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6048a3dd CM |
1 | /* |
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> | |
6048a3dd CM |
30 | #include <linux/interrupt.h> |
31 | #include <linux/platform_device.h> | |
32 | #include <linux/i2c.h> | |
33 | #include <linux/irq.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/htcpld.h> | |
36 | #include <linux/gpio.h> | |
5a0e3ad6 | 37 | #include <linux/slab.h> |
6048a3dd CM |
38 | |
39 | struct htcpld_chip { | |
40 | spinlock_t lock; | |
41 | ||
42 | /* chip info */ | |
43 | u8 reset; | |
44 | u8 addr; | |
45 | struct device *dev; | |
46 | struct i2c_client *client; | |
47 | ||
48 | /* Output details */ | |
49 | u8 cache_out; | |
50 | struct gpio_chip chip_out; | |
51 | ||
52 | /* Input details */ | |
53 | u8 cache_in; | |
54 | struct gpio_chip chip_in; | |
55 | ||
56 | u16 irqs_enabled; | |
57 | uint irq_start; | |
58 | int nirqs; | |
59 | ||
9eaee99e | 60 | unsigned int flow_type; |
6048a3dd CM |
61 | /* |
62 | * Work structure to allow for setting values outside of any | |
63 | * possible interrupt context | |
64 | */ | |
65 | struct work_struct set_val_work; | |
66 | }; | |
67 | ||
68 | struct htcpld_data { | |
69 | /* irq info */ | |
70 | u16 irqs_enabled; | |
71 | uint irq_start; | |
72 | int nirqs; | |
73 | uint chained_irq; | |
74 | unsigned int int_reset_gpio_hi; | |
75 | unsigned int int_reset_gpio_lo; | |
76 | ||
77 | /* htcpld info */ | |
78 | struct htcpld_chip *chip; | |
79 | unsigned int nchips; | |
80 | }; | |
81 | ||
82 | /* There does not appear to be a way to proactively mask interrupts | |
83 | * on the htcpld chip itself. So, we simply ignore interrupts that | |
84 | * aren't desired. */ | |
e6a4c4a4 | 85 | static void htcpld_mask(struct irq_data *data) |
6048a3dd | 86 | { |
e6a4c4a4 MB |
87 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
88 | chip->irqs_enabled &= ~(1 << (data->irq - chip->irq_start)); | |
89 | pr_debug("HTCPLD mask %d %04x\n", data->irq, chip->irqs_enabled); | |
6048a3dd | 90 | } |
e6a4c4a4 | 91 | static void htcpld_unmask(struct irq_data *data) |
6048a3dd | 92 | { |
e6a4c4a4 MB |
93 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
94 | chip->irqs_enabled |= 1 << (data->irq - chip->irq_start); | |
95 | pr_debug("HTCPLD unmask %d %04x\n", data->irq, chip->irqs_enabled); | |
6048a3dd CM |
96 | } |
97 | ||
e6a4c4a4 | 98 | static int htcpld_set_type(struct irq_data *data, unsigned int flags) |
6048a3dd | 99 | { |
9eaee99e | 100 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
6048a3dd CM |
101 | |
102 | if (flags & ~IRQ_TYPE_SENSE_MASK) | |
103 | return -EINVAL; | |
104 | ||
105 | /* We only allow edge triggering */ | |
106 | if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)) | |
107 | return -EINVAL; | |
108 | ||
9eaee99e | 109 | chip->flow_type = flags; |
6048a3dd CM |
110 | return 0; |
111 | } | |
112 | ||
113 | static struct irq_chip htcpld_muxed_chip = { | |
e6a4c4a4 MB |
114 | .name = "htcpld", |
115 | .irq_mask = htcpld_mask, | |
116 | .irq_unmask = htcpld_unmask, | |
117 | .irq_set_type = htcpld_set_type, | |
6048a3dd CM |
118 | }; |
119 | ||
120 | /* To properly dispatch IRQ events, we need to read from the | |
121 | * chip. This is an I2C action that could possibly sleep | |
122 | * (which is bad in interrupt context) -- so we use a threaded | |
123 | * interrupt handler to get around that. | |
124 | */ | |
125 | static irqreturn_t htcpld_handler(int irq, void *dev) | |
126 | { | |
127 | struct htcpld_data *htcpld = dev; | |
128 | unsigned int i; | |
129 | unsigned long flags; | |
130 | int irqpin; | |
6048a3dd CM |
131 | |
132 | if (!htcpld) { | |
133 | pr_debug("htcpld is null in ISR\n"); | |
134 | return IRQ_HANDLED; | |
135 | } | |
136 | ||
137 | /* | |
138 | * For each chip, do a read of the chip and trigger any interrupts | |
139 | * desired. The interrupts will be triggered from LSB to MSB (i.e. | |
140 | * bit 0 first, then bit 1, etc.) | |
141 | * | |
142 | * For chips that have no interrupt range specified, just skip 'em. | |
143 | */ | |
144 | for (i = 0; i < htcpld->nchips; i++) { | |
145 | struct htcpld_chip *chip = &htcpld->chip[i]; | |
146 | struct i2c_client *client; | |
147 | int val; | |
148 | unsigned long uval, old_val; | |
149 | ||
150 | if (!chip) { | |
151 | pr_debug("chip %d is null in ISR\n", i); | |
152 | continue; | |
153 | } | |
154 | ||
155 | if (chip->nirqs == 0) | |
156 | continue; | |
157 | ||
158 | client = chip->client; | |
159 | if (!client) { | |
160 | pr_debug("client %d is null in ISR\n", i); | |
161 | continue; | |
162 | } | |
163 | ||
164 | /* Scan the chip */ | |
165 | val = i2c_smbus_read_byte_data(client, chip->cache_out); | |
166 | if (val < 0) { | |
167 | /* Throw a warning and skip this chip */ | |
168 | dev_warn(chip->dev, "Unable to read from chip: %d\n", | |
169 | val); | |
170 | continue; | |
171 | } | |
172 | ||
173 | uval = (unsigned long)val; | |
174 | ||
175 | spin_lock_irqsave(&chip->lock, flags); | |
176 | ||
177 | /* Save away the old value so we can compare it */ | |
178 | old_val = chip->cache_in; | |
179 | ||
180 | /* Write the new value */ | |
181 | chip->cache_in = uval; | |
182 | ||
183 | spin_unlock_irqrestore(&chip->lock, flags); | |
184 | ||
185 | /* | |
186 | * For each bit in the data (starting at bit 0), trigger | |
187 | * associated interrupts. | |
188 | */ | |
189 | for (irqpin = 0; irqpin < chip->nirqs; irqpin++) { | |
9eaee99e | 190 | unsigned oldb, newb, type = chip->flow_type; |
6048a3dd CM |
191 | |
192 | irq = chip->irq_start + irqpin; | |
6048a3dd CM |
193 | |
194 | /* Run the IRQ handler, but only if the bit value | |
195 | * changed, and the proper flags are set */ | |
196 | oldb = (old_val >> irqpin) & 1; | |
197 | newb = (uval >> irqpin) & 1; | |
198 | ||
9eaee99e TG |
199 | if ((!oldb && newb && (type & IRQ_TYPE_EDGE_RISING)) || |
200 | (oldb && !newb && (type & IRQ_TYPE_EDGE_FALLING))) { | |
6048a3dd | 201 | pr_debug("fire IRQ %d\n", irqpin); |
9eaee99e | 202 | generic_handle_irq(irq); |
6048a3dd CM |
203 | } |
204 | } | |
205 | } | |
206 | ||
207 | /* | |
208 | * In order to continue receiving interrupts, the int_reset_gpio must | |
209 | * be asserted. | |
210 | */ | |
211 | if (htcpld->int_reset_gpio_hi) | |
212 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); | |
213 | if (htcpld->int_reset_gpio_lo) | |
214 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); | |
215 | ||
216 | return IRQ_HANDLED; | |
217 | } | |
218 | ||
219 | /* | |
220 | * The GPIO set routines can be called from interrupt context, especially if, | |
221 | * for example they're attached to the led-gpio framework and a trigger is | |
222 | * enabled. As such, we declared work above in the htcpld_chip structure, | |
223 | * and that work is scheduled in the set routine. The kernel can then run | |
224 | * the I2C functions, which will sleep, in process context. | |
225 | */ | |
8d2d3a3a | 226 | static void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val) |
6048a3dd CM |
227 | { |
228 | struct i2c_client *client; | |
ed1c9b3c | 229 | struct htcpld_chip *chip_data = gpiochip_get_data(chip); |
6048a3dd CM |
230 | unsigned long flags; |
231 | ||
6048a3dd | 232 | client = chip_data->client; |
41cc08e9 | 233 | if (!client) |
6048a3dd CM |
234 | return; |
235 | ||
236 | spin_lock_irqsave(&chip_data->lock, flags); | |
237 | if (val) | |
238 | chip_data->cache_out |= (1 << offset); | |
239 | else | |
240 | chip_data->cache_out &= ~(1 << offset); | |
241 | spin_unlock_irqrestore(&chip_data->lock, flags); | |
242 | ||
243 | schedule_work(&(chip_data->set_val_work)); | |
244 | } | |
245 | ||
8d2d3a3a | 246 | static void htcpld_chip_set_ni(struct work_struct *work) |
6048a3dd CM |
247 | { |
248 | struct htcpld_chip *chip_data; | |
249 | struct i2c_client *client; | |
250 | ||
251 | chip_data = container_of(work, struct htcpld_chip, set_val_work); | |
252 | client = chip_data->client; | |
253 | i2c_smbus_read_byte_data(client, chip_data->cache_out); | |
254 | } | |
255 | ||
8d2d3a3a | 256 | static int htcpld_chip_get(struct gpio_chip *chip, unsigned offset) |
6048a3dd | 257 | { |
ed1c9b3c | 258 | struct htcpld_chip *chip_data = gpiochip_get_data(chip); |
9b6a5ad9 | 259 | u8 cache; |
6048a3dd | 260 | |
9b6a5ad9 | 261 | if (!strncmp(chip->label, "htcpld-out", 10)) { |
9b6a5ad9 LJ |
262 | cache = chip_data->cache_out; |
263 | } else if (!strncmp(chip->label, "htcpld-in", 9)) { | |
9b6a5ad9 LJ |
264 | cache = chip_data->cache_in; |
265 | } else | |
266 | return -EINVAL; | |
6048a3dd | 267 | |
9b6a5ad9 | 268 | return (cache >> offset) & 1; |
6048a3dd CM |
269 | } |
270 | ||
271 | static int htcpld_direction_output(struct gpio_chip *chip, | |
272 | unsigned offset, int value) | |
273 | { | |
274 | htcpld_chip_set(chip, offset, value); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int htcpld_direction_input(struct gpio_chip *chip, | |
279 | unsigned offset) | |
280 | { | |
281 | /* | |
282 | * No-op: this function can only be called on the input chip. | |
283 | * We do however make sure the offset is within range. | |
284 | */ | |
285 | return (offset < chip->ngpio) ? 0 : -EINVAL; | |
286 | } | |
287 | ||
8d2d3a3a | 288 | static int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset) |
6048a3dd | 289 | { |
ed1c9b3c | 290 | struct htcpld_chip *chip_data = gpiochip_get_data(chip); |
6048a3dd CM |
291 | |
292 | if (offset < chip_data->nirqs) | |
293 | return chip_data->irq_start + offset; | |
294 | else | |
295 | return -EINVAL; | |
296 | } | |
297 | ||
8d2d3a3a | 298 | static void htcpld_chip_reset(struct i2c_client *client) |
6048a3dd CM |
299 | { |
300 | struct htcpld_chip *chip_data = i2c_get_clientdata(client); | |
301 | if (!chip_data) | |
302 | return; | |
303 | ||
304 | i2c_smbus_read_byte_data( | |
305 | client, (chip_data->cache_out = chip_data->reset)); | |
306 | } | |
307 | ||
f791be49 | 308 | static int htcpld_setup_chip_irq( |
6048a3dd CM |
309 | struct platform_device *pdev, |
310 | int chip_index) | |
311 | { | |
312 | struct htcpld_data *htcpld; | |
6048a3dd | 313 | struct htcpld_chip *chip; |
6048a3dd | 314 | unsigned int irq, irq_end; |
6048a3dd CM |
315 | |
316 | /* Get the platform and driver data */ | |
6048a3dd CM |
317 | htcpld = platform_get_drvdata(pdev); |
318 | chip = &htcpld->chip[chip_index]; | |
6048a3dd CM |
319 | |
320 | /* Setup irq handlers */ | |
321 | irq_end = chip->irq_start + chip->nirqs; | |
322 | for (irq = chip->irq_start; irq < irq_end; irq++) { | |
d6f7ce9f TG |
323 | irq_set_chip_and_handler(irq, &htcpld_muxed_chip, |
324 | handle_simple_irq); | |
d5bb1221 | 325 | irq_set_chip_data(irq, chip); |
9bd09f34 | 326 | irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); |
6048a3dd CM |
327 | } |
328 | ||
a48baac5 | 329 | return 0; |
6048a3dd CM |
330 | } |
331 | ||
f791be49 | 332 | static int htcpld_register_chip_i2c( |
6048a3dd CM |
333 | struct platform_device *pdev, |
334 | int chip_index) | |
335 | { | |
336 | struct htcpld_data *htcpld; | |
337 | struct device *dev = &pdev->dev; | |
338 | struct htcpld_core_platform_data *pdata; | |
339 | struct htcpld_chip *chip; | |
340 | struct htcpld_chip_platform_data *plat_chip_data; | |
341 | struct i2c_adapter *adapter; | |
342 | struct i2c_client *client; | |
343 | struct i2c_board_info info; | |
344 | ||
345 | /* Get the platform and driver data */ | |
334a41ce | 346 | pdata = dev_get_platdata(dev); |
6048a3dd CM |
347 | htcpld = platform_get_drvdata(pdev); |
348 | chip = &htcpld->chip[chip_index]; | |
349 | plat_chip_data = &pdata->chip[chip_index]; | |
350 | ||
351 | adapter = i2c_get_adapter(pdata->i2c_adapter_id); | |
41cc08e9 | 352 | if (!adapter) { |
6048a3dd CM |
353 | /* Eek, no such I2C adapter! Bail out. */ |
354 | dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n", | |
355 | plat_chip_data->addr, pdata->i2c_adapter_id); | |
356 | return -ENODEV; | |
357 | } | |
358 | ||
359 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) { | |
360 | dev_warn(dev, "i2c adapter %d non-functional\n", | |
361 | pdata->i2c_adapter_id); | |
362 | return -EINVAL; | |
363 | } | |
364 | ||
365 | memset(&info, 0, sizeof(struct i2c_board_info)); | |
366 | info.addr = plat_chip_data->addr; | |
367 | strlcpy(info.type, "htcpld-chip", I2C_NAME_SIZE); | |
368 | info.platform_data = chip; | |
369 | ||
370 | /* Add the I2C device. This calls the probe() function. */ | |
371 | client = i2c_new_device(adapter, &info); | |
372 | if (!client) { | |
373 | /* I2C device registration failed, contineu with the next */ | |
374 | dev_warn(dev, "Unable to add I2C device for 0x%x\n", | |
375 | plat_chip_data->addr); | |
376 | return -ENODEV; | |
377 | } | |
378 | ||
379 | i2c_set_clientdata(client, chip); | |
6065c9a4 | 380 | snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%x", client->addr); |
6048a3dd CM |
381 | chip->client = client; |
382 | ||
383 | /* Reset the chip */ | |
384 | htcpld_chip_reset(client); | |
385 | chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
f791be49 | 390 | static void htcpld_unregister_chip_i2c( |
6048a3dd CM |
391 | struct platform_device *pdev, |
392 | int chip_index) | |
393 | { | |
394 | struct htcpld_data *htcpld; | |
395 | struct htcpld_chip *chip; | |
396 | ||
397 | /* Get the platform and driver data */ | |
398 | htcpld = platform_get_drvdata(pdev); | |
399 | chip = &htcpld->chip[chip_index]; | |
400 | ||
401 | if (chip->client) | |
402 | i2c_unregister_device(chip->client); | |
403 | } | |
404 | ||
f791be49 | 405 | static int htcpld_register_chip_gpio( |
6048a3dd CM |
406 | struct platform_device *pdev, |
407 | int chip_index) | |
408 | { | |
409 | struct htcpld_data *htcpld; | |
410 | struct device *dev = &pdev->dev; | |
411 | struct htcpld_core_platform_data *pdata; | |
412 | struct htcpld_chip *chip; | |
413 | struct htcpld_chip_platform_data *plat_chip_data; | |
414 | struct gpio_chip *gpio_chip; | |
415 | int ret = 0; | |
416 | ||
417 | /* Get the platform and driver data */ | |
334a41ce | 418 | pdata = dev_get_platdata(dev); |
6048a3dd CM |
419 | htcpld = platform_get_drvdata(pdev); |
420 | chip = &htcpld->chip[chip_index]; | |
421 | plat_chip_data = &pdata->chip[chip_index]; | |
422 | ||
423 | /* Setup the GPIO chips */ | |
424 | gpio_chip = &(chip->chip_out); | |
425 | gpio_chip->label = "htcpld-out"; | |
58383c78 | 426 | gpio_chip->parent = dev; |
6048a3dd CM |
427 | gpio_chip->owner = THIS_MODULE; |
428 | gpio_chip->get = htcpld_chip_get; | |
429 | gpio_chip->set = htcpld_chip_set; | |
430 | gpio_chip->direction_input = NULL; | |
431 | gpio_chip->direction_output = htcpld_direction_output; | |
432 | gpio_chip->base = plat_chip_data->gpio_out_base; | |
433 | gpio_chip->ngpio = plat_chip_data->num_gpios; | |
434 | ||
435 | gpio_chip = &(chip->chip_in); | |
436 | gpio_chip->label = "htcpld-in"; | |
58383c78 | 437 | gpio_chip->parent = dev; |
6048a3dd CM |
438 | gpio_chip->owner = THIS_MODULE; |
439 | gpio_chip->get = htcpld_chip_get; | |
440 | gpio_chip->set = NULL; | |
441 | gpio_chip->direction_input = htcpld_direction_input; | |
442 | gpio_chip->direction_output = NULL; | |
443 | gpio_chip->to_irq = htcpld_chip_to_irq; | |
444 | gpio_chip->base = plat_chip_data->gpio_in_base; | |
445 | gpio_chip->ngpio = plat_chip_data->num_gpios; | |
446 | ||
447 | /* Add the GPIO chips */ | |
ed1c9b3c | 448 | ret = gpiochip_add_data(&(chip->chip_out), chip); |
6048a3dd CM |
449 | if (ret) { |
450 | dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n", | |
451 | plat_chip_data->addr, ret); | |
452 | return ret; | |
453 | } | |
454 | ||
ed1c9b3c | 455 | ret = gpiochip_add_data(&(chip->chip_in), chip); |
6048a3dd | 456 | if (ret) { |
6048a3dd CM |
457 | dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n", |
458 | plat_chip_data->addr, ret); | |
88d5e520 | 459 | gpiochip_remove(&(chip->chip_out)); |
6048a3dd CM |
460 | return ret; |
461 | } | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
f791be49 | 466 | static int htcpld_setup_chips(struct platform_device *pdev) |
6048a3dd CM |
467 | { |
468 | struct htcpld_data *htcpld; | |
469 | struct device *dev = &pdev->dev; | |
470 | struct htcpld_core_platform_data *pdata; | |
471 | int i; | |
472 | ||
473 | /* Get the platform and driver data */ | |
334a41ce | 474 | pdata = dev_get_platdata(dev); |
6048a3dd CM |
475 | htcpld = platform_get_drvdata(pdev); |
476 | ||
477 | /* Setup each chip's output GPIOs */ | |
478 | htcpld->nchips = pdata->num_chip; | |
a86854d0 KC |
479 | htcpld->chip = devm_kcalloc(dev, |
480 | htcpld->nchips, | |
481 | sizeof(struct htcpld_chip), | |
2b0b5e2d | 482 | GFP_KERNEL); |
2e4d5494 | 483 | if (!htcpld->chip) |
6048a3dd | 484 | return -ENOMEM; |
6048a3dd CM |
485 | |
486 | /* Add the chips as best we can */ | |
487 | for (i = 0; i < htcpld->nchips; i++) { | |
488 | int ret; | |
489 | ||
490 | /* Setup the HTCPLD chips */ | |
491 | htcpld->chip[i].reset = pdata->chip[i].reset; | |
492 | htcpld->chip[i].cache_out = pdata->chip[i].reset; | |
493 | htcpld->chip[i].cache_in = 0; | |
494 | htcpld->chip[i].dev = dev; | |
495 | htcpld->chip[i].irq_start = pdata->chip[i].irq_base; | |
496 | htcpld->chip[i].nirqs = pdata->chip[i].num_irqs; | |
497 | ||
498 | INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni); | |
499 | spin_lock_init(&(htcpld->chip[i].lock)); | |
500 | ||
501 | /* Setup the interrupts for the chip */ | |
502 | if (htcpld->chained_irq) { | |
503 | ret = htcpld_setup_chip_irq(pdev, i); | |
504 | if (ret) | |
505 | continue; | |
506 | } | |
507 | ||
508 | /* Register the chip with I2C */ | |
509 | ret = htcpld_register_chip_i2c(pdev, i); | |
510 | if (ret) | |
511 | continue; | |
512 | ||
513 | ||
514 | /* Register the chips with the GPIO subsystem */ | |
515 | ret = htcpld_register_chip_gpio(pdev, i); | |
516 | if (ret) { | |
517 | /* Unregister the chip from i2c and continue */ | |
518 | htcpld_unregister_chip_i2c(pdev, i); | |
519 | continue; | |
520 | } | |
521 | ||
522 | dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr); | |
523 | } | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
f791be49 | 528 | static int htcpld_core_probe(struct platform_device *pdev) |
6048a3dd CM |
529 | { |
530 | struct htcpld_data *htcpld; | |
531 | struct device *dev = &pdev->dev; | |
532 | struct htcpld_core_platform_data *pdata; | |
533 | struct resource *res; | |
534 | int ret = 0; | |
535 | ||
536 | if (!dev) | |
537 | return -ENODEV; | |
538 | ||
334a41ce | 539 | pdata = dev_get_platdata(dev); |
6048a3dd CM |
540 | if (!pdata) { |
541 | dev_warn(dev, "Platform data not found for htcpld core!\n"); | |
542 | return -ENXIO; | |
543 | } | |
544 | ||
2b0b5e2d | 545 | htcpld = devm_kzalloc(dev, sizeof(struct htcpld_data), GFP_KERNEL); |
6048a3dd CM |
546 | if (!htcpld) |
547 | return -ENOMEM; | |
548 | ||
549 | /* Find chained irq */ | |
6048a3dd CM |
550 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
551 | if (res) { | |
552 | int flags; | |
553 | htcpld->chained_irq = res->start; | |
554 | ||
555 | /* Setup the chained interrupt handler */ | |
cea2cc73 FE |
556 | flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | |
557 | IRQF_ONESHOT; | |
6048a3dd CM |
558 | ret = request_threaded_irq(htcpld->chained_irq, |
559 | NULL, htcpld_handler, | |
560 | flags, pdev->name, htcpld); | |
561 | if (ret) { | |
562 | dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret); | |
2b0b5e2d | 563 | return ret; |
6048a3dd CM |
564 | } else |
565 | device_init_wakeup(dev, 0); | |
566 | } | |
567 | ||
568 | /* Set the driver data */ | |
569 | platform_set_drvdata(pdev, htcpld); | |
570 | ||
571 | /* Setup the htcpld chips */ | |
572 | ret = htcpld_setup_chips(pdev); | |
573 | if (ret) | |
2b0b5e2d | 574 | return ret; |
6048a3dd CM |
575 | |
576 | /* Request the GPIO(s) for the int reset and set them up */ | |
577 | if (pdata->int_reset_gpio_hi) { | |
578 | ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core"); | |
579 | if (ret) { | |
580 | /* | |
581 | * If it failed, that sucks, but we can probably | |
582 | * continue on without it. | |
583 | */ | |
584 | dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n"); | |
585 | htcpld->int_reset_gpio_hi = 0; | |
586 | } else { | |
587 | htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi; | |
588 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); | |
589 | } | |
590 | } | |
591 | ||
592 | if (pdata->int_reset_gpio_lo) { | |
593 | ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core"); | |
594 | if (ret) { | |
595 | /* | |
596 | * If it failed, that sucks, but we can probably | |
597 | * continue on without it. | |
598 | */ | |
599 | dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n"); | |
600 | htcpld->int_reset_gpio_lo = 0; | |
601 | } else { | |
602 | htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo; | |
603 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); | |
604 | } | |
605 | } | |
606 | ||
607 | dev_info(dev, "Initialized successfully\n"); | |
608 | return 0; | |
6048a3dd CM |
609 | } |
610 | ||
611 | /* The I2C Driver -- used internally */ | |
612 | static const struct i2c_device_id htcpld_chip_id[] = { | |
613 | { "htcpld-chip", 0 }, | |
614 | { } | |
615 | }; | |
6048a3dd CM |
616 | |
617 | static struct i2c_driver htcpld_chip_driver = { | |
618 | .driver = { | |
619 | .name = "htcpld-chip", | |
620 | }, | |
621 | .id_table = htcpld_chip_id, | |
622 | }; | |
623 | ||
624 | /* The Core Driver */ | |
625 | static struct platform_driver htcpld_core_driver = { | |
626 | .driver = { | |
627 | .name = "i2c-htcpld", | |
628 | }, | |
629 | }; | |
630 | ||
631 | static int __init htcpld_core_init(void) | |
632 | { | |
633 | int ret; | |
634 | ||
635 | /* Register the I2C Chip driver */ | |
636 | ret = i2c_add_driver(&htcpld_chip_driver); | |
637 | if (ret) | |
638 | return ret; | |
639 | ||
640 | /* Probe for our chips */ | |
641 | return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe); | |
642 | } | |
11165223 | 643 | device_initcall(htcpld_core_init); |