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![Patrice Chotard](/assets/img/avatar_default.png)
This mutex avoids deadlock in case of use of multiple pin controllers. Before this modification, by using a global mutex, deadlock appeared when, for example, a call to pinctrl_pins_show() locked the pinctrl_mutex, called the ops->pin_dbg_show of a particular pin controller. If this pin controller needs I2C access to retrieve configuration information and I2C driver is using pinctrl to drive its pins, a call to pinctrl_select_state() try to lock again pinctrl_mutex which leads to a deadlock. Notice that the mutex grab from the two direction functions was moved into pinctrl_gpio_direction(). For several cases, we can't replace pinctrl_mutex by pctldev->mutex, because at this stage, pctldev is not accessible : - pinctrl_get()/pinctrl_put() - pinctrl_register_maps() So add respectively pinctrl_list_mutex and pinctrl_maps_mutex in order to protect pinctrl_list and pinctrl_maps list instead. Reintroduce pinctrldev_list_mutex in find_pinctrl_by_of_node(), pinctrl_find_and_add_gpio_range() pinctrl_request_gpio(), pinctrl_free_gpio(), pinctrl_gpio_direction(), pinctrl_devices_show(), pinctrl_register() and pinctrl_unregister() to protect pinctrldev_list. Changes v2->v3: - Fix a missing EXPORT_SYMBOL_GPL() for pinctrl_select_state(). Changes v1->v2: - pinctrl_select_state_locked() is removed, all lock mechanism is located inside pinctrl_select_state(). When parsing the state->setting list, take the per-pin-controller driver lock. (Patrice). - Introduce pinctrldev_list_mutex to protect pinctrldev_list in all functions which parse or modify pictrldev_list. (Patrice). - move find_pinctrl_by_of_node() from pinctrl/devicetree.c to pinctrl/core.c in order to protect pinctrldev_list. (Patrice). - Sink mutex:es into some functions and remove some _locked variants down to where the lists are actually accessed to make things simpler. (Linus) - Drop *all* mutexes completely from pinctrl_lookup_state() and pinctrl_select_state() - no relevant mutex was taken and it was unclear what this was protecting against. (Linus) Reported by : Seraphin Bonnaffe <seraphin.bonnaffe@stericsson.com> Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
645 lines
16 KiB
C
645 lines
16 KiB
C
/*
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* Core driver for the pin muxing portions of the pin control subsystem
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*
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* Copyright (C) 2011-2012 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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* Based on bits of regulator core, gpio core and clk core
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#define pr_fmt(fmt) "pinmux core: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/radix-tree.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/pinctrl/machine.h>
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#include <linux/pinctrl/pinmux.h>
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#include "core.h"
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#include "pinmux.h"
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int pinmux_check_ops(struct pinctrl_dev *pctldev)
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{
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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unsigned nfuncs;
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unsigned selector = 0;
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/* Check that we implement required operations */
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if (!ops ||
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!ops->get_functions_count ||
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!ops->get_function_name ||
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!ops->get_function_groups ||
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!ops->enable) {
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dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n");
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return -EINVAL;
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}
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/* Check that all functions registered have names */
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nfuncs = ops->get_functions_count(pctldev);
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while (selector < nfuncs) {
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const char *fname = ops->get_function_name(pctldev,
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selector);
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if (!fname) {
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dev_err(pctldev->dev, "pinmux ops has no name for function%u\n",
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selector);
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return -EINVAL;
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}
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selector++;
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}
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return 0;
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}
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int pinmux_validate_map(struct pinctrl_map const *map, int i)
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{
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if (!map->data.mux.function) {
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pr_err("failed to register map %s (%d): no function given\n",
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map->name, i);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* pin_request() - request a single pin to be muxed in, typically for GPIO
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* @pin: the pin number in the global pin space
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* @owner: a representation of the owner of this pin; typically the device
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* name that controls its mux function, or the requested GPIO name
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* @gpio_range: the range matching the GPIO pin if this is a request for a
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* single GPIO pin
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*/
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static int pin_request(struct pinctrl_dev *pctldev,
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int pin, const char *owner,
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struct pinctrl_gpio_range *gpio_range)
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{
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struct pin_desc *desc;
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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int status = -EINVAL;
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desc = pin_desc_get(pctldev, pin);
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if (desc == NULL) {
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dev_err(pctldev->dev,
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"pin %d is not registered so it cannot be requested\n",
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pin);
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goto out;
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}
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dev_dbg(pctldev->dev, "request pin %d (%s) for %s\n",
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pin, desc->name, owner);
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if (gpio_range) {
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/* There's no need to support multiple GPIO requests */
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if (desc->gpio_owner) {
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dev_err(pctldev->dev,
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"pin %s already requested by %s; cannot claim for %s\n",
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desc->name, desc->gpio_owner, owner);
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goto out;
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}
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desc->gpio_owner = owner;
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} else {
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if (desc->mux_usecount && strcmp(desc->mux_owner, owner)) {
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dev_err(pctldev->dev,
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"pin %s already requested by %s; cannot claim for %s\n",
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desc->name, desc->mux_owner, owner);
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goto out;
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}
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desc->mux_usecount++;
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if (desc->mux_usecount > 1)
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return 0;
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desc->mux_owner = owner;
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}
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/* Let each pin increase references to this module */
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if (!try_module_get(pctldev->owner)) {
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dev_err(pctldev->dev,
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"could not increase module refcount for pin %d\n",
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pin);
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status = -EINVAL;
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goto out_free_pin;
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}
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/*
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* If there is no kind of request function for the pin we just assume
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* we got it by default and proceed.
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*/
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if (gpio_range && ops->gpio_request_enable)
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/* This requests and enables a single GPIO pin */
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status = ops->gpio_request_enable(pctldev, gpio_range, pin);
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else if (ops->request)
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status = ops->request(pctldev, pin);
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else
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status = 0;
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if (status) {
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dev_err(pctldev->dev, "request() failed for pin %d\n", pin);
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module_put(pctldev->owner);
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}
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out_free_pin:
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if (status) {
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if (gpio_range) {
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desc->gpio_owner = NULL;
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} else {
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desc->mux_usecount--;
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if (!desc->mux_usecount)
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desc->mux_owner = NULL;
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}
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}
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out:
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if (status)
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dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
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pin, owner, status);
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return status;
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}
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/**
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* pin_free() - release a single muxed in pin so something else can be muxed
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* @pctldev: pin controller device handling this pin
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* @pin: the pin to free
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* @gpio_range: the range matching the GPIO pin if this is a request for a
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* single GPIO pin
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*
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* This function returns a pointer to the previous owner. This is used
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* for callers that dynamically allocate an owner name so it can be freed
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* once the pin is free. This is done for GPIO request functions.
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*/
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static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
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struct pinctrl_gpio_range *gpio_range)
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{
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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struct pin_desc *desc;
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const char *owner;
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desc = pin_desc_get(pctldev, pin);
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if (desc == NULL) {
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dev_err(pctldev->dev,
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"pin is not registered so it cannot be freed\n");
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return NULL;
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}
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if (!gpio_range) {
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/*
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* A pin should not be freed more times than allocated.
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*/
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if (WARN_ON(!desc->mux_usecount))
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return NULL;
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desc->mux_usecount--;
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if (desc->mux_usecount)
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return NULL;
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}
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/*
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* If there is no kind of request function for the pin we just assume
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* we got it by default and proceed.
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*/
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if (gpio_range && ops->gpio_disable_free)
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ops->gpio_disable_free(pctldev, gpio_range, pin);
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else if (ops->free)
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ops->free(pctldev, pin);
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if (gpio_range) {
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owner = desc->gpio_owner;
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desc->gpio_owner = NULL;
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} else {
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owner = desc->mux_owner;
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desc->mux_owner = NULL;
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desc->mux_setting = NULL;
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}
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module_put(pctldev->owner);
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return owner;
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}
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/**
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* pinmux_request_gpio() - request pinmuxing for a GPIO pin
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* @pctldev: pin controller device affected
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* @pin: the pin to mux in for GPIO
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* @range: the applicable GPIO range
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*/
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int pinmux_request_gpio(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned pin, unsigned gpio)
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{
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const char *owner;
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int ret;
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/* Conjure some name stating what chip and pin this is taken by */
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owner = kasprintf(GFP_KERNEL, "%s:%d", range->name, gpio);
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if (!owner)
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return -EINVAL;
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ret = pin_request(pctldev, pin, owner, range);
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if (ret < 0)
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kfree(owner);
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return ret;
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}
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/**
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* pinmux_free_gpio() - release a pin from GPIO muxing
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* @pctldev: the pin controller device for the pin
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* @pin: the affected currently GPIO-muxed in pin
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* @range: applicable GPIO range
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*/
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void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin,
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struct pinctrl_gpio_range *range)
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{
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const char *owner;
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owner = pin_free(pctldev, pin, range);
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kfree(owner);
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}
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/**
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* pinmux_gpio_direction() - set the direction of a single muxed-in GPIO pin
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* @pctldev: the pin controller handling this pin
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* @range: applicable GPIO range
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* @pin: the affected GPIO pin in this controller
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* @input: true if we set the pin as input, false for output
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*/
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int pinmux_gpio_direction(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned pin, bool input)
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{
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const struct pinmux_ops *ops;
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int ret;
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ops = pctldev->desc->pmxops;
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if (ops->gpio_set_direction)
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ret = ops->gpio_set_direction(pctldev, range, pin, input);
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else
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ret = 0;
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return ret;
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}
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static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
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const char *function)
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{
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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unsigned nfuncs = ops->get_functions_count(pctldev);
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unsigned selector = 0;
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/* See if this pctldev has this function */
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while (selector < nfuncs) {
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const char *fname = ops->get_function_name(pctldev,
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selector);
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if (!strcmp(function, fname))
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return selector;
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selector++;
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}
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pr_err("%s does not support function %s\n",
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pinctrl_dev_get_name(pctldev), function);
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return -EINVAL;
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}
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int pinmux_map_to_setting(struct pinctrl_map const *map,
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struct pinctrl_setting *setting)
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{
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struct pinctrl_dev *pctldev = setting->pctldev;
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const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
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char const * const *groups;
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unsigned num_groups;
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int ret;
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const char *group;
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int i;
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if (!pmxops) {
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dev_err(pctldev->dev, "does not support mux function\n");
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return -EINVAL;
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}
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ret = pinmux_func_name_to_selector(pctldev, map->data.mux.function);
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if (ret < 0) {
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dev_err(pctldev->dev, "invalid function %s in map table\n",
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map->data.mux.function);
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return ret;
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}
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setting->data.mux.func = ret;
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ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
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&groups, &num_groups);
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if (ret < 0) {
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dev_err(pctldev->dev, "can't query groups for function %s\n",
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map->data.mux.function);
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return ret;
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}
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if (!num_groups) {
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dev_err(pctldev->dev,
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"function %s can't be selected on any group\n",
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map->data.mux.function);
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return -EINVAL;
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}
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if (map->data.mux.group) {
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bool found = false;
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group = map->data.mux.group;
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for (i = 0; i < num_groups; i++) {
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if (!strcmp(group, groups[i])) {
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found = true;
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break;
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}
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}
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if (!found) {
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dev_err(pctldev->dev,
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"invalid group \"%s\" for function \"%s\"\n",
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group, map->data.mux.function);
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return -EINVAL;
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}
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} else {
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group = groups[0];
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}
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ret = pinctrl_get_group_selector(pctldev, group);
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if (ret < 0) {
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dev_err(pctldev->dev, "invalid group %s in map table\n",
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map->data.mux.group);
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return ret;
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}
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setting->data.mux.group = ret;
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return 0;
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}
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void pinmux_free_setting(struct pinctrl_setting const *setting)
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{
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/* This function is currently unused */
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}
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int pinmux_enable_setting(struct pinctrl_setting const *setting)
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{
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struct pinctrl_dev *pctldev = setting->pctldev;
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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int ret;
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const unsigned *pins;
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unsigned num_pins;
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int i;
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struct pin_desc *desc;
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ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
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&pins, &num_pins);
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if (ret) {
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/* errors only affect debug data, so just warn */
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dev_warn(pctldev->dev,
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"could not get pins for group selector %d\n",
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setting->data.mux.group);
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num_pins = 0;
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}
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/* Try to allocate all pins in this group, one by one */
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for (i = 0; i < num_pins; i++) {
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ret = pin_request(pctldev, pins[i], setting->dev_name, NULL);
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if (ret) {
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dev_err(pctldev->dev,
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"could not request pin %d on device %s\n",
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pins[i], pinctrl_dev_get_name(pctldev));
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goto err_pin_request;
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}
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}
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/* Now that we have acquired the pins, encode the mux setting */
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for (i = 0; i < num_pins; i++) {
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desc = pin_desc_get(pctldev, pins[i]);
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if (desc == NULL) {
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dev_warn(pctldev->dev,
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"could not get pin desc for pin %d\n",
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pins[i]);
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continue;
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}
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desc->mux_setting = &(setting->data.mux);
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}
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ret = ops->enable(pctldev, setting->data.mux.func,
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setting->data.mux.group);
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if (ret)
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goto err_enable;
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return 0;
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err_enable:
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for (i = 0; i < num_pins; i++) {
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desc = pin_desc_get(pctldev, pins[i]);
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if (desc)
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desc->mux_setting = NULL;
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}
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err_pin_request:
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/* On error release all taken pins */
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while (--i >= 0)
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pin_free(pctldev, pins[i], NULL);
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return ret;
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}
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void pinmux_disable_setting(struct pinctrl_setting const *setting)
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{
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struct pinctrl_dev *pctldev = setting->pctldev;
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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int ret;
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const unsigned *pins;
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unsigned num_pins;
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int i;
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struct pin_desc *desc;
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ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
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&pins, &num_pins);
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if (ret) {
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/* errors only affect debug data, so just warn */
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dev_warn(pctldev->dev,
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"could not get pins for group selector %d\n",
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setting->data.mux.group);
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num_pins = 0;
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}
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/* Flag the descs that no setting is active */
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for (i = 0; i < num_pins; i++) {
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desc = pin_desc_get(pctldev, pins[i]);
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if (desc == NULL) {
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dev_warn(pctldev->dev,
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"could not get pin desc for pin %d\n",
|
|
pins[i]);
|
|
continue;
|
|
}
|
|
desc->mux_setting = NULL;
|
|
}
|
|
|
|
/* And release the pins */
|
|
for (i = 0; i < num_pins; i++)
|
|
pin_free(pctldev, pins[i], NULL);
|
|
|
|
if (ops->disable)
|
|
ops->disable(pctldev, setting->data.mux.func, setting->data.mux.group);
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
/* Called from pincontrol core */
|
|
static int pinmux_functions_show(struct seq_file *s, void *what)
|
|
{
|
|
struct pinctrl_dev *pctldev = s->private;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
unsigned nfuncs;
|
|
unsigned func_selector = 0;
|
|
|
|
if (!pmxops)
|
|
return 0;
|
|
|
|
mutex_lock(&pctldev->mutex);
|
|
nfuncs = pmxops->get_functions_count(pctldev);
|
|
while (func_selector < nfuncs) {
|
|
const char *func = pmxops->get_function_name(pctldev,
|
|
func_selector);
|
|
const char * const *groups;
|
|
unsigned num_groups;
|
|
int ret;
|
|
int i;
|
|
|
|
ret = pmxops->get_function_groups(pctldev, func_selector,
|
|
&groups, &num_groups);
|
|
if (ret)
|
|
seq_printf(s, "function %s: COULD NOT GET GROUPS\n",
|
|
func);
|
|
|
|
seq_printf(s, "function: %s, groups = [ ", func);
|
|
for (i = 0; i < num_groups; i++)
|
|
seq_printf(s, "%s ", groups[i]);
|
|
seq_puts(s, "]\n");
|
|
|
|
func_selector++;
|
|
}
|
|
|
|
mutex_unlock(&pctldev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pinmux_pins_show(struct seq_file *s, void *what)
|
|
{
|
|
struct pinctrl_dev *pctldev = s->private;
|
|
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
unsigned i, pin;
|
|
|
|
if (!pmxops)
|
|
return 0;
|
|
|
|
seq_puts(s, "Pinmux settings per pin\n");
|
|
seq_puts(s, "Format: pin (name): mux_owner gpio_owner hog?\n");
|
|
|
|
mutex_lock(&pctldev->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);
|
|
/* Skip if we cannot search the pin */
|
|
if (desc == NULL)
|
|
continue;
|
|
|
|
if (desc->mux_owner &&
|
|
!strcmp(desc->mux_owner, pinctrl_dev_get_name(pctldev)))
|
|
is_hog = true;
|
|
|
|
seq_printf(s, "pin %d (%s): %s %s%s", pin,
|
|
desc->name ? desc->name : "unnamed",
|
|
desc->mux_owner ? desc->mux_owner
|
|
: "(MUX UNCLAIMED)",
|
|
desc->gpio_owner ? desc->gpio_owner
|
|
: "(GPIO UNCLAIMED)",
|
|
is_hog ? " (HOG)" : "");
|
|
|
|
if (desc->mux_setting)
|
|
seq_printf(s, " function %s group %s\n",
|
|
pmxops->get_function_name(pctldev,
|
|
desc->mux_setting->func),
|
|
pctlops->get_group_name(pctldev,
|
|
desc->mux_setting->group));
|
|
else
|
|
seq_printf(s, "\n");
|
|
}
|
|
|
|
mutex_unlock(&pctldev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void pinmux_show_map(struct seq_file *s, struct pinctrl_map const *map)
|
|
{
|
|
seq_printf(s, "group %s\nfunction %s\n",
|
|
map->data.mux.group ? map->data.mux.group : "(default)",
|
|
map->data.mux.function);
|
|
}
|
|
|
|
void pinmux_show_setting(struct seq_file *s,
|
|
struct pinctrl_setting const *setting)
|
|
{
|
|
struct pinctrl_dev *pctldev = setting->pctldev;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
|
|
|
|
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_functions_show, inode->i_private);
|
|
}
|
|
|
|
static int pinmux_pins_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, pinmux_pins_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations pinmux_functions_ops = {
|
|
.open = pinmux_functions_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static const struct file_operations pinmux_pins_ops = {
|
|
.open = pinmux_pins_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
void pinmux_init_device_debugfs(struct dentry *devroot,
|
|
struct pinctrl_dev *pctldev)
|
|
{
|
|
debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO,
|
|
devroot, pctldev, &pinmux_functions_ops);
|
|
debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO,
|
|
devroot, pctldev, &pinmux_pins_ops);
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_FS */
|