Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 666 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-f7188x.c b/drivers/gpio/gpio-f7188x.c
new file mode 100644
index 0000000000..f54ca5a177
--- /dev/null
+++ b/drivers/gpio/gpio-f7188x.c
@@ -0,0 +1,666 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * GPIO driver for Fintek and Nuvoton Super-I/O chips
+ *
+ * Copyright (C) 2010-2013 LaCie
+ *
+ * Author: Simon Guinot <simon.guinot@sequanux.org>
+ */
+
+#define DRVNAME "gpio-f7188x"
+#define pr_fmt(fmt) DRVNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/gpio/driver.h>
+#include <linux/bitops.h>
+
+/*
+ * Super-I/O registers
+ */
+#define SIO_LDSEL		0x07	/* Logical device select */
+#define SIO_DEVID		0x20	/* Device ID (2 bytes) */
+
+#define SIO_UNLOCK_KEY		0x87	/* Key to enable Super-I/O */
+#define SIO_LOCK_KEY		0xAA	/* Key to disable Super-I/O */
+
+/*
+ * Fintek devices.
+ */
+#define SIO_FINTEK_DEVREV	0x22	/* Fintek Device revision */
+#define SIO_FINTEK_MANID	0x23    /* Fintek ID (2 bytes) */
+
+#define SIO_FINTEK_ID		0x1934  /* Manufacturer ID */
+
+#define SIO_F71869_ID		0x0814	/* F71869 chipset ID */
+#define SIO_F71869A_ID		0x1007	/* F71869A chipset ID */
+#define SIO_F71882_ID		0x0541	/* F71882 chipset ID */
+#define SIO_F71889_ID		0x0909	/* F71889 chipset ID */
+#define SIO_F71889A_ID		0x1005	/* F71889A chipset ID */
+#define SIO_F81866_ID		0x1010	/* F81866 chipset ID */
+#define SIO_F81804_ID		0x1502  /* F81804 chipset ID, same for F81966 */
+#define SIO_F81865_ID		0x0704	/* F81865 chipset ID */
+
+#define SIO_LD_GPIO_FINTEK	0x06	/* GPIO logical device */
+
+/*
+ * Nuvoton devices.
+ */
+#define SIO_NCT6126D_ID		0xD283  /* NCT6126D chipset ID */
+
+#define SIO_LD_GPIO_NUVOTON	0x07	/* GPIO logical device */
+
+
+enum chips {
+	f71869,
+	f71869a,
+	f71882fg,
+	f71889a,
+	f71889f,
+	f81866,
+	f81804,
+	f81865,
+	nct6126d,
+};
+
+static const char * const f7188x_names[] = {
+	"f71869",
+	"f71869a",
+	"f71882fg",
+	"f71889a",
+	"f71889f",
+	"f81866",
+	"f81804",
+	"f81865",
+	"nct6126d",
+};
+
+struct f7188x_sio {
+	int addr;
+	int device;
+	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("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_get_direction(struct gpio_chip *chip, unsigned offset);
+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);
+static int f7188x_gpio_set_config(struct gpio_chip *chip, unsigned offset,
+				  unsigned long config);
+
+#define F7188X_GPIO_BANK(_base, _ngpio, _regbase, _label)			\
+	{								\
+		.chip = {						\
+			.label            = _label,			\
+			.owner            = THIS_MODULE,		\
+			.get_direction    = f7188x_gpio_get_direction,	\
+			.direction_input  = f7188x_gpio_direction_in,	\
+			.get              = f7188x_gpio_get,		\
+			.direction_output = f7188x_gpio_direction_out,	\
+			.set              = f7188x_gpio_set,		\
+			.set_config	  = f7188x_gpio_set_config,	\
+			.base             = _base,			\
+			.ngpio            = _ngpio,			\
+			.can_sleep        = true,			\
+		},							\
+		.regbase = _regbase,					\
+	}
+
+#define f7188x_gpio_dir(base) ((base) + 0)
+#define f7188x_gpio_data_out(base) ((base) + 1)
+#define f7188x_gpio_data_in(base) ((base) + 2)
+/* Output mode register (0:open drain 1:push-pull). */
+#define f7188x_gpio_out_mode(base) ((base) + 3)
+
+#define f7188x_gpio_dir_invert(type)	((type) == nct6126d)
+#define f7188x_gpio_data_single(type)	((type) == nct6126d)
+
+static struct f7188x_gpio_bank f71869_gpio_bank[] = {
+	F7188X_GPIO_BANK(0, 6, 0xF0, DRVNAME "-0"),
+	F7188X_GPIO_BANK(10, 8, 0xE0, DRVNAME "-1"),
+	F7188X_GPIO_BANK(20, 8, 0xD0, DRVNAME "-2"),
+	F7188X_GPIO_BANK(30, 8, 0xC0, DRVNAME "-3"),
+	F7188X_GPIO_BANK(40, 8, 0xB0, DRVNAME "-4"),
+	F7188X_GPIO_BANK(50, 5, 0xA0, DRVNAME "-5"),
+	F7188X_GPIO_BANK(60, 6, 0x90, DRVNAME "-6"),
+};
+
+static struct f7188x_gpio_bank f71869a_gpio_bank[] = {
+	F7188X_GPIO_BANK(0, 6, 0xF0, DRVNAME "-0"),
+	F7188X_GPIO_BANK(10, 8, 0xE0, DRVNAME "-1"),
+	F7188X_GPIO_BANK(20, 8, 0xD0, DRVNAME "-2"),
+	F7188X_GPIO_BANK(30, 8, 0xC0, DRVNAME "-3"),
+	F7188X_GPIO_BANK(40, 8, 0xB0, DRVNAME "-4"),
+	F7188X_GPIO_BANK(50, 5, 0xA0, DRVNAME "-5"),
+	F7188X_GPIO_BANK(60, 8, 0x90, DRVNAME "-6"),
+	F7188X_GPIO_BANK(70, 8, 0x80, DRVNAME "-7"),
+};
+
+static struct f7188x_gpio_bank f71882_gpio_bank[] = {
+	F7188X_GPIO_BANK(0, 8, 0xF0, DRVNAME "-0"),
+	F7188X_GPIO_BANK(10, 8, 0xE0, DRVNAME "-1"),
+	F7188X_GPIO_BANK(20, 8, 0xD0, DRVNAME "-2"),
+	F7188X_GPIO_BANK(30, 4, 0xC0, DRVNAME "-3"),
+	F7188X_GPIO_BANK(40, 4, 0xB0, DRVNAME "-4"),
+};
+
+static struct f7188x_gpio_bank f71889a_gpio_bank[] = {
+	F7188X_GPIO_BANK(0, 7, 0xF0, DRVNAME "-0"),
+	F7188X_GPIO_BANK(10, 7, 0xE0, DRVNAME "-1"),
+	F7188X_GPIO_BANK(20, 8, 0xD0, DRVNAME "-2"),
+	F7188X_GPIO_BANK(30, 8, 0xC0, DRVNAME "-3"),
+	F7188X_GPIO_BANK(40, 8, 0xB0, DRVNAME "-4"),
+	F7188X_GPIO_BANK(50, 5, 0xA0, DRVNAME "-5"),
+	F7188X_GPIO_BANK(60, 8, 0x90, DRVNAME "-6"),
+	F7188X_GPIO_BANK(70, 8, 0x80, DRVNAME "-7"),
+};
+
+static struct f7188x_gpio_bank f71889_gpio_bank[] = {
+	F7188X_GPIO_BANK(0, 7, 0xF0, DRVNAME "-0"),
+	F7188X_GPIO_BANK(10, 7, 0xE0, DRVNAME "-1"),
+	F7188X_GPIO_BANK(20, 8, 0xD0, DRVNAME "-2"),
+	F7188X_GPIO_BANK(30, 8, 0xC0, DRVNAME "-3"),
+	F7188X_GPIO_BANK(40, 8, 0xB0, DRVNAME "-4"),
+	F7188X_GPIO_BANK(50, 5, 0xA0, DRVNAME "-5"),
+	F7188X_GPIO_BANK(60, 8, 0x90, DRVNAME "-6"),
+	F7188X_GPIO_BANK(70, 8, 0x80, DRVNAME "-7"),
+};
+
+static struct f7188x_gpio_bank f81866_gpio_bank[] = {
+	F7188X_GPIO_BANK(0, 8, 0xF0, DRVNAME "-0"),
+	F7188X_GPIO_BANK(10, 8, 0xE0, DRVNAME "-1"),
+	F7188X_GPIO_BANK(20, 8, 0xD0, DRVNAME "-2"),
+	F7188X_GPIO_BANK(30, 8, 0xC0, DRVNAME "-3"),
+	F7188X_GPIO_BANK(40, 8, 0xB0, DRVNAME "-4"),
+	F7188X_GPIO_BANK(50, 8, 0xA0, DRVNAME "-5"),
+	F7188X_GPIO_BANK(60, 8, 0x90, DRVNAME "-6"),
+	F7188X_GPIO_BANK(70, 8, 0x80, DRVNAME "-7"),
+	F7188X_GPIO_BANK(80, 8, 0x88, DRVNAME "-8"),
+};
+
+
+static struct f7188x_gpio_bank f81804_gpio_bank[] = {
+	F7188X_GPIO_BANK(0, 8, 0xF0, DRVNAME "-0"),
+	F7188X_GPIO_BANK(10, 8, 0xE0, DRVNAME "-1"),
+	F7188X_GPIO_BANK(20, 8, 0xD0, DRVNAME "-2"),
+	F7188X_GPIO_BANK(50, 8, 0xA0, DRVNAME "-3"),
+	F7188X_GPIO_BANK(60, 8, 0x90, DRVNAME "-4"),
+	F7188X_GPIO_BANK(70, 8, 0x80, DRVNAME "-5"),
+	F7188X_GPIO_BANK(90, 8, 0x98, DRVNAME "-6"),
+};
+
+static struct f7188x_gpio_bank f81865_gpio_bank[] = {
+	F7188X_GPIO_BANK(0, 8, 0xF0, DRVNAME "-0"),
+	F7188X_GPIO_BANK(10, 8, 0xE0, DRVNAME "-1"),
+	F7188X_GPIO_BANK(20, 8, 0xD0, DRVNAME "-2"),
+	F7188X_GPIO_BANK(30, 8, 0xC0, DRVNAME "-3"),
+	F7188X_GPIO_BANK(40, 8, 0xB0, DRVNAME "-4"),
+	F7188X_GPIO_BANK(50, 8, 0xA0, DRVNAME "-5"),
+	F7188X_GPIO_BANK(60, 5, 0x90, DRVNAME "-6"),
+};
+
+static struct f7188x_gpio_bank nct6126d_gpio_bank[] = {
+	F7188X_GPIO_BANK(0, 8, 0xE0, DRVNAME "-0"),
+	F7188X_GPIO_BANK(10, 8, 0xE4, DRVNAME "-1"),
+	F7188X_GPIO_BANK(20, 8, 0xE8, DRVNAME "-2"),
+	F7188X_GPIO_BANK(30, 8, 0xEC, DRVNAME "-3"),
+	F7188X_GPIO_BANK(40, 8, 0xF0, DRVNAME "-4"),
+	F7188X_GPIO_BANK(50, 8, 0xF4, DRVNAME "-5"),
+	F7188X_GPIO_BANK(60, 8, 0xF8, DRVNAME "-6"),
+	F7188X_GPIO_BANK(70, 8, 0xFC, DRVNAME "-7"),
+};
+
+static int f7188x_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
+{
+	int err;
+	struct f7188x_gpio_bank *bank = gpiochip_get_data(chip);
+	struct f7188x_sio *sio = bank->data->sio;
+	u8 dir;
+
+	err = superio_enter(sio->addr);
+	if (err)
+		return err;
+	superio_select(sio->addr, sio->device);
+
+	dir = superio_inb(sio->addr, f7188x_gpio_dir(bank->regbase));
+
+	superio_exit(sio->addr);
+
+	if (f7188x_gpio_dir_invert(sio->type))
+		dir = ~dir;
+
+	if (dir & BIT(offset))
+		return GPIO_LINE_DIRECTION_OUT;
+
+	return GPIO_LINE_DIRECTION_IN;
+}
+
+static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+	int err;
+	struct f7188x_gpio_bank *bank = gpiochip_get_data(chip);
+	struct f7188x_sio *sio = bank->data->sio;
+	u8 dir;
+
+	err = superio_enter(sio->addr);
+	if (err)
+		return err;
+	superio_select(sio->addr, sio->device);
+
+	dir = superio_inb(sio->addr, f7188x_gpio_dir(bank->regbase));
+
+	if (f7188x_gpio_dir_invert(sio->type))
+		dir |= BIT(offset);
+	else
+		dir &= ~BIT(offset);
+	superio_outb(sio->addr, f7188x_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 = gpiochip_get_data(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->device);
+
+	dir = superio_inb(sio->addr, f7188x_gpio_dir(bank->regbase));
+	dir = !!(dir & BIT(offset));
+	if (f7188x_gpio_data_single(sio->type) || dir)
+		data = superio_inb(sio->addr, f7188x_gpio_data_out(bank->regbase));
+	else
+		data = superio_inb(sio->addr, f7188x_gpio_data_in(bank->regbase));
+
+	superio_exit(sio->addr);
+
+	return !!(data & BIT(offset));
+}
+
+static int f7188x_gpio_direction_out(struct gpio_chip *chip,
+				     unsigned offset, int value)
+{
+	int err;
+	struct f7188x_gpio_bank *bank = gpiochip_get_data(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->device);
+
+	data_out = superio_inb(sio->addr, f7188x_gpio_data_out(bank->regbase));
+	if (value)
+		data_out |= BIT(offset);
+	else
+		data_out &= ~BIT(offset);
+	superio_outb(sio->addr, f7188x_gpio_data_out(bank->regbase), data_out);
+
+	dir = superio_inb(sio->addr, f7188x_gpio_dir(bank->regbase));
+	if (f7188x_gpio_dir_invert(sio->type))
+		dir &= ~BIT(offset);
+	else
+		dir |= BIT(offset);
+	superio_outb(sio->addr, f7188x_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 = gpiochip_get_data(chip);
+	struct f7188x_sio *sio = bank->data->sio;
+	u8 data_out;
+
+	err = superio_enter(sio->addr);
+	if (err)
+		return;
+	superio_select(sio->addr, sio->device);
+
+	data_out = superio_inb(sio->addr, f7188x_gpio_data_out(bank->regbase));
+	if (value)
+		data_out |= BIT(offset);
+	else
+		data_out &= ~BIT(offset);
+	superio_outb(sio->addr, f7188x_gpio_data_out(bank->regbase), data_out);
+
+	superio_exit(sio->addr);
+}
+
+static int f7188x_gpio_set_config(struct gpio_chip *chip, unsigned offset,
+				  unsigned long config)
+{
+	int err;
+	enum pin_config_param param = pinconf_to_config_param(config);
+	struct f7188x_gpio_bank *bank = gpiochip_get_data(chip);
+	struct f7188x_sio *sio = bank->data->sio;
+	u8 data;
+
+	if (param != PIN_CONFIG_DRIVE_OPEN_DRAIN &&
+	    param != PIN_CONFIG_DRIVE_PUSH_PULL)
+		return -ENOTSUPP;
+
+	err = superio_enter(sio->addr);
+	if (err)
+		return err;
+	superio_select(sio->addr, sio->device);
+
+	data = superio_inb(sio->addr, f7188x_gpio_out_mode(bank->regbase));
+	if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
+		data &= ~BIT(offset);
+	else
+		data |= BIT(offset);
+	superio_outb(sio->addr, f7188x_gpio_out_mode(bank->regbase), data);
+
+	superio_exit(sio->addr);
+	return 0;
+}
+
+/*
+ * Platform device and driver.
+ */
+
+static int f7188x_gpio_probe(struct platform_device *pdev)
+{
+	int err;
+	int i;
+	struct f7188x_sio *sio = dev_get_platdata(&pdev->dev);
+	struct f7188x_gpio_data *data;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	switch (sio->type) {
+	case f71869:
+		data->nr_bank = ARRAY_SIZE(f71869_gpio_bank);
+		data->bank = f71869_gpio_bank;
+		break;
+	case f71869a:
+		data->nr_bank = ARRAY_SIZE(f71869a_gpio_bank);
+		data->bank = f71869a_gpio_bank;
+		break;
+	case f71882fg:
+		data->nr_bank = ARRAY_SIZE(f71882_gpio_bank);
+		data->bank = f71882_gpio_bank;
+		break;
+	case f71889a:
+		data->nr_bank = ARRAY_SIZE(f71889a_gpio_bank);
+		data->bank = f71889a_gpio_bank;
+		break;
+	case f71889f:
+		data->nr_bank = ARRAY_SIZE(f71889_gpio_bank);
+		data->bank = f71889_gpio_bank;
+		break;
+	case f81866:
+		data->nr_bank = ARRAY_SIZE(f81866_gpio_bank);
+		data->bank = f81866_gpio_bank;
+		break;
+	case  f81804:
+		data->nr_bank = ARRAY_SIZE(f81804_gpio_bank);
+		data->bank = f81804_gpio_bank;
+		break;
+	case f81865:
+		data->nr_bank = ARRAY_SIZE(f81865_gpio_bank);
+		data->bank = f81865_gpio_bank;
+		break;
+	case nct6126d:
+		data->nr_bank = ARRAY_SIZE(nct6126d_gpio_bank);
+		data->bank = nct6126d_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.parent = &pdev->dev;
+		bank->data = data;
+
+		err = devm_gpiochip_add_data(&pdev->dev, &bank->chip, bank);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Failed to register 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;
+	u16 manid;
+
+	err = superio_enter(addr);
+	if (err)
+		return err;
+
+	err = -ENODEV;
+
+	sio->device = SIO_LD_GPIO_FINTEK;
+	devid = superio_inw(addr, SIO_DEVID);
+	switch (devid) {
+	case SIO_F71869_ID:
+		sio->type = f71869;
+		break;
+	case SIO_F71869A_ID:
+		sio->type = f71869a;
+		break;
+	case SIO_F71882_ID:
+		sio->type = f71882fg;
+		break;
+	case SIO_F71889A_ID:
+		sio->type = f71889a;
+		break;
+	case SIO_F71889_ID:
+		sio->type = f71889f;
+		break;
+	case SIO_F81866_ID:
+		sio->type = f81866;
+		break;
+	case SIO_F81804_ID:
+		sio->type = f81804;
+		break;
+	case SIO_F81865_ID:
+		sio->type = f81865;
+		break;
+	case SIO_NCT6126D_ID:
+		sio->device = SIO_LD_GPIO_NUVOTON;
+		sio->type = nct6126d;
+		break;
+	default:
+		pr_info("Unsupported Fintek device 0x%04x\n", devid);
+		goto err;
+	}
+
+	/* double check manufacturer where possible */
+	if (sio->type != nct6126d) {
+		manid = superio_inw(addr, SIO_FINTEK_MANID);
+		if (manid != SIO_FINTEK_ID) {
+			pr_debug("Not a Fintek device at 0x%08x\n", addr);
+			goto err;
+		}
+	}
+
+	sio->addr = addr;
+	err = 0;
+
+	pr_info("Found %s at %#x\n", f7188x_names[sio->type], (unsigned int)addr);
+	if (sio->type != nct6126d)
+		pr_info("   revision %d\n", superio_inb(addr, SIO_FINTEK_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("Platform data allocation failed\n");
+		goto err;
+	}
+
+	err = platform_device_add(f7188x_gpio_pdev);
+	if (err) {
+		pr_err("Device addition failed\n");
+		goto err;
+	}
+
+	return 0;
+
+err:
+	platform_device_put(f7188x_gpio_pdev);
+
+	return err;
+}
+
+/*
+ * Try to match a supported Fintek 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 = {
+		.name	= DRVNAME,
+	},
+	.probe		= f7188x_gpio_probe,
+};
+
+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 F71869, F71869A, F71882FG, F71889A, F71889F and F81866");
+MODULE_AUTHOR("Simon Guinot <simon.guinot@sequanux.org>");
+MODULE_LICENSE("GPL");