cycle_show(struct device *child,  in duty_cycle_show()  argument
75 	const struct pwm_device *pwm = child_to_pwm_device(child);  in duty_cycle_show()
83 static ssize_t duty_cycle_store(struct device *child,  in duty_cycle_store()  argument
87 	struct pwm_export *export = child_to_pwm_export(child);  in duty_cycle_store()
88 	struct pwm_device *pwm = export->pwm;  in duty_cycle_store()
97 	mutex_lock(&export->lock);  in duty_cycle_store()
101 	mutex_unlock(&export->lock);  in duty_cycle_store()
107 static ssize_t oneshot_count_show(struct device *child,  in oneshot_count_show()  argument
111 	const struct pwm_device *pwm = child_to_pwm_device(child);  in oneshot_count_show()
119 static ssize_t oneshot_count_store(struct device *child,  in oneshot_count_store()  argument
123 	struct pwm_export *export = child_to_pwm_export(child);  in oneshot_count_store()
124 	struct pwm_device *pwm = export->pwm;  in oneshot_count_store()
133 	mutex_lock(&export->lock);  in oneshot_count_store()
137 	mutex_unlock(&export->lock);  in oneshot_count_store()
143 static ssize_t enable_show(struct device *child,  in enable_show()  argument
147 	const struct pwm_device *pwm = child_to_pwm_device(child);  in enable_show()
155 static ssize_t enable_store(struct device *child,  in enable_store()  argument
159 	struct pwm_export *export = child_to_pwm_export(child);  in enable_store()
160 	struct pwm_device *pwm = export->pwm;  in enable_store()
168 	mutex_lock(&export->lock);  in enable_store()
180 		ret = -EINVAL;  in enable_store()
187 	mutex_unlock(&export->lock);  in enable_store()
191 static ssize_t polarity_show(struct device *child,  in polarity_show()  argument
195 	const struct pwm_device *pwm = child_to_pwm_device(child);  in polarity_show()
214 static ssize_t polarity_store(struct device *child,  in polarity_store()  argument
218 	struct pwm_export *export = child_to_pwm_export(child);  in polarity_store()
219 	struct pwm_device *pwm = export->pwm;  in polarity_store()
229 		return -EINVAL;  in polarity_store()
231 	mutex_lock(&export->lock);  in polarity_store()
235 	mutex_unlock(&export->lock);  in polarity_store()
240 static ssize_t capture_show(struct device *child,  in capture_show()  argument
244 	struct pwm_device *pwm = child_to_pwm_device(child);  in capture_show()
255 static ssize_t output_type_show(struct device *child,  in output_type_show()  argument
259 	const struct pwm_device *pwm = child_to_pwm_device(child);  in output_type_show()
302 static void pwm_export_release(struct device *child)  in pwm_export_release()  argument
304 	struct pwm_export *export = child_to_pwm_export(child);  in pwm_export_release()
309 static int pwm_export_child(struct device *parent, struct pwm_device *pwm)  in pwm_export_child()  argument
315 	if (test_and_set_bit(PWMF_EXPORTED, &pwm->flags))  in pwm_export_child()
316 		return -EBUSY;  in pwm_export_child()
320 		clear_bit(PWMF_EXPORTED, &pwm->flags);  in pwm_export_child()
321 		return -ENOMEM;  in pwm_export_child()
324 	export->pwm = pwm;  in pwm_export_child()
325 	mutex_init(&export->lock);  in pwm_export_child()
327 	export->child.release = pwm_export_release;  in pwm_export_child()
328 	export->child.parent = parent;  in pwm_export_child()
329 	export->child.devt = MKDEV(0, 0);  in pwm_export_child()
330 	export->child.groups = pwm_groups;  in pwm_export_child()
331 	dev_set_name(&export->child, "pwm%u", pwm->hwpwm);  in pwm_export_child()
333 	ret = device_register(&export->child);  in pwm_export_child()
335 		clear_bit(PWMF_EXPORTED, &pwm->flags);  in pwm_export_child()
336 		put_device(&export->child);  in pwm_export_child()
340 	pwm_prop[0] = kasprintf(GFP_KERNEL, "EXPORT=pwm%u", pwm->hwpwm);  in pwm_export_child()
342 	kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop);  in pwm_export_child()
348 static int pwm_unexport_match(struct device *child, void *data)  in pwm_unexport_match()  argument
350 	return child_to_pwm_device(child) == data;  in pwm_unexport_match()
353 static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm)  in pwm_unexport_child()  argument
355 	struct device *child;  in pwm_unexport_child()  local
358 	if (!test_and_clear_bit(PWMF_EXPORTED, &pwm->flags))  in pwm_unexport_child()
359 		return -ENODEV;  in pwm_unexport_child()
361 	child = device_find_child(parent, pwm, pwm_unexport_match);  in pwm_unexport_child()
362 	if (!child)  in pwm_unexport_child()
363 		return -ENODEV;  in pwm_unexport_child()
365 	pwm_prop[0] = kasprintf(GFP_KERNEL, "UNEXPORT=pwm%u", pwm->hwpwm);  in pwm_unexport_child()
367 	kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop);  in pwm_unexport_child()
371 	put_device(child);  in pwm_unexport_child()
372 	device_unregister(child);  in pwm_unexport_child()
378 static ssize_t export_store(struct device *parent,  in export_store()  argument
382 	struct pwm_chip *chip = dev_get_drvdata(parent);  in export_store()
391 	if (hwpwm >= chip->npwm)  in export_store()
392 		return -ENODEV;  in export_store()
398 	ret = pwm_export_child(parent, pwm);  in export_store()
406 static ssize_t unexport_store(struct device *parent,  in unexport_store()  argument
410 	struct pwm_chip *chip = dev_get_drvdata(parent);  in unexport_store()
418 	if (hwpwm >= chip->npwm)  in unexport_store()
419 		return -ENODEV;  in unexport_store()
421 	ret = pwm_unexport_child(parent, &chip->pwms[hwpwm]);  in unexport_store()
427 static ssize_t npwm_show(struct device *parent, struct device_attribute *attr,  in npwm_show()  argument
430 	const struct pwm_chip *chip = dev_get_drvdata(parent);  in npwm_show()
432 	return sprintf(buf, "%u\n", chip->npwm);  in npwm_show()
444 /* takes export->lock on success */
445 static struct pwm_export *pwm_class_get_state(struct device *parent,  in pwm_class_get_state()  argument
449 	struct device *child;  in pwm_class_get_state()  local
452 	if (!test_bit(PWMF_EXPORTED, &pwm->flags))  in pwm_class_get_state()
455 	child = device_find_child(parent, pwm, pwm_unexport_match);  in pwm_class_get_state()
456 	if (!child)  in pwm_class_get_state()
459 	export = child_to_pwm_export(child);  in pwm_class_get_state()
460 	put_device(child);	/* for device_find_child() */  in pwm_class_get_state()
462 	mutex_lock(&export->lock);  in pwm_class_get_state()
475 	mutex_unlock(&export->lock);  in pwm_class_apply_state()
480 static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)  in pwm_class_resume_npwm()  argument
482 	struct pwm_chip *chip = dev_get_drvdata(parent);  in pwm_class_resume_npwm()
487 		struct pwm_device *pwm = &chip->pwms[i];  in pwm_class_resume_npwm()
491 		export = pwm_class_get_state(parent, pwm, &state);  in pwm_class_resume_npwm()
495 		state.enabled = export->suspend.enabled;  in pwm_class_resume_npwm()
504 static int __maybe_unused pwm_class_suspend(struct device *parent)  in pwm_class_suspend()  argument
506 	struct pwm_chip *chip = dev_get_drvdata(parent);  in pwm_class_suspend()
510 	for (i = 0; i < chip->npwm; i++) {  in pwm_class_suspend()
511 		struct pwm_device *pwm = &chip->pwms[i];  in pwm_class_suspend()
515 		export = pwm_class_get_state(parent, pwm, &state);  in pwm_class_suspend()
519 		export->suspend = state;  in pwm_class_suspend()
527 			pwm_class_resume_npwm(parent, i);  in pwm_class_suspend()
535 static int __maybe_unused pwm_class_resume(struct device *parent)  in pwm_class_resume()  argument
537 	struct pwm_chip *chip = dev_get_drvdata(parent);  in pwm_class_resume()
539 	return pwm_class_resume_npwm(parent, chip->npwm);  in pwm_class_resume()
551 static int pwmchip_sysfs_match(struct device *parent, const void *data)  in pwmchip_sysfs_match()  argument
553 	return dev_get_drvdata(parent) == data;  in pwmchip_sysfs_match()
558 	struct device *parent;  in pwmchip_sysfs_export()  local
564 	parent = device_create(&pwm_class, chip->dev, MKDEV(0, 0), chip,  in pwmchip_sysfs_export()
565 			       "pwmchip%d", chip->base);  in pwmchip_sysfs_export()
566 	if (IS_ERR(parent)) {  in pwmchip_sysfs_export()
567 		dev_warn(chip->dev,  in pwmchip_sysfs_export()
574 	struct device *parent;  in pwmchip_sysfs_unexport()  local
577 	parent = class_find_device(&pwm_class, NULL, chip,  in pwmchip_sysfs_unexport()
579 	if (!parent)  in pwmchip_sysfs_unexport()
582 	for (i = 0; i < chip->npwm; i++) {  in pwmchip_sysfs_unexport()
583 		struct pwm_device *pwm = &chip->pwms[i];  in pwmchip_sysfs_unexport()
585 		if (test_bit(PWMF_EXPORTED, &pwm->flags))  in pwmchip_sysfs_unexport()
586 			pwm_unexport_child(parent, pwm);  in pwmchip_sysfs_unexport()
589 	put_device(parent);  in pwmchip_sysfs_unexport()
590 	device_unregister(parent);  in pwmchip_sysfs_unexport()