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/*
* GPIO driver for the SMSC SCH311x Super-I/O chips
*
* Copyright (C) 2013 Bruno Randolf <br1@einfach.org>
*
* SuperIO functions and chip detection:
* (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/bitops.h>
#define DRV_NAME "gpio-sch311x"
#define SCH311X_GPIO_CONF_OUT 0x00
#define SCH311X_GPIO_CONF_IN 0x01
#define SCH311X_GPIO_CONF_INVERT 0x02
#define SCH311X_GPIO_CONF_OPEN_DRAIN 0x80
#define SIO_CONFIG_KEY_ENTER 0x55
#define SIO_CONFIG_KEY_EXIT 0xaa
#define GP1 0x4b
static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e };
static struct platform_device *sch311x_gpio_pdev;
struct sch311x_pdev_data { /* platform device data */
unsigned short runtime_reg; /* runtime register base address */
};
struct sch311x_gpio_block { /* one GPIO block runtime data */
struct gpio_chip chip;
unsigned short data_reg; /* from definition below */
unsigned short *config_regs; /* pointer to definition below */
unsigned short runtime_reg; /* runtime register */
spinlock_t lock; /* lock for this GPIO block */
};
struct sch311x_gpio_priv { /* driver private data */
struct sch311x_gpio_block blocks[6];
};
struct sch311x_gpio_block_def { /* register address definitions */
unsigned short data_reg;
unsigned short config_regs[8];
unsigned short base;
};
/* Note: some GPIOs are not available, these are marked with 0x00 */
static struct sch311x_gpio_block_def sch311x_gpio_blocks[] = {
{
.data_reg = 0x4b, /* GP1 */
.config_regs = {0x23, 0x24, 0x25, 0x26, 0x27, 0x29, 0x2a, 0x2b},
.base = 10,
},
{
.data_reg = 0x4c, /* GP2 */
.config_regs = {0x00, 0x2c, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x32},
.base = 20,
},
{
.data_reg = 0x4d, /* GP3 */
.config_regs = {0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x39, 0x3a},
.base = 30,
},
{
.data_reg = 0x4e, /* GP4 */
.config_regs = {0x3b, 0x00, 0x3d, 0x00, 0x6e, 0x6f, 0x72, 0x73},
.base = 40,
},
{
.data_reg = 0x4f, /* GP5 */
.config_regs = {0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46},
.base = 50,
},
{
.data_reg = 0x50, /* GP6 */
.config_regs = {0x47, 0x48, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59},
.base = 60,
},
};
static inline struct sch311x_gpio_block *
to_sch311x_gpio_block(struct gpio_chip *chip)
{
return container_of(chip, struct sch311x_gpio_block, chip);
}
/*
* Super-IO functions
*/
static inline int sch311x_sio_enter(int sio_config_port)
{
/* Don't step on other drivers' I/O space by accident. */
if (!request_muxed_region(sio_config_port, 2, DRV_NAME)) {
pr_err(DRV_NAME "I/O address 0x%04x already in use\n",
sio_config_port);
return -EBUSY;
}
outb(SIO_CONFIG_KEY_ENTER, sio_config_port);
return 0;
}
static inline void sch311x_sio_exit(int sio_config_port)
{
outb(SIO_CONFIG_KEY_EXIT, sio_config_port);
release_region(sio_config_port, 2);
}
static inline int sch311x_sio_inb(int sio_config_port, int reg)
{
outb(reg, sio_config_port);
return inb(sio_config_port + 1);
}
static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
{
outb(reg, sio_config_port);
outb(val, sio_config_port + 1);
}
/*
* GPIO functions
*/
static int sch311x_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
if (block->config_regs[offset] == 0) /* GPIO is not available */
return -ENODEV;
if (!request_region(block->runtime_reg + block->config_regs[offset],
1, DRV_NAME)) {
dev_err(chip->dev, "Failed to request region 0x%04x.\n",
block->runtime_reg + block->config_regs[offset]);
return -EBUSY;
}
return 0;
}
static void sch311x_gpio_free(struct gpio_chip *chip, unsigned offset)
{
struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
if (block->config_regs[offset] == 0) /* GPIO is not available */
return;
release_region(block->runtime_reg + block->config_regs[offset], 1);
}
static int sch311x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
unsigned char data;
spin_lock(&block->lock);
data = inb(block->runtime_reg + block->data_reg);
spin_unlock(&block->lock);
return !!(data & BIT(offset));
}
static void __sch311x_gpio_set(struct sch311x_gpio_block *block,
unsigned offset, int value)
{
unsigned char data = inb(block->runtime_reg + block->data_reg);
if (value)
data |= BIT(offset);
else
data &= ~BIT(offset);
outb(data, block->runtime_reg + block->data_reg);
}
static void sch311x_gpio_set(struct gpio_chip *chip, unsigned offset,
int value)
{
struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
spin_lock(&block->lock);
__sch311x_gpio_set(block, offset, value);
spin_unlock(&block->lock);
}
static int sch311x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
spin_lock(&block->lock);
outb(SCH311X_GPIO_CONF_IN, block->runtime_reg +
block->config_regs[offset]);
spin_unlock(&block->lock);
return 0;
}
static int sch311x_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
int value)
{
struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip);
spin_lock(&block->lock);
outb(SCH311X_GPIO_CONF_OUT, block->runtime_reg +
block->config_regs[offset]);
__sch311x_gpio_set(block, offset, value);
spin_unlock(&block->lock);
return 0;
}
static int sch311x_gpio_probe(struct platform_device *pdev)
{
struct sch311x_pdev_data *pdata = pdev->dev.platform_data;
struct sch311x_gpio_priv *priv;
struct sch311x_gpio_block *block;
int err, i;
/* we can register all GPIO data registers at once */
if (!request_region(pdata->runtime_reg + GP1, 6, DRV_NAME)) {
dev_err(&pdev->dev, "Failed to request region 0x%04x-0x%04x.\n",
pdata->runtime_reg + GP1, pdata->runtime_reg + GP1 + 5);
return -EBUSY;
}
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
block = &priv->blocks[i];
spin_lock_init(&block->
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