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Gregory Beanc34f16b2010-08-10 18:02:27 -07001/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
2 *
Paul Gortmaker24a876c2016-04-01 14:49:35 -04003 * Driver for Semtech SX150X I2C GPIO Expanders
4 *
5 * Author: Gregory Bean <gbean@codeaurora.org>
6 *
Gregory Beanc34f16b2010-08-10 18:02:27 -07007 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 and
9 * only version 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 * 02110-1301, USA.
20 */
21#include <linux/gpio.h>
22#include <linux/i2c.h>
23#include <linux/init.h>
24#include <linux/interrupt.h>
25#include <linux/irq.h>
Gregory Beanc34f16b2010-08-10 18:02:27 -070026#include <linux/mutex.h>
27#include <linux/slab.h>
Wei Chen04d22642015-01-15 08:16:10 +080028#include <linux/of.h>
29#include <linux/of_address.h>
30#include <linux/of_irq.h>
31#include <linux/of_gpio.h>
32#include <linux/of_device.h>
Gregory Beanc34f16b2010-08-10 18:02:27 -070033
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +010034#define NO_UPDATE_PENDING -1
35
Wei Chenae9ca492014-12-04 20:12:09 +080036/* The chip models of sx150x */
Peter Rosin50e8df02015-12-15 23:01:34 +010037#define SX150X_123 0
38#define SX150X_456 1
39#define SX150X_789 2
40
41struct sx150x_123_pri {
42 u8 reg_pld_mode;
43 u8 reg_pld_table0;
44 u8 reg_pld_table1;
45 u8 reg_pld_table2;
46 u8 reg_pld_table3;
47 u8 reg_pld_table4;
48 u8 reg_advance;
49};
Wei Chenae9ca492014-12-04 20:12:09 +080050
51struct sx150x_456_pri {
52 u8 reg_pld_mode;
53 u8 reg_pld_table0;
54 u8 reg_pld_table1;
55 u8 reg_pld_table2;
56 u8 reg_pld_table3;
57 u8 reg_pld_table4;
58 u8 reg_advance;
59};
60
61struct sx150x_789_pri {
Gregory Beanc34f16b2010-08-10 18:02:27 -070062 u8 reg_drain;
63 u8 reg_polarity;
Wei Chenae9ca492014-12-04 20:12:09 +080064 u8 reg_clock;
65 u8 reg_misc;
66 u8 reg_reset;
67 u8 ngpios;
68};
69
70struct sx150x_device_data {
71 u8 model;
72 u8 reg_pullup;
73 u8 reg_pulldn;
Gregory Beanc34f16b2010-08-10 18:02:27 -070074 u8 reg_dir;
75 u8 reg_data;
76 u8 reg_irq_mask;
77 u8 reg_irq_src;
78 u8 reg_sense;
Gregory Beanc34f16b2010-08-10 18:02:27 -070079 u8 ngpios;
Wei Chenae9ca492014-12-04 20:12:09 +080080 union {
Peter Rosin50e8df02015-12-15 23:01:34 +010081 struct sx150x_123_pri x123;
Wei Chenae9ca492014-12-04 20:12:09 +080082 struct sx150x_456_pri x456;
83 struct sx150x_789_pri x789;
84 } pri;
Gregory Beanc34f16b2010-08-10 18:02:27 -070085};
86
Linus Walleijd17322f2016-04-09 10:52:26 +020087/**
88 * struct sx150x_platform_data - config data for SX150x driver
89 * @gpio_base: The index number of the first GPIO assigned to this
90 * GPIO expander. The expander will create a block of
91 * consecutively numbered gpios beginning at the given base,
92 * with the size of the block depending on the model of the
93 * expander chip.
94 * @oscio_is_gpo: If set to true, the driver will configure OSCIO as a GPO
95 * instead of as an oscillator, increasing the size of the
96 * GP(I)O pool created by this expander by one. The
97 * output-only GPO pin will be added at the end of the block.
98 * @io_pullup_ena: A bit-mask which enables or disables the pull-up resistor
99 * for each IO line in the expander. Setting the bit at
100 * position n will enable the pull-up for the IO at
101 * the corresponding offset. For chips with fewer than
102 * 16 IO pins, high-end bits are ignored.
103 * @io_pulldn_ena: A bit-mask which enables-or disables the pull-down
104 * resistor for each IO line in the expander. Setting the
105 * bit at position n will enable the pull-down for the IO at
106 * the corresponding offset. For chips with fewer than
107 * 16 IO pins, high-end bits are ignored.
Linus Walleijd17322f2016-04-09 10:52:26 +0200108 * @io_polarity: A bit-mask which enables polarity inversion for each IO line
109 * in the expander. Setting the bit at position n inverts
110 * the polarity of that IO line, while clearing it results
111 * in normal polarity. For chips with fewer than 16 IO pins,
112 * high-end bits are ignored.
113 * @irq_summary: The 'summary IRQ' line to which the GPIO expander's INT line
114 * is connected, via which it reports interrupt events
115 * across all GPIO lines. This must be a real,
116 * pre-existing IRQ line.
117 * Setting this value < 0 disables the irq_chip functionality
118 * of the driver.
119 * @irq_base: The first 'virtual IRQ' line at which our block of GPIO-based
120 * IRQ lines will appear. Similarly to gpio_base, the expander
121 * will create a block of irqs beginning at this number.
122 * This value is ignored if irq_summary is < 0.
123 * @reset_during_probe: If set to true, the driver will trigger a full
124 * reset of the chip at the beginning of the probe
125 * in order to place it in a known state.
126 */
127struct sx150x_platform_data {
128 unsigned gpio_base;
129 bool oscio_is_gpo;
130 u16 io_pullup_ena;
131 u16 io_pulldn_ena;
Linus Walleijd17322f2016-04-09 10:52:26 +0200132 u16 io_polarity;
133 int irq_summary;
134 unsigned irq_base;
135 bool reset_during_probe;
136};
137
Gregory Beanc34f16b2010-08-10 18:02:27 -0700138struct sx150x_chip {
139 struct gpio_chip gpio_chip;
140 struct i2c_client *client;
141 const struct sx150x_device_data *dev_cfg;
142 int irq_summary;
143 int irq_base;
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100144 int irq_update;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700145 u32 irq_sense;
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100146 u32 irq_masked;
147 u32 dev_sense;
148 u32 dev_masked;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700149 struct irq_chip irq_chip;
150 struct mutex lock;
151};
152
153static const struct sx150x_device_data sx150x_devices[] = {
154 [0] = { /* sx1508q */
Wei Chenae9ca492014-12-04 20:12:09 +0800155 .model = SX150X_789,
156 .reg_pullup = 0x03,
157 .reg_pulldn = 0x04,
158 .reg_dir = 0x07,
159 .reg_data = 0x08,
160 .reg_irq_mask = 0x09,
161 .reg_irq_src = 0x0c,
162 .reg_sense = 0x0b,
163 .pri.x789 = {
164 .reg_drain = 0x05,
165 .reg_polarity = 0x06,
166 .reg_clock = 0x0f,
167 .reg_misc = 0x10,
168 .reg_reset = 0x7d,
169 },
170 .ngpios = 8,
Gregory Beanc34f16b2010-08-10 18:02:27 -0700171 },
172 [1] = { /* sx1509q */
Wei Chenae9ca492014-12-04 20:12:09 +0800173 .model = SX150X_789,
174 .reg_pullup = 0x07,
175 .reg_pulldn = 0x09,
176 .reg_dir = 0x0f,
177 .reg_data = 0x11,
178 .reg_irq_mask = 0x13,
179 .reg_irq_src = 0x19,
180 .reg_sense = 0x17,
181 .pri.x789 = {
182 .reg_drain = 0x0b,
183 .reg_polarity = 0x0d,
184 .reg_clock = 0x1e,
185 .reg_misc = 0x1f,
186 .reg_reset = 0x7d,
187 },
188 .ngpios = 16
189 },
190 [2] = { /* sx1506q */
191 .model = SX150X_456,
192 .reg_pullup = 0x05,
193 .reg_pulldn = 0x07,
194 .reg_dir = 0x03,
195 .reg_data = 0x01,
196 .reg_irq_mask = 0x09,
197 .reg_irq_src = 0x0f,
198 .reg_sense = 0x0d,
199 .pri.x456 = {
200 .reg_pld_mode = 0x21,
201 .reg_pld_table0 = 0x23,
202 .reg_pld_table1 = 0x25,
203 .reg_pld_table2 = 0x27,
204 .reg_pld_table3 = 0x29,
205 .reg_pld_table4 = 0x2b,
206 .reg_advance = 0xad,
207 },
208 .ngpios = 16
Gregory Beanc34f16b2010-08-10 18:02:27 -0700209 },
Peter Rosin50e8df02015-12-15 23:01:34 +0100210 [3] = { /* sx1502q */
211 .model = SX150X_123,
212 .reg_pullup = 0x02,
213 .reg_pulldn = 0x03,
214 .reg_dir = 0x01,
215 .reg_data = 0x00,
216 .reg_irq_mask = 0x05,
217 .reg_irq_src = 0x08,
218 .reg_sense = 0x07,
219 .pri.x123 = {
220 .reg_pld_mode = 0x10,
221 .reg_pld_table0 = 0x11,
222 .reg_pld_table1 = 0x12,
223 .reg_pld_table2 = 0x13,
224 .reg_pld_table3 = 0x14,
225 .reg_pld_table4 = 0x15,
226 .reg_advance = 0xad,
227 },
228 .ngpios = 8,
229 },
Gregory Beanc34f16b2010-08-10 18:02:27 -0700230};
231
232static const struct i2c_device_id sx150x_id[] = {
233 {"sx1508q", 0},
234 {"sx1509q", 1},
Wei Chenae9ca492014-12-04 20:12:09 +0800235 {"sx1506q", 2},
Peter Rosin50e8df02015-12-15 23:01:34 +0100236 {"sx1502q", 3},
Gregory Beanc34f16b2010-08-10 18:02:27 -0700237 {}
238};
239MODULE_DEVICE_TABLE(i2c, sx150x_id);
240
Linus Walleij16858cc2015-01-22 09:45:24 +0100241static const struct of_device_id sx150x_of_match[] = {
Wei Chen04d22642015-01-15 08:16:10 +0800242 { .compatible = "semtech,sx1508q" },
243 { .compatible = "semtech,sx1509q" },
244 { .compatible = "semtech,sx1506q" },
Peter Rosin50e8df02015-12-15 23:01:34 +0100245 { .compatible = "semtech,sx1502q" },
Wei Chen04d22642015-01-15 08:16:10 +0800246 {},
247};
Linus Walleij16858cc2015-01-22 09:45:24 +0100248MODULE_DEVICE_TABLE(of, sx150x_of_match);
Wei Chen04d22642015-01-15 08:16:10 +0800249
Gregory Beanc34f16b2010-08-10 18:02:27 -0700250static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
251{
252 s32 err = i2c_smbus_write_byte_data(client, reg, val);
253
254 if (err < 0)
255 dev_warn(&client->dev,
256 "i2c write fail: can't write %02x to %02x: %d\n",
257 val, reg, err);
258 return err;
259}
260
261static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
262{
263 s32 err = i2c_smbus_read_byte_data(client, reg);
264
265 if (err >= 0)
266 *val = err;
267 else
268 dev_warn(&client->dev,
269 "i2c read fail: can't read from %02x: %d\n",
270 reg, err);
271 return err;
272}
273
274static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset)
275{
276 return (chip->dev_cfg->ngpios == offset);
277}
278
279/*
280 * These utility functions solve the common problem of locating and setting
281 * configuration bits. Configuration bits are grouped into registers
282 * whose indexes increase downwards. For example, with eight-bit registers,
283 * sixteen gpios would have their config bits grouped in the following order:
284 * REGISTER N-1 [ f e d c b a 9 8 ]
285 * N [ 7 6 5 4 3 2 1 0 ]
286 *
287 * For multi-bit configurations, the pattern gets wider:
288 * REGISTER N-3 [ f f e e d d c c ]
289 * N-2 [ b b a a 9 9 8 8 ]
290 * N-1 [ 7 7 6 6 5 5 4 4 ]
291 * N [ 3 3 2 2 1 1 0 0 ]
292 *
293 * Given the address of the starting register 'N', the index of the gpio
294 * whose configuration we seek to change, and the width in bits of that
295 * configuration, these functions allow us to locate the correct
296 * register and mask the correct bits.
297 */
298static inline void sx150x_find_cfg(u8 offset, u8 width,
299 u8 *reg, u8 *mask, u8 *shift)
300{
301 *reg -= offset * width / 8;
302 *mask = (1 << width) - 1;
303 *shift = (offset * width) % 8;
304 *mask <<= *shift;
305}
306
307static s32 sx150x_write_cfg(struct sx150x_chip *chip,
308 u8 offset, u8 width, u8 reg, u8 val)
309{
310 u8 mask;
311 u8 data;
312 u8 shift;
313 s32 err;
314
315 sx150x_find_cfg(offset, width, &reg, &mask, &shift);
316 err = sx150x_i2c_read(chip->client, reg, &data);
317 if (err < 0)
318 return err;
319
320 data &= ~mask;
321 data |= (val << shift) & mask;
322 return sx150x_i2c_write(chip->client, reg, data);
323}
324
325static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
326{
327 u8 reg = chip->dev_cfg->reg_data;
328 u8 mask;
329 u8 data;
330 u8 shift;
331 s32 err;
332
333 sx150x_find_cfg(offset, 1, &reg, &mask, &shift);
334 err = sx150x_i2c_read(chip->client, reg, &data);
335 if (err >= 0)
336 err = (data & mask) != 0 ? 1 : 0;
337
338 return err;
339}
340
341static void sx150x_set_oscio(struct sx150x_chip *chip, int val)
342{
343 sx150x_i2c_write(chip->client,
Wei Chenae9ca492014-12-04 20:12:09 +0800344 chip->dev_cfg->pri.x789.reg_clock,
Gregory Beanc34f16b2010-08-10 18:02:27 -0700345 (val ? 0x1f : 0x10));
346}
347
348static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val)
349{
350 sx150x_write_cfg(chip,
351 offset,
352 1,
353 chip->dev_cfg->reg_data,
354 (val ? 1 : 0));
355}
356
357static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset)
358{
359 return sx150x_write_cfg(chip,
360 offset,
361 1,
362 chip->dev_cfg->reg_dir,
363 1);
364}
365
366static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val)
367{
368 int err;
369
370 err = sx150x_write_cfg(chip,
371 offset,
372 1,
373 chip->dev_cfg->reg_data,
374 (val ? 1 : 0));
375 if (err >= 0)
376 err = sx150x_write_cfg(chip,
377 offset,
378 1,
379 chip->dev_cfg->reg_dir,
380 0);
381 return err;
382}
383
384static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
385{
Linus Walleij5b90b8c22015-12-07 14:36:31 +0100386 struct sx150x_chip *chip = gpiochip_get_data(gc);
Gregory Beanc34f16b2010-08-10 18:02:27 -0700387 int status = -EINVAL;
388
Gregory Beanc34f16b2010-08-10 18:02:27 -0700389 if (!offset_is_oscio(chip, offset)) {
390 mutex_lock(&chip->lock);
391 status = sx150x_get_io(chip, offset);
392 mutex_unlock(&chip->lock);
393 }
394
Linus Walleijf2e13d22015-12-21 11:41:06 +0100395 return (status < 0) ? status : !!status;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700396}
397
398static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
399{
Linus Walleij5b90b8c22015-12-07 14:36:31 +0100400 struct sx150x_chip *chip = gpiochip_get_data(gc);
Gregory Beanc34f16b2010-08-10 18:02:27 -0700401
402 mutex_lock(&chip->lock);
403 if (offset_is_oscio(chip, offset))
404 sx150x_set_oscio(chip, val);
405 else
406 sx150x_set_io(chip, offset, val);
407 mutex_unlock(&chip->lock);
408}
409
Linus Walleij04b86952016-04-09 13:13:36 +0200410static int sx150x_gpio_set_single_ended(struct gpio_chip *gc,
411 unsigned offset,
412 enum single_ended_mode mode)
413{
414 struct sx150x_chip *chip = gpiochip_get_data(gc);
415
416 /* On the SX160X 789 we can set open drain */
417 if (chip->dev_cfg->model != SX150X_789)
418 return -ENOTSUPP;
419
420 if (mode == LINE_MODE_PUSH_PULL)
421 return sx150x_write_cfg(chip,
422 offset,
423 1,
424 chip->dev_cfg->pri.x789.reg_drain,
425 0);
426
427 if (mode == LINE_MODE_OPEN_DRAIN)
428 return sx150x_write_cfg(chip,
429 offset,
430 1,
431 chip->dev_cfg->pri.x789.reg_drain,
432 1);
433 return -ENOTSUPP;
434}
435
Gregory Beanc34f16b2010-08-10 18:02:27 -0700436static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
437{
Linus Walleij5b90b8c22015-12-07 14:36:31 +0100438 struct sx150x_chip *chip = gpiochip_get_data(gc);
Gregory Beanc34f16b2010-08-10 18:02:27 -0700439 int status = -EINVAL;
440
Gregory Beanc34f16b2010-08-10 18:02:27 -0700441 if (!offset_is_oscio(chip, offset)) {
442 mutex_lock(&chip->lock);
443 status = sx150x_io_input(chip, offset);
444 mutex_unlock(&chip->lock);
445 }
446 return status;
447}
448
449static int sx150x_gpio_direction_output(struct gpio_chip *gc,
450 unsigned offset,
451 int val)
452{
Linus Walleij5b90b8c22015-12-07 14:36:31 +0100453 struct sx150x_chip *chip = gpiochip_get_data(gc);
Gregory Beanc34f16b2010-08-10 18:02:27 -0700454 int status = 0;
455
Gregory Beanc34f16b2010-08-10 18:02:27 -0700456 if (!offset_is_oscio(chip, offset)) {
457 mutex_lock(&chip->lock);
458 status = sx150x_io_output(chip, offset, val);
459 mutex_unlock(&chip->lock);
460 }
461 return status;
462}
463
Lennert Buytenhek673860c2011-01-12 17:00:18 -0800464static void sx150x_irq_mask(struct irq_data *d)
Gregory Beanc34f16b2010-08-10 18:02:27 -0700465{
Linus Walleij5b90b8c22015-12-07 14:36:31 +0100466 struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
Wei Chen093e9432014-12-04 20:12:08 +0800467 unsigned n = d->hwirq;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700468
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100469 chip->irq_masked |= (1 << n);
470 chip->irq_update = n;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700471}
472
Lennert Buytenhek673860c2011-01-12 17:00:18 -0800473static void sx150x_irq_unmask(struct irq_data *d)
Gregory Beanc34f16b2010-08-10 18:02:27 -0700474{
Linus Walleij5b90b8c22015-12-07 14:36:31 +0100475 struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
Wei Chen093e9432014-12-04 20:12:08 +0800476 unsigned n = d->hwirq;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700477
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100478 chip->irq_masked &= ~(1 << n);
479 chip->irq_update = n;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700480}
481
Lennert Buytenhek673860c2011-01-12 17:00:18 -0800482static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
Gregory Beanc34f16b2010-08-10 18:02:27 -0700483{
Linus Walleij5b90b8c22015-12-07 14:36:31 +0100484 struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
Gregory Beanc34f16b2010-08-10 18:02:27 -0700485 unsigned n, val = 0;
486
487 if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
488 return -EINVAL;
489
Wei Chen093e9432014-12-04 20:12:08 +0800490 n = d->hwirq;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700491
492 if (flow_type & IRQ_TYPE_EDGE_RISING)
493 val |= 0x1;
494 if (flow_type & IRQ_TYPE_EDGE_FALLING)
495 val |= 0x2;
496
497 chip->irq_sense &= ~(3UL << (n * 2));
498 chip->irq_sense |= val << (n * 2);
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100499 chip->irq_update = n;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700500 return 0;
501}
502
503static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
504{
505 struct sx150x_chip *chip = (struct sx150x_chip *)dev_id;
506 unsigned nhandled = 0;
507 unsigned sub_irq;
508 unsigned n;
509 s32 err;
510 u8 val;
511 int i;
512
513 for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
514 err = sx150x_i2c_read(chip->client,
515 chip->dev_cfg->reg_irq_src - i,
516 &val);
517 if (err < 0)
518 continue;
519
520 sx150x_i2c_write(chip->client,
521 chip->dev_cfg->reg_irq_src - i,
522 val);
523 for (n = 0; n < 8; ++n) {
524 if (val & (1 << n)) {
Wei Chen093e9432014-12-04 20:12:08 +0800525 sub_irq = irq_find_mapping(
526 chip->gpio_chip.irqdomain,
527 (i * 8) + n);
Gregory Beanc34f16b2010-08-10 18:02:27 -0700528 handle_nested_irq(sub_irq);
529 ++nhandled;
530 }
531 }
532 }
533
534 return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
535}
536
Lennert Buytenhek673860c2011-01-12 17:00:18 -0800537static void sx150x_irq_bus_lock(struct irq_data *d)
Gregory Beanc34f16b2010-08-10 18:02:27 -0700538{
Linus Walleij5b90b8c22015-12-07 14:36:31 +0100539 struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
Gregory Beanc34f16b2010-08-10 18:02:27 -0700540
541 mutex_lock(&chip->lock);
542}
543
Lennert Buytenhek673860c2011-01-12 17:00:18 -0800544static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
Gregory Beanc34f16b2010-08-10 18:02:27 -0700545{
Linus Walleij5b90b8c22015-12-07 14:36:31 +0100546 struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
Gregory Beanc34f16b2010-08-10 18:02:27 -0700547 unsigned n;
548
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100549 if (chip->irq_update == NO_UPDATE_PENDING)
550 goto out;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700551
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100552 n = chip->irq_update;
553 chip->irq_update = NO_UPDATE_PENDING;
554
555 /* Avoid updates if nothing changed */
556 if (chip->dev_sense == chip->irq_sense &&
Axel Linaab0b122014-12-16 14:22:27 +0800557 chip->dev_masked == chip->irq_masked)
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100558 goto out;
559
560 chip->dev_sense = chip->irq_sense;
561 chip->dev_masked = chip->irq_masked;
562
563 if (chip->irq_masked & (1 << n)) {
564 sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1);
565 sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0);
566 } else {
567 sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0);
568 sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense,
569 chip->irq_sense >> (n * 2));
570 }
571out:
Gregory Beanc34f16b2010-08-10 18:02:27 -0700572 mutex_unlock(&chip->lock);
573}
574
575static void sx150x_init_chip(struct sx150x_chip *chip,
576 struct i2c_client *client,
577 kernel_ulong_t driver_data,
578 struct sx150x_platform_data *pdata)
579{
580 mutex_init(&chip->lock);
581
582 chip->client = client;
583 chip->dev_cfg = &sx150x_devices[driver_data];
Linus Walleij58383c72015-11-04 09:56:26 +0100584 chip->gpio_chip.parent = &client->dev;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700585 chip->gpio_chip.label = client->name;
586 chip->gpio_chip.direction_input = sx150x_gpio_direction_input;
587 chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
588 chip->gpio_chip.get = sx150x_gpio_get;
589 chip->gpio_chip.set = sx150x_gpio_set;
Linus Walleij04b86952016-04-09 13:13:36 +0200590 chip->gpio_chip.set_single_ended = sx150x_gpio_set_single_ended;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700591 chip->gpio_chip.base = pdata->gpio_base;
Linus Walleij9fb1f392013-12-04 14:42:46 +0100592 chip->gpio_chip.can_sleep = true;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700593 chip->gpio_chip.ngpio = chip->dev_cfg->ngpios;
Linus Walleij16858cc2015-01-22 09:45:24 +0100594#ifdef CONFIG_OF_GPIO
Wei Chen04d22642015-01-15 08:16:10 +0800595 chip->gpio_chip.of_node = client->dev.of_node;
596 chip->gpio_chip.of_gpio_n_cells = 2;
Linus Walleij16858cc2015-01-22 09:45:24 +0100597#endif
Gregory Beanc34f16b2010-08-10 18:02:27 -0700598 if (pdata->oscio_is_gpo)
599 ++chip->gpio_chip.ngpio;
600
Lennert Buytenhek673860c2011-01-12 17:00:18 -0800601 chip->irq_chip.name = client->name;
602 chip->irq_chip.irq_mask = sx150x_irq_mask;
603 chip->irq_chip.irq_unmask = sx150x_irq_unmask;
604 chip->irq_chip.irq_set_type = sx150x_irq_set_type;
605 chip->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
606 chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
607 chip->irq_summary = -1;
608 chip->irq_base = -1;
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100609 chip->irq_masked = ~0;
Lennert Buytenhek673860c2011-01-12 17:00:18 -0800610 chip->irq_sense = 0;
Thomas Gleixner0ff56cd2011-02-14 18:08:51 +0100611 chip->dev_masked = ~0;
612 chip->dev_sense = 0;
613 chip->irq_update = NO_UPDATE_PENDING;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700614}
615
616static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
617{
618 int err = 0;
619 unsigned n;
620
621 for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
622 err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
623 return err;
624}
625
Gregory Bean5affb602010-09-09 16:38:02 -0700626static int sx150x_reset(struct sx150x_chip *chip)
627{
628 int err;
629
630 err = i2c_smbus_write_byte_data(chip->client,
Wei Chenae9ca492014-12-04 20:12:09 +0800631 chip->dev_cfg->pri.x789.reg_reset,
Gregory Bean5affb602010-09-09 16:38:02 -0700632 0x12);
633 if (err < 0)
634 return err;
635
636 err = i2c_smbus_write_byte_data(chip->client,
Wei Chenae9ca492014-12-04 20:12:09 +0800637 chip->dev_cfg->pri.x789.reg_reset,
Gregory Bean5affb602010-09-09 16:38:02 -0700638 0x34);
639 return err;
640}
641
Gregory Beanc34f16b2010-08-10 18:02:27 -0700642static int sx150x_init_hw(struct sx150x_chip *chip,
643 struct sx150x_platform_data *pdata)
644{
645 int err = 0;
646
Gregory Bean5affb602010-09-09 16:38:02 -0700647 if (pdata->reset_during_probe) {
648 err = sx150x_reset(chip);
649 if (err < 0)
650 return err;
651 }
Gregory Beanc34f16b2010-08-10 18:02:27 -0700652
Wei Chenae9ca492014-12-04 20:12:09 +0800653 if (chip->dev_cfg->model == SX150X_789)
654 err = sx150x_i2c_write(chip->client,
655 chip->dev_cfg->pri.x789.reg_misc,
656 0x01);
Peter Rosin50e8df02015-12-15 23:01:34 +0100657 else if (chip->dev_cfg->model == SX150X_456)
Wei Chenae9ca492014-12-04 20:12:09 +0800658 err = sx150x_i2c_write(chip->client,
659 chip->dev_cfg->pri.x456.reg_advance,
660 0x04);
Peter Rosin50e8df02015-12-15 23:01:34 +0100661 else
662 err = sx150x_i2c_write(chip->client,
663 chip->dev_cfg->pri.x123.reg_advance,
664 0x00);
Gregory Beanc34f16b2010-08-10 18:02:27 -0700665 if (err < 0)
666 return err;
667
668 err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
669 pdata->io_pullup_ena);
670 if (err < 0)
671 return err;
672
673 err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
674 pdata->io_pulldn_ena);
675 if (err < 0)
676 return err;
677
Wei Chenae9ca492014-12-04 20:12:09 +0800678 if (chip->dev_cfg->model == SX150X_789) {
679 err = sx150x_init_io(chip,
Wei Chenae9ca492014-12-04 20:12:09 +0800680 chip->dev_cfg->pri.x789.reg_polarity,
681 pdata->io_polarity);
682 if (err < 0)
683 return err;
Peter Rosin50e8df02015-12-15 23:01:34 +0100684 } else if (chip->dev_cfg->model == SX150X_456) {
Wei Chenae9ca492014-12-04 20:12:09 +0800685 /* Set all pins to work in normal mode */
686 err = sx150x_init_io(chip,
687 chip->dev_cfg->pri.x456.reg_pld_mode,
688 0);
689 if (err < 0)
690 return err;
Peter Rosin50e8df02015-12-15 23:01:34 +0100691 } else {
692 /* Set all pins to work in normal mode */
693 err = sx150x_init_io(chip,
694 chip->dev_cfg->pri.x123.reg_pld_mode,
695 0);
696 if (err < 0)
697 return err;
Wei Chenae9ca492014-12-04 20:12:09 +0800698 }
699
Gregory Beanc34f16b2010-08-10 18:02:27 -0700700
701 if (pdata->oscio_is_gpo)
702 sx150x_set_oscio(chip, 0);
703
704 return err;
705}
706
707static int sx150x_install_irq_chip(struct sx150x_chip *chip,
708 int irq_summary,
709 int irq_base)
710{
711 int err;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700712
713 chip->irq_summary = irq_summary;
714 chip->irq_base = irq_base;
715
Wei Chen093e9432014-12-04 20:12:08 +0800716 /* Add gpio chip to irq subsystem */
717 err = gpiochip_irqchip_add(&chip->gpio_chip,
718 &chip->irq_chip, chip->irq_base,
719 handle_edge_irq, IRQ_TYPE_EDGE_BOTH);
720 if (err) {
721 dev_err(&chip->client->dev,
722 "could not connect irqchip to gpiochip\n");
723 return err;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700724 }
725
Nikolay Balandin644c8df2013-05-28 15:02:50 -0700726 err = devm_request_threaded_irq(&chip->client->dev,
Wei Chen093e9432014-12-04 20:12:08 +0800727 irq_summary, NULL, sx150x_irq_thread_fn,
728 IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_FALLING,
729 chip->irq_chip.name, chip);
Gregory Beanc34f16b2010-08-10 18:02:27 -0700730 if (err < 0) {
731 chip->irq_summary = -1;
732 chip->irq_base = -1;
733 }
734
735 return err;
736}
737
Bill Pemberton38363092012-11-19 13:22:34 -0500738static int sx150x_probe(struct i2c_client *client,
Gregory Beanc34f16b2010-08-10 18:02:27 -0700739 const struct i2c_device_id *id)
740{
741 static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
742 I2C_FUNC_SMBUS_WRITE_WORD_DATA;
743 struct sx150x_platform_data *pdata;
744 struct sx150x_chip *chip;
745 int rc;
746
Jingoo Hane56aee12013-07-30 17:08:05 +0900747 pdata = dev_get_platdata(&client->dev);
Gregory Beanc34f16b2010-08-10 18:02:27 -0700748 if (!pdata)
749 return -EINVAL;
750
751 if (!i2c_check_functionality(client->adapter, i2c_funcs))
752 return -ENOSYS;
753
Nikolay Balandin644c8df2013-05-28 15:02:50 -0700754 chip = devm_kzalloc(&client->dev,
755 sizeof(struct sx150x_chip), GFP_KERNEL);
Gregory Beanc34f16b2010-08-10 18:02:27 -0700756 if (!chip)
757 return -ENOMEM;
758
759 sx150x_init_chip(chip, client, id->driver_data, pdata);
760 rc = sx150x_init_hw(chip, pdata);
761 if (rc < 0)
Nikolay Balandin644c8df2013-05-28 15:02:50 -0700762 return rc;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700763
Laxman Dewanganc7c8a8f2016-02-22 17:43:28 +0530764 rc = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
Nikolay Balandin644c8df2013-05-28 15:02:50 -0700765 if (rc)
766 return rc;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700767
768 if (pdata->irq_summary >= 0) {
769 rc = sx150x_install_irq_chip(chip,
770 pdata->irq_summary,
771 pdata->irq_base);
772 if (rc < 0)
Laxman Dewanganc7c8a8f2016-02-22 17:43:28 +0530773 return rc;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700774 }
775
776 i2c_set_clientdata(client, chip);
777
778 return 0;
Gregory Beanc34f16b2010-08-10 18:02:27 -0700779}
780
781static struct i2c_driver sx150x_driver = {
782 .driver = {
783 .name = "sx150x",
Linus Walleij16858cc2015-01-22 09:45:24 +0100784 .of_match_table = of_match_ptr(sx150x_of_match),
Gregory Beanc34f16b2010-08-10 18:02:27 -0700785 },
786 .probe = sx150x_probe,
Gregory Beanc34f16b2010-08-10 18:02:27 -0700787 .id_table = sx150x_id,
788};
789
790static int __init sx150x_init(void)
791{
792 return i2c_add_driver(&sx150x_driver);
793}
794subsys_initcall(sx150x_init);