https://github.com/torvalds/linux
Tip revision: 22763c5cf3690a681551162c15d34d935308c8d7 authored by Linus Torvalds on 03 December 2009, 03:51:21 UTC
Linux 2.6.32
Linux 2.6.32
Tip revision: 22763c5
pca953x.c
/*
* pca953x.c - 4/8/16 bit I/O ports
*
* Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
* Copyright (C) 2007 Marvell International Ltd.
*
* Derived from drivers/i2c/chips/pca9539.c
*
* 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; version 2 of the License.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/i2c/pca953x.h>
#ifdef CONFIG_OF_GPIO
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#endif
#define PCA953X_INPUT 0
#define PCA953X_OUTPUT 1
#define PCA953X_INVERT 2
#define PCA953X_DIRECTION 3
static const struct i2c_device_id pca953x_id[] = {
{ "pca9534", 8, },
{ "pca9535", 16, },
{ "pca9536", 4, },
{ "pca9537", 4, },
{ "pca9538", 8, },
{ "pca9539", 16, },
{ "pca9554", 8, },
{ "pca9555", 16, },
{ "pca9556", 8, },
{ "pca9557", 8, },
{ "max7310", 8, },
{ "max7315", 8, },
{ "pca6107", 8, },
{ "tca6408", 8, },
{ "tca6416", 16, },
/* NYET: { "tca6424", 24, }, */
{ }
};
MODULE_DEVICE_TABLE(i2c, pca953x_id);
struct pca953x_chip {
unsigned gpio_start;
uint16_t reg_output;
uint16_t reg_direction;
struct i2c_client *client;
struct pca953x_platform_data *dyn_pdata;
struct gpio_chip gpio_chip;
char **names;
};
static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
{
int ret;
if (chip->gpio_chip.ngpio <= 8)
ret = i2c_smbus_write_byte_data(chip->client, reg, val);
else
ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);
if (ret < 0) {
dev_err(&chip->client->dev, "failed writing register\n");
return ret;
}
return 0;
}
static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val)
{
int ret;
if (chip->gpio_chip.ngpio <= 8)
ret = i2c_smbus_read_byte_data(chip->client, reg);
else
ret = i2c_smbus_read_word_data(chip->client, reg << 1);
if (ret < 0) {
dev_err(&chip->client->dev, "failed reading register\n");
return ret;
}
*val = (uint16_t)ret;
return 0;
}
static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
{
struct pca953x_chip *chip;
uint16_t reg_val;
int ret;
chip = container_of(gc, struct pca953x_chip, gpio_chip);
reg_val = chip->reg_direction | (1u << off);
ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
if (ret)
return ret;
chip->reg_direction = reg_val;
return 0;
}
static int pca953x_gpio_direction_output(struct gpio_chip *gc,
unsigned off, int val)
{
struct pca953x_chip *chip;
uint16_t reg_val;
int ret;
chip = container_of(gc, struct pca953x_chip, gpio_chip);
/* set output level */
if (val)
reg_val = chip->reg_output | (1u << off);
else
reg_val = chip->reg_output & ~(1u << off);
ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
if (ret)
return ret;
chip->reg_output = reg_val;
/* then direction */
reg_val = chip->reg_direction & ~(1u << off);
ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
if (ret)
return ret;
chip->reg_direction = reg_val;
return 0;
}
static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
{
struct pca953x_chip *chip;
uint16_t reg_val;
int ret;
chip = container_of(gc, struct pca953x_chip, gpio_chip);
ret = pca953x_read_reg(chip, PCA953X_INPUT, ®_val);
if (ret < 0) {
/* NOTE: diagnostic already emitted; that's all we should
* do unless gpio_*_value_cansleep() calls become different
* from their nonsleeping siblings (and report faults).
*/
return 0;
}
return (reg_val & (1u << off)) ? 1 : 0;
}
static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
{
struct pca953x_chip *chip;
uint16_t reg_val;
int ret;
chip = container_of(gc, struct pca953x_chip, gpio_chip);
if (val)
reg_val = chip->reg_output | (1u << off);
else
reg_val = chip->reg_output & ~(1u << off);
ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
if (ret)
return;
chip->reg_output = reg_val;
}
static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
{
struct gpio_chip *gc;
gc = &chip->gpio_chip;
gc->direction_input = pca953x_gpio_direction_input;
gc->direction_output = pca953x_gpio_direction_output;
gc->get = pca953x_gpio_get_value;
gc->set = pca953x_gpio_set_value;
gc->can_sleep = 1;
gc->base = chip->gpio_start;
gc->ngpio = gpios;
gc->label = chip->client->name;
gc->dev = &chip->client->dev;
gc->owner = THIS_MODULE;
gc->names = chip->names;
}
/*
* Handlers for alternative sources of platform_data
*/
#ifdef CONFIG_OF_GPIO
/*
* Translate OpenFirmware node properties into platform_data
*/
static struct pca953x_platform_data *
pca953x_get_alt_pdata(struct i2c_client *client)
{
struct pca953x_platform_data *pdata;
struct device_node *node;
const uint16_t *val;
node = dev_archdata_get_node(&client->dev.archdata);
if (node == NULL)
return NULL;
pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL);
if (pdata == NULL) {
dev_err(&client->dev, "Unable to allocate platform_data\n");
return NULL;
}
pdata->gpio_base = -1;
val = of_get_property(node, "linux,gpio-base", NULL);
if (val) {
if (*val < 0)
dev_warn(&client->dev,
"invalid gpio-base in device tree\n");
else
pdata->gpio_base = *val;
}
val = of_get_property(node, "polarity", NULL);
if (val)
pdata->invert = *val;
return pdata;
}
#else
static struct pca953x_platform_data *
pca953x_get_alt_pdata(struct i2c_client *client)
{
return NULL;
}
#endif
static int __devinit pca953x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pca953x_platform_data *pdata;
struct pca953x_chip *chip;
int ret;
chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
pdata = client->dev.platform_data;
if (pdata == NULL) {
pdata = pca953x_get_alt_pdata(client);
/*
* Unlike normal platform_data, this is allocated
* dynamically and must be freed in the driver
*/
chip->dyn_pdata = pdata;
}
if (pdata == NULL) {
dev_dbg(&client->dev, "no platform data\n");
ret = -EINVAL;
goto out_failed;
}
chip->client = client;
chip->gpio_start = pdata->gpio_base;
chip->names = pdata->names;
/* initialize cached registers from their original values.
* we can't share this chip with another i2c master.
*/
pca953x_setup_gpio(chip, id->driver_data);
ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
if (ret)
goto out_failed;
ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
if (ret)
goto out_failed;
/* set platform specific polarity inversion */
ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
if (ret)
goto out_failed;
ret = gpiochip_add(&chip->gpio_chip);
if (ret)
goto out_failed;
if (pdata->setup) {
ret = pdata->setup(client, chip->gpio_chip.base,
chip->gpio_chip.ngpio, pdata->context);
if (ret < 0)
dev_warn(&client->dev, "setup failed, %d\n", ret);
}
i2c_set_clientdata(client, chip);
return 0;
out_failed:
kfree(chip->dyn_pdata);
kfree(chip);
return ret;
}
static int pca953x_remove(struct i2c_client *client)
{
struct pca953x_platform_data *pdata = client->dev.platform_data;
struct pca953x_chip *chip = i2c_get_clientdata(client);
int ret = 0;
if (pdata->teardown) {
ret = pdata->teardown(client, chip->gpio_chip.base,
chip->gpio_chip.ngpio, pdata->context);
if (ret < 0) {
dev_err(&client->dev, "%s failed, %d\n",
"teardown", ret);
return ret;
}
}
ret = gpiochip_remove(&chip->gpio_chip);
if (ret) {
dev_err(&client->dev, "%s failed, %d\n",
"gpiochip_remove()", ret);
return ret;
}
kfree(chip->dyn_pdata);
kfree(chip);
return 0;
}
static struct i2c_driver pca953x_driver = {
.driver = {
.name = "pca953x",
},
.probe = pca953x_probe,
.remove = pca953x_remove,
.id_table = pca953x_id,
};
static int __init pca953x_init(void)
{
return i2c_add_driver(&pca953x_driver);
}
/* register after i2c postcore initcall and before
* subsys initcalls that may rely on these GPIOs
*/
subsys_initcall(pca953x_init);
static void __exit pca953x_exit(void)
{
i2c_del_driver(&pca953x_driver);
}
module_exit(pca953x_exit);
MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
MODULE_LICENSE("GPL");