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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.c71
1 files changed, 31 insertions, 40 deletions
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index ea31c465566..288789750f9 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -71,21 +71,20 @@ int pinmux_check_ops(struct pinctrl_dev *pctldev)
/**
* pin_request() - request a single pin to be muxed in, typically for GPIO
* @pin: the pin number in the global pin space
- * @function: a functional name to give to this pin, passed to the driver
- * so it knows what function to mux in, e.g. the string "gpioNN"
- * means that you want to mux in the pin for use as GPIO number NN
+ * @owner: a representation of the owner of this pin; typically the device
+ * name that controls its mux function, or the requested GPIO name
* @gpio_range: the range matching the GPIO pin if this is a request for a
* single GPIO pin
*/
static int pin_request(struct pinctrl_dev *pctldev,
- int pin, const char *function,
+ int pin, const char *owner,
struct pinctrl_gpio_range *gpio_range)
{
struct pin_desc *desc;
const struct pinmux_ops *ops = pctldev->desc->pmxops;
int status = -EINVAL;
- dev_dbg(pctldev->dev, "request pin %d for %s\n", pin, function);
+ dev_dbg(pctldev->dev, "request pin %d for %s\n", pin, owner);
desc = pin_desc_get(pctldev, pin);
if (desc == NULL) {
@@ -94,19 +93,14 @@ static int pin_request(struct pinctrl_dev *pctldev,
goto out;
}
- if (!function) {
- dev_err(pctldev->dev, "no function name given\n");
- return -EINVAL;
- }
-
spin_lock(&desc->lock);
- if (desc->mux_function) {
+ if (desc->owner && strcmp(desc->owner, owner)) {
spin_unlock(&desc->lock);
dev_err(pctldev->dev,
"pin already requested\n");
goto out;
}
- desc->mux_function = function;
+ desc->owner = owner;
spin_unlock(&desc->lock);
/* Let each pin increase references to this module */
@@ -136,13 +130,13 @@ static int pin_request(struct pinctrl_dev *pctldev,
out_free_pin:
if (status) {
spin_lock(&desc->lock);
- desc->mux_function = NULL;
+ desc->owner = NULL;
spin_unlock(&desc->lock);
}
out:
if (status)
dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
- pin, function ? : "?", status);
+ pin, owner, status);
return status;
}
@@ -154,8 +148,8 @@ out:
* @gpio_range: the range matching the GPIO pin if this is a request for a
* single GPIO pin
*
- * This function returns a pointer to the function name in use. This is used
- * for callers that dynamically allocate a function name so it can be freed
+ * This function returns a pointer to the previous owner. This is used
+ * for callers that dynamically allocate an owner name so it can be freed
* once the pin is free. This is done for GPIO request functions.
*/
static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
@@ -163,7 +157,7 @@ static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
{
const struct pinmux_ops *ops = pctldev->desc->pmxops;
struct pin_desc *desc;
- const char *func;
+ const char *owner;
desc = pin_desc_get(pctldev, pin);
if (desc == NULL) {
@@ -182,12 +176,12 @@ static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
ops->free(pctldev, pin);
spin_lock(&desc->lock);
- func = desc->mux_function;
- desc->mux_function = NULL;
+ owner = desc->owner;
+ desc->owner = NULL;
spin_unlock(&desc->lock);
module_put(pctldev->owner);
- return func;
+ return owner;
}
/**
@@ -201,19 +195,19 @@ int pinmux_request_gpio(struct pinctrl_dev *pctldev,
unsigned pin, unsigned gpio)
{
char gpiostr[16];
- const char *function;
+ const char *owner;
int ret;
/* Conjure some name stating what chip and pin this is taken by */
snprintf(gpiostr, 15, "%s:%d", range->name, gpio);
- function = kstrdup(gpiostr, GFP_KERNEL);
- if (!function)
+ owner = kstrdup(gpiostr, GFP_KERNEL);
+ if (!owner)
return -EINVAL;
- ret = pin_request(pctldev, pin, function, range);
+ ret = pin_request(pctldev, pin, owner, range);
if (ret < 0)
- kfree(function);
+ kfree(owner);
return ret;
}
@@ -227,10 +221,10 @@ int pinmux_request_gpio(struct pinctrl_dev *pctldev,
void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin,
struct pinctrl_gpio_range *range)
{
- const char *func;
+ const char *owner;
- func = pin_free(pctldev, pin, range);
- kfree(func);
+ owner = pin_free(pctldev, pin, range);
+ kfree(owner);
}
/**
@@ -260,17 +254,15 @@ int pinmux_gpio_direction(struct pinctrl_dev *pctldev,
/**
* acquire_pins() - acquire all the pins for a certain function on a pinmux
* @pctldev: the device to take the pins on
- * @func_selector: the function selector to acquire the pins for
+ * @owner: a representation of the owner of this pin; typically the device
+ * name that controls its mux function
* @group_selector: the group selector containing the pins to acquire
*/
static int acquire_pins(struct pinctrl_dev *pctldev,
- unsigned func_selector,
+ const char *owner,
unsigned group_selector)
{
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
- const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
- const char *func = pmxops->get_function_name(pctldev,
- func_selector);
const unsigned *pins;
unsigned num_pins;
int ret;
@@ -286,11 +278,11 @@ static int acquire_pins(struct pinctrl_dev *pctldev,
/* Try to allocate all pins in this group, one by one */
for (i = 0; i < num_pins; i++) {
- ret = pin_request(pctldev, pins[i], func, NULL);
+ ret = pin_request(pctldev, pins[i], owner, NULL);
if (ret) {
dev_err(pctldev->dev,
- "could not get pin %d for function %s on device %s - conflicting mux mappings?\n",
- pins[i], func ? : "(undefined)",
+ "could not get request pin %d on device %s - conflicting mux mappings?\n",
+ pins[i],
pinctrl_dev_get_name(pctldev));
/* On error release all taken pins */
i--; /* this pin just failed */
@@ -503,7 +495,7 @@ static int pinmux_enable_muxmap(struct pinctrl_dev *pctldev,
if (!grp)
return -ENOMEM;
grp->group_selector = group_selector;
- ret = acquire_pins(pctldev, func_selector, group_selector);
+ ret = acquire_pins(pctldev, devname, group_selector);
if (ret) {
kfree(grp);
return ret;
@@ -630,7 +622,7 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
unsigned i, pin;
seq_puts(s, "Pinmux settings per pin\n");
- seq_puts(s, "Format: pin (name): pinmuxfunction\n");
+ seq_puts(s, "Format: pin (name): owner\n");
/* The pin number can be retrived from the pin controller descriptor */
for (i = 0; i < pctldev->desc->npins; i++) {
@@ -645,8 +637,7 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
seq_printf(s, "pin %d (%s): %s\n", pin,
desc->name ? desc->name : "unnamed",
- desc->mux_function ? desc->mux_function
- : "UNCLAIMED");
+ desc->owner ? desc->owner : "UNCLAIMED");
}
return 0;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-26 09:19:14 +0000