summaryrefslogtreecommitdiffstats
path: root/drivers/pinctrl
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/core.c198
-rw-r--r--drivers/pinctrl/core.h10
-rw-r--r--drivers/pinctrl/pinconf.c107
-rw-r--r--drivers/pinctrl/pinmux.c21
4 files changed, 215 insertions, 121 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 6af6d8d117df..aefc3394db91 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -18,11 +18,8 @@
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
-#include <linux/radix-tree.h>
#include <linux/err.h>
#include <linux/list.h>
-#include <linux/mutex.h>
-#include <linux/spinlock.h>
#include <linux/sysfs.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
@@ -44,16 +41,16 @@ struct pinctrl_maps {
unsigned num_maps;
};
-/* Global list of pin control devices */
-static DEFINE_MUTEX(pinctrldev_list_mutex);
+/* Mutex taken by all entry points */
+DEFINE_MUTEX(pinctrl_mutex);
+
+/* Global list of pin control devices (struct pinctrl_dev) */
static LIST_HEAD(pinctrldev_list);
-/* List of pin controller handles */
-static DEFINE_MUTEX(pinctrl_list_mutex);
+/* List of pin controller handles (struct pinctrl) */
static LIST_HEAD(pinctrl_list);
-/* Global pinctrl maps */
-static DEFINE_MUTEX(pinctrl_maps_mutex);
+/* List of pinctrl maps (struct pinctrl_maps) */
static LIST_HEAD(pinctrl_maps);
#define for_each_maps(_maps_node_, _i_, _map_) \
@@ -90,7 +87,6 @@ struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
if (!devname)
return NULL;
- mutex_lock(&pinctrldev_list_mutex);
list_for_each_entry(pctldev, &pinctrldev_list, node) {
if (!strcmp(dev_name(pctldev->dev), devname)) {
/* Matched on device name */
@@ -98,7 +94,6 @@ struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
break;
}
}
- mutex_unlock(&pinctrldev_list_mutex);
return found ? pctldev : NULL;
}
@@ -143,11 +138,11 @@ bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
if (pin < 0)
return false;
+ mutex_lock(&pinctrl_mutex);
pindesc = pin_desc_get(pctldev, pin);
- if (pindesc == NULL)
- return false;
+ mutex_unlock(&pinctrl_mutex);
- return true;
+ return pindesc != NULL;
}
EXPORT_SYMBOL_GPL(pin_is_valid);
@@ -191,8 +186,6 @@ static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
return -ENOMEM;
}
- spin_lock_init(&pindesc->lock);
-
/* Set owner */
pindesc->pctldev = pctldev;
@@ -243,16 +236,13 @@ pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
struct pinctrl_gpio_range *range = NULL;
/* Loop over the ranges */
- mutex_lock(&pctldev->gpio_ranges_lock);
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
/* Check if we're in the valid range */
if (gpio >= range->base &&
gpio < range->base + range->npins) {
- mutex_unlock(&pctldev->gpio_ranges_lock);
return range;
}
}
- mutex_unlock(&pctldev->gpio_ranges_lock);
return NULL;
}
@@ -274,7 +264,6 @@ static int pinctrl_get_device_gpio_range(unsigned gpio,
struct pinctrl_dev *pctldev = NULL;
/* Loop over the pin controllers */
- mutex_lock(&pinctrldev_list_mutex);
list_for_each_entry(pctldev, &pinctrldev_list, node) {
struct pinctrl_gpio_range *range;
@@ -282,11 +271,9 @@ static int pinctrl_get_device_gpio_range(unsigned gpio,
if (range != NULL) {
*outdev = pctldev;
*outrange = range;
- mutex_unlock(&pinctrldev_list_mutex);
return 0;
}
}
- mutex_unlock(&pinctrldev_list_mutex);
return -EINVAL;
}
@@ -302,9 +289,9 @@ static int pinctrl_get_device_gpio_range(unsigned gpio,
void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range)
{
- mutex_lock(&pctldev->gpio_ranges_lock);
+ mutex_lock(&pinctrl_mutex);
list_add_tail(&range->node, &pctldev->gpio_ranges);
- mutex_unlock(&pctldev->gpio_ranges_lock);
+ mutex_unlock(&pinctrl_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
@@ -316,9 +303,9 @@ EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range)
{
- mutex_lock(&pctldev->gpio_ranges_lock);
+ mutex_lock(&pinctrl_mutex);
list_del(&range->node);
- mutex_unlock(&pctldev->gpio_ranges_lock);
+ mutex_unlock(&pinctrl_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
@@ -368,14 +355,21 @@ int pinctrl_request_gpio(unsigned gpio)
int ret;
int pin;
+ mutex_lock(&pinctrl_mutex);
+
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
- if (ret)
+ if (ret) {
+ mutex_unlock(&pinctrl_mutex);
return -EINVAL;
+ }
/* Convert to the pin controllers number space */
pin = gpio - range->base + range->pin_base;
- return pinmux_request_gpio(pctldev, range, pin, gpio);
+ ret = pinmux_request_gpio(pctldev, range, pin, gpio);
+
+ mutex_unlock(&pinctrl_mutex);
+ return ret;
}
EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
@@ -394,14 +388,20 @@ void pinctrl_free_gpio(unsigned gpio)
int ret;
int pin;
+ mutex_lock(&pinctrl_mutex);
+
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
- if (ret)
+ if (ret) {
+ mutex_unlock(&pinctrl_mutex);
return;
+ }
/* Convert to the pin controllers number space */
pin = gpio - range->base + range->pin_base;
- return pinmux_free_gpio(pctldev, pin, range);
+ pinmux_free_gpio(pctldev, pin, range);
+
+ mutex_unlock(&pinctrl_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
@@ -432,7 +432,11 @@ static int pinctrl_gpio_direction(unsigned gpio, bool input)
*/
int pinctrl_gpio_direction_input(unsigned gpio)
{
- return pinctrl_gpio_direction(gpio, true);
+ int ret;
+ mutex_lock(&pinctrl_mutex);
+ ret = pinctrl_gpio_direction(gpio, true);
+ mutex_unlock(&pinctrl_mutex);
+ return ret;
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
@@ -446,7 +450,11 @@ EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
*/
int pinctrl_gpio_direction_output(unsigned gpio)
{
- return pinctrl_gpio_direction(gpio, false);
+ int ret;
+ mutex_lock(&pinctrl_mutex);
+ ret = pinctrl_gpio_direction(gpio, false);
+ mutex_unlock(&pinctrl_mutex);
+ return ret;
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
@@ -479,7 +487,6 @@ static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name)
dev_err(dev, "failed to alloc struct pinctrl\n");
return ERR_PTR(-ENOMEM);
}
- mutex_init(&p->mutex);
pinmux_init_pinctrl_handle(p);
/* Iterate over the pin control maps to locate the right ones */
@@ -531,9 +538,7 @@ static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name)
num_maps, devname, name ? name : "(undefined)");
/* Add the pinmux to the global list */
- mutex_lock(&pinctrl_list_mutex);
list_add_tail(&p->node, &pinctrl_list);
- mutex_unlock(&pinctrl_list_mutex);
return p;
}
@@ -549,74 +554,91 @@ struct pinctrl *pinctrl_get(struct device *dev, const char *name)
{
struct pinctrl *p;
- mutex_lock(&pinctrl_maps_mutex);
+ mutex_lock(&pinctrl_mutex);
p = pinctrl_get_locked(dev, name);
- mutex_unlock(&pinctrl_maps_mutex);
+ mutex_unlock(&pinctrl_mutex);
return p;
}
EXPORT_SYMBOL_GPL(pinctrl_get);
-/**
- * pinctrl_put() - release a previously claimed pin control handle
- * @p: a pin control handle previously claimed by pinctrl_get()
- */
-void pinctrl_put(struct pinctrl *p)
+static void pinctrl_put_locked(struct pinctrl *p)
{
if (p == NULL)
return;
- mutex_lock(&p->mutex);
if (p->usecount)
pr_warn("releasing pin control handle with active users!\n");
/* Free the groups and all acquired pins */
pinmux_put(p);
- mutex_unlock(&p->mutex);
/* Remove from list */
- mutex_lock(&pinctrl_list_mutex);
list_del(&p->node);
- mutex_unlock(&pinctrl_list_mutex);
kfree(p);
}
-EXPORT_SYMBOL_GPL(pinctrl_put);
/**
- * pinctrl_enable() - enable a certain pin controller setting
- * @p: the pin control handle to enable, previously claimed by pinctrl_get()
+ * pinctrl_put() - release a previously claimed pin control handle
+ * @p: a pin control handle previously claimed by pinctrl_get()
*/
-int pinctrl_enable(struct pinctrl *p)
+void pinctrl_put(struct pinctrl *p)
+{
+ mutex_lock(&pinctrl_mutex);
+ pinctrl_put(p);
+ mutex_unlock(&pinctrl_mutex);
+}
+EXPORT_SYMBOL_GPL(pinctrl_put);
+
+static int pinctrl_enable_locked(struct pinctrl *p)
{
int ret = 0;
if (p == NULL)
return -EINVAL;
- mutex_lock(&p->mutex);
+
if (p->usecount++ == 0) {
ret = pinmux_enable(p);
if (ret)
p->usecount--;
}
- mutex_unlock(&p->mutex);
+
return ret;
}
-EXPORT_SYMBOL_GPL(pinctrl_enable);
/**
- * pinctrl_disable() - disable a certain pin control setting
- * @p: the pin control handle to disable, previously claimed by pinctrl_get()
+ * pinctrl_enable() - enable a certain pin controller setting
+ * @p: the pin control handle to enable, previously claimed by pinctrl_get()
*/
-void pinctrl_disable(struct pinctrl *p)
+int pinctrl_enable(struct pinctrl *p)
+{
+ int ret;
+ mutex_lock(&pinctrl_mutex);
+ ret = pinctrl_enable_locked(p);
+ mutex_unlock(&pinctrl_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pinctrl_enable);
+
+static void pinctrl_disable_locked(struct pinctrl *p)
{
if (p == NULL)
return;
- mutex_lock(&p->mutex);
if (--p->usecount == 0) {
pinmux_disable(p);
}
- mutex_unlock(&p->mutex);
+}
+
+/**
+ * pinctrl_disable() - disable a certain pin control setting
+ * @p: the pin control handle to disable, previously claimed by pinctrl_get()
+ */
+void pinctrl_disable(struct pinctrl *p)
+{
+ mutex_lock(&pinctrl_mutex);
+ pinctrl_disable_locked(p);
+ mutex_unlock(&pinctrl_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_disable);
@@ -676,9 +698,9 @@ int pinctrl_register_mappings(struct pinctrl_map const *maps,
return -ENOMEM;
}
- mutex_lock(&pinctrl_maps_mutex);
+ mutex_lock(&pinctrl_mutex);
list_add_tail(&maps_node->node, &pinctrl_maps);
- mutex_unlock(&pinctrl_maps_mutex);
+ mutex_unlock(&pinctrl_mutex);
return 0;
}
@@ -693,6 +715,8 @@ static int pinctrl_pins_show(struct seq_file *s, void *what)
seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
+ mutex_lock(&pinctrl_mutex);
+
/* The pin number can be retrived from the pin controller descriptor */
for (i = 0; i < pctldev->desc->npins; i++) {
struct pin_desc *desc;
@@ -713,6 +737,8 @@ static int pinctrl_pins_show(struct seq_file *s, void *what)
seq_puts(s, "\n");
}
+ mutex_unlock(&pinctrl_mutex);
+
return 0;
}
@@ -726,6 +752,8 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)
if (!ops)
return 0;
+ mutex_lock(&pinctrl_mutex);
+
seq_puts(s, "registered pin groups:\n");
while (ops->list_groups(pctldev, selector) >= 0) {
const unsigned *pins;
@@ -748,6 +776,7 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)
selector++;
}
+ mutex_unlock(&pinctrl_mutex);
return 0;
}
@@ -759,8 +788,9 @@ static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
seq_puts(s, "GPIO ranges handled:\n");
+ mutex_lock(&pinctrl_mutex);
+
/* Loop over the ranges */
- mutex_lock(&pctldev->gpio_ranges_lock);
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
range->id, range->name,
@@ -768,7 +798,8 @@ static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
range->pin_base,
(range->pin_base + range->npins - 1));
}
- mutex_unlock(&pctldev->gpio_ranges_lock);
+
+ mutex_unlock(&pinctrl_mutex);
return 0;
}
@@ -778,7 +809,9 @@ static int pinctrl_devices_show(struct seq_file *s, void *what)
struct pinctrl_dev *pctldev;
seq_puts(s, "name [pinmux] [pinconf]\n");
- mutex_lock(&pinctrldev_list_mutex);
+
+ mutex_lock(&pinctrl_mutex);
+
list_for_each_entry(pctldev, &pinctrldev_list, node) {
seq_printf(s, "%s ", pctldev->desc->name);
if (pctldev->desc->pmxops)
@@ -791,7 +824,8 @@ static int pinctrl_devices_show(struct seq_file *s, void *what)
seq_puts(s, "no");
seq_puts(s, "\n");
}
- mutex_unlock(&pinctrldev_list_mutex);
+
+ mutex_unlock(&pinctrl_mutex);
return 0;
}
@@ -804,7 +838,8 @@ static int pinctrl_maps_show(struct seq_file *s, void *what)
seq_puts(s, "Pinctrl maps:\n");
- mutex_lock(&pinctrl_maps_mutex);
+ mutex_lock(&pinctrl_mutex);
+
for_each_maps(maps_node, i, map) {
seq_printf(s, "%s:\n", map->name);
seq_printf(s, " device: %s\n", map->dev_name);
@@ -813,7 +848,8 @@ static int pinctrl_maps_show(struct seq_file *s, void *what)
seq_printf(s, " group: %s\n", map->group ? map->group :
"(default)");
}
- mutex_unlock(&pinctrl_maps_mutex);
+
+ mutex_unlock(&pinctrl_mutex);
return 0;
}
@@ -823,6 +859,9 @@ static int pinctrl_show(struct seq_file *s, void *what)
struct pinctrl *p;
seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
+
+ mutex_lock(&pinctrl_mutex);
+
list_for_each_entry(p, &pinctrl_list, node) {
struct pinctrl_dev *pctldev = p->pctldev;
@@ -841,6 +880,8 @@ static int pinctrl_show(struct seq_file *s, void *what)
p->dev ? dev_name(p->dev) : "(system)");
}
+ mutex_unlock(&pinctrl_mutex);
+
return 0;
}
@@ -1008,7 +1049,6 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
pctldev->driver_data = driver_data;
INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
INIT_LIST_HEAD(&pctldev->gpio_ranges);
- mutex_init(&pctldev->gpio_ranges_lock);
pctldev->dev = dev;
/* If we're implementing pinmuxing, check the ops for sanity */
@@ -1042,12 +1082,16 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
goto out_err;
}
- mutex_lock(&pinctrldev_list_mutex);
+ mutex_lock(&pinctrl_mutex);
+
list_add_tail(&pctldev->node, &pinctrldev_list);
- mutex_unlock(&pinctrldev_list_mutex);
- pctldev->p = pinctrl_get(pctldev->dev, PINCTRL_STATE_DEFAULT);
+
+ pctldev->p = pinctrl_get_locked(pctldev->dev, PINCTRL_STATE_DEFAULT);
if (!IS_ERR(pctldev->p))
- pinctrl_enable(pctldev->p);
+ pinctrl_enable_locked(pctldev->p);
+
+ mutex_unlock(&pinctrl_mutex);
+
pinctrl_init_device_debugfs(pctldev);
return pctldev;
@@ -1070,18 +1114,22 @@ void pinctrl_unregister(struct pinctrl_dev *pctldev)
return;
pinctrl_remove_device_debugfs(pctldev);
+
+ mutex_lock(&pinctrl_mutex);
+
if (!IS_ERR(pctldev->p)) {
- pinctrl_disable(pctldev->p);
- pinctrl_put(pctldev->p);
+ pinctrl_disable_locked(pctldev->p);
+ pinctrl_put_locked(pctldev->p);
}
+
/* TODO: check that no pinmuxes are still active? */
- mutex_lock(&pinctrldev_list_mutex);
list_del(&pctldev->node);
- mutex_unlock(&pinctrldev_list_mutex);
/* Destroy descriptor tree */
pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
pctldev->desc->npins);
kfree(pctldev);
+
+ mutex_unlock(&pinctrl_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_unregister);
diff --git a/drivers/pinctrl/core.h b/drivers/pinctrl/core.h
index e1dfdb3c144f..8808f25a07d4 100644
--- a/drivers/pinctrl/core.h
+++ b/drivers/pinctrl/core.h
@@ -9,6 +9,8 @@
* License terms: GNU General Public License (GPL) version 2
*/
+#include <linux/mutex.h>
+#include <linux/radix-tree.h>
#include <linux/pinctrl/pinconf.h>
struct pinctrl_gpio_range;
@@ -22,7 +24,6 @@ struct pinctrl_gpio_range;
* this radix tree
* @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
* ranges are added to this list at runtime
- * @gpio_ranges_lock: lock for the GPIO ranges list
* @dev: the device entry for this pin controller
* @owner: module providing the pin controller, used for refcounting
* @driver_data: driver data for drivers registering to the pin controller
@@ -35,7 +36,6 @@ struct pinctrl_dev {
struct pinctrl_desc *desc;
struct radix_tree_root pin_desc_tree;
struct list_head gpio_ranges;
- struct mutex gpio_ranges_lock;
struct device *dev;
struct module *owner;
void *driver_data;
@@ -52,7 +52,6 @@ struct pinctrl_dev {
* @usecount: the number of active users of this pin controller setting, used
* to keep track of nested use cases
* @pctldev: pin control device handling this pin control handle
- * @mutex: a lock for the pin control state holder
* @groups: the group selectors for the pinmux device and
* selector combination handling this pinmux, this is a list that
* will be traversed on all pinmux operations such as
@@ -63,7 +62,6 @@ struct pinctrl {
struct device *dev;
unsigned usecount;
struct pinctrl_dev *pctldev;
- struct mutex mutex;
#ifdef CONFIG_PINMUX
struct list_head groups;
#endif
@@ -75,14 +73,12 @@ struct pinctrl {
* @name: a name for the pin, e.g. the name of the pin/pad/finger on a
* datasheet or such
* @dynamic_name: if the name of this pin was dynamically allocated
- * @lock: a lock to protect the descriptor structure
* @owner: the device holding this pin or NULL of no device has claimed it
*/
struct pin_desc {
struct pinctrl_dev *pctldev;
const char *name;
bool dynamic_name;
- spinlock_t lock;
/* These fields only added when supporting pinmux drivers */
#ifdef CONFIG_PINMUX
const char *owner;
@@ -99,3 +95,5 @@ static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
{
return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
}
+
+extern struct mutex pinctrl_mutex;
diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index 3f018a1cc14b..e0a453790a40 100644
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -64,15 +64,23 @@ int pin_config_get(const char *dev_name, const char *name,
struct pinctrl_dev *pctldev;
int pin;
+ mutex_lock(&pinctrl_mutex);
+
pctldev = get_pinctrl_dev_from_devname(dev_name);
- if (!pctldev)
- return -EINVAL;
+ if (!pctldev) {
+ pin = -EINVAL;
+ goto unlock;
+ }
pin = pin_get_from_name(pctldev, name);
if (pin < 0)
- return pin;
+ goto unlock;
- return pin_config_get_for_pin(pctldev, pin, config);
+ pin = pin_config_get_for_pin(pctldev, pin, config);
+
+unlock:
+ mutex_unlock(&pinctrl_mutex);
+ return pin;
}
EXPORT_SYMBOL(pin_config_get);
@@ -110,17 +118,27 @@ int pin_config_set(const char *dev_name, const char *name,
unsigned long config)
{
struct pinctrl_dev *pctldev;
- int pin;
+ int pin, ret;
+
+ mutex_lock(&pinctrl_mutex);
pctldev = get_pinctrl_dev_from_devname(dev_name);
- if (!pctldev)
- return -EINVAL;
+ if (!pctldev) {
+ ret = -EINVAL;
+ goto unlock;
+ }
pin = pin_get_from_name(pctldev, name);
- if (pin < 0)
- return pin;
+ if (pin < 0) {
+ ret = pin;
+ goto unlock;
+ }
+
+ ret = pin_config_set_for_pin(pctldev, pin, config);
- return pin_config_set_for_pin(pctldev, pin, config);
+unlock:
+ mutex_unlock(&pinctrl_mutex);
+ return ret;
}
EXPORT_SYMBOL(pin_config_set);
@@ -129,25 +147,36 @@ int pin_config_group_get(const char *dev_name, const char *pin_group,
{
struct pinctrl_dev *pctldev;
const struct pinconf_ops *ops;
- int selector;
+ int selector, ret;
+
+ mutex_lock(&pinctrl_mutex);
pctldev = get_pinctrl_dev_from_devname(dev_name);
- if (!pctldev)
- return -EINVAL;
+ if (!pctldev) {
+ ret = -EINVAL;
+ goto unlock;
+ }
ops = pctldev->desc->confops;
if (!ops || !ops->pin_config_group_get) {
dev_err(pctldev->dev, "cannot get configuration for pin "
"group, missing group config get function in "
"driver\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto unlock;
}
selector = pinctrl_get_group_selector(pctldev, pin_group);
- if (selector < 0)
- return selector;
+ if (selector < 0) {
+ ret = selector;
+ goto unlock;
+ }
- return ops->pin_config_group_get(pctldev, selector, config);
+ ret = ops->pin_config_group_get(pctldev, selector, config);
+
+unlock:
+ mutex_unlock(&pinctrl_mutex);
+ return ret;
}
EXPORT_SYMBOL(pin_config_group_get);
@@ -163,27 +192,34 @@ int pin_config_group_set(const char *dev_name, const char *pin_group,
int ret;
int i;
+ mutex_lock(&pinctrl_mutex);
+
pctldev = get_pinctrl_dev_from_devname(dev_name);
- if (!pctldev)
- return -EINVAL;
+ if (!pctldev) {
+ ret = -EINVAL;
+ goto unlock;
+ }
ops = pctldev->desc->confops;
pctlops = pctldev->desc->pctlops;
if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) {
dev_err(pctldev->dev, "cannot configure pin group, missing "
"config function in driver\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto unlock;
}
selector = pinctrl_get_group_selector(pctldev, pin_group);
- if (selector < 0)
- return selector;
+ if (selector < 0) {
+ ret = selector;
+ goto unlock;
+ }
ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins);
if (ret) {
dev_err(pctldev->dev, "cannot configure pin group, error "
"getting pins\n");
- return ret;
+ goto unlock;
}
/*
@@ -197,23 +233,30 @@ int pin_config_group_set(const char *dev_name, const char *pin_group,
* pin-by-pin as well, it returns -EAGAIN.
*/
if (ret != -EAGAIN)
- return ret;
+ goto unlock;
}
/*
* If the controller cannot handle entire groups, we configure each pin
* individually.
*/
- if (!ops->pin_config_set)
- return 0;
+ if (!ops->pin_config_set) {
+ ret = 0;
+ goto unlock;
+ }
for (i = 0; i < num_pins; i++) {
ret = ops->pin_config_set(pctldev, pins[i], config);
if (ret < 0)
- return ret;
+ goto unlock;
}
- return 0;
+ ret = 0;
+
+unlock:
+ mutex_unlock(&pinctrl_mutex);
+
+ return ret;
}
EXPORT_SYMBOL(pin_config_group_set);
@@ -236,6 +279,8 @@ static int pinconf_pins_show(struct seq_file *s, void *what)
seq_puts(s, "Pin config settings per pin\n");
seq_puts(s, "Format: pin (name): pinmux setting array\n");
+ mutex_lock(&pinctrl_mutex);
+
/* The pin number can be retrived from the pin controller descriptor */
for (i = 0; i < pctldev->desc->npins; i++) {
struct pin_desc *desc;
@@ -254,6 +299,8 @@ static int pinconf_pins_show(struct seq_file *s, void *what)
seq_printf(s, "\n");
}
+ mutex_unlock(&pinctrl_mutex);
+
return 0;
}
@@ -280,6 +327,8 @@ static int pinconf_groups_show(struct seq_file *s, void *what)
seq_puts(s, "Pin config settings per pin group\n");
seq_puts(s, "Format: group (name): pinmux setting array\n");
+ mutex_lock(&pinctrl_mutex);
+
while (pctlops->list_groups(pctldev, selector) >= 0) {
const char *gname = pctlops->get_group_name(pctldev, selector);
@@ -290,6 +339,8 @@ static int pinconf_groups_show(struct seq_file *s, void *what)
selector++;
}
+ mutex_unlock(&pinctrl_mutex);
+
return 0;
}
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index f409f161ea1d..7342c26f4246 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -19,8 +19,6 @@
#include <linux/radix-tree.h>
#include <linux/err.h>
#include <linux/list.h>
-#include <linux/mutex.h>
-#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/debugfs.h>
@@ -96,15 +94,12 @@ static int pin_request(struct pinctrl_dev *pctldev,
goto out;
}
- spin_lock(&desc->lock);
if (desc->owner && strcmp(desc->owner, owner)) {
- spin_unlock(&desc->lock);
dev_err(pctldev->dev,
"pin already requested\n");
goto out;
}
desc->owner = owner;
- spin_unlock(&desc->lock);
/* Let each pin increase references to this module */
if (!try_module_get(pctldev->owner)) {
@@ -131,11 +126,8 @@ static int pin_request(struct pinctrl_dev *pctldev,
dev_err(pctldev->dev, "->request on device %s failed for pin %d\n",
pctldev->desc->name, pin);
out_free_pin:
- if (status) {
- spin_lock(&desc->lock);
+ if (status)
desc->owner = NULL;
- spin_unlock(&desc->lock);
- }
out:
if (status)
dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
@@ -178,10 +170,8 @@ static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
else if (ops->free)
ops->free(pctldev, pin);
- spin_lock(&desc->lock);
owner = desc->owner;
desc->owner = NULL;
- spin_unlock(&desc->lock);
module_put(pctldev->owner);
return owner;
@@ -580,6 +570,8 @@ static int pinmux_functions_show(struct seq_file *s, void *what)
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
unsigned func_selector = 0;
+ mutex_lock(&pinctrl_mutex);
+
while (pmxops->list_functions(pctldev, func_selector) >= 0) {
const char *func = pmxops->get_function_name(pctldev,
func_selector);
@@ -600,9 +592,10 @@ static int pinmux_functions_show(struct seq_file *s, void *what)
seq_puts(s, "]\n");
func_selector++;
-
}
+ mutex_unlock(&pinctrl_mutex);
+
return 0;
}
@@ -614,6 +607,8 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
seq_puts(s, "Pinmux settings per pin\n");
seq_puts(s, "Format: pin (name): owner\n");
+ mutex_lock(&pinctrl_mutex);
+
/* The pin number can be retrived from the pin controller descriptor */
for (i = 0; i < pctldev->desc->npins; i++) {
struct pin_desc *desc;
@@ -635,6 +630,8 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
is_hog ? " (HOG)" : "");
}
+ mutex_unlock(&pinctrl_mutex);
+
return 0;
}