27 	struct device child;  member
32 static struct pwm_export *child_to_pwm_export(struct device *child)  in child_to_pwm_export()  argument
34 	return container_of(child, struct pwm_export, child);  in child_to_pwm_export()
37 static struct pwm_device *child_to_pwm_device(struct device *child)  in child_to_pwm_device()  argument
39 	struct pwm_export *export = child_to_pwm_export(child);  in child_to_pwm_device()
41 	return export->pwm;  in child_to_pwm_device()
44 static ssize_t period_show(struct device *child,  in period_show()  argument
48 	const struct pwm_device *pwm = child_to_pwm_device(child);  in period_show()
56 static ssize_t period_store(struct device *child,  in period_store()  argument
60 	struct pwm_export *export = child_to_pwm_export(child);  in period_store()
61 	struct pwm_device *pwm = export->pwm;  in period_store()
70 	mutex_lock(&export->lock);  in period_store()
74 	mutex_unlock(&export->lock);  in period_store()
79 static ssize_t duty_cycle_show(struct device *child,  in duty_cycle_show()  argument
83 	const struct pwm_device *pwm = child_to_pwm_device(child);  in duty_cycle_show()
91 static ssize_t duty_cycle_store(struct device *child,  in duty_cycle_store()  argument
95 	struct pwm_export *export = child_to_pwm_export(child);  in duty_cycle_store()
96 	struct pwm_device *pwm = export->pwm;  in duty_cycle_store()
105 	mutex_lock(&export->lock);  in duty_cycle_store()
109 	mutex_unlock(&export->lock);  in duty_cycle_store()
114 static ssize_t enable_show(struct device *child,  in enable_show()  argument
118 	const struct pwm_device *pwm = child_to_pwm_device(child);  in enable_show()
126 static ssize_t enable_store(struct device *child,  in enable_store()  argument
130 	struct pwm_export *export = child_to_pwm_export(child);  in enable_store()
131 	struct pwm_device *pwm = export->pwm;  in enable_store()
139 	mutex_lock(&export->lock);  in enable_store()
151 		ret = -EINVAL;  in enable_store()
158 	mutex_unlock(&export->lock);  in enable_store()
162 static ssize_t polarity_show(struct device *child,  in polarity_show()  argument
166 	const struct pwm_device *pwm = child_to_pwm_device(child);  in polarity_show()
185 static ssize_t polarity_store(struct device *child,  in polarity_store()  argument
189 	struct pwm_export *export = child_to_pwm_export(child);  in polarity_store()
190 	struct pwm_device *pwm = export->pwm;  in polarity_store()
200 		return -EINVAL;  in polarity_store()
202 	mutex_lock(&export->lock);  in polarity_store()
206 	mutex_unlock(&export->lock);  in polarity_store()
211 static ssize_t capture_show(struct device *child,  in capture_show()  argument
215 	struct pwm_device *pwm = child_to_pwm_device(child);  in capture_show()
242 static void pwm_export_release(struct device *child)  in pwm_export_release()  argument
244 	struct pwm_export *export = child_to_pwm_export(child);  in pwm_export_release()
249 static int pwm_export_child(struct device *parent, struct pwm_device *pwm)  in pwm_export_child()  argument
254 	if (test_and_set_bit(PWMF_EXPORTED, &pwm->flags))  in pwm_export_child()
255 		return -EBUSY;  in pwm_export_child()
259 		clear_bit(PWMF_EXPORTED, &pwm->flags);  in pwm_export_child()
260 		return -ENOMEM;  in pwm_export_child()
263 	export->pwm = pwm;  in pwm_export_child()
264 	mutex_init(&export->lock);  in pwm_export_child()
266 	export->child.release = pwm_export_release;  in pwm_export_child()
267 	export->child.parent = parent;  in pwm_export_child()
268 	export->child.devt = MKDEV(0, 0);  in pwm_export_child()
269 	export->child.groups = pwm_groups;  in pwm_export_child()
270 	dev_set_name(&export->child, "pwm%u", pwm->hwpwm);  in pwm_export_child()
272 	ret = device_register(&export->child);  in pwm_export_child()
274 		clear_bit(PWMF_EXPORTED, &pwm->flags);  in pwm_export_child()
275 		put_device(&export->child);  in pwm_export_child()
283 static int pwm_unexport_match(struct device *child, void *data)  in pwm_unexport_match()  argument
285 	return child_to_pwm_device(child) == data;  in pwm_unexport_match()
288 static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm)  in pwm_unexport_child()  argument
290 	struct device *child;  in pwm_unexport_child()  local
292 	if (!test_and_clear_bit(PWMF_EXPORTED, &pwm->flags))  in pwm_unexport_child()
293 		return -ENODEV;  in pwm_unexport_child()
295 	child = device_find_child(parent, pwm, pwm_unexport_match);  in pwm_unexport_child()
296 	if (!child)  in pwm_unexport_child()
297 		return -ENODEV;  in pwm_unexport_child()
300 	put_device(child);  in pwm_unexport_child()
301 	device_unregister(child);  in pwm_unexport_child()
307 static ssize_t export_store(struct device *parent,  in export_store()  argument
311 	struct pwm_chip *chip = dev_get_drvdata(parent);  in export_store()
320 	if (hwpwm >= chip->npwm)  in export_store()
321 		return -ENODEV;  in export_store()
327 	ret = pwm_export_child(parent, pwm);  in export_store()
335 static ssize_t unexport_store(struct device *parent,  in unexport_store()  argument
339 	struct pwm_chip *chip = dev_get_drvdata(parent);  in unexport_store()
347 	if (hwpwm >= chip->npwm)  in unexport_store()
348 		return -ENODEV;  in unexport_store()
350 	ret = pwm_unexport_child(parent, &chip->pwms[hwpwm]);  in unexport_store()
356 static ssize_t npwm_show(struct device *parent, struct device_attribute *attr,  in npwm_show()  argument
359 	const struct pwm_chip *chip = dev_get_drvdata(parent);  in npwm_show()
361 	return sprintf(buf, "%u\n", chip->npwm);  in npwm_show()
379 static int pwmchip_sysfs_match(struct device *parent, const void *data)  in pwmchip_sysfs_match()  argument
381 	return dev_get_drvdata(parent) == data;  in pwmchip_sysfs_match()
386 	struct device *parent;  in pwmchip_sysfs_export()  local
392 	parent = device_create(&pwm_class, chip->dev, MKDEV(0, 0), chip,  in pwmchip_sysfs_export()
393 			       "pwmchip%d", chip->base);  in pwmchip_sysfs_export()
394 	if (IS_ERR(parent)) {  in pwmchip_sysfs_export()
395 		dev_warn(chip->dev,  in pwmchip_sysfs_export()
402 	struct device *parent;  in pwmchip_sysfs_unexport()  local
405 	parent = class_find_device(&pwm_class, NULL, chip,  in pwmchip_sysfs_unexport()
407 	if (!parent)  in pwmchip_sysfs_unexport()
410 	for (i = 0; i < chip->npwm; i++) {  in pwmchip_sysfs_unexport()
411 		struct pwm_device *pwm = &chip->pwms[i];  in pwmchip_sysfs_unexport()
413 		if (test_bit(PWMF_EXPORTED, &pwm->flags))  in pwmchip_sysfs_unexport()
414 			pwm_unexport_child(parent, pwm);  in pwmchip_sysfs_unexport()
417 	put_device(parent);  in pwmchip_sysfs_unexport()
418 	device_unregister(parent);  in pwmchip_sysfs_unexport()