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path: root/drivers/pinctrl/pinmux.c
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Diffstat (limited to 'drivers/pinctrl/pinmux.c')
-rw-r--r--drivers/pinctrl/pinmux.c97
1 files changed, 67 insertions, 30 deletions
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 4e62783a573..3d5ac73bd5a 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -33,22 +33,25 @@
int pinmux_check_ops(struct pinctrl_dev *pctldev)
{
const struct pinmux_ops *ops = pctldev->desc->pmxops;
+ unsigned nfuncs;
unsigned selector = 0;
/* Check that we implement required operations */
- if (!ops->list_functions ||
+ if (!ops ||
+ !ops->get_functions_count ||
!ops->get_function_name ||
!ops->get_function_groups ||
- !ops->enable ||
- !ops->disable)
+ !ops->enable) {
+ dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n");
return -EINVAL;
-
+ }
/* Check that all functions registered have names */
- while (ops->list_functions(pctldev, selector) >= 0) {
+ nfuncs = ops->get_functions_count(pctldev);
+ while (selector < nfuncs) {
const char *fname = ops->get_function_name(pctldev,
selector);
if (!fname) {
- pr_err("pinmux ops has no name for function%u\n",
+ dev_err(pctldev->dev, "pinmux ops has no name for function%u\n",
selector);
return -EINVAL;
}
@@ -85,20 +88,23 @@ static int pin_request(struct pinctrl_dev *pctldev,
const struct pinmux_ops *ops = pctldev->desc->pmxops;
int status = -EINVAL;
- dev_dbg(pctldev->dev, "request pin %d for %s\n", pin, owner);
-
desc = pin_desc_get(pctldev, pin);
if (desc == NULL) {
dev_err(pctldev->dev,
- "pin is not registered so it cannot be requested\n");
+ "pin %d is not registered so it cannot be requested\n",
+ pin);
goto out;
}
+ dev_dbg(pctldev->dev, "request pin %d (%s) for %s\n",
+ pin, desc->name, owner);
+
if (gpio_range) {
/* There's no need to support multiple GPIO requests */
if (desc->gpio_owner) {
dev_err(pctldev->dev,
- "pin already requested\n");
+ "pin %s already requested by %s; cannot claim for %s\n",
+ desc->name, desc->gpio_owner, owner);
goto out;
}
@@ -106,7 +112,8 @@ static int pin_request(struct pinctrl_dev *pctldev,
} else {
if (desc->mux_usecount && strcmp(desc->mux_owner, owner)) {
dev_err(pctldev->dev,
- "pin already requested\n");
+ "pin %s already requested by %s; cannot claim for %s\n",
+ desc->name, desc->mux_owner, owner);
goto out;
}
@@ -139,8 +146,7 @@ static int pin_request(struct pinctrl_dev *pctldev,
status = 0;
if (status) {
- dev_err(pctldev->dev, "->request on device %s failed for pin %d\n",
- pctldev->desc->name, pin);
+ dev_err(pctldev->dev, "request() failed for pin %d\n", pin);
module_put(pctldev->owner);
}
@@ -157,7 +163,7 @@ out_free_pin:
out:
if (status)
dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
- pin, owner, status);
+ pin, owner, status);
return status;
}
@@ -287,10 +293,11 @@ static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
const char *function)
{
const struct pinmux_ops *ops = pctldev->desc->pmxops;
+ unsigned nfuncs = ops->get_functions_count(pctldev);
unsigned selector = 0;
/* See if this pctldev has this function */
- while (ops->list_functions(pctldev, selector) >= 0) {
+ while (selector < nfuncs) {
const char *fname = ops->get_function_name(pctldev,
selector);
@@ -319,18 +326,32 @@ int pinmux_map_to_setting(struct pinctrl_map const *map,
const unsigned *pins;
unsigned num_pins;
- setting->data.mux.func =
- pinmux_func_name_to_selector(pctldev, map->data.mux.function);
- if (setting->data.mux.func < 0)
- return setting->data.mux.func;
+ if (!pmxops) {
+ dev_err(pctldev->dev, "does not support mux function\n");
+ return -EINVAL;
+ }
+
+ ret = pinmux_func_name_to_selector(pctldev, map->data.mux.function);
+ if (ret < 0) {
+ dev_err(pctldev->dev, "invalid function %s in map table\n",
+ map->data.mux.function);
+ return ret;
+ }
+ setting->data.mux.func = ret;
ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
&groups, &num_groups);
- if (ret < 0)
+ if (ret < 0) {
+ dev_err(pctldev->dev, "can't query groups for function %s\n",
+ map->data.mux.function);
return ret;
- if (!num_groups)
+ }
+ if (!num_groups) {
+ dev_err(pctldev->dev,
+ "function %s can't be selected on any group\n",
+ map->data.mux.function);
return -EINVAL;
-
+ }
if (map->data.mux.group) {
bool found = false;
group = map->data.mux.group;
@@ -340,15 +361,23 @@ int pinmux_map_to_setting(struct pinctrl_map const *map,
break;
}
}
- if (!found)
+ if (!found) {
+ dev_err(pctldev->dev,
+ "invalid group \"%s\" for function \"%s\"\n",
+ group, map->data.mux.function);
return -EINVAL;
+ }
} else {
group = groups[0];
}
- setting->data.mux.group = pinctrl_get_group_selector(pctldev, group);
- if (setting->data.mux.group < 0)
- return setting->data.mux.group;
+ ret = pinctrl_get_group_selector(pctldev, group);
+ if (ret < 0) {
+ dev_err(pctldev->dev, "invalid group %s in map table\n",
+ map->data.mux.group);
+ return ret;
+ }
+ setting->data.mux.group = ret;
ret = pctlops->get_group_pins(pctldev, setting->data.mux.group, &pins,
&num_pins);
@@ -364,7 +393,7 @@ int pinmux_map_to_setting(struct pinctrl_map const *map,
ret = pin_request(pctldev, pins[i], map->dev_name, NULL);
if (ret) {
dev_err(pctldev->dev,
- "could not get request pin %d on device %s\n",
+ "could not request pin %d on device %s\n",
pins[i], pinctrl_dev_get_name(pctldev));
/* On error release all taken pins */
i--; /* this pin just failed */
@@ -467,7 +496,8 @@ void pinmux_disable_setting(struct pinctrl_setting const *setting)
desc->mux_setting = NULL;
}
- ops->disable(pctldev, setting->data.mux.func, setting->data.mux.group);
+ if (ops->disable)
+ ops->disable(pctldev, setting->data.mux.func, setting->data.mux.group);
}
#ifdef CONFIG_DEBUG_FS
@@ -477,11 +507,15 @@ static int pinmux_functions_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private;
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
+ unsigned nfuncs;
unsigned func_selector = 0;
- mutex_lock(&pinctrl_mutex);
+ if (!pmxops)
+ return 0;
- while (pmxops->list_functions(pctldev, func_selector) >= 0) {
+ mutex_lock(&pinctrl_mutex);
+ nfuncs = pmxops->get_functions_count(pctldev);
+ while (func_selector < nfuncs) {
const char *func = pmxops->get_function_name(pctldev,
func_selector);
const char * const *groups;
@@ -515,6 +549,9 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
unsigned i, pin;
+ if (!pmxops)
+ return 0;
+
seq_puts(s, "Pinmux settings per pin\n");
seq_puts(s, "Format: pin (name): mux_owner gpio_owner hog?\n");
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 14:56:04 +0000