pwm: Delete deprecated functions pwm_request() and pwm_free()

Since commit 5a7fbe4 ("backlight: pwm_bl: Drop support for legacy PWM
probing") the last user of pwm_request() and pwm_free() is gone. So remove
these functions that were deprecated over 10 years ago in commit
8138d2d ("pwm: Add table-based lookup for static mappings").

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
[thierry.reding@gmail.com: clean up a bit after removal]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

Author: Uwe Kleine-König

Documentation/driver-api/pwm.rst

@@ -35,12 +35,9 @@ consumers to providers, as given in the following example::
 Using PWMs
 ----------
 
-Legacy users can request a PWM device using pwm_request() and free it
-after usage with pwm_free().
-
-New users should use the pwm_get() function and pass to it the consumer
-device or a consumer name. pwm_put() is used to free the PWM device. Managed
-variants of the getter, devm_pwm_get() and devm_fwnode_pwm_get(), also exist.
+Consumers use the pwm_get() function and pass to it the consumer device or a
+consumer name. pwm_put() is used to free the PWM device. Managed variants of
+the getter, devm_pwm_get() and devm_fwnode_pwm_get(), also exist.
 
 After being requested, a PWM has to be configured using::
 
@@ -165,8 +162,8 @@ consumers should implement it as described in the "Using PWMs" section.
 Locking
 -------
 
-The PWM core list manipulations are protected by a mutex, so pwm_request()
-and pwm_free() may not be called from an atomic context. Currently the
+The PWM core list manipulations are protected by a mutex, so pwm_get()
+and pwm_put() may not be called from an atomic context. Currently the
 PWM core does not enforce any locking to pwm_enable(), pwm_disable() and
 pwm_config(), so the calling context is currently driver specific. This
 is an issue derived from the former barebone API and should be fixed soon.

drivers/pwm/core.c

@@ -35,11 +35,6 @@ static LIST_HEAD(pwm_chips);
 static DECLARE_BITMAP(allocated_pwms, MAX_PWMS);
 static RADIX_TREE(pwm_tree, GFP_KERNEL);
 
-static struct pwm_device *pwm_to_device(unsigned int pwm)
-{
-	return radix_tree_lookup(&pwm_tree, pwm);
-}
-
 /* Called with pwm_lock held */
 static int alloc_pwms(unsigned int count)
 {
@@ -369,43 +364,6 @@ int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip)
 }
 EXPORT_SYMBOL_GPL(devm_pwmchip_add);
 
-/**
- * pwm_request() - request a PWM device
- * @pwm: global PWM device index
- * @label: PWM device label
- *
- * This function is deprecated, use pwm_get() instead.
- *
- * Returns: A pointer to a PWM device or an ERR_PTR()-encoded error code on
- * failure.
- */
-struct pwm_device *pwm_request(int pwm, const char *label)
-{
-	struct pwm_device *dev;
-	int err;
-
-	if (pwm < 0 || pwm >= MAX_PWMS)
-		return ERR_PTR(-EINVAL);
-
-	mutex_lock(&pwm_lock);
-
-	dev = pwm_to_device(pwm);
-	if (!dev) {
-		dev = ERR_PTR(-EPROBE_DEFER);
-		goto out;
-	}
-
-	err = pwm_device_request(dev, label);
-	if (err < 0)
-		dev = ERR_PTR(err);
-
-out:
-	mutex_unlock(&pwm_lock);
-
-	return dev;
-}
-EXPORT_SYMBOL_GPL(pwm_request);
-
 /**
  * pwm_request_from_chip() - request a PWM device relative to a PWM chip
  * @chip: PWM chip
@@ -438,18 +396,6 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
 }
 EXPORT_SYMBOL_GPL(pwm_request_from_chip);
 
-/**
- * pwm_free() - free a PWM device
- * @pwm: PWM device
- *
- * This function is deprecated, use pwm_put() instead.
- */
-void pwm_free(struct pwm_device *pwm)
-{
-	pwm_put(pwm);
-}
-EXPORT_SYMBOL_GPL(pwm_free);
-
 static void pwm_apply_state_debug(struct pwm_device *pwm,
 				  const struct pwm_state *state)
 {
@@ -790,7 +736,7 @@ static struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np,
 	dl = pwm_device_link_add(dev, pwm);
 	if (IS_ERR(dl)) {
 		/* of_xlate ended up calling pwm_request_from_chip() */
-		pwm_free(pwm);
+		pwm_put(pwm);
 		pwm = ERR_CAST(dl);
 		goto put;
 	}
@@ -1014,7 +960,7 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id)
 
 	dl = pwm_device_link_add(dev, pwm);
 	if (IS_ERR(dl)) {
-		pwm_free(pwm);
+		pwm_put(pwm);
 		return ERR_CAST(dl);
 	}
 

include/linux/pwm.h

@@ -309,8 +309,6 @@ struct pwm_chip {
 
 #if IS_ENABLED(CONFIG_PWM)
 /* PWM user APIs */
-struct pwm_device *pwm_request(int pwm_id, const char *label);
-void pwm_free(struct pwm_device *pwm);
 int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state);
 int pwm_adjust_config(struct pwm_device *pwm);
 
@@ -410,17 +408,6 @@ struct pwm_device *devm_fwnode_pwm_get(struct device *dev,
 				       struct fwnode_handle *fwnode,
 				       const char *con_id);
 #else
-static inline struct pwm_device *pwm_request(int pwm_id, const char *label)
-{
-	might_sleep();
-	return ERR_PTR(-ENODEV);
-}
-
-static inline void pwm_free(struct pwm_device *pwm)
-{
-	might_sleep();
-}
-
 static inline int pwm_apply_state(struct pwm_device *pwm,
 				  const struct pwm_state *state)
 {