| /* |
| * Core driver for the pin control subsystem |
| * |
| * 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) "pinctrl core: " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/export.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/slab.h> |
| #include <linux/err.h> |
| #include <linux/list.h> |
| #include <linux/sysfs.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/pinctrl/consumer.h> |
| #include <linux/pinctrl/pinctrl.h> |
| #include <linux/pinctrl/machine.h> |
| #include "core.h" |
| #include "devicetree.h" |
| #include "pinmux.h" |
| #include "pinconf.h" |
| |
| /** |
| * struct pinctrl_maps - a list item containing part of the mapping table |
| * @node: mapping table list node |
| * @maps: array of mapping table entries |
| * @num_maps: the number of entries in @maps |
| */ |
| struct pinctrl_maps { |
| struct list_head node; |
| struct pinctrl_map const *maps; |
| unsigned num_maps; |
| }; |
| |
| /* Mutex taken by all entry points */ |
| DEFINE_MUTEX(pinctrl_mutex); |
| |
| /* Global list of pin control devices (struct pinctrl_dev) */ |
| LIST_HEAD(pinctrldev_list); |
| |
| /* List of pin controller handles (struct pinctrl) */ |
| static LIST_HEAD(pinctrl_list); |
| |
| /* List of pinctrl maps (struct pinctrl_maps) */ |
| static LIST_HEAD(pinctrl_maps); |
| |
| #define for_each_maps(_maps_node_, _i_, _map_) \ |
| list_for_each_entry(_maps_node_, &pinctrl_maps, node) \ |
| for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \ |
| _i_ < _maps_node_->num_maps; \ |
| i++, _map_ = &_maps_node_->maps[_i_]) |
| |
| const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) |
| { |
| /* We're not allowed to register devices without name */ |
| return pctldev->desc->name; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); |
| |
| void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) |
| { |
| return pctldev->driver_data; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); |
| |
| /** |
| * get_pinctrl_dev_from_devname() - look up pin controller device |
| * @devname: the name of a device instance, as returned by dev_name() |
| * |
| * Looks up a pin control device matching a certain device name or pure device |
| * pointer, the pure device pointer will take precedence. |
| */ |
| struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname) |
| { |
| struct pinctrl_dev *pctldev = NULL; |
| bool found = false; |
| |
| if (!devname) |
| return NULL; |
| |
| list_for_each_entry(pctldev, &pinctrldev_list, node) { |
| if (!strcmp(dev_name(pctldev->dev), devname)) { |
| /* Matched on device name */ |
| found = true; |
| break; |
| } |
| } |
| |
| return found ? pctldev : NULL; |
| } |
| |
| /** |
| * pin_get_from_name() - look up a pin number from a name |
| * @pctldev: the pin control device to lookup the pin on |
| * @name: the name of the pin to look up |
| */ |
| int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) |
| { |
| unsigned i, pin; |
| |
| /* The pin number can be retrived from the pin controller descriptor */ |
| for (i = 0; i < pctldev->desc->npins; i++) { |
| struct pin_desc *desc; |
| |
| pin = pctldev->desc->pins[i].number; |
| desc = pin_desc_get(pctldev, pin); |
| /* Pin space may be sparse */ |
| if (desc == NULL) |
| continue; |
| if (desc->name && !strcmp(name, desc->name)) |
| return pin; |
| } |
| |
| return -EINVAL; |
| } |
| |
| /** |
| * pin_get_name_from_id() - look up a pin name from a pin id |
| * @pctldev: the pin control device to lookup the pin on |
| * @name: the name of the pin to look up |
| */ |
| const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin) |
| { |
| const struct pin_desc *desc; |
| |
| desc = pin_desc_get(pctldev, pin); |
| if (desc == NULL) { |
| dev_err(pctldev->dev, "failed to get pin(%d) name\n", |
| pin); |
| return NULL; |
| } |
| |
| return desc->name; |
| } |
| |
| /** |
| * pin_is_valid() - check if pin exists on controller |
| * @pctldev: the pin control device to check the pin on |
| * @pin: pin to check, use the local pin controller index number |
| * |
| * This tells us whether a certain pin exist on a certain pin controller or |
| * not. Pin lists may be sparse, so some pins may not exist. |
| */ |
| bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) |
| { |
| struct pin_desc *pindesc; |
| |
| if (pin < 0) |
| return false; |
| |
| mutex_lock(&pinctrl_mutex); |
| pindesc = pin_desc_get(pctldev, pin); |
| mutex_unlock(&pinctrl_mutex); |
| |
| return pindesc != NULL; |
| } |
| EXPORT_SYMBOL_GPL(pin_is_valid); |
| |
| /* Deletes a range of pin descriptors */ |
| static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, |
| const struct pinctrl_pin_desc *pins, |
| unsigned num_pins) |
| { |
| int i; |
| |
| for (i = 0; i < num_pins; i++) { |
| struct pin_desc *pindesc; |
| |
| pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, |
| pins[i].number); |
| if (pindesc != NULL) { |
| radix_tree_delete(&pctldev->pin_desc_tree, |
| pins[i].number); |
| if (pindesc->dynamic_name) |
| kfree(pindesc->name); |
| } |
| kfree(pindesc); |
| } |
| } |
| |
| static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, |
| unsigned number, const char *name) |
| { |
| struct pin_desc *pindesc; |
| |
| pindesc = pin_desc_get(pctldev, number); |
| if (pindesc != NULL) { |
| pr_err("pin %d already registered on %s\n", number, |
| pctldev->desc->name); |
| return -EINVAL; |
| } |
| |
| pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); |
| if (pindesc == NULL) { |
| dev_err(pctldev->dev, "failed to alloc struct pin_desc\n"); |
| return -ENOMEM; |
| } |
| |
| /* Set owner */ |
| pindesc->pctldev = pctldev; |
| |
| /* Copy basic pin info */ |
| if (name) { |
| pindesc->name = name; |
| } else { |
| pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number); |
| if (pindesc->name == NULL) |
| return -ENOMEM; |
| pindesc->dynamic_name = true; |
| } |
| |
| radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); |
| pr_debug("registered pin %d (%s) on %s\n", |
| number, pindesc->name, pctldev->desc->name); |
| return 0; |
| } |
| |
| static int pinctrl_register_pins(struct pinctrl_dev *pctldev, |
| struct pinctrl_pin_desc const *pins, |
| unsigned num_descs) |
| { |
| unsigned i; |
| int ret = 0; |
| |
| for (i = 0; i < num_descs; i++) { |
| ret = pinctrl_register_one_pin(pctldev, |
| pins[i].number, pins[i].name); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range |
| * @pctldev: pin controller device to check |
| * @gpio: gpio pin to check taken from the global GPIO pin space |
| * |
| * Tries to match a GPIO pin number to the ranges handled by a certain pin |
| * controller, return the range or NULL |
| */ |
| static struct pinctrl_gpio_range * |
| pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) |
| { |
| struct pinctrl_gpio_range *range = NULL; |
| |
| /* Loop over the ranges */ |
| list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
| /* Check if we're in the valid range */ |
| if (gpio >= range->base && |
| gpio < range->base + range->npins) { |
| return range; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /** |
| * pinctrl_get_device_gpio_range() - find device for GPIO range |
| * @gpio: the pin to locate the pin controller for |
| * @outdev: the pin control device if found |
| * @outrange: the GPIO range if found |
| * |
| * Find the pin controller handling a certain GPIO pin from the pinspace of |
| * the GPIO subsystem, return the device and the matching GPIO range. Returns |
| * negative if the GPIO range could not be found in any device. |
| */ |
| static int pinctrl_get_device_gpio_range(unsigned gpio, |
| struct pinctrl_dev **outdev, |
| struct pinctrl_gpio_range **outrange) |
| { |
| struct pinctrl_dev *pctldev = NULL; |
| |
| /* Loop over the pin controllers */ |
| list_for_each_entry(pctldev, &pinctrldev_list, node) { |
| struct pinctrl_gpio_range *range; |
| |
| range = pinctrl_match_gpio_range(pctldev, gpio); |
| if (range != NULL) { |
| *outdev = pctldev; |
| *outrange = range; |
| return 0; |
| } |
| } |
| |
| return -EINVAL; |
| } |
| |
| /** |
| * pinctrl_add_gpio_range() - register a GPIO range for a controller |
| * @pctldev: pin controller device to add the range to |
| * @range: the GPIO range to add |
| * |
| * This adds a range of GPIOs to be handled by a certain pin controller. Call |
| * this to register handled ranges after registering your pin controller. |
| */ |
| void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, |
| struct pinctrl_gpio_range *range) |
| { |
| mutex_lock(&pinctrl_mutex); |
| list_add_tail(&range->node, &pctldev->gpio_ranges); |
| mutex_unlock(&pinctrl_mutex); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range); |
| |
| /** |
| * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller |
| * @pctldev: pin controller device to remove the range from |
| * @range: the GPIO range to remove |
| */ |
| void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, |
| struct pinctrl_gpio_range *range) |
| { |
| mutex_lock(&pinctrl_mutex); |
| list_del(&range->node); |
| mutex_unlock(&pinctrl_mutex); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range); |
| |
| /** |
| * pinctrl_get_group_selector() - returns the group selector for a group |
| * @pctldev: the pin controller handling the group |
| * @pin_group: the pin group to look up |
| */ |
| int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, |
| const char *pin_group) |
| { |
| const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
| unsigned ngroups = pctlops->get_groups_count(pctldev); |
| unsigned group_selector = 0; |
| |
| while (group_selector < ngroups) { |
| const char *gname = pctlops->get_group_name(pctldev, |
| group_selector); |
| if (!strcmp(gname, pin_group)) { |
| dev_dbg(pctldev->dev, |
| "found group selector %u for %s\n", |
| group_selector, |
| pin_group); |
| return group_selector; |
| } |
| |
| group_selector++; |
| } |
| |
| dev_err(pctldev->dev, "does not have pin group %s\n", |
| pin_group); |
| |
| 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; |
| |
| mutex_lock(&pinctrl_mutex); |
| |
| ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
| if (ret) { |
| mutex_unlock(&pinctrl_mutex); |
| return -EINVAL; |
| } |
| |
| /* Convert to the pin controllers number space */ |
| pin = gpio - range->base + range->pin_base; |
| |
| ret = pinmux_request_gpio(pctldev, range, pin, gpio); |
| |
| mutex_unlock(&pinctrl_mutex); |
| 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. |
| */ |
| void pinctrl_free_gpio(unsigned gpio) |
| { |
| struct pinctrl_dev *pctldev; |
| struct pinctrl_gpio_range *range; |
| int ret; |
| int pin; |
| |
| mutex_lock(&pinctrl_mutex); |
| |
| ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
| if (ret) { |
| mutex_unlock(&pinctrl_mutex); |
| return; |
| } |
| |
| /* Convert to the pin controllers number space */ |
| pin = gpio - range->base + range->pin_base; |
| |
| pinmux_free_gpio(pctldev, pin, range); |
| |
| mutex_unlock(&pinctrl_mutex); |
| } |
| 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) |
| { |
| int ret; |
| mutex_lock(&pinctrl_mutex); |
| ret = pinctrl_gpio_direction(gpio, true); |
| mutex_unlock(&pinctrl_mutex); |
| return ret; |
| } |
| 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) |
| { |
| int ret; |
| mutex_lock(&pinctrl_mutex); |
| ret = pinctrl_gpio_direction(gpio, false); |
| mutex_unlock(&pinctrl_mutex); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); |
| |
| static struct pinctrl_state *find_state(struct pinctrl *p, |
| const char *name) |
| { |
| struct pinctrl_state *state; |
| |
| list_for_each_entry(state, &p->states, node) |
| if (!strcmp(state->name, name)) |
| return state; |
| |
| return NULL; |
| } |
| |
| static struct pinctrl_state *create_state(struct pinctrl *p, |
| const char *name) |
| { |
| struct pinctrl_state *state; |
| |
| state = kzalloc(sizeof(*state), GFP_KERNEL); |
| if (state == NULL) { |
| dev_err(p->dev, |
| "failed to alloc struct pinctrl_state\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| state->name = name; |
| INIT_LIST_HEAD(&state->settings); |
| |
| list_add_tail(&state->node, &p->states); |
| |
| return state; |
| } |
| |
| static int add_setting(struct pinctrl *p, struct pinctrl_map const *map) |
| { |
| struct pinctrl_state *state; |
| struct pinctrl_setting *setting; |
| int ret; |
| |
| state = find_state(p, map->name); |
| if (!state) |
| state = create_state(p, map->name); |
| if (IS_ERR(state)) |
| return PTR_ERR(state); |
| |
| if (map->type == PIN_MAP_TYPE_DUMMY_STATE) |
| return 0; |
| |
| setting = kzalloc(sizeof(*setting), GFP_KERNEL); |
| if (setting == NULL) { |
| dev_err(p->dev, |
| "failed to alloc struct pinctrl_setting\n"); |
| return -ENOMEM; |
| } |
| |
| setting->type = map->type; |
| |
| setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); |
| if (setting->pctldev == NULL) { |
| dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe", |
| map->ctrl_dev_name); |
| kfree(setting); |
| /* |
| * OK let us guess that the driver is not there yet, and |
| * let's defer obtaining this pinctrl handle to later... |
| */ |
| return -EPROBE_DEFER; |
| } |
| |
| switch (map->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| ret = pinmux_map_to_setting(map, setting); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| ret = pinconf_map_to_setting(map, setting); |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| if (ret < 0) { |
| kfree(setting); |
| return ret; |
| } |
| |
| list_add_tail(&setting->node, &state->settings); |
| |
| return 0; |
| } |
| |
| static struct pinctrl *find_pinctrl(struct device *dev) |
| { |
| struct pinctrl *p; |
| |
| list_for_each_entry(p, &pinctrl_list, node) |
| if (p->dev == dev) |
| return p; |
| |
| return NULL; |
| } |
| |
| static void pinctrl_put_locked(struct pinctrl *p, bool inlist); |
| |
| static struct pinctrl *create_pinctrl(struct device *dev) |
| { |
| struct pinctrl *p; |
| const char *devname; |
| struct pinctrl_maps *maps_node; |
| int i; |
| struct pinctrl_map const *map; |
| int ret; |
| |
| /* |
| * 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(*p), GFP_KERNEL); |
| if (p == NULL) { |
| dev_err(dev, "failed to alloc struct pinctrl\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| p->dev = dev; |
| INIT_LIST_HEAD(&p->states); |
| INIT_LIST_HEAD(&p->dt_maps); |
| |
| ret = pinctrl_dt_to_map(p); |
| if (ret < 0) { |
| kfree(p); |
| return ERR_PTR(ret); |
| } |
| |
| devname = dev_name(dev); |
| |
| /* Iterate over the pin control maps to locate the right ones */ |
| for_each_maps(maps_node, i, map) { |
| /* Map must be for this device */ |
| if (strcmp(map->dev_name, devname)) |
| continue; |
| |
| ret = add_setting(p, map); |
| if (ret < 0) { |
| pinctrl_put_locked(p, false); |
| return ERR_PTR(ret); |
| } |
| } |
| |
| /* Add the pinmux to the global list */ |
| list_add_tail(&p->node, &pinctrl_list); |
| |
| return p; |
| } |
| |
| static struct pinctrl *pinctrl_get_locked(struct device *dev) |
| { |
| struct pinctrl *p; |
| |
| if (WARN_ON(!dev)) |
| return ERR_PTR(-EINVAL); |
| |
| p = find_pinctrl(dev); |
| if (p != NULL) |
| return ERR_PTR(-EBUSY); |
| |
| p = create_pinctrl(dev); |
| if (IS_ERR(p)) |
| return p; |
| |
| return p; |
| } |
| |
| /** |
| * pinctrl_get() - retrieves the pinctrl handle for a device |
| * @dev: the device to obtain the handle for |
| */ |
| struct pinctrl *pinctrl_get(struct device *dev) |
| { |
| struct pinctrl *p; |
| |
| mutex_lock(&pinctrl_mutex); |
| p = pinctrl_get_locked(dev); |
| mutex_unlock(&pinctrl_mutex); |
| |
| return p; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_get); |
| |
| static void pinctrl_put_locked(struct pinctrl *p, bool inlist) |
| { |
| struct pinctrl_state *state, *n1; |
| struct pinctrl_setting *setting, *n2; |
| |
| list_for_each_entry_safe(state, n1, &p->states, node) { |
| list_for_each_entry_safe(setting, n2, &state->settings, node) { |
| switch (setting->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| if (state == p->state) |
| pinmux_disable_setting(setting); |
| pinmux_free_setting(setting); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| pinconf_free_setting(setting); |
| break; |
| default: |
| break; |
| } |
| list_del(&setting->node); |
| kfree(setting); |
| } |
| list_del(&state->node); |
| kfree(state); |
| } |
| |
| pinctrl_dt_free_maps(p); |
| |
| if (inlist) |
| list_del(&p->node); |
| kfree(p); |
| } |
| |
| /** |
| * pinctrl_put() - release a previously claimed pinctrl handle |
| * @p: the pinctrl handle to release |
| */ |
| void pinctrl_put(struct pinctrl *p) |
| { |
| mutex_lock(&pinctrl_mutex); |
| pinctrl_put_locked(p, true); |
| mutex_unlock(&pinctrl_mutex); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_put); |
| |
| static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p, |
| const char *name) |
| { |
| struct pinctrl_state *state; |
| |
| state = find_state(p, name); |
| if (!state) |
| return ERR_PTR(-ENODEV); |
| |
| return state; |
| } |
| |
| /** |
| * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle |
| * @p: the pinctrl handle to retrieve the state from |
| * @name: the state name to retrieve |
| */ |
| struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name) |
| { |
| struct pinctrl_state *s; |
| |
| mutex_lock(&pinctrl_mutex); |
| s = pinctrl_lookup_state_locked(p, name); |
| mutex_unlock(&pinctrl_mutex); |
| |
| return s; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_lookup_state); |
| |
| static int pinctrl_select_state_locked(struct pinctrl *p, |
| struct pinctrl_state *state) |
| { |
| struct pinctrl_setting *setting, *setting2; |
| int ret; |
| |
| if (p->state == state) |
| return 0; |
| |
| if (p->state) { |
| /* |
| * The set of groups with a mux configuration in the old state |
| * may not be identical to the set of groups with a mux setting |
| * in the new state. While this might be unusual, it's entirely |
| * possible for the "user"-supplied mapping table to be written |
| * that way. For each group that was configured in the old state |
| * but not in the new state, this code puts that group into a |
| * safe/disabled state. |
| */ |
| list_for_each_entry(setting, &p->state->settings, node) { |
| bool found = false; |
| if (setting->type != PIN_MAP_TYPE_MUX_GROUP) |
| continue; |
| list_for_each_entry(setting2, &state->settings, node) { |
| if (setting2->type != PIN_MAP_TYPE_MUX_GROUP) |
| continue; |
| if (setting2->data.mux.group == |
| setting->data.mux.group) { |
| found = true; |
| break; |
| } |
| } |
| if (!found) |
| pinmux_disable_setting(setting); |
| } |
| } |
| |
| p->state = state; |
| |
| /* Apply all the settings for the new state */ |
| list_for_each_entry(setting, &state->settings, node) { |
| switch (setting->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| ret = pinmux_enable_setting(setting); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| ret = pinconf_apply_setting(setting); |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| if (ret < 0) { |
| /* FIXME: Difficult to return to prev state */ |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * pinctrl_select() - select/activate/program a pinctrl state to HW |
| * @p: the pinctrl handle for the device that requests configuratio |
| * @state: the state handle to select/activate/program |
| */ |
| int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) |
| { |
| int ret; |
| |
| mutex_lock(&pinctrl_mutex); |
| ret = pinctrl_select_state_locked(p, state); |
| mutex_unlock(&pinctrl_mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_select_state); |
| |
| static void devm_pinctrl_release(struct device *dev, void *res) |
| { |
| pinctrl_put(*(struct pinctrl **)res); |
| } |
| |
| /** |
| * struct devm_pinctrl_get() - Resource managed pinctrl_get() |
| * @dev: the device to obtain the handle for |
| * |
| * If there is a need to explicitly destroy the returned struct pinctrl, |
| * devm_pinctrl_put() should be used, rather than plain pinctrl_put(). |
| */ |
| struct pinctrl *devm_pinctrl_get(struct device *dev) |
| { |
| struct pinctrl **ptr, *p; |
| |
| ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return ERR_PTR(-ENOMEM); |
| |
| p = pinctrl_get(dev); |
| if (!IS_ERR(p)) { |
| *ptr = p; |
| devres_add(dev, ptr); |
| } else { |
| devres_free(ptr); |
| } |
| |
| return p; |
| } |
| EXPORT_SYMBOL_GPL(devm_pinctrl_get); |
| |
| static int devm_pinctrl_match(struct device *dev, void *res, void *data) |
| { |
| struct pinctrl **p = res; |
| |
| return *p == data; |
| } |
| |
| /** |
| * devm_pinctrl_put() - Resource managed pinctrl_put() |
| * @p: the pinctrl handle to release |
| * |
| * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally |
| * this function will not need to be called and the resource management |
| * code will ensure that the resource is freed. |
| */ |
| void devm_pinctrl_put(struct pinctrl *p) |
| { |
| WARN_ON(devres_destroy(p->dev, devm_pinctrl_release, |
| devm_pinctrl_match, p)); |
| pinctrl_put(p); |
| } |
| EXPORT_SYMBOL_GPL(devm_pinctrl_put); |
| |
| int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps, |
| bool dup, bool locked) |
| { |
| int i, ret; |
| struct pinctrl_maps *maps_node; |
| |
| 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].dev_name) { |
| pr_err("failed to register map %s (%d): no device given\n", |
| maps[i].name, i); |
| return -EINVAL; |
| } |
| |
| if (!maps[i].name) { |
| pr_err("failed to register map %d: no map name given\n", |
| i); |
| return -EINVAL; |
| } |
| |
| if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE && |
| !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; |
| } |
| |
| switch (maps[i].type) { |
| case PIN_MAP_TYPE_DUMMY_STATE: |
| break; |
| case PIN_MAP_TYPE_MUX_GROUP: |
| ret = pinmux_validate_map(&maps[i], i); |
| if (ret < 0) |
| return 0; |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| ret = pinconf_validate_map(&maps[i], i); |
| if (ret < 0) |
| return 0; |
| break; |
| default: |
| pr_err("failed to register map %s (%d): invalid type given\n", |
| maps[i].name, i); |
| return -EINVAL; |
| } |
| } |
| |
| maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL); |
| if (!maps_node) { |
| pr_err("failed to alloc struct pinctrl_maps\n"); |
| return -ENOMEM; |
| } |
| |
| maps_node->num_maps = num_maps; |
| if (dup) { |
| maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps, |
| GFP_KERNEL); |
| if (!maps_node->maps) { |
| pr_err("failed to duplicate mapping table\n"); |
| kfree(maps_node); |
| return -ENOMEM; |
| } |
| } else { |
| maps_node->maps = maps; |
| } |
| |
| if (!locked) |
| mutex_lock(&pinctrl_mutex); |
| list_add_tail(&maps_node->node, &pinctrl_maps); |
| if (!locked) |
| mutex_unlock(&pinctrl_mutex); |
| |
| return 0; |
| } |
| |
| /** |
| * pinctrl_register_mappings() - register a set of pin controller mappings |
| * @maps: the pincontrol mappings table to register. This should probably 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 |
| */ |
| int pinctrl_register_mappings(struct pinctrl_map const *maps, |
| unsigned num_maps) |
| { |
| return pinctrl_register_map(maps, num_maps, true, false); |
| } |
| |
| void pinctrl_unregister_map(struct pinctrl_map const *map) |
| { |
| struct pinctrl_maps *maps_node; |
| |
| list_for_each_entry(maps_node, &pinctrl_maps, node) { |
| if (maps_node->maps == map) { |
| list_del(&maps_node->node); |
| return; |
| } |
| } |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| |
| static int pinctrl_pins_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev = s->private; |
| const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
| unsigned i, pin; |
| |
| seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); |
| |
| 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; |
| |
| pin = pctldev->desc->pins[i].number; |
| desc = pin_desc_get(pctldev, pin); |
| /* Pin space may be sparse */ |
| if (desc == NULL) |
| continue; |
| |
| seq_printf(s, "pin %d (%s) ", pin, |
| desc->name ? desc->name : "unnamed"); |
| |
| /* Driver-specific info per pin */ |
| if (ops->pin_dbg_show) |
| ops->pin_dbg_show(pctldev, s, pin); |
| |
| seq_puts(s, "\n"); |
| } |
| |
| mutex_unlock(&pinctrl_mutex); |
| |
| return 0; |
| } |
| |
| static int pinctrl_groups_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev = s->private; |
| const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
| unsigned ngroups, selector = 0; |
| |
| ngroups = ops->get_groups_count(pctldev); |
| mutex_lock(&pinctrl_mutex); |
| |
| seq_puts(s, "registered pin groups:\n"); |
| while (selector < ngroups) { |
| const unsigned *pins; |
| unsigned num_pins; |
| const char *gname = ops->get_group_name(pctldev, selector); |
| const char *pname; |
| int ret; |
| int i; |
| |
| ret = ops->get_group_pins(pctldev, selector, |
| &pins, &num_pins); |
| if (ret) |
| seq_printf(s, "%s [ERROR GETTING PINS]\n", |
| gname); |
| else { |
| seq_printf(s, "group: %s\n", gname); |
| for (i = 0; i < num_pins; i++) { |
| pname = pin_get_name(pctldev, pins[i]); |
| if (WARN_ON(!pname)) |
| return -EINVAL; |
| seq_printf(s, "pin %d (%s)\n", pins[i], pname); |
| } |
| seq_puts(s, "\n"); |
| } |
| selector++; |
| } |
| |
| mutex_unlock(&pinctrl_mutex); |
| |
| return 0; |
| } |
| |
| static int pinctrl_gpioranges_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev = s->private; |
| struct pinctrl_gpio_range *range = NULL; |
| |
| seq_puts(s, "GPIO ranges handled:\n"); |
| |
| mutex_lock(&pinctrl_mutex); |
| |
| /* Loop over the ranges */ |
| list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
| seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
| range->id, range->name, |
| range->base, (range->base + range->npins - 1), |
| range->pin_base, |
| (range->pin_base + range->npins - 1)); |
| } |
| |
| mutex_unlock(&pinctrl_mutex); |
| |
| return 0; |
| } |
| |
| static int pinctrl_devices_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev; |
| |
| seq_puts(s, "name [pinmux] [pinconf]\n"); |
| |
| mutex_lock(&pinctrl_mutex); |
| |
| list_for_each_entry(pctldev, &pinctrldev_list, node) { |
| seq_printf(s, "%s ", pctldev->desc->name); |
| if (pctldev->desc->pmxops) |
| seq_puts(s, "yes "); |
| else |
| seq_puts(s, "no "); |
| if (pctldev->desc->confops) |
| seq_puts(s, "yes"); |
| else |
| seq_puts(s, "no"); |
| seq_puts(s, "\n"); |
| } |
| |
| mutex_unlock(&pinctrl_mutex); |
| |
| return 0; |
| } |
| |
| static inline const char *map_type(enum pinctrl_map_type type) |
| { |
| static const char * const names[] = { |
| "INVALID", |
| "DUMMY_STATE", |
| "MUX_GROUP", |
| "CONFIGS_PIN", |
| "CONFIGS_GROUP", |
| }; |
| |
| if (type >= ARRAY_SIZE(names)) |
| return "UNKNOWN"; |
| |
| return names[type]; |
| } |
| |
| static int pinctrl_maps_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_maps *maps_node; |
| int i; |
| struct pinctrl_map const *map; |
| |
| seq_puts(s, "Pinctrl maps:\n"); |
| |
| mutex_lock(&pinctrl_mutex); |
| |
| for_each_maps(maps_node, i, map) { |
| seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n", |
| map->dev_name, map->name, map_type(map->type), |
| map->type); |
| |
| if (map->type != PIN_MAP_TYPE_DUMMY_STATE) |
| seq_printf(s, "controlling device %s\n", |
| map->ctrl_dev_name); |
| |
| switch (map->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| pinmux_show_map(s, map); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| pinconf_show_map(s, map); |
| break; |
| default: |
| break; |
| } |
| |
| seq_printf(s, "\n"); |
| } |
| |
| mutex_unlock(&pinctrl_mutex); |
| |
| return 0; |
| } |
| |
| static int pinctrl_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl *p; |
| struct pinctrl_state *state; |
| struct pinctrl_setting *setting; |
| |
| seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); |
| |
| mutex_lock(&pinctrl_mutex); |
| |
| list_for_each_entry(p, &pinctrl_list, node) { |
| seq_printf(s, "device: %s current state: %s\n", |
| dev_name(p->dev), |
| p->state ? p->state->name : "none"); |
| |
| list_for_each_entry(state, &p->states, node) { |
| seq_printf(s, " state: %s\n", state->name); |
| |
| list_for_each_entry(setting, &state->settings, node) { |
| struct pinctrl_dev *pctldev = setting->pctldev; |
| |
| seq_printf(s, " type: %s controller %s ", |
| map_type(setting->type), |
| pinctrl_dev_get_name(pctldev)); |
| |
| switch (setting->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| pinmux_show_setting(s, setting); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| pinconf_show_setting(s, setting); |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| } |
| |
| mutex_unlock(&pinctrl_mutex); |
| |
| return 0; |
| } |
| |
| static int pinctrl_pins_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, pinctrl_pins_show, inode->i_private); |
| } |
| |
| static int pinctrl_groups_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, pinctrl_groups_show, inode->i_private); |
| } |
| |
| static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, pinctrl_gpioranges_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_maps_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, pinctrl_maps_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, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static const struct file_operations pinctrl_groups_ops = { |
| .open = pinctrl_groups_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static const struct file_operations pinctrl_gpioranges_ops = { |
| .open = pinctrl_gpioranges_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, |
| .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, |
| }; |
| |
| 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) |
| { |
| struct dentry *device_root; |
| |
| device_root = debugfs_create_dir(dev_name(pctldev->dev), |
| debugfs_root); |
| pctldev->device_root = device_root; |
| |
| if (IS_ERR(device_root) || !device_root) { |
| pr_warn("failed to create debugfs directory for %s\n", |
| dev_name(pctldev->dev)); |
| return; |
| } |
| debugfs_create_file("pins", S_IFREG | S_IRUGO, |
| device_root, pctldev, &pinctrl_pins_ops); |
| debugfs_create_file("pingroups", S_IFREG | S_IRUGO, |
| device_root, pctldev, &pinctrl_groups_ops); |
| debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, |
| device_root, pctldev, &pinctrl_gpioranges_ops); |
| pinmux_init_device_debugfs(device_root, pctldev); |
| pinconf_init_device_debugfs(device_root, pctldev); |
| } |
| |
| static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
| { |
| debugfs_remove_recursive(pctldev->device_root); |
| } |
| |
| static void pinctrl_init_debugfs(void) |
| { |
| debugfs_root = debugfs_create_dir("pinctrl", NULL); |
| if (IS_ERR(debugfs_root) || !debugfs_root) { |
| pr_warn("failed to create debugfs directory\n"); |
| debugfs_root = NULL; |
| return; |
| } |
| |
| debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, |
| debugfs_root, NULL, &pinctrl_devices_ops); |
| debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, |
| debugfs_root, NULL, &pinctrl_maps_ops); |
| debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, |
| debugfs_root, NULL, &pinctrl_ops); |
| } |
| |
| #else /* CONFIG_DEBUG_FS */ |
| |
| static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) |
| { |
| } |
| |
| static void pinctrl_init_debugfs(void) |
| { |
| } |
| |
| static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
| { |
| } |
| |
| #endif |
| |
| static int pinctrl_check_ops(struct pinctrl_dev *pctldev) |
| { |
| const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
| |
| if (!ops || |
| !ops->get_groups_count || |
| !ops->get_group_name || |
| !ops->get_group_pins) |
| return -EINVAL; |
| |
| if (ops->dt_node_to_map && !ops->dt_free_map) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| /** |
| * pinctrl_register() - register a pin controller device |
| * @pctldesc: descriptor for this pin controller |
| * @dev: parent device for this pin controller |
| * @driver_data: private pin controller data for this pin controller |
| */ |
| struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, |
| struct device *dev, void *driver_data) |
| { |
| struct pinctrl_dev *pctldev; |
| int ret; |
| |
| if (pctldesc == NULL) |
| return NULL; |
| if (pctldesc->name == NULL) |
| return NULL; |
| |
| pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL); |
| if (pctldev == NULL) { |
| dev_err(dev, "failed to alloc struct pinctrl_dev\n"); |
| return NULL; |
| } |
| |
| /* Initialize pin control device struct */ |
| pctldev->owner = pctldesc->owner; |
| pctldev->desc = pctldesc; |
| pctldev->driver_data = driver_data; |
| INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); |
| INIT_LIST_HEAD(&pctldev->gpio_ranges); |
| pctldev->dev = dev; |
| |
| /* check core ops for sanity */ |
| ret = pinctrl_check_ops(pctldev); |
| if (ret) { |
| pr_err("%s pinctrl ops lacks necessary functions\n", |
| pctldesc->name); |
| goto out_err; |
| } |
| |
| /* If we're implementing pinmuxing, check the ops for sanity */ |
| if (pctldesc->pmxops) { |
| ret = pinmux_check_ops(pctldev); |
| if (ret) { |
| pr_err("%s pinmux ops lacks necessary functions\n", |
| pctldesc->name); |
| goto out_err; |
| } |
| } |
| |
| /* If we're implementing pinconfig, check the ops for sanity */ |
| if (pctldesc->confops) { |
| ret = pinconf_check_ops(pctldev); |
| if (ret) { |
| pr_err("%s pin config ops lacks necessary functions\n", |
| pctldesc->name); |
| goto out_err; |
| } |
| } |
| |
| /* Register all the pins */ |
| pr_debug("try to register %d pins on %s...\n", |
| pctldesc->npins, pctldesc->name); |
| ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); |
| if (ret) { |
| pr_err("error during pin registration\n"); |
| pinctrl_free_pindescs(pctldev, pctldesc->pins, |
| pctldesc->npins); |
| goto out_err; |
| } |
| |
| mutex_lock(&pinctrl_mutex); |
| |
| list_add_tail(&pctldev->node, &pinctrldev_list); |
| |
| pctldev->p = pinctrl_get_locked(pctldev->dev); |
| if (!IS_ERR(pctldev->p)) { |
| struct pinctrl_state *s = |
| pinctrl_lookup_state_locked(pctldev->p, |
| PINCTRL_STATE_DEFAULT); |
| if (!IS_ERR(s)) |
| pinctrl_select_state_locked(pctldev->p, s); |
| } |
| |
| mutex_unlock(&pinctrl_mutex); |
| |
| pinctrl_init_device_debugfs(pctldev); |
| |
| return pctldev; |
| |
| out_err: |
| kfree(pctldev); |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_register); |
| |
| /** |
| * pinctrl_unregister() - unregister pinmux |
| * @pctldev: pin controller to unregister |
| * |
| * Called by pinmux drivers to unregister a pinmux. |
| */ |
| void pinctrl_unregister(struct pinctrl_dev *pctldev) |
| { |
| if (pctldev == NULL) |
| return; |
| |
| pinctrl_remove_device_debugfs(pctldev); |
| |
| mutex_lock(&pinctrl_mutex); |
| |
| if (!IS_ERR(pctldev->p)) |
| pinctrl_put_locked(pctldev->p, true); |
| |
| /* TODO: check that no pinmuxes are still active? */ |
| list_del(&pctldev->node); |
| /* Destroy descriptor tree */ |
| pinctrl_free_pindescs(pctldev, pctldev->desc->pins, |
| pctldev->desc->npins); |
| kfree(pctldev); |
| |
| mutex_unlock(&pinctrl_mutex); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_unregister); |
| |
| static int __init pinctrl_init(void) |
| { |
| pr_info("initialized pinctrl subsystem\n"); |
| pinctrl_init_debugfs(); |
| return 0; |
| } |
| |
| /* init early since many drivers really need to initialized pinmux early */ |
| core_initcall(pinctrl_init); |