| /* |
| * Core driver for the pin config portions of the pin control subsystem |
| * |
| * Copyright (C) 2011 ST-Ericsson SA |
| * Written on behalf of Linaro for ST-Ericsson |
| * |
| * Author: Linus Walleij <linus.walleij@linaro.org> |
| * |
| * License terms: GNU General Public License (GPL) version 2 |
| */ |
| #define pr_fmt(fmt) "pinconfig core: " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/slab.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/uaccess.h> |
| #include <linux/pinctrl/machine.h> |
| #include <linux/pinctrl/pinctrl.h> |
| #include <linux/pinctrl/pinconf.h> |
| #include "core.h" |
| #include "pinconf.h" |
| |
| int pinconf_check_ops(struct pinctrl_dev *pctldev) |
| { |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| |
| /* We must be able to read out pin status */ |
| if (!ops->pin_config_get && !ops->pin_config_group_get) { |
| dev_err(pctldev->dev, |
| "pinconf must be able to read out pin status\n"); |
| return -EINVAL; |
| } |
| /* We have to be able to config the pins in SOME way */ |
| if (!ops->pin_config_set && !ops->pin_config_group_set) { |
| dev_err(pctldev->dev, |
| "pinconf has to be able to set a pins config\n"); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| int pinconf_validate_map(struct pinctrl_map const *map, int i) |
| { |
| if (!map->data.configs.group_or_pin) { |
| pr_err("failed to register map %s (%d): no group/pin given\n", |
| map->name, i); |
| return -EINVAL; |
| } |
| |
| if (!map->data.configs.num_configs || |
| !map->data.configs.configs) { |
| pr_err("failed to register map %s (%d): no configs given\n", |
| map->name, i); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin, |
| unsigned long *config) |
| { |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| |
| if (!ops || !ops->pin_config_get) { |
| dev_err(pctldev->dev, "cannot get pin configuration, missing " |
| "pin_config_get() function in driver\n"); |
| return -EINVAL; |
| } |
| |
| return ops->pin_config_get(pctldev, pin, config); |
| } |
| |
| /** |
| * pin_config_get() - get the configuration of a single pin parameter |
| * @dev_name: name of the pin controller device for this pin |
| * @name: name of the pin to get the config for |
| * @config: the config pointed to by this argument will be filled in with the |
| * current pin state, it can be used directly by drivers as a numeral, or |
| * it can be dereferenced to any struct. |
| */ |
| int pin_config_get(const char *dev_name, const char *name, |
| unsigned long *config) |
| { |
| struct pinctrl_dev *pctldev; |
| int pin; |
| |
| pctldev = get_pinctrl_dev_from_devname(dev_name); |
| if (!pctldev) { |
| pin = -EINVAL; |
| return pin; |
| } |
| |
| mutex_lock(&pctldev->mutex); |
| |
| pin = pin_get_from_name(pctldev, name); |
| if (pin < 0) |
| goto unlock; |
| |
| pin = pin_config_get_for_pin(pctldev, pin, config); |
| |
| unlock: |
| mutex_unlock(&pctldev->mutex); |
| return pin; |
| } |
| EXPORT_SYMBOL(pin_config_get); |
| |
| static int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin, |
| unsigned long config) |
| { |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| int ret; |
| |
| if (!ops || !ops->pin_config_set) { |
| dev_err(pctldev->dev, "cannot configure pin, missing " |
| "config function in driver\n"); |
| return -EINVAL; |
| } |
| |
| ret = ops->pin_config_set(pctldev, pin, config); |
| if (ret) { |
| dev_err(pctldev->dev, |
| "unable to set pin configuration on pin %d\n", pin); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * pin_config_set() - set the configuration of a single pin parameter |
| * @dev_name: name of pin controller device for this pin |
| * @name: name of the pin to set the config for |
| * @config: the config in this argument will contain the desired pin state, it |
| * can be used directly by drivers as a numeral, or it can be dereferenced |
| * to any struct. |
| */ |
| int pin_config_set(const char *dev_name, const char *name, |
| unsigned long config) |
| { |
| struct pinctrl_dev *pctldev; |
| int pin, ret; |
| |
| pctldev = get_pinctrl_dev_from_devname(dev_name); |
| if (!pctldev) { |
| ret = -EINVAL; |
| return ret; |
| } |
| |
| mutex_lock(&pctldev->mutex); |
| |
| pin = pin_get_from_name(pctldev, name); |
| if (pin < 0) { |
| ret = pin; |
| goto unlock; |
| } |
| |
| ret = pin_config_set_for_pin(pctldev, pin, config); |
| |
| unlock: |
| mutex_unlock(&pctldev->mutex); |
| return ret; |
| } |
| EXPORT_SYMBOL(pin_config_set); |
| |
| int pin_config_group_get(const char *dev_name, const char *pin_group, |
| unsigned long *config) |
| { |
| struct pinctrl_dev *pctldev; |
| const struct pinconf_ops *ops; |
| int selector, ret; |
| |
| pctldev = get_pinctrl_dev_from_devname(dev_name); |
| if (!pctldev) { |
| ret = -EINVAL; |
| return ret; |
| } |
| |
| mutex_lock(&pctldev->mutex); |
| |
| ops = pctldev->desc->confops; |
| |
| if (!ops || !ops->pin_config_group_get) { |
| dev_err(pctldev->dev, "cannot get configuration for pin " |
| "group, missing group config get function in " |
| "driver\n"); |
| ret = -EINVAL; |
| goto unlock; |
| } |
| |
| selector = pinctrl_get_group_selector(pctldev, pin_group); |
| if (selector < 0) { |
| ret = selector; |
| goto unlock; |
| } |
| |
| ret = ops->pin_config_group_get(pctldev, selector, config); |
| |
| unlock: |
| mutex_unlock(&pctldev->mutex); |
| return ret; |
| } |
| EXPORT_SYMBOL(pin_config_group_get); |
| |
| int pin_config_group_set(const char *dev_name, const char *pin_group, |
| unsigned long config) |
| { |
| struct pinctrl_dev *pctldev; |
| const struct pinconf_ops *ops; |
| const struct pinctrl_ops *pctlops; |
| int selector; |
| const unsigned *pins; |
| unsigned num_pins; |
| int ret; |
| int i; |
| |
| pctldev = get_pinctrl_dev_from_devname(dev_name); |
| if (!pctldev) { |
| ret = -EINVAL; |
| return ret; |
| } |
| |
| mutex_lock(&pctldev->mutex); |
| |
| ops = pctldev->desc->confops; |
| pctlops = pctldev->desc->pctlops; |
| |
| if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) { |
| dev_err(pctldev->dev, "cannot configure pin group, missing " |
| "config function in driver\n"); |
| ret = -EINVAL; |
| goto unlock; |
| } |
| |
| selector = pinctrl_get_group_selector(pctldev, pin_group); |
| if (selector < 0) { |
| ret = selector; |
| goto unlock; |
| } |
| |
| ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins); |
| if (ret) { |
| dev_err(pctldev->dev, "cannot configure pin group, error " |
| "getting pins\n"); |
| goto unlock; |
| } |
| |
| /* |
| * If the pin controller supports handling entire groups we use that |
| * capability. |
| */ |
| if (ops->pin_config_group_set) { |
| ret = ops->pin_config_group_set(pctldev, selector, config); |
| /* |
| * If the pin controller prefer that a certain group be handled |
| * pin-by-pin as well, it returns -EAGAIN. |
| */ |
| if (ret != -EAGAIN) |
| goto unlock; |
| } |
| |
| /* |
| * If the controller cannot handle entire groups, we configure each pin |
| * individually. |
| */ |
| if (!ops->pin_config_set) { |
| ret = 0; |
| goto unlock; |
| } |
| |
| for (i = 0; i < num_pins; i++) { |
| ret = ops->pin_config_set(pctldev, pins[i], config); |
| if (ret < 0) |
| goto unlock; |
| } |
| |
| ret = 0; |
| |
| unlock: |
| mutex_unlock(&pctldev->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(pin_config_group_set); |
| |
| int pinconf_map_to_setting(struct pinctrl_map const *map, |
| struct pinctrl_setting *setting) |
| { |
| struct pinctrl_dev *pctldev = setting->pctldev; |
| int pin; |
| |
| switch (setting->type) { |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| pin = pin_get_from_name(pctldev, |
| map->data.configs.group_or_pin); |
| if (pin < 0) { |
| dev_err(pctldev->dev, "could not map pin config for \"%s\"", |
| map->data.configs.group_or_pin); |
| return pin; |
| } |
| setting->data.configs.group_or_pin = pin; |
| break; |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| pin = pinctrl_get_group_selector(pctldev, |
| map->data.configs.group_or_pin); |
| if (pin < 0) { |
| dev_err(pctldev->dev, "could not map group config for \"%s\"", |
| map->data.configs.group_or_pin); |
| return pin; |
| } |
| setting->data.configs.group_or_pin = pin; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| setting->data.configs.num_configs = map->data.configs.num_configs; |
| setting->data.configs.configs = map->data.configs.configs; |
| |
| return 0; |
| } |
| |
| void pinconf_free_setting(struct pinctrl_setting const *setting) |
| { |
| } |
| |
| int pinconf_apply_setting(struct pinctrl_setting const *setting) |
| { |
| struct pinctrl_dev *pctldev = setting->pctldev; |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| int i, ret; |
| |
| if (!ops) { |
| dev_err(pctldev->dev, "missing confops\n"); |
| return -EINVAL; |
| } |
| |
| switch (setting->type) { |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| if (!ops->pin_config_set) { |
| dev_err(pctldev->dev, "missing pin_config_set op\n"); |
| return -EINVAL; |
| } |
| for (i = 0; i < setting->data.configs.num_configs; i++) { |
| ret = ops->pin_config_set(pctldev, |
| setting->data.configs.group_or_pin, |
| setting->data.configs.configs[i]); |
| if (ret < 0) { |
| dev_err(pctldev->dev, |
| "pin_config_set op failed for pin %d config %08lx\n", |
| setting->data.configs.group_or_pin, |
| setting->data.configs.configs[i]); |
| return ret; |
| } |
| } |
| break; |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| if (!ops->pin_config_group_set) { |
| dev_err(pctldev->dev, |
| "missing pin_config_group_set op\n"); |
| return -EINVAL; |
| } |
| for (i = 0; i < setting->data.configs.num_configs; i++) { |
| ret = ops->pin_config_group_set(pctldev, |
| setting->data.configs.group_or_pin, |
| setting->data.configs.configs[i]); |
| if (ret < 0) { |
| dev_err(pctldev->dev, |
| "pin_config_group_set op failed for group %d config %08lx\n", |
| setting->data.configs.group_or_pin, |
| setting->data.configs.configs[i]); |
| return ret; |
| } |
| } |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| |
| void pinconf_show_map(struct seq_file *s, struct pinctrl_map const *map) |
| { |
| struct pinctrl_dev *pctldev; |
| const struct pinconf_ops *confops; |
| int i; |
| |
| pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); |
| if (pctldev) |
| confops = pctldev->desc->confops; |
| else |
| confops = NULL; |
| |
| switch (map->type) { |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| seq_printf(s, "pin "); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| seq_printf(s, "group "); |
| break; |
| default: |
| break; |
| } |
| |
| seq_printf(s, "%s\n", map->data.configs.group_or_pin); |
| |
| for (i = 0; i < map->data.configs.num_configs; i++) { |
| seq_printf(s, "config "); |
| if (confops && confops->pin_config_config_dbg_show) |
| confops->pin_config_config_dbg_show(pctldev, s, |
| map->data.configs.configs[i]); |
| else |
| seq_printf(s, "%08lx", map->data.configs.configs[i]); |
| seq_printf(s, "\n"); |
| } |
| } |
| |
| void pinconf_show_setting(struct seq_file *s, |
| struct pinctrl_setting const *setting) |
| { |
| struct pinctrl_dev *pctldev = setting->pctldev; |
| const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
| const struct pinconf_ops *confops = pctldev->desc->confops; |
| struct pin_desc *desc; |
| int i; |
| |
| switch (setting->type) { |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| desc = pin_desc_get(setting->pctldev, |
| setting->data.configs.group_or_pin); |
| seq_printf(s, "pin %s (%d)", |
| desc->name ? desc->name : "unnamed", |
| setting->data.configs.group_or_pin); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| seq_printf(s, "group %s (%d)", |
| pctlops->get_group_name(pctldev, |
| setting->data.configs.group_or_pin), |
| setting->data.configs.group_or_pin); |
| break; |
| default: |
| break; |
| } |
| |
| /* |
| * FIXME: We should really get the pin controler to dump the config |
| * values, so they can be decoded to something meaningful. |
| */ |
| for (i = 0; i < setting->data.configs.num_configs; i++) { |
| seq_printf(s, " "); |
| if (confops && confops->pin_config_config_dbg_show) |
| confops->pin_config_config_dbg_show(pctldev, s, |
| setting->data.configs.configs[i]); |
| else |
| seq_printf(s, "%08lx", |
| setting->data.configs.configs[i]); |
| } |
| |
| seq_printf(s, "\n"); |
| } |
| |
| static void pinconf_dump_pin(struct pinctrl_dev *pctldev, |
| struct seq_file *s, int pin) |
| { |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| |
| /* no-op when not using generic pin config */ |
| pinconf_generic_dump_pin(pctldev, s, pin); |
| if (ops && ops->pin_config_dbg_show) |
| ops->pin_config_dbg_show(pctldev, s, pin); |
| } |
| |
| static int pinconf_pins_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev = s->private; |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| unsigned i, pin; |
| |
| if (!ops || !ops->pin_config_get) |
| return 0; |
| |
| seq_puts(s, "Pin config settings per pin\n"); |
| seq_puts(s, "Format: pin (name): configs\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; |
| |
| pin = pctldev->desc->pins[i].number; |
| desc = pin_desc_get(pctldev, pin); |
| /* Skip if we cannot search the pin */ |
| if (desc == NULL) |
| continue; |
| |
| seq_printf(s, "pin %d (%s):", pin, |
| desc->name ? desc->name : "unnamed"); |
| |
| pinconf_dump_pin(pctldev, s, pin); |
| |
| seq_printf(s, "\n"); |
| } |
| |
| mutex_unlock(&pctldev->mutex); |
| |
| return 0; |
| } |
| |
| static void pinconf_dump_group(struct pinctrl_dev *pctldev, |
| struct seq_file *s, unsigned selector, |
| const char *gname) |
| { |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| |
| /* no-op when not using generic pin config */ |
| pinconf_generic_dump_group(pctldev, s, gname); |
| if (ops && ops->pin_config_group_dbg_show) |
| ops->pin_config_group_dbg_show(pctldev, s, selector); |
| } |
| |
| static int pinconf_groups_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev = s->private; |
| const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| unsigned ngroups = pctlops->get_groups_count(pctldev); |
| unsigned selector = 0; |
| |
| if (!ops || !ops->pin_config_group_get) |
| return 0; |
| |
| seq_puts(s, "Pin config settings per pin group\n"); |
| seq_puts(s, "Format: group (name): configs\n"); |
| |
| while (selector < ngroups) { |
| const char *gname = pctlops->get_group_name(pctldev, selector); |
| |
| seq_printf(s, "%u (%s):", selector, gname); |
| pinconf_dump_group(pctldev, s, selector, gname); |
| seq_printf(s, "\n"); |
| |
| selector++; |
| } |
| |
| return 0; |
| } |
| |
| static int pinconf_pins_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, pinconf_pins_show, inode->i_private); |
| } |
| |
| static int pinconf_groups_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, pinconf_groups_show, inode->i_private); |
| } |
| |
| static const struct file_operations pinconf_pins_ops = { |
| .open = pinconf_pins_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static const struct file_operations pinconf_groups_ops = { |
| .open = pinconf_groups_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| #define MAX_NAME_LEN 15 |
| |
| struct dbg_cfg { |
| enum pinctrl_map_type map_type; |
| char dev_name[MAX_NAME_LEN+1]; |
| char state_name[MAX_NAME_LEN+1]; |
| char pin_name[MAX_NAME_LEN+1]; |
| }; |
| |
| /* |
| * Goal is to keep this structure as global in order to simply read the |
| * pinconf-config file after a write to check config is as expected |
| */ |
| static struct dbg_cfg pinconf_dbg_conf; |
| |
| /** |
| * pinconf_dbg_config_print() - display the pinctrl config from the pinctrl |
| * map, of the dev/pin/state that was last written to pinconf-config file. |
| * @s: string filled in with config description |
| * @d: not used |
| */ |
| static int pinconf_dbg_config_print(struct seq_file *s, void *d) |
| { |
| struct pinctrl_maps *maps_node; |
| const struct pinctrl_map *map; |
| struct pinctrl_dev *pctldev = NULL; |
| const struct pinconf_ops *confops = NULL; |
| const struct pinctrl_map_configs *configs; |
| struct dbg_cfg *dbg = &pinconf_dbg_conf; |
| int i, j; |
| bool found = false; |
| unsigned long config; |
| |
| mutex_lock(&pinctrl_maps_mutex); |
| |
| /* Parse the pinctrl map and look for the elected pin/state */ |
| for_each_maps(maps_node, i, map) { |
| if (map->type != dbg->map_type) |
| continue; |
| if (strcmp(map->dev_name, dbg->dev_name)) |
| continue; |
| if (strcmp(map->name, dbg->state_name)) |
| continue; |
| |
| for (j = 0; j < map->data.configs.num_configs; j++) { |
| if (!strcmp(map->data.configs.group_or_pin, |
| dbg->pin_name)) { |
| /* |
| * We found the right pin / state, read the |
| * config and he pctldev for later use |
| */ |
| configs = &map->data.configs; |
| pctldev = get_pinctrl_dev_from_devname |
| (map->ctrl_dev_name); |
| found = true; |
| break; |
| } |
| } |
| } |
| |
| if (!found) { |
| seq_printf(s, "No config found for dev/state/pin, expected:\n"); |
| seq_printf(s, "Searched dev:%s\n", dbg->dev_name); |
| seq_printf(s, "Searched state:%s\n", dbg->state_name); |
| seq_printf(s, "Searched pin:%s\n", dbg->pin_name); |
| seq_printf(s, "Use: modify config_pin <devname> "\ |
| "<state> <pinname> <value>\n"); |
| goto exit; |
| } |
| |
| config = *(configs->configs); |
| seq_printf(s, "Dev %s has config of %s in state %s: 0x%08lX\n", |
| dbg->dev_name, dbg->pin_name, |
| dbg->state_name, config); |
| |
| if (pctldev) |
| confops = pctldev->desc->confops; |
| |
| if (confops && confops->pin_config_config_dbg_show) |
| confops->pin_config_config_dbg_show(pctldev, s, config); |
| |
| exit: |
| mutex_unlock(&pinctrl_maps_mutex); |
| |
| return 0; |
| } |
| |
| /** |
| * pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl |
| * map, of a dev/pin/state entry based on user entries to pinconf-config |
| * @user_buf: contains the modification request with expected format: |
| * modify config_pin <devicename> <state> <pinname> <newvalue> |
| * modify is literal string, alternatives like add/delete not supported yet |
| * config_pin is literal, alternatives like config_mux not supported yet |
| * <devicename> <state> <pinname> are values that should match the pinctrl-maps |
| * <newvalue> reflects the new config and is driver dependant |
| */ |
| static ssize_t pinconf_dbg_config_write(struct file *file, |
| const char __user *user_buf, size_t count, loff_t *ppos) |
| { |
| struct pinctrl_maps *maps_node; |
| const struct pinctrl_map *map; |
| struct pinctrl_dev *pctldev = NULL; |
| const struct pinconf_ops *confops = NULL; |
| struct dbg_cfg *dbg = &pinconf_dbg_conf; |
| const struct pinctrl_map_configs *configs; |
| char config[MAX_NAME_LEN+1]; |
| bool found = false; |
| char buf[128]; |
| char *b = &buf[0]; |
| int buf_size; |
| char *token; |
| int i; |
| |
| /* Get userspace string and assure termination */ |
| buf_size = min(count, (sizeof(buf)-1)); |
| if (copy_from_user(buf, user_buf, buf_size)) |
| return -EFAULT; |
| buf[buf_size] = 0; |
| |
| /* |
| * need to parse entry and extract parameters: |
| * modify configs_pin devicename state pinname newvalue |
| */ |
| |
| /* Get arg: 'modify' */ |
| token = strsep(&b, " "); |
| if (!token) |
| return -EINVAL; |
| if (strcmp(token, "modify")) |
| return -EINVAL; |
| |
| /* Get arg type: "config_pin" type supported so far */ |
| token = strsep(&b, " "); |
| if (!token) |
| return -EINVAL; |
| if (strcmp(token, "config_pin")) |
| return -EINVAL; |
| dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN; |
| |
| /* get arg 'device_name' */ |
| token = strsep(&b, " "); |
| if (token == NULL) |
| return -EINVAL; |
| if (strlen(token) >= MAX_NAME_LEN) |
| return -EINVAL; |
| strncpy(dbg->dev_name, token, MAX_NAME_LEN); |
| |
| /* get arg 'state_name' */ |
| token = strsep(&b, " "); |
| if (token == NULL) |
| return -EINVAL; |
| if (strlen(token) >= MAX_NAME_LEN) |
| return -EINVAL; |
| strncpy(dbg->state_name, token, MAX_NAME_LEN); |
| |
| /* get arg 'pin_name' */ |
| token = strsep(&b, " "); |
| if (token == NULL) |
| return -EINVAL; |
| if (strlen(token) >= MAX_NAME_LEN) |
| return -EINVAL; |
| strncpy(dbg->pin_name, token, MAX_NAME_LEN); |
| |
| /* get new_value of config' */ |
| token = strsep(&b, " "); |
| if (token == NULL) |
| return -EINVAL; |
| if (strlen(token) >= MAX_NAME_LEN) |
| return -EINVAL; |
| strncpy(config, token, MAX_NAME_LEN); |
| |
| mutex_lock(&pinctrl_maps_mutex); |
| |
| /* Parse the pinctrl map and look for the selected dev/state/pin */ |
| for_each_maps(maps_node, i, map) { |
| if (strcmp(map->dev_name, dbg->dev_name)) |
| continue; |
| if (map->type != dbg->map_type) |
| continue; |
| if (strcmp(map->name, dbg->state_name)) |
| continue; |
| |
| /* we found the right pin / state, so overwrite config */ |
| if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) { |
| found = true; |
| pctldev = get_pinctrl_dev_from_devname( |
| map->ctrl_dev_name); |
| configs = &map->data.configs; |
| break; |
| } |
| } |
| |
| if (!found) { |
| count = -EINVAL; |
| goto exit; |
| } |
| |
| if (pctldev) |
| confops = pctldev->desc->confops; |
| |
| if (confops && confops->pin_config_dbg_parse_modify) { |
| for (i = 0; i < configs->num_configs; i++) { |
| confops->pin_config_dbg_parse_modify(pctldev, |
| config, |
| &configs->configs[i]); |
| } |
| } |
| |
| exit: |
| mutex_unlock(&pinctrl_maps_mutex); |
| |
| return count; |
| } |
| |
| static int pinconf_dbg_config_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, pinconf_dbg_config_print, inode->i_private); |
| } |
| |
| static const struct file_operations pinconf_dbg_pinconfig_fops = { |
| .open = pinconf_dbg_config_open, |
| .write = pinconf_dbg_config_write, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| .owner = THIS_MODULE, |
| }; |
| |
| void pinconf_init_device_debugfs(struct dentry *devroot, |
| struct pinctrl_dev *pctldev) |
| { |
| debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO, |
| devroot, pctldev, &pinconf_pins_ops); |
| debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO, |
| devroot, pctldev, &pinconf_groups_ops); |
| debugfs_create_file("pinconf-config", (S_IRUGO | S_IWUSR | S_IWGRP), |
| devroot, pctldev, &pinconf_dbg_pinconfig_fops); |
| } |
| |
| #endif |