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x86/speculation: Use Indirect Branch Prediction Barrier in context switch
[linux/fpc-iii.git] / drivers / pinctrl / pinctrl-sx150x.c
blobfb242c542dc926c9392d31b99f937c17215cec81
1 /*
2 * Copyright (c) 2016, BayLibre, SAS. All rights reserved.
3 * Author: Neil Armstrong <narmstrong@baylibre.com>
4 *
5 * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
6 *
7 * Driver for Semtech SX150X I2C GPIO Expanders
8 * The handling of the 4-bit chips (SX1501/SX1504/SX1507) is untested.
9 *
10 * Author: Gregory Bean <gbean@codeaurora.org>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 and
14 * only version 2 as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 */
21
22 #include <linux/regmap.h>
23 #include <linux/i2c.h>
24 #include <linux/init.h>
25 #include <linux/interrupt.h>
26 #include <linux/irq.h>
27 #include <linux/mutex.h>
28 #include <linux/slab.h>
29 #include <linux/of.h>
30 #include <linux/of_device.h>
31 #include <linux/gpio/driver.h>
32 #include <linux/pinctrl/pinconf.h>
33 #include <linux/pinctrl/pinctrl.h>
34 #include <linux/pinctrl/pinmux.h>
35 #include <linux/pinctrl/pinconf-generic.h>
36
37 #include "core.h"
38 #include "pinconf.h"
39 #include "pinctrl-utils.h"
40
41 /* The chip models of sx150x */
42 enum {
43 SX150X_123 = 0,
44 SX150X_456,
45 SX150X_789,
46 };
47 enum {
48 SX150X_789_REG_MISC_AUTOCLEAR_OFF = 1 << 0,
49 SX150X_MAX_REGISTER = 0xad,
50 SX150X_IRQ_TYPE_EDGE_RISING = 0x1,
51 SX150X_IRQ_TYPE_EDGE_FALLING = 0x2,
52 SX150X_789_RESET_KEY1 = 0x12,
53 SX150X_789_RESET_KEY2 = 0x34,
54 };
55
56 struct sx150x_123_pri {
57 u8 reg_pld_mode;
58 u8 reg_pld_table0;
59 u8 reg_pld_table1;
60 u8 reg_pld_table2;
61 u8 reg_pld_table3;
62 u8 reg_pld_table4;
63 u8 reg_advanced;
64 };
65
66 struct sx150x_456_pri {
67 u8 reg_pld_mode;
68 u8 reg_pld_table0;
69 u8 reg_pld_table1;
70 u8 reg_pld_table2;
71 u8 reg_pld_table3;
72 u8 reg_pld_table4;
73 u8 reg_advanced;
74 };
75
76 struct sx150x_789_pri {
77 u8 reg_drain;
78 u8 reg_polarity;
79 u8 reg_clock;
80 u8 reg_misc;
81 u8 reg_reset;
82 u8 ngpios;
83 };
84
85 struct sx150x_device_data {
86 u8 model;
87 u8 reg_pullup;
88 u8 reg_pulldn;
89 u8 reg_dir;
90 u8 reg_data;
91 u8 reg_irq_mask;
92 u8 reg_irq_src;
93 u8 reg_sense;
94 u8 ngpios;
95 union {
96 struct sx150x_123_pri x123;
97 struct sx150x_456_pri x456;
98 struct sx150x_789_pri x789;
99 } pri;
100 const struct pinctrl_pin_desc *pins;
101 unsigned int npins;
102 };
103
104 struct sx150x_pinctrl {
105 struct device *dev;
106 struct i2c_client *client;
107 struct pinctrl_dev *pctldev;
108 struct pinctrl_desc pinctrl_desc;
109 struct gpio_chip gpio;
110 struct irq_chip irq_chip;
111 struct regmap *regmap;
112 struct {
113 u32 sense;
114 u32 masked;
115 } irq;
116 struct mutex lock;
117 const struct sx150x_device_data *data;
118 };
119
120 static const struct pinctrl_pin_desc sx150x_4_pins[] = {
121 PINCTRL_PIN(0, "gpio0"),
122 PINCTRL_PIN(1, "gpio1"),
123 PINCTRL_PIN(2, "gpio2"),
124 PINCTRL_PIN(3, "gpio3"),
125 PINCTRL_PIN(4, "oscio"),
126 };
127
128 static const struct pinctrl_pin_desc sx150x_8_pins[] = {
129 PINCTRL_PIN(0, "gpio0"),
130 PINCTRL_PIN(1, "gpio1"),
131 PINCTRL_PIN(2, "gpio2"),
132 PINCTRL_PIN(3, "gpio3"),
133 PINCTRL_PIN(4, "gpio4"),
134 PINCTRL_PIN(5, "gpio5"),
135 PINCTRL_PIN(6, "gpio6"),
136 PINCTRL_PIN(7, "gpio7"),
137 PINCTRL_PIN(8, "oscio"),
138 };
139
140 static const struct pinctrl_pin_desc sx150x_16_pins[] = {
141 PINCTRL_PIN(0, "gpio0"),
142 PINCTRL_PIN(1, "gpio1"),
143 PINCTRL_PIN(2, "gpio2"),
144 PINCTRL_PIN(3, "gpio3"),
145 PINCTRL_PIN(4, "gpio4"),
146 PINCTRL_PIN(5, "gpio5"),
147 PINCTRL_PIN(6, "gpio6"),
148 PINCTRL_PIN(7, "gpio7"),
149 PINCTRL_PIN(8, "gpio8"),
150 PINCTRL_PIN(9, "gpio9"),
151 PINCTRL_PIN(10, "gpio10"),
152 PINCTRL_PIN(11, "gpio11"),
153 PINCTRL_PIN(12, "gpio12"),
154 PINCTRL_PIN(13, "gpio13"),
155 PINCTRL_PIN(14, "gpio14"),
156 PINCTRL_PIN(15, "gpio15"),
157 PINCTRL_PIN(16, "oscio"),
158 };
159
160 static const struct sx150x_device_data sx1501q_device_data = {
161 .model = SX150X_123,
162 .reg_pullup = 0x02,
163 .reg_pulldn = 0x03,
164 .reg_dir = 0x01,
165 .reg_data = 0x00,
166 .reg_irq_mask = 0x05,
167 .reg_irq_src = 0x08,
168 .reg_sense = 0x07,
169 .pri.x123 = {
170 .reg_pld_mode = 0x10,
171 .reg_pld_table0 = 0x11,
172 .reg_pld_table2 = 0x13,
173 .reg_advanced = 0xad,
174 },
175 .ngpios = 4,
176 .pins = sx150x_4_pins,
177 .npins = 4, /* oscio not available */
178 };
179
180 static const struct sx150x_device_data sx1502q_device_data = {
181 .model = SX150X_123,
182 .reg_pullup = 0x02,
183 .reg_pulldn = 0x03,
184 .reg_dir = 0x01,
185 .reg_data = 0x00,
186 .reg_irq_mask = 0x05,
187 .reg_irq_src = 0x08,
188 .reg_sense = 0x06,
189 .pri.x123 = {
190 .reg_pld_mode = 0x10,
191 .reg_pld_table0 = 0x11,
192 .reg_pld_table1 = 0x12,
193 .reg_pld_table2 = 0x13,
194 .reg_pld_table3 = 0x14,
195 .reg_pld_table4 = 0x15,
196 .reg_advanced = 0xad,
197 },
198 .ngpios = 8,
199 .pins = sx150x_8_pins,
200 .npins = 8, /* oscio not available */
201 };
202
203 static const struct sx150x_device_data sx1503q_device_data = {
204 .model = SX150X_123,
205 .reg_pullup = 0x04,
206 .reg_pulldn = 0x06,
207 .reg_dir = 0x02,
208 .reg_data = 0x00,
209 .reg_irq_mask = 0x08,
210 .reg_irq_src = 0x0e,
211 .reg_sense = 0x0a,
212 .pri.x123 = {
213 .reg_pld_mode = 0x20,
214 .reg_pld_table0 = 0x22,
215 .reg_pld_table1 = 0x24,
216 .reg_pld_table2 = 0x26,
217 .reg_pld_table3 = 0x28,
218 .reg_pld_table4 = 0x2a,
219 .reg_advanced = 0xad,
220 },
221 .ngpios = 16,
222 .pins = sx150x_16_pins,
223 .npins = 16, /* oscio not available */
224 };
225
226 static const struct sx150x_device_data sx1504q_device_data = {
227 .model = SX150X_456,
228 .reg_pullup = 0x02,
229 .reg_pulldn = 0x03,
230 .reg_dir = 0x01,
231 .reg_data = 0x00,
232 .reg_irq_mask = 0x05,
233 .reg_irq_src = 0x08,
234 .reg_sense = 0x07,
235 .pri.x456 = {
236 .reg_pld_mode = 0x10,
237 .reg_pld_table0 = 0x11,
238 .reg_pld_table2 = 0x13,
239 },
240 .ngpios = 4,
241 .pins = sx150x_4_pins,
242 .npins = 4, /* oscio not available */
243 };
244
245 static const struct sx150x_device_data sx1505q_device_data = {
246 .model = SX150X_456,
247 .reg_pullup = 0x02,
248 .reg_pulldn = 0x03,
249 .reg_dir = 0x01,
250 .reg_data = 0x00,
251 .reg_irq_mask = 0x05,
252 .reg_irq_src = 0x08,
253 .reg_sense = 0x06,
254 .pri.x456 = {
255 .reg_pld_mode = 0x10,
256 .reg_pld_table0 = 0x11,
257 .reg_pld_table1 = 0x12,
258 .reg_pld_table2 = 0x13,
259 .reg_pld_table3 = 0x14,
260 .reg_pld_table4 = 0x15,
261 },
262 .ngpios = 8,
263 .pins = sx150x_8_pins,
264 .npins = 8, /* oscio not available */
265 };
266
267 static const struct sx150x_device_data sx1506q_device_data = {
268 .model = SX150X_456,
269 .reg_pullup = 0x04,
270 .reg_pulldn = 0x06,
271 .reg_dir = 0x02,
272 .reg_data = 0x00,
273 .reg_irq_mask = 0x08,
274 .reg_irq_src = 0x0e,
275 .reg_sense = 0x0a,
276 .pri.x456 = {
277 .reg_pld_mode = 0x20,
278 .reg_pld_table0 = 0x22,
279 .reg_pld_table1 = 0x24,
280 .reg_pld_table2 = 0x26,
281 .reg_pld_table3 = 0x28,
282 .reg_pld_table4 = 0x2a,
283 .reg_advanced = 0xad,
284 },
285 .ngpios = 16,
286 .pins = sx150x_16_pins,
287 .npins = 16, /* oscio not available */
288 };
289
290 static const struct sx150x_device_data sx1507q_device_data = {
291 .model = SX150X_789,
292 .reg_pullup = 0x03,
293 .reg_pulldn = 0x04,
294 .reg_dir = 0x07,
295 .reg_data = 0x08,
296 .reg_irq_mask = 0x09,
297 .reg_irq_src = 0x0b,
298 .reg_sense = 0x0a,
299 .pri.x789 = {
300 .reg_drain = 0x05,
301 .reg_polarity = 0x06,
302 .reg_clock = 0x0d,
303 .reg_misc = 0x0e,
304 .reg_reset = 0x7d,
305 },
306 .ngpios = 4,
307 .pins = sx150x_4_pins,
308 .npins = ARRAY_SIZE(sx150x_4_pins),
309 };
310
311 static const struct sx150x_device_data sx1508q_device_data = {
312 .model = SX150X_789,
313 .reg_pullup = 0x03,
314 .reg_pulldn = 0x04,
315 .reg_dir = 0x07,
316 .reg_data = 0x08,
317 .reg_irq_mask = 0x09,
318 .reg_irq_src = 0x0c,
319 .reg_sense = 0x0a,
320 .pri.x789 = {
321 .reg_drain = 0x05,
322 .reg_polarity = 0x06,
323 .reg_clock = 0x0f,
324 .reg_misc = 0x10,
325 .reg_reset = 0x7d,
326 },
327 .ngpios = 8,
328 .pins = sx150x_8_pins,
329 .npins = ARRAY_SIZE(sx150x_8_pins),
330 };
331
332 static const struct sx150x_device_data sx1509q_device_data = {
333 .model = SX150X_789,
334 .reg_pullup = 0x06,
335 .reg_pulldn = 0x08,
336 .reg_dir = 0x0e,
337 .reg_data = 0x10,
338 .reg_irq_mask = 0x12,
339 .reg_irq_src = 0x18,
340 .reg_sense = 0x14,
341 .pri.x789 = {
342 .reg_drain = 0x0a,
343 .reg_polarity = 0x0c,
344 .reg_clock = 0x1e,
345 .reg_misc = 0x1f,
346 .reg_reset = 0x7d,
347 },
348 .ngpios = 16,
349 .pins = sx150x_16_pins,
350 .npins = ARRAY_SIZE(sx150x_16_pins),
351 };
352
353 static int sx150x_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
354 {
355 return 0;
356 }
357
358 static const char *sx150x_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
359 unsigned int group)
360 {
361 return NULL;
362 }
363
364 static int sx150x_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
365 unsigned int group,
366 const unsigned int **pins,
367 unsigned int *num_pins)
368 {
369 return -ENOTSUPP;
370 }
371
372 static const struct pinctrl_ops sx150x_pinctrl_ops = {
373 .get_groups_count = sx150x_pinctrl_get_groups_count,
374 .get_group_name = sx150x_pinctrl_get_group_name,
375 .get_group_pins = sx150x_pinctrl_get_group_pins,
376 #ifdef CONFIG_OF
377 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
378 .dt_free_map = pinctrl_utils_free_map,
379 #endif
380 };
381
382 static bool sx150x_pin_is_oscio(struct sx150x_pinctrl *pctl, unsigned int pin)
383 {
384 if (pin >= pctl->data->npins)
385 return false;
386
387 /* OSCIO pin is only present in 789 devices */
388 if (pctl->data->model != SX150X_789)
389 return false;
390
391 return !strcmp(pctl->data->pins[pin].name, "oscio");
392 }
393
394 static int sx150x_gpio_get_direction(struct gpio_chip *chip,
395 unsigned int offset)
396 {
397 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
398 unsigned int value;
399 int ret;
400
401 if (sx150x_pin_is_oscio(pctl, offset))
402 return false;
403
404 ret = regmap_read(pctl->regmap, pctl->data->reg_dir, &value);
405 if (ret < 0)
406 return ret;
407
408 return !!(value & BIT(offset));
409 }
410
411 static int sx150x_gpio_get(struct gpio_chip *chip, unsigned int offset)
412 {
413 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
414 unsigned int value;
415 int ret;
416
417 if (sx150x_pin_is_oscio(pctl, offset))
418 return -EINVAL;
419
420 ret = regmap_read(pctl->regmap, pctl->data->reg_data, &value);
421 if (ret < 0)
422 return ret;
423
424 return !!(value & BIT(offset));
425 }
426
427 static int __sx150x_gpio_set(struct sx150x_pinctrl *pctl, unsigned int offset,
428 int value)
429 {
430 return regmap_write_bits(pctl->regmap, pctl->data->reg_data,
431 BIT(offset), value ? BIT(offset) : 0);
432 }
433
434 static int sx150x_gpio_oscio_set(struct sx150x_pinctrl *pctl,
435 int value)
436 {
437 return regmap_write(pctl->regmap,
438 pctl->data->pri.x789.reg_clock,
439 (value ? 0x1f : 0x10));
440 }
441
442 static void sx150x_gpio_set(struct gpio_chip *chip, unsigned int offset,
443 int value)
444 {
445 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
446
447 if (sx150x_pin_is_oscio(pctl, offset))
448 sx150x_gpio_oscio_set(pctl, value);
449 else
450 __sx150x_gpio_set(pctl, offset, value);
451
452 }
453
454 static void sx150x_gpio_set_multiple(struct gpio_chip *chip,
455 unsigned long *mask,
456 unsigned long *bits)
457 {
458 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
459
460 regmap_write_bits(pctl->regmap, pctl->data->reg_data, *mask, *bits);
461 }
462
463 static int sx150x_gpio_direction_input(struct gpio_chip *chip,
464 unsigned int offset)
465 {
466 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
467
468 if (sx150x_pin_is_oscio(pctl, offset))
469 return -EINVAL;
470
471 return regmap_write_bits(pctl->regmap,
472 pctl->data->reg_dir,
473 BIT(offset), BIT(offset));
474 }
475
476 static int sx150x_gpio_direction_output(struct gpio_chip *chip,
477 unsigned int offset, int value)
478 {
479 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
480 int ret;
481
482 if (sx150x_pin_is_oscio(pctl, offset))
483 return sx150x_gpio_oscio_set(pctl, value);
484
485 ret = __sx150x_gpio_set(pctl, offset, value);
486 if (ret < 0)
487 return ret;
488
489 return regmap_write_bits(pctl->regmap,
490 pctl->data->reg_dir,
491 BIT(offset), 0);
492 }
493
494 static void sx150x_irq_mask(struct irq_data *d)
495 {
496 struct sx150x_pinctrl *pctl =
497 gpiochip_get_data(irq_data_get_irq_chip_data(d));
498 unsigned int n = d->hwirq;
499
500 pctl->irq.masked |= BIT(n);
501 }
502
503 static void sx150x_irq_unmask(struct irq_data *d)
504 {
505 struct sx150x_pinctrl *pctl =
506 gpiochip_get_data(irq_data_get_irq_chip_data(d));
507 unsigned int n = d->hwirq;
508
509 pctl->irq.masked &= ~BIT(n);
510 }
511
512 static void sx150x_irq_set_sense(struct sx150x_pinctrl *pctl,
513 unsigned int line, unsigned int sense)
514 {
515 /*
516 * Every interrupt line is represented by two bits shifted
517 * proportionally to the line number
518 */
519 const unsigned int n = line * 2;
520 const unsigned int mask = ~((SX150X_IRQ_TYPE_EDGE_RISING |
521 SX150X_IRQ_TYPE_EDGE_FALLING) << n);
522
523 pctl->irq.sense &= mask;
524 pctl->irq.sense |= sense << n;
525 }
526
527 static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
528 {
529 struct sx150x_pinctrl *pctl =
530 gpiochip_get_data(irq_data_get_irq_chip_data(d));
531 unsigned int n, val = 0;
532
533 if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
534 return -EINVAL;
535
536 n = d->hwirq;
537
538 if (flow_type & IRQ_TYPE_EDGE_RISING)
539 val |= SX150X_IRQ_TYPE_EDGE_RISING;
540 if (flow_type & IRQ_TYPE_EDGE_FALLING)
541 val |= SX150X_IRQ_TYPE_EDGE_FALLING;
542
543 sx150x_irq_set_sense(pctl, n, val);
544 return 0;
545 }
546
547 static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
548 {
549 struct sx150x_pinctrl *pctl = (struct sx150x_pinctrl *)dev_id;
550 unsigned long n, status;
551 unsigned int val;
552 int err;
553
554 err = regmap_read(pctl->regmap, pctl->data->reg_irq_src, &val);
555 if (err < 0)
556 return IRQ_NONE;
557
558 err = regmap_write(pctl->regmap, pctl->data->reg_irq_src, val);
559 if (err < 0)
560 return IRQ_NONE;
561
562 status = val;
563 for_each_set_bit(n, &status, pctl->data->ngpios)
564 handle_nested_irq(irq_find_mapping(pctl->gpio.irq.domain, n));
565
566 return IRQ_HANDLED;
567 }
568
569 static void sx150x_irq_bus_lock(struct irq_data *d)
570 {
571 struct sx150x_pinctrl *pctl =
572 gpiochip_get_data(irq_data_get_irq_chip_data(d));
573
574 mutex_lock(&pctl->lock);
575 }
576
577 static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
578 {
579 struct sx150x_pinctrl *pctl =
580 gpiochip_get_data(irq_data_get_irq_chip_data(d));
581
582 regmap_write(pctl->regmap, pctl->data->reg_irq_mask, pctl->irq.masked);
583 regmap_write(pctl->regmap, pctl->data->reg_sense, pctl->irq.sense);
584 mutex_unlock(&pctl->lock);
585 }
586
587 static int sx150x_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
588 unsigned long *config)
589 {
590 struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
591 unsigned int param = pinconf_to_config_param(*config);
592 int ret;
593 u32 arg;
594 unsigned int data;
595
596 if (sx150x_pin_is_oscio(pctl, pin)) {
597 switch (param) {
598 case PIN_CONFIG_DRIVE_PUSH_PULL:
599 case PIN_CONFIG_OUTPUT:
600 ret = regmap_read(pctl->regmap,
601 pctl->data->pri.x789.reg_clock,
602 &data);
603 if (ret < 0)
604 return ret;
605
606 if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
607 arg = (data & 0x1f) ? 1 : 0;
608 else {
609 if ((data & 0x1f) == 0x1f)
610 arg = 1;
611 else if ((data & 0x1f) == 0x10)
612 arg = 0;
613 else
614 return -EINVAL;
615 }
616
617 break;
618 default:
619 return -ENOTSUPP;
620 }
621
622 goto out;
623 }
624
625 switch (param) {
626 case PIN_CONFIG_BIAS_PULL_DOWN:
627 ret = regmap_read(pctl->regmap,
628 pctl->data->reg_pulldn,
629 &data);
630 data &= BIT(pin);
631
632 if (ret < 0)
633 return ret;
634
635 if (!ret)
636 return -EINVAL;
637
638 arg = 1;
639 break;
640
641 case PIN_CONFIG_BIAS_PULL_UP:
642 ret = regmap_read(pctl->regmap,
643 pctl->data->reg_pullup,
644 &data);
645 data &= BIT(pin);
646
647 if (ret < 0)
648 return ret;
649
650 if (!ret)
651 return -EINVAL;
652
653 arg = 1;
654 break;
655
656 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
657 if (pctl->data->model != SX150X_789)
658 return -ENOTSUPP;
659
660 ret = regmap_read(pctl->regmap,
661 pctl->data->pri.x789.reg_drain,
662 &data);
663 data &= BIT(pin);
664
665 if (ret < 0)
666 return ret;
667
668 if (!data)
669 return -EINVAL;
670
671 arg = 1;
672 break;
673
674 case PIN_CONFIG_DRIVE_PUSH_PULL:
675 if (pctl->data->model != SX150X_789)
676 arg = true;
677 else {
678 ret = regmap_read(pctl->regmap,
679 pctl->data->pri.x789.reg_drain,
680 &data);
681 data &= BIT(pin);
682
683 if (ret < 0)
684 return ret;
685
686 if (data)
687 return -EINVAL;
688
689 arg = 1;
690 }
691 break;
692
693 case PIN_CONFIG_OUTPUT:
694 ret = sx150x_gpio_get_direction(&pctl->gpio, pin);
695 if (ret < 0)
696 return ret;
697
698 if (ret)
699 return -EINVAL;
700
701 ret = sx150x_gpio_get(&pctl->gpio, pin);
702 if (ret < 0)
703 return ret;
704
705 arg = ret;
706 break;
707
708 default:
709 return -ENOTSUPP;
710 }
711
712 out:
713 *config = pinconf_to_config_packed(param, arg);
714
715 return 0;
716 }
717
718 static int sx150x_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
719 unsigned long *configs, unsigned int num_configs)
720 {
721 struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
722 enum pin_config_param param;
723 u32 arg;
724 int i;
725 int ret;
726
727 for (i = 0; i < num_configs; i++) {
728 param = pinconf_to_config_param(configs[i]);
729 arg = pinconf_to_config_argument(configs[i]);
730
731 if (sx150x_pin_is_oscio(pctl, pin)) {
732 if (param == PIN_CONFIG_OUTPUT) {
733 ret = sx150x_gpio_direction_output(&pctl->gpio,
734 pin, arg);
735 if (ret < 0)
736 return ret;
737
738 continue;
739 } else
740 return -ENOTSUPP;
741 }
742
743 switch (param) {
744 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
745 case PIN_CONFIG_BIAS_DISABLE:
746 ret = regmap_write_bits(pctl->regmap,
747 pctl->data->reg_pulldn,
748 BIT(pin), 0);
749 if (ret < 0)
750 return ret;
751
752 ret = regmap_write_bits(pctl->regmap,
753 pctl->data->reg_pullup,
754 BIT(pin), 0);
755 if (ret < 0)
756 return ret;
757
758 break;
759
760 case PIN_CONFIG_BIAS_PULL_UP:
761 ret = regmap_write_bits(pctl->regmap,
762 pctl->data->reg_pullup,
763 BIT(pin), BIT(pin));
764 if (ret < 0)
765 return ret;
766
767 break;
768
769 case PIN_CONFIG_BIAS_PULL_DOWN:
770 ret = regmap_write_bits(pctl->regmap,
771 pctl->data->reg_pulldn,
772 BIT(pin), BIT(pin));
773 if (ret < 0)
774 return ret;
775
776 break;
777
778 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
779 if (pctl->data->model != SX150X_789 ||
780 sx150x_pin_is_oscio(pctl, pin))
781 return -ENOTSUPP;
782
783 ret = regmap_write_bits(pctl->regmap,
784 pctl->data->pri.x789.reg_drain,
785 BIT(pin), BIT(pin));
786 if (ret < 0)
787 return ret;
788
789 break;
790
791 case PIN_CONFIG_DRIVE_PUSH_PULL:
792 if (pctl->data->model != SX150X_789 ||
793 sx150x_pin_is_oscio(pctl, pin))
794 return 0;
795
796 ret = regmap_write_bits(pctl->regmap,
797 pctl->data->pri.x789.reg_drain,
798 BIT(pin), 0);
799 if (ret < 0)
800 return ret;
801
802 break;
803
804 case PIN_CONFIG_OUTPUT:
805 ret = sx150x_gpio_direction_output(&pctl->gpio,
806 pin, arg);
807 if (ret < 0)
808 return ret;
809
810 break;
811
812 default:
813 return -ENOTSUPP;
814 }
815 } /* for each config */
816
817 return 0;
818 }
819
820 static const struct pinconf_ops sx150x_pinconf_ops = {
821 .pin_config_get = sx150x_pinconf_get,
822 .pin_config_set = sx150x_pinconf_set,
823 .is_generic = true,
824 };
825
826 static const struct i2c_device_id sx150x_id[] = {
827 {"sx1501q", (kernel_ulong_t) &sx1501q_device_data },
828 {"sx1502q", (kernel_ulong_t) &sx1502q_device_data },
829 {"sx1503q", (kernel_ulong_t) &sx1503q_device_data },
830 {"sx1504q", (kernel_ulong_t) &sx1504q_device_data },
831 {"sx1505q", (kernel_ulong_t) &sx1505q_device_data },
832 {"sx1506q", (kernel_ulong_t) &sx1506q_device_data },
833 {"sx1507q", (kernel_ulong_t) &sx1507q_device_data },
834 {"sx1508q", (kernel_ulong_t) &sx1508q_device_data },
835 {"sx1509q", (kernel_ulong_t) &sx1509q_device_data },
836 {}
837 };
838
839 static const struct of_device_id sx150x_of_match[] = {
840 { .compatible = "semtech,sx1501q", .data = &sx1501q_device_data },
841 { .compatible = "semtech,sx1502q", .data = &sx1502q_device_data },
842 { .compatible = "semtech,sx1503q", .data = &sx1503q_device_data },
843 { .compatible = "semtech,sx1504q", .data = &sx1504q_device_data },
844 { .compatible = "semtech,sx1505q", .data = &sx1505q_device_data },
845 { .compatible = "semtech,sx1506q", .data = &sx1506q_device_data },
846 { .compatible = "semtech,sx1507q", .data = &sx1507q_device_data },
847 { .compatible = "semtech,sx1508q", .data = &sx1508q_device_data },
848 { .compatible = "semtech,sx1509q", .data = &sx1509q_device_data },
849 {},
850 };
851
852 static int sx150x_reset(struct sx150x_pinctrl *pctl)
853 {
854 int err;
855
856 err = i2c_smbus_write_byte_data(pctl->client,
857 pctl->data->pri.x789.reg_reset,
858 SX150X_789_RESET_KEY1);
859 if (err < 0)
860 return err;
861
862 err = i2c_smbus_write_byte_data(pctl->client,
863 pctl->data->pri.x789.reg_reset,
864 SX150X_789_RESET_KEY2);
865 return err;
866 }
867
868 static int sx150x_init_misc(struct sx150x_pinctrl *pctl)
869 {
870 u8 reg, value;
871
872 switch (pctl->data->model) {
873 case SX150X_789:
874 reg = pctl->data->pri.x789.reg_misc;
875 value = SX150X_789_REG_MISC_AUTOCLEAR_OFF;
876 break;
877 case SX150X_456:
878 reg = pctl->data->pri.x456.reg_advanced;
879 value = 0x00;
880
881 /*
882 * Only SX1506 has RegAdvanced, SX1504/5 are expected
883 * to initialize this offset to zero
884 */
885 if (!reg)
886 return 0;
887 break;
888 case SX150X_123:
889 reg = pctl->data->pri.x123.reg_advanced;
890 value = 0x00;
891 break;
892 default:
893 WARN(1, "Unknown chip model %d\n", pctl->data->model);
894 return -EINVAL;
895 }
896
897 return regmap_write(pctl->regmap, reg, value);
898 }
899
900 static int sx150x_init_hw(struct sx150x_pinctrl *pctl)
901 {
902 const u8 reg[] = {
903 [SX150X_789] = pctl->data->pri.x789.reg_polarity,
904 [SX150X_456] = pctl->data->pri.x456.reg_pld_mode,
905 [SX150X_123] = pctl->data->pri.x123.reg_pld_mode,
906 };
907 int err;
908
909 if (pctl->data->model == SX150X_789 &&
910 of_property_read_bool(pctl->dev->of_node, "semtech,probe-reset")) {
911 err = sx150x_reset(pctl);
912 if (err < 0)
913 return err;
914 }
915
916 err = sx150x_init_misc(pctl);
917 if (err < 0)
918 return err;
919
920 /* Set all pins to work in normal mode */
921 return regmap_write(pctl->regmap, reg[pctl->data->model], 0);
922 }
923
924 static int sx150x_regmap_reg_width(struct sx150x_pinctrl *pctl,
925 unsigned int reg)
926 {
927 const struct sx150x_device_data *data = pctl->data;
928
929 if (reg == data->reg_sense) {
930 /*
931 * RegSense packs two bits of configuration per GPIO,
932 * so we'd need to read twice as many bits as there
933 * are GPIO in our chip
934 */
935 return 2 * data->ngpios;
936 } else if ((data->model == SX150X_789 &&
937 (reg == data->pri.x789.reg_misc ||
938 reg == data->pri.x789.reg_clock ||
939 reg == data->pri.x789.reg_reset))
940 ||
941 (data->model == SX150X_123 &&
942 reg == data->pri.x123.reg_advanced)
943 ||
944 (data->model == SX150X_456 &&
945 data->pri.x456.reg_advanced &&
946 reg == data->pri.x456.reg_advanced)) {
947 return 8;
948 } else {
949 return data->ngpios;
950 }
951 }
952
953 static unsigned int sx150x_maybe_swizzle(struct sx150x_pinctrl *pctl,
954 unsigned int reg, unsigned int val)
955 {
956 unsigned int a, b;
957 const struct sx150x_device_data *data = pctl->data;
958
959 /*
960 * Whereas SX1509 presents RegSense in a simple layout as such:
961 * reg [ f f e e d d c c ]
962 * reg + 1 [ b b a a 9 9 8 8 ]
963 * reg + 2 [ 7 7 6 6 5 5 4 4 ]
964 * reg + 3 [ 3 3 2 2 1 1 0 0 ]
965 *
966 * SX1503 and SX1506 deviate from that data layout, instead storing
967 * their contents as follows:
968 *
969 * reg [ f f e e d d c c ]
970 * reg + 1 [ 7 7 6 6 5 5 4 4 ]
971 * reg + 2 [ b b a a 9 9 8 8 ]
972 * reg + 3 [ 3 3 2 2 1 1 0 0 ]
973 *
974 * so, taking that into account, we swap two
975 * inner bytes of a 4-byte result
976 */
977
978 if (reg == data->reg_sense &&
979 data->ngpios == 16 &&
980 (data->model == SX150X_123 ||
981 data->model == SX150X_456)) {
982 a = val & 0x00ff0000;
983 b = val & 0x0000ff00;
984
985 val &= 0xff0000ff;
986 val |= b << 8;
987 val |= a >> 8;
988 }
989
990 return val;
991 }
992
993 /*
994 * In order to mask the differences between 16 and 8 bit expander
995 * devices we set up a sligthly ficticious regmap that pretends to be
996 * a set of 32-bit (to accomodate RegSenseLow/RegSenseHigh
997 * pair/quartet) registers and transparently reconstructs those
998 * registers via multiple I2C/SMBus reads
999 *
1000 * This way the rest of the driver code, interfacing with the chip via
1001 * regmap API, can work assuming that each GPIO pin is represented by
1002 * a group of bits at an offset proportional to GPIO number within a
1003 * given register.
1004 */
1005 static int sx150x_regmap_reg_read(void *context, unsigned int reg,
1006 unsigned int *result)
1007 {
1008 int ret, n;
1009 struct sx150x_pinctrl *pctl = context;
1010 struct i2c_client *i2c = pctl->client;
1011 const int width = sx150x_regmap_reg_width(pctl, reg);
1012 unsigned int idx, val;
1013
1014 /*
1015 * There are four potential cases covered by this function:
1016 *
1017 * 1) 8-pin chip, single configuration bit register
1018 *
1019 * This is trivial the code below just needs to read:
1020 * reg [ 7 6 5 4 3 2 1 0 ]
1021 *
1022 * 2) 8-pin chip, double configuration bit register (RegSense)
1023 *
1024 * The read will be done as follows:
1025 * reg [ 7 7 6 6 5 5 4 4 ]
1026 * reg + 1 [ 3 3 2 2 1 1 0 0 ]
1027 *
1028 * 3) 16-pin chip, single configuration bit register
1029 *
1030 * The read will be done as follows:
1031 * reg [ f e d c b a 9 8 ]
1032 * reg + 1 [ 7 6 5 4 3 2 1 0 ]
1033 *
1034 * 4) 16-pin chip, double configuration bit register (RegSense)
1035 *
1036 * The read will be done as follows:
1037 * reg [ f f e e d d c c ]
1038 * reg + 1 [ b b a a 9 9 8 8 ]
1039 * reg + 2 [ 7 7 6 6 5 5 4 4 ]
1040 * reg + 3 [ 3 3 2 2 1 1 0 0 ]
1041 */
1042
1043 for (n = width, val = 0, idx = reg; n > 0; n -= 8, idx++) {
1044 val <<= 8;
1045
1046 ret = i2c_smbus_read_byte_data(i2c, idx);
1047 if (ret < 0)
1048 return ret;
1049
1050 val |= ret;
1051 }
1052
1053 *result = sx150x_maybe_swizzle(pctl, reg, val);
1054
1055 return 0;
1056 }
1057
1058 static int sx150x_regmap_reg_write(void *context, unsigned int reg,
1059 unsigned int val)
1060 {
1061 int ret, n;
1062 struct sx150x_pinctrl *pctl = context;
1063 struct i2c_client *i2c = pctl->client;
1064 const int width = sx150x_regmap_reg_width(pctl, reg);
1065
1066 val = sx150x_maybe_swizzle(pctl, reg, val);
1067
1068 n = (width - 1) & ~7;
1069 do {
1070 const u8 byte = (val >> n) & 0xff;
1071
1072 ret = i2c_smbus_write_byte_data(i2c, reg, byte);
1073 if (ret < 0)
1074 return ret;
1075
1076 reg++;
1077 n -= 8;
1078 } while (n >= 0);
1079
1080 return 0;
1081 }
1082
1083 static bool sx150x_reg_volatile(struct device *dev, unsigned int reg)
1084 {
1085 struct sx150x_pinctrl *pctl = i2c_get_clientdata(to_i2c_client(dev));
1086
1087 return reg == pctl->data->reg_irq_src || reg == pctl->data->reg_data;
1088 }
1089
1090 static const struct regmap_config sx150x_regmap_config = {
1091 .reg_bits = 8,
1092 .val_bits = 32,
1093
1094 .cache_type = REGCACHE_RBTREE,
1095
1096 .reg_read = sx150x_regmap_reg_read,
1097 .reg_write = sx150x_regmap_reg_write,
1098
1099 .max_register = SX150X_MAX_REGISTER,
1100 .volatile_reg = sx150x_reg_volatile,
1101 };
1102
1103 static int sx150x_probe(struct i2c_client *client,
1104 const struct i2c_device_id *id)
1105 {
1106 static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
1107 I2C_FUNC_SMBUS_WRITE_WORD_DATA;
1108 struct device *dev = &client->dev;
1109 struct sx150x_pinctrl *pctl;
1110 int ret;
1111
1112 if (!i2c_check_functionality(client->adapter, i2c_funcs))
1113 return -ENOSYS;
1114
1115 pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
1116 if (!pctl)
1117 return -ENOMEM;
1118
1119 i2c_set_clientdata(client, pctl);
1120
1121 pctl->dev = dev;
1122 pctl->client = client;
1123
1124 if (dev->of_node)
1125 pctl->data = of_device_get_match_data(dev);
1126 else
1127 pctl->data = (struct sx150x_device_data *)id->driver_data;
1128
1129 if (!pctl->data)
1130 return -EINVAL;
1131
1132 pctl->regmap = devm_regmap_init(dev, NULL, pctl,
1133 &sx150x_regmap_config);
1134 if (IS_ERR(pctl->regmap)) {
1135 ret = PTR_ERR(pctl->regmap);
1136 dev_err(dev, "Failed to allocate register map: %d\n",
1137 ret);
1138 return ret;
1139 }
1140
1141 mutex_init(&pctl->lock);
1142
1143 ret = sx150x_init_hw(pctl);
1144 if (ret)
1145 return ret;
1146
1147 /* Register GPIO controller */
1148 pctl->gpio.label = devm_kstrdup(dev, client->name, GFP_KERNEL);
1149 pctl->gpio.base = -1;
1150 pctl->gpio.ngpio = pctl->data->npins;
1151 pctl->gpio.get_direction = sx150x_gpio_get_direction;
1152 pctl->gpio.direction_input = sx150x_gpio_direction_input;
1153 pctl->gpio.direction_output = sx150x_gpio_direction_output;
1154 pctl->gpio.get = sx150x_gpio_get;
1155 pctl->gpio.set = sx150x_gpio_set;
1156 pctl->gpio.set_config = gpiochip_generic_config;
1157 pctl->gpio.parent = dev;
1158 #ifdef CONFIG_OF_GPIO
1159 pctl->gpio.of_node = dev->of_node;
1160 #endif
1161 pctl->gpio.can_sleep = true;
1162 /*
1163 * Setting multiple pins is not safe when all pins are not
1164 * handled by the same regmap register. The oscio pin (present
1165 * on the SX150X_789 chips) lives in its own register, so
1166 * would require locking that is not in place at this time.
1167 */
1168 if (pctl->data->model != SX150X_789)
1169 pctl->gpio.set_multiple = sx150x_gpio_set_multiple;
1170
1171 ret = devm_gpiochip_add_data(dev, &pctl->gpio, pctl);
1172 if (ret)
1173 return ret;
1174
1175 /* Add Interrupt support if an irq is specified */
1176 if (client->irq > 0) {
1177 pctl->irq_chip.name = devm_kstrdup(dev, client->name,
1178 GFP_KERNEL);
1179 pctl->irq_chip.irq_mask = sx150x_irq_mask;
1180 pctl->irq_chip.irq_unmask = sx150x_irq_unmask;
1181 pctl->irq_chip.irq_set_type = sx150x_irq_set_type;
1182 pctl->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
1183 pctl->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
1184
1185 pctl->irq.masked = ~0;
1186 pctl->irq.sense = 0;
1187
1188 /*
1189 * Because sx150x_irq_threaded_fn invokes all of the
1190 * nested interrrupt handlers via handle_nested_irq,
1191 * any "handler" passed to gpiochip_irqchip_add()
1192 * below is going to be ignored, so the choice of the
1193 * function does not matter that much.
1194 *
1195 * We set it to handle_bad_irq to avoid confusion,
1196 * plus it will be instantly noticeable if it is ever
1197 * called (should not happen)
1198 */
1199 ret = gpiochip_irqchip_add_nested(&pctl->gpio,
1200 &pctl->irq_chip, 0,
1201 handle_bad_irq, IRQ_TYPE_NONE);
1202 if (ret) {
1203 dev_err(dev, "could not connect irqchip to gpiochip\n");
1204 return ret;
1205 }
1206
1207 ret = devm_request_threaded_irq(dev, client->irq, NULL,
1208 sx150x_irq_thread_fn,
1209 IRQF_ONESHOT | IRQF_SHARED |
1210 IRQF_TRIGGER_FALLING,
1211 pctl->irq_chip.name, pctl);
1212 if (ret < 0)
1213 return ret;
1214
1215 gpiochip_set_nested_irqchip(&pctl->gpio,
1216 &pctl->irq_chip,
1217 client->irq);
1218 }
1219
1220 /* Pinctrl_desc */
1221 pctl->pinctrl_desc.name = "sx150x-pinctrl";
1222 pctl->pinctrl_desc.pctlops = &sx150x_pinctrl_ops;
1223 pctl->pinctrl_desc.confops = &sx150x_pinconf_ops;
1224 pctl->pinctrl_desc.pins = pctl->data->pins;
1225 pctl->pinctrl_desc.npins = pctl->data->npins;
1226 pctl->pinctrl_desc.owner = THIS_MODULE;
1227
1228 pctl->pctldev = pinctrl_register(&pctl->pinctrl_desc, dev, pctl);
1229 if (IS_ERR(pctl->pctldev)) {
1230 dev_err(dev, "Failed to register pinctrl device\n");
1231 return PTR_ERR(pctl->pctldev);
1232 }
1233
1234 return 0;
1235 }
1236
1237 static struct i2c_driver sx150x_driver = {
1238 .driver = {
1239 .name = "sx150x-pinctrl",
1240 .of_match_table = of_match_ptr(sx150x_of_match),
1241 },
1242 .probe = sx150x_probe,
1243 .id_table = sx150x_id,
1244 };
1245
1246 static int __init sx150x_init(void)
1247 {
1248 return i2c_add_driver(&sx150x_driver);
1249 }
1250 subsys_initcall(sx150x_init);
Linux with added FPC-III support