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1 | /* MCP23S08 SPI/I2C GPIO driver */ | |
2 | ||
3 | #include <linux/kernel.h> | |
4 | #include <linux/device.h> | |
5 | #include <linux/mutex.h> | |
6 | #include <linux/module.h> | |
7 | #include <linux/gpio.h> | |
8 | #include <linux/i2c.h> | |
9 | #include <linux/spi/spi.h> | |
10 | #include <linux/spi/mcp23s08.h> | |
11 | #include <linux/slab.h> | |
12 | #include <asm/byteorder.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/of_device.h> | |
15 | #include <linux/regmap.h> | |
16 | #include <linux/pinctrl/pinctrl.h> | |
17 | #include <linux/pinctrl/pinconf.h> | |
18 | #include <linux/pinctrl/pinconf-generic.h> | |
19 | ||
20 | /* | |
21 | * MCP types supported by driver | |
22 | */ | |
23 | #define MCP_TYPE_S08 0 | |
24 | #define MCP_TYPE_S17 1 | |
25 | #define MCP_TYPE_008 2 | |
26 | #define MCP_TYPE_017 3 | |
27 | #define MCP_TYPE_S18 4 | |
28 | ||
29 | #define MCP_MAX_DEV_PER_CS 8 | |
30 | ||
31 | /* Registers are all 8 bits wide. | |
32 | * | |
33 | * The mcp23s17 has twice as many bits, and can be configured to work | |
34 | * with either 16 bit registers or with two adjacent 8 bit banks. | |
35 | */ | |
36 | #define MCP_IODIR 0x00 /* init/reset: all ones */ | |
37 | #define MCP_IPOL 0x01 | |
38 | #define MCP_GPINTEN 0x02 | |
39 | #define MCP_DEFVAL 0x03 | |
40 | #define MCP_INTCON 0x04 | |
41 | #define MCP_IOCON 0x05 | |
42 | # define IOCON_MIRROR (1 << 6) | |
43 | # define IOCON_SEQOP (1 << 5) | |
44 | # define IOCON_HAEN (1 << 3) | |
45 | # define IOCON_ODR (1 << 2) | |
46 | # define IOCON_INTPOL (1 << 1) | |
47 | # define IOCON_INTCC (1) | |
48 | #define MCP_GPPU 0x06 | |
49 | #define MCP_INTF 0x07 | |
50 | #define MCP_INTCAP 0x08 | |
51 | #define MCP_GPIO 0x09 | |
52 | #define MCP_OLAT 0x0a | |
53 | ||
54 | struct mcp23s08; | |
55 | ||
56 | struct mcp23s08 { | |
57 | u8 addr; | |
58 | bool irq_active_high; | |
59 | bool reg_shift; | |
60 | ||
61 | u16 irq_rise; | |
62 | u16 irq_fall; | |
63 | int irq; | |
64 | bool irq_controller; | |
65 | int cached_gpio; | |
66 | /* lock protects regmap access with bypass/cache flags */ | |
67 | struct mutex lock; | |
68 | ||
69 | struct gpio_chip chip; | |
70 | ||
71 | struct regmap *regmap; | |
72 | struct device *dev; | |
73 | ||
74 | struct pinctrl_dev *pctldev; | |
75 | struct pinctrl_desc pinctrl_desc; | |
76 | }; | |
77 | ||
78 | static const struct reg_default mcp23x08_defaults[] = { | |
79 | {.reg = MCP_IODIR, .def = 0xff}, | |
80 | {.reg = MCP_IPOL, .def = 0x00}, | |
81 | {.reg = MCP_GPINTEN, .def = 0x00}, | |
82 | {.reg = MCP_DEFVAL, .def = 0x00}, | |
83 | {.reg = MCP_INTCON, .def = 0x00}, | |
84 | {.reg = MCP_IOCON, .def = 0x00}, | |
85 | {.reg = MCP_GPPU, .def = 0x00}, | |
86 | {.reg = MCP_OLAT, .def = 0x00}, | |
87 | }; | |
88 | ||
89 | static const struct regmap_range mcp23x08_volatile_range = { | |
90 | .range_min = MCP_INTF, | |
91 | .range_max = MCP_GPIO, | |
92 | }; | |
93 | ||
94 | static const struct regmap_access_table mcp23x08_volatile_table = { | |
95 | .yes_ranges = &mcp23x08_volatile_range, | |
96 | .n_yes_ranges = 1, | |
97 | }; | |
98 | ||
99 | static const struct regmap_range mcp23x08_precious_range = { | |
100 | .range_min = MCP_GPIO, | |
101 | .range_max = MCP_GPIO, | |
102 | }; | |
103 | ||
104 | static const struct regmap_access_table mcp23x08_precious_table = { | |
105 | .yes_ranges = &mcp23x08_precious_range, | |
106 | .n_yes_ranges = 1, | |
107 | }; | |
108 | ||
109 | static const struct regmap_config mcp23x08_regmap = { | |
110 | .reg_bits = 8, | |
111 | .val_bits = 8, | |
112 | ||
113 | .reg_stride = 1, | |
114 | .volatile_table = &mcp23x08_volatile_table, | |
115 | .precious_table = &mcp23x08_precious_table, | |
116 | .reg_defaults = mcp23x08_defaults, | |
117 | .num_reg_defaults = ARRAY_SIZE(mcp23x08_defaults), | |
118 | .cache_type = REGCACHE_FLAT, | |
119 | .max_register = MCP_OLAT, | |
120 | }; | |
121 | ||
122 | static const struct reg_default mcp23x16_defaults[] = { | |
123 | {.reg = MCP_IODIR << 1, .def = 0xffff}, | |
124 | {.reg = MCP_IPOL << 1, .def = 0x0000}, | |
125 | {.reg = MCP_GPINTEN << 1, .def = 0x0000}, | |
126 | {.reg = MCP_DEFVAL << 1, .def = 0x0000}, | |
127 | {.reg = MCP_INTCON << 1, .def = 0x0000}, | |
128 | {.reg = MCP_IOCON << 1, .def = 0x0000}, | |
129 | {.reg = MCP_GPPU << 1, .def = 0x0000}, | |
130 | {.reg = MCP_OLAT << 1, .def = 0x0000}, | |
131 | }; | |
132 | ||
133 | static const struct regmap_range mcp23x16_volatile_range = { | |
134 | .range_min = MCP_INTF << 1, | |
135 | .range_max = MCP_GPIO << 1, | |
136 | }; | |
137 | ||
138 | static const struct regmap_access_table mcp23x16_volatile_table = { | |
139 | .yes_ranges = &mcp23x16_volatile_range, | |
140 | .n_yes_ranges = 1, | |
141 | }; | |
142 | ||
143 | static const struct regmap_range mcp23x16_precious_range = { | |
144 | .range_min = MCP_GPIO << 1, | |
145 | .range_max = MCP_GPIO << 1, | |
146 | }; | |
147 | ||
148 | static const struct regmap_access_table mcp23x16_precious_table = { | |
149 | .yes_ranges = &mcp23x16_precious_range, | |
150 | .n_yes_ranges = 1, | |
151 | }; | |
152 | ||
153 | static const struct regmap_config mcp23x17_regmap = { | |
154 | .reg_bits = 8, | |
155 | .val_bits = 16, | |
156 | ||
157 | .reg_stride = 2, | |
158 | .max_register = MCP_OLAT << 1, | |
159 | .volatile_table = &mcp23x16_volatile_table, | |
160 | .precious_table = &mcp23x16_precious_table, | |
161 | .reg_defaults = mcp23x16_defaults, | |
162 | .num_reg_defaults = ARRAY_SIZE(mcp23x16_defaults), | |
163 | .cache_type = REGCACHE_FLAT, | |
164 | .val_format_endian = REGMAP_ENDIAN_LITTLE, | |
165 | }; | |
166 | ||
167 | static int mcp_read(struct mcp23s08 *mcp, unsigned int reg, unsigned int *val) | |
168 | { | |
169 | return regmap_read(mcp->regmap, reg << mcp->reg_shift, val); | |
170 | } | |
171 | ||
172 | static int mcp_write(struct mcp23s08 *mcp, unsigned int reg, unsigned int val) | |
173 | { | |
174 | return regmap_write(mcp->regmap, reg << mcp->reg_shift, val); | |
175 | } | |
176 | ||
177 | static int mcp_set_mask(struct mcp23s08 *mcp, unsigned int reg, | |
178 | unsigned int mask, bool enabled) | |
179 | { | |
180 | u16 val = enabled ? 0xffff : 0x0000; | |
181 | return regmap_update_bits(mcp->regmap, reg << mcp->reg_shift, | |
182 | mask, val); | |
183 | } | |
184 | ||
185 | static int mcp_set_bit(struct mcp23s08 *mcp, unsigned int reg, | |
186 | unsigned int pin, bool enabled) | |
187 | { | |
188 | u16 mask = BIT(pin); | |
189 | return mcp_set_mask(mcp, reg, mask, enabled); | |
190 | } | |
191 | ||
192 | static const struct pinctrl_pin_desc mcp23x08_pins[] = { | |
193 | PINCTRL_PIN(0, "gpio0"), | |
194 | PINCTRL_PIN(1, "gpio1"), | |
195 | PINCTRL_PIN(2, "gpio2"), | |
196 | PINCTRL_PIN(3, "gpio3"), | |
197 | PINCTRL_PIN(4, "gpio4"), | |
198 | PINCTRL_PIN(5, "gpio5"), | |
199 | PINCTRL_PIN(6, "gpio6"), | |
200 | PINCTRL_PIN(7, "gpio7"), | |
201 | }; | |
202 | ||
203 | static const struct pinctrl_pin_desc mcp23x17_pins[] = { | |
204 | PINCTRL_PIN(0, "gpio0"), | |
205 | PINCTRL_PIN(1, "gpio1"), | |
206 | PINCTRL_PIN(2, "gpio2"), | |
207 | PINCTRL_PIN(3, "gpio3"), | |
208 | PINCTRL_PIN(4, "gpio4"), | |
209 | PINCTRL_PIN(5, "gpio5"), | |
210 | PINCTRL_PIN(6, "gpio6"), | |
211 | PINCTRL_PIN(7, "gpio7"), | |
212 | PINCTRL_PIN(8, "gpio8"), | |
213 | PINCTRL_PIN(9, "gpio9"), | |
214 | PINCTRL_PIN(10, "gpio10"), | |
215 | PINCTRL_PIN(11, "gpio11"), | |
216 | PINCTRL_PIN(12, "gpio12"), | |
217 | PINCTRL_PIN(13, "gpio13"), | |
218 | PINCTRL_PIN(14, "gpio14"), | |
219 | PINCTRL_PIN(15, "gpio15"), | |
220 | }; | |
221 | ||
222 | static int mcp_pinctrl_get_groups_count(struct pinctrl_dev *pctldev) | |
223 | { | |
224 | return 0; | |
225 | } | |
226 | ||
227 | static const char *mcp_pinctrl_get_group_name(struct pinctrl_dev *pctldev, | |
228 | unsigned int group) | |
229 | { | |
230 | return NULL; | |
231 | } | |
232 | ||
233 | static int mcp_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, | |
234 | unsigned int group, | |
235 | const unsigned int **pins, | |
236 | unsigned int *num_pins) | |
237 | { | |
238 | return -ENOTSUPP; | |
239 | } | |
240 | ||
241 | static const struct pinctrl_ops mcp_pinctrl_ops = { | |
242 | .get_groups_count = mcp_pinctrl_get_groups_count, | |
243 | .get_group_name = mcp_pinctrl_get_group_name, | |
244 | .get_group_pins = mcp_pinctrl_get_group_pins, | |
245 | #ifdef CONFIG_OF | |
246 | .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, | |
247 | .dt_free_map = pinconf_generic_dt_free_map, | |
248 | #endif | |
249 | }; | |
250 | ||
251 | static int mcp_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, | |
252 | unsigned long *config) | |
253 | { | |
254 | struct mcp23s08 *mcp = pinctrl_dev_get_drvdata(pctldev); | |
255 | enum pin_config_param param = pinconf_to_config_param(*config); | |
256 | unsigned int data, status; | |
257 | int ret; | |
258 | ||
259 | switch (param) { | |
260 | case PIN_CONFIG_BIAS_PULL_UP: | |
261 | ret = mcp_read(mcp, MCP_GPPU, &data); | |
262 | if (ret < 0) | |
263 | return ret; | |
264 | status = (data & BIT(pin)) ? 1 : 0; | |
265 | break; | |
266 | default: | |
267 | dev_err(mcp->dev, "Invalid config param %04x\n", param); | |
268 | return -ENOTSUPP; | |
269 | } | |
270 | ||
271 | *config = 0; | |
272 | ||
273 | return status ? 0 : -EINVAL; | |
274 | } | |
275 | ||
276 | static int mcp_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, | |
277 | unsigned long *configs, unsigned int num_configs) | |
278 | { | |
279 | struct mcp23s08 *mcp = pinctrl_dev_get_drvdata(pctldev); | |
280 | enum pin_config_param param; | |
281 | u32 arg, mask; | |
282 | u16 val; | |
283 | int ret = 0; | |
284 | int i; | |
285 | ||
286 | for (i = 0; i < num_configs; i++) { | |
287 | param = pinconf_to_config_param(configs[i]); | |
288 | arg = pinconf_to_config_argument(configs[i]); | |
289 | ||
290 | switch (param) { | |
291 | case PIN_CONFIG_BIAS_PULL_UP: | |
292 | val = arg ? 0xFFFF : 0x0000; | |
293 | mask = BIT(pin); | |
294 | ret = mcp_set_bit(mcp, MCP_GPPU, pin, arg); | |
295 | break; | |
296 | default: | |
297 | dev_err(mcp->dev, "Invalid config param %04x\n", param); | |
298 | return -ENOTSUPP; | |
299 | } | |
300 | } | |
301 | ||
302 | return ret; | |
303 | } | |
304 | ||
305 | static const struct pinconf_ops mcp_pinconf_ops = { | |
306 | .pin_config_get = mcp_pinconf_get, | |
307 | .pin_config_set = mcp_pinconf_set, | |
308 | .is_generic = true, | |
309 | }; | |
310 | ||
311 | /*----------------------------------------------------------------------*/ | |
312 | ||
313 | #ifdef CONFIG_SPI_MASTER | |
314 | ||
315 | static int mcp23sxx_spi_write(void *context, const void *data, size_t count) | |
316 | { | |
317 | struct mcp23s08 *mcp = context; | |
318 | struct spi_device *spi = to_spi_device(mcp->dev); | |
319 | struct spi_message m; | |
320 | struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, }, | |
321 | { .tx_buf = data, .len = count, }, }; | |
322 | ||
323 | spi_message_init(&m); | |
324 | spi_message_add_tail(&t[0], &m); | |
325 | spi_message_add_tail(&t[1], &m); | |
326 | ||
327 | return spi_sync(spi, &m); | |
328 | } | |
329 | ||
330 | static int mcp23sxx_spi_gather_write(void *context, | |
331 | const void *reg, size_t reg_size, | |
332 | const void *val, size_t val_size) | |
333 | { | |
334 | struct mcp23s08 *mcp = context; | |
335 | struct spi_device *spi = to_spi_device(mcp->dev); | |
336 | struct spi_message m; | |
337 | struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, }, | |
338 | { .tx_buf = reg, .len = reg_size, }, | |
339 | { .tx_buf = val, .len = val_size, }, }; | |
340 | ||
341 | spi_message_init(&m); | |
342 | spi_message_add_tail(&t[0], &m); | |
343 | spi_message_add_tail(&t[1], &m); | |
344 | spi_message_add_tail(&t[2], &m); | |
345 | ||
346 | return spi_sync(spi, &m); | |
347 | } | |
348 | ||
349 | static int mcp23sxx_spi_read(void *context, const void *reg, size_t reg_size, | |
350 | void *val, size_t val_size) | |
351 | { | |
352 | struct mcp23s08 *mcp = context; | |
353 | struct spi_device *spi = to_spi_device(mcp->dev); | |
354 | u8 tx[2]; | |
355 | ||
356 | if (reg_size != 1) | |
357 | return -EINVAL; | |
358 | ||
359 | tx[0] = mcp->addr | 0x01; | |
360 | tx[1] = *((u8 *) reg); | |
361 | ||
362 | return spi_write_then_read(spi, tx, sizeof(tx), val, val_size); | |
363 | } | |
364 | ||
365 | static const struct regmap_bus mcp23sxx_spi_regmap = { | |
366 | .write = mcp23sxx_spi_write, | |
367 | .gather_write = mcp23sxx_spi_gather_write, | |
368 | .read = mcp23sxx_spi_read, | |
369 | }; | |
370 | ||
371 | #endif /* CONFIG_SPI_MASTER */ | |
372 | ||
373 | /*----------------------------------------------------------------------*/ | |
374 | ||
375 | /* A given spi_device can represent up to eight mcp23sxx chips | |
376 | * sharing the same chipselect but using different addresses | |
377 | * (e.g. chips #0 and #3 might be populated, but not #1 or $2). | |
378 | * Driver data holds all the per-chip data. | |
379 | */ | |
380 | struct mcp23s08_driver_data { | |
381 | unsigned ngpio; | |
382 | struct mcp23s08 *mcp[8]; | |
383 | struct mcp23s08 chip[]; | |
384 | }; | |
385 | ||
386 | ||
387 | static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset) | |
388 | { | |
389 | struct mcp23s08 *mcp = gpiochip_get_data(chip); | |
390 | int status; | |
391 | ||
392 | mutex_lock(&mcp->lock); | |
393 | status = mcp_set_bit(mcp, MCP_IODIR, offset, true); | |
394 | mutex_unlock(&mcp->lock); | |
395 | ||
396 | return status; | |
397 | } | |
398 | ||
399 | static int mcp23s08_get(struct gpio_chip *chip, unsigned offset) | |
400 | { | |
401 | struct mcp23s08 *mcp = gpiochip_get_data(chip); | |
402 | int status, ret; | |
403 | ||
404 | mutex_lock(&mcp->lock); | |
405 | ||
406 | /* REVISIT reading this clears any IRQ ... */ | |
407 | ret = mcp_read(mcp, MCP_GPIO, &status); | |
408 | if (ret < 0) | |
409 | status = 0; | |
410 | else | |
411 | status = !!(status & (1 << offset)); | |
412 | ||
413 | mcp->cached_gpio = status; | |
414 | ||
415 | mutex_unlock(&mcp->lock); | |
416 | return status; | |
417 | } | |
418 | ||
419 | static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, bool value) | |
420 | { | |
421 | return mcp_set_mask(mcp, MCP_OLAT, mask, value); | |
422 | } | |
423 | ||
424 | static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value) | |
425 | { | |
426 | struct mcp23s08 *mcp = gpiochip_get_data(chip); | |
427 | unsigned mask = BIT(offset); | |
428 | ||
429 | mutex_lock(&mcp->lock); | |
430 | __mcp23s08_set(mcp, mask, !!value); | |
431 | mutex_unlock(&mcp->lock); | |
432 | } | |
433 | ||
434 | static int | |
435 | mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value) | |
436 | { | |
437 | struct mcp23s08 *mcp = gpiochip_get_data(chip); | |
438 | unsigned mask = BIT(offset); | |
439 | int status; | |
440 | ||
441 | mutex_lock(&mcp->lock); | |
442 | status = __mcp23s08_set(mcp, mask, value); | |
443 | if (status == 0) { | |
444 | status = mcp_set_mask(mcp, MCP_IODIR, mask, false); | |
445 | } | |
446 | mutex_unlock(&mcp->lock); | |
447 | return status; | |
448 | } | |
449 | ||
450 | /*----------------------------------------------------------------------*/ | |
451 | static irqreturn_t mcp23s08_irq(int irq, void *data) | |
452 | { | |
453 | struct mcp23s08 *mcp = data; | |
454 | int intcap, intcon, intf, i, gpio, gpio_orig, intcap_mask, defval; | |
455 | unsigned int child_irq; | |
456 | bool intf_set, intcap_changed, gpio_bit_changed, | |
457 | defval_changed, gpio_set; | |
458 | ||
459 | mutex_lock(&mcp->lock); | |
460 | if (mcp_read(mcp, MCP_INTF, &intf) < 0) { | |
461 | mutex_unlock(&mcp->lock); | |
462 | return IRQ_HANDLED; | |
463 | } | |
464 | ||
465 | if (mcp_read(mcp, MCP_INTCAP, &intcap) < 0) { | |
466 | mutex_unlock(&mcp->lock); | |
467 | return IRQ_HANDLED; | |
468 | } | |
469 | ||
470 | if (mcp_read(mcp, MCP_INTCON, &intcon) < 0) { | |
471 | mutex_unlock(&mcp->lock); | |
472 | return IRQ_HANDLED; | |
473 | } | |
474 | ||
475 | if (mcp_read(mcp, MCP_DEFVAL, &defval) < 0) { | |
476 | mutex_unlock(&mcp->lock); | |
477 | return IRQ_HANDLED; | |
478 | } | |
479 | ||
480 | /* This clears the interrupt(configurable on S18) */ | |
481 | if (mcp_read(mcp, MCP_GPIO, &gpio) < 0) { | |
482 | mutex_unlock(&mcp->lock); | |
483 | return IRQ_HANDLED; | |
484 | } | |
485 | gpio_orig = mcp->cached_gpio; | |
486 | mcp->cached_gpio = gpio; | |
487 | mutex_unlock(&mcp->lock); | |
488 | ||
489 | if (intf == 0) { | |
490 | /* There is no interrupt pending */ | |
491 | return IRQ_HANDLED; | |
492 | } | |
493 | ||
494 | dev_dbg(mcp->chip.parent, | |
495 | "intcap 0x%04X intf 0x%04X gpio_orig 0x%04X gpio 0x%04X\n", | |
496 | intcap, intf, gpio_orig, gpio); | |
497 | ||
498 | for (i = 0; i < mcp->chip.ngpio; i++) { | |
499 | /* We must check all of the inputs on the chip, | |
500 | * otherwise we may not notice a change on >=2 pins. | |
501 | * | |
502 | * On at least the mcp23s17, INTCAP is only updated | |
503 | * one byte at a time(INTCAPA and INTCAPB are | |
504 | * not written to at the same time - only on a per-bank | |
505 | * basis). | |
506 | * | |
507 | * INTF only contains the single bit that caused the | |
508 | * interrupt per-bank. On the mcp23s17, there is | |
509 | * INTFA and INTFB. If two pins are changed on the A | |
510 | * side at the same time, INTF will only have one bit | |
511 | * set. If one pin on the A side and one pin on the B | |
512 | * side are changed at the same time, INTF will have | |
513 | * two bits set. Thus, INTF can't be the only check | |
514 | * to see if the input has changed. | |
515 | */ | |
516 | ||
517 | intf_set = intf & BIT(i); | |
518 | if (i < 8 && intf_set) | |
519 | intcap_mask = 0x00FF; | |
520 | else if (i >= 8 && intf_set) | |
521 | intcap_mask = 0xFF00; | |
522 | else | |
523 | intcap_mask = 0x00; | |
524 | ||
525 | intcap_changed = (intcap_mask & | |
526 | (intcap & BIT(i))) != | |
527 | (intcap_mask & (BIT(i) & gpio_orig)); | |
528 | gpio_set = BIT(i) & gpio; | |
529 | gpio_bit_changed = (BIT(i) & gpio_orig) != | |
530 | (BIT(i) & gpio); | |
531 | defval_changed = (BIT(i) & intcon) && | |
532 | ((BIT(i) & gpio) != | |
533 | (BIT(i) & defval)); | |
534 | ||
535 | if (((gpio_bit_changed || intcap_changed) && | |
536 | (BIT(i) & mcp->irq_rise) && gpio_set) || | |
537 | ((gpio_bit_changed || intcap_changed) && | |
538 | (BIT(i) & mcp->irq_fall) && !gpio_set) || | |
539 | defval_changed) { | |
540 | child_irq = irq_find_mapping(mcp->chip.irqdomain, i); | |
541 | handle_nested_irq(child_irq); | |
542 | } | |
543 | } | |
544 | ||
545 | return IRQ_HANDLED; | |
546 | } | |
547 | ||
548 | static void mcp23s08_irq_mask(struct irq_data *data) | |
549 | { | |
550 | struct gpio_chip *gc = irq_data_get_irq_chip_data(data); | |
551 | struct mcp23s08 *mcp = gpiochip_get_data(gc); | |
552 | unsigned int pos = data->hwirq; | |
553 | ||
554 | mcp_set_bit(mcp, MCP_GPINTEN, pos, false); | |
555 | } | |
556 | ||
557 | static void mcp23s08_irq_unmask(struct irq_data *data) | |
558 | { | |
559 | struct gpio_chip *gc = irq_data_get_irq_chip_data(data); | |
560 | struct mcp23s08 *mcp = gpiochip_get_data(gc); | |
561 | unsigned int pos = data->hwirq; | |
562 | ||
563 | mcp_set_bit(mcp, MCP_GPINTEN, pos, true); | |
564 | } | |
565 | ||
566 | static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type) | |
567 | { | |
568 | struct gpio_chip *gc = irq_data_get_irq_chip_data(data); | |
569 | struct mcp23s08 *mcp = gpiochip_get_data(gc); | |
570 | unsigned int pos = data->hwirq; | |
571 | int status = 0; | |
572 | ||
573 | if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) { | |
574 | mcp_set_bit(mcp, MCP_INTCON, pos, false); | |
575 | mcp->irq_rise |= BIT(pos); | |
576 | mcp->irq_fall |= BIT(pos); | |
577 | } else if (type & IRQ_TYPE_EDGE_RISING) { | |
578 | mcp_set_bit(mcp, MCP_INTCON, pos, false); | |
579 | mcp->irq_rise |= BIT(pos); | |
580 | mcp->irq_fall &= ~BIT(pos); | |
581 | } else if (type & IRQ_TYPE_EDGE_FALLING) { | |
582 | mcp_set_bit(mcp, MCP_INTCON, pos, false); | |
583 | mcp->irq_rise &= ~BIT(pos); | |
584 | mcp->irq_fall |= BIT(pos); | |
585 | } else if (type & IRQ_TYPE_LEVEL_HIGH) { | |
586 | mcp_set_bit(mcp, MCP_INTCON, pos, true); | |
587 | mcp_set_bit(mcp, MCP_DEFVAL, pos, false); | |
588 | } else if (type & IRQ_TYPE_LEVEL_LOW) { | |
589 | mcp_set_bit(mcp, MCP_INTCON, pos, true); | |
590 | mcp_set_bit(mcp, MCP_DEFVAL, pos, true); | |
591 | } else | |
592 | return -EINVAL; | |
593 | ||
594 | return status; | |
595 | } | |
596 | ||
597 | static void mcp23s08_irq_bus_lock(struct irq_data *data) | |
598 | { | |
599 | struct gpio_chip *gc = irq_data_get_irq_chip_data(data); | |
600 | struct mcp23s08 *mcp = gpiochip_get_data(gc); | |
601 | ||
602 | mutex_lock(&mcp->lock); | |
603 | regcache_cache_only(mcp->regmap, true); | |
604 | } | |
605 | ||
606 | static void mcp23s08_irq_bus_unlock(struct irq_data *data) | |
607 | { | |
608 | struct gpio_chip *gc = irq_data_get_irq_chip_data(data); | |
609 | struct mcp23s08 *mcp = gpiochip_get_data(gc); | |
610 | ||
611 | regcache_cache_only(mcp->regmap, false); | |
612 | regcache_sync(mcp->regmap); | |
613 | ||
614 | mutex_unlock(&mcp->lock); | |
615 | } | |
616 | ||
617 | static struct irq_chip mcp23s08_irq_chip = { | |
618 | .name = "gpio-mcp23xxx", | |
619 | .irq_mask = mcp23s08_irq_mask, | |
620 | .irq_unmask = mcp23s08_irq_unmask, | |
621 | .irq_set_type = mcp23s08_irq_set_type, | |
622 | .irq_bus_lock = mcp23s08_irq_bus_lock, | |
623 | .irq_bus_sync_unlock = mcp23s08_irq_bus_unlock, | |
624 | }; | |
625 | ||
626 | static int mcp23s08_irq_setup(struct mcp23s08 *mcp) | |
627 | { | |
628 | struct gpio_chip *chip = &mcp->chip; | |
629 | int err; | |
630 | unsigned long irqflags = IRQF_ONESHOT | IRQF_SHARED; | |
631 | ||
632 | if (mcp->irq_active_high) | |
633 | irqflags |= IRQF_TRIGGER_HIGH; | |
634 | else | |
635 | irqflags |= IRQF_TRIGGER_LOW; | |
636 | ||
637 | err = devm_request_threaded_irq(chip->parent, mcp->irq, NULL, | |
638 | mcp23s08_irq, | |
639 | irqflags, dev_name(chip->parent), mcp); | |
640 | if (err != 0) { | |
641 | dev_err(chip->parent, "unable to request IRQ#%d: %d\n", | |
642 | mcp->irq, err); | |
643 | return err; | |
644 | } | |
645 | ||
646 | err = gpiochip_irqchip_add_nested(chip, | |
647 | &mcp23s08_irq_chip, | |
648 | 0, | |
649 | handle_simple_irq, | |
650 | IRQ_TYPE_NONE); | |
651 | if (err) { | |
652 | dev_err(chip->parent, | |
653 | "could not connect irqchip to gpiochip: %d\n", err); | |
654 | return err; | |
655 | } | |
656 | ||
657 | gpiochip_set_nested_irqchip(chip, | |
658 | &mcp23s08_irq_chip, | |
659 | mcp->irq); | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
664 | /*----------------------------------------------------------------------*/ | |
665 | ||
666 | #ifdef CONFIG_DEBUG_FS | |
667 | ||
668 | #include <linux/seq_file.h> | |
669 | ||
670 | /* | |
671 | * This compares the chip's registers with the register | |
672 | * cache and corrects any incorrectly set register. This | |
673 | * can be used to fix state for MCP23xxx, that temporary | |
674 | * lost its power supply. | |
675 | */ | |
676 | #define MCP23S08_CONFIG_REGS 8 | |
677 | static int __check_mcp23s08_reg_cache(struct mcp23s08 *mcp) | |
678 | { | |
679 | int cached[MCP23S08_CONFIG_REGS]; | |
680 | int err = 0, i; | |
681 | ||
682 | /* read cached config registers */ | |
683 | for (i = 0; i < MCP23S08_CONFIG_REGS; i++) { | |
684 | err = mcp_read(mcp, i, &cached[i]); | |
685 | if (err) | |
686 | goto out; | |
687 | } | |
688 | ||
689 | regcache_cache_bypass(mcp->regmap, true); | |
690 | ||
691 | for (i = 0; i < MCP23S08_CONFIG_REGS; i++) { | |
692 | int uncached; | |
693 | err = mcp_read(mcp, i, &uncached); | |
694 | if (err) | |
695 | goto out; | |
696 | ||
697 | if (uncached != cached[i]) { | |
698 | dev_err(mcp->dev, "restoring reg 0x%02x from 0x%04x to 0x%04x (power-loss?)\n", | |
699 | i, uncached, cached[i]); | |
700 | mcp_write(mcp, i, cached[i]); | |
701 | } | |
702 | } | |
703 | ||
704 | out: | |
705 | if (err) | |
706 | dev_err(mcp->dev, "read error: reg=%02x, err=%d", i, err); | |
707 | regcache_cache_bypass(mcp->regmap, false); | |
708 | return err; | |
709 | } | |
710 | ||
711 | /* | |
712 | * This shows more info than the generic gpio dump code: | |
713 | * pullups, deglitching, open drain drive. | |
714 | */ | |
715 | static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip) | |
716 | { | |
717 | struct mcp23s08 *mcp; | |
718 | char bank; | |
719 | int t; | |
720 | unsigned mask; | |
721 | int iodir, gpio, gppu; | |
722 | ||
723 | mcp = gpiochip_get_data(chip); | |
724 | ||
725 | /* NOTE: we only handle one bank for now ... */ | |
726 | bank = '0' + ((mcp->addr >> 1) & 0x7); | |
727 | ||
728 | mutex_lock(&mcp->lock); | |
729 | ||
730 | t = __check_mcp23s08_reg_cache(mcp); | |
731 | if (t) { | |
732 | seq_printf(s, " I/O Error\n"); | |
733 | goto done; | |
734 | } | |
735 | t = mcp_read(mcp, MCP_IODIR, &iodir); | |
736 | if (t) { | |
737 | seq_printf(s, " I/O Error\n"); | |
738 | goto done; | |
739 | } | |
740 | t = mcp_read(mcp, MCP_GPIO, &gpio); | |
741 | if (t) { | |
742 | seq_printf(s, " I/O Error\n"); | |
743 | goto done; | |
744 | } | |
745 | t = mcp_read(mcp, MCP_GPPU, &gppu); | |
746 | if (t) { | |
747 | seq_printf(s, " I/O Error\n"); | |
748 | goto done; | |
749 | } | |
750 | ||
751 | for (t = 0, mask = BIT(0); t < chip->ngpio; t++, mask <<= 1) { | |
752 | const char *label; | |
753 | ||
754 | label = gpiochip_is_requested(chip, t); | |
755 | if (!label) | |
756 | continue; | |
757 | ||
758 | seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s", | |
759 | chip->base + t, bank, t, label, | |
760 | (iodir & mask) ? "in " : "out", | |
761 | (gpio & mask) ? "hi" : "lo", | |
762 | (gppu & mask) ? "up" : " "); | |
763 | /* NOTE: ignoring the irq-related registers */ | |
764 | seq_puts(s, "\n"); | |
765 | } | |
766 | done: | |
767 | mutex_unlock(&mcp->lock); | |
768 | } | |
769 | ||
770 | #else | |
771 | #define mcp23s08_dbg_show NULL | |
772 | #endif | |
773 | ||
774 | /*----------------------------------------------------------------------*/ | |
775 | ||
776 | static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, | |
777 | void *data, unsigned addr, unsigned type, | |
778 | unsigned int base, int cs) | |
779 | { | |
780 | int status, ret; | |
781 | bool mirror = false; | |
782 | ||
783 | mutex_init(&mcp->lock); | |
784 | ||
785 | mcp->dev = dev; | |
786 | mcp->addr = addr; | |
787 | mcp->irq_active_high = false; | |
788 | ||
789 | mcp->chip.direction_input = mcp23s08_direction_input; | |
790 | mcp->chip.get = mcp23s08_get; | |
791 | mcp->chip.direction_output = mcp23s08_direction_output; | |
792 | mcp->chip.set = mcp23s08_set; | |
793 | mcp->chip.dbg_show = mcp23s08_dbg_show; | |
794 | #ifdef CONFIG_OF_GPIO | |
795 | mcp->chip.of_gpio_n_cells = 2; | |
796 | mcp->chip.of_node = dev->of_node; | |
797 | #endif | |
798 | ||
799 | switch (type) { | |
800 | #ifdef CONFIG_SPI_MASTER | |
801 | case MCP_TYPE_S08: | |
802 | mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, | |
803 | &mcp23x08_regmap); | |
804 | mcp->reg_shift = 0; | |
805 | mcp->chip.ngpio = 8; | |
806 | mcp->chip.label = "mcp23s08"; | |
807 | break; | |
808 | ||
809 | case MCP_TYPE_S17: | |
810 | mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, | |
811 | &mcp23x17_regmap); | |
812 | mcp->reg_shift = 1; | |
813 | mcp->chip.ngpio = 16; | |
814 | mcp->chip.label = "mcp23s17"; | |
815 | break; | |
816 | ||
817 | case MCP_TYPE_S18: | |
818 | mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, | |
819 | &mcp23x17_regmap); | |
820 | mcp->reg_shift = 1; | |
821 | mcp->chip.ngpio = 16; | |
822 | mcp->chip.label = "mcp23s18"; | |
823 | break; | |
824 | #endif /* CONFIG_SPI_MASTER */ | |
825 | ||
826 | #if IS_ENABLED(CONFIG_I2C) | |
827 | case MCP_TYPE_008: | |
828 | mcp->regmap = devm_regmap_init_i2c(data, &mcp23x08_regmap); | |
829 | mcp->reg_shift = 0; | |
830 | mcp->chip.ngpio = 8; | |
831 | mcp->chip.label = "mcp23008"; | |
832 | break; | |
833 | ||
834 | case MCP_TYPE_017: | |
835 | mcp->regmap = devm_regmap_init_i2c(data, &mcp23x17_regmap); | |
836 | mcp->reg_shift = 1; | |
837 | mcp->chip.ngpio = 16; | |
838 | mcp->chip.label = "mcp23017"; | |
839 | break; | |
840 | #endif /* CONFIG_I2C */ | |
841 | ||
842 | default: | |
843 | dev_err(dev, "invalid device type (%d)\n", type); | |
844 | return -EINVAL; | |
845 | } | |
846 | ||
847 | if (IS_ERR(mcp->regmap)) | |
848 | return PTR_ERR(mcp->regmap); | |
849 | ||
850 | mcp->chip.base = base; | |
851 | mcp->chip.can_sleep = true; | |
852 | mcp->chip.parent = dev; | |
853 | mcp->chip.owner = THIS_MODULE; | |
854 | ||
855 | /* verify MCP_IOCON.SEQOP = 0, so sequential reads work, | |
856 | * and MCP_IOCON.HAEN = 1, so we work with all chips. | |
857 | */ | |
858 | ||
859 | ret = mcp_read(mcp, MCP_IOCON, &status); | |
860 | if (ret < 0) | |
861 | goto fail; | |
862 | ||
863 | mcp->irq_controller = | |
864 | device_property_read_bool(dev, "interrupt-controller"); | |
865 | if (mcp->irq && mcp->irq_controller) { | |
866 | mcp->irq_active_high = | |
867 | device_property_read_bool(dev, | |
868 | "microchip,irq-active-high"); | |
869 | ||
870 | mirror = device_property_read_bool(dev, "microchip,irq-mirror"); | |
871 | } | |
872 | ||
873 | if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror || | |
874 | mcp->irq_active_high) { | |
875 | /* mcp23s17 has IOCON twice, make sure they are in sync */ | |
876 | status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8)); | |
877 | status |= IOCON_HAEN | (IOCON_HAEN << 8); | |
878 | if (mcp->irq_active_high) | |
879 | status |= IOCON_INTPOL | (IOCON_INTPOL << 8); | |
880 | else | |
881 | status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8)); | |
882 | ||
883 | if (mirror) | |
884 | status |= IOCON_MIRROR | (IOCON_MIRROR << 8); | |
885 | ||
886 | if (type == MCP_TYPE_S18) | |
887 | status |= IOCON_INTCC | (IOCON_INTCC << 8); | |
888 | ||
889 | ret = mcp_write(mcp, MCP_IOCON, status); | |
890 | if (ret < 0) | |
891 | goto fail; | |
892 | } | |
893 | ||
894 | ret = devm_gpiochip_add_data(dev, &mcp->chip, mcp); | |
895 | if (ret < 0) | |
896 | goto fail; | |
897 | ||
898 | if (mcp->irq && mcp->irq_controller) { | |
899 | ret = mcp23s08_irq_setup(mcp); | |
900 | if (ret) | |
901 | goto fail; | |
902 | } | |
903 | ||
904 | mcp->pinctrl_desc.name = "mcp23xxx-pinctrl"; | |
905 | mcp->pinctrl_desc.pctlops = &mcp_pinctrl_ops; | |
906 | mcp->pinctrl_desc.confops = &mcp_pinconf_ops; | |
907 | mcp->pinctrl_desc.npins = mcp->chip.ngpio; | |
908 | if (mcp->pinctrl_desc.npins == 8) | |
909 | mcp->pinctrl_desc.pins = mcp23x08_pins; | |
910 | else if (mcp->pinctrl_desc.npins == 16) | |
911 | mcp->pinctrl_desc.pins = mcp23x17_pins; | |
912 | mcp->pinctrl_desc.owner = THIS_MODULE; | |
913 | ||
914 | mcp->pctldev = devm_pinctrl_register(dev, &mcp->pinctrl_desc, mcp); | |
915 | if (IS_ERR(mcp->pctldev)) { | |
916 | ret = PTR_ERR(mcp->pctldev); | |
917 | goto fail; | |
918 | } | |
919 | ||
920 | fail: | |
921 | if (ret < 0) | |
922 | dev_dbg(dev, "can't setup chip %d, --> %d\n", addr, ret); | |
923 | return ret; | |
924 | } | |
925 | ||
926 | /*----------------------------------------------------------------------*/ | |
927 | ||
928 | #ifdef CONFIG_OF | |
929 | #ifdef CONFIG_SPI_MASTER | |
930 | static const struct of_device_id mcp23s08_spi_of_match[] = { | |
931 | { | |
932 | .compatible = "microchip,mcp23s08", | |
933 | .data = (void *) MCP_TYPE_S08, | |
934 | }, | |
935 | { | |
936 | .compatible = "microchip,mcp23s17", | |
937 | .data = (void *) MCP_TYPE_S17, | |
938 | }, | |
939 | { | |
940 | .compatible = "microchip,mcp23s18", | |
941 | .data = (void *) MCP_TYPE_S18, | |
942 | }, | |
943 | /* NOTE: The use of the mcp prefix is deprecated and will be removed. */ | |
944 | { | |
945 | .compatible = "mcp,mcp23s08", | |
946 | .data = (void *) MCP_TYPE_S08, | |
947 | }, | |
948 | { | |
949 | .compatible = "mcp,mcp23s17", | |
950 | .data = (void *) MCP_TYPE_S17, | |
951 | }, | |
952 | { }, | |
953 | }; | |
954 | MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match); | |
955 | #endif | |
956 | ||
957 | #if IS_ENABLED(CONFIG_I2C) | |
958 | static const struct of_device_id mcp23s08_i2c_of_match[] = { | |
959 | { | |
960 | .compatible = "microchip,mcp23008", | |
961 | .data = (void *) MCP_TYPE_008, | |
962 | }, | |
963 | { | |
964 | .compatible = "microchip,mcp23017", | |
965 | .data = (void *) MCP_TYPE_017, | |
966 | }, | |
967 | /* NOTE: The use of the mcp prefix is deprecated and will be removed. */ | |
968 | { | |
969 | .compatible = "mcp,mcp23008", | |
970 | .data = (void *) MCP_TYPE_008, | |
971 | }, | |
972 | { | |
973 | .compatible = "mcp,mcp23017", | |
974 | .data = (void *) MCP_TYPE_017, | |
975 | }, | |
976 | { }, | |
977 | }; | |
978 | MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match); | |
979 | #endif | |
980 | #endif /* CONFIG_OF */ | |
981 | ||
982 | ||
983 | #if IS_ENABLED(CONFIG_I2C) | |
984 | ||
985 | static int mcp230xx_probe(struct i2c_client *client, | |
986 | const struct i2c_device_id *id) | |
987 | { | |
988 | struct mcp23s08_platform_data *pdata, local_pdata; | |
989 | struct mcp23s08 *mcp; | |
990 | int status; | |
991 | ||
992 | pdata = dev_get_platdata(&client->dev); | |
993 | if (!pdata) { | |
994 | pdata = &local_pdata; | |
995 | pdata->base = -1; | |
996 | } | |
997 | ||
998 | mcp = devm_kzalloc(&client->dev, sizeof(*mcp), GFP_KERNEL); | |
999 | if (!mcp) | |
1000 | return -ENOMEM; | |
1001 | ||
1002 | mcp->irq = client->irq; | |
1003 | status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr, | |
1004 | id->driver_data, pdata->base, 0); | |
1005 | if (status) | |
1006 | return status; | |
1007 | ||
1008 | i2c_set_clientdata(client, mcp); | |
1009 | ||
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | static const struct i2c_device_id mcp230xx_id[] = { | |
1014 | { "mcp23008", MCP_TYPE_008 }, | |
1015 | { "mcp23017", MCP_TYPE_017 }, | |
1016 | { }, | |
1017 | }; | |
1018 | MODULE_DEVICE_TABLE(i2c, mcp230xx_id); | |
1019 | ||
1020 | static struct i2c_driver mcp230xx_driver = { | |
1021 | .driver = { | |
1022 | .name = "mcp230xx", | |
1023 | .of_match_table = of_match_ptr(mcp23s08_i2c_of_match), | |
1024 | }, | |
1025 | .probe = mcp230xx_probe, | |
1026 | .id_table = mcp230xx_id, | |
1027 | }; | |
1028 | ||
1029 | static int __init mcp23s08_i2c_init(void) | |
1030 | { | |
1031 | return i2c_add_driver(&mcp230xx_driver); | |
1032 | } | |
1033 | ||
1034 | static void mcp23s08_i2c_exit(void) | |
1035 | { | |
1036 | i2c_del_driver(&mcp230xx_driver); | |
1037 | } | |
1038 | ||
1039 | #else | |
1040 | ||
1041 | static int __init mcp23s08_i2c_init(void) { return 0; } | |
1042 | static void mcp23s08_i2c_exit(void) { } | |
1043 | ||
1044 | #endif /* CONFIG_I2C */ | |
1045 | ||
1046 | /*----------------------------------------------------------------------*/ | |
1047 | ||
1048 | #ifdef CONFIG_SPI_MASTER | |
1049 | ||
1050 | static int mcp23s08_probe(struct spi_device *spi) | |
1051 | { | |
1052 | struct mcp23s08_platform_data *pdata, local_pdata; | |
1053 | unsigned addr; | |
1054 | int chips = 0; | |
1055 | struct mcp23s08_driver_data *data; | |
1056 | int status, type; | |
1057 | unsigned ngpio = 0; | |
1058 | const struct of_device_id *match; | |
1059 | ||
1060 | match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev); | |
1061 | if (match) | |
1062 | type = (int)(uintptr_t)match->data; | |
1063 | else | |
1064 | type = spi_get_device_id(spi)->driver_data; | |
1065 | ||
1066 | pdata = dev_get_platdata(&spi->dev); | |
1067 | if (!pdata) { | |
1068 | pdata = &local_pdata; | |
1069 | pdata->base = -1; | |
1070 | ||
1071 | status = device_property_read_u32(&spi->dev, | |
1072 | "microchip,spi-present-mask", &pdata->spi_present_mask); | |
1073 | if (status) { | |
1074 | status = device_property_read_u32(&spi->dev, | |
1075 | "mcp,spi-present-mask", | |
1076 | &pdata->spi_present_mask); | |
1077 | ||
1078 | if (status) { | |
1079 | dev_err(&spi->dev, "missing spi-present-mask"); | |
1080 | return -ENODEV; | |
1081 | } | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | if (!pdata->spi_present_mask || pdata->spi_present_mask > 0xff) { | |
1086 | dev_err(&spi->dev, "invalid spi-present-mask"); | |
1087 | return -ENODEV; | |
1088 | } | |
1089 | ||
1090 | for (addr = 0; addr < MCP_MAX_DEV_PER_CS; addr++) { | |
1091 | if (pdata->spi_present_mask & BIT(addr)) | |
1092 | chips++; | |
1093 | } | |
1094 | ||
1095 | if (!chips) | |
1096 | return -ENODEV; | |
1097 | ||
1098 | data = devm_kzalloc(&spi->dev, | |
1099 | sizeof(*data) + chips * sizeof(struct mcp23s08), | |
1100 | GFP_KERNEL); | |
1101 | if (!data) | |
1102 | return -ENOMEM; | |
1103 | ||
1104 | spi_set_drvdata(spi, data); | |
1105 | ||
1106 | for (addr = 0; addr < MCP_MAX_DEV_PER_CS; addr++) { | |
1107 | if (!(pdata->spi_present_mask & BIT(addr))) | |
1108 | continue; | |
1109 | chips--; | |
1110 | data->mcp[addr] = &data->chip[chips]; | |
1111 | data->mcp[addr]->irq = spi->irq; | |
1112 | status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi, | |
1113 | 0x40 | (addr << 1), type, | |
1114 | pdata->base, addr); | |
1115 | if (status < 0) | |
1116 | return status; | |
1117 | ||
1118 | if (pdata->base != -1) | |
1119 | pdata->base += data->mcp[addr]->chip.ngpio; | |
1120 | ngpio += data->mcp[addr]->chip.ngpio; | |
1121 | } | |
1122 | data->ngpio = ngpio; | |
1123 | ||
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static const struct spi_device_id mcp23s08_ids[] = { | |
1128 | { "mcp23s08", MCP_TYPE_S08 }, | |
1129 | { "mcp23s17", MCP_TYPE_S17 }, | |
1130 | { "mcp23s18", MCP_TYPE_S18 }, | |
1131 | { }, | |
1132 | }; | |
1133 | MODULE_DEVICE_TABLE(spi, mcp23s08_ids); | |
1134 | ||
1135 | static struct spi_driver mcp23s08_driver = { | |
1136 | .probe = mcp23s08_probe, | |
1137 | .id_table = mcp23s08_ids, | |
1138 | .driver = { | |
1139 | .name = "mcp23s08", | |
1140 | .of_match_table = of_match_ptr(mcp23s08_spi_of_match), | |
1141 | }, | |
1142 | }; | |
1143 | ||
1144 | static int __init mcp23s08_spi_init(void) | |
1145 | { | |
1146 | return spi_register_driver(&mcp23s08_driver); | |
1147 | } | |
1148 | ||
1149 | static void mcp23s08_spi_exit(void) | |
1150 | { | |
1151 | spi_unregister_driver(&mcp23s08_driver); | |
1152 | } | |
1153 | ||
1154 | #else | |
1155 | ||
1156 | static int __init mcp23s08_spi_init(void) { return 0; } | |
1157 | static void mcp23s08_spi_exit(void) { } | |
1158 | ||
1159 | #endif /* CONFIG_SPI_MASTER */ | |
1160 | ||
1161 | /*----------------------------------------------------------------------*/ | |
1162 | ||
1163 | static int __init mcp23s08_init(void) | |
1164 | { | |
1165 | int ret; | |
1166 | ||
1167 | ret = mcp23s08_spi_init(); | |
1168 | if (ret) | |
1169 | goto spi_fail; | |
1170 | ||
1171 | ret = mcp23s08_i2c_init(); | |
1172 | if (ret) | |
1173 | goto i2c_fail; | |
1174 | ||
1175 | return 0; | |
1176 | ||
1177 | i2c_fail: | |
1178 | mcp23s08_spi_exit(); | |
1179 | spi_fail: | |
1180 | return ret; | |
1181 | } | |
1182 | /* register after spi/i2c postcore initcall and before | |
1183 | * subsys initcalls that may rely on these GPIOs | |
1184 | */ | |
1185 | subsys_initcall(mcp23s08_init); | |
1186 | ||
1187 | static void __exit mcp23s08_exit(void) | |
1188 | { | |
1189 | mcp23s08_spi_exit(); | |
1190 | mcp23s08_i2c_exit(); | |
1191 | } | |
1192 | module_exit(mcp23s08_exit); | |
1193 | ||
1194 | MODULE_LICENSE("GPL"); |