alistair23-linux/drivers/pinctrl/pinconf-generic.c
Laxman Dewangan 3287c24088 pinctrl: utils : add support to pass config type in generic util APIs
Add support to pass the config type like GROUP or PIN when using
the utils or generic pin configuration APIs. This will make the
APIs more generic.

Added additional inline APIs such that it can be use directly as
callback for the pinctrl_ops.

Changes from V1:
- Remove separate implementation for pins and group for
  pinctrl_utils_dt_free_map and improve this function
  to support both i.e. PINS and GROUPs.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-08-23 08:56:32 +02:00

337 lines
9.1 KiB
C

/*
* Core driver for the generic 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) "generic 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/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/of.h>
#include "core.h"
#include "pinconf.h"
#include "pinctrl-utils.h"
#ifdef CONFIG_DEBUG_FS
struct pin_config_item {
const enum pin_config_param param;
const char * const display;
const char * const format;
};
#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
static struct pin_config_item conf_items[] = {
PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
"input bias pull to pin specific state", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA"),
PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec"),
PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"),
};
void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned pin)
{
const struct pinconf_ops *ops = pctldev->desc->confops;
int i;
if (!ops->is_generic)
return;
for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
unsigned long config;
int ret;
/* We want to check out this parameter */
config = pinconf_to_config_packed(conf_items[i].param, 0);
ret = pin_config_get_for_pin(pctldev, pin, &config);
/* These are legal errors */
if (ret == -EINVAL || ret == -ENOTSUPP)
continue;
if (ret) {
seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
continue;
}
/* Space between multiple configs */
seq_puts(s, " ");
seq_puts(s, conf_items[i].display);
/* Print unit if available */
if (conf_items[i].format &&
pinconf_to_config_argument(config) != 0)
seq_printf(s, " (%u %s)",
pinconf_to_config_argument(config),
conf_items[i].format);
}
}
void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
struct seq_file *s, const char *gname)
{
const struct pinconf_ops *ops = pctldev->desc->confops;
int i;
if (!ops->is_generic)
return;
for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
unsigned long config;
int ret;
/* We want to check out this parameter */
config = pinconf_to_config_packed(conf_items[i].param, 0);
ret = pin_config_group_get(dev_name(pctldev->dev), gname,
&config);
/* These are legal errors */
if (ret == -EINVAL || ret == -ENOTSUPP)
continue;
if (ret) {
seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
continue;
}
/* Space between multiple configs */
seq_puts(s, " ");
seq_puts(s, conf_items[i].display);
/* Print unit if available */
if (conf_items[i].format && config != 0)
seq_printf(s, " (%u %s)",
pinconf_to_config_argument(config),
conf_items[i].format);
}
}
void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned long config)
{
int i;
for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
if (pinconf_to_config_param(config) != conf_items[i].param)
continue;
seq_printf(s, "%s: 0x%x", conf_items[i].display,
pinconf_to_config_argument(config));
}
}
EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
#endif
#ifdef CONFIG_OF
struct pinconf_generic_dt_params {
const char * const property;
enum pin_config_param param;
u32 default_value;
};
static struct pinconf_generic_dt_params dt_params[] = {
{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
{ "output-low", PIN_CONFIG_OUTPUT, 0, },
{ "output-high", PIN_CONFIG_OUTPUT, 1, },
};
/**
* pinconf_generic_parse_dt_config()
* parse the config properties into generic pinconfig values.
* @np: node containing the pinconfig properties
* @configs: array with nconfigs entries containing the generic pinconf values
* @nconfigs: umber of configurations
*/
int pinconf_generic_parse_dt_config(struct device_node *np,
unsigned long **configs,
unsigned int *nconfigs)
{
unsigned long *cfg;
unsigned int ncfg = 0;
int ret;
int i;
u32 val;
if (!np)
return -EINVAL;
/* allocate a temporary array big enough to hold one of each option */
cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL);
if (!cfg)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
struct pinconf_generic_dt_params *par = &dt_params[i];
ret = of_property_read_u32(np, par->property, &val);
/* property not found */
if (ret == -EINVAL)
continue;
/* use default value, when no value is specified */
if (ret)
val = par->default_value;
pr_debug("found %s with value %u\n", par->property, val);
cfg[ncfg] = pinconf_to_config_packed(par->param, val);
ncfg++;
}
ret = 0;
/* no configs found at all */
if (ncfg == 0) {
*configs = NULL;
*nconfigs = 0;
goto out;
}
/*
* Now limit the number of configs to the real number of
* found properties.
*/
*configs = kzalloc(ncfg * sizeof(unsigned long), GFP_KERNEL);
if (!*configs) {
ret = -ENOMEM;
goto out;
}
memcpy(*configs, cfg, ncfg * sizeof(unsigned long));
*nconfigs = ncfg;
out:
kfree(cfg);
return ret;
}
int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
struct device_node *np, struct pinctrl_map **map,
unsigned *reserved_maps, unsigned *num_maps,
enum pinctrl_map_type type)
{
int ret;
const char *function;
struct device *dev = pctldev->dev;
unsigned long *configs = NULL;
unsigned num_configs = 0;
unsigned reserve;
struct property *prop;
const char *group;
ret = of_property_read_string(np, "function", &function);
if (ret < 0) {
/* EINVAL=missing, which is fine since it's optional */
if (ret != -EINVAL)
dev_err(dev,
"could not parse property ti,function\n");
function = NULL;
}
ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
if (ret < 0) {
dev_err(dev, "could not parse node property\n");
return ret;
}
reserve = 0;
if (function != NULL)
reserve++;
if (num_configs)
reserve++;
ret = of_property_count_strings(np, "pins");
if (ret < 0) {
dev_err(dev, "could not parse property ti,pins\n");
goto exit;
}
reserve *= ret;
ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
num_maps, reserve);
if (ret < 0)
goto exit;
of_property_for_each_string(np, "pins", prop, group) {
if (function) {
ret = pinctrl_utils_add_map_mux(pctldev, map,
reserved_maps, num_maps, group,
function);
if (ret < 0)
goto exit;
}
if (num_configs) {
ret = pinctrl_utils_add_map_configs(pctldev, map,
reserved_maps, num_maps, group, configs,
num_configs, type);
if (ret < 0)
goto exit;
}
}
ret = 0;
exit:
kfree(configs);
return ret;
}
EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config, struct pinctrl_map **map,
unsigned *num_maps, enum pinctrl_map_type type)
{
unsigned reserved_maps;
struct device_node *np;
int ret;
reserved_maps = 0;
*map = NULL;
*num_maps = 0;
for_each_child_of_node(np_config, np) {
ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
&reserved_maps, num_maps, type);
if (ret < 0) {
pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
return ret;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
#endif