blob: 6bdb78c2ac77de535214d80a09cd9a302653d219 [file] [log] [blame]
Cory Maccarrone6048a3d2010-01-19 11:22:45 +01001/*
2 * htc-i2cpld.c
3 * Chip driver for an unknown CPLD chip found on omap850 HTC devices like
4 * the HTC Wizard and HTC Herald.
5 * The cpld is located on the i2c bus and acts as an input/output GPIO
6 * extender.
7 *
8 * Copyright (C) 2009 Cory Maccarrone <darkstar6262@gmail.com>
9 *
10 * Based on work done in the linwizard project
11 * Copyright (C) 2008-2009 Angelo Arrifano <miknix@gmail.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28#include <linux/kernel.h>
29#include <linux/init.h>
30#include <linux/module.h>
31#include <linux/interrupt.h>
32#include <linux/platform_device.h>
33#include <linux/i2c.h>
34#include <linux/irq.h>
35#include <linux/spinlock.h>
36#include <linux/htcpld.h>
37#include <linux/gpio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090038#include <linux/slab.h>
Cory Maccarrone6048a3d2010-01-19 11:22:45 +010039
40struct htcpld_chip {
41 spinlock_t lock;
42
43 /* chip info */
44 u8 reset;
45 u8 addr;
46 struct device *dev;
47 struct i2c_client *client;
48
49 /* Output details */
50 u8 cache_out;
51 struct gpio_chip chip_out;
52
53 /* Input details */
54 u8 cache_in;
55 struct gpio_chip chip_in;
56
57 u16 irqs_enabled;
58 uint irq_start;
59 int nirqs;
60
Thomas Gleixner9eaee992011-03-25 11:12:29 +000061 unsigned int flow_type;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +010062 /*
63 * Work structure to allow for setting values outside of any
64 * possible interrupt context
65 */
66 struct work_struct set_val_work;
67};
68
69struct htcpld_data {
70 /* irq info */
71 u16 irqs_enabled;
72 uint irq_start;
73 int nirqs;
74 uint chained_irq;
75 unsigned int int_reset_gpio_hi;
76 unsigned int int_reset_gpio_lo;
77
78 /* htcpld info */
79 struct htcpld_chip *chip;
80 unsigned int nchips;
81};
82
83/* There does not appear to be a way to proactively mask interrupts
84 * on the htcpld chip itself. So, we simply ignore interrupts that
85 * aren't desired. */
Mark Browne6a4c4a2010-12-11 16:44:11 +000086static void htcpld_mask(struct irq_data *data)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +010087{
Mark Browne6a4c4a2010-12-11 16:44:11 +000088 struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);
89 chip->irqs_enabled &= ~(1 << (data->irq - chip->irq_start));
90 pr_debug("HTCPLD mask %d %04x\n", data->irq, chip->irqs_enabled);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +010091}
Mark Browne6a4c4a2010-12-11 16:44:11 +000092static void htcpld_unmask(struct irq_data *data)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +010093{
Mark Browne6a4c4a2010-12-11 16:44:11 +000094 struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);
95 chip->irqs_enabled |= 1 << (data->irq - chip->irq_start);
96 pr_debug("HTCPLD unmask %d %04x\n", data->irq, chip->irqs_enabled);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +010097}
98
Mark Browne6a4c4a2010-12-11 16:44:11 +000099static int htcpld_set_type(struct irq_data *data, unsigned int flags)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100100{
Thomas Gleixner9eaee992011-03-25 11:12:29 +0000101 struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100102
103 if (flags & ~IRQ_TYPE_SENSE_MASK)
104 return -EINVAL;
105
106 /* We only allow edge triggering */
107 if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))
108 return -EINVAL;
109
Thomas Gleixner9eaee992011-03-25 11:12:29 +0000110 chip->flow_type = flags;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100111 return 0;
112}
113
114static struct irq_chip htcpld_muxed_chip = {
Mark Browne6a4c4a2010-12-11 16:44:11 +0000115 .name = "htcpld",
116 .irq_mask = htcpld_mask,
117 .irq_unmask = htcpld_unmask,
118 .irq_set_type = htcpld_set_type,
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100119};
120
121/* To properly dispatch IRQ events, we need to read from the
122 * chip. This is an I2C action that could possibly sleep
123 * (which is bad in interrupt context) -- so we use a threaded
124 * interrupt handler to get around that.
125 */
126static irqreturn_t htcpld_handler(int irq, void *dev)
127{
128 struct htcpld_data *htcpld = dev;
129 unsigned int i;
130 unsigned long flags;
131 int irqpin;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100132
133 if (!htcpld) {
134 pr_debug("htcpld is null in ISR\n");
135 return IRQ_HANDLED;
136 }
137
138 /*
139 * For each chip, do a read of the chip and trigger any interrupts
140 * desired. The interrupts will be triggered from LSB to MSB (i.e.
141 * bit 0 first, then bit 1, etc.)
142 *
143 * For chips that have no interrupt range specified, just skip 'em.
144 */
145 for (i = 0; i < htcpld->nchips; i++) {
146 struct htcpld_chip *chip = &htcpld->chip[i];
147 struct i2c_client *client;
148 int val;
149 unsigned long uval, old_val;
150
151 if (!chip) {
152 pr_debug("chip %d is null in ISR\n", i);
153 continue;
154 }
155
156 if (chip->nirqs == 0)
157 continue;
158
159 client = chip->client;
160 if (!client) {
161 pr_debug("client %d is null in ISR\n", i);
162 continue;
163 }
164
165 /* Scan the chip */
166 val = i2c_smbus_read_byte_data(client, chip->cache_out);
167 if (val < 0) {
168 /* Throw a warning and skip this chip */
169 dev_warn(chip->dev, "Unable to read from chip: %d\n",
170 val);
171 continue;
172 }
173
174 uval = (unsigned long)val;
175
176 spin_lock_irqsave(&chip->lock, flags);
177
178 /* Save away the old value so we can compare it */
179 old_val = chip->cache_in;
180
181 /* Write the new value */
182 chip->cache_in = uval;
183
184 spin_unlock_irqrestore(&chip->lock, flags);
185
186 /*
187 * For each bit in the data (starting at bit 0), trigger
188 * associated interrupts.
189 */
190 for (irqpin = 0; irqpin < chip->nirqs; irqpin++) {
Thomas Gleixner9eaee992011-03-25 11:12:29 +0000191 unsigned oldb, newb, type = chip->flow_type;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100192
193 irq = chip->irq_start + irqpin;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100194
195 /* Run the IRQ handler, but only if the bit value
196 * changed, and the proper flags are set */
197 oldb = (old_val >> irqpin) & 1;
198 newb = (uval >> irqpin) & 1;
199
Thomas Gleixner9eaee992011-03-25 11:12:29 +0000200 if ((!oldb && newb && (type & IRQ_TYPE_EDGE_RISING)) ||
201 (oldb && !newb && (type & IRQ_TYPE_EDGE_FALLING))) {
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100202 pr_debug("fire IRQ %d\n", irqpin);
Thomas Gleixner9eaee992011-03-25 11:12:29 +0000203 generic_handle_irq(irq);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100204 }
205 }
206 }
207
208 /*
209 * In order to continue receiving interrupts, the int_reset_gpio must
210 * be asserted.
211 */
212 if (htcpld->int_reset_gpio_hi)
213 gpio_set_value(htcpld->int_reset_gpio_hi, 1);
214 if (htcpld->int_reset_gpio_lo)
215 gpio_set_value(htcpld->int_reset_gpio_lo, 0);
216
217 return IRQ_HANDLED;
218}
219
220/*
221 * The GPIO set routines can be called from interrupt context, especially if,
222 * for example they're attached to the led-gpio framework and a trigger is
223 * enabled. As such, we declared work above in the htcpld_chip structure,
224 * and that work is scheduled in the set routine. The kernel can then run
225 * the I2C functions, which will sleep, in process context.
226 */
Mark Brown8d2d3a32010-12-11 16:44:49 +0000227static void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100228{
229 struct i2c_client *client;
230 struct htcpld_chip *chip_data;
231 unsigned long flags;
232
233 chip_data = container_of(chip, struct htcpld_chip, chip_out);
234 if (!chip_data)
235 return;
236
237 client = chip_data->client;
238 if (client == NULL)
239 return;
240
241 spin_lock_irqsave(&chip_data->lock, flags);
242 if (val)
243 chip_data->cache_out |= (1 << offset);
244 else
245 chip_data->cache_out &= ~(1 << offset);
246 spin_unlock_irqrestore(&chip_data->lock, flags);
247
248 schedule_work(&(chip_data->set_val_work));
249}
250
Mark Brown8d2d3a32010-12-11 16:44:49 +0000251static void htcpld_chip_set_ni(struct work_struct *work)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100252{
253 struct htcpld_chip *chip_data;
254 struct i2c_client *client;
255
256 chip_data = container_of(work, struct htcpld_chip, set_val_work);
257 client = chip_data->client;
258 i2c_smbus_read_byte_data(client, chip_data->cache_out);
259}
260
Mark Brown8d2d3a32010-12-11 16:44:49 +0000261static int htcpld_chip_get(struct gpio_chip *chip, unsigned offset)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100262{
263 struct htcpld_chip *chip_data;
264 int val = 0;
265 int is_input = 0;
266
267 /* Try out first */
268 chip_data = container_of(chip, struct htcpld_chip, chip_out);
269 if (!chip_data) {
270 /* Try in */
271 is_input = 1;
272 chip_data = container_of(chip, struct htcpld_chip, chip_in);
273 if (!chip_data)
274 return -EINVAL;
275 }
276
277 /* Determine if this is an input or output GPIO */
278 if (!is_input)
279 /* Use the output cache */
280 val = (chip_data->cache_out >> offset) & 1;
281 else
282 /* Use the input cache */
283 val = (chip_data->cache_in >> offset) & 1;
284
285 if (val)
286 return 1;
287 else
288 return 0;
289}
290
291static int htcpld_direction_output(struct gpio_chip *chip,
292 unsigned offset, int value)
293{
294 htcpld_chip_set(chip, offset, value);
295 return 0;
296}
297
298static int htcpld_direction_input(struct gpio_chip *chip,
299 unsigned offset)
300{
301 /*
302 * No-op: this function can only be called on the input chip.
303 * We do however make sure the offset is within range.
304 */
305 return (offset < chip->ngpio) ? 0 : -EINVAL;
306}
307
Mark Brown8d2d3a32010-12-11 16:44:49 +0000308static int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100309{
310 struct htcpld_chip *chip_data;
311
312 chip_data = container_of(chip, struct htcpld_chip, chip_in);
313
314 if (offset < chip_data->nirqs)
315 return chip_data->irq_start + offset;
316 else
317 return -EINVAL;
318}
319
Mark Brown8d2d3a32010-12-11 16:44:49 +0000320static void htcpld_chip_reset(struct i2c_client *client)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100321{
322 struct htcpld_chip *chip_data = i2c_get_clientdata(client);
323 if (!chip_data)
324 return;
325
326 i2c_smbus_read_byte_data(
327 client, (chip_data->cache_out = chip_data->reset));
328}
329
Bill Pembertonf791be42012-11-19 13:23:04 -0500330static int htcpld_setup_chip_irq(
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100331 struct platform_device *pdev,
332 int chip_index)
333{
334 struct htcpld_data *htcpld;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100335 struct htcpld_chip *chip;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100336 unsigned int irq, irq_end;
337 int ret = 0;
338
339 /* Get the platform and driver data */
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100340 htcpld = platform_get_drvdata(pdev);
341 chip = &htcpld->chip[chip_index];
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100342
343 /* Setup irq handlers */
344 irq_end = chip->irq_start + chip->nirqs;
345 for (irq = chip->irq_start; irq < irq_end; irq++) {
Thomas Gleixnerd6f7ce9f2011-03-25 11:12:35 +0000346 irq_set_chip_and_handler(irq, &htcpld_muxed_chip,
347 handle_simple_irq);
Thomas Gleixnerd5bb1222011-03-25 11:12:32 +0000348 irq_set_chip_data(irq, chip);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100349#ifdef CONFIG_ARM
350 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
351#else
Thomas Gleixnerd5bb1222011-03-25 11:12:32 +0000352 irq_set_probe(irq);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100353#endif
354 }
355
356 return ret;
357}
358
Bill Pembertonf791be42012-11-19 13:23:04 -0500359static int htcpld_register_chip_i2c(
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100360 struct platform_device *pdev,
361 int chip_index)
362{
363 struct htcpld_data *htcpld;
364 struct device *dev = &pdev->dev;
365 struct htcpld_core_platform_data *pdata;
366 struct htcpld_chip *chip;
367 struct htcpld_chip_platform_data *plat_chip_data;
368 struct i2c_adapter *adapter;
369 struct i2c_client *client;
370 struct i2c_board_info info;
371
372 /* Get the platform and driver data */
Jingoo Han334a41c2013-07-30 17:10:05 +0900373 pdata = dev_get_platdata(dev);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100374 htcpld = platform_get_drvdata(pdev);
375 chip = &htcpld->chip[chip_index];
376 plat_chip_data = &pdata->chip[chip_index];
377
378 adapter = i2c_get_adapter(pdata->i2c_adapter_id);
379 if (adapter == NULL) {
380 /* Eek, no such I2C adapter! Bail out. */
381 dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n",
382 plat_chip_data->addr, pdata->i2c_adapter_id);
383 return -ENODEV;
384 }
385
386 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
387 dev_warn(dev, "i2c adapter %d non-functional\n",
388 pdata->i2c_adapter_id);
389 return -EINVAL;
390 }
391
392 memset(&info, 0, sizeof(struct i2c_board_info));
393 info.addr = plat_chip_data->addr;
394 strlcpy(info.type, "htcpld-chip", I2C_NAME_SIZE);
395 info.platform_data = chip;
396
397 /* Add the I2C device. This calls the probe() function. */
398 client = i2c_new_device(adapter, &info);
399 if (!client) {
400 /* I2C device registration failed, contineu with the next */
401 dev_warn(dev, "Unable to add I2C device for 0x%x\n",
402 plat_chip_data->addr);
403 return -ENODEV;
404 }
405
406 i2c_set_clientdata(client, chip);
Hans Wennborg6065c9a2014-08-03 17:19:15 -0700407 snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%x", client->addr);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100408 chip->client = client;
409
410 /* Reset the chip */
411 htcpld_chip_reset(client);
412 chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out);
413
414 return 0;
415}
416
Bill Pembertonf791be42012-11-19 13:23:04 -0500417static void htcpld_unregister_chip_i2c(
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100418 struct platform_device *pdev,
419 int chip_index)
420{
421 struct htcpld_data *htcpld;
422 struct htcpld_chip *chip;
423
424 /* Get the platform and driver data */
425 htcpld = platform_get_drvdata(pdev);
426 chip = &htcpld->chip[chip_index];
427
428 if (chip->client)
429 i2c_unregister_device(chip->client);
430}
431
Bill Pembertonf791be42012-11-19 13:23:04 -0500432static int htcpld_register_chip_gpio(
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100433 struct platform_device *pdev,
434 int chip_index)
435{
436 struct htcpld_data *htcpld;
437 struct device *dev = &pdev->dev;
438 struct htcpld_core_platform_data *pdata;
439 struct htcpld_chip *chip;
440 struct htcpld_chip_platform_data *plat_chip_data;
441 struct gpio_chip *gpio_chip;
442 int ret = 0;
443
444 /* Get the platform and driver data */
Jingoo Han334a41c2013-07-30 17:10:05 +0900445 pdata = dev_get_platdata(dev);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100446 htcpld = platform_get_drvdata(pdev);
447 chip = &htcpld->chip[chip_index];
448 plat_chip_data = &pdata->chip[chip_index];
449
450 /* Setup the GPIO chips */
451 gpio_chip = &(chip->chip_out);
452 gpio_chip->label = "htcpld-out";
453 gpio_chip->dev = dev;
454 gpio_chip->owner = THIS_MODULE;
455 gpio_chip->get = htcpld_chip_get;
456 gpio_chip->set = htcpld_chip_set;
457 gpio_chip->direction_input = NULL;
458 gpio_chip->direction_output = htcpld_direction_output;
459 gpio_chip->base = plat_chip_data->gpio_out_base;
460 gpio_chip->ngpio = plat_chip_data->num_gpios;
461
462 gpio_chip = &(chip->chip_in);
463 gpio_chip->label = "htcpld-in";
464 gpio_chip->dev = dev;
465 gpio_chip->owner = THIS_MODULE;
466 gpio_chip->get = htcpld_chip_get;
467 gpio_chip->set = NULL;
468 gpio_chip->direction_input = htcpld_direction_input;
469 gpio_chip->direction_output = NULL;
470 gpio_chip->to_irq = htcpld_chip_to_irq;
471 gpio_chip->base = plat_chip_data->gpio_in_base;
472 gpio_chip->ngpio = plat_chip_data->num_gpios;
473
474 /* Add the GPIO chips */
475 ret = gpiochip_add(&(chip->chip_out));
476 if (ret) {
477 dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n",
478 plat_chip_data->addr, ret);
479 return ret;
480 }
481
482 ret = gpiochip_add(&(chip->chip_in));
483 if (ret) {
484 int error;
485
486 dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n",
487 plat_chip_data->addr, ret);
488
489 error = gpiochip_remove(&(chip->chip_out));
490 if (error)
491 dev_warn(dev, "Error while trying to unregister gpio chip: %d\n", error);
492
493 return ret;
494 }
495
496 return 0;
497}
498
Bill Pembertonf791be42012-11-19 13:23:04 -0500499static int htcpld_setup_chips(struct platform_device *pdev)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100500{
501 struct htcpld_data *htcpld;
502 struct device *dev = &pdev->dev;
503 struct htcpld_core_platform_data *pdata;
504 int i;
505
506 /* Get the platform and driver data */
Jingoo Han334a41c2013-07-30 17:10:05 +0900507 pdata = dev_get_platdata(dev);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100508 htcpld = platform_get_drvdata(pdev);
509
510 /* Setup each chip's output GPIOs */
511 htcpld->nchips = pdata->num_chip;
Lee Jones2b0b5e22013-05-23 16:25:13 +0100512 htcpld->chip = devm_kzalloc(dev, sizeof(struct htcpld_chip) * htcpld->nchips,
513 GFP_KERNEL);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100514 if (!htcpld->chip) {
515 dev_warn(dev, "Unable to allocate memory for chips\n");
516 return -ENOMEM;
517 }
518
519 /* Add the chips as best we can */
520 for (i = 0; i < htcpld->nchips; i++) {
521 int ret;
522
523 /* Setup the HTCPLD chips */
524 htcpld->chip[i].reset = pdata->chip[i].reset;
525 htcpld->chip[i].cache_out = pdata->chip[i].reset;
526 htcpld->chip[i].cache_in = 0;
527 htcpld->chip[i].dev = dev;
528 htcpld->chip[i].irq_start = pdata->chip[i].irq_base;
529 htcpld->chip[i].nirqs = pdata->chip[i].num_irqs;
530
531 INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni);
532 spin_lock_init(&(htcpld->chip[i].lock));
533
534 /* Setup the interrupts for the chip */
535 if (htcpld->chained_irq) {
536 ret = htcpld_setup_chip_irq(pdev, i);
537 if (ret)
538 continue;
539 }
540
541 /* Register the chip with I2C */
542 ret = htcpld_register_chip_i2c(pdev, i);
543 if (ret)
544 continue;
545
546
547 /* Register the chips with the GPIO subsystem */
548 ret = htcpld_register_chip_gpio(pdev, i);
549 if (ret) {
550 /* Unregister the chip from i2c and continue */
551 htcpld_unregister_chip_i2c(pdev, i);
552 continue;
553 }
554
555 dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr);
556 }
557
558 return 0;
559}
560
Bill Pembertonf791be42012-11-19 13:23:04 -0500561static int htcpld_core_probe(struct platform_device *pdev)
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100562{
563 struct htcpld_data *htcpld;
564 struct device *dev = &pdev->dev;
565 struct htcpld_core_platform_data *pdata;
566 struct resource *res;
567 int ret = 0;
568
569 if (!dev)
570 return -ENODEV;
571
Jingoo Han334a41c2013-07-30 17:10:05 +0900572 pdata = dev_get_platdata(dev);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100573 if (!pdata) {
574 dev_warn(dev, "Platform data not found for htcpld core!\n");
575 return -ENXIO;
576 }
577
Lee Jones2b0b5e22013-05-23 16:25:13 +0100578 htcpld = devm_kzalloc(dev, sizeof(struct htcpld_data), GFP_KERNEL);
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100579 if (!htcpld)
580 return -ENOMEM;
581
582 /* Find chained irq */
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100583 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
584 if (res) {
585 int flags;
586 htcpld->chained_irq = res->start;
587
588 /* Setup the chained interrupt handler */
589 flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
590 ret = request_threaded_irq(htcpld->chained_irq,
591 NULL, htcpld_handler,
592 flags, pdev->name, htcpld);
593 if (ret) {
594 dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret);
Lee Jones2b0b5e22013-05-23 16:25:13 +0100595 return ret;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100596 } else
597 device_init_wakeup(dev, 0);
598 }
599
600 /* Set the driver data */
601 platform_set_drvdata(pdev, htcpld);
602
603 /* Setup the htcpld chips */
604 ret = htcpld_setup_chips(pdev);
605 if (ret)
Lee Jones2b0b5e22013-05-23 16:25:13 +0100606 return ret;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100607
608 /* Request the GPIO(s) for the int reset and set them up */
609 if (pdata->int_reset_gpio_hi) {
610 ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core");
611 if (ret) {
612 /*
613 * If it failed, that sucks, but we can probably
614 * continue on without it.
615 */
616 dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n");
617 htcpld->int_reset_gpio_hi = 0;
618 } else {
619 htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi;
620 gpio_set_value(htcpld->int_reset_gpio_hi, 1);
621 }
622 }
623
624 if (pdata->int_reset_gpio_lo) {
625 ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core");
626 if (ret) {
627 /*
628 * If it failed, that sucks, but we can probably
629 * continue on without it.
630 */
631 dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n");
632 htcpld->int_reset_gpio_lo = 0;
633 } else {
634 htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo;
635 gpio_set_value(htcpld->int_reset_gpio_lo, 0);
636 }
637 }
638
639 dev_info(dev, "Initialized successfully\n");
640 return 0;
Cory Maccarrone6048a3d2010-01-19 11:22:45 +0100641}
642
643/* The I2C Driver -- used internally */
644static const struct i2c_device_id htcpld_chip_id[] = {
645 { "htcpld-chip", 0 },
646 { }
647};
648MODULE_DEVICE_TABLE(i2c, htcpld_chip_id);
649
650
651static struct i2c_driver htcpld_chip_driver = {
652 .driver = {
653 .name = "htcpld-chip",
654 },
655 .id_table = htcpld_chip_id,
656};
657
658/* The Core Driver */
659static struct platform_driver htcpld_core_driver = {
660 .driver = {
661 .name = "i2c-htcpld",
662 },
663};
664
665static int __init htcpld_core_init(void)
666{
667 int ret;
668
669 /* Register the I2C Chip driver */
670 ret = i2c_add_driver(&htcpld_chip_driver);
671 if (ret)
672 return ret;
673
674 /* Probe for our chips */
675 return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe);
676}
677
678static void __exit htcpld_core_exit(void)
679{
680 i2c_del_driver(&htcpld_chip_driver);
681 platform_driver_unregister(&htcpld_core_driver);
682}
683
684module_init(htcpld_core_init);
685module_exit(htcpld_core_exit);
686
687MODULE_AUTHOR("Cory Maccarrone <darkstar6262@gmail.com>");
688MODULE_DESCRIPTION("I2C HTC PLD Driver");
689MODULE_LICENSE("GPL");
690