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Commit | Line | Data |
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80884094 MH |
1 | /* |
2 | * GPIO Chip driver for Analog Devices | |
459773ae | 3 | * ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller |
80884094 | 4 | * |
459773ae | 5 | * Copyright 2009-2010 Analog Devices Inc. |
80884094 MH |
6 | * |
7 | * Licensed under the GPL-2 or later. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/kernel.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
80884094 MH |
13 | #include <linux/init.h> |
14 | #include <linux/i2c.h> | |
15 | #include <linux/gpio.h> | |
459773ae MH |
16 | #include <linux/interrupt.h> |
17 | #include <linux/irq.h> | |
80884094 MH |
18 | |
19 | #include <linux/i2c/adp5588.h> | |
20 | ||
459773ae MH |
21 | #define DRV_NAME "adp5588-gpio" |
22 | ||
23 | /* | |
24 | * Early pre 4.0 Silicon required to delay readout by at least 25ms, | |
25 | * since the Event Counter Register updated 25ms after the interrupt | |
26 | * asserted. | |
27 | */ | |
28 | #define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4) | |
80884094 MH |
29 | |
30 | struct adp5588_gpio { | |
31 | struct i2c_client *client; | |
32 | struct gpio_chip gpio_chip; | |
33 | struct mutex lock; /* protect cached dir, dat_out */ | |
459773ae MH |
34 | /* protect serialized access to the interrupt controller bus */ |
35 | struct mutex irq_lock; | |
80884094 | 36 | unsigned gpio_start; |
459773ae | 37 | unsigned irq_base; |
80884094 MH |
38 | uint8_t dat_out[3]; |
39 | uint8_t dir[3]; | |
459773ae MH |
40 | uint8_t int_lvl[3]; |
41 | uint8_t int_en[3]; | |
42 | uint8_t irq_mask[3]; | |
43 | uint8_t irq_stat[3]; | |
80884094 MH |
44 | }; |
45 | ||
46 | static int adp5588_gpio_read(struct i2c_client *client, u8 reg) | |
47 | { | |
48 | int ret = i2c_smbus_read_byte_data(client, reg); | |
49 | ||
50 | if (ret < 0) | |
51 | dev_err(&client->dev, "Read Error\n"); | |
52 | ||
53 | return ret; | |
54 | } | |
55 | ||
56 | static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val) | |
57 | { | |
58 | int ret = i2c_smbus_write_byte_data(client, reg, val); | |
59 | ||
60 | if (ret < 0) | |
61 | dev_err(&client->dev, "Write Error\n"); | |
62 | ||
63 | return ret; | |
64 | } | |
65 | ||
66 | static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off) | |
67 | { | |
68 | struct adp5588_gpio *dev = | |
69 | container_of(chip, struct adp5588_gpio, gpio_chip); | |
70 | ||
459773ae MH |
71 | return !!(adp5588_gpio_read(dev->client, |
72 | GPIO_DAT_STAT1 + ADP5588_BANK(off)) & ADP5588_BIT(off)); | |
80884094 MH |
73 | } |
74 | ||
75 | static void adp5588_gpio_set_value(struct gpio_chip *chip, | |
76 | unsigned off, int val) | |
77 | { | |
78 | unsigned bank, bit; | |
79 | struct adp5588_gpio *dev = | |
80 | container_of(chip, struct adp5588_gpio, gpio_chip); | |
81 | ||
459773ae MH |
82 | bank = ADP5588_BANK(off); |
83 | bit = ADP5588_BIT(off); | |
80884094 MH |
84 | |
85 | mutex_lock(&dev->lock); | |
86 | if (val) | |
87 | dev->dat_out[bank] |= bit; | |
88 | else | |
89 | dev->dat_out[bank] &= ~bit; | |
90 | ||
91 | adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank, | |
92 | dev->dat_out[bank]); | |
93 | mutex_unlock(&dev->lock); | |
94 | } | |
95 | ||
96 | static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off) | |
97 | { | |
98 | int ret; | |
99 | unsigned bank; | |
100 | struct adp5588_gpio *dev = | |
101 | container_of(chip, struct adp5588_gpio, gpio_chip); | |
102 | ||
459773ae | 103 | bank = ADP5588_BANK(off); |
80884094 MH |
104 | |
105 | mutex_lock(&dev->lock); | |
459773ae | 106 | dev->dir[bank] &= ~ADP5588_BIT(off); |
80884094 MH |
107 | ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]); |
108 | mutex_unlock(&dev->lock); | |
109 | ||
110 | return ret; | |
111 | } | |
112 | ||
113 | static int adp5588_gpio_direction_output(struct gpio_chip *chip, | |
114 | unsigned off, int val) | |
115 | { | |
116 | int ret; | |
117 | unsigned bank, bit; | |
118 | struct adp5588_gpio *dev = | |
119 | container_of(chip, struct adp5588_gpio, gpio_chip); | |
120 | ||
459773ae MH |
121 | bank = ADP5588_BANK(off); |
122 | bit = ADP5588_BIT(off); | |
80884094 MH |
123 | |
124 | mutex_lock(&dev->lock); | |
125 | dev->dir[bank] |= bit; | |
126 | ||
127 | if (val) | |
128 | dev->dat_out[bank] |= bit; | |
129 | else | |
130 | dev->dat_out[bank] &= ~bit; | |
131 | ||
132 | ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank, | |
133 | dev->dat_out[bank]); | |
134 | ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, | |
135 | dev->dir[bank]); | |
136 | mutex_unlock(&dev->lock); | |
137 | ||
138 | return ret; | |
139 | } | |
140 | ||
459773ae MH |
141 | #ifdef CONFIG_GPIO_ADP5588_IRQ |
142 | static int adp5588_gpio_to_irq(struct gpio_chip *chip, unsigned off) | |
143 | { | |
144 | struct adp5588_gpio *dev = | |
145 | container_of(chip, struct adp5588_gpio, gpio_chip); | |
146 | return dev->irq_base + off; | |
147 | } | |
148 | ||
12401eed | 149 | static void adp5588_irq_bus_lock(struct irq_data *d) |
459773ae | 150 | { |
12401eed LB |
151 | struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d); |
152 | ||
459773ae MH |
153 | mutex_lock(&dev->irq_lock); |
154 | } | |
155 | ||
156 | /* | |
157 | * genirq core code can issue chip->mask/unmask from atomic context. | |
158 | * This doesn't work for slow busses where an access needs to sleep. | |
159 | * bus_sync_unlock() is therefore called outside the atomic context, | |
160 | * syncs the current irq mask state with the slow external controller | |
161 | * and unlocks the bus. | |
162 | */ | |
163 | ||
12401eed | 164 | static void adp5588_irq_bus_sync_unlock(struct irq_data *d) |
459773ae | 165 | { |
12401eed | 166 | struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d); |
459773ae MH |
167 | int i; |
168 | ||
169 | for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) | |
170 | if (dev->int_en[i] ^ dev->irq_mask[i]) { | |
171 | dev->int_en[i] = dev->irq_mask[i]; | |
172 | adp5588_gpio_write(dev->client, GPIO_INT_EN1 + i, | |
173 | dev->int_en[i]); | |
174 | } | |
175 | ||
176 | mutex_unlock(&dev->irq_lock); | |
177 | } | |
178 | ||
12401eed | 179 | static void adp5588_irq_mask(struct irq_data *d) |
459773ae | 180 | { |
12401eed LB |
181 | struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d); |
182 | unsigned gpio = d->irq - dev->irq_base; | |
459773ae MH |
183 | |
184 | dev->irq_mask[ADP5588_BANK(gpio)] &= ~ADP5588_BIT(gpio); | |
185 | } | |
186 | ||
12401eed | 187 | static void adp5588_irq_unmask(struct irq_data *d) |
459773ae | 188 | { |
12401eed LB |
189 | struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d); |
190 | unsigned gpio = d->irq - dev->irq_base; | |
459773ae MH |
191 | |
192 | dev->irq_mask[ADP5588_BANK(gpio)] |= ADP5588_BIT(gpio); | |
193 | } | |
194 | ||
12401eed | 195 | static int adp5588_irq_set_type(struct irq_data *d, unsigned int type) |
459773ae | 196 | { |
12401eed LB |
197 | struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d); |
198 | uint16_t gpio = d->irq - dev->irq_base; | |
459773ae MH |
199 | unsigned bank, bit; |
200 | ||
201 | if ((type & IRQ_TYPE_EDGE_BOTH)) { | |
202 | dev_err(&dev->client->dev, "irq %d: unsupported type %d\n", | |
12401eed | 203 | d->irq, type); |
459773ae MH |
204 | return -EINVAL; |
205 | } | |
206 | ||
207 | bank = ADP5588_BANK(gpio); | |
208 | bit = ADP5588_BIT(gpio); | |
209 | ||
210 | if (type & IRQ_TYPE_LEVEL_HIGH) | |
211 | dev->int_lvl[bank] |= bit; | |
212 | else if (type & IRQ_TYPE_LEVEL_LOW) | |
213 | dev->int_lvl[bank] &= ~bit; | |
214 | else | |
215 | return -EINVAL; | |
216 | ||
217 | adp5588_gpio_direction_input(&dev->gpio_chip, gpio); | |
218 | adp5588_gpio_write(dev->client, GPIO_INT_LVL1 + bank, | |
219 | dev->int_lvl[bank]); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | static struct irq_chip adp5588_irq_chip = { | |
225 | .name = "adp5588", | |
12401eed LB |
226 | .irq_mask = adp5588_irq_mask, |
227 | .irq_unmask = adp5588_irq_unmask, | |
228 | .irq_bus_lock = adp5588_irq_bus_lock, | |
229 | .irq_bus_sync_unlock = adp5588_irq_bus_sync_unlock, | |
230 | .irq_set_type = adp5588_irq_set_type, | |
459773ae MH |
231 | }; |
232 | ||
233 | static int adp5588_gpio_read_intstat(struct i2c_client *client, u8 *buf) | |
234 | { | |
235 | int ret = i2c_smbus_read_i2c_block_data(client, GPIO_INT_STAT1, 3, buf); | |
236 | ||
237 | if (ret < 0) | |
238 | dev_err(&client->dev, "Read INT_STAT Error\n"); | |
239 | ||
240 | return ret; | |
241 | } | |
242 | ||
243 | static irqreturn_t adp5588_irq_handler(int irq, void *devid) | |
244 | { | |
245 | struct adp5588_gpio *dev = devid; | |
246 | unsigned status, bank, bit, pending; | |
247 | int ret; | |
248 | status = adp5588_gpio_read(dev->client, INT_STAT); | |
249 | ||
250 | if (status & ADP5588_GPI_INT) { | |
251 | ret = adp5588_gpio_read_intstat(dev->client, dev->irq_stat); | |
252 | if (ret < 0) | |
253 | memset(dev->irq_stat, 0, ARRAY_SIZE(dev->irq_stat)); | |
254 | ||
078dc65e | 255 | for (bank = 0, bit = 0; bank <= ADP5588_BANK(ADP5588_MAXGPIO); |
459773ae MH |
256 | bank++, bit = 0) { |
257 | pending = dev->irq_stat[bank] & dev->irq_mask[bank]; | |
258 | ||
259 | while (pending) { | |
260 | if (pending & (1 << bit)) { | |
261 | handle_nested_irq(dev->irq_base + | |
262 | (bank << 3) + bit); | |
263 | pending &= ~(1 << bit); | |
264 | ||
265 | } | |
266 | bit++; | |
267 | } | |
268 | } | |
269 | } | |
270 | ||
271 | adp5588_gpio_write(dev->client, INT_STAT, status); /* Status is W1C */ | |
272 | ||
273 | return IRQ_HANDLED; | |
274 | } | |
275 | ||
276 | static int adp5588_irq_setup(struct adp5588_gpio *dev) | |
277 | { | |
278 | struct i2c_client *client = dev->client; | |
279 | struct adp5588_gpio_platform_data *pdata = client->dev.platform_data; | |
280 | unsigned gpio; | |
281 | int ret; | |
282 | ||
283 | adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC); | |
284 | adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */ | |
285 | adp5588_gpio_read_intstat(client, dev->irq_stat); /* read to clear */ | |
286 | ||
287 | dev->irq_base = pdata->irq_base; | |
288 | mutex_init(&dev->irq_lock); | |
289 | ||
290 | for (gpio = 0; gpio < dev->gpio_chip.ngpio; gpio++) { | |
291 | int irq = gpio + dev->irq_base; | |
b51804bc TG |
292 | irq_set_chip_data(irq, dev); |
293 | irq_set_chip_and_handler(irq, &adp5588_irq_chip, | |
459773ae | 294 | handle_level_irq); |
b51804bc | 295 | irq_set_nested_thread(irq, 1); |
459773ae MH |
296 | #ifdef CONFIG_ARM |
297 | /* | |
298 | * ARM needs us to explicitly flag the IRQ as VALID, | |
299 | * once we do so, it will also set the noprobe. | |
300 | */ | |
301 | set_irq_flags(irq, IRQF_VALID); | |
302 | #else | |
b51804bc | 303 | irq_set_noprobe(irq); |
459773ae MH |
304 | #endif |
305 | } | |
306 | ||
307 | ret = request_threaded_irq(client->irq, | |
308 | NULL, | |
309 | adp5588_irq_handler, | |
310 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
311 | dev_name(&client->dev), dev); | |
312 | if (ret) { | |
313 | dev_err(&client->dev, "failed to request irq %d\n", | |
314 | client->irq); | |
315 | goto out; | |
316 | } | |
317 | ||
318 | dev->gpio_chip.to_irq = adp5588_gpio_to_irq; | |
319 | adp5588_gpio_write(client, CFG, | |
320 | ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_GPI_INT); | |
321 | ||
322 | return 0; | |
323 | ||
324 | out: | |
325 | dev->irq_base = 0; | |
326 | return ret; | |
327 | } | |
328 | ||
329 | static void adp5588_irq_teardown(struct adp5588_gpio *dev) | |
330 | { | |
331 | if (dev->irq_base) | |
332 | free_irq(dev->client->irq, dev); | |
333 | } | |
334 | ||
335 | #else | |
336 | static int adp5588_irq_setup(struct adp5588_gpio *dev) | |
337 | { | |
338 | struct i2c_client *client = dev->client; | |
339 | dev_warn(&client->dev, "interrupt support not compiled in\n"); | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static void adp5588_irq_teardown(struct adp5588_gpio *dev) | |
345 | { | |
346 | } | |
347 | #endif /* CONFIG_GPIO_ADP5588_IRQ */ | |
348 | ||
3836309d | 349 | static int adp5588_gpio_probe(struct i2c_client *client, |
80884094 MH |
350 | const struct i2c_device_id *id) |
351 | { | |
352 | struct adp5588_gpio_platform_data *pdata = client->dev.platform_data; | |
353 | struct adp5588_gpio *dev; | |
354 | struct gpio_chip *gc; | |
355 | int ret, i, revid; | |
356 | ||
357 | if (pdata == NULL) { | |
358 | dev_err(&client->dev, "missing platform data\n"); | |
359 | return -ENODEV; | |
360 | } | |
361 | ||
362 | if (!i2c_check_functionality(client->adapter, | |
363 | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
364 | dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); | |
365 | return -EIO; | |
366 | } | |
367 | ||
368 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
369 | if (dev == NULL) { | |
370 | dev_err(&client->dev, "failed to alloc memory\n"); | |
371 | return -ENOMEM; | |
372 | } | |
373 | ||
374 | dev->client = client; | |
375 | ||
376 | gc = &dev->gpio_chip; | |
377 | gc->direction_input = adp5588_gpio_direction_input; | |
378 | gc->direction_output = adp5588_gpio_direction_output; | |
379 | gc->get = adp5588_gpio_get_value; | |
380 | gc->set = adp5588_gpio_set_value; | |
381 | gc->can_sleep = 1; | |
382 | ||
383 | gc->base = pdata->gpio_start; | |
459773ae | 384 | gc->ngpio = ADP5588_MAXGPIO; |
80884094 MH |
385 | gc->label = client->name; |
386 | gc->owner = THIS_MODULE; | |
387 | ||
388 | mutex_init(&dev->lock); | |
389 | ||
80884094 MH |
390 | ret = adp5588_gpio_read(dev->client, DEV_ID); |
391 | if (ret < 0) | |
392 | goto err; | |
393 | ||
394 | revid = ret & ADP5588_DEVICE_ID_MASK; | |
395 | ||
459773ae | 396 | for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) { |
80884094 MH |
397 | dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i); |
398 | dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i); | |
399 | ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0); | |
400 | ret |= adp5588_gpio_write(client, GPIO_PULL1 + i, | |
401 | (pdata->pullup_dis_mask >> (8 * i)) & 0xFF); | |
459773ae | 402 | ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0); |
80884094 MH |
403 | if (ret) |
404 | goto err; | |
405 | } | |
406 | ||
459773ae MH |
407 | if (pdata->irq_base) { |
408 | if (WA_DELAYED_READOUT_REVID(revid)) { | |
409 | dev_warn(&client->dev, "GPIO int not supported\n"); | |
410 | } else { | |
411 | ret = adp5588_irq_setup(dev); | |
412 | if (ret) | |
413 | goto err; | |
414 | } | |
415 | } | |
416 | ||
80884094 MH |
417 | ret = gpiochip_add(&dev->gpio_chip); |
418 | if (ret) | |
459773ae | 419 | goto err_irq; |
80884094 | 420 | |
64842aad GL |
421 | dev_info(&client->dev, "IRQ Base: %d Rev.: %d\n", |
422 | pdata->irq_base, revid); | |
80884094 MH |
423 | |
424 | if (pdata->setup) { | |
425 | ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context); | |
426 | if (ret < 0) | |
427 | dev_warn(&client->dev, "setup failed, %d\n", ret); | |
428 | } | |
429 | ||
430 | i2c_set_clientdata(client, dev); | |
459773ae | 431 | |
80884094 MH |
432 | return 0; |
433 | ||
459773ae MH |
434 | err_irq: |
435 | adp5588_irq_teardown(dev); | |
80884094 MH |
436 | err: |
437 | kfree(dev); | |
438 | return ret; | |
439 | } | |
440 | ||
206210ce | 441 | static int adp5588_gpio_remove(struct i2c_client *client) |
80884094 MH |
442 | { |
443 | struct adp5588_gpio_platform_data *pdata = client->dev.platform_data; | |
444 | struct adp5588_gpio *dev = i2c_get_clientdata(client); | |
445 | int ret; | |
446 | ||
447 | if (pdata->teardown) { | |
448 | ret = pdata->teardown(client, | |
449 | dev->gpio_chip.base, dev->gpio_chip.ngpio, | |
450 | pdata->context); | |
451 | if (ret < 0) { | |
452 | dev_err(&client->dev, "teardown failed %d\n", ret); | |
453 | return ret; | |
454 | } | |
455 | } | |
456 | ||
459773ae MH |
457 | if (dev->irq_base) |
458 | free_irq(dev->client->irq, dev); | |
459 | ||
80884094 MH |
460 | ret = gpiochip_remove(&dev->gpio_chip); |
461 | if (ret) { | |
462 | dev_err(&client->dev, "gpiochip_remove failed %d\n", ret); | |
463 | return ret; | |
464 | } | |
465 | ||
466 | kfree(dev); | |
467 | return 0; | |
468 | } | |
469 | ||
470 | static const struct i2c_device_id adp5588_gpio_id[] = { | |
471 | {DRV_NAME, 0}, | |
472 | {} | |
473 | }; | |
474 | ||
475 | MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id); | |
476 | ||
477 | static struct i2c_driver adp5588_gpio_driver = { | |
478 | .driver = { | |
479 | .name = DRV_NAME, | |
480 | }, | |
481 | .probe = adp5588_gpio_probe, | |
8283c4ff | 482 | .remove = adp5588_gpio_remove, |
80884094 MH |
483 | .id_table = adp5588_gpio_id, |
484 | }; | |
485 | ||
c8554d32 | 486 | module_i2c_driver(adp5588_gpio_driver); |
80884094 MH |
487 | |
488 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
489 | MODULE_DESCRIPTION("GPIO ADP5588 Driver"); | |
490 | MODULE_LICENSE("GPL"); |