2 * GPIO driver for Fintek Super-I/O F71882 and F71889
4 * Copyright (C) 2010-2013 LaCie
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/platform_device.h>
18 #include <linux/gpio.h>
20 #define DRVNAME "gpio-f7188x"
25 #define SIO_LDSEL 0x07 /* Logical device select */
26 #define SIO_DEVID 0x20 /* Device ID (2 bytes) */
27 #define SIO_DEVREV 0x22 /* Device revision */
28 #define SIO_MANID 0x23 /* Fintek ID (2 bytes) */
30 #define SIO_LD_GPIO 0x06 /* GPIO logical device */
31 #define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */
32 #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */
34 #define SIO_FINTEK_ID 0x1934 /* Manufacturer ID */
35 #define SIO_F71882_ID 0x0541 /* F71882 chipset ID */
36 #define SIO_F71889_ID 0x0909 /* F71889 chipset ID */
38 enum chips { f71882fg, f71889f };
40 static const char * const f7188x_names[] = {
50 struct f7188x_gpio_bank {
51 struct gpio_chip chip;
53 struct f7188x_gpio_data *data;
56 struct f7188x_gpio_data {
57 struct f7188x_sio *sio;
59 struct f7188x_gpio_bank *bank;
63 * Super-I/O functions.
66 static inline int superio_inb(int base, int reg)
72 static int superio_inw(int base, int reg)
77 val = inb(base + 1) << 8;
84 static inline void superio_outb(int base, int reg, int val)
90 static inline int superio_enter(int base)
92 /* Don't step on other drivers' I/O space by accident. */
93 if (!request_muxed_region(base, 2, DRVNAME)) {
94 pr_err(DRVNAME "I/O address 0x%04x already in use\n", base);
98 /* According to the datasheet the key must be send twice. */
99 outb(SIO_UNLOCK_KEY, base);
100 outb(SIO_UNLOCK_KEY, base);
105 static inline void superio_select(int base, int ld)
107 outb(SIO_LDSEL, base);
111 static inline void superio_exit(int base)
113 outb(SIO_LOCK_KEY, base);
114 release_region(base, 2);
121 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset);
122 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset);
123 static int f7188x_gpio_direction_out(struct gpio_chip *chip,
124 unsigned offset, int value);
125 static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value);
127 #define F7188X_GPIO_BANK(_base, _ngpio, _regbase) \
131 .owner = THIS_MODULE, \
132 .direction_input = f7188x_gpio_direction_in, \
133 .get = f7188x_gpio_get, \
134 .direction_output = f7188x_gpio_direction_out, \
135 .set = f7188x_gpio_set, \
140 .regbase = _regbase, \
143 #define gpio_dir(base) (base + 0)
144 #define gpio_data_out(base) (base + 1)
145 #define gpio_data_in(base) (base + 2)
146 /* Output mode register (0:open drain 1:push-pull). */
147 #define gpio_out_mode(base) (base + 3)
149 static struct f7188x_gpio_bank f71882_gpio_bank[] = {
150 F7188X_GPIO_BANK(0 , 8, 0xF0),
151 F7188X_GPIO_BANK(10, 8, 0xE0),
152 F7188X_GPIO_BANK(20, 8, 0xD0),
153 F7188X_GPIO_BANK(30, 4, 0xC0),
154 F7188X_GPIO_BANK(40, 4, 0xB0),
157 static struct f7188x_gpio_bank f71889_gpio_bank[] = {
158 F7188X_GPIO_BANK(0 , 7, 0xF0),
159 F7188X_GPIO_BANK(10, 7, 0xE0),
160 F7188X_GPIO_BANK(20, 8, 0xD0),
161 F7188X_GPIO_BANK(30, 8, 0xC0),
162 F7188X_GPIO_BANK(40, 8, 0xB0),
163 F7188X_GPIO_BANK(50, 5, 0xA0),
164 F7188X_GPIO_BANK(60, 8, 0x90),
165 F7188X_GPIO_BANK(70, 8, 0x80),
168 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
171 struct f7188x_gpio_bank *bank =
172 container_of(chip, struct f7188x_gpio_bank, chip);
173 struct f7188x_sio *sio = bank->data->sio;
176 err = superio_enter(sio->addr);
179 superio_select(sio->addr, SIO_LD_GPIO);
181 dir = superio_inb(sio->addr, gpio_dir(bank->regbase));
182 dir &= ~(1 << offset);
183 superio_outb(sio->addr, gpio_dir(bank->regbase), dir);
185 superio_exit(sio->addr);
190 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset)
193 struct f7188x_gpio_bank *bank =
194 container_of(chip, struct f7188x_gpio_bank, chip);
195 struct f7188x_sio *sio = bank->data->sio;
198 err = superio_enter(sio->addr);
201 superio_select(sio->addr, SIO_LD_GPIO);
203 dir = superio_inb(sio->addr, gpio_dir(bank->regbase));
204 dir = !!(dir & (1 << offset));
206 data = superio_inb(sio->addr, gpio_data_out(bank->regbase));
208 data = superio_inb(sio->addr, gpio_data_in(bank->regbase));
210 superio_exit(sio->addr);
212 return !!(data & 1 << offset);
215 static int f7188x_gpio_direction_out(struct gpio_chip *chip,
216 unsigned offset, int value)
219 struct f7188x_gpio_bank *bank =
220 container_of(chip, struct f7188x_gpio_bank, chip);
221 struct f7188x_sio *sio = bank->data->sio;
224 err = superio_enter(sio->addr);
227 superio_select(sio->addr, SIO_LD_GPIO);
229 data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase));
231 data_out |= (1 << offset);
233 data_out &= ~(1 << offset);
234 superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out);
236 dir = superio_inb(sio->addr, gpio_dir(bank->regbase));
237 dir |= (1 << offset);
238 superio_outb(sio->addr, gpio_dir(bank->regbase), dir);
240 superio_exit(sio->addr);
245 static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
248 struct f7188x_gpio_bank *bank =
249 container_of(chip, struct f7188x_gpio_bank, chip);
250 struct f7188x_sio *sio = bank->data->sio;
253 err = superio_enter(sio->addr);
256 superio_select(sio->addr, SIO_LD_GPIO);
258 data_out = superio_inb(sio->addr, gpio_data_out(bank->regbase));
260 data_out |= (1 << offset);
262 data_out &= ~(1 << offset);
263 superio_outb(sio->addr, gpio_data_out(bank->regbase), data_out);
265 superio_exit(sio->addr);
269 * Platform device and driver.
272 static int f7188x_gpio_probe(struct platform_device *pdev)
276 struct f7188x_sio *sio = pdev->dev.platform_data;
277 struct f7188x_gpio_data *data;
279 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
285 data->nr_bank = ARRAY_SIZE(f71882_gpio_bank);
286 data->bank = f71882_gpio_bank;
289 data->nr_bank = ARRAY_SIZE(f71889_gpio_bank);
290 data->bank = f71889_gpio_bank;
297 platform_set_drvdata(pdev, data);
299 /* For each GPIO bank, register a GPIO chip. */
300 for (i = 0; i < data->nr_bank; i++) {
301 struct f7188x_gpio_bank *bank = &data->bank[i];
303 bank->chip.dev = &pdev->dev;
306 err = gpiochip_add(&bank->chip);
309 "Failed to register gpiochip %d: %d\n",
318 for (i = i - 1; i >= 0; i--) {
319 struct f7188x_gpio_bank *bank = &data->bank[i];
322 tmp = gpiochip_remove(&bank->chip);
325 "Failed to remove gpiochip %d: %d\n",
332 static int f7188x_gpio_remove(struct platform_device *pdev)
336 struct f7188x_gpio_data *data = platform_get_drvdata(pdev);
338 for (i = 0; i < data->nr_bank; i++) {
339 struct f7188x_gpio_bank *bank = &data->bank[i];
341 err = gpiochip_remove(&bank->chip);
344 "Failed to remove GPIO gpiochip %d: %d\n",
353 static int __init f7188x_find(int addr, struct f7188x_sio *sio)
358 err = superio_enter(addr);
363 devid = superio_inw(addr, SIO_MANID);
364 if (devid != SIO_FINTEK_ID) {
365 pr_debug(DRVNAME ": Not a Fintek device at 0x%08x\n", addr);
369 devid = superio_inw(addr, SIO_DEVID);
372 sio->type = f71882fg;
378 pr_info(DRVNAME ": Unsupported Fintek device 0x%04x\n", devid);
384 pr_info(DRVNAME ": Found %s at %#x, revision %d\n",
385 f7188x_names[sio->type],
387 (int) superio_inb(addr, SIO_DEVREV));
394 static struct platform_device *f7188x_gpio_pdev;
397 f7188x_gpio_device_add(const struct f7188x_sio *sio)
401 f7188x_gpio_pdev = platform_device_alloc(DRVNAME, -1);
402 if (!f7188x_gpio_pdev)
405 err = platform_device_add_data(f7188x_gpio_pdev,
408 pr_err(DRVNAME "Platform data allocation failed\n");
412 err = platform_device_add(f7188x_gpio_pdev);
414 pr_err(DRVNAME "Device addition failed\n");
421 platform_device_put(f7188x_gpio_pdev);
427 * Try to match a supported Fintech device by reading the (hard-wired)
428 * configuration I/O ports. If available, then register both the platform
429 * device and driver to support the GPIOs.
432 static struct platform_driver f7188x_gpio_driver = {
434 .owner = THIS_MODULE,
437 .probe = f7188x_gpio_probe,
438 .remove = f7188x_gpio_remove,
441 static int __init f7188x_gpio_init(void)
444 struct f7188x_sio sio;
446 if (f7188x_find(0x2e, &sio) &&
447 f7188x_find(0x4e, &sio))
450 err = platform_driver_register(&f7188x_gpio_driver);
452 err = f7188x_gpio_device_add(&sio);
454 platform_driver_unregister(&f7188x_gpio_driver);
459 subsys_initcall(f7188x_gpio_init);
461 static void __exit f7188x_gpio_exit(void)
463 platform_device_unregister(f7188x_gpio_pdev);
464 platform_driver_unregister(&f7188x_gpio_driver);
466 module_exit(f7188x_gpio_exit);
468 MODULE_DESCRIPTION("GPIO driver for Super-I/O chips F71882FG and F71889F");
470 MODULE_LICENSE("GPL");