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[mirror_ubuntu-artful-kernel.git] / drivers / pinctrl / pinctrl-sx150x.c
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_single_ended(struct gpio_chip *chip,
428 unsigned int offset,
429 enum single_ended_mode mode)
430 {
431 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
432 int ret;
433
434 switch (mode) {
435 case LINE_MODE_PUSH_PULL:
436 if (pctl->data->model != SX150X_789 ||
437 sx150x_pin_is_oscio(pctl, offset))
438 return 0;
439
440 ret = regmap_write_bits(pctl->regmap,
441 pctl->data->pri.x789.reg_drain,
442 BIT(offset), 0);
443 break;
444
445 case LINE_MODE_OPEN_DRAIN:
446 if (pctl->data->model != SX150X_789 ||
447 sx150x_pin_is_oscio(pctl, offset))
448 return -ENOTSUPP;
449
450 ret = regmap_write_bits(pctl->regmap,
451 pctl->data->pri.x789.reg_drain,
452 BIT(offset), BIT(offset));
453 break;
454 default:
455 ret = -ENOTSUPP;
456 break;
457 }
458
459 return ret;
460 }
461
462 static int __sx150x_gpio_set(struct sx150x_pinctrl *pctl, unsigned int offset,
463 int value)
464 {
465 return regmap_write_bits(pctl->regmap, pctl->data->reg_data,
466 BIT(offset), value ? BIT(offset) : 0);
467 }
468
469 static int sx150x_gpio_oscio_set(struct sx150x_pinctrl *pctl,
470 int value)
471 {
472 return regmap_write(pctl->regmap,
473 pctl->data->pri.x789.reg_clock,
474 (value ? 0x1f : 0x10));
475 }
476
477 static void sx150x_gpio_set(struct gpio_chip *chip, unsigned int offset,
478 int value)
479 {
480 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
481
482 if (sx150x_pin_is_oscio(pctl, offset))
483 sx150x_gpio_oscio_set(pctl, value);
484 else
485 __sx150x_gpio_set(pctl, offset, value);
486
487 }
488
489 static void sx150x_gpio_set_multiple(struct gpio_chip *chip,
490 unsigned long *mask,
491 unsigned long *bits)
492 {
493 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
494
495 regmap_write_bits(pctl->regmap, pctl->data->reg_data, *mask, *bits);
496 }
497
498 static int sx150x_gpio_direction_input(struct gpio_chip *chip,
499 unsigned int offset)
500 {
501 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
502
503 if (sx150x_pin_is_oscio(pctl, offset))
504 return -EINVAL;
505
506 return regmap_write_bits(pctl->regmap,
507 pctl->data->reg_dir,
508 BIT(offset), BIT(offset));
509 }
510
511 static int sx150x_gpio_direction_output(struct gpio_chip *chip,
512 unsigned int offset, int value)
513 {
514 struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
515 int ret;
516
517 if (sx150x_pin_is_oscio(pctl, offset))
518 return sx150x_gpio_oscio_set(pctl, value);
519
520 ret = __sx150x_gpio_set(pctl, offset, value);
521 if (ret < 0)
522 return ret;
523
524 return regmap_write_bits(pctl->regmap,
525 pctl->data->reg_dir,
526 BIT(offset), 0);
527 }
528
529 static void sx150x_irq_mask(struct irq_data *d)
530 {
531 struct sx150x_pinctrl *pctl =
532 gpiochip_get_data(irq_data_get_irq_chip_data(d));
533 unsigned int n = d->hwirq;
534
535 pctl->irq.masked |= BIT(n);
536 }
537
538 static void sx150x_irq_unmask(struct irq_data *d)
539 {
540 struct sx150x_pinctrl *pctl =
541 gpiochip_get_data(irq_data_get_irq_chip_data(d));
542 unsigned int n = d->hwirq;
543
544 pctl->irq.masked &= ~BIT(n);
545 }
546
547 static void sx150x_irq_set_sense(struct sx150x_pinctrl *pctl,
548 unsigned int line, unsigned int sense)
549 {
550 /*
551 * Every interrupt line is represented by two bits shifted
552 * proportionally to the line number
553 */
554 const unsigned int n = line * 2;
555 const unsigned int mask = ~((SX150X_IRQ_TYPE_EDGE_RISING |
556 SX150X_IRQ_TYPE_EDGE_FALLING) << n);
557
558 pctl->irq.sense &= mask;
559 pctl->irq.sense |= sense << n;
560 }
561
562 static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
563 {
564 struct sx150x_pinctrl *pctl =
565 gpiochip_get_data(irq_data_get_irq_chip_data(d));
566 unsigned int n, val = 0;
567
568 if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
569 return -EINVAL;
570
571 n = d->hwirq;
572
573 if (flow_type & IRQ_TYPE_EDGE_RISING)
574 val |= SX150X_IRQ_TYPE_EDGE_RISING;
575 if (flow_type & IRQ_TYPE_EDGE_FALLING)
576 val |= SX150X_IRQ_TYPE_EDGE_FALLING;
577
578 sx150x_irq_set_sense(pctl, n, val);
579 return 0;
580 }
581
582 static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
583 {
584 struct sx150x_pinctrl *pctl = (struct sx150x_pinctrl *)dev_id;
585 unsigned long n, status;
586 unsigned int val;
587 int err;
588
589 err = regmap_read(pctl->regmap, pctl->data->reg_irq_src, &val);
590 if (err < 0)
591 return IRQ_NONE;
592
593 err = regmap_write(pctl->regmap, pctl->data->reg_irq_src, val);
594 if (err < 0)
595 return IRQ_NONE;
596
597 status = val;
598 for_each_set_bit(n, &status, pctl->data->ngpios)
599 handle_nested_irq(irq_find_mapping(pctl->gpio.irqdomain, n));
600
601 return IRQ_HANDLED;
602 }
603
604 static void sx150x_irq_bus_lock(struct irq_data *d)
605 {
606 struct sx150x_pinctrl *pctl =
607 gpiochip_get_data(irq_data_get_irq_chip_data(d));
608
609 mutex_lock(&pctl->lock);
610 }
611
612 static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
613 {
614 struct sx150x_pinctrl *pctl =
615 gpiochip_get_data(irq_data_get_irq_chip_data(d));
616
617 regmap_write(pctl->regmap, pctl->data->reg_irq_mask, pctl->irq.masked);
618 regmap_write(pctl->regmap, pctl->data->reg_sense, pctl->irq.sense);
619 mutex_unlock(&pctl->lock);
620 }
621
622 static int sx150x_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
623 unsigned long *config)
624 {
625 struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
626 unsigned int param = pinconf_to_config_param(*config);
627 int ret;
628 u32 arg;
629 unsigned int data;
630
631 if (sx150x_pin_is_oscio(pctl, pin)) {
632 switch (param) {
633 case PIN_CONFIG_DRIVE_PUSH_PULL:
634 case PIN_CONFIG_OUTPUT:
635 ret = regmap_read(pctl->regmap,
636 pctl->data->pri.x789.reg_clock,
637 &data);
638 if (ret < 0)
639 return ret;
640
641 if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
642 arg = (data & 0x1f) ? 1 : 0;
643 else {
644 if ((data & 0x1f) == 0x1f)
645 arg = 1;
646 else if ((data & 0x1f) == 0x10)
647 arg = 0;
648 else
649 return -EINVAL;
650 }
651
652 break;
653 default:
654 return -ENOTSUPP;
655 }
656
657 goto out;
658 }
659
660 switch (param) {
661 case PIN_CONFIG_BIAS_PULL_DOWN:
662 ret = regmap_read(pctl->regmap,
663 pctl->data->reg_pulldn,
664 &data);
665 data &= BIT(pin);
666
667 if (ret < 0)
668 return ret;
669
670 if (!ret)
671 return -EINVAL;
672
673 arg = 1;
674 break;
675
676 case PIN_CONFIG_BIAS_PULL_UP:
677 ret = regmap_read(pctl->regmap,
678 pctl->data->reg_pullup,
679 &data);
680 data &= BIT(pin);
681
682 if (ret < 0)
683 return ret;
684
685 if (!ret)
686 return -EINVAL;
687
688 arg = 1;
689 break;
690
691 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
692 if (pctl->data->model != SX150X_789)
693 return -ENOTSUPP;
694
695 ret = regmap_read(pctl->regmap,
696 pctl->data->pri.x789.reg_drain,
697 &data);
698 data &= BIT(pin);
699
700 if (ret < 0)
701 return ret;
702
703 if (!data)
704 return -EINVAL;
705
706 arg = 1;
707 break;
708
709 case PIN_CONFIG_DRIVE_PUSH_PULL:
710 if (pctl->data->model != SX150X_789)
711 arg = true;
712 else {
713 ret = regmap_read(pctl->regmap,
714 pctl->data->pri.x789.reg_drain,
715 &data);
716 data &= BIT(pin);
717
718 if (ret < 0)
719 return ret;
720
721 if (data)
722 return -EINVAL;
723
724 arg = 1;
725 }
726 break;
727
728 case PIN_CONFIG_OUTPUT:
729 ret = sx150x_gpio_get_direction(&pctl->gpio, pin);
730 if (ret < 0)
731 return ret;
732
733 if (ret)
734 return -EINVAL;
735
736 ret = sx150x_gpio_get(&pctl->gpio, pin);
737 if (ret < 0)
738 return ret;
739
740 arg = ret;
741 break;
742
743 default:
744 return -ENOTSUPP;
745 }
746
747 out:
748 *config = pinconf_to_config_packed(param, arg);
749
750 return 0;
751 }
752
753 static int sx150x_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
754 unsigned long *configs, unsigned int num_configs)
755 {
756 struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
757 enum pin_config_param param;
758 u32 arg;
759 int i;
760 int ret;
761
762 for (i = 0; i < num_configs; i++) {
763 param = pinconf_to_config_param(configs[i]);
764 arg = pinconf_to_config_argument(configs[i]);
765
766 if (sx150x_pin_is_oscio(pctl, pin)) {
767 if (param == PIN_CONFIG_OUTPUT) {
768 ret = sx150x_gpio_direction_output(&pctl->gpio,
769 pin, arg);
770 if (ret < 0)
771 return ret;
772
773 continue;
774 } else
775 return -ENOTSUPP;
776 }
777
778 switch (param) {
779 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
780 case PIN_CONFIG_BIAS_DISABLE:
781 ret = regmap_write_bits(pctl->regmap,
782 pctl->data->reg_pulldn,
783 BIT(pin), 0);
784 if (ret < 0)
785 return ret;
786
787 ret = regmap_write_bits(pctl->regmap,
788 pctl->data->reg_pullup,
789 BIT(pin), 0);
790 if (ret < 0)
791 return ret;
792
793 break;
794
795 case PIN_CONFIG_BIAS_PULL_UP:
796 ret = regmap_write_bits(pctl->regmap,
797 pctl->data->reg_pullup,
798 BIT(pin), BIT(pin));
799 if (ret < 0)
800 return ret;
801
802 break;
803
804 case PIN_CONFIG_BIAS_PULL_DOWN:
805 ret = regmap_write_bits(pctl->regmap,
806 pctl->data->reg_pulldn,
807 BIT(pin), BIT(pin));
808 if (ret < 0)
809 return ret;
810
811 break;
812
813 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
814 ret = sx150x_gpio_set_single_ended(&pctl->gpio,
815 pin, LINE_MODE_OPEN_DRAIN);
816 if (ret < 0)
817 return ret;
818
819 break;
820
821 case PIN_CONFIG_DRIVE_PUSH_PULL:
822 ret = sx150x_gpio_set_single_ended(&pctl->gpio,
823 pin, LINE_MODE_PUSH_PULL);
824 if (ret < 0)
825 return ret;
826
827 break;
828
829 case PIN_CONFIG_OUTPUT:
830 ret = sx150x_gpio_direction_output(&pctl->gpio,
831 pin, arg);
832 if (ret < 0)
833 return ret;
834
835 break;
836
837 default:
838 return -ENOTSUPP;
839 }
840 } /* for each config */
841
842 return 0;
843 }
844
845 static const struct pinconf_ops sx150x_pinconf_ops = {
846 .pin_config_get = sx150x_pinconf_get,
847 .pin_config_set = sx150x_pinconf_set,
848 .is_generic = true,
849 };
850
851 static const struct i2c_device_id sx150x_id[] = {
852 {"sx1501q", (kernel_ulong_t) &sx1501q_device_data },
853 {"sx1502q", (kernel_ulong_t) &sx1502q_device_data },
854 {"sx1503q", (kernel_ulong_t) &sx1503q_device_data },
855 {"sx1504q", (kernel_ulong_t) &sx1504q_device_data },
856 {"sx1505q", (kernel_ulong_t) &sx1505q_device_data },
857 {"sx1506q", (kernel_ulong_t) &sx1506q_device_data },
858 {"sx1507q", (kernel_ulong_t) &sx1507q_device_data },
859 {"sx1508q", (kernel_ulong_t) &sx1508q_device_data },
860 {"sx1509q", (kernel_ulong_t) &sx1509q_device_data },
861 {}
862 };
863
864 static const struct of_device_id sx150x_of_match[] = {
865 { .compatible = "semtech,sx1501q", .data = &sx1501q_device_data },
866 { .compatible = "semtech,sx1502q", .data = &sx1502q_device_data },
867 { .compatible = "semtech,sx1503q", .data = &sx1503q_device_data },
868 { .compatible = "semtech,sx1504q", .data = &sx1504q_device_data },
869 { .compatible = "semtech,sx1505q", .data = &sx1505q_device_data },
870 { .compatible = "semtech,sx1506q", .data = &sx1506q_device_data },
871 { .compatible = "semtech,sx1507q", .data = &sx1507q_device_data },
872 { .compatible = "semtech,sx1508q", .data = &sx1508q_device_data },
873 { .compatible = "semtech,sx1509q", .data = &sx1509q_device_data },
874 {},
875 };
876
877 static int sx150x_reset(struct sx150x_pinctrl *pctl)
878 {
879 int err;
880
881 err = i2c_smbus_write_byte_data(pctl->client,
882 pctl->data->pri.x789.reg_reset,
883 SX150X_789_RESET_KEY1);
884 if (err < 0)
885 return err;
886
887 err = i2c_smbus_write_byte_data(pctl->client,
888 pctl->data->pri.x789.reg_reset,
889 SX150X_789_RESET_KEY2);
890 return err;
891 }
892
893 static int sx150x_init_misc(struct sx150x_pinctrl *pctl)
894 {
895 u8 reg, value;
896
897 switch (pctl->data->model) {
898 case SX150X_789:
899 reg = pctl->data->pri.x789.reg_misc;
900 value = SX150X_789_REG_MISC_AUTOCLEAR_OFF;
901 break;
902 case SX150X_456:
903 reg = pctl->data->pri.x456.reg_advanced;
904 value = 0x00;
905
906 /*
907 * Only SX1506 has RegAdvanced, SX1504/5 are expected
908 * to initialize this offset to zero
909 */
910 if (!reg)
911 return 0;
912 break;
913 case SX150X_123:
914 reg = pctl->data->pri.x123.reg_advanced;
915 value = 0x00;
916 break;
917 default:
918 WARN(1, "Unknown chip model %d\n", pctl->data->model);
919 return -EINVAL;
920 }
921
922 return regmap_write(pctl->regmap, reg, value);
923 }
924
925 static int sx150x_init_hw(struct sx150x_pinctrl *pctl)
926 {
927 const u8 reg[] = {
928 [SX150X_789] = pctl->data->pri.x789.reg_polarity,
929 [SX150X_456] = pctl->data->pri.x456.reg_pld_mode,
930 [SX150X_123] = pctl->data->pri.x123.reg_pld_mode,
931 };
932 int err;
933
934 if (pctl->data->model == SX150X_789 &&
935 of_property_read_bool(pctl->dev->of_node, "semtech,probe-reset")) {
936 err = sx150x_reset(pctl);
937 if (err < 0)
938 return err;
939 }
940
941 err = sx150x_init_misc(pctl);
942 if (err < 0)
943 return err;
944
945 /* Set all pins to work in normal mode */
946 return regmap_write(pctl->regmap, reg[pctl->data->model], 0);
947 }
948
949 static int sx150x_regmap_reg_width(struct sx150x_pinctrl *pctl,
950 unsigned int reg)
951 {
952 const struct sx150x_device_data *data = pctl->data;
953
954 if (reg == data->reg_sense) {
955 /*
956 * RegSense packs two bits of configuration per GPIO,
957 * so we'd need to read twice as many bits as there
958 * are GPIO in our chip
959 */
960 return 2 * data->ngpios;
961 } else if ((data->model == SX150X_789 &&
962 (reg == data->pri.x789.reg_misc ||
963 reg == data->pri.x789.reg_clock ||
964 reg == data->pri.x789.reg_reset))
965 ||
966 (data->model == SX150X_123 &&
967 reg == data->pri.x123.reg_advanced)
968 ||
969 (data->model == SX150X_456 &&
970 data->pri.x456.reg_advanced &&
971 reg == data->pri.x456.reg_advanced)) {
972 return 8;
973 } else {
974 return data->ngpios;
975 }
976 }
977
978 static unsigned int sx150x_maybe_swizzle(struct sx150x_pinctrl *pctl,
979 unsigned int reg, unsigned int val)
980 {
981 unsigned int a, b;
982 const struct sx150x_device_data *data = pctl->data;
983
984 /*
985 * Whereas SX1509 presents RegSense in a simple layout as such:
986 * reg [ f f e e d d c c ]
987 * reg + 1 [ b b a a 9 9 8 8 ]
988 * reg + 2 [ 7 7 6 6 5 5 4 4 ]
989 * reg + 3 [ 3 3 2 2 1 1 0 0 ]
990 *
991 * SX1503 and SX1506 deviate from that data layout, instead storing
992 * their contents as follows:
993 *
994 * reg [ f f e e d d c c ]
995 * reg + 1 [ 7 7 6 6 5 5 4 4 ]
996 * reg + 2 [ b b a a 9 9 8 8 ]
997 * reg + 3 [ 3 3 2 2 1 1 0 0 ]
998 *
999 * so, taking that into account, we swap two
1000 * inner bytes of a 4-byte result
1001 */
1002
1003 if (reg == data->reg_sense &&
1004 data->ngpios == 16 &&
1005 (data->model == SX150X_123 ||
1006 data->model == SX150X_456)) {
1007 a = val & 0x00ff0000;
1008 b = val & 0x0000ff00;
1009
1010 val &= 0xff0000ff;
1011 val |= b << 8;
1012 val |= a >> 8;
1013 }
1014
1015 return val;
1016 }
1017
1018 /*
1019 * In order to mask the differences between 16 and 8 bit expander
1020 * devices we set up a sligthly ficticious regmap that pretends to be
1021 * a set of 32-bit (to accomodate RegSenseLow/RegSenseHigh
1022 * pair/quartet) registers and transparently reconstructs those
1023 * registers via multiple I2C/SMBus reads
1024 *
1025 * This way the rest of the driver code, interfacing with the chip via
1026 * regmap API, can work assuming that each GPIO pin is represented by
1027 * a group of bits at an offset proportional to GPIO number within a
1028 * given register.
1029 */
1030 static int sx150x_regmap_reg_read(void *context, unsigned int reg,
1031 unsigned int *result)
1032 {
1033 int ret, n;
1034 struct sx150x_pinctrl *pctl = context;
1035 struct i2c_client *i2c = pctl->client;
1036 const int width = sx150x_regmap_reg_width(pctl, reg);
1037 unsigned int idx, val;
1038
1039 /*
1040 * There are four potential cases covered by this function:
1041 *
1042 * 1) 8-pin chip, single configuration bit register
1043 *
1044 * This is trivial the code below just needs to read:
1045 * reg [ 7 6 5 4 3 2 1 0 ]
1046 *
1047 * 2) 8-pin chip, double configuration bit register (RegSense)
1048 *
1049 * The read will be done as follows:
1050 * reg [ 7 7 6 6 5 5 4 4 ]
1051 * reg + 1 [ 3 3 2 2 1 1 0 0 ]
1052 *
1053 * 3) 16-pin chip, single configuration bit register
1054 *
1055 * The read will be done as follows:
1056 * reg [ f e d c b a 9 8 ]
1057 * reg + 1 [ 7 6 5 4 3 2 1 0 ]
1058 *
1059 * 4) 16-pin chip, double configuration bit register (RegSense)
1060 *
1061 * The read will be done as follows:
1062 * reg [ f f e e d d c c ]
1063 * reg + 1 [ b b a a 9 9 8 8 ]
1064 * reg + 2 [ 7 7 6 6 5 5 4 4 ]
1065 * reg + 3 [ 3 3 2 2 1 1 0 0 ]
1066 */
1067
1068 for (n = width, val = 0, idx = reg; n > 0; n -= 8, idx++) {
1069 val <<= 8;
1070
1071 ret = i2c_smbus_read_byte_data(i2c, idx);
1072 if (ret < 0)
1073 return ret;
1074
1075 val |= ret;
1076 }
1077
1078 *result = sx150x_maybe_swizzle(pctl, reg, val);
1079
1080 return 0;
1081 }
1082
1083 static int sx150x_regmap_reg_write(void *context, unsigned int reg,
1084 unsigned int val)
1085 {
1086 int ret, n;
1087 struct sx150x_pinctrl *pctl = context;
1088 struct i2c_client *i2c = pctl->client;
1089 const int width = sx150x_regmap_reg_width(pctl, reg);
1090
1091 val = sx150x_maybe_swizzle(pctl, reg, val);
1092
1093 n = (width - 1) & ~7;
1094 do {
1095 const u8 byte = (val >> n) & 0xff;
1096
1097 ret = i2c_smbus_write_byte_data(i2c, reg, byte);
1098 if (ret < 0)
1099 return ret;
1100
1101 reg++;
1102 n -= 8;
1103 } while (n >= 0);
1104
1105 return 0;
1106 }
1107
1108 static bool sx150x_reg_volatile(struct device *dev, unsigned int reg)
1109 {
1110 struct sx150x_pinctrl *pctl = i2c_get_clientdata(to_i2c_client(dev));
1111
1112 return reg == pctl->data->reg_irq_src || reg == pctl->data->reg_data;
1113 }
1114
1115 const struct regmap_config sx150x_regmap_config = {
1116 .reg_bits = 8,
1117 .val_bits = 32,
1118
1119 .cache_type = REGCACHE_RBTREE,
1120
1121 .reg_read = sx150x_regmap_reg_read,
1122 .reg_write = sx150x_regmap_reg_write,
1123
1124 .max_register = SX150X_MAX_REGISTER,
1125 .volatile_reg = sx150x_reg_volatile,
1126 };
1127
1128 static int sx150x_probe(struct i2c_client *client,
1129 const struct i2c_device_id *id)
1130 {
1131 static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
1132 I2C_FUNC_SMBUS_WRITE_WORD_DATA;
1133 struct device *dev = &client->dev;
1134 struct sx150x_pinctrl *pctl;
1135 int ret;
1136
1137 if (!i2c_check_functionality(client->adapter, i2c_funcs))
1138 return -ENOSYS;
1139
1140 pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
1141 if (!pctl)
1142 return -ENOMEM;
1143
1144 i2c_set_clientdata(client, pctl);
1145
1146 pctl->dev = dev;
1147 pctl->client = client;
1148
1149 if (dev->of_node)
1150 pctl->data = of_device_get_match_data(dev);
1151 else
1152 pctl->data = (struct sx150x_device_data *)id->driver_data;
1153
1154 if (!pctl->data)
1155 return -EINVAL;
1156
1157 pctl->regmap = devm_regmap_init(dev, NULL, pctl,
1158 &sx150x_regmap_config);
1159 if (IS_ERR(pctl->regmap)) {
1160 ret = PTR_ERR(pctl->regmap);
1161 dev_err(dev, "Failed to allocate register map: %d\n",
1162 ret);
1163 return ret;
1164 }
1165
1166 mutex_init(&pctl->lock);
1167
1168 ret = sx150x_init_hw(pctl);
1169 if (ret)
1170 return ret;
1171
1172 /* Register GPIO controller */
1173 pctl->gpio.label = devm_kstrdup(dev, client->name, GFP_KERNEL);
1174 pctl->gpio.base = -1;
1175 pctl->gpio.ngpio = pctl->data->npins;
1176 pctl->gpio.get_direction = sx150x_gpio_get_direction;
1177 pctl->gpio.direction_input = sx150x_gpio_direction_input;
1178 pctl->gpio.direction_output = sx150x_gpio_direction_output;
1179 pctl->gpio.get = sx150x_gpio_get;
1180 pctl->gpio.set = sx150x_gpio_set;
1181 pctl->gpio.set_single_ended = sx150x_gpio_set_single_ended;
1182 pctl->gpio.parent = dev;
1183 #ifdef CONFIG_OF_GPIO
1184 pctl->gpio.of_node = dev->of_node;
1185 #endif
1186 pctl->gpio.can_sleep = true;
1187 /*
1188 * Setting multiple pins is not safe when all pins are not
1189 * handled by the same regmap register. The oscio pin (present
1190 * on the SX150X_789 chips) lives in its own register, so
1191 * would require locking that is not in place at this time.
1192 */
1193 if (pctl->data->model != SX150X_789)
1194 pctl->gpio.set_multiple = sx150x_gpio_set_multiple;
1195
1196 ret = devm_gpiochip_add_data(dev, &pctl->gpio, pctl);
1197 if (ret)
1198 return ret;
1199
1200 /* Add Interrupt support if an irq is specified */
1201 if (client->irq > 0) {
1202 pctl->irq_chip.name = devm_kstrdup(dev, client->name,
1203 GFP_KERNEL);
1204 pctl->irq_chip.irq_mask = sx150x_irq_mask;
1205 pctl->irq_chip.irq_unmask = sx150x_irq_unmask;
1206 pctl->irq_chip.irq_set_type = sx150x_irq_set_type;
1207 pctl->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
1208 pctl->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
1209
1210 pctl->irq.masked = ~0;
1211 pctl->irq.sense = 0;
1212
1213 /*
1214 * Because sx150x_irq_threaded_fn invokes all of the
1215 * nested interrrupt handlers via handle_nested_irq,
1216 * any "handler" passed to gpiochip_irqchip_add()
1217 * below is going to be ignored, so the choice of the
1218 * function does not matter that much.
1219 *
1220 * We set it to handle_bad_irq to avoid confusion,
1221 * plus it will be instantly noticeable if it is ever
1222 * called (should not happen)
1223 */
1224 ret = gpiochip_irqchip_add_nested(&pctl->gpio,
1225 &pctl->irq_chip, 0,
1226 handle_bad_irq, IRQ_TYPE_NONE);
1227 if (ret) {
1228 dev_err(dev, "could not connect irqchip to gpiochip\n");
1229 return ret;
1230 }
1231
1232 ret = devm_request_threaded_irq(dev, client->irq, NULL,
1233 sx150x_irq_thread_fn,
1234 IRQF_ONESHOT | IRQF_SHARED |
1235 IRQF_TRIGGER_FALLING,
1236 pctl->irq_chip.name, pctl);
1237 if (ret < 0)
1238 return ret;
1239
1240 gpiochip_set_nested_irqchip(&pctl->gpio,
1241 &pctl->irq_chip,
1242 client->irq);
1243 }
1244
1245 /* Pinctrl_desc */
1246 pctl->pinctrl_desc.name = "sx150x-pinctrl";
1247 pctl->pinctrl_desc.pctlops = &sx150x_pinctrl_ops;
1248 pctl->pinctrl_desc.confops = &sx150x_pinconf_ops;
1249 pctl->pinctrl_desc.pins = pctl->data->pins;
1250 pctl->pinctrl_desc.npins = pctl->data->npins;
1251 pctl->pinctrl_desc.owner = THIS_MODULE;
1252
1253 pctl->pctldev = pinctrl_register(&pctl->pinctrl_desc, dev, pctl);
1254 if (IS_ERR(pctl->pctldev)) {
1255 dev_err(dev, "Failed to register pinctrl device\n");
1256 return PTR_ERR(pctl->pctldev);
1257 }
1258
1259 return 0;
1260 }
1261
1262 static struct i2c_driver sx150x_driver = {
1263 .driver = {
1264 .name = "sx150x-pinctrl",
1265 .of_match_table = of_match_ptr(sx150x_of_match),
1266 },
1267 .probe = sx150x_probe,
1268 .id_table = sx150x_id,
1269 };
1270
1271 static int __init sx150x_init(void)
1272 {
1273 return i2c_add_driver(&sx150x_driver);
1274 }
1275 subsys_initcall(sx150x_init);
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