diff options
Diffstat (limited to 'drivers/pinctrl')
| -rw-r--r-- | drivers/pinctrl/core.c | 120 |
1 files changed, 75 insertions, 45 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index feadf1c31133..50bcc511193e 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -7,6 +7,8 @@ * * 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 @@ -31,6 +33,18 @@ #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; +}; + +/** * struct pinctrl_hog - a list item to stash control hogs * @node: pin control hog list node * @map: map entry responsible for this hogging @@ -51,8 +65,14 @@ 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; +static DEFINE_MUTEX(pinctrl_maps_mutex); +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) { @@ -454,23 +474,17 @@ int pinctrl_gpio_direction_output(unsigned gpio) } 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) +static struct pinctrl *pinctrl_get_locked(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; + struct pinctrl_maps *maps_node; int i; + struct pinctrl_map const *map; /* We must have dev or ID or both */ if (!dev && !name) @@ -494,8 +508,7 @@ struct pinctrl *pinctrl_get(struct device *dev, const char *name) 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]; + for_each_maps(maps_node, i, map) { found_map = false; /* @@ -515,7 +528,6 @@ struct pinctrl *pinctrl_get(struct device *dev, const char *name) 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. @@ -574,6 +586,24 @@ struct pinctrl *pinctrl_get(struct device *dev, const char *name) return p; } + +/** + * 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 *p; + + mutex_lock(&pinctrl_maps_mutex); + p = pinctrl_get_locked(dev, name); + mutex_unlock(&pinctrl_maps_mutex); + + return p; +} EXPORT_SYMBOL_GPL(pinctrl_get); /** @@ -649,8 +679,8 @@ EXPORT_SYMBOL_GPL(pinctrl_disable); int pinctrl_register_mappings(struct pinctrl_map const *maps, unsigned num_maps) { - void *tmp_maps; int i; + struct pinctrl_maps *maps_node; pr_debug("add %d pinmux maps\n", num_maps); @@ -684,31 +714,23 @@ int pinctrl_register_mappings(struct pinctrl_map const *maps, 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; + maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL); + if (!maps_node) { + pr_err("failed to alloc struct pinctrl_maps\n"); + return -ENOMEM; + } - tmp_maps = krealloc(pinctrl_maps, - oldsize + newsize, GFP_KERNEL); - if (!tmp_maps) - return -ENOMEM; - memcpy((tmp_maps + oldsize), maps, newsize); + maps_node->num_maps = num_maps; + maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps, GFP_KERNEL); + if (!maps_node->maps) { + kfree(maps_node); + return -ENOMEM; } - pinctrl_maps = tmp_maps; - pinctrl_maps_num += num_maps; + mutex_lock(&pinctrl_maps_mutex); + list_add_tail(&maps_node->node, &pinctrl_maps); + mutex_unlock(&pinctrl_maps_mutex); + return 0; } @@ -724,7 +746,7 @@ static int pinctrl_hog_map(struct pinctrl_dev *pctldev, if (!hog) return -ENOMEM; - p = pinctrl_get(pctldev->dev, map->name); + p = pinctrl_get_locked(pctldev->dev, map->name); if (IS_ERR(p)) { kfree(hog); dev_err(pctldev->dev, @@ -768,23 +790,28 @@ int pinctrl_hog_maps(struct pinctrl_dev *pctldev) struct device *dev = pctldev->dev; const char *devname = dev_name(dev); int ret; + struct pinctrl_maps *maps_node; int i; + struct pinctrl_map const *map; 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]; - + mutex_lock(&pinctrl_maps_mutex); + for_each_maps(maps_node, i, map) { if (map->ctrl_dev_name && !strcmp(map->ctrl_dev_name, devname) && !strcmp(map->dev_name, devname)) { /* OK time to hog! */ ret = pinctrl_hog_map(pctldev, map); - if (ret) + if (ret) { + mutex_unlock(&pinctrl_maps_mutex); return ret; + } } } + mutex_unlock(&pinctrl_maps_mutex); + return 0; } @@ -900,13 +927,14 @@ static int pinctrl_gpioranges_show(struct seq_file *s, void *what) 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"); - for (i = 0; i < pinctrl_maps_num; i++) { - struct pinctrl_map const *map = &pinctrl_maps[i]; - + mutex_lock(&pinctrl_maps_mutex); + for_each_maps(maps_node, i, map) { seq_printf(s, "%s:\n", map->name); if (map->dev_name) seq_printf(s, " device: %s\n", @@ -919,6 +947,8 @@ static int pinctrl_maps_show(struct seq_file *s, void *what) seq_printf(s, " group: %s\n", map->group ? map->group : "(default)"); } + mutex_unlock(&pinctrl_maps_mutex); + return 0; } |