/*
* pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com
* Copyright (c) 2012 Linaro Ltd
* http://www.linaro.org
*
* Author: Thomas Abraham <thomas.ab@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This driver implements the Samsung pinctrl driver. It supports setting up of
* pinmux and pinconf configurations. The gpiolib interface is also included.
* External interrupt (gpio and wakeup) support are not included in this driver
* but provides extensions to which platform specific implementation of the gpio
* and wakeup interrupts can be hooked to.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include "core.h"
#include "pinctrl-samsung.h"
#define GROUP_SUFFIX "-grp"
#define GSUFFIX_LEN sizeof(GROUP_SUFFIX)
#define FUNCTION_SUFFIX "-mux"
#define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX)
/* list of all possible config options supported */
struct pin_config {
char *prop_cfg;
unsigned int cfg_type;
} pcfgs[] = {
{ "samsung,pin-pud", PINCFG_TYPE_PUD },
{ "samsung,pin-drv", PINCFG_TYPE_DRV },
{ "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
{ "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
};
/* check if the selector is a valid pin group selector */
static int samsung_get_group_count(struct pinctrl_dev *pctldev)
{
struct samsung_pinctrl_drv_data *drvdata;
drvdata = pinctrl_dev_get_drvdata(pctldev);
return drvdata->nr_groups;
}
/* return the name of the group selected by the group selector */
static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
struct samsung_pinctrl_drv_data *drvdata;
drvdata = pinctrl_dev_get_drvdata(pctldev);
return drvdata->pin_groups[selector].name;
}
/* return the pin numbers associated with the specified group */
static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
unsigned selector, const unsigned **pins, unsigned *num_pins)
{
struct samsung_pinctrl_drv_data *drvdata;
drvdata = pinctrl_dev_get_drvdata(pctldev);
*pins = drvdata->pin_groups[selector].pins;
*num_pins = drvdata->pin_groups[selector].num_pins;
return 0;
}
/* create pinctrl_map entries by parsing device tree nodes */
static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np, struct pinctrl_map **maps,
unsigned *nmaps)
{
struct device *dev = pctldev->dev;
struct pinctrl_map *map;
unsigned long *cfg = NULL;
char *gname, *fname;
int cfg_cnt = 0, map_cnt = 0, idx = 0;
/* count the number of config options specfied in the node */
for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
cfg_cnt++;
}
/*
* Find out the number of map entries to create. All the config options
* can be accomadated into a single config map entry.
*/
if (cfg_cnt)
map_cnt = 1;
if (of_find_property(np, "samsung,pin-function", NULL))
map_cnt++;
if (!map_cnt) {
dev_err(dev, "node %s does not have either config or function "
"configurations\n", np->name);
return -EINVAL;
}
/* Allocate memory for pin-map entries */
map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
if (!map) {
dev_err(dev, "could not alloc memory for pin-maps\n");
return -ENOMEM;
}
*nmaps = 0;
/*
* Allocate memory for pin group name. The pin group name is derived
* from the node name from which these map entries are be created.
*/
gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
if (!gname) {
dev_err(dev, "failed to alloc memory for group name\n");
goto free_map;
}
sprintf(gname, "%s%s", np->name, GROUP_SUFFIX);
/*
* don't have config options? then skip over to creating function
* map entries.
*/
if (!cfg_cnt)
goto skip_cfgs;
/* Allocate memory for config entries */
cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
if (!cfg) {
dev_err(dev, "failed to alloc memory for configs\n");
goto free_gname;
}
/* Prepare a list of config settings */
for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
u32 value;
if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
cfg[cfg_cnt++] =
PINCFG_PACK(pcfgs[idx].cfg_type, value);
}
/* create the config map entry */
map[*nmaps].data.configs.group_or_pin = gname;
map[*nmaps].data.configs.configs = cfg;
map[*nmaps].data.configs.num_configs = cfg_cnt;
map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
*nmaps += 1;
skip_cfgs:
/* create the function map entry */
if (of_find_property(np, "samsung,pin-function", NULL)) {
fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL);
if (!fname) {
dev_err(dev, "failed to alloc memory for func name\n");
goto free_cfg;
}
sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX);
map[*nmaps].data.mux.group = gname;
map[*nmaps].data.mux.function = fname;
map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
*nmaps += 1;
}
*maps = map;
return 0;
free_cfg:
kfree(cfg);
free_gname:
kfree(gname);
free_map:
kfree(map);
return -ENOMEM;
}
/* free the memory allocated to hold the pin-map table */
static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps)
{
int idx;
for (idx = 0; idx < num_maps; idx++) {
if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
kfree(map[idx].data.mux.function);
if (!idx)
kfree(map[idx].data.mux.group);
} else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
kfree(map[idx].data.configs.configs);
if (!idx)
kfree(map[idx].data.configs.group_or_pin);
}
};
kfree(map);
}
/* list of pinctrl callbacks for the pinctrl core */
static struct pinctrl_ops samsung_pctrl_ops = {
.get_groups_count = samsung_get_group_count,
.get_group_name = samsung_get_group_name,
.get_group_pins = samsung_get_group_pins,
.dt_node_to_map = samsung_dt_node_to_map,
.dt_free_map = samsung_dt_free_map,
};
/* check if the selector is a valid pin function selector */
static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
{
struct samsung_pinctrl_drv_data *drvdata;
drvdata = pinctrl_dev_get_drvdata(pctldev);
return drvdata->nr_functions;
}
/* return the name of the pin function specified */
static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
unsigned selector)
{
struct samsung_pinctrl_drv_data *drvdata;
drvdata = pinctrl_dev_get_drvdata(pctldev);
return drvdata->pmx_functions[selector].name;
}
/* return the groups associated for the specified function selector */
static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
unsigned selector, const char * const **groups,
unsigned * const num_groups)
{
struct samsung_pinctrl_drv_data *drvdata;
drvdata = pinctrl_dev_get_drvdata(pctldev);
*groups = drvdata->pmx_functions[selector].groups;
*num_groups = drvdata->pmx_functions[selector].num_groups;
return 0;
}
/*
* given a pin number that is local to a pin controller, find out the pin bank
* and the register base of the pin bank.
*/
static void pin_to_reg_bank(struct gpio_chip *gc, unsigned pin,
void __iomem **reg, u32 *offset,
struct samsung_pin_bank **bank)
{
struct samsung_pinctrl_drv_data *drvdata;
struct samsung_pin_bank *b;
drvdata = dev_get_drvdata(gc->dev);
b = drvdata->ctrl->pin_banks;
while ((pin >= b->pin_base) &&
((b->pin_base + b->nr_pins - 1) < pin))
b++;
*reg = drvdata->virt_base + b->pctl_offset;
*offset = pin - b->pin_base;
if (bank)
*bank = b;
/* some banks have two config registers in a single bank */
if (*offset * b->func_width > BITS_PER_LONG)
*reg += 4;
}
/* enable or disable a pinmux function */
static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
unsigned group, bool enable)
{
struct samsung_pinctrl_drv_data *drvdata;
const unsigned int *pins;
struct samsung_pin_bank *bank;
void __iomem *reg;
u32 mask, shift, data, pin_offset, cnt;
drvdata = pinctrl_dev_get_drvdata(pctldev);
pins = drvdata->pin_groups[group].pins;
/*
* for each pin in the pin group selected, program the correspoding pin
* pin function number in the config register.
*/
for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) {
pin_to_reg_bank(drvdata->gc, pins[cnt] - drvdata->ctrl->base,
®, &pin_offset, &bank);
mask = (1 << bank->func_width) - 1;
shift = pin_offset * bank->func_width;
data = readl(reg);
data &= ~(mask << shift);
if (enable)
data |= drvdata->pin_groups[group].func << shift;
writel(data, reg);
}
}
/* enable a specified pinmux by writing to registers */
static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
unsigned group)
{
samsung_pinmux_setup(pctldev, selector, group, true);
return 0;
}
/* disable a specified pinmux by writing to registers */
static void samsung_pinmux_disable(struct pinctrl_dev *pctldev,
unsigned selector, unsigned group)
{
samsung_pinmux_setup(pctldev, selector, group, false);
}
/*
* The calls to gpio_direction_output() and gpio_direction_input()
* leads to this function call (via the pinctrl_gpio_direction_{input|output}()
* function called from the gpiolib interface).
*/
static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned offset, bool input)
{
struct samsung_pin_bank *bank;
void __iomem *reg;
u32 data, pin_offset, mask, shift;
pin_to_reg_bank(range->gc, offset, ®, &pin_offset, &bank);
mask = (1 << bank->func_width) - 1;
shift = pin_offset * bank->func_width;
data = readl(reg);
data &= ~(mask << shift);
if (!input)
data |= FUNC_OUTPUT << shift;
writel(data, reg);
return 0;
}
/* list of pinmux callbacks for the pinmux vertical in pinctrl core */
static struct pinmux_ops samsung_pinmux_ops = {
.get_functions_count = samsung_get_functions_count,
.get_function_name = samsung_pinmux_get_fname,
.get_function_groups = samsung_pinmux_get_groups,
.enable = samsung_pinmux_enable,
.disable = samsung_pinmux_disable,
.gpio_set_direction = samsung_pinmux_gpio_set_direction,
};
/* set or get the pin config settings for a specified pin */
static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config, bool set)
{
struct samsung_pinctrl_drv_data *drvdata;
struct samsung_pin_bank *bank;
void __iomem *reg_base;
enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
u32 data, width, pin_offset, mask, shift;
u32 cfg_value, cfg_reg;
drvdata = pinctrl_dev_get_drvdata(pctldev);
pin_to_reg_bank(drvdata->gc, pin - drvdata->ctrl->base, ®_base,
&pin_offset, &bank);
switch (cfg_type) {
case PINCFG_TYPE_PUD:
width = bank->pud_width;
cfg_reg = PUD_REG;
break;
case PINCFG_TYPE_DRV:
width = bank->drv_width;
cfg_reg = DRV_REG;
break;
case PINCFG_TYPE_CON_PDN:
width = bank->conpdn_width;
cfg_reg = CONPDN_REG;
break;
case PINCFG_TYPE_PUD_PDN:
width = bank->pudpdn_width;
cfg_reg = PUDPDN_REG;
break;
default:
WARN_ON(1);
return -EINVAL;
}
mask = (1 << width) - 1;
shift = pin_offset * width;
data = readl(reg_base + cfg_reg);
if (set) {
cfg_value = PINCFG_UNPACK_VALUE(*config);
data &= ~(mask << shift);
data |= (cfg_value << shift);
writel(data, reg_base + cfg_reg);
} else {
data >>= shift;
data &= mask;
*config = PINCFG_PACK(cfg_type, data);
}
return 0;
}
/* set the pin config settings for a specified pin */
static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long config)
{
return samsung_pinconf_rw(pctldev, pin, &config, true);
}
/* get the pin config settings for a specified pin */
static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config)
{
return samsung_pinconf_rw(pctldev, pin, config, false);
}
/* set the pin config settings for a specified pin group */
static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
unsigned group, unsigned long config)
{
struct samsung_pinctrl_drv_data *drvdata;
const unsigned int *pins;
unsigned int cnt;
drvdata = pinctrl_dev_get_drvdata(pctldev);
pins = drvdata->pin_groups[group].pins;
for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
samsung_pinconf_set(pctldev, pins[cnt], config);
return 0;
}
/* get the pin config settings for a specified pin group */
static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
unsigned int group, unsigned long *config)
{
struct samsung_pinctrl_drv_data *drvdata;
const unsigned int *pins;
drvdata = pinctrl_dev_get_drvdata(pctldev);
pins = drvdata->pin_groups[group].pins;
samsung_pinconf_get(pctldev, pins[0], config);
return 0;
}
/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
static struct pinconf_ops samsung_pinconf_ops = {
.pin_config_get = samsung_pinconf_get,
.pin_config_set = samsung_pinconf_set,
.pin_config_group_get = samsung_pinconf_group_get,
.pin_config_group_set = samsung_pinconf_group_set,
};
/* gpiolib gpio_set callback function */
static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
{
void __iomem *reg;
u32 pin_offset, data;
pin_to_reg_bank(gc, offset, ®, &pin_offset, NULL);
data = readl(reg + DAT_REG);
data &= ~(1 << pin_offset);
if (value)
data |= 1 << pin_offset;
writel(data, reg + DAT_REG);
}
/* gpiolib gpio_get callback function */
static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
{
void __iomem *reg;
u32 pin_offset, data;
pin_to_reg_bank(gc, offset, ®, &pin_offset, NULL);
data = readl(reg + DAT_REG);
data >>= pin_offset;
data &= 1;
return data;
}
/*
* gpiolib gpio_direction_input callback function. The setting of the pin
* mux function as 'gpio input' will be handled by the pinctrl susbsystem
* interface.
*/
static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
return pinctrl_gpio_direction_input(gc->base + offset);
}
/*
* gpiolib gpio_direction_output callback function. The setting of the pin
* mux function as 'gpio output' will be handled by the pinctrl susbsystem
* interface.
*/
static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
int value)
{
samsung_gpio_set(gc, offset, value);
return pinctrl_gpio_direction_output(gc->base + offset);
}
/*
* Parse the pin names listed in the 'samsung,pins' property and convert it
* into a list of gpio numbers are create a pin group from it.
*/
static int __devinit samsung_pinctrl_parse_dt_pins(struct platform_device *pdev,
struct device_node *cfg_np, struct pinctrl_desc *pctl,
unsigned int **pin_list, unsigned int *npins)
{
struct device *dev = &pdev->dev;
struct property *prop;
struct pinctrl_pin_desc const *pdesc = pctl->pins;
unsigned int idx = 0, cnt;
const char *pin_name;
*npins = of_property_count_strings(cfg_np, "samsung,pins");
if (*npins < 0) {
dev_err(dev, "invalid pin list in %s node", cfg_np->name);
return -EINVAL;
}
*pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
if (!*pin_list) {
dev_err(dev, "failed to allocate memory for pin list\n");
return -ENOMEM;
}
of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) {
for (cnt = 0; cnt < pctl->npins; cnt++) {
if (pdesc[cnt].name) {
if (!strcmp(pin_name, pdesc[cnt].name)) {
(*pin_list)[idx++] = pdesc[cnt].number;
break;
}
}
}
if (cnt == pctl->npins) {
dev_err(dev, "pin %s not valid in %s node\n",
pin_name, cfg_np->name);
devm_kfree(dev, *pin_list);
return -EINVAL;
}
}
return 0;
}
/*
* Parse the information about all the available pin groups and pin functions
* from device node of the pin-controller. A pin group is formed with all
* the pins listed in the "samsung,pins" property.
*/
static int __devinit samsung_pinctrl_parse_dt(struct platform_device *pdev,
struct samsung_pinctrl_drv_data *drvdata)
{
struct device *dev = &pdev->dev;
struct device_node *dev_np = dev->of_node;
struct device_node *cfg_np;
struct samsung_pin_group *groups, *grp;
struct samsung_pmx_func *functions, *func;
unsigned *pin_list;
unsigned int npins, grp_cnt, func_idx = 0;
char *gname, *fname;
int ret;
grp_cnt = of_get_child_count(dev_np);
if (!grp_cnt)
return -EINVAL;
groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
if (!groups) {
dev_err(dev, "failed allocate memory for ping group list\n");
return -EINVAL;
}
grp = groups;
functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
if (!functions) {
dev_err(dev, "failed to allocate memory for function list\n");
return -EINVAL;
}
func = functions;
/*
* Iterate over all the child nodes of the pin controller node
* and create pin groups and pin function lists.
*/
for_each_child_of_node(dev_np, cfg_np) {
u32 function;
if (of_find_property(cfg_np, "interrupt-controller", NULL))
continue;
ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np,
&drvdata->pctl, &pin_list, &npins);
if (ret)
return ret;
/* derive pin group name from the node name */
gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
GFP_KERNEL);
if (!gname) {
dev_err(dev, "failed to alloc memory for group name\n");
return -ENOMEM;
}
sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX);
grp->name = gname;
grp->pins = pin_list;
grp->num_pins = npins;
of_property_read_u32(cfg_np, "samsung,pin-function", &function);
grp->func = function;
grp++;
if (!of_find_property(cfg_np, "samsung,pin-function", NULL))
continue;
/* derive function name from the node name */
fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
GFP_KERNEL);
if (!fname) {
dev_err(dev, "failed to alloc memory for func name\n");
return -ENOMEM;
}
sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX);
func->name = fname;
func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
if (!func->groups) {
dev_err(dev, "failed to alloc memory for group list "
"in pin function");
return -ENOMEM;
}
func->groups[0] = gname;
func->num_groups = 1;
func++;
func_idx++;
}
drvdata->pin_groups = groups;
drvdata->nr_groups = grp_cnt;
drvdata->pmx_functions = functions;
drvdata->nr_functions = func_idx;
return 0;
}
/* register the pinctrl interface with the pinctrl subsystem */
static int __devinit samsung_pinctrl_register(struct platform_device *pdev,
struct samsung_pinctrl_drv_data *drvdata)
{
struct pinctrl_desc *ctrldesc = &drvdata->pctl;
struct pinctrl_pin_desc *pindesc, *pdesc;
struct samsung_pin_bank *pin_bank;
char *pin_names;
int pin, bank, ret;
ctrldesc->name = "samsung-pinctrl";
ctrldesc->owner = THIS_MODULE;
ctrldesc->pctlops = &samsung_pctrl_ops;
ctrldesc->pmxops = &samsung_pinmux_ops;
ctrldesc->confops = &samsung_pinconf_ops;
pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
drvdata->ctrl->nr_pins, GFP_KERNEL);
if (!pindesc) {
dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
return -ENOMEM;
}
ctrldesc->pins = pindesc;
ctrldesc->npins = drvdata->ctrl->nr_pins;
ctrldesc->npins = drvdata->ctrl->nr_pins;
/* dynamically populate the pin number and pin name for pindesc */
for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
pdesc->number = pin + drvdata->ctrl->base;
/*
* allocate space for storing the dynamically generated names for all
* the pins which belong to this pin-controller.
*/
pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
drvdata->ctrl->nr_pins, GFP_KERNEL);
if (!pin_names) {
dev_err(&pdev->dev, "mem alloc for pin names failed\n");
return -ENOMEM;
}
/* for each pin, the name of the pin is pin-bank name + pin number */
for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
pin_bank = &drvdata->ctrl->pin_banks[bank];
for (pin = 0; pin < pin_bank->nr_pins; pin++) {
sprintf(pin_names, "%s-%d", pin_bank->name, pin);
pdesc = pindesc + pin_bank->pin_base + pin;
pdesc->name = pin_names;
pin_names += PIN_NAME_LENGTH;
}
}
drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
if (!drvdata->pctl_dev) {
dev_err(&pdev->dev, "could not register pinctrl driver\n");
return -EINVAL;
}
drvdata->grange.name = "samsung-pctrl-gpio-range";
drvdata->grange.id = 0;
drvdata->grange.base = drvdata->ctrl->base;
drvdata->grange.npins = drvdata->ctrl->nr_pins;
drvdata->grange.gc = drvdata->gc;
pinctrl_add_gpio_range(drvdata->pctl_dev, &drvdata->grange);
ret = samsung_pinctrl_parse_dt(pdev, drvdata);
if (ret) {
pinctrl_unregister(drvdata->pctl_dev);
return ret;
}
return 0;
}
/* register the gpiolib interface with the gpiolib subsystem */
static int __devinit samsung_gpiolib_register(struct platform_device *pdev,
struct samsung_pinctrl_drv_data *drvdata)
{
struct gpio_chip *gc;
int ret;
gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
if (!gc) {
dev_err(&pdev->dev, "mem alloc for gpio_chip failed\n");
return -ENOMEM;
}
drvdata->gc = gc;
gc->base = drvdata->ctrl->base;
gc->ngpio = drvdata->ctrl->nr_pins;
gc->dev = &pdev->dev;
gc->set = samsung_gpio_set;
gc->get = samsung_gpio_get;
gc->direction_input = samsung_gpio_direction_input;
gc->direction_output = samsung_gpio_direction_output;
gc->label = drvdata->ctrl->label;
gc->owner = THIS_MODULE;
ret = gpiochip_add(gc);
if (ret) {
dev_err(&pdev->dev, "failed to register gpio_chip %s, error "
"code: %d\n", gc->label, ret);
return ret;
}
return 0;
}
/* unregister the gpiolib interface with the gpiolib subsystem */
static int __devinit samsung_gpiolib_unregister(struct platform_device *pdev,
struct samsung_pinctrl_drv_data *drvdata)
{
int ret = gpiochip_remove(drvdata->gc);
if (ret) {
dev_err(&pdev->dev, "gpio chip remove failed\n");
return ret;
}
return 0;
}
static const struct of_device_id samsung_pinctrl_dt_match[];
/* retrieve the soc specific data */
static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
struct platform_device *pdev)
{
int id;
const struct of_device_id *match;
const struct device_node *node = pdev->dev.of_node;
id = of_alias_get_id(pdev->dev.of_node, "pinctrl");
if (id < 0) {
dev_err(&pdev->dev, "failed to get alias id\n");
return NULL;
}
match = of_match_node(samsung_pinctrl_dt_match, node);
return (struct samsung_pin_ctrl *)match->data + id;
}
static int __devinit samsung_pinctrl_probe(struct platform_device *pdev)
{
struct samsung_pinctrl_drv_data *drvdata;
struct device *dev = &pdev->dev;
struct samsung_pin_ctrl *ctrl;
struct resource *res;
int ret;
if (!dev->of_node) {
dev_err(dev, "device tree node not found\n");
return -ENODEV;
}
ctrl = samsung_pinctrl_get_soc_data(pdev);
if (!ctrl) {
dev_err(&pdev->dev, "driver data not available\n");
return -EINVAL;
}
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata) {
dev_err(dev, "failed to allocate memory for driver's "
"private data\n");
return -ENOMEM;
}
drvdata->ctrl = ctrl;
drvdata->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "cannot find IO resource\n");
return -ENOENT;
}
drvdata->virt_base = devm_request_and_ioremap(&pdev->dev, res);
if (!drvdata->virt_base) {
dev_err(dev, "ioremap failed\n");
return -ENODEV;
}
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (res)
drvdata->irq = res->start;
ret = samsung_gpiolib_register(pdev, drvdata);
if (ret)
return ret;
ret = samsung_pinctrl_register(pdev, drvdata);
if (ret) {
samsung_gpiolib_unregister(pdev, drvdata);
return ret;
}
if (ctrl->eint_gpio_init)
ctrl->eint_gpio_init(drvdata);
if (ctrl->eint_wkup_init)
ctrl->eint_wkup_init(drvdata);
platform_set_drvdata(pdev, drvdata);
return 0;
}
static const struct of_device_id samsung_pinctrl_dt_match[] = {
{ .compatible = "samsung,pinctrl-exynos4210",
.data = (void *)exynos4210_pin_ctrl },
{},
};
MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
static struct platform_driver samsung_pinctrl_driver = {
.probe = samsung_pinctrl_probe,
.driver = {
.name = "samsung-pinctrl",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(samsung_pinctrl_dt_match),
},
};
static int __init samsung_pinctrl_drv_register(void)
{
return platform_driver_register(&samsung_pinctrl_driver);
}
postcore_initcall(samsung_pinctrl_drv_register);
static void __exit samsung_pinctrl_drv_unregister(void)
{
platform_driver_unregister(&samsung_pinctrl_driver);
}
module_exit(samsung_pinctrl_drv_unregister);
MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
MODULE_DESCRIPTION("Samsung pinctrl driver");
MODULE_LICENSE("GPL v2");
