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c34f16b7 GB |
1 | /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License version 2 and | |
5 | * only version 2 as published by the Free Software Foundation. | |
6 | * | |
7 | * This program is distributed in the hope that it will be useful, | |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10 | * GNU General Public License for more details. | |
11 | * | |
12 | * You should have received a copy of the GNU General Public License | |
13 | * along with this program; if not, write to the Free Software | |
14 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
15 | * 02110-1301, USA. | |
16 | */ | |
17 | #include <linux/gpio.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/irq.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/mutex.h> | |
24 | #include <linux/slab.h> | |
c34f16b7 GB |
25 | #include <linux/i2c/sx150x.h> |
26 | ||
0ff56cd8 TG |
27 | #define NO_UPDATE_PENDING -1 |
28 | ||
c34f16b7 GB |
29 | struct sx150x_device_data { |
30 | u8 reg_pullup; | |
31 | u8 reg_pulldn; | |
32 | u8 reg_drain; | |
33 | u8 reg_polarity; | |
34 | u8 reg_dir; | |
35 | u8 reg_data; | |
36 | u8 reg_irq_mask; | |
37 | u8 reg_irq_src; | |
38 | u8 reg_sense; | |
39 | u8 reg_clock; | |
40 | u8 reg_misc; | |
41 | u8 reg_reset; | |
42 | u8 ngpios; | |
43 | }; | |
44 | ||
45 | struct sx150x_chip { | |
46 | struct gpio_chip gpio_chip; | |
47 | struct i2c_client *client; | |
48 | const struct sx150x_device_data *dev_cfg; | |
49 | int irq_summary; | |
50 | int irq_base; | |
0ff56cd8 | 51 | int irq_update; |
c34f16b7 | 52 | u32 irq_sense; |
0ff56cd8 TG |
53 | u32 irq_masked; |
54 | u32 dev_sense; | |
55 | u32 dev_masked; | |
c34f16b7 GB |
56 | struct irq_chip irq_chip; |
57 | struct mutex lock; | |
58 | }; | |
59 | ||
60 | static const struct sx150x_device_data sx150x_devices[] = { | |
61 | [0] = { /* sx1508q */ | |
62 | .reg_pullup = 0x03, | |
63 | .reg_pulldn = 0x04, | |
64 | .reg_drain = 0x05, | |
65 | .reg_polarity = 0x06, | |
66 | .reg_dir = 0x07, | |
67 | .reg_data = 0x08, | |
68 | .reg_irq_mask = 0x09, | |
69 | .reg_irq_src = 0x0c, | |
70 | .reg_sense = 0x0b, | |
71 | .reg_clock = 0x0f, | |
72 | .reg_misc = 0x10, | |
73 | .reg_reset = 0x7d, | |
74 | .ngpios = 8 | |
75 | }, | |
76 | [1] = { /* sx1509q */ | |
77 | .reg_pullup = 0x07, | |
78 | .reg_pulldn = 0x09, | |
79 | .reg_drain = 0x0b, | |
80 | .reg_polarity = 0x0d, | |
81 | .reg_dir = 0x0f, | |
82 | .reg_data = 0x11, | |
83 | .reg_irq_mask = 0x13, | |
84 | .reg_irq_src = 0x19, | |
85 | .reg_sense = 0x17, | |
86 | .reg_clock = 0x1e, | |
87 | .reg_misc = 0x1f, | |
88 | .reg_reset = 0x7d, | |
89 | .ngpios = 16 | |
90 | }, | |
91 | }; | |
92 | ||
93 | static const struct i2c_device_id sx150x_id[] = { | |
94 | {"sx1508q", 0}, | |
95 | {"sx1509q", 1}, | |
96 | {} | |
97 | }; | |
98 | MODULE_DEVICE_TABLE(i2c, sx150x_id); | |
99 | ||
100 | static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val) | |
101 | { | |
102 | s32 err = i2c_smbus_write_byte_data(client, reg, val); | |
103 | ||
104 | if (err < 0) | |
105 | dev_warn(&client->dev, | |
106 | "i2c write fail: can't write %02x to %02x: %d\n", | |
107 | val, reg, err); | |
108 | return err; | |
109 | } | |
110 | ||
111 | static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val) | |
112 | { | |
113 | s32 err = i2c_smbus_read_byte_data(client, reg); | |
114 | ||
115 | if (err >= 0) | |
116 | *val = err; | |
117 | else | |
118 | dev_warn(&client->dev, | |
119 | "i2c read fail: can't read from %02x: %d\n", | |
120 | reg, err); | |
121 | return err; | |
122 | } | |
123 | ||
124 | static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset) | |
125 | { | |
126 | return (chip->dev_cfg->ngpios == offset); | |
127 | } | |
128 | ||
129 | /* | |
130 | * These utility functions solve the common problem of locating and setting | |
131 | * configuration bits. Configuration bits are grouped into registers | |
132 | * whose indexes increase downwards. For example, with eight-bit registers, | |
133 | * sixteen gpios would have their config bits grouped in the following order: | |
134 | * REGISTER N-1 [ f e d c b a 9 8 ] | |
135 | * N [ 7 6 5 4 3 2 1 0 ] | |
136 | * | |
137 | * For multi-bit configurations, the pattern gets wider: | |
138 | * REGISTER N-3 [ f f e e d d c c ] | |
139 | * N-2 [ b b a a 9 9 8 8 ] | |
140 | * N-1 [ 7 7 6 6 5 5 4 4 ] | |
141 | * N [ 3 3 2 2 1 1 0 0 ] | |
142 | * | |
143 | * Given the address of the starting register 'N', the index of the gpio | |
144 | * whose configuration we seek to change, and the width in bits of that | |
145 | * configuration, these functions allow us to locate the correct | |
146 | * register and mask the correct bits. | |
147 | */ | |
148 | static inline void sx150x_find_cfg(u8 offset, u8 width, | |
149 | u8 *reg, u8 *mask, u8 *shift) | |
150 | { | |
151 | *reg -= offset * width / 8; | |
152 | *mask = (1 << width) - 1; | |
153 | *shift = (offset * width) % 8; | |
154 | *mask <<= *shift; | |
155 | } | |
156 | ||
157 | static s32 sx150x_write_cfg(struct sx150x_chip *chip, | |
158 | u8 offset, u8 width, u8 reg, u8 val) | |
159 | { | |
160 | u8 mask; | |
161 | u8 data; | |
162 | u8 shift; | |
163 | s32 err; | |
164 | ||
165 | sx150x_find_cfg(offset, width, ®, &mask, &shift); | |
166 | err = sx150x_i2c_read(chip->client, reg, &data); | |
167 | if (err < 0) | |
168 | return err; | |
169 | ||
170 | data &= ~mask; | |
171 | data |= (val << shift) & mask; | |
172 | return sx150x_i2c_write(chip->client, reg, data); | |
173 | } | |
174 | ||
175 | static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset) | |
176 | { | |
177 | u8 reg = chip->dev_cfg->reg_data; | |
178 | u8 mask; | |
179 | u8 data; | |
180 | u8 shift; | |
181 | s32 err; | |
182 | ||
183 | sx150x_find_cfg(offset, 1, ®, &mask, &shift); | |
184 | err = sx150x_i2c_read(chip->client, reg, &data); | |
185 | if (err >= 0) | |
186 | err = (data & mask) != 0 ? 1 : 0; | |
187 | ||
188 | return err; | |
189 | } | |
190 | ||
191 | static void sx150x_set_oscio(struct sx150x_chip *chip, int val) | |
192 | { | |
193 | sx150x_i2c_write(chip->client, | |
194 | chip->dev_cfg->reg_clock, | |
195 | (val ? 0x1f : 0x10)); | |
196 | } | |
197 | ||
198 | static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val) | |
199 | { | |
200 | sx150x_write_cfg(chip, | |
201 | offset, | |
202 | 1, | |
203 | chip->dev_cfg->reg_data, | |
204 | (val ? 1 : 0)); | |
205 | } | |
206 | ||
207 | static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset) | |
208 | { | |
209 | return sx150x_write_cfg(chip, | |
210 | offset, | |
211 | 1, | |
212 | chip->dev_cfg->reg_dir, | |
213 | 1); | |
214 | } | |
215 | ||
216 | static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val) | |
217 | { | |
218 | int err; | |
219 | ||
220 | err = sx150x_write_cfg(chip, | |
221 | offset, | |
222 | 1, | |
223 | chip->dev_cfg->reg_data, | |
224 | (val ? 1 : 0)); | |
225 | if (err >= 0) | |
226 | err = sx150x_write_cfg(chip, | |
227 | offset, | |
228 | 1, | |
229 | chip->dev_cfg->reg_dir, | |
230 | 0); | |
231 | return err; | |
232 | } | |
233 | ||
234 | static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset) | |
235 | { | |
236 | struct sx150x_chip *chip; | |
237 | int status = -EINVAL; | |
238 | ||
239 | chip = container_of(gc, struct sx150x_chip, gpio_chip); | |
240 | ||
241 | if (!offset_is_oscio(chip, offset)) { | |
242 | mutex_lock(&chip->lock); | |
243 | status = sx150x_get_io(chip, offset); | |
244 | mutex_unlock(&chip->lock); | |
245 | } | |
246 | ||
247 | return status; | |
248 | } | |
249 | ||
250 | static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val) | |
251 | { | |
252 | struct sx150x_chip *chip; | |
253 | ||
254 | chip = container_of(gc, struct sx150x_chip, gpio_chip); | |
255 | ||
256 | mutex_lock(&chip->lock); | |
257 | if (offset_is_oscio(chip, offset)) | |
258 | sx150x_set_oscio(chip, val); | |
259 | else | |
260 | sx150x_set_io(chip, offset, val); | |
261 | mutex_unlock(&chip->lock); | |
262 | } | |
263 | ||
264 | static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset) | |
265 | { | |
266 | struct sx150x_chip *chip; | |
267 | int status = -EINVAL; | |
268 | ||
269 | chip = container_of(gc, struct sx150x_chip, gpio_chip); | |
270 | ||
271 | if (!offset_is_oscio(chip, offset)) { | |
272 | mutex_lock(&chip->lock); | |
273 | status = sx150x_io_input(chip, offset); | |
274 | mutex_unlock(&chip->lock); | |
275 | } | |
276 | return status; | |
277 | } | |
278 | ||
279 | static int sx150x_gpio_direction_output(struct gpio_chip *gc, | |
280 | unsigned offset, | |
281 | int val) | |
282 | { | |
283 | struct sx150x_chip *chip; | |
284 | int status = 0; | |
285 | ||
286 | chip = container_of(gc, struct sx150x_chip, gpio_chip); | |
287 | ||
288 | if (!offset_is_oscio(chip, offset)) { | |
289 | mutex_lock(&chip->lock); | |
290 | status = sx150x_io_output(chip, offset, val); | |
291 | mutex_unlock(&chip->lock); | |
292 | } | |
293 | return status; | |
294 | } | |
295 | ||
296 | static int sx150x_gpio_to_irq(struct gpio_chip *gc, unsigned offset) | |
297 | { | |
298 | struct sx150x_chip *chip; | |
299 | ||
300 | chip = container_of(gc, struct sx150x_chip, gpio_chip); | |
301 | ||
302 | if (offset >= chip->dev_cfg->ngpios) | |
303 | return -EINVAL; | |
304 | ||
305 | if (chip->irq_base < 0) | |
306 | return -EINVAL; | |
307 | ||
308 | return chip->irq_base + offset; | |
309 | } | |
310 | ||
673860c1 | 311 | static void sx150x_irq_mask(struct irq_data *d) |
c34f16b7 | 312 | { |
a3b93081 | 313 | struct sx150x_chip *chip = irq_data_get_irq_chip_data(d); |
c34f16b7 GB |
314 | unsigned n; |
315 | ||
673860c1 | 316 | n = d->irq - chip->irq_base; |
0ff56cd8 TG |
317 | chip->irq_masked |= (1 << n); |
318 | chip->irq_update = n; | |
c34f16b7 GB |
319 | } |
320 | ||
673860c1 | 321 | static void sx150x_irq_unmask(struct irq_data *d) |
c34f16b7 | 322 | { |
a3b93081 | 323 | struct sx150x_chip *chip = irq_data_get_irq_chip_data(d); |
c34f16b7 GB |
324 | unsigned n; |
325 | ||
673860c1 | 326 | n = d->irq - chip->irq_base; |
0ff56cd8 TG |
327 | chip->irq_masked &= ~(1 << n); |
328 | chip->irq_update = n; | |
c34f16b7 GB |
329 | } |
330 | ||
673860c1 | 331 | static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type) |
c34f16b7 | 332 | { |
a3b93081 | 333 | struct sx150x_chip *chip = irq_data_get_irq_chip_data(d); |
c34f16b7 GB |
334 | unsigned n, val = 0; |
335 | ||
336 | if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) | |
337 | return -EINVAL; | |
338 | ||
673860c1 | 339 | n = d->irq - chip->irq_base; |
c34f16b7 GB |
340 | |
341 | if (flow_type & IRQ_TYPE_EDGE_RISING) | |
342 | val |= 0x1; | |
343 | if (flow_type & IRQ_TYPE_EDGE_FALLING) | |
344 | val |= 0x2; | |
345 | ||
346 | chip->irq_sense &= ~(3UL << (n * 2)); | |
347 | chip->irq_sense |= val << (n * 2); | |
0ff56cd8 | 348 | chip->irq_update = n; |
c34f16b7 GB |
349 | return 0; |
350 | } | |
351 | ||
352 | static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id) | |
353 | { | |
354 | struct sx150x_chip *chip = (struct sx150x_chip *)dev_id; | |
355 | unsigned nhandled = 0; | |
356 | unsigned sub_irq; | |
357 | unsigned n; | |
358 | s32 err; | |
359 | u8 val; | |
360 | int i; | |
361 | ||
362 | for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) { | |
363 | err = sx150x_i2c_read(chip->client, | |
364 | chip->dev_cfg->reg_irq_src - i, | |
365 | &val); | |
366 | if (err < 0) | |
367 | continue; | |
368 | ||
369 | sx150x_i2c_write(chip->client, | |
370 | chip->dev_cfg->reg_irq_src - i, | |
371 | val); | |
372 | for (n = 0; n < 8; ++n) { | |
373 | if (val & (1 << n)) { | |
374 | sub_irq = chip->irq_base + (i * 8) + n; | |
375 | handle_nested_irq(sub_irq); | |
376 | ++nhandled; | |
377 | } | |
378 | } | |
379 | } | |
380 | ||
381 | return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE); | |
382 | } | |
383 | ||
673860c1 | 384 | static void sx150x_irq_bus_lock(struct irq_data *d) |
c34f16b7 | 385 | { |
a3b93081 | 386 | struct sx150x_chip *chip = irq_data_get_irq_chip_data(d); |
c34f16b7 GB |
387 | |
388 | mutex_lock(&chip->lock); | |
389 | } | |
390 | ||
673860c1 | 391 | static void sx150x_irq_bus_sync_unlock(struct irq_data *d) |
c34f16b7 | 392 | { |
a3b93081 | 393 | struct sx150x_chip *chip = irq_data_get_irq_chip_data(d); |
c34f16b7 GB |
394 | unsigned n; |
395 | ||
0ff56cd8 TG |
396 | if (chip->irq_update == NO_UPDATE_PENDING) |
397 | goto out; | |
398 | ||
399 | n = chip->irq_update; | |
400 | chip->irq_update = NO_UPDATE_PENDING; | |
c34f16b7 | 401 | |
0ff56cd8 TG |
402 | /* Avoid updates if nothing changed */ |
403 | if (chip->dev_sense == chip->irq_sense && | |
404 | chip->dev_sense == chip->irq_masked) | |
405 | goto out; | |
406 | ||
407 | chip->dev_sense = chip->irq_sense; | |
408 | chip->dev_masked = chip->irq_masked; | |
409 | ||
410 | if (chip->irq_masked & (1 << n)) { | |
411 | sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1); | |
412 | sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0); | |
413 | } else { | |
414 | sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0); | |
415 | sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, | |
416 | chip->irq_sense >> (n * 2)); | |
417 | } | |
418 | out: | |
c34f16b7 GB |
419 | mutex_unlock(&chip->lock); |
420 | } | |
421 | ||
422 | static void sx150x_init_chip(struct sx150x_chip *chip, | |
423 | struct i2c_client *client, | |
424 | kernel_ulong_t driver_data, | |
425 | struct sx150x_platform_data *pdata) | |
426 | { | |
427 | mutex_init(&chip->lock); | |
428 | ||
429 | chip->client = client; | |
430 | chip->dev_cfg = &sx150x_devices[driver_data]; | |
431 | chip->gpio_chip.label = client->name; | |
432 | chip->gpio_chip.direction_input = sx150x_gpio_direction_input; | |
433 | chip->gpio_chip.direction_output = sx150x_gpio_direction_output; | |
434 | chip->gpio_chip.get = sx150x_gpio_get; | |
435 | chip->gpio_chip.set = sx150x_gpio_set; | |
436 | chip->gpio_chip.to_irq = sx150x_gpio_to_irq; | |
437 | chip->gpio_chip.base = pdata->gpio_base; | |
9fb1f39e | 438 | chip->gpio_chip.can_sleep = true; |
c34f16b7 GB |
439 | chip->gpio_chip.ngpio = chip->dev_cfg->ngpios; |
440 | if (pdata->oscio_is_gpo) | |
441 | ++chip->gpio_chip.ngpio; | |
442 | ||
673860c1 LB |
443 | chip->irq_chip.name = client->name; |
444 | chip->irq_chip.irq_mask = sx150x_irq_mask; | |
445 | chip->irq_chip.irq_unmask = sx150x_irq_unmask; | |
446 | chip->irq_chip.irq_set_type = sx150x_irq_set_type; | |
447 | chip->irq_chip.irq_bus_lock = sx150x_irq_bus_lock; | |
448 | chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock; | |
449 | chip->irq_summary = -1; | |
450 | chip->irq_base = -1; | |
0ff56cd8 | 451 | chip->irq_masked = ~0; |
673860c1 | 452 | chip->irq_sense = 0; |
0ff56cd8 TG |
453 | chip->dev_masked = ~0; |
454 | chip->dev_sense = 0; | |
455 | chip->irq_update = NO_UPDATE_PENDING; | |
c34f16b7 GB |
456 | } |
457 | ||
458 | static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg) | |
459 | { | |
460 | int err = 0; | |
461 | unsigned n; | |
462 | ||
463 | for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n) | |
464 | err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8)); | |
465 | return err; | |
466 | } | |
467 | ||
5affb607 | 468 | static int sx150x_reset(struct sx150x_chip *chip) |
c34f16b7 | 469 | { |
5affb607 | 470 | int err; |
c34f16b7 | 471 | |
5affb607 | 472 | err = i2c_smbus_write_byte_data(chip->client, |
c34f16b7 | 473 | chip->dev_cfg->reg_reset, |
5affb607 | 474 | 0x12); |
c34f16b7 GB |
475 | if (err < 0) |
476 | return err; | |
477 | ||
5affb607 GB |
478 | err = i2c_smbus_write_byte_data(chip->client, |
479 | chip->dev_cfg->reg_reset, | |
480 | 0x34); | |
481 | return err; | |
482 | } | |
483 | ||
484 | static int sx150x_init_hw(struct sx150x_chip *chip, | |
485 | struct sx150x_platform_data *pdata) | |
486 | { | |
487 | int err = 0; | |
488 | ||
489 | if (pdata->reset_during_probe) { | |
490 | err = sx150x_reset(chip); | |
491 | if (err < 0) | |
492 | return err; | |
493 | } | |
494 | ||
c34f16b7 GB |
495 | err = sx150x_i2c_write(chip->client, |
496 | chip->dev_cfg->reg_misc, | |
497 | 0x01); | |
498 | if (err < 0) | |
499 | return err; | |
500 | ||
501 | err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup, | |
502 | pdata->io_pullup_ena); | |
503 | if (err < 0) | |
504 | return err; | |
505 | ||
506 | err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn, | |
507 | pdata->io_pulldn_ena); | |
508 | if (err < 0) | |
509 | return err; | |
510 | ||
511 | err = sx150x_init_io(chip, chip->dev_cfg->reg_drain, | |
512 | pdata->io_open_drain_ena); | |
513 | if (err < 0) | |
514 | return err; | |
515 | ||
516 | err = sx150x_init_io(chip, chip->dev_cfg->reg_polarity, | |
517 | pdata->io_polarity); | |
518 | if (err < 0) | |
519 | return err; | |
520 | ||
521 | if (pdata->oscio_is_gpo) | |
522 | sx150x_set_oscio(chip, 0); | |
523 | ||
524 | return err; | |
525 | } | |
526 | ||
527 | static int sx150x_install_irq_chip(struct sx150x_chip *chip, | |
528 | int irq_summary, | |
529 | int irq_base) | |
530 | { | |
531 | int err; | |
532 | unsigned n; | |
533 | unsigned irq; | |
534 | ||
535 | chip->irq_summary = irq_summary; | |
536 | chip->irq_base = irq_base; | |
537 | ||
538 | for (n = 0; n < chip->dev_cfg->ngpios; ++n) { | |
539 | irq = irq_base + n; | |
a3b93081 | 540 | irq_set_chip_data(irq, chip); |
b51804bc TG |
541 | irq_set_chip_and_handler(irq, &chip->irq_chip, handle_edge_irq); |
542 | irq_set_nested_thread(irq, 1); | |
c34f16b7 GB |
543 | #ifdef CONFIG_ARM |
544 | set_irq_flags(irq, IRQF_VALID); | |
545 | #else | |
b51804bc | 546 | irq_set_noprobe(irq); |
c34f16b7 GB |
547 | #endif |
548 | } | |
549 | ||
644c8df2 NB |
550 | err = devm_request_threaded_irq(&chip->client->dev, |
551 | irq_summary, | |
c34f16b7 GB |
552 | NULL, |
553 | sx150x_irq_thread_fn, | |
554 | IRQF_SHARED | IRQF_TRIGGER_FALLING, | |
555 | chip->irq_chip.name, | |
556 | chip); | |
557 | if (err < 0) { | |
558 | chip->irq_summary = -1; | |
559 | chip->irq_base = -1; | |
560 | } | |
561 | ||
562 | return err; | |
563 | } | |
564 | ||
565 | static void sx150x_remove_irq_chip(struct sx150x_chip *chip) | |
566 | { | |
567 | unsigned n; | |
568 | unsigned irq; | |
569 | ||
c34f16b7 GB |
570 | for (n = 0; n < chip->dev_cfg->ngpios; ++n) { |
571 | irq = chip->irq_base + n; | |
08f1b807 | 572 | irq_set_chip_and_handler(irq, NULL, NULL); |
c34f16b7 GB |
573 | } |
574 | } | |
575 | ||
3836309d | 576 | static int sx150x_probe(struct i2c_client *client, |
c34f16b7 GB |
577 | const struct i2c_device_id *id) |
578 | { | |
579 | static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA | | |
580 | I2C_FUNC_SMBUS_WRITE_WORD_DATA; | |
581 | struct sx150x_platform_data *pdata; | |
582 | struct sx150x_chip *chip; | |
583 | int rc; | |
584 | ||
e56aee18 | 585 | pdata = dev_get_platdata(&client->dev); |
c34f16b7 GB |
586 | if (!pdata) |
587 | return -EINVAL; | |
588 | ||
589 | if (!i2c_check_functionality(client->adapter, i2c_funcs)) | |
590 | return -ENOSYS; | |
591 | ||
644c8df2 NB |
592 | chip = devm_kzalloc(&client->dev, |
593 | sizeof(struct sx150x_chip), GFP_KERNEL); | |
c34f16b7 GB |
594 | if (!chip) |
595 | return -ENOMEM; | |
596 | ||
597 | sx150x_init_chip(chip, client, id->driver_data, pdata); | |
598 | rc = sx150x_init_hw(chip, pdata); | |
599 | if (rc < 0) | |
644c8df2 | 600 | return rc; |
c34f16b7 GB |
601 | |
602 | rc = gpiochip_add(&chip->gpio_chip); | |
644c8df2 NB |
603 | if (rc) |
604 | return rc; | |
c34f16b7 GB |
605 | |
606 | if (pdata->irq_summary >= 0) { | |
607 | rc = sx150x_install_irq_chip(chip, | |
608 | pdata->irq_summary, | |
609 | pdata->irq_base); | |
610 | if (rc < 0) | |
611 | goto probe_fail_post_gpiochip_add; | |
612 | } | |
613 | ||
614 | i2c_set_clientdata(client, chip); | |
615 | ||
616 | return 0; | |
617 | probe_fail_post_gpiochip_add: | |
9f5132ae | 618 | gpiochip_remove(&chip->gpio_chip); |
c34f16b7 GB |
619 | return rc; |
620 | } | |
621 | ||
206210ce | 622 | static int sx150x_remove(struct i2c_client *client) |
c34f16b7 GB |
623 | { |
624 | struct sx150x_chip *chip; | |
c34f16b7 GB |
625 | |
626 | chip = i2c_get_clientdata(client); | |
9f5132ae | 627 | gpiochip_remove(&chip->gpio_chip); |
c34f16b7 GB |
628 | |
629 | if (chip->irq_summary >= 0) | |
630 | sx150x_remove_irq_chip(chip); | |
631 | ||
c34f16b7 GB |
632 | return 0; |
633 | } | |
634 | ||
635 | static struct i2c_driver sx150x_driver = { | |
636 | .driver = { | |
637 | .name = "sx150x", | |
638 | .owner = THIS_MODULE | |
639 | }, | |
640 | .probe = sx150x_probe, | |
8283c4ff | 641 | .remove = sx150x_remove, |
c34f16b7 GB |
642 | .id_table = sx150x_id, |
643 | }; | |
644 | ||
645 | static int __init sx150x_init(void) | |
646 | { | |
647 | return i2c_add_driver(&sx150x_driver); | |
648 | } | |
649 | subsys_initcall(sx150x_init); | |
650 | ||
651 | static void __exit sx150x_exit(void) | |
652 | { | |
653 | return i2c_del_driver(&sx150x_driver); | |
654 | } | |
655 | module_exit(sx150x_exit); | |
656 | ||
657 | MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>"); | |
658 | MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders"); | |
659 | MODULE_LICENSE("GPL v2"); | |
660 | MODULE_ALIAS("i2c:sx150x"); |