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()
106 static ssize_t enable_show(struct device *child,  in enable_show()  argument
110 	const struct pwm_device *pwm = child_to_pwm_device(child);  in enable_show()
118 static ssize_t enable_store(struct device *child,  in enable_store()  argument
122 	struct pwm_export *export = child_to_pwm_export(child);  in enable_store()
123 	struct pwm_device *pwm = export->pwm;  in enable_store()
131 	mutex_lock(&export->lock);  in enable_store()
143 		ret = -EINVAL;  in enable_store()
150 	mutex_unlock(&export->lock);  in enable_store()
154 static ssize_t polarity_show(struct device *child,  in polarity_show()  argument
158 	const struct pwm_device *pwm = child_to_pwm_device(child);  in polarity_show()
177 static ssize_t polarity_store(struct device *child,  in polarity_store()  argument
181 	struct pwm_export *export = child_to_pwm_export(child);  in polarity_store()
182 	struct pwm_device *pwm = export->pwm;  in polarity_store()
192 		return -EINVAL;  in polarity_store()
194 	mutex_lock(&export->lock);  in polarity_store()
198 	mutex_unlock(&export->lock);  in polarity_store()
203 static ssize_t capture_show(struct device *child,  in capture_show()  argument
207 	struct pwm_device *pwm = child_to_pwm_device(child);  in capture_show()
234 static void pwm_export_release(struct device *child)  in pwm_export_release()  argument
236 	struct pwm_export *export = child_to_pwm_export(child);  in pwm_export_release()
241 static int pwm_export_child(struct device *parent, struct pwm_device *pwm)  in pwm_export_child()  argument
247 	if (test_and_set_bit(PWMF_EXPORTED, &pwm->flags))  in pwm_export_child()
248 		return -EBUSY;  in pwm_export_child()
252 		clear_bit(PWMF_EXPORTED, &pwm->flags);  in pwm_export_child()
253 		return -ENOMEM;  in pwm_export_child()
256 	export->pwm = pwm;  in pwm_export_child()
257 	mutex_init(&export->lock);  in pwm_export_child()
259 	export->child.release = pwm_export_release;  in pwm_export_child()
260 	export->child.parent = parent;  in pwm_export_child()
261 	export->child.devt = MKDEV(0, 0);  in pwm_export_child()
262 	export->child.groups = pwm_groups;  in pwm_export_child()
263 	dev_set_name(&export->child, "pwm%u", pwm->hwpwm);  in pwm_export_child()
265 	ret = device_register(&export->child);  in pwm_export_child()
267 		clear_bit(PWMF_EXPORTED, &pwm->flags);  in pwm_export_child()
268 		put_device(&export->child);  in pwm_export_child()
272 	pwm_prop[0] = kasprintf(GFP_KERNEL, "EXPORT=pwm%u", pwm->hwpwm);  in pwm_export_child()
274 	kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop);  in pwm_export_child()
280 static int pwm_unexport_match(struct device *child, void *data)  in pwm_unexport_match()  argument
282 	return child_to_pwm_device(child) == data;  in pwm_unexport_match()
285 static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm)  in pwm_unexport_child()  argument
287 	struct device *child;  in pwm_unexport_child()  local
290 	if (!test_and_clear_bit(PWMF_EXPORTED, &pwm->flags))  in pwm_unexport_child()
291 		return -ENODEV;  in pwm_unexport_child()
293 	child = device_find_child(parent, pwm, pwm_unexport_match);  in pwm_unexport_child()
294 	if (!child)  in pwm_unexport_child()
295 		return -ENODEV;  in pwm_unexport_child()
297 	pwm_prop[0] = kasprintf(GFP_KERNEL, "UNEXPORT=pwm%u", pwm->hwpwm);  in pwm_unexport_child()
299 	kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop);  in pwm_unexport_child()
303 	put_device(child);  in pwm_unexport_child()
304 	device_unregister(child);  in pwm_unexport_child()
310 static ssize_t export_store(struct device *parent,  in export_store()  argument
314 	struct pwm_chip *chip = dev_get_drvdata(parent);  in export_store()
323 	if (hwpwm >= chip->npwm)  in export_store()
324 		return -ENODEV;  in export_store()
330 	ret = pwm_export_child(parent, pwm);  in export_store()
338 static ssize_t unexport_store(struct device *parent,  in unexport_store()  argument
342 	struct pwm_chip *chip = dev_get_drvdata(parent);  in unexport_store()
350 	if (hwpwm >= chip->npwm)  in unexport_store()
351 		return -ENODEV;  in unexport_store()
353 	ret = pwm_unexport_child(parent, &chip->pwms[hwpwm]);  in unexport_store()
359 static ssize_t npwm_show(struct device *parent, struct device_attribute *attr,  in npwm_show()  argument
362 	const struct pwm_chip *chip = dev_get_drvdata(parent);  in npwm_show()
364 	return sprintf(buf, "%u\n", chip->npwm);  in npwm_show()
376 /* takes export->lock on success */
377 static struct pwm_export *pwm_class_get_state(struct device *parent,  in pwm_class_get_state()  argument
381 	struct device *child;  in pwm_class_get_state()  local
384 	if (!test_bit(PWMF_EXPORTED, &pwm->flags))  in pwm_class_get_state()
387 	child = device_find_child(parent, pwm, pwm_unexport_match);  in pwm_class_get_state()
388 	if (!child)  in pwm_class_get_state()
391 	export = child_to_pwm_export(child);  in pwm_class_get_state()
392 	put_device(child);	/* for device_find_child() */  in pwm_class_get_state()
394 	mutex_lock(&export->lock);  in pwm_class_get_state()
407 	mutex_unlock(&export->lock);  in pwm_class_apply_state()
412 static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)  in pwm_class_resume_npwm()  argument
414 	struct pwm_chip *chip = dev_get_drvdata(parent);  in pwm_class_resume_npwm()
419 		struct pwm_device *pwm = &chip->pwms[i];  in pwm_class_resume_npwm()
423 		export = pwm_class_get_state(parent, pwm, &state);  in pwm_class_resume_npwm()
427 		state.enabled = export->suspend.enabled;  in pwm_class_resume_npwm()
436 static int __maybe_unused pwm_class_suspend(struct device *parent)  in pwm_class_suspend()  argument
438 	struct pwm_chip *chip = dev_get_drvdata(parent);  in pwm_class_suspend()
442 	for (i = 0; i < chip->npwm; i++) {  in pwm_class_suspend()
443 		struct pwm_device *pwm = &chip->pwms[i];  in pwm_class_suspend()
447 		export = pwm_class_get_state(parent, pwm, &state);  in pwm_class_suspend()
451 		export->suspend = state;  in pwm_class_suspend()
459 			pwm_class_resume_npwm(parent, i);  in pwm_class_suspend()
467 static int __maybe_unused pwm_class_resume(struct device *parent)  in pwm_class_resume()  argument
469 	struct pwm_chip *chip = dev_get_drvdata(parent);  in pwm_class_resume()
471 	return pwm_class_resume_npwm(parent, chip->npwm);  in pwm_class_resume()
483 static int pwmchip_sysfs_match(struct device *parent, const void *data)  in pwmchip_sysfs_match()  argument
485 	return dev_get_drvdata(parent) == data;  in pwmchip_sysfs_match()
490 	struct device *parent;  in pwmchip_sysfs_export()  local
496 	parent = device_create(&pwm_class, chip->dev, MKDEV(0, 0), chip,  in pwmchip_sysfs_export()
497 			       "pwmchip%d", chip->base);  in pwmchip_sysfs_export()
498 	if (IS_ERR(parent)) {  in pwmchip_sysfs_export()
499 		dev_warn(chip->dev,  in pwmchip_sysfs_export()
506 	struct device *parent;  in pwmchip_sysfs_unexport()  local
509 	parent = class_find_device(&pwm_class, NULL, chip,  in pwmchip_sysfs_unexport()
511 	if (!parent)  in pwmchip_sysfs_unexport()
514 	for (i = 0; i < chip->npwm; i++) {  in pwmchip_sysfs_unexport()
515 		struct pwm_device *pwm = &chip->pwms[i];  in pwmchip_sysfs_unexport()
517 		if (test_bit(PWMF_EXPORTED, &pwm->flags))  in pwmchip_sysfs_unexport()
518 			pwm_unexport_child(parent, pwm);  in pwmchip_sysfs_unexport()
521 	put_device(parent);  in pwmchip_sysfs_unexport()
522 	device_unregister(parent);  in pwmchip_sysfs_unexport()