- 根目录:
- drivers
- pinctrl
- pinconf.c
/*
* 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 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_dbg(pctldev->dev,
"cannot get pin configuration, .pin_config_get missing in driver\n");
return -ENOTSUPP;
}
return ops->pin_config_get(pctldev, pin, config);
}
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_dbg(pctldev->dev, "cannot get configuration for pin "
"group, missing group config get function in "
"driver\n");
ret = -ENOTSUPP;
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;
}
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 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;
}
ret = ops->pin_config_set(pctldev,
setting->data.configs.group_or_pin,
setting->data.configs.configs,
setting->data.configs.num_configs);
if (ret < 0) {
dev_err(pctldev->dev,
"pin_config_set op failed for pin %d\n",
setting->data.configs.group_or_pin);
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;
}
ret = ops->pin_config_group_set(pctldev,
setting->data.configs.group_or_pin,
setting->data.configs.configs,
setting->data.configs.num_configs);
if (ret < 0) {
dev_err(pctldev->dev,
"pin_config_group_set op failed for group %d\n",
setting->data.configs.group_or_pin);
return ret;
}
break;
default:
return -EINVAL;
}
return 0;
}
#ifdef CONFIG_DEBUG_FS
static void pinconf_show_config(struct seq_file *s, struct pinctrl_dev *pctldev,
unsigned long *configs, unsigned num_configs)
{
const struct pinconf_ops *confops;
int i;
if (pctldev)
confops = pctldev->desc->confops;
else
confops = NULL;
for (i = 0; i < num_configs; i++) {
seq_puts(s, "config ");
if (confops && confops->pin_config_config_dbg_show)
confops->pin_config_config_dbg_show(pctldev, s,
configs[i]);
else
seq_printf(s, "%08lx", configs[i]);
seq_puts(s, "\n");
}
}
void pinconf_show_map(struct seq_file *s, struct pinctrl_map const *map)
{
struct pinctrl_dev *pctldev;
pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
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);
pinconf_show_config(s, pctldev, map->data.configs.configs,
map->data.configs.num_configs);
}
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;
struct pin_desc *desc;
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.
*/
pinconf_show_config(s, pctldev, setting->data.configs.configs,
setting->data.configs.num_configs);
}
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_pins(pctldev, s, NULL, 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;
unsigned i, pin;
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_pins(pctldev, s, gname, 0);
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;
unsigned ngroups = pctlops->get_groups_count(pctldev);
unsigned selector = 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;
const struct pinctrl_map *found = NULL;
struct pinctrl_dev *pctldev;
struct dbg_cfg *dbg = &pinconf_dbg_conf;
int i;
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;
if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
/* We found the right pin */
found = map;
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;
}
pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
seq_printf(s, "Dev %s has config of %s in state %s:\n",
dbg->dev_name, dbg->pin_name, dbg->state_name);
pinconf_show_config(s, pctldev, found->data.configs.configs,
found->data.configs.num_configs);
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> <devicename> <state> <name> <newvalue>
* modify is literal string, alternatives like add/delete not supported yet
* <config> is the configuration to be changed. Supported configs are
* "config_pin" or "config_group", alternatives like config_mux are not
* supported yet.
* <devicename> <state> <name> 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;
const struct pinctrl_map *found = NULL;
struct pinctrl_dev *pctldev;
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];
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" and "config_group"
* types are supported so far
*/
token = strsep(&b, " ");
if (!token)
return -EINVAL;
if (!strcmp(token, "config_pin"))
dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
else if (!strcmp(token, "config_group"))
dbg->map_type = PIN_MAP_TYPE_CONFIGS_GROUP;
else
return -EINVAL;
/* 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 = map;
break;
}
}
if (!found) {
count = -EINVAL;
goto exit;
}
pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
if (pctldev)
confops = pctldev->desc->confops;
if (confops && confops->pin_config_dbg_parse_modify) {
configs = &found->data.configs;
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