1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * GPIO interface for Winbond Super I/O chips
4 * Currently, only W83627UHG (Nuvoton NCT6627UD) is supported.
5 *
6 * Author: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/gpio/driver.h>
12#include <linux/ioport.h>
13#include <linux/isa.h>
14#include <linux/module.h>
15
16#define WB_GPIO_DRIVER_NAME KBUILD_MODNAME
17
18#define WB_SIO_BASE 0x2e
19#define WB_SIO_BASE_HIGH 0x4e
20
21#define WB_SIO_EXT_ENTER_KEY 0x87
22#define WB_SIO_EXT_EXIT_KEY 0xaa
23
24/* global chip registers */
25
26#define WB_SIO_REG_LOGICAL 0x07
27
28#define WB_SIO_REG_CHIP_MSB 0x20
29#define WB_SIO_REG_CHIP_LSB 0x21
30
31#define WB_SIO_CHIP_ID_W83627UHG 0xa230
32#define WB_SIO_CHIP_ID_W83627UHG_MASK GENMASK(15, 4)
33
34#define WB_SIO_REG_DPD 0x22
35#define WB_SIO_REG_DPD_UARTA 4
36#define WB_SIO_REG_DPD_UARTB 5
37
38#define WB_SIO_REG_IDPD 0x23
39#define WB_SIO_REG_IDPD_UARTC 4
40#define WB_SIO_REG_IDPD_UARTD 5
41#define WB_SIO_REG_IDPD_UARTE 6
42#define WB_SIO_REG_IDPD_UARTF 7
43
44#define WB_SIO_REG_GLOBAL_OPT 0x24
45#define WB_SIO_REG_GO_ENFDC 1
46
47#define WB_SIO_REG_OVTGPIO3456 0x29
48#define WB_SIO_REG_OG3456_G3PP 3
49#define WB_SIO_REG_OG3456_G4PP 4
50#define WB_SIO_REG_OG3456_G5PP 5
51#define WB_SIO_REG_OG3456_G6PP 7
52
53#define WB_SIO_REG_I2C_PS 0x2a
54#define WB_SIO_REG_I2CPS_I2CFS 1
55
56#define WB_SIO_REG_GPIO1_MF 0x2c
57#define WB_SIO_REG_G1MF_G1PP 6
58#define WB_SIO_REG_G1MF_G2PP 7
59#define WB_SIO_REG_G1MF_FS_MASK GENMASK(1, 0)
60#define WB_SIO_REG_G1MF_FS_IR_OFF 0
61#define WB_SIO_REG_G1MF_FS_IR 1
62#define WB_SIO_REG_G1MF_FS_GPIO1 2
63#define WB_SIO_REG_G1MF_FS_UARTB 3
64
65/* not an actual device number, just a value meaning 'no device' */
66#define WB_SIO_DEV_NONE 0xff
67
68/* registers with offsets >= 0x30 are specific for a particular device */
69
70/* UART B logical device */
71#define WB_SIO_DEV_UARTB 0x03
72#define WB_SIO_UARTB_REG_ENABLE 0x30
73#define WB_SIO_UARTB_ENABLE_ON 0
74
75/* UART C logical device */
76#define WB_SIO_DEV_UARTC 0x06
77#define WB_SIO_UARTC_REG_ENABLE 0x30
78#define WB_SIO_UARTC_ENABLE_ON 0
79
80/* GPIO3, GPIO4 logical device */
81#define WB_SIO_DEV_GPIO34 0x07
82#define WB_SIO_GPIO34_REG_ENABLE 0x30
83#define WB_SIO_GPIO34_ENABLE_3 0
84#define WB_SIO_GPIO34_ENABLE_4 1
85#define WB_SIO_GPIO34_REG_IO3 0xe0
86#define WB_SIO_GPIO34_REG_DATA3 0xe1
87#define WB_SIO_GPIO34_REG_INV3 0xe2
88#define WB_SIO_GPIO34_REG_IO4 0xe4
89#define WB_SIO_GPIO34_REG_DATA4 0xe5
90#define WB_SIO_GPIO34_REG_INV4 0xe6
91
92/* WDTO, PLED, GPIO5, GPIO6 logical device */
93#define WB_SIO_DEV_WDGPIO56 0x08
94#define WB_SIO_WDGPIO56_REG_ENABLE 0x30
95#define WB_SIO_WDGPIO56_ENABLE_5 1
96#define WB_SIO_WDGPIO56_ENABLE_6 2
97#define WB_SIO_WDGPIO56_REG_IO5 0xe0
98#define WB_SIO_WDGPIO56_REG_DATA5 0xe1
99#define WB_SIO_WDGPIO56_REG_INV5 0xe2
100#define WB_SIO_WDGPIO56_REG_IO6 0xe4
101#define WB_SIO_WDGPIO56_REG_DATA6 0xe5
102#define WB_SIO_WDGPIO56_REG_INV6 0xe6
103
104/* GPIO1, GPIO2, SUSLED logical device */
105#define WB_SIO_DEV_GPIO12 0x09
106#define WB_SIO_GPIO12_REG_ENABLE 0x30
107#define WB_SIO_GPIO12_ENABLE_1 0
108#define WB_SIO_GPIO12_ENABLE_2 1
109#define WB_SIO_GPIO12_REG_IO1 0xe0
110#define WB_SIO_GPIO12_REG_DATA1 0xe1
111#define WB_SIO_GPIO12_REG_INV1 0xe2
112#define WB_SIO_GPIO12_REG_IO2 0xe4
113#define WB_SIO_GPIO12_REG_DATA2 0xe5
114#define WB_SIO_GPIO12_REG_INV2 0xe6
115
116/* UART D logical device */
117#define WB_SIO_DEV_UARTD 0x0d
118#define WB_SIO_UARTD_REG_ENABLE 0x30
119#define WB_SIO_UARTD_ENABLE_ON 0
120
121/* UART E logical device */
122#define WB_SIO_DEV_UARTE 0x0e
123#define WB_SIO_UARTE_REG_ENABLE 0x30
124#define WB_SIO_UARTE_ENABLE_ON 0
125
126/*
127 * for a description what a particular field of this struct means please see
128 * a description of the relevant module parameter at the bottom of this file
129 */
130struct winbond_gpio_params {
131 unsigned long base;
132 unsigned long gpios;
133 unsigned long ppgpios;
134 unsigned long odgpios;
135 bool pledgpio;
136 bool beepgpio;
137 bool i2cgpio;
138};
139
140static struct winbond_gpio_params params;
141
142static int winbond_sio_enter(unsigned long base)
143{
144 if (!request_muxed_region(base, 2, WB_GPIO_DRIVER_NAME))
145 return -EBUSY;
146
147 /*
148 * datasheet says two successive writes of the "key" value are needed
149 * in order for chip to enter the "Extended Function Mode"
150 */
151 outb(WB_SIO_EXT_ENTER_KEY, base);
152 outb(WB_SIO_EXT_ENTER_KEY, base);
153
154 return 0;
155}
156
157static void winbond_sio_select_logical(unsigned long base, u8 dev)
158{
159 outb(WB_SIO_REG_LOGICAL, base);
160 outb(dev, base + 1);
161}
162
163static void winbond_sio_leave(unsigned long base)
164{
165 outb(WB_SIO_EXT_EXIT_KEY, base);
166
167 release_region(base, 2);
168}
169
170static void winbond_sio_reg_write(unsigned long base, u8 reg, u8 data)
171{
172 outb(reg, base);
173 outb(data, base + 1);
174}
175
176static u8 winbond_sio_reg_read(unsigned long base, u8 reg)
177{
178 outb(reg, base);
179 return inb(base + 1);
180}
181
182static void winbond_sio_reg_bset(unsigned long base, u8 reg, u8 bit)
183{
184 u8 val;
185
186 val = winbond_sio_reg_read(base, reg);
187 val |= BIT(bit);
188 winbond_sio_reg_write(base, reg, val);
189}
190
191static void winbond_sio_reg_bclear(unsigned long base, u8 reg, u8 bit)
192{
193 u8 val;
194
195 val = winbond_sio_reg_read(base, reg);
196 val &= ~BIT(bit);
197 winbond_sio_reg_write(base, reg, val);
198}
199
200static bool winbond_sio_reg_btest(unsigned long base, u8 reg, u8 bit)
201{
202 return winbond_sio_reg_read(base, reg) & BIT(bit);
203}
204
205/**
206 * struct winbond_gpio_port_conflict - possibly conflicting device information
207 * @name: device name (NULL means no conflicting device defined)
208 * @dev: Super I/O logical device number where the testreg register
209 * is located (or WB_SIO_DEV_NONE - don't select any
210 * logical device)
211 * @testreg: register number where the testbit bit is located
212 * @testbit: index of a bit to check whether an actual conflict exists
213 * @warnonly: if set then a conflict isn't fatal (just warn about it),
214 * otherwise disable the particular GPIO port if a conflict
215 * is detected
216 */
217struct winbond_gpio_port_conflict {
218 const char *name;
219 u8 dev;
220 u8 testreg;
221 u8 testbit;
222 bool warnonly;
223};
224
225/**
226 * struct winbond_gpio_info - information about a particular GPIO port (device)
227 * @dev: Super I/O logical device number of the registers
228 * specified below
229 * @enablereg: port enable bit register number
230 * @enablebit: index of a port enable bit
231 * @outputreg: output driver mode bit register number
232 * @outputppbit: index of a push-pull output driver mode bit
233 * @ioreg: data direction register number
234 * @invreg: pin data inversion register number
235 * @datareg: pin data register number
236 * @conflict: description of a device that possibly conflicts with
237 * this port
238 */
239struct winbond_gpio_info {
240 u8 dev;
241 u8 enablereg;
242 u8 enablebit;
243 u8 outputreg;
244 u8 outputppbit;
245 u8 ioreg;
246 u8 invreg;
247 u8 datareg;
248 struct winbond_gpio_port_conflict conflict;
249};
250
251static const struct winbond_gpio_info winbond_gpio_infos[6] = {
252 { /* 0 */
253 .dev = WB_SIO_DEV_GPIO12,
254 .enablereg = WB_SIO_GPIO12_REG_ENABLE,
255 .enablebit = WB_SIO_GPIO12_ENABLE_1,
256 .outputreg = WB_SIO_REG_GPIO1_MF,
257 .outputppbit = WB_SIO_REG_G1MF_G1PP,
258 .ioreg = WB_SIO_GPIO12_REG_IO1,
259 .invreg = WB_SIO_GPIO12_REG_INV1,
260 .datareg = WB_SIO_GPIO12_REG_DATA1,
261 .conflict = {
262 .name = "UARTB",
263 .dev = WB_SIO_DEV_UARTB,
264 .testreg = WB_SIO_UARTB_REG_ENABLE,
265 .testbit = WB_SIO_UARTB_ENABLE_ON,
266 .warnonly = true
267 }
268 },
269 { /* 1 */
270 .dev = WB_SIO_DEV_GPIO12,
271 .enablereg = WB_SIO_GPIO12_REG_ENABLE,
272 .enablebit = WB_SIO_GPIO12_ENABLE_2,
273 .outputreg = WB_SIO_REG_GPIO1_MF,
274 .outputppbit = WB_SIO_REG_G1MF_G2PP,
275 .ioreg = WB_SIO_GPIO12_REG_IO2,
276 .invreg = WB_SIO_GPIO12_REG_INV2,
277 .datareg = WB_SIO_GPIO12_REG_DATA2
278 /* special conflict handling so doesn't use conflict data */
279 },
280 { /* 2 */
281 .dev = WB_SIO_DEV_GPIO34,
282 .enablereg = WB_SIO_GPIO34_REG_ENABLE,
283 .enablebit = WB_SIO_GPIO34_ENABLE_3,
284 .outputreg = WB_SIO_REG_OVTGPIO3456,
285 .outputppbit = WB_SIO_REG_OG3456_G3PP,
286 .ioreg = WB_SIO_GPIO34_REG_IO3,
287 .invreg = WB_SIO_GPIO34_REG_INV3,
288 .datareg = WB_SIO_GPIO34_REG_DATA3,
289 .conflict = {
290 .name = "UARTC",
291 .dev = WB_SIO_DEV_UARTC,
292 .testreg = WB_SIO_UARTC_REG_ENABLE,
293 .testbit = WB_SIO_UARTC_ENABLE_ON,
294 .warnonly = true
295 }
296 },
297 { /* 3 */
298 .dev = WB_SIO_DEV_GPIO34,
299 .enablereg = WB_SIO_GPIO34_REG_ENABLE,
300 .enablebit = WB_SIO_GPIO34_ENABLE_4,
301 .outputreg = WB_SIO_REG_OVTGPIO3456,
302 .outputppbit = WB_SIO_REG_OG3456_G4PP,
303 .ioreg = WB_SIO_GPIO34_REG_IO4,
304 .invreg = WB_SIO_GPIO34_REG_INV4,
305 .datareg = WB_SIO_GPIO34_REG_DATA4,
306 .conflict = {
307 .name = "UARTD",
308 .dev = WB_SIO_DEV_UARTD,
309 .testreg = WB_SIO_UARTD_REG_ENABLE,
310 .testbit = WB_SIO_UARTD_ENABLE_ON,
311 .warnonly = true
312 }
313 },
314 { /* 4 */
315 .dev = WB_SIO_DEV_WDGPIO56,
316 .enablereg = WB_SIO_WDGPIO56_REG_ENABLE,
317 .enablebit = WB_SIO_WDGPIO56_ENABLE_5,
318 .outputreg = WB_SIO_REG_OVTGPIO3456,
319 .outputppbit = WB_SIO_REG_OG3456_G5PP,
320 .ioreg = WB_SIO_WDGPIO56_REG_IO5,
321 .invreg = WB_SIO_WDGPIO56_REG_INV5,
322 .datareg = WB_SIO_WDGPIO56_REG_DATA5,
323 .conflict = {
324 .name = "UARTE",
325 .dev = WB_SIO_DEV_UARTE,
326 .testreg = WB_SIO_UARTE_REG_ENABLE,
327 .testbit = WB_SIO_UARTE_ENABLE_ON,
328 .warnonly = true
329 }
330 },
331 { /* 5 */
332 .dev = WB_SIO_DEV_WDGPIO56,
333 .enablereg = WB_SIO_WDGPIO56_REG_ENABLE,
334 .enablebit = WB_SIO_WDGPIO56_ENABLE_6,
335 .outputreg = WB_SIO_REG_OVTGPIO3456,
336 .outputppbit = WB_SIO_REG_OG3456_G6PP,
337 .ioreg = WB_SIO_WDGPIO56_REG_IO6,
338 .invreg = WB_SIO_WDGPIO56_REG_INV6,
339 .datareg = WB_SIO_WDGPIO56_REG_DATA6,
340 .conflict = {
341 .name = "FDC",
342 .dev = WB_SIO_DEV_NONE,
343 .testreg = WB_SIO_REG_GLOBAL_OPT,
344 .testbit = WB_SIO_REG_GO_ENFDC,
345 .warnonly = false
346 }
347 }
348};
349
350/* returns whether changing a pin is allowed */
351static bool winbond_gpio_get_info(unsigned int *gpio_num,
352 const struct winbond_gpio_info **info)
353{
354 bool allow_changing = true;
355 unsigned long i;
356
357 for_each_set_bit(i, &params.gpios, BITS_PER_LONG) {
358 if (*gpio_num < 8)
359 break;
360
361 *gpio_num -= 8;
362 }
363
364 *info = &winbond_gpio_infos[i];
365
366 /*
367 * GPIO2 (the second port) shares some pins with a basic PC
368 * functionality, which is very likely controlled by the firmware.
369 * Don't allow changing these pins by default.
370 */
371 if (i == 1) {
372 if (*gpio_num == 0 && !params.pledgpio)
373 allow_changing = false;
374 else if (*gpio_num == 1 && !params.beepgpio)
375 allow_changing = false;
376 else if ((*gpio_num == 5 || *gpio_num == 6) && !params.i2cgpio)
377 allow_changing = false;
378 }
379
380 return allow_changing;
381}
382
383static int winbond_gpio_get(struct gpio_chip *gc, unsigned int offset)
384{
385 unsigned long *base = gpiochip_get_data(gc);
386 const struct winbond_gpio_info *info;
387 bool val;
388
389 winbond_gpio_get_info(&offset, &info);
390
391 val = winbond_sio_enter(*base);
392 if (val)
393 return val;
394
395 winbond_sio_select_logical(*base, info->dev);
396
397 val = winbond_sio_reg_btest(*base, info->datareg, offset);
398 if (winbond_sio_reg_btest(*base, info->invreg, offset))
399 val = !val;
400
401 winbond_sio_leave(*base);
402
403 return val;
404}
405
406static int winbond_gpio_direction_in(struct gpio_chip *gc, unsigned int offset)
407{
408 unsigned long *base = gpiochip_get_data(gc);
409 const struct winbond_gpio_info *info;
410 int ret;
411
412 if (!winbond_gpio_get_info(&offset, &info))
413 return -EACCES;
414
415 ret = winbond_sio_enter(*base);
416 if (ret)
417 return ret;
418
419 winbond_sio_select_logical(*base, info->dev);
420
421 winbond_sio_reg_bset(*base, info->ioreg, offset);
422
423 winbond_sio_leave(*base);
424
425 return 0;
426}
427
428static int winbond_gpio_direction_out(struct gpio_chip *gc,
429 unsigned int offset,
430 int val)
431{
432 unsigned long *base = gpiochip_get_data(gc);
433 const struct winbond_gpio_info *info;
434 int ret;
435
436 if (!winbond_gpio_get_info(&offset, &info))
437 return -EACCES;
438
439 ret = winbond_sio_enter(*base);
440 if (ret)
441 return ret;
442
443 winbond_sio_select_logical(*base, info->dev);
444
445 winbond_sio_reg_bclear(*base, info->ioreg, offset);
446
447 if (winbond_sio_reg_btest(*base, info->invreg, offset))
448 val = !val;
449
450 if (val)
451 winbond_sio_reg_bset(*base, info->datareg, offset);
452 else
453 winbond_sio_reg_bclear(*base, info->datareg, offset);
454
455 winbond_sio_leave(*base);
456
457 return 0;
458}
459
460static void winbond_gpio_set(struct gpio_chip *gc, unsigned int offset,
461 int val)
462{
463 unsigned long *base = gpiochip_get_data(gc);
464 const struct winbond_gpio_info *info;
465
466 if (!winbond_gpio_get_info(&offset, &info))
467 return;
468
469 if (winbond_sio_enter(*base) != 0)
470 return;
471
472 winbond_sio_select_logical(*base, info->dev);
473
474 if (winbond_sio_reg_btest(*base, info->invreg, offset))
475 val = !val;
476
477 if (val)
478 winbond_sio_reg_bset(*base, info->datareg, offset);
479 else
480 winbond_sio_reg_bclear(*base, info->datareg, offset);
481
482 winbond_sio_leave(*base);
483}
484
485static struct gpio_chip winbond_gpio_chip = {
486 .base = -1,
487 .label = WB_GPIO_DRIVER_NAME,
488 .owner = THIS_MODULE,
489 .can_sleep = true,
490 .get = winbond_gpio_get,
491 .direction_input = winbond_gpio_direction_in,
492 .set = winbond_gpio_set,
493 .direction_output = winbond_gpio_direction_out,
494};
495
496static void winbond_gpio_configure_port0_pins(unsigned long base)
497{
498 unsigned int val;
499
500 val = winbond_sio_reg_read(base, WB_SIO_REG_GPIO1_MF);
501 if ((val & WB_SIO_REG_G1MF_FS_MASK) == WB_SIO_REG_G1MF_FS_GPIO1)
502 return;
503
504 pr_warn("GPIO1 pins were connected to something else (%.2x), fixing\n",
505 val);
506
507 val &= ~WB_SIO_REG_G1MF_FS_MASK;
508 val |= WB_SIO_REG_G1MF_FS_GPIO1;
509
510 winbond_sio_reg_write(base, WB_SIO_REG_GPIO1_MF, val);
511}
512
513static void winbond_gpio_configure_port1_check_i2c(unsigned long base)
514{
515 params.i2cgpio = !winbond_sio_reg_btest(base, WB_SIO_REG_I2C_PS,
516 WB_SIO_REG_I2CPS_I2CFS);
517 if (!params.i2cgpio)
518 pr_warn("disabling GPIO2.5 and GPIO2.6 as I2C is enabled\n");
519}
520
521static bool winbond_gpio_configure_port(unsigned long base, unsigned int idx)
522{
523 const struct winbond_gpio_info *info = &winbond_gpio_infos[idx];
524 const struct winbond_gpio_port_conflict *conflict = &info->conflict;
525
526 /* is there a possible conflicting device defined? */
527 if (conflict->name != NULL) {
528 if (conflict->dev != WB_SIO_DEV_NONE)
529 winbond_sio_select_logical(base, conflict->dev);
530
531 if (winbond_sio_reg_btest(base, conflict->testreg,
532 conflict->testbit)) {
533 if (conflict->warnonly)
534 pr_warn("enabled GPIO%u share pins with active %s\n",
535 idx + 1, conflict->name);
536 else {
537 pr_warn("disabling GPIO%u as %s is enabled\n",
538 idx + 1, conflict->name);
539 return false;
540 }
541 }
542 }
543
544 /* GPIO1 and GPIO2 need some (additional) special handling */
545 if (idx == 0)
546 winbond_gpio_configure_port0_pins(base);
547 else if (idx == 1)
548 winbond_gpio_configure_port1_check_i2c(base);
549
550 winbond_sio_select_logical(base, info->dev);
551
552 winbond_sio_reg_bset(base, info->enablereg, info->enablebit);
553
554 if (params.ppgpios & BIT(idx))
555 winbond_sio_reg_bset(base, info->outputreg,
556 info->outputppbit);
557 else if (params.odgpios & BIT(idx))
558 winbond_sio_reg_bclear(base, info->outputreg,
559 info->outputppbit);
560 else
561 pr_notice("GPIO%u pins are %s\n", idx + 1,
562 winbond_sio_reg_btest(base, info->outputreg,
563 info->outputppbit) ?
564 "push-pull" :
565 "open drain");
566
567 return true;
568}
569
570static int winbond_gpio_configure(unsigned long base)
571{
572 unsigned long i;
573
574 for_each_set_bit(i, &params.gpios, BITS_PER_LONG)
575 if (!winbond_gpio_configure_port(base, i))
576 __clear_bit(i, &params.gpios);
577
578 if (!params.gpios) {
579 pr_err("please use 'gpios' module parameter to select some active GPIO ports to enable\n");
580 return -EINVAL;
581 }
582
583 return 0;
584}
585
586static int winbond_gpio_check_chip(unsigned long base)
587{
588 int ret;
589 unsigned int chip;
590
591 ret = winbond_sio_enter(base);
592 if (ret)
593 return ret;
594
595 chip = winbond_sio_reg_read(base, WB_SIO_REG_CHIP_MSB) << 8;
596 chip |= winbond_sio_reg_read(base, WB_SIO_REG_CHIP_LSB);
597
598 pr_notice("chip ID at %lx is %.4x\n", base, chip);
599
600 if ((chip & WB_SIO_CHIP_ID_W83627UHG_MASK) !=
601 WB_SIO_CHIP_ID_W83627UHG) {
602 pr_err("not an our chip\n");
603 ret = -ENODEV;
604 }
605
606 winbond_sio_leave(base);
607
608 return ret;
609}
610
611static int winbond_gpio_imatch(struct device *dev, unsigned int id)
612{
613 unsigned long gpios_rem;
614 int ret;
615
616 gpios_rem = params.gpios & ~GENMASK(ARRAY_SIZE(winbond_gpio_infos) - 1,
617 0);
618 if (gpios_rem) {
619 pr_warn("unknown ports (%lx) enabled in GPIO ports bitmask\n",
620 gpios_rem);
621 params.gpios &= ~gpios_rem;
622 }
623
624 if (params.ppgpios & params.odgpios) {
625 pr_err("some GPIO ports are set both to push-pull and open drain mode at the same time\n");
626 return 0;
627 }
628
629 if (params.base != 0)
630 return winbond_gpio_check_chip(params.base) == 0;
631
632 /*
633 * if the 'base' module parameter is unset probe two chip default
634 * I/O port bases
635 */
636 params.base = WB_SIO_BASE;
637 ret = winbond_gpio_check_chip(params.base);
638 if (ret == 0)
639 return 1;
640 if (ret != -ENODEV && ret != -EBUSY)
641 return 0;
642
643 params.base = WB_SIO_BASE_HIGH;
644 return winbond_gpio_check_chip(params.base) == 0;
645}
646
647static int winbond_gpio_iprobe(struct device *dev, unsigned int id)
648{
649 int ret;
650
651 if (params.base == 0)
652 return -EINVAL;
653
654 ret = winbond_sio_enter(params.base);
655 if (ret)
656 return ret;
657
658 ret = winbond_gpio_configure(params.base);
659
660 winbond_sio_leave(params.base);
661
662 if (ret)
663 return ret;
664
665 /*
666 * Add 8 gpios for every GPIO port that was enabled in gpios
667 * module parameter (that wasn't disabled earlier in
668 * winbond_gpio_configure() & co. due to, for example, a pin conflict).
669 */
670 winbond_gpio_chip.ngpio = hweight_long(params.gpios) * 8;
671
672 /*
673 * GPIO6 port has only 5 pins, so if it is enabled we have to adjust
674 * the total count appropriately
675 */
676 if (params.gpios & BIT(5))
677 winbond_gpio_chip.ngpio -= (8 - 5);
678
679 winbond_gpio_chip.parent = dev;
680
681 return devm_gpiochip_add_data(dev, &winbond_gpio_chip, &params.base);
682}
683
684static struct isa_driver winbond_gpio_idriver = {
685 .driver = {
686 .name = WB_GPIO_DRIVER_NAME,
687 },
688 .match = winbond_gpio_imatch,
689 .probe = winbond_gpio_iprobe,
690};
691
692module_isa_driver(winbond_gpio_idriver, 1);
693
694module_param_named(base, params.base, ulong, 0444);
695MODULE_PARM_DESC(base,
696 "I/O port base (when unset - probe chip default ones)");
697
698/* This parameter sets which GPIO devices (ports) we enable */
699module_param_named(gpios, params.gpios, ulong, 0444);
700MODULE_PARM_DESC(gpios,
701 "bitmask of GPIO ports to enable (bit 0 - GPIO1, bit 1 - GPIO2, etc.");
702
703/*
704 * These two parameters below set how we configure GPIO ports output drivers.
705 * It can't be a one bitmask since we need three values per port: push-pull,
706 * open-drain and keep as-is (this is the default).
707 */
708module_param_named(ppgpios, params.ppgpios, ulong, 0444);
709MODULE_PARM_DESC(ppgpios,
710 "bitmask of GPIO ports to set to push-pull mode (bit 0 - GPIO1, bit 1 - GPIO2, etc.");
711
712module_param_named(odgpios, params.odgpios, ulong, 0444);
713MODULE_PARM_DESC(odgpios,
714 "bitmask of GPIO ports to set to open drain mode (bit 0 - GPIO1, bit 1 - GPIO2, etc.");
715
716/*
717 * GPIO2.0 and GPIO2.1 control a basic PC functionality that we
718 * don't allow tinkering with by default (it is very likely that the
719 * firmware owns these pins).
720 * These two parameters below allow overriding these prohibitions.
721 */
722module_param_named(pledgpio, params.pledgpio, bool, 0644);
723MODULE_PARM_DESC(pledgpio,
724 "enable changing value of GPIO2.0 bit (Power LED), default no.");
725
726module_param_named(beepgpio, params.beepgpio, bool, 0644);
727MODULE_PARM_DESC(beepgpio,
728 "enable changing value of GPIO2.1 bit (BEEP), default no.");
729
730MODULE_AUTHOR("Maciej S. Szmigiero <mail@maciej.szmigiero.name>");
731MODULE_DESCRIPTION("GPIO interface for Winbond Super I/O chips");
732MODULE_LICENSE("GPL");
733