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linux/drivers/gpio/gpio-f7188x.c
Simon Guinot 6c17aa0138 gpio: add GPIO support for F71882FG and F71889F 
This patch adds support for the GPIOs found on the Fintek super-I/O
chips F71882FG and F71889F.

A super-I/O is a legacy I/O controller embedded on x86 motherboards. It
is used to connect the low-bandwidth devices. Among others functions the
F71882FG/F71889F provides: a parallel port, two serial ports, a keyboard
controller, an hardware monitoring controller and some GPIO pins.

Note that this super-I/Os are embedded on some Atom-based LaCie NASes.
The GPIOs are used to control the LEDs and the hard drive power.

Changes since v3:
- Use request_muxed_region to protect the I/O ports against concurrent
  accesses.

Changes since v2:
- Remove useless NULL setters for driver data.

Changes since v1:
- Enhance the commit message by describing what is a Super-I/O.
- Use self-explanatory names for the GPIO register macros.
- Add a comment to explain the platform device and driver registration.
- Fix gpio_get when GPIO is configured in input mode. I only had
  the hardware to check this mode recently...

Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-08-30 09:25:52 +02:00

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/*
* GPIO driver for Fintek Super-I/O F71882 and F71889
*
* Copyright (C) 2010-2013 LaCie
*
* Author: Simon Guinot <simon.guinot@sequanux.org>
*
* 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.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/gpio.h>
#define DRVNAME "gpio-f7188x"
/*
* Super-I/O registers
*/
#define SIO_LDSEL 0x07 /* Logical device select */
#define SIO_DEVID 0x20 /* Device ID (2 bytes) */
#define SIO_DEVREV 0x22 /* Device revision */
#define SIO_MANID 0x23 /* Fintek ID (2 bytes) */
#define SIO_LD_GPIO 0x06 /* GPIO logical device */
#define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */
#define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */
#define SIO_FINTEK_ID 0x1934 /* Manufacturer ID */
#define SIO_F71882_ID 0x0541 /* F71882 chipset ID */
#define SIO_F71889_ID 0x0909 /* F71889 chipset ID */
enum chips { f71882fg, f71889f };
static const char * const f7188x_names[] = {
"f71882fg",
"f71889f",
};
struct f7188x_sio {
int addr;
enum chips type;
};
struct f7188x_gpio_bank {
struct gpio_chip chip;
unsigned int regbase;
struct f7188x_gpio_data *data;
};
struct f7188x_gpio_data {
struct f7188x_sio *sio;
int nr_bank;
struct f7188x_gpio_bank *bank;
};
/*
* Super-I/O functions.
*/
static inline int superio_inb(int base, int reg)
{
outb(reg, base);
return inb(base + 1);
}
static int superio_inw(int base, int reg)
{
int val;
outb(reg++, base);
val = inb(base + 1) << 8;
outb(reg, base);
val |= inb(base + 1);
return val;
}
static inline void superio_outb(int base, int reg, int val)
{
outb(reg, base);
outb(val, base + 1);
}
static inline int superio_enter(int base)
{
/* Don't step on other drivers' I/O space by accident. */
if (!request_muxed_region(base, 2, DRVNAME)) {
pr_err(DRVNAME "I/O address 0x%04x already in use\n", base);
return -EBUSY;
}
/* According to the datasheet the key must be send twice. */
outb(SIO_UNLOCK_KEY, base);
outb(SIO_UNLOCK_KEY, base);
return 0;
}
static inline void superio_select(int base, int ld)
{
outb(SIO_LDSEL, base);
outb(ld, base + 1);
}
static inline void superio_exit(int base)
{
outb(SIO_LOCK_KEY, base);
release_region(base, 2);
}
/*
* GPIO chip.
*/
static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset);
static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset);
static int f7188x_gpio_direction_out(struct gpio_chip *chip,
unsigned offset, int value);
static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value);
#define F7188X_GPIO_BANK(_base, _ngpio, _regbase) \
{ \
.chip = { \
.label = DRVNAME, \
.owner = THIS_MODULE, \
.direction_input = f7188x_gpio_direction_in, \
.get = f7188x_gpio_get, \
.direction_output = f7188x_gpio_direction_out, \
.set = f7188x_gpio_set, \
.base = _base, \
.ngpio = _ngpio, \
}, \
.regbase = _regbase, \
}
#define gpio_dir(base) (base + 0)
#define gpio_data_out(base) (base + 1)
#define gpio_data_in(base) (base + 2)
/* Output mode register (0:open drain 1:push-pull). */
#define gpio_out_mode(base) (base + 3)
static struct f7188x_gpio_bank f71882_gpio_bank[] = {
F7188X_GPIO_BANK(0 , 8, 0xF0),
F7188X_GPIO_BANK(10, 8, 0xE0),
F7188X_GPIO_BANK(20, 8, 0xD0),
F7188X_GPIO_BANK(30, 4, 0xC0),
F7188X_GPIO_BANK(40, 4, 0xB0),
};
static struct f7188x_gpio_bank f71889_gpio_bank[] = {
F7188X_GPIO_BANK(0 , 7, 0xF0),
F7188X_GPIO_BANK(10, 7, 0xE0),
F7188X_GPIO_BANK(20, 8, 0xD0),
F7188X_GPIO_BANK(30, 8, 0xC0),
F7188X_GPIO_BANK(40, 8, 0xB0),
F7188X_GPIO_BANK(50, 5, 0xA0),
F7188X_GPIO_BANK(60, 8, 0x90),
F7188X_GPIO_BANK(70, 8, 0x80),
};
static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
int err;
struct f7188x_gpio_bank *bank =
container_of(chip, struct f7188x_gpio_bank, chip);
struct f7188x_sio *sio = bank->data->sio;
u8 dir;
err = superio_enter(sio->addr);
if (err)
return err;
superio_select(sio->addr, SIO_LD_GPIO);
dir = superio_inb(sio->addr, gpio_dir(bank->regbase));
dir &= ~(1 << offset);
superio_outb(sio->addr, gpio_dir(bank->regbase), dir);
superio_exit(sio->addr);
return 0;
}
static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
int err;
struct f7188x_gpio_bank *bank =
container_of(chip, struct f7188x_gpio_bank, chip);
struct f7188x_sio *sio = bank->data->sio;
u8 dir, data;
err = superio_enter(sio->addr);
if (err)
return err;
superio_select(sio->addr, SIO_LD_GPIO);
dir = superio_inb(sio->addr, gpio_dir(bank->regbase));
dir = !!(dir & (1 << offset));
if (dir)
data = superio_inb(sio->addr, gpio_data_out(bank->regbase));
else
data = superio_inb(sio->addr, gpio_data_in(bank->regbase));
superio_exit(sio->addr);
return !!(data & 1 << offset);
}
static int f7188x_gpio_direction_out(struct gpio_chip *chip,
unsigned offset, int value)
{
int err;
struct f7188x_gpio_bank *bank =
container_of(chip, struct f7188x_gpio_bank, chip);
struct f7188x_sio *sio = bank->data->sio;
u8 dir, data_out;
err = superio_enter(sio->addr);
if (err)
return err;
superio_select(sio->addr, SIO_LD_GPIO);
data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase));
if (value)
data_out |= (1 << offset);
else
data_out &= ~(1 << offset);
superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out);
dir = superio_inb(sio->addr, gpio_dir(bank->regbase));
dir |= (1 << offset);
superio_outb(sio->addr, gpio_dir(bank->regbase), dir);
superio_exit(sio->addr);
return 0;
}
static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
int err;
struct f7188x_gpio_bank *bank =
container_of(chip, struct f7188x_gpio_bank, chip);
struct f7188x_sio *sio = bank->data->sio;
u8 data_out;
err = superio_enter(sio->addr);
if (err)
return;
superio_select(sio->addr, SIO_LD_GPIO);
data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase));
if (value)
data_out |= (1 << offset);
else
data_out &= ~(1 << offset);
superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out);
superio_exit(sio->addr);
}
/*
* Platform device and driver.
*/
static int f7188x_gpio_probe(struct platform_device *pdev)
{
int err;
int i;
struct f7188x_sio *sio = pdev->dev.platform_data;
struct f7188x_gpio_data *data;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
switch (sio->type) {
case f71882fg:
data->nr_bank = ARRAY_SIZE(f71882_gpio_bank);
data->bank = f71882_gpio_bank;
break;
case f71889f:
data->nr_bank = ARRAY_SIZE(f71889_gpio_bank);
data->bank = f71889_gpio_bank;
break;
default:
return -ENODEV;
}
data->sio = sio;
platform_set_drvdata(pdev, data);
/* For each GPIO bank, register a GPIO chip. */
for (i = 0; i < data->nr_bank; i++) {
struct f7188x_gpio_bank *bank = &data->bank[i];
bank->chip.dev = &pdev->dev;
bank->data = data;
err = gpiochip_add(&bank->chip);
if (err) {
dev_err(&pdev->dev,
"Failed to register gpiochip %d: %d\n",
i, err);
goto err_gpiochip;
}
}
return 0;
err_gpiochip:
for (i = i - 1; i >= 0; i--) {
struct f7188x_gpio_bank *bank = &data->bank[i];
int tmp;
tmp = gpiochip_remove(&bank->chip);
if (tmp < 0)
dev_err(&pdev->dev,
"Failed to remove gpiochip %d: %d\n",
i, tmp);
}
return err;
}
static int f7188x_gpio_remove(struct platform_device *pdev)
{
int err;
int i;
struct f7188x_gpio_data *data = platform_get_drvdata(pdev);
for (i = 0; i < data->nr_bank; i++) {
struct f7188x_gpio_bank *bank = &data->bank[i];
err = gpiochip_remove(&bank->chip);
if (err) {
dev_err(&pdev->dev,
"Failed to remove GPIO gpiochip %d: %d\n",
i, err);
return err;
}
}
return 0;
}
static int __init f7188x_find(int addr, struct f7188x_sio *sio)
{
int err;
u16 devid;
err = superio_enter(addr);
if (err)
return err;
err = -ENODEV;
devid = superio_inw(addr, SIO_MANID);
if (devid != SIO_FINTEK_ID) {
pr_debug(DRVNAME ": Not a Fintek device at 0x%08x\n", addr);
goto err;
}
devid = superio_inw(addr, SIO_DEVID);
switch (devid) {
case SIO_F71882_ID:
sio->type = f71882fg;
break;
case SIO_F71889_ID:
sio->type = f71889f;
break;
default:
pr_info(DRVNAME ": Unsupported Fintek device 0x%04x\n", devid);
goto err;
}
sio->addr = addr;
err = 0;
pr_info(DRVNAME ": Found %s at %#x, revision %d\n",
f7188x_names[sio->type],
(unsigned int) addr,
(int) superio_inb(addr, SIO_DEVREV));
err:
superio_exit(addr);
return err;
}
static struct platform_device *f7188x_gpio_pdev;
static int __init
f7188x_gpio_device_add(const struct f7188x_sio *sio)
{
int err;
f7188x_gpio_pdev = platform_device_alloc(DRVNAME, -1);
if (!f7188x_gpio_pdev)
return -ENOMEM;
err = platform_device_add_data(f7188x_gpio_pdev,
sio, sizeof(*sio));
if (err) {
pr_err(DRVNAME "Platform data allocation failed\n");
goto err;
}
err = platform_device_add(f7188x_gpio_pdev);
if (err) {
pr_err(DRVNAME "Device addition failed\n");
goto err;
}
return 0;
err:
platform_device_put(f7188x_gpio_pdev);
return err;
}
/*
* Try to match a supported Fintech device by reading the (hard-wired)
* configuration I/O ports. If available, then register both the platform
* device and driver to support the GPIOs.
*/
static struct platform_driver f7188x_gpio_driver = {
.driver = {
.owner = THIS_MODULE,
.name = DRVNAME,
},
.probe = f7188x_gpio_probe,
.remove = f7188x_gpio_remove,
};
static int __init f7188x_gpio_init(void)
{
int err;
struct f7188x_sio sio;
if (f7188x_find(0x2e, &sio) &&
f7188x_find(0x4e, &sio))
return -ENODEV;
err = platform_driver_register(&f7188x_gpio_driver);
if (!err) {
err = f7188x_gpio_device_add(&sio);
if (err)
platform_driver_unregister(&f7188x_gpio_driver);
}
return err;
}
subsys_initcall(f7188x_gpio_init);
static void __exit f7188x_gpio_exit(void)
{
platform_device_unregister(f7188x_gpio_pdev);
platform_driver_unregister(&f7188x_gpio_driver);
}
module_exit(f7188x_gpio_exit);
MODULE_DESCRIPTION("GPIO driver for Super-I/O chips F71882FG and F71889F");
MODULE_AUTHOR("Simon Guinot <simon.guinot@sequanux.org>");
MODULE_LICENSE("GPL");
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