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linux/drivers/gpio/gpio-sch311x.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>.
*/
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/gpio/driver.h>
#include <linux/bitops.h>
#include <linux/io.h>
#define DRV_NAME "gpio-sch311x"
#define SCH311X_GPIO_CONF_DIR BIT(0)
#define SCH311X_GPIO_CONF_INVERT BIT(1)
#define SCH311X_GPIO_CONF_OPEN_DRAIN BIT(7)
#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,
},
};
/*
* 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 = gpiochip_get_data(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->parent, "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 = gpiochip_get_data(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 = gpiochip_get_data(chip);
u8 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)
{
u8 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 = gpiochip_get_data(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 = gpiochip_get_data(chip);
u8 data;
spin_lock(&block->lock);
data = inb(block->runtime_reg + block->config_regs[offset]);
data |= SCH311X_GPIO_CONF_DIR;
outb(data, 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 = gpiochip_get_data(chip);
u8 data;
spin_lock(&block->lock);
data = inb(block->runtime_reg + block->config_regs[offset]);
data &= ~SCH311X_GPIO_CONF_DIR;
outb(data, block->runtime_reg + block->config_regs[offset]);
__sch311x_gpio_set(block, offset, value);
spin_unlock(&block->lock);
return 0;
}
static int sch311x_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
{
struct sch311x_gpio_block *block = gpiochip_get_data(chip);
u8 data;
spin_lock(&block->lock);
data = inb(block->runtime_reg + block->config_regs[offset]);
spin_unlock(&block->lock);
return !!(data & SCH311X_GPIO_CONF_DIR);
}
static int sch311x_gpio_set_config(struct gpio_chip *chip, unsigned offset,
unsigned long config)
{
struct sch311x_gpio_block *block = gpiochip_get_data(chip);
enum pin_config_param param = pinconf_to_config_param(config);
u8 data;
switch (param) {
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
spin_lock(&block->lock);
data = inb(block->runtime_reg + block->config_regs[offset]);
data |= SCH311X_GPIO_CONF_OPEN_DRAIN;
outb(data, block->runtime_reg + block->config_regs[offset]);
spin_unlock(&block->lock);
return 0;
case PIN_CONFIG_DRIVE_PUSH_PULL:
spin_lock(&block->lock);
data = inb(block->runtime_reg + block->config_regs[offset]);
data &= ~SCH311X_GPIO_CONF_OPEN_DRAIN;
outb(data, block->runtime_reg + block->config_regs[offset]);
spin_unlock(&block->lock);
return 0;
default:
break;
}
return -ENOTSUPP;
}
static int sch311x_gpio_probe(struct platform_device *pdev)
{
struct sch311x_pdev_data *pdata = dev_get_platdata(&pdev->dev);
struct sch311x_gpio_priv *priv;
struct sch311x_gpio_block *block;
int err, i;
/* we can register all GPIO data registers at once */
if (!devm_request_region(&pdev->dev, 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->lock);
block->chip.label = DRV_NAME;
block->chip.owner = THIS_MODULE;
block->chip.request = sch311x_gpio_request;
block->chip.free = sch311x_gpio_free;
block->chip.direction_input = sch311x_gpio_direction_in;
block->chip.direction_output = sch311x_gpio_direction_out;
block->chip.get_direction = sch311x_gpio_get_direction;
block->chip.set_config = sch311x_gpio_set_config;
block->chip.get = sch311x_gpio_get;
block->chip.set = sch311x_gpio_set;
block->chip.ngpio = 8;
block->chip.parent = &pdev->dev;
block->chip.base = sch311x_gpio_blocks[i].base;
block->config_regs = sch311x_gpio_blocks[i].config_regs;
block->data_reg = sch311x_gpio_blocks[i].data_reg;
block->runtime_reg = pdata->runtime_reg;
err = gpiochip_add_data(&block->chip, block);
if (err < 0) {
dev_err(&pdev->dev,
"Could not register gpiochip, %d\n", err);
goto exit_err;
}
dev_info(&pdev->dev,
"SMSC SCH311x GPIO block %d registered.\n", i);
}
return 0;
exit_err:
/* release already registered chips */
for (--i; i >= 0; i--)
gpiochip_remove(&priv->blocks[i].chip);
return err;
}
static int sch311x_gpio_remove(struct platform_device *pdev)
{
struct sch311x_gpio_priv *priv = platform_get_drvdata(pdev);
int i;
for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
gpiochip_remove(&priv->blocks[i].chip);
dev_info(&pdev->dev,
"SMSC SCH311x GPIO block %d unregistered.\n", i);
}
return 0;
}
static struct platform_driver sch311x_gpio_driver = {
.driver.name = DRV_NAME,
.probe = sch311x_gpio_probe,
.remove = sch311x_gpio_remove,
};
/*
* Init & exit routines
*/
static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
{
int err = 0, reg;
unsigned short base_addr;
u8 dev_id;
err = sch311x_sio_enter(sio_config_port);
if (err)
return err;
/* Check device ID. */
reg = sch311x_sio_inb(sio_config_port, 0x20);
switch (reg) {
case 0x7c: /* SCH3112 */
dev_id = 2;
break;
case 0x7d: /* SCH3114 */
dev_id = 4;
break;
case 0x7f: /* SCH3116 */
dev_id = 6;
break;
default:
err = -ENODEV;
goto exit;
}
/* Select logical device A (runtime registers) */
sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
/* Check if Logical Device Register is currently active */
if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0)
pr_info("Seems that LDN 0x0a is not active...\n");
/* Get the base address of the runtime registers */
base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
sch311x_sio_inb(sio_config_port, 0x61);
if (!base_addr) {
pr_err("Base address not set\n");
err = -ENODEV;
goto exit;
}
*addr = base_addr;
pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr);
exit:
sch311x_sio_exit(sio_config_port);
return err;
}
static int __init sch311x_gpio_pdev_add(const unsigned short addr)
{
struct sch311x_pdev_data pdata;
int err;
pdata.runtime_reg = addr;
sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1);
if (!sch311x_gpio_pdev)
return -ENOMEM;
err = platform_device_add_data(sch311x_gpio_pdev,
&pdata, sizeof(pdata));
if (err) {
pr_err(DRV_NAME "Platform data allocation failed\n");
goto err;
}
err = platform_device_add(sch311x_gpio_pdev);
if (err) {
pr_err(DRV_NAME "Device addition failed\n");
goto err;
}
return 0;
err:
platform_device_put(sch311x_gpio_pdev);
return err;
}
static int __init sch311x_gpio_init(void)
{
int err, i;
unsigned short addr = 0;
for (i = 0; i < ARRAY_SIZE(sch311x_ioports); i++)
if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
break;
if (!addr)
return -ENODEV;
err = platform_driver_register(&sch311x_gpio_driver);
if (err)
return err;
err = sch311x_gpio_pdev_add(addr);
if (err)
goto unreg_platform_driver;
return 0;
unreg_platform_driver:
platform_driver_unregister(&sch311x_gpio_driver);
return err;
}
static void __exit sch311x_gpio_exit(void)
{
platform_device_unregister(sch311x_gpio_pdev);
platform_driver_unregister(&sch311x_gpio_driver);
}
module_init(sch311x_gpio_init);
module_exit(sch311x_gpio_exit);
MODULE_AUTHOR("Bruno Randolf <br1@einfach.org>");
MODULE_DESCRIPTION("SMSC SCH311x GPIO Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:gpio-sch311x");
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