/*
* Core driver for the pin muxing portions of the pin control subsystem
*
- * Copyright (C) 2011 ST-Ericsson SA
+ * Copyright (C) 2011-2012 ST-Ericsson SA
* Written on behalf of Linaro for ST-Ericsson
* Based on bits of regulator core, gpio core and clk core
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*
+ * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
+ *
* License terms: GNU General Public License (GPL) version 2
*/
#define pr_fmt(fmt) "pinmux core: " fmt
#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>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinmux.h>
#include "core.h"
+#include "pinmux.h"
-/* List of pinmuxes */
-static DEFINE_MUTEX(pinmux_list_mutex);
-static LIST_HEAD(pinmux_list);
+int pinmux_check_ops(struct pinctrl_dev *pctldev)
+{
+ const struct pinmux_ops *ops = pctldev->desc->pmxops;
+ unsigned selector = 0;
-/* Global pinmux maps */
-static struct pinmux_map *pinmux_maps;
-static unsigned pinmux_maps_num;
+ /* Check that we implement required operations */
+ if (!ops->list_functions ||
+ !ops->get_function_name ||
+ !ops->get_function_groups ||
+ !ops->enable ||
+ !ops->disable)
+ return -EINVAL;
-/**
- * struct pinmux_group - group list item for pinmux groups
- * @node: pinmux group list node
- * @group_selector: the group selector for this group
- */
-struct pinmux_group {
- struct list_head node;
- unsigned group_selector;
-};
+ /* Check that all functions registered have names */
+ while (ops->list_functions(pctldev, selector) >= 0) {
+ const char *fname = ops->get_function_name(pctldev,
+ selector);
+ if (!fname) {
+ pr_err("pinmux ops has no name for function%u\n",
+ selector);
+ return -EINVAL;
+ }
+ selector++;
+ }
-/**
- * struct pinmux - per-device pinmux state holder
- * @node: global list node
- * @dev: the device using this pinmux
- * @usecount: the number of active users of this mux setting, used to keep
- * track of nested use cases
- * @pins: an array of discrete physical pins used in this mapping, taken
- * from the global pin enumeration space (copied from pinmux map)
- * @num_pins: the number of pins in this mapping array, i.e. the number of
- * elements in .pins so we can iterate over that array (copied from
- * pinmux map)
- * @pctldev: pin control device handling this pinmux
- * @func_selector: the function selector for the pinmux device handling
- * this pinmux
- * @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
- * get/put/enable/disable
- * @mutex: a lock for the pinmux state holder
- */
-struct pinmux {
- struct list_head node;
- struct device *dev;
- unsigned usecount;
- struct pinctrl_dev *pctldev;
- unsigned func_selector;
- struct list_head groups;
- struct mutex mutex;
-};
+ return 0;
+}
-/**
- * struct pinmux_hog - a list item to stash mux hogs
- * @node: pinmux hog list node
- * @map: map entry responsible for this hogging
- * @pmx: the pinmux hogged by this item
- */
-struct pinmux_hog {
- struct list_head node;
- struct pinmux_map const *map;
- struct pinmux *pmx;
-};
+int pinmux_validate_map(struct pinctrl_map const *map, int i)
+{
+ if (!map->data.mux.function) {
+ pr_err("failed to register map %s (%d): no function given\n",
+ map->name, i);
+ return -EINVAL;
+ }
+
+ return 0;
+}
/**
* 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) {
goto out;
}
- if (!function) {
- dev_err(pctldev->dev, "no function name given\n");
- return -EINVAL;
- }
-
- spin_lock(&desc->lock);
- if (desc->mux_function) {
- spin_unlock(&desc->lock);
+ if (desc->usecount && strcmp(desc->owner, owner)) {
dev_err(pctldev->dev,
"pin already requested\n");
goto out;
}
- desc->mux_function = function;
- spin_unlock(&desc->lock);
+
+ desc->usecount++;
+ if (desc->usecount > 1)
+ return 0;
+
+ desc->owner = owner;
/* Let each pin increase references to this module */
if (!try_module_get(pctldev->owner)) {
else
status = 0;
- if (status)
- dev_err(pctldev->dev, "->request on device %s failed "
- "for pin %d\n",
+ if (status) {
+ dev_err(pctldev->dev, "->request on device %s failed for pin %d\n",
pctldev->desc->name, pin);
+ module_put(pctldev->owner);
+ }
+
out_free_pin:
if (status) {
- spin_lock(&desc->lock);
- desc->mux_function = NULL;
- spin_unlock(&desc->lock);
+ desc->usecount--;
+ if (!desc->usecount)
+ desc->owner = NULL;
}
out:
if (status)
dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
- pin, function ? : "?", status);
+ pin, owner, status);
return status;
}
* @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,
{
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) {
return NULL;
}
+ desc->usecount--;
+ if (desc->usecount)
+ return NULL;
+
/*
* If there is no kind of request function for the pin we just assume
* we got it by default and proceed.
else if (ops->free)
ops->free(pctldev, pin);
- spin_lock(&desc->lock);
- func = desc->mux_function;
- desc->mux_function = NULL;
- spin_unlock(&desc->lock);
+ owner = desc->owner;
+ desc->owner = NULL;
module_put(pctldev->owner);
- return func;
+ return owner;
}
/**
- * pinmux_request_gpio() - request a single pin to be muxed in as GPIO
- * @gpio: the GPIO pin number from the GPIO subsystem number space
- *
- * This function should *ONLY* be used from gpiolib-based GPIO drivers,
- * as part of their gpio_request() semantics, platforms and individual drivers
- * shall *NOT* request GPIO pins to be muxed in.
+ * pinmux_request_gpio() - request pinmuxing for a GPIO pin
+ * @pctldev: pin controller device affected
+ * @pin: the pin to mux in for GPIO
+ * @range: the applicable GPIO range
*/
-int pinmux_request_gpio(unsigned gpio)
+int pinmux_request_gpio(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned pin, unsigned gpio)
{
char gpiostr[16];
- const char *function;
- struct pinctrl_dev *pctldev;
- struct pinctrl_gpio_range *range;
+ const char *owner;
int ret;
- int pin;
-
- ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
- if (ret)
- return -EINVAL;
-
- /* Convert to the pin controllers number space */
- pin = gpio - range->base + range->pin_base;
/* 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;
}
-EXPORT_SYMBOL_GPL(pinmux_request_gpio);
/**
- * pinmux_free_gpio() - free a single pin, currently used as GPIO
- * @gpio: the GPIO pin number from the GPIO subsystem number space
- *
- * This function should *ONLY* be used from gpiolib-based GPIO drivers,
- * as part of their gpio_free() semantics, platforms and individual drivers
- * shall *NOT* request GPIO pins to be muxed out.
+ * pinmux_free_gpio() - release a pin from GPIO muxing
+ * @pctldev: the pin controller device for the pin
+ * @pin: the affected currently GPIO-muxed in pin
+ * @range: applicable GPIO range
*/
-void pinmux_free_gpio(unsigned gpio)
+void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin,
+ struct pinctrl_gpio_range *range)
{
- struct pinctrl_dev *pctldev;
- struct pinctrl_gpio_range *range;
- int ret;
- int pin;
- const char *func;
+ const char *owner;
- ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
- if (ret)
- return;
-
- /* Convert to the pin controllers number space */
- pin = gpio - range->base + range->pin_base;
-
- func = pin_free(pctldev, pin, range);
- kfree(func);
+ owner = pin_free(pctldev, pin, range);
+ kfree(owner);
}
-EXPORT_SYMBOL_GPL(pinmux_free_gpio);
-static int pinmux_gpio_direction(unsigned gpio, bool input)
+/**
+ * pinmux_gpio_direction() - set the direction of a single muxed-in GPIO pin
+ * @pctldev: the pin controller handling this pin
+ * @range: applicable GPIO range
+ * @pin: the affected GPIO pin in this controller
+ * @input: true if we set the pin as input, false for output
+ */
+int pinmux_gpio_direction(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned pin, bool input)
{
- struct pinctrl_dev *pctldev;
- struct pinctrl_gpio_range *range;
const struct pinmux_ops *ops;
int ret;
- int pin;
-
- ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
- if (ret)
- return ret;
ops = pctldev->desc->pmxops;
- /* Convert to the pin controllers number space */
- pin = gpio - range->base + range->pin_base;
-
if (ops->gpio_set_direction)
ret = ops->gpio_set_direction(pctldev, range, pin, input);
else
return ret;
}
-/**
- * pinmux_gpio_direction_input() - request a GPIO pin to go into input mode
- * @gpio: the GPIO pin number from the GPIO subsystem number space
- *
- * This function should *ONLY* be used from gpiolib-based GPIO drivers,
- * as part of their gpio_direction_input() semantics, platforms and individual
- * drivers shall *NOT* touch pinmux GPIO calls.
- */
-int pinmux_gpio_direction_input(unsigned gpio)
-{
- return pinmux_gpio_direction(gpio, true);
-}
-EXPORT_SYMBOL_GPL(pinmux_gpio_direction_input);
-
-/**
- * pinmux_gpio_direction_output() - request a GPIO pin to go into output mode
- * @gpio: the GPIO pin number from the GPIO subsystem number space
- *
- * This function should *ONLY* be used from gpiolib-based GPIO drivers,
- * as part of their gpio_direction_output() semantics, platforms and individual
- * drivers shall *NOT* touch pinmux GPIO calls.
- */
-int pinmux_gpio_direction_output(unsigned gpio)
-{
- return pinmux_gpio_direction(gpio, false);
-}
-EXPORT_SYMBOL_GPL(pinmux_gpio_direction_output);
-
-/**
- * pinmux_register_mappings() - register a set of pinmux mappings
- * @maps: the pinmux mappings table to register, this should be marked with
- * __initdata so it can be discarded after boot, this function will
- * perform a shallow copy for the mapping entries.
- * @num_maps: the number of maps in the mapping table
- *
- * Only call this once during initialization of your machine, the function is
- * tagged as __init and won't be callable after init has completed. The map
- * passed into this function will be owned by the pinmux core and cannot be
- * freed.
- */
-int __init pinmux_register_mappings(struct pinmux_map const *maps,
- unsigned num_maps)
-{
- void *tmp_maps;
- int i;
-
- pr_debug("add %d pinmux maps\n", num_maps);
-
- /* First sanity check the new mapping */
- for (i = 0; i < num_maps; i++) {
- if (!maps[i].name) {
- pr_err("failed to register map %d: "
- "no map name given\n", i);
- return -EINVAL;
- }
-
- if (!maps[i].ctrl_dev && !maps[i].ctrl_dev_name) {
- pr_err("failed to register map %s (%d): "
- "no pin control device given\n",
- maps[i].name, i);
- return -EINVAL;
- }
-
- if (!maps[i].function) {
- pr_err("failed to register map %s (%d): "
- "no function ID given\n", maps[i].name, i);
- return -EINVAL;
- }
-
- if (!maps[i].dev && !maps[i].dev_name)
- pr_debug("add system map %s function %s with no device\n",
- maps[i].name,
- maps[i].function);
- else
- pr_debug("register map %s, function %s\n",
- maps[i].name,
- maps[i].function);
- }
-
- /*
- * Make a copy of the map array - string pointers will end up in the
- * kernel const section anyway so these do not need to be deep copied.
- */
- if (!pinmux_maps_num) {
- /* On first call, just copy them */
- tmp_maps = kmemdup(maps,
- sizeof(struct pinmux_map) * num_maps,
- GFP_KERNEL);
- if (!tmp_maps)
- return -ENOMEM;
- } else {
- /* Subsequent calls, reallocate array to new size */
- size_t oldsize = sizeof(struct pinmux_map) * pinmux_maps_num;
- size_t newsize = sizeof(struct pinmux_map) * num_maps;
-
- tmp_maps = krealloc(pinmux_maps, oldsize + newsize, GFP_KERNEL);
- if (!tmp_maps)
- return -ENOMEM;
- memcpy((tmp_maps + oldsize), maps, newsize);
- }
-
- pinmux_maps = tmp_maps;
- pinmux_maps_num += num_maps;
- return 0;
-}
-
-/**
- * acquire_pins() - acquire all the pins for a certain funcion on a pinmux
- * @pctldev: the device to take the pins on
- * @func_selector: the function selector to acquire the pins for
- * @group_selector: the group selector containing the pins to acquire
- */
-static int acquire_pins(struct pinctrl_dev *pctldev,
- unsigned func_selector,
- 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;
- int i;
-
- ret = pctlops->get_group_pins(pctldev, group_selector,
- &pins, &num_pins);
- if (ret)
- return ret;
-
- dev_dbg(pctldev->dev, "requesting the %u pins from group %u\n",
- num_pins, group_selector);
-
- /* 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);
- 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)",
- pinctrl_dev_get_name(pctldev));
- /* On error release all taken pins */
- i--; /* this pin just failed */
- for (; i >= 0; i--)
- pin_free(pctldev, pins[i], NULL);
- return -ENODEV;
- }
- }
- return 0;
-}
-
-/**
- * release_pins() - release pins taken by earlier acquirement
- * @pctldev: the device to free the pinx on
- * @group_selector: the group selector containing the pins to free
- */
-static void release_pins(struct pinctrl_dev *pctldev,
- unsigned group_selector)
-{
- const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
- const unsigned *pins;
- unsigned num_pins;
- int ret;
- int i;
-
- ret = pctlops->get_group_pins(pctldev, group_selector,
- &pins, &num_pins);
- if (ret) {
- dev_err(pctldev->dev, "could not get pins to release for "
- "group selector %d\n",
- group_selector);
- return;
- }
- for (i = 0; i < num_pins; i++)
- pin_free(pctldev, pins[i], NULL);
-}
-
-/**
- * pinmux_check_pin_group() - check function and pin group combo
- * @pctldev: device to check the pin group vs function for
- * @func_selector: the function selector to check the pin group for, we have
- * already looked this up in the calling function
- * @pin_group: the pin group to match to the function
- *
- * This function will check that the pinmux driver can supply the
- * selected pin group for a certain function, returns the group selector if
- * the group and function selector will work fine together, else returns
- * negative
- */
-static int pinmux_check_pin_group(struct pinctrl_dev *pctldev,
- unsigned func_selector,
- const char *pin_group)
-{
- const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
- const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
- int ret;
-
- /*
- * If the driver does not support different pin groups for the
- * functions, we only support group 0, and assume this exists.
- */
- if (!pctlops || !pctlops->list_groups)
- return 0;
-
- /*
- * Passing NULL (no specific group) will select the first and
- * hopefully only group of pins available for this function.
- */
- if (!pin_group) {
- char const * const *groups;
- unsigned num_groups;
-
- ret = pmxops->get_function_groups(pctldev, func_selector,
- &groups, &num_groups);
- if (ret)
- return ret;
- if (num_groups < 1)
- return -EINVAL;
- ret = pinctrl_get_group_selector(pctldev, groups[0]);
- if (ret < 0) {
- dev_err(pctldev->dev,
- "function %s wants group %s but the pin "
- "controller does not seem to have that group\n",
- pmxops->get_function_name(pctldev, func_selector),
- groups[0]);
- return ret;
- }
-
- if (num_groups > 1)
- dev_dbg(pctldev->dev,
- "function %s support more than one group, "
- "default-selecting first group %s (%d)\n",
- pmxops->get_function_name(pctldev, func_selector),
- groups[0],
- ret);
-
- return ret;
- }
-
- dev_dbg(pctldev->dev,
- "check if we have pin group %s on controller %s\n",
- pin_group, pinctrl_dev_get_name(pctldev));
-
- ret = pinctrl_get_group_selector(pctldev, pin_group);
- if (ret < 0) {
- dev_dbg(pctldev->dev,
- "%s does not support pin group %s with function %s\n",
- pinctrl_dev_get_name(pctldev),
- pin_group,
- pmxops->get_function_name(pctldev, func_selector));
- }
- return ret;
-}
-
-/**
- * pinmux_search_function() - check pin control driver for a certain function
- * @pctldev: device to check for function and position
- * @map: function map containing the function and position to look for
- * @func_selector: returns the applicable function selector if found
- * @group_selector: returns the applicable group selector if found
- *
- * This will search the pinmux driver for an applicable
- * function with a specific pin group, returns 0 if these can be mapped
- * negative otherwise
- */
-static int pinmux_search_function(struct pinctrl_dev *pctldev,
- struct pinmux_map const *map,
- unsigned *func_selector,
- unsigned *group_selector)
+static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
+ const char *function)
{
const struct pinmux_ops *ops = pctldev->desc->pmxops;
unsigned selector = 0;
while (ops->list_functions(pctldev, selector) >= 0) {
const char *fname = ops->get_function_name(pctldev,
selector);
- int ret;
-
- if (!strcmp(map->function, fname)) {
- /* Found the function, check pin group */
- ret = pinmux_check_pin_group(pctldev, selector,
- map->group);
- if (ret < 0)
- return ret;
- /* This function and group selector can be used */
- *func_selector = selector;
- *group_selector = ret;
- return 0;
+ if (!strcmp(function, fname))
+ return selector;
- }
selector++;
}
pr_err("%s does not support function %s\n",
- pinctrl_dev_get_name(pctldev), map->function);
+ pinctrl_dev_get_name(pctldev), function);
return -EINVAL;
}
-/**
- * pinmux_enable_muxmap() - enable a map entry for a certain pinmux
- */
-static int pinmux_enable_muxmap(struct pinctrl_dev *pctldev,
- struct pinmux *pmx,
- struct device *dev,
- const char *devname,
- struct pinmux_map const *map)
+int pinmux_map_to_setting(struct pinctrl_map const *map,
+ struct pinctrl_setting *setting)
{
- unsigned func_selector;
- unsigned group_selector;
- struct pinmux_group *grp;
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
+ const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
+ char const * const *groups;
+ unsigned num_groups;
int ret;
+ const char *group;
+ int i;
+ const unsigned *pins;
+ unsigned num_pins;
- /*
- * Note that we're not locking the pinmux mutex here, because
- * this is only called at pinmux initialization time when it
- * has not been added to any list and thus is not reachable
- * by anyone else.
- */
-
- if (pmx->pctldev && pmx->pctldev != pctldev) {
- dev_err(pctldev->dev,
- "different pin control devices given for device %s, "
- "function %s\n",
- devname,
- map->function);
- return -EINVAL;
- }
- pmx->dev = dev;
- pmx->pctldev = pctldev;
+ 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;
- /* Now go into the driver and try to match a function and group */
- ret = pinmux_search_function(pctldev, map, &func_selector,
- &group_selector);
+ ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
+ &groups, &num_groups);
if (ret < 0)
return ret;
-
- /*
- * If the function selector is already set, it needs to be identical,
- * we support several groups with one function but not several
- * functions with one or several groups in the same pinmux.
- */
- if (pmx->func_selector != UINT_MAX &&
- pmx->func_selector != func_selector) {
- dev_err(pctldev->dev,
- "dual function defines in the map for device %s\n",
- devname);
+ if (!num_groups)
return -EINVAL;
- }
- pmx->func_selector = func_selector;
-
- /* Now add this group selector, we may have many of them */
- grp = kmalloc(sizeof(struct pinmux_group), GFP_KERNEL);
- if (!grp)
- return -ENOMEM;
- grp->group_selector = group_selector;
- ret = acquire_pins(pctldev, func_selector, group_selector);
- if (ret) {
- kfree(grp);
- return ret;
- }
- list_add(&grp->node, &pmx->groups);
-
- return 0;
-}
-
-static void pinmux_free_groups(struct pinmux *pmx)
-{
- struct list_head *node, *tmp;
-
- list_for_each_safe(node, tmp, &pmx->groups) {
- struct pinmux_group *grp =
- list_entry(node, struct pinmux_group, node);
- /* Release all pins taken by this group */
- release_pins(pmx->pctldev, grp->group_selector);
- list_del(node);
- kfree(grp);
- }
-}
-
-/**
- * pinmux_get() - retrieves the pinmux for a certain device
- * @dev: the device to get the pinmux for
- * @name: an optional specific mux mapping name or NULL, the name is only
- * needed if you want to have more than one mapping per device, or if you
- * need an anonymous pinmux (not tied to any specific device)
- */
-struct pinmux *pinmux_get(struct device *dev, const char *name)
-{
-
- struct pinmux_map const *map = NULL;
- struct pinctrl_dev *pctldev = NULL;
- const char *devname = NULL;
- struct pinmux *pmx;
- bool found_map;
- unsigned num_maps = 0;
- int ret = -ENODEV;
- int i;
-
- /* We must have dev or ID or both */
- if (!dev && !name)
- return ERR_PTR(-EINVAL);
-
- if (dev)
- devname = dev_name(dev);
-
- pr_debug("get mux %s for device %s\n", name,
- devname ? devname : "(none)");
-
- /*
- * create the state cookie holder struct pinmux for each
- * mapping, this is what consumers will get when requesting
- * a pinmux handle with pinmux_get()
- */
- pmx = kzalloc(sizeof(struct pinmux), GFP_KERNEL);
- if (pmx == NULL)
- return ERR_PTR(-ENOMEM);
- mutex_init(&pmx->mutex);
- pmx->func_selector = UINT_MAX;
- INIT_LIST_HEAD(&pmx->groups);
-
- /* Iterate over the pinmux maps to locate the right ones */
- for (i = 0; i < pinmux_maps_num; i++) {
- map = &pinmux_maps[i];
- found_map = false;
-
- /*
- * First, try to find the pctldev given in the map
- */
- pctldev = get_pinctrl_dev_from_dev(map->ctrl_dev,
- map->ctrl_dev_name);
- if (!pctldev) {
- const char *devname = NULL;
-
- if (map->ctrl_dev)
- devname = dev_name(map->ctrl_dev);
- else if (map->ctrl_dev_name)
- devname = map->ctrl_dev_name;
-
- pr_warning("could not find a pinctrl device for pinmux "
- "function %s, fishy, they shall all have one\n",
- map->function);
- pr_warning("given pinctrl device name: %s",
- devname ? devname : "UNDEFINED");
-
- /* Continue to check the other mappings anyway... */
- continue;
- }
-
- pr_debug("in map, found pctldev %s to handle function %s",
- dev_name(pctldev->dev), map->function);
-
-
- /*
- * If we're looking for a specific named map, this must match,
- * else we loop and look for the next.
- */
- if (name != NULL) {
- if (map->name == NULL)
- continue;
- if (strcmp(map->name, name))
- continue;
- }
-
- /*
- * This is for the case where no device name is given, we
- * already know that the function name matches from above
- * code.
- */
- if (!map->dev_name && (name != NULL))
- found_map = true;
-
- /* If the mapping has a device set up it must match */
- if (map->dev_name &&
- (!devname || !strcmp(map->dev_name, devname)))
- /* MATCH! */
- found_map = true;
-
- /* If this map is applicable, then apply it */
- if (found_map) {
- ret = pinmux_enable_muxmap(pctldev, pmx, dev,
- devname, map);
- if (ret) {
- pinmux_free_groups(pmx);
- kfree(pmx);
- return ERR_PTR(ret);
- }
- num_maps++;
- }
- }
-
-
- /* We should have atleast one map, right */
- if (!num_maps) {
- pr_err("could not find any mux maps for device %s, ID %s\n",
- devname ? devname : "(anonymous)",
- name ? name : "(undefined)");
- kfree(pmx);
- return ERR_PTR(-EINVAL);
- }
-
- pr_debug("found %u mux maps for device %s, UD %s\n",
- num_maps,
- devname ? devname : "(anonymous)",
- name ? name : "(undefined)");
- /* Add the pinmux to the global list */
- mutex_lock(&pinmux_list_mutex);
- list_add(&pmx->node, &pinmux_list);
- mutex_unlock(&pinmux_list_mutex);
-
- return pmx;
-}
-EXPORT_SYMBOL_GPL(pinmux_get);
-
-/**
- * pinmux_put() - release a previously claimed pinmux
- * @pmx: a pinmux previously claimed by pinmux_get()
- */
-void pinmux_put(struct pinmux *pmx)
-{
- if (pmx == NULL)
- return;
-
- mutex_lock(&pmx->mutex);
- if (pmx->usecount)
- pr_warn("releasing pinmux with active users!\n");
- /* Free the groups and all acquired pins */
- pinmux_free_groups(pmx);
- mutex_unlock(&pmx->mutex);
-
- /* Remove from list */
- mutex_lock(&pinmux_list_mutex);
- list_del(&pmx->node);
- mutex_unlock(&pinmux_list_mutex);
-
- kfree(pmx);
-}
-EXPORT_SYMBOL_GPL(pinmux_put);
-
-/**
- * pinmux_enable() - enable a certain pinmux setting
- * @pmx: the pinmux to enable, previously claimed by pinmux_get()
- */
-int pinmux_enable(struct pinmux *pmx)
-{
- int ret = 0;
-
- if (pmx == NULL)
- return -EINVAL;
- mutex_lock(&pmx->mutex);
- if (pmx->usecount++ == 0) {
- struct pinctrl_dev *pctldev = pmx->pctldev;
- const struct pinmux_ops *ops = pctldev->desc->pmxops;
- struct pinmux_group *grp;
-
- list_for_each_entry(grp, &pmx->groups, node) {
- ret = ops->enable(pctldev, pmx->func_selector,
- grp->group_selector);
- if (ret) {
- /*
- * TODO: call disable() on all groups we called
- * enable() on to this point?
- */
- pmx->usecount--;
+ if (map->data.mux.group) {
+ bool found = false;
+ group = map->data.mux.group;
+ for (i = 0; i < num_groups; i++) {
+ if (!strcmp(group, groups[i])) {
+ found = true;
break;
}
}
+ if (!found)
+ return -EINVAL;
+ } else {
+ group = groups[0];
}
- mutex_unlock(&pmx->mutex);
- return ret;
-}
-EXPORT_SYMBOL_GPL(pinmux_enable);
-/**
- * pinmux_disable() - disable a certain pinmux setting
- * @pmx: the pinmux to disable, previously claimed by pinmux_get()
- */
-void pinmux_disable(struct pinmux *pmx)
-{
- if (pmx == NULL)
- return;
+ setting->data.mux.group = pinctrl_get_group_selector(pctldev, group);
+ if (setting->data.mux.group < 0)
+ return setting->data.mux.group;
- mutex_lock(&pmx->mutex);
- if (--pmx->usecount == 0) {
- struct pinctrl_dev *pctldev = pmx->pctldev;
- const struct pinmux_ops *ops = pctldev->desc->pmxops;
- struct pinmux_group *grp;
+ ret = pctlops->get_group_pins(pctldev, setting->data.mux.group, &pins,
+ &num_pins);
+ if (ret) {
+ dev_err(pctldev->dev,
+ "could not get pins for device %s group selector %d\n",
+ pinctrl_dev_get_name(pctldev), setting->data.mux.group);
+ return -ENODEV;
+ }
- list_for_each_entry(grp, &pmx->groups, node) {
- ops->disable(pctldev, pmx->func_selector,
- grp->group_selector);
+ /* Try to allocate all pins in this group, one by one */
+ for (i = 0; i < num_pins; i++) {
+ 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",
+ pins[i], pinctrl_dev_get_name(pctldev));
+ /* On error release all taken pins */
+ i--; /* this pin just failed */
+ for (; i >= 0; i--)
+ pin_free(pctldev, pins[i], NULL);
+ return -ENODEV;
}
}
- mutex_unlock(&pmx->mutex);
-}
-EXPORT_SYMBOL_GPL(pinmux_disable);
-
-int pinmux_check_ops(const struct pinmux_ops *ops)
-{
- /* Check that we implement required operations */
- if (!ops->list_functions ||
- !ops->get_function_name ||
- !ops->get_function_groups ||
- !ops->enable ||
- !ops->disable)
- return -EINVAL;
return 0;
}
-/* Hog a single map entry and add to the hoglist */
-static int pinmux_hog_map(struct pinctrl_dev *pctldev,
- struct pinmux_map const *map)
+void pinmux_free_setting(struct pinctrl_setting const *setting)
{
- struct pinmux_hog *hog;
- struct pinmux *pmx;
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
+ const unsigned *pins;
+ unsigned num_pins;
int ret;
+ int i;
- if (map->dev || map->dev_name) {
- /*
- * TODO: the day we have device tree support, we can
- * traverse the device tree and hog to specific device nodes
- * without any problems, so then we can hog pinmuxes for
- * all devices that just want a static pin mux at this point.
- */
- dev_err(pctldev->dev, "map %s wants to hog a non-system "
- "pinmux, this is not going to work\n", map->name);
- return -EINVAL;
- }
-
- hog = kzalloc(sizeof(struct pinmux_hog), GFP_KERNEL);
- if (!hog)
- return -ENOMEM;
-
- pmx = pinmux_get(NULL, map->name);
- if (IS_ERR(pmx)) {
- kfree(hog);
- dev_err(pctldev->dev,
- "could not get the %s pinmux mapping for hogging\n",
- map->name);
- return PTR_ERR(pmx);
- }
-
- ret = pinmux_enable(pmx);
+ ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
+ &pins, &num_pins);
if (ret) {
- pinmux_put(pmx);
- kfree(hog);
dev_err(pctldev->dev,
- "could not enable the %s pinmux mapping for hogging\n",
- map->name);
- return ret;
+ "could not get pins for device %s group selector %d\n",
+ pinctrl_dev_get_name(pctldev), setting->data.mux.group);
+ return;
}
- hog->map = map;
- hog->pmx = pmx;
-
- dev_info(pctldev->dev, "hogged map %s, function %s\n", map->name,
- map->function);
- mutex_lock(&pctldev->pinmux_hogs_lock);
- list_add(&hog->node, &pctldev->pinmux_hogs);
- mutex_unlock(&pctldev->pinmux_hogs_lock);
-
- return 0;
+ for (i = 0; i < num_pins; i++)
+ pin_free(pctldev, pins[i], NULL);
}
-/**
- * pinmux_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.
- */
-int pinmux_hog_maps(struct pinctrl_dev *pctldev)
+int pinmux_enable_setting(struct pinctrl_setting const *setting)
{
- struct device *dev = pctldev->dev;
- const char *devname = dev_name(dev);
- int ret;
- int i;
-
- INIT_LIST_HEAD(&pctldev->pinmux_hogs);
- mutex_init(&pctldev->pinmux_hogs_lock);
-
- for (i = 0; i < pinmux_maps_num; i++) {
- struct pinmux_map const *map = &pinmux_maps[i];
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinmux_ops *ops = pctldev->desc->pmxops;
- if (((map->ctrl_dev == dev) ||
- !strcmp(map->ctrl_dev_name, devname)) &&
- map->hog_on_boot) {
- /* OK time to hog! */
- ret = pinmux_hog_map(pctldev, map);
- if (ret)
- return ret;
- }
- }
- return 0;
+ return ops->enable(pctldev, setting->data.mux.func,
+ setting->data.mux.group);
}
-/**
- * pinmux_unhog_maps() - unhog specific map entries on controller device
- * @pctldev: the pin control device to unhog entries on
- */
-void pinmux_unhog_maps(struct pinctrl_dev *pctldev)
+void pinmux_disable_setting(struct pinctrl_setting const *setting)
{
- struct list_head *node, *tmp;
-
- mutex_lock(&pctldev->pinmux_hogs_lock);
- list_for_each_safe(node, tmp, &pctldev->pinmux_hogs) {
- struct pinmux_hog *hog =
- list_entry(node, struct pinmux_hog, node);
- pinmux_disable(hog->pmx);
- pinmux_put(hog->pmx);
- list_del(node);
- kfree(hog);
- }
- mutex_unlock(&pctldev->pinmux_hogs_lock);
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinmux_ops *ops = pctldev->desc->pmxops;
+
+ ops->disable(pctldev, setting->data.mux.func, setting->data.mux.group);
}
#ifdef CONFIG_DEBUG_FS
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);
seq_puts(s, "]\n");
func_selector++;
-
}
+ mutex_unlock(&pinctrl_mutex);
+
return 0;
}
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");
+
+ 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;
+ bool is_hog = false;
pin = pctldev->desc->pins[i].number;
desc = pin_desc_get(pctldev, pin);
if (desc == NULL)
continue;
- seq_printf(s, "pin %d (%s): %s\n", pin,
+ if (desc->owner &&
+ !strcmp(desc->owner, pinctrl_dev_get_name(pctldev)))
+ is_hog = true;
+
+ seq_printf(s, "pin %d (%s): %s%s\n", pin,
desc->name ? desc->name : "unnamed",
- desc->mux_function ? desc->mux_function
- : "UNCLAIMED");
+ desc->owner ? desc->owner : "UNCLAIMED",
+ is_hog ? " (HOG)" : "");
}
- return 0;
-}
-
-static int pinmux_hogs_show(struct seq_file *s, void *what)
-{
- struct pinctrl_dev *pctldev = s->private;
- struct pinmux_hog *hog;
-
- seq_puts(s, "Pinmux map hogs held by device\n");
-
- list_for_each_entry(hog, &pctldev->pinmux_hogs, node)
- seq_printf(s, "%s\n", hog->map->name);
+ mutex_unlock(&pinctrl_mutex);
return 0;
}
-static int pinmux_show(struct seq_file *s, void *what)
+void pinmux_show_map(struct seq_file *s, struct pinctrl_map const *map)
{
- struct pinmux *pmx;
-
- seq_puts(s, "Requested pinmuxes and their maps:\n");
- list_for_each_entry(pmx, &pinmux_list, node) {
- struct pinctrl_dev *pctldev = pmx->pctldev;
- const struct pinmux_ops *pmxops;
- const struct pinctrl_ops *pctlops;
- struct pinmux_group *grp;
-
- if (!pctldev) {
- seq_puts(s, "NO PIN CONTROLLER DEVICE\n");
- continue;
- }
-
- pmxops = pctldev->desc->pmxops;
- pctlops = pctldev->desc->pctlops;
-
- seq_printf(s, "device: %s function: %s (%u),",
- pinctrl_dev_get_name(pmx->pctldev),
- pmxops->get_function_name(pctldev, pmx->func_selector),
- pmx->func_selector);
-
- seq_printf(s, " groups: [");
- list_for_each_entry(grp, &pmx->groups, node) {
- seq_printf(s, " %s (%u)",
- pctlops->get_group_name(pctldev, grp->group_selector),
- grp->group_selector);
- }
- seq_printf(s, " ]");
-
- seq_printf(s, " users: %u map-> %s\n",
- pmx->usecount,
- pmx->dev ? dev_name(pmx->dev) : "(system)");
- }
-
- return 0;
+ seq_printf(s, "group %s\nfunction %s\n",
+ map->data.mux.group ? map->data.mux.group : "(default)",
+ map->data.mux.function);
}
-static int pinmux_maps_show(struct seq_file *s, void *what)
+void pinmux_show_setting(struct seq_file *s,
+ struct pinctrl_setting const *setting)
{
- int i;
+ struct pinctrl_dev *pctldev = setting->pctldev;
+ const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
+ const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
- seq_puts(s, "Pinmux maps:\n");
-
- for (i = 0; i < pinmux_maps_num; i++) {
- struct pinmux_map const *map = &pinmux_maps[i];
-
- seq_printf(s, "%s:\n", map->name);
- if (map->dev || map->dev_name)
- seq_printf(s, " device: %s\n",
- map->dev ? dev_name(map->dev) :
- map->dev_name);
- else
- seq_printf(s, " SYSTEM MUX\n");
- seq_printf(s, " controlling device %s\n",
- map->ctrl_dev ? dev_name(map->ctrl_dev) :
- map->ctrl_dev_name);
- seq_printf(s, " function: %s\n", map->function);
- seq_printf(s, " group: %s\n", map->group ? map->group :
- "(default)");
- }
- return 0;
+ seq_printf(s, "group: %s (%u) function: %s (%u)\n",
+ pctlops->get_group_name(pctldev, setting->data.mux.group),
+ setting->data.mux.group,
+ pmxops->get_function_name(pctldev, setting->data.mux.func),
+ setting->data.mux.func);
}
static int pinmux_functions_open(struct inode *inode, struct file *file)
return single_open(file, pinmux_pins_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 pinmux_open(struct inode *inode, struct file *file)
-{
- return single_open(file, pinmux_show, NULL);
-}
-
-static int pinmux_maps_open(struct inode *inode, struct file *file)
-{
- return single_open(file, pinmux_maps_show, NULL);
-}
-
static const struct file_operations pinmux_functions_ops = {
.open = pinmux_functions_open,
.read = seq_read,
.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 pinmux_ops = {
- .open = pinmux_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static const struct file_operations pinmux_maps_ops = {
- .open = pinmux_maps_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
void pinmux_init_device_debugfs(struct dentry *devroot,
struct pinctrl_dev *pctldev)
{
devroot, pctldev, &pinmux_functions_ops);
debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO,
devroot, pctldev, &pinmux_pins_ops);
- debugfs_create_file("pinmux-hogs", S_IFREG | S_IRUGO,
- devroot, pctldev, &pinmux_hogs_ops);
-}
-
-void pinmux_init_debugfs(struct dentry *subsys_root)
-{
- debugfs_create_file("pinmuxes", S_IFREG | S_IRUGO,
- subsys_root, NULL, &pinmux_ops);
- debugfs_create_file("pinmux-maps", S_IFREG | S_IRUGO,
- subsys_root, NULL, &pinmux_maps_ops);
}
#endif /* CONFIG_DEBUG_FS */
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blobdiff