pinctrl: introduce PINCTRL_STATE_DEFAULT, define hogs as that state
This provides a single centralized name for the default state.
Update PIN_MAP_* macros to use this state name, instead of requiring the
user to pass a state name in.
With this change, hog entries in the mapping table are defined as those
with state name PINCTRL_STATE_DEFAULT, i.e. all entries have the same
name. This interacts badly with the nested iteration over mapping table
entries in pinctrl_hog_maps() and pinctrl_hog_map() which would now
attempt to claim each hog mapping table entry multiple times. Replacing
the custom hog code with a simple pinctrl_get()/pinctrl_enable().
Update documentation and mapping tables to use this.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 376cede..f25307b 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -44,18 +44,6 @@
unsigned num_maps;
};
-/**
- * struct pinctrl_hog - a list item to stash control hogs
- * @node: pin control hog list node
- * @map: map entry responsible for this hogging
- * @pmx: the pin control hogged by this item
- */
-struct pinctrl_hog {
- struct list_head node;
- struct pinctrl_map const *map;
- struct pinctrl *p;
-};
-
/* Global list of pin control devices */
static DEFINE_MUTEX(pinctrldev_list_mutex);
static LIST_HEAD(pinctrldev_list);
@@ -702,103 +690,6 @@
return 0;
}
-/* Hog a single map entry and add to the hoglist */
-static int pinctrl_hog_map(struct pinctrl_dev *pctldev,
- struct pinctrl_map const *map)
-{
- struct pinctrl_hog *hog;
- struct pinctrl *p;
- int ret;
-
- hog = kzalloc(sizeof(*hog), GFP_KERNEL);
- if (!hog) {
- dev_err(pctldev->dev, "failed to alloc struct pinctrl_hog\n");
- return -ENOMEM;
- }
-
- p = pinctrl_get_locked(pctldev->dev, map->name);
- if (IS_ERR(p)) {
- kfree(hog);
- dev_err(pctldev->dev,
- "could not get the %s pin control mapping for hogging\n",
- map->name);
- return PTR_ERR(p);
- }
-
- ret = pinctrl_enable(p);
- if (ret) {
- pinctrl_put(p);
- kfree(hog);
- dev_err(pctldev->dev,
- "could not enable the %s pin control mapping for hogging\n",
- map->name);
- return ret;
- }
-
- hog->map = map;
- hog->p = p;
-
- dev_info(pctldev->dev, "hogged map %s, function %s\n", map->name,
- map->function);
- list_add_tail(&hog->node, &pctldev->pinctrl_hogs);
-
- return 0;
-}
-
-/**
- * pinctrl_hog_maps() - hog specific map entries on controller device
- * @pctldev: the pin control device to hog entries on
- *
- * When the pin controllers are registered, there may be some specific pinmux
- * map entries that need to be hogged, i.e. get+enabled until the system shuts
- * down.
- */
-static int pinctrl_hog_maps(struct pinctrl_dev *pctldev)
-{
- struct device *dev = pctldev->dev;
- const char *devname = dev_name(dev);
- int ret;
- struct pinctrl_maps *maps_node;
- int i;
- struct pinctrl_map const *map;
-
- INIT_LIST_HEAD(&pctldev->pinctrl_hogs);
-
- mutex_lock(&pinctrl_maps_mutex);
- for_each_maps(maps_node, i, map) {
- if (!strcmp(map->ctrl_dev_name, devname) &&
- !strcmp(map->dev_name, devname)) {
- /* OK time to hog! */
- ret = pinctrl_hog_map(pctldev, map);
- if (ret) {
- mutex_unlock(&pinctrl_maps_mutex);
- return ret;
- }
- }
- }
- mutex_unlock(&pinctrl_maps_mutex);
-
- return 0;
-}
-
-/**
- * pinctrl_unhog_maps() - unhog specific map entries on controller device
- * @pctldev: the pin control device to unhog entries on
- */
-static void pinctrl_unhog_maps(struct pinctrl_dev *pctldev)
-{
- struct list_head *node, *tmp;
-
- list_for_each_safe(node, tmp, &pctldev->pinctrl_hogs) {
- struct pinctrl_hog *hog =
- list_entry(node, struct pinctrl_hog, node);
- pinctrl_disable(hog->p);
- pinctrl_put(hog->p);
- list_del(node);
- kfree(hog);
- }
-}
-
#ifdef CONFIG_DEBUG_FS
static int pinctrl_pins_show(struct seq_file *s, void *what)
@@ -889,19 +780,6 @@
return 0;
}
-static int pinmux_hogs_show(struct seq_file *s, void *what)
-{
- struct pinctrl_dev *pctldev = s->private;
- struct pinctrl_hog *hog;
-
- seq_puts(s, "Pin control map hogs held by device\n");
-
- list_for_each_entry(hog, &pctldev->pinctrl_hogs, node)
- seq_printf(s, "%s\n", hog->map->name);
-
- return 0;
-}
-
static int pinctrl_devices_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev;
@@ -988,11 +866,6 @@
return single_open(file, pinctrl_gpioranges_show, inode->i_private);
}
-static int pinmux_hogs_open(struct inode *inode, struct file *file)
-{
- return single_open(file, pinmux_hogs_show, inode->i_private);
-}
-
static int pinctrl_devices_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_devices_show, NULL);
@@ -1029,13 +902,6 @@
.release = single_release,
};
-static const struct file_operations pinmux_hogs_ops = {
- .open = pinmux_hogs_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
static const struct file_operations pinctrl_devices_ops = {
.open = pinctrl_devices_open,
.read = seq_read,
@@ -1078,8 +944,6 @@
device_root, pctldev, &pinctrl_groups_ops);
debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
device_root, pctldev, &pinctrl_gpioranges_ops);
- debugfs_create_file("pinmux-hogs", S_IFREG | S_IRUGO,
- device_root, pctldev, &pinmux_hogs_ops);
pinmux_init_device_debugfs(device_root, pctldev);
pinconf_init_device_debugfs(device_root, pctldev);
}
@@ -1188,7 +1052,9 @@
mutex_lock(&pinctrldev_list_mutex);
list_add_tail(&pctldev->node, &pinctrldev_list);
mutex_unlock(&pinctrldev_list_mutex);
- pinctrl_hog_maps(pctldev);
+ pctldev->p = pinctrl_get(pctldev->dev, PINCTRL_STATE_DEFAULT);
+ if (!IS_ERR(pctldev->p))
+ pinctrl_enable(pctldev->p);
pinctrl_init_device_debugfs(pctldev);
return pctldev;
@@ -1211,7 +1077,10 @@
return;
pinctrl_remove_device_debugfs(pctldev);
- pinctrl_unhog_maps(pctldev);
+ if (!IS_ERR(pctldev->p)) {
+ pinctrl_disable(pctldev->p);
+ pinctrl_put(pctldev->p);
+ }
/* TODO: check that no pinmuxes are still active? */
mutex_lock(&pinctrldev_list_mutex);
list_del(&pctldev->node);