Commit | Line | Data |
---|---|---|
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 | 25 | #include <linux/i2c/sx150x.h> |
04d2264c WC |
26 | #include <linux/of.h> |
27 | #include <linux/of_address.h> | |
28 | #include <linux/of_irq.h> | |
29 | #include <linux/of_gpio.h> | |
30 | #include <linux/of_device.h> | |
c34f16b7 | 31 | |
0ff56cd8 TG |
32 | #define NO_UPDATE_PENDING -1 |
33 | ||
ae9ca493 WC |
34 | /* The chip models of sx150x */ |
35 | #define SX150X_456 0 | |
36 | #define SX150X_789 1 | |
37 | ||
38 | struct sx150x_456_pri { | |
39 | u8 reg_pld_mode; | |
40 | u8 reg_pld_table0; | |
41 | u8 reg_pld_table1; | |
42 | u8 reg_pld_table2; | |
43 | u8 reg_pld_table3; | |
44 | u8 reg_pld_table4; | |
45 | u8 reg_advance; | |
46 | }; | |
47 | ||
48 | struct sx150x_789_pri { | |
49 | u8 reg_drain; | |
50 | u8 reg_polarity; | |
51 | u8 reg_clock; | |
52 | u8 reg_misc; | |
53 | u8 reg_reset; | |
54 | u8 ngpios; | |
55 | }; | |
56 | ||
c34f16b7 | 57 | struct sx150x_device_data { |
ae9ca493 | 58 | u8 model; |
c34f16b7 GB |
59 | u8 reg_pullup; |
60 | u8 reg_pulldn; | |
c34f16b7 GB |
61 | u8 reg_dir; |
62 | u8 reg_data; | |
63 | u8 reg_irq_mask; | |
64 | u8 reg_irq_src; | |
65 | u8 reg_sense; | |
c34f16b7 | 66 | u8 ngpios; |
ae9ca493 WC |
67 | union { |
68 | struct sx150x_456_pri x456; | |
69 | struct sx150x_789_pri x789; | |
70 | } pri; | |
c34f16b7 GB |
71 | }; |
72 | ||
73 | struct sx150x_chip { | |
74 | struct gpio_chip gpio_chip; | |
75 | struct i2c_client *client; | |
76 | const struct sx150x_device_data *dev_cfg; | |
77 | int irq_summary; | |
78 | int irq_base; | |
0ff56cd8 | 79 | int irq_update; |
c34f16b7 | 80 | u32 irq_sense; |
0ff56cd8 TG |
81 | u32 irq_masked; |
82 | u32 dev_sense; | |
83 | u32 dev_masked; | |
c34f16b7 GB |
84 | struct irq_chip irq_chip; |
85 | struct mutex lock; | |
86 | }; | |
87 | ||
88 | static const struct sx150x_device_data sx150x_devices[] = { | |
89 | [0] = { /* sx1508q */ | |
ae9ca493 WC |
90 | .model = SX150X_789, |
91 | .reg_pullup = 0x03, | |
92 | .reg_pulldn = 0x04, | |
93 | .reg_dir = 0x07, | |
94 | .reg_data = 0x08, | |
95 | .reg_irq_mask = 0x09, | |
96 | .reg_irq_src = 0x0c, | |
97 | .reg_sense = 0x0b, | |
98 | .pri.x789 = { | |
99 | .reg_drain = 0x05, | |
100 | .reg_polarity = 0x06, | |
101 | .reg_clock = 0x0f, | |
102 | .reg_misc = 0x10, | |
103 | .reg_reset = 0x7d, | |
104 | }, | |
105 | .ngpios = 8, | |
c34f16b7 GB |
106 | }, |
107 | [1] = { /* sx1509q */ | |
ae9ca493 WC |
108 | .model = SX150X_789, |
109 | .reg_pullup = 0x07, | |
110 | .reg_pulldn = 0x09, | |
111 | .reg_dir = 0x0f, | |
112 | .reg_data = 0x11, | |
113 | .reg_irq_mask = 0x13, | |
114 | .reg_irq_src = 0x19, | |
115 | .reg_sense = 0x17, | |
116 | .pri.x789 = { | |
117 | .reg_drain = 0x0b, | |
118 | .reg_polarity = 0x0d, | |
119 | .reg_clock = 0x1e, | |
120 | .reg_misc = 0x1f, | |
121 | .reg_reset = 0x7d, | |
122 | }, | |
123 | .ngpios = 16 | |
124 | }, | |
125 | [2] = { /* sx1506q */ | |
126 | .model = SX150X_456, | |
127 | .reg_pullup = 0x05, | |
128 | .reg_pulldn = 0x07, | |
129 | .reg_dir = 0x03, | |
130 | .reg_data = 0x01, | |
131 | .reg_irq_mask = 0x09, | |
132 | .reg_irq_src = 0x0f, | |
133 | .reg_sense = 0x0d, | |
134 | .pri.x456 = { | |
135 | .reg_pld_mode = 0x21, | |
136 | .reg_pld_table0 = 0x23, | |
137 | .reg_pld_table1 = 0x25, | |
138 | .reg_pld_table2 = 0x27, | |
139 | .reg_pld_table3 = 0x29, | |
140 | .reg_pld_table4 = 0x2b, | |
141 | .reg_advance = 0xad, | |
142 | }, | |
143 | .ngpios = 16 | |
c34f16b7 GB |
144 | }, |
145 | }; | |
146 | ||
147 | static const struct i2c_device_id sx150x_id[] = { | |
148 | {"sx1508q", 0}, | |
149 | {"sx1509q", 1}, | |
ae9ca493 | 150 | {"sx1506q", 2}, |
c34f16b7 GB |
151 | {} |
152 | }; | |
153 | MODULE_DEVICE_TABLE(i2c, sx150x_id); | |
154 | ||
16858cc5 | 155 | static const struct of_device_id sx150x_of_match[] = { |
04d2264c WC |
156 | { .compatible = "semtech,sx1508q" }, |
157 | { .compatible = "semtech,sx1509q" }, | |
158 | { .compatible = "semtech,sx1506q" }, | |
159 | {}, | |
160 | }; | |
16858cc5 | 161 | MODULE_DEVICE_TABLE(of, sx150x_of_match); |
04d2264c | 162 | |
218f1f8b LW |
163 | struct sx150x_chip *to_sx150x(struct gpio_chip *gc) |
164 | { | |
165 | return container_of(gc, struct sx150x_chip, gpio_chip); | |
166 | } | |
167 | ||
c34f16b7 GB |
168 | static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val) |
169 | { | |
170 | s32 err = i2c_smbus_write_byte_data(client, reg, val); | |
171 | ||
172 | if (err < 0) | |
173 | dev_warn(&client->dev, | |
174 | "i2c write fail: can't write %02x to %02x: %d\n", | |
175 | val, reg, err); | |
176 | return err; | |
177 | } | |
178 | ||
179 | static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val) | |
180 | { | |
181 | s32 err = i2c_smbus_read_byte_data(client, reg); | |
182 | ||
183 | if (err >= 0) | |
184 | *val = err; | |
185 | else | |
186 | dev_warn(&client->dev, | |
187 | "i2c read fail: can't read from %02x: %d\n", | |
188 | reg, err); | |
189 | return err; | |
190 | } | |
191 | ||
192 | static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset) | |
193 | { | |
194 | return (chip->dev_cfg->ngpios == offset); | |
195 | } | |
196 | ||
197 | /* | |
198 | * These utility functions solve the common problem of locating and setting | |
199 | * configuration bits. Configuration bits are grouped into registers | |
200 | * whose indexes increase downwards. For example, with eight-bit registers, | |
201 | * sixteen gpios would have their config bits grouped in the following order: | |
202 | * REGISTER N-1 [ f e d c b a 9 8 ] | |
203 | * N [ 7 6 5 4 3 2 1 0 ] | |
204 | * | |
205 | * For multi-bit configurations, the pattern gets wider: | |
206 | * REGISTER N-3 [ f f e e d d c c ] | |
207 | * N-2 [ b b a a 9 9 8 8 ] | |
208 | * N-1 [ 7 7 6 6 5 5 4 4 ] | |
209 | * N [ 3 3 2 2 1 1 0 0 ] | |
210 | * | |
211 | * Given the address of the starting register 'N', the index of the gpio | |
212 | * whose configuration we seek to change, and the width in bits of that | |
213 | * configuration, these functions allow us to locate the correct | |
214 | * register and mask the correct bits. | |
215 | */ | |
216 | static inline void sx150x_find_cfg(u8 offset, u8 width, | |
217 | u8 *reg, u8 *mask, u8 *shift) | |
218 | { | |
219 | *reg -= offset * width / 8; | |
220 | *mask = (1 << width) - 1; | |
221 | *shift = (offset * width) % 8; | |
222 | *mask <<= *shift; | |
223 | } | |
224 | ||
225 | static s32 sx150x_write_cfg(struct sx150x_chip *chip, | |
226 | u8 offset, u8 width, u8 reg, u8 val) | |
227 | { | |
228 | u8 mask; | |
229 | u8 data; | |
230 | u8 shift; | |
231 | s32 err; | |
232 | ||
233 | sx150x_find_cfg(offset, width, ®, &mask, &shift); | |
234 | err = sx150x_i2c_read(chip->client, reg, &data); | |
235 | if (err < 0) | |
236 | return err; | |
237 | ||
238 | data &= ~mask; | |
239 | data |= (val << shift) & mask; | |
240 | return sx150x_i2c_write(chip->client, reg, data); | |
241 | } | |
242 | ||
243 | static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset) | |
244 | { | |
245 | u8 reg = chip->dev_cfg->reg_data; | |
246 | u8 mask; | |
247 | u8 data; | |
248 | u8 shift; | |
249 | s32 err; | |
250 | ||
251 | sx150x_find_cfg(offset, 1, ®, &mask, &shift); | |
252 | err = sx150x_i2c_read(chip->client, reg, &data); | |
253 | if (err >= 0) | |
254 | err = (data & mask) != 0 ? 1 : 0; | |
255 | ||
256 | return err; | |
257 | } | |
258 | ||
259 | static void sx150x_set_oscio(struct sx150x_chip *chip, int val) | |
260 | { | |
261 | sx150x_i2c_write(chip->client, | |
ae9ca493 | 262 | chip->dev_cfg->pri.x789.reg_clock, |
c34f16b7 GB |
263 | (val ? 0x1f : 0x10)); |
264 | } | |
265 | ||
266 | static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val) | |
267 | { | |
268 | sx150x_write_cfg(chip, | |
269 | offset, | |
270 | 1, | |
271 | chip->dev_cfg->reg_data, | |
272 | (val ? 1 : 0)); | |
273 | } | |
274 | ||
275 | static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset) | |
276 | { | |
277 | return sx150x_write_cfg(chip, | |
278 | offset, | |
279 | 1, | |
280 | chip->dev_cfg->reg_dir, | |
281 | 1); | |
282 | } | |
283 | ||
284 | static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val) | |
285 | { | |
286 | int err; | |
287 | ||
288 | err = sx150x_write_cfg(chip, | |
289 | offset, | |
290 | 1, | |
291 | chip->dev_cfg->reg_data, | |
292 | (val ? 1 : 0)); | |
293 | if (err >= 0) | |
294 | err = sx150x_write_cfg(chip, | |
295 | offset, | |
296 | 1, | |
297 | chip->dev_cfg->reg_dir, | |
298 | 0); | |
299 | return err; | |
300 | } | |
301 | ||
302 | static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset) | |
303 | { | |
218f1f8b | 304 | struct sx150x_chip *chip = to_sx150x(gc); |
c34f16b7 GB |
305 | int status = -EINVAL; |
306 | ||
c34f16b7 GB |
307 | if (!offset_is_oscio(chip, offset)) { |
308 | mutex_lock(&chip->lock); | |
309 | status = sx150x_get_io(chip, offset); | |
310 | mutex_unlock(&chip->lock); | |
311 | } | |
312 | ||
313 | return status; | |
314 | } | |
315 | ||
316 | static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val) | |
317 | { | |
218f1f8b | 318 | struct sx150x_chip *chip = to_sx150x(gc); |
c34f16b7 GB |
319 | |
320 | mutex_lock(&chip->lock); | |
321 | if (offset_is_oscio(chip, offset)) | |
322 | sx150x_set_oscio(chip, val); | |
323 | else | |
324 | sx150x_set_io(chip, offset, val); | |
325 | mutex_unlock(&chip->lock); | |
326 | } | |
327 | ||
328 | static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset) | |
329 | { | |
218f1f8b | 330 | struct sx150x_chip *chip = to_sx150x(gc); |
c34f16b7 GB |
331 | int status = -EINVAL; |
332 | ||
c34f16b7 GB |
333 | if (!offset_is_oscio(chip, offset)) { |
334 | mutex_lock(&chip->lock); | |
335 | status = sx150x_io_input(chip, offset); | |
336 | mutex_unlock(&chip->lock); | |
337 | } | |
338 | return status; | |
339 | } | |
340 | ||
341 | static int sx150x_gpio_direction_output(struct gpio_chip *gc, | |
342 | unsigned offset, | |
343 | int val) | |
344 | { | |
218f1f8b | 345 | struct sx150x_chip *chip = to_sx150x(gc); |
c34f16b7 GB |
346 | int status = 0; |
347 | ||
c34f16b7 GB |
348 | if (!offset_is_oscio(chip, offset)) { |
349 | mutex_lock(&chip->lock); | |
350 | status = sx150x_io_output(chip, offset, val); | |
351 | mutex_unlock(&chip->lock); | |
352 | } | |
353 | return status; | |
354 | } | |
355 | ||
673860c1 | 356 | static void sx150x_irq_mask(struct irq_data *d) |
c34f16b7 | 357 | { |
218f1f8b | 358 | struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d)); |
093e9435 | 359 | unsigned n = d->hwirq; |
c34f16b7 | 360 | |
0ff56cd8 TG |
361 | chip->irq_masked |= (1 << n); |
362 | chip->irq_update = n; | |
c34f16b7 GB |
363 | } |
364 | ||
673860c1 | 365 | static void sx150x_irq_unmask(struct irq_data *d) |
c34f16b7 | 366 | { |
218f1f8b | 367 | struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d)); |
093e9435 | 368 | unsigned n = d->hwirq; |
c34f16b7 | 369 | |
0ff56cd8 TG |
370 | chip->irq_masked &= ~(1 << n); |
371 | chip->irq_update = n; | |
c34f16b7 GB |
372 | } |
373 | ||
673860c1 | 374 | static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type) |
c34f16b7 | 375 | { |
218f1f8b | 376 | struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d)); |
c34f16b7 GB |
377 | unsigned n, val = 0; |
378 | ||
379 | if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) | |
380 | return -EINVAL; | |
381 | ||
093e9435 | 382 | n = d->hwirq; |
c34f16b7 GB |
383 | |
384 | if (flow_type & IRQ_TYPE_EDGE_RISING) | |
385 | val |= 0x1; | |
386 | if (flow_type & IRQ_TYPE_EDGE_FALLING) | |
387 | val |= 0x2; | |
388 | ||
389 | chip->irq_sense &= ~(3UL << (n * 2)); | |
390 | chip->irq_sense |= val << (n * 2); | |
0ff56cd8 | 391 | chip->irq_update = n; |
c34f16b7 GB |
392 | return 0; |
393 | } | |
394 | ||
395 | static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id) | |
396 | { | |
397 | struct sx150x_chip *chip = (struct sx150x_chip *)dev_id; | |
398 | unsigned nhandled = 0; | |
399 | unsigned sub_irq; | |
400 | unsigned n; | |
401 | s32 err; | |
402 | u8 val; | |
403 | int i; | |
404 | ||
405 | for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) { | |
406 | err = sx150x_i2c_read(chip->client, | |
407 | chip->dev_cfg->reg_irq_src - i, | |
408 | &val); | |
409 | if (err < 0) | |
410 | continue; | |
411 | ||
412 | sx150x_i2c_write(chip->client, | |
413 | chip->dev_cfg->reg_irq_src - i, | |
414 | val); | |
415 | for (n = 0; n < 8; ++n) { | |
416 | if (val & (1 << n)) { | |
093e9435 WC |
417 | sub_irq = irq_find_mapping( |
418 | chip->gpio_chip.irqdomain, | |
419 | (i * 8) + n); | |
c34f16b7 GB |
420 | handle_nested_irq(sub_irq); |
421 | ++nhandled; | |
422 | } | |
423 | } | |
424 | } | |
425 | ||
426 | return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE); | |
427 | } | |
428 | ||
673860c1 | 429 | static void sx150x_irq_bus_lock(struct irq_data *d) |
c34f16b7 | 430 | { |
218f1f8b | 431 | struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d)); |
c34f16b7 GB |
432 | |
433 | mutex_lock(&chip->lock); | |
434 | } | |
435 | ||
673860c1 | 436 | static void sx150x_irq_bus_sync_unlock(struct irq_data *d) |
c34f16b7 | 437 | { |
218f1f8b | 438 | struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d)); |
c34f16b7 GB |
439 | unsigned n; |
440 | ||
0ff56cd8 TG |
441 | if (chip->irq_update == NO_UPDATE_PENDING) |
442 | goto out; | |
443 | ||
444 | n = chip->irq_update; | |
445 | chip->irq_update = NO_UPDATE_PENDING; | |
c34f16b7 | 446 | |
0ff56cd8 TG |
447 | /* Avoid updates if nothing changed */ |
448 | if (chip->dev_sense == chip->irq_sense && | |
aab0b129 | 449 | chip->dev_masked == chip->irq_masked) |
0ff56cd8 TG |
450 | goto out; |
451 | ||
452 | chip->dev_sense = chip->irq_sense; | |
453 | chip->dev_masked = chip->irq_masked; | |
454 | ||
455 | if (chip->irq_masked & (1 << n)) { | |
456 | sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1); | |
457 | sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0); | |
458 | } else { | |
459 | sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0); | |
460 | sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, | |
461 | chip->irq_sense >> (n * 2)); | |
462 | } | |
463 | out: | |
c34f16b7 GB |
464 | mutex_unlock(&chip->lock); |
465 | } | |
466 | ||
467 | static void sx150x_init_chip(struct sx150x_chip *chip, | |
468 | struct i2c_client *client, | |
469 | kernel_ulong_t driver_data, | |
470 | struct sx150x_platform_data *pdata) | |
471 | { | |
472 | mutex_init(&chip->lock); | |
473 | ||
474 | chip->client = client; | |
475 | chip->dev_cfg = &sx150x_devices[driver_data]; | |
093e9435 | 476 | chip->gpio_chip.dev = &client->dev; |
c34f16b7 GB |
477 | chip->gpio_chip.label = client->name; |
478 | chip->gpio_chip.direction_input = sx150x_gpio_direction_input; | |
479 | chip->gpio_chip.direction_output = sx150x_gpio_direction_output; | |
480 | chip->gpio_chip.get = sx150x_gpio_get; | |
481 | chip->gpio_chip.set = sx150x_gpio_set; | |
c34f16b7 | 482 | chip->gpio_chip.base = pdata->gpio_base; |
9fb1f39e | 483 | chip->gpio_chip.can_sleep = true; |
c34f16b7 | 484 | chip->gpio_chip.ngpio = chip->dev_cfg->ngpios; |
16858cc5 | 485 | #ifdef CONFIG_OF_GPIO |
04d2264c WC |
486 | chip->gpio_chip.of_node = client->dev.of_node; |
487 | chip->gpio_chip.of_gpio_n_cells = 2; | |
16858cc5 | 488 | #endif |
c34f16b7 GB |
489 | if (pdata->oscio_is_gpo) |
490 | ++chip->gpio_chip.ngpio; | |
491 | ||
673860c1 LB |
492 | chip->irq_chip.name = client->name; |
493 | chip->irq_chip.irq_mask = sx150x_irq_mask; | |
494 | chip->irq_chip.irq_unmask = sx150x_irq_unmask; | |
495 | chip->irq_chip.irq_set_type = sx150x_irq_set_type; | |
496 | chip->irq_chip.irq_bus_lock = sx150x_irq_bus_lock; | |
497 | chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock; | |
498 | chip->irq_summary = -1; | |
499 | chip->irq_base = -1; | |
0ff56cd8 | 500 | chip->irq_masked = ~0; |
673860c1 | 501 | chip->irq_sense = 0; |
0ff56cd8 TG |
502 | chip->dev_masked = ~0; |
503 | chip->dev_sense = 0; | |
504 | chip->irq_update = NO_UPDATE_PENDING; | |
c34f16b7 GB |
505 | } |
506 | ||
507 | static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg) | |
508 | { | |
509 | int err = 0; | |
510 | unsigned n; | |
511 | ||
512 | for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n) | |
513 | err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8)); | |
514 | return err; | |
515 | } | |
516 | ||
5affb607 | 517 | static int sx150x_reset(struct sx150x_chip *chip) |
c34f16b7 | 518 | { |
5affb607 | 519 | int err; |
c34f16b7 | 520 | |
5affb607 | 521 | err = i2c_smbus_write_byte_data(chip->client, |
ae9ca493 | 522 | chip->dev_cfg->pri.x789.reg_reset, |
5affb607 | 523 | 0x12); |
c34f16b7 GB |
524 | if (err < 0) |
525 | return err; | |
526 | ||
5affb607 | 527 | err = i2c_smbus_write_byte_data(chip->client, |
ae9ca493 | 528 | chip->dev_cfg->pri.x789.reg_reset, |
5affb607 GB |
529 | 0x34); |
530 | return err; | |
531 | } | |
532 | ||
533 | static int sx150x_init_hw(struct sx150x_chip *chip, | |
534 | struct sx150x_platform_data *pdata) | |
535 | { | |
536 | int err = 0; | |
537 | ||
538 | if (pdata->reset_during_probe) { | |
539 | err = sx150x_reset(chip); | |
540 | if (err < 0) | |
541 | return err; | |
542 | } | |
543 | ||
ae9ca493 WC |
544 | if (chip->dev_cfg->model == SX150X_789) |
545 | err = sx150x_i2c_write(chip->client, | |
546 | chip->dev_cfg->pri.x789.reg_misc, | |
547 | 0x01); | |
548 | else | |
549 | err = sx150x_i2c_write(chip->client, | |
550 | chip->dev_cfg->pri.x456.reg_advance, | |
551 | 0x04); | |
c34f16b7 GB |
552 | if (err < 0) |
553 | return err; | |
554 | ||
555 | err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup, | |
556 | pdata->io_pullup_ena); | |
557 | if (err < 0) | |
558 | return err; | |
559 | ||
560 | err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn, | |
561 | pdata->io_pulldn_ena); | |
562 | if (err < 0) | |
563 | return err; | |
564 | ||
ae9ca493 WC |
565 | if (chip->dev_cfg->model == SX150X_789) { |
566 | err = sx150x_init_io(chip, | |
567 | chip->dev_cfg->pri.x789.reg_drain, | |
568 | pdata->io_open_drain_ena); | |
569 | if (err < 0) | |
570 | return err; | |
571 | ||
572 | err = sx150x_init_io(chip, | |
573 | chip->dev_cfg->pri.x789.reg_polarity, | |
574 | pdata->io_polarity); | |
575 | if (err < 0) | |
576 | return err; | |
577 | } else { | |
578 | /* Set all pins to work in normal mode */ | |
579 | err = sx150x_init_io(chip, | |
580 | chip->dev_cfg->pri.x456.reg_pld_mode, | |
581 | 0); | |
582 | if (err < 0) | |
583 | return err; | |
584 | } | |
c34f16b7 | 585 | |
c34f16b7 GB |
586 | |
587 | if (pdata->oscio_is_gpo) | |
588 | sx150x_set_oscio(chip, 0); | |
589 | ||
590 | return err; | |
591 | } | |
592 | ||
593 | static int sx150x_install_irq_chip(struct sx150x_chip *chip, | |
594 | int irq_summary, | |
595 | int irq_base) | |
596 | { | |
597 | int err; | |
c34f16b7 GB |
598 | |
599 | chip->irq_summary = irq_summary; | |
600 | chip->irq_base = irq_base; | |
601 | ||
093e9435 WC |
602 | /* Add gpio chip to irq subsystem */ |
603 | err = gpiochip_irqchip_add(&chip->gpio_chip, | |
604 | &chip->irq_chip, chip->irq_base, | |
605 | handle_edge_irq, IRQ_TYPE_EDGE_BOTH); | |
606 | if (err) { | |
607 | dev_err(&chip->client->dev, | |
608 | "could not connect irqchip to gpiochip\n"); | |
609 | return err; | |
c34f16b7 GB |
610 | } |
611 | ||
644c8df2 | 612 | err = devm_request_threaded_irq(&chip->client->dev, |
093e9435 WC |
613 | irq_summary, NULL, sx150x_irq_thread_fn, |
614 | IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_FALLING, | |
615 | chip->irq_chip.name, chip); | |
c34f16b7 GB |
616 | if (err < 0) { |
617 | chip->irq_summary = -1; | |
618 | chip->irq_base = -1; | |
619 | } | |
620 | ||
621 | return err; | |
622 | } | |
623 | ||
3836309d | 624 | static int sx150x_probe(struct i2c_client *client, |
c34f16b7 GB |
625 | const struct i2c_device_id *id) |
626 | { | |
627 | static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA | | |
628 | I2C_FUNC_SMBUS_WRITE_WORD_DATA; | |
629 | struct sx150x_platform_data *pdata; | |
630 | struct sx150x_chip *chip; | |
631 | int rc; | |
632 | ||
e56aee18 | 633 | pdata = dev_get_platdata(&client->dev); |
c34f16b7 GB |
634 | if (!pdata) |
635 | return -EINVAL; | |
636 | ||
637 | if (!i2c_check_functionality(client->adapter, i2c_funcs)) | |
638 | return -ENOSYS; | |
639 | ||
644c8df2 NB |
640 | chip = devm_kzalloc(&client->dev, |
641 | sizeof(struct sx150x_chip), GFP_KERNEL); | |
c34f16b7 GB |
642 | if (!chip) |
643 | return -ENOMEM; | |
644 | ||
645 | sx150x_init_chip(chip, client, id->driver_data, pdata); | |
646 | rc = sx150x_init_hw(chip, pdata); | |
647 | if (rc < 0) | |
644c8df2 | 648 | return rc; |
c34f16b7 GB |
649 | |
650 | rc = gpiochip_add(&chip->gpio_chip); | |
644c8df2 NB |
651 | if (rc) |
652 | return rc; | |
c34f16b7 GB |
653 | |
654 | if (pdata->irq_summary >= 0) { | |
655 | rc = sx150x_install_irq_chip(chip, | |
656 | pdata->irq_summary, | |
657 | pdata->irq_base); | |
658 | if (rc < 0) | |
659 | goto probe_fail_post_gpiochip_add; | |
660 | } | |
661 | ||
662 | i2c_set_clientdata(client, chip); | |
663 | ||
664 | return 0; | |
665 | probe_fail_post_gpiochip_add: | |
9f5132ae | 666 | gpiochip_remove(&chip->gpio_chip); |
c34f16b7 GB |
667 | return rc; |
668 | } | |
669 | ||
206210ce | 670 | static int sx150x_remove(struct i2c_client *client) |
c34f16b7 GB |
671 | { |
672 | struct sx150x_chip *chip; | |
c34f16b7 GB |
673 | |
674 | chip = i2c_get_clientdata(client); | |
9f5132ae | 675 | gpiochip_remove(&chip->gpio_chip); |
c34f16b7 | 676 | |
c34f16b7 GB |
677 | return 0; |
678 | } | |
679 | ||
680 | static struct i2c_driver sx150x_driver = { | |
681 | .driver = { | |
682 | .name = "sx150x", | |
04d2264c | 683 | .owner = THIS_MODULE, |
16858cc5 | 684 | .of_match_table = of_match_ptr(sx150x_of_match), |
c34f16b7 GB |
685 | }, |
686 | .probe = sx150x_probe, | |
8283c4ff | 687 | .remove = sx150x_remove, |
c34f16b7 GB |
688 | .id_table = sx150x_id, |
689 | }; | |
690 | ||
691 | static int __init sx150x_init(void) | |
692 | { | |
693 | return i2c_add_driver(&sx150x_driver); | |
694 | } | |
695 | subsys_initcall(sx150x_init); | |
696 | ||
697 | static void __exit sx150x_exit(void) | |
698 | { | |
699 | return i2c_del_driver(&sx150x_driver); | |
700 | } | |
701 | module_exit(sx150x_exit); | |
702 | ||
703 | MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>"); | |
704 | MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders"); | |
705 | MODULE_LICENSE("GPL v2"); |