/*
* Core driver for 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
*
#include "pinmux.h"
#include "pinconf.h"
+/**
+ * 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);
+/* List of pin controller handles */
+static DEFINE_MUTEX(pinctrl_list_mutex);
+static LIST_HEAD(pinctrl_list);
+
+/* Global pinctrl maps */
+static struct pinctrl_map *pinctrl_maps;
+static unsigned pinctrl_maps_num;
+
const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
{
/* We're not allowed to register devices without name */
return -EINVAL;
}
+/**
+ * pinctrl_request_gpio() - request a single pin to be used 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.
+ */
+int pinctrl_request_gpio(unsigned gpio)
+{
+ struct pinctrl_dev *pctldev;
+ struct pinctrl_gpio_range *range;
+ 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;
+
+ return pinmux_request_gpio(pctldev, range, pin, gpio);
+}
+EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
+
+/**
+ * pinctrl_free_gpio() - free control on 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.
+ */
+void pinctrl_free_gpio(unsigned gpio)
+{
+ struct pinctrl_dev *pctldev;
+ struct pinctrl_gpio_range *range;
+ int ret;
+ int pin;
+
+ 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;
+
+ return pinmux_free_gpio(pctldev, pin, range);
+}
+EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
+
+static int pinctrl_gpio_direction(unsigned gpio, bool input)
+{
+ struct pinctrl_dev *pctldev;
+ struct pinctrl_gpio_range *range;
+ int ret;
+ int pin;
+
+ ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
+ if (ret)
+ return ret;
+
+ /* Convert to the pin controllers number space */
+ pin = gpio - range->base + range->pin_base;
+
+ return pinmux_gpio_direction(pctldev, range, pin, input);
+}
+
+/**
+ * pinctrl_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 pin control GPIO calls.
+ */
+int pinctrl_gpio_direction_input(unsigned gpio)
+{
+ return pinctrl_gpio_direction(gpio, true);
+}
+EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
+
+/**
+ * pinctrl_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 pin control GPIO calls.
+ */
+int pinctrl_gpio_direction_output(unsigned gpio)
+{
+ return pinctrl_gpio_direction(gpio, false);
+}
+EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
+
+/**
+ * pinctrl_get() - retrieves the pin controller handle for a certain device
+ * @dev: the device to get the pin controller handle for
+ * @name: an optional specific control 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 pin control (not tied to any specific device)
+ */
+struct pinctrl *pinctrl_get(struct device *dev, const char *name)
+{
+ struct pinctrl_map const *map = NULL;
+ struct pinctrl_dev *pctldev = NULL;
+ const char *devname = NULL;
+ struct pinctrl *p;
+ 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 pin control handle %s for device %s\n", name,
+ devname ? devname : "(none)");
+
+ /*
+ * create the state cookie holder struct pinctrl for each
+ * mapping, this is what consumers will get when requesting
+ * a pin control handle with pinctrl_get()
+ */
+ p = kzalloc(sizeof(struct pinctrl), GFP_KERNEL);
+ if (p == NULL)
+ return ERR_PTR(-ENOMEM);
+ mutex_init(&p->mutex);
+ pinmux_init_pinctrl_handle(p);
+
+ /* Iterate over the pin control maps to locate the right ones */
+ for (i = 0; i < pinctrl_maps_num; i++) {
+ map = &pinctrl_maps[i];
+ found_map = false;
+
+ /*
+ * First, try to find the pctldev given in the map
+ */
+ pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
+ if (!pctldev) {
+ 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",
+ map->ctrl_dev_name);
+
+ /* 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_apply_muxmap(pctldev, p, dev,
+ devname, map);
+ if (ret) {
+ kfree(p);
+ 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(p);
+ 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(&pinctrl_list_mutex);
+ list_add(&p->node, &pinctrl_list);
+ mutex_unlock(&pinctrl_list_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)
+{
+ 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()
+ */
+int pinctrl_enable(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()
+ */
+void pinctrl_disable(struct pinctrl *p)
+{
+ if (p == NULL)
+ return;
+
+ mutex_lock(&p->mutex);
+ if (--p->usecount == 0) {
+ pinmux_disable(p);
+ }
+ mutex_unlock(&p->mutex);
+}
+EXPORT_SYMBOL_GPL(pinctrl_disable);
+
+/**
+ * pinctrl_register_mappings() - register a set of pin controller mappings
+ * @maps: the pincontrol 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 pinctrl_register_mappings(struct pinctrl_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_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_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 (!pinctrl_maps_num) {
+ /* On first call, just copy them */
+ tmp_maps = kmemdup(maps,
+ sizeof(struct pinctrl_map) * num_maps,
+ GFP_KERNEL);
+ if (!tmp_maps)
+ return -ENOMEM;
+ } else {
+ /* Subsequent calls, reallocate array to new size */
+ size_t oldsize = sizeof(struct pinctrl_map) * pinctrl_maps_num;
+ size_t newsize = sizeof(struct pinctrl_map) * num_maps;
+
+ tmp_maps = krealloc(pinctrl_maps,
+ oldsize + newsize, GFP_KERNEL);
+ if (!tmp_maps)
+ return -ENOMEM;
+ memcpy((tmp_maps + oldsize), maps, newsize);
+ }
+
+ pinctrl_maps = tmp_maps;
+ pinctrl_maps_num += num_maps;
+ 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;
+
+ if (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 pinctrl_hog), GFP_KERNEL);
+ if (!hog)
+ return -ENOMEM;
+
+ p = pinctrl_get(NULL, 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);
+ mutex_lock(&pctldev->pinctrl_hogs_lock);
+ list_add(&hog->node, &pctldev->pinctrl_hogs);
+ mutex_unlock(&pctldev->pinctrl_hogs_lock);
+
+ 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.
+ */
+int pinctrl_hog_maps(struct pinctrl_dev *pctldev)
+{
+ struct device *dev = pctldev->dev;
+ const char *devname = dev_name(dev);
+ int ret;
+ int i;
+
+ INIT_LIST_HEAD(&pctldev->pinctrl_hogs);
+ mutex_init(&pctldev->pinctrl_hogs_lock);
+
+ for (i = 0; i < pinctrl_maps_num; i++) {
+ struct pinctrl_map const *map = &pinctrl_maps[i];
+
+ if (!map->hog_on_boot)
+ continue;
+
+ if (map->ctrl_dev_name &&
+ !strcmp(map->ctrl_dev_name, devname)) {
+ /* OK time to hog! */
+ ret = pinctrl_hog_map(pctldev, map);
+ if (ret)
+ return ret;
+ }
+ }
+ return 0;
+}
+
+/**
+ * pinctrl_unhog_maps() - unhog specific map entries on controller device
+ * @pctldev: the pin control device to unhog entries on
+ */
+void pinctrl_unhog_maps(struct pinctrl_dev *pctldev)
+{
+ struct list_head *node, *tmp;
+
+ mutex_lock(&pctldev->pinctrl_hogs_lock);
+ 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);
+ }
+ mutex_unlock(&pctldev->pinctrl_hogs_lock);
+}
+
#ifdef CONFIG_DEBUG_FS
static int pinctrl_pins_show(struct seq_file *s, void *what)
return 0;
}
+static int pinctrl_maps_show(struct seq_file *s, void *what)
+{
+ int i;
+
+ seq_puts(s, "Pinctrl maps:\n");
+
+ for (i = 0; i < pinctrl_maps_num; i++) {
+ struct pinctrl_map const *map = &pinctrl_maps[i];
+
+ seq_printf(s, "%s:\n", map->name);
+ if (map->dev_name)
+ seq_printf(s, " device: %s\n",
+ map->dev_name);
+ else
+ seq_printf(s, " SYSTEM MUX\n");
+ seq_printf(s, " controlling device %s\n",
+ 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;
+}
+
+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;
return 0;
}
+static int pinctrl_show(struct seq_file *s, void *what)
+{
+ struct pinctrl *p;
+
+ seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
+ list_for_each_entry(p, &pinctrl_list, node) {
+ struct pinctrl_dev *pctldev = p->pctldev;
+
+ if (!pctldev) {
+ seq_puts(s, "NO PIN CONTROLLER DEVICE\n");
+ continue;
+ }
+
+ seq_printf(s, "device: %s",
+ pinctrl_dev_get_name(p->pctldev));
+
+ pinmux_dbg_show(s, p);
+
+ seq_printf(s, " users: %u map-> %s\n",
+ p->usecount,
+ p->dev ? dev_name(p->dev) : "(system)");
+ }
+
+ return 0;
+}
+
static int pinctrl_pins_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_pins_show, inode->i_private);
return single_open(file, pinctrl_gpioranges_show, inode->i_private);
}
+static int pinctrl_maps_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, pinctrl_maps_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);
}
+static int pinctrl_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, pinctrl_show, NULL);
+}
+
static const struct file_operations pinctrl_pins_ops = {
.open = pinctrl_pins_open,
.read = seq_read,
.release = single_release,
};
+static const struct file_operations pinctrl_maps_ops = {
+ .open = pinctrl_maps_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .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,
.release = single_release,
};
+static const struct file_operations pinctrl_ops = {
+ .open = pinctrl_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static struct dentry *debugfs_root;
static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
device_root, pctldev, &pinctrl_groups_ops);
debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
device_root, pctldev, &pinctrl_gpioranges_ops);
+ debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
+ device_root, pctldev, &pinctrl_maps_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);
}
debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
debugfs_root, NULL, &pinctrl_devices_ops);
- pinmux_init_debugfs(debugfs_root);
+ debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
+ debugfs_root, NULL, &pinctrl_ops);
}
#else /* CONFIG_DEBUG_FS */
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinmux.h>
#include "core.h"
-
-/* List of pin controller handles */
-static DEFINE_MUTEX(pinctrl_list_mutex);
-static LIST_HEAD(pinctrl_list);
-
-/* Global pinctrl maps */
-static struct pinctrl_map *pinctrl_maps;
-static unsigned pinctrl_maps_num;
+#include "pinmux.h"
/**
* struct pinmux_group - group list item for pinmux groups
unsigned group_selector;
};
-/**
- * struct pinctrl - per-device pin control state holder
- * @node: global list node
- * @dev: the device using this pin control handle
- * @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
- * @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 pinctrl {
- struct list_head node;
- struct device *dev;
- unsigned usecount;
- struct pinctrl_dev *pctldev;
- unsigned func_selector;
- struct list_head groups;
- struct mutex mutex;
-};
-
-/**
- * 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;
-};
-
/**
* pin_request() - request a single pin to be muxed in, typically for GPIO
* @pin: the pin number in the global pin space
}
/**
- * pinctrl_request_gpio() - request a single pin to be used 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 pinctrl_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;
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);
return ret;
}
-EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
/**
- * pinctrl_free_gpio() - free control on 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 pinctrl_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;
- 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);
}
-EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
-static int pinctrl_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;
}
-/**
- * pinctrl_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 pin control GPIO calls.
- */
-int pinctrl_gpio_direction_input(unsigned gpio)
-{
- return pinctrl_gpio_direction(gpio, true);
-}
-EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
-
-/**
- * pinctrl_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 pin control GPIO calls.
- */
-int pinctrl_gpio_direction_output(unsigned gpio)
-{
- return pinctrl_gpio_direction(gpio, false);
-}
-EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
-
-/**
- * pinctrl_register_mappings() - register a set of pin controller mappings
- * @maps: the pincontrol 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 pinctrl_register_mappings(struct pinctrl_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_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_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 (!pinctrl_maps_num) {
- /* On first call, just copy them */
- tmp_maps = kmemdup(maps,
- sizeof(struct pinctrl_map) * num_maps,
- GFP_KERNEL);
- if (!tmp_maps)
- return -ENOMEM;
- } else {
- /* Subsequent calls, reallocate array to new size */
- size_t oldsize = sizeof(struct pinctrl_map) * pinctrl_maps_num;
- size_t newsize = sizeof(struct pinctrl_map) * num_maps;
-
- tmp_maps = krealloc(pinctrl_maps,
- oldsize + newsize, GFP_KERNEL);
- if (!tmp_maps)
- return -ENOMEM;
- memcpy((tmp_maps + oldsize), maps, newsize);
- }
-
- pinctrl_maps = tmp_maps;
- pinctrl_maps_num += num_maps;
- return 0;
-}
-
/**
* acquire_pins() - acquire all the pins for a certain function on a pinmux
* @pctldev: the device to take the pins on
return 0;
}
-static void pinmux_free_groups(struct pinctrl *p)
-{
- struct list_head *node, *tmp;
-
- list_for_each_safe(node, tmp, &p->groups) {
- struct pinmux_group *grp =
- list_entry(node, struct pinmux_group, node);
- /* Release all pins taken by this group */
- release_pins(p->pctldev, grp->group_selector);
- list_del(node);
- kfree(grp);
- }
-}
-
/**
- * pinctrl_get() - retrieves the pin controller handle for a certain device
- * @dev: the device to get the pin controller handle for
- * @name: an optional specific control 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 pin control (not tied to any specific device)
+ * pinmux_apply_muxmap() - apply a certain mux mapping entry
*/
-struct pinctrl *pinctrl_get(struct device *dev, const char *name)
+int pinmux_apply_muxmap(struct pinctrl_dev *pctldev,
+ struct pinctrl *p,
+ struct device *dev,
+ const char *devname,
+ struct pinctrl_map const *map)
{
- struct pinctrl_map const *map = NULL;
- struct pinctrl_dev *pctldev = NULL;
- const char *devname = NULL;
- struct pinctrl *p;
- 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()
- */
- p = kzalloc(sizeof(struct pinctrl), GFP_KERNEL);
- if (p == NULL)
- return ERR_PTR(-ENOMEM);
- mutex_init(&p->mutex);
- p->func_selector = UINT_MAX;
- INIT_LIST_HEAD(&p->groups);
-
- /* Iterate over the pin control maps to locate the right ones */
- for (i = 0; i < pinctrl_maps_num; i++) {
- map = &pinctrl_maps[i];
- found_map = false;
-
- /*
- * First, try to find the pctldev given in the map
- */
- pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
- if (!pctldev) {
- 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",
- map->ctrl_dev_name);
-
- /* 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, p, dev,
- devname, map);
- if (ret) {
- pinmux_free_groups(p);
- kfree(p);
- return ERR_PTR(ret);
- }
- num_maps++;
- }
- }
-
+ int ret;
- /* 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(p);
- return ERR_PTR(-EINVAL);
+ ret = pinmux_enable_muxmap(pctldev, p, dev,
+ devname, map);
+ if (ret) {
+ pinmux_put(p);
+ return ret;
}
- 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(&pinctrl_list_mutex);
- list_add(&p->node, &pinctrl_list);
- mutex_unlock(&pinctrl_list_mutex);
-
- return p;
+ return 0;
}
-EXPORT_SYMBOL_GPL(pinctrl_get);
/**
- * pinctrl_put() - release a previously claimed pin control handle
- * @p: a pin control handle previously claimed by pinctrl_get()
+ * pinmux_put() - free up the pinmux portions of a pin controller handle
*/
-void pinctrl_put(struct pinctrl *p)
+void pinmux_put(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_free_groups(p);
- mutex_unlock(&p->mutex);
-
- /* Remove from list */
- mutex_lock(&pinctrl_list_mutex);
- list_del(&p->node);
- mutex_unlock(&pinctrl_list_mutex);
+ struct list_head *node, *tmp;
- kfree(p);
+ list_for_each_safe(node, tmp, &p->groups) {
+ struct pinmux_group *grp =
+ list_entry(node, struct pinmux_group, node);
+ /* Release all pins taken by this group */
+ release_pins(p->pctldev, grp->group_selector);
+ list_del(node);
+ kfree(grp);
+ }
}
-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()
+ * pinmux_enable() - enable the pinmux portion of a pin control handle
*/
-int pinctrl_enable(struct pinctrl *p)
+int pinmux_enable(struct pinctrl *p)
{
- int ret = 0;
+ struct pinctrl_dev *pctldev = p->pctldev;
+ const struct pinmux_ops *ops = pctldev->desc->pmxops;
+ struct pinmux_group *grp;
+ int ret;
- if (p == NULL)
- return -EINVAL;
- mutex_lock(&p->mutex);
- if (p->usecount++ == 0) {
- struct pinctrl_dev *pctldev = p->pctldev;
- const struct pinmux_ops *ops = pctldev->desc->pmxops;
- struct pinmux_group *grp;
-
- list_for_each_entry(grp, &p->groups, node) {
- ret = ops->enable(pctldev, p->func_selector,
- grp->group_selector);
- if (ret) {
- /*
- * TODO: call disable() on all groups we called
- * enable() on to this point?
- */
- p->usecount--;
- break;
- }
- }
+ list_for_each_entry(grp, &p->groups, node) {
+ ret = ops->enable(pctldev, p->func_selector,
+ grp->group_selector);
+ if (ret)
+ /*
+ * TODO: call disable() on all groups we called
+ * enable() on to this point?
+ */
+ return ret;
}
- mutex_unlock(&p->mutex);
- return ret;
+ return 0;
}
-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()
+ * pinmux_disable() - disable the pinmux portions of a pin control handle
*/
-void pinctrl_disable(struct pinctrl *p)
+void pinmux_disable(struct pinctrl *p)
{
- if (p == NULL)
- return;
-
- mutex_lock(&p->mutex);
- if (--p->usecount == 0) {
- struct pinctrl_dev *pctldev = p->pctldev;
- const struct pinmux_ops *ops = pctldev->desc->pmxops;
- struct pinmux_group *grp;
+ struct pinctrl_dev *pctldev = p->pctldev;
+ const struct pinmux_ops *ops = pctldev->desc->pmxops;
+ struct pinmux_group *grp;
- list_for_each_entry(grp, &p->groups, node) {
- ops->disable(pctldev, p->func_selector,
- grp->group_selector);
- }
+ list_for_each_entry(grp, &p->groups, node) {
+ ops->disable(pctldev, p->func_selector,
+ grp->group_selector);
}
- mutex_unlock(&p->mutex);
}
-EXPORT_SYMBOL_GPL(pinctrl_disable);
int pinmux_check_ops(struct pinctrl_dev *pctldev)
{
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;
-
- if (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 pinctrl_hog), GFP_KERNEL);
- if (!hog)
- return -ENOMEM;
-
- p = pinctrl_get(NULL, 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);
- mutex_lock(&pctldev->pinctrl_hogs_lock);
- list_add(&hog->node, &pctldev->pinctrl_hogs);
- mutex_unlock(&pctldev->pinctrl_hogs_lock);
-
- 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.
- */
-int pinctrl_hog_maps(struct pinctrl_dev *pctldev)
-{
- struct device *dev = pctldev->dev;
- const char *devname = dev_name(dev);
- int ret;
- int i;
-
- INIT_LIST_HEAD(&pctldev->pinctrl_hogs);
- mutex_init(&pctldev->pinctrl_hogs_lock);
-
- for (i = 0; i < pinctrl_maps_num; i++) {
- struct pinctrl_map const *map = &pinctrl_maps[i];
-
- if (!map->hog_on_boot)
- continue;
-
- if (map->ctrl_dev_name &&
- !strcmp(map->ctrl_dev_name, devname)) {
- /* OK time to hog! */
- ret = pinctrl_hog_map(pctldev, map);
- if (ret)
- return ret;
- }
- }
- return 0;
-}
-
-/**
- * pinctrl_unhog_maps() - unhog specific map entries on controller device
- * @pctldev: the pin control device to unhog entries on
- */
-void pinctrl_unhog_maps(struct pinctrl_dev *pctldev)
-{
- struct list_head *node, *tmp;
-
- mutex_lock(&pctldev->pinctrl_hogs_lock);
- 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);
- }
- mutex_unlock(&pctldev->pinctrl_hogs_lock);
-}
-
#ifdef CONFIG_DEBUG_FS
/* Called from pincontrol core */
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 pinmux_show(struct seq_file *s, void *what)
+void pinmux_dbg_show(struct seq_file *s, struct pinctrl *p)
{
- struct pinctrl *p;
-
- seq_puts(s, "Requested pinmuxes and their maps:\n");
- list_for_each_entry(p, &pinctrl_list, node) {
- struct pinctrl_dev *pctldev = p->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(p->pctldev),
- pmxops->get_function_name(pctldev,
- p->func_selector),
- p->func_selector);
-
- seq_printf(s, " groups: [");
- list_for_each_entry(grp, &p->groups, node) {
- seq_printf(s, " %s (%u)",
- pctlops->get_group_name(pctldev,
- grp->group_selector),
- grp->group_selector);
- }
- seq_printf(s, " ]");
+ struct pinctrl_dev *pctldev = p->pctldev;
+ const struct pinmux_ops *pmxops;
+ const struct pinctrl_ops *pctlops;
+ struct pinmux_group *grp;
- seq_printf(s, " users: %u map-> %s\n",
- p->usecount,
- p->dev ? dev_name(p->dev) : "(system)");
- }
+ pmxops = pctldev->desc->pmxops;
+ pctlops = pctldev->desc->pctlops;
- return 0;
-}
-
-static int pinctrl_maps_show(struct seq_file *s, void *what)
-{
- int i;
+ seq_printf(s, " function: %s (%u),",
+ pmxops->get_function_name(pctldev,
+ p->func_selector),
+ p->func_selector);
- seq_puts(s, "Pinctrl maps:\n");
-
- for (i = 0; i < pinctrl_maps_num; i++) {
- struct pinctrl_map const *map = &pinctrl_maps[i];
-
- seq_printf(s, "%s:\n", map->name);
- if (map->dev_name)
- seq_printf(s, " device: %s\n",
- map->dev_name);
- else
- seq_printf(s, " SYSTEM MUX\n");
- seq_printf(s, " controlling device %s\n",
- map->ctrl_dev_name);
- seq_printf(s, " function: %s\n", map->function);
- seq_printf(s, " group: %s\n", map->group ? map->group :
- "(default)");
+ seq_printf(s, " groups: [");
+ list_for_each_entry(grp, &p->groups, node) {
+ seq_printf(s, " %s (%u)",
+ pctlops->get_group_name(pctldev,
+ grp->group_selector),
+ grp->group_selector);
}
- return 0;
+ seq_printf(s, " ]");
}
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 pinctrl_maps_open(struct inode *inode, struct file *file)
-{
- return single_open(file, pinctrl_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 pinctrl_maps_ops = {
- .open = pinctrl_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("pinctrl-maps", S_IFREG | S_IRUGO,
- subsys_root, NULL, &pinctrl_maps_ops);
}
#endif /* CONFIG_DEBUG_FS */
projects / linux-beck.git / commitdiff