Timo Kokkonen | c332e84 | 2012-08-10 06:16:36 -0300 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Nokia Corporation |
| 3 | * |
| 4 | * Based on lirc_serial.c |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/uaccess.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/sched.h> |
| 27 | #include <linux/wait.h> |
| 28 | |
| 29 | #include <plat/dmtimer.h> |
| 30 | #include <plat/clock.h> |
Timo Kokkonen | c332e84 | 2012-08-10 06:16:36 -0300 | [diff] [blame] | 31 | |
| 32 | #include <media/lirc.h> |
| 33 | #include <media/lirc_dev.h> |
| 34 | #include <media/ir-rx51.h> |
| 35 | |
| 36 | #define LIRC_RX51_DRIVER_FEATURES (LIRC_CAN_SET_SEND_DUTY_CYCLE | \ |
| 37 | LIRC_CAN_SET_SEND_CARRIER | \ |
| 38 | LIRC_CAN_SEND_PULSE) |
| 39 | |
| 40 | #define DRIVER_NAME "lirc_rx51" |
| 41 | |
| 42 | #define WBUF_LEN 256 |
| 43 | |
| 44 | #define TIMER_MAX_VALUE 0xffffffff |
| 45 | |
| 46 | struct lirc_rx51 { |
| 47 | struct omap_dm_timer *pwm_timer; |
| 48 | struct omap_dm_timer *pulse_timer; |
| 49 | struct device *dev; |
| 50 | struct lirc_rx51_platform_data *pdata; |
| 51 | wait_queue_head_t wqueue; |
| 52 | |
| 53 | unsigned long fclk_khz; |
| 54 | unsigned int freq; /* carrier frequency */ |
| 55 | unsigned int duty_cycle; /* carrier duty cycle */ |
| 56 | unsigned int irq_num; |
| 57 | unsigned int match; |
| 58 | int wbuf[WBUF_LEN]; |
| 59 | int wbuf_index; |
| 60 | unsigned long device_is_open; |
Timo Kokkonen | 362b29b | 2012-08-30 13:54:25 -0300 | [diff] [blame] | 61 | int pwm_timer_num; |
Timo Kokkonen | c332e84 | 2012-08-10 06:16:36 -0300 | [diff] [blame] | 62 | }; |
| 63 | |
| 64 | static void lirc_rx51_on(struct lirc_rx51 *lirc_rx51) |
| 65 | { |
| 66 | omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1, |
| 67 | OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE); |
| 68 | } |
| 69 | |
| 70 | static void lirc_rx51_off(struct lirc_rx51 *lirc_rx51) |
| 71 | { |
| 72 | omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1, |
| 73 | OMAP_TIMER_TRIGGER_NONE); |
| 74 | } |
| 75 | |
| 76 | static int init_timing_params(struct lirc_rx51 *lirc_rx51) |
| 77 | { |
| 78 | u32 load, match; |
| 79 | |
| 80 | load = -(lirc_rx51->fclk_khz * 1000 / lirc_rx51->freq); |
| 81 | match = -(lirc_rx51->duty_cycle * -load / 100); |
| 82 | omap_dm_timer_set_load(lirc_rx51->pwm_timer, 1, load); |
| 83 | omap_dm_timer_set_match(lirc_rx51->pwm_timer, 1, match); |
| 84 | omap_dm_timer_write_counter(lirc_rx51->pwm_timer, TIMER_MAX_VALUE - 2); |
| 85 | omap_dm_timer_start(lirc_rx51->pwm_timer); |
| 86 | omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0); |
| 87 | omap_dm_timer_start(lirc_rx51->pulse_timer); |
| 88 | |
| 89 | lirc_rx51->match = 0; |
| 90 | |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | #define tics_after(a, b) ((long)(b) - (long)(a) < 0) |
| 95 | |
| 96 | static int pulse_timer_set_timeout(struct lirc_rx51 *lirc_rx51, int usec) |
| 97 | { |
| 98 | int counter; |
| 99 | |
| 100 | BUG_ON(usec < 0); |
| 101 | |
| 102 | if (lirc_rx51->match == 0) |
| 103 | counter = omap_dm_timer_read_counter(lirc_rx51->pulse_timer); |
| 104 | else |
| 105 | counter = lirc_rx51->match; |
| 106 | |
| 107 | counter += (u32)(lirc_rx51->fclk_khz * usec / (1000)); |
| 108 | omap_dm_timer_set_match(lirc_rx51->pulse_timer, 1, counter); |
| 109 | omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, |
| 110 | OMAP_TIMER_INT_MATCH); |
| 111 | if (tics_after(omap_dm_timer_read_counter(lirc_rx51->pulse_timer), |
| 112 | counter)) { |
| 113 | return 1; |
| 114 | } |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static irqreturn_t lirc_rx51_interrupt_handler(int irq, void *ptr) |
| 119 | { |
| 120 | unsigned int retval; |
| 121 | struct lirc_rx51 *lirc_rx51 = ptr; |
| 122 | |
| 123 | retval = omap_dm_timer_read_status(lirc_rx51->pulse_timer); |
| 124 | if (!retval) |
| 125 | return IRQ_NONE; |
| 126 | |
Timo Kokkonen | 362b29b | 2012-08-30 13:54:25 -0300 | [diff] [blame] | 127 | if (retval & ~OMAP_TIMER_INT_MATCH) |
Timo Kokkonen | c332e84 | 2012-08-10 06:16:36 -0300 | [diff] [blame] | 128 | dev_err_ratelimited(lirc_rx51->dev, |
| 129 | ": Unexpected interrupt source: %x\n", retval); |
| 130 | |
Timo Kokkonen | 362b29b | 2012-08-30 13:54:25 -0300 | [diff] [blame] | 131 | omap_dm_timer_write_status(lirc_rx51->pulse_timer, |
| 132 | OMAP_TIMER_INT_MATCH | |
| 133 | OMAP_TIMER_INT_OVERFLOW | |
| 134 | OMAP_TIMER_INT_CAPTURE); |
Timo Kokkonen | c332e84 | 2012-08-10 06:16:36 -0300 | [diff] [blame] | 135 | if (lirc_rx51->wbuf_index < 0) { |
| 136 | dev_err_ratelimited(lirc_rx51->dev, |
| 137 | ": BUG wbuf_index has value of %i\n", |
| 138 | lirc_rx51->wbuf_index); |
| 139 | goto end; |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * If we happen to hit an odd latency spike, loop through the |
| 144 | * pulses until we catch up. |
| 145 | */ |
| 146 | do { |
| 147 | if (lirc_rx51->wbuf_index >= WBUF_LEN) |
| 148 | goto end; |
| 149 | if (lirc_rx51->wbuf[lirc_rx51->wbuf_index] == -1) |
| 150 | goto end; |
| 151 | |
| 152 | if (lirc_rx51->wbuf_index % 2) |
| 153 | lirc_rx51_off(lirc_rx51); |
| 154 | else |
| 155 | lirc_rx51_on(lirc_rx51); |
| 156 | |
| 157 | retval = pulse_timer_set_timeout(lirc_rx51, |
| 158 | lirc_rx51->wbuf[lirc_rx51->wbuf_index]); |
| 159 | lirc_rx51->wbuf_index++; |
| 160 | |
| 161 | } while (retval); |
| 162 | |
| 163 | return IRQ_HANDLED; |
| 164 | end: |
| 165 | /* Stop TX here */ |
| 166 | lirc_rx51_off(lirc_rx51); |
| 167 | lirc_rx51->wbuf_index = -1; |
| 168 | omap_dm_timer_stop(lirc_rx51->pwm_timer); |
| 169 | omap_dm_timer_stop(lirc_rx51->pulse_timer); |
| 170 | omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0); |
| 171 | wake_up_interruptible(&lirc_rx51->wqueue); |
| 172 | |
| 173 | return IRQ_HANDLED; |
| 174 | } |
| 175 | |
| 176 | static int lirc_rx51_init_port(struct lirc_rx51 *lirc_rx51) |
| 177 | { |
| 178 | struct clk *clk_fclk; |
| 179 | int retval, pwm_timer = lirc_rx51->pwm_timer_num; |
| 180 | |
| 181 | lirc_rx51->pwm_timer = omap_dm_timer_request_specific(pwm_timer); |
| 182 | if (lirc_rx51->pwm_timer == NULL) { |
| 183 | dev_err(lirc_rx51->dev, ": Error requesting GPT%d timer\n", |
| 184 | pwm_timer); |
| 185 | return -EBUSY; |
| 186 | } |
| 187 | |
| 188 | lirc_rx51->pulse_timer = omap_dm_timer_request(); |
| 189 | if (lirc_rx51->pulse_timer == NULL) { |
| 190 | dev_err(lirc_rx51->dev, ": Error requesting pulse timer\n"); |
| 191 | retval = -EBUSY; |
| 192 | goto err1; |
| 193 | } |
| 194 | |
| 195 | omap_dm_timer_set_source(lirc_rx51->pwm_timer, OMAP_TIMER_SRC_SYS_CLK); |
| 196 | omap_dm_timer_set_source(lirc_rx51->pulse_timer, |
| 197 | OMAP_TIMER_SRC_SYS_CLK); |
| 198 | |
| 199 | omap_dm_timer_enable(lirc_rx51->pwm_timer); |
| 200 | omap_dm_timer_enable(lirc_rx51->pulse_timer); |
| 201 | |
| 202 | lirc_rx51->irq_num = omap_dm_timer_get_irq(lirc_rx51->pulse_timer); |
| 203 | retval = request_irq(lirc_rx51->irq_num, lirc_rx51_interrupt_handler, |
| 204 | IRQF_DISABLED | IRQF_SHARED, |
| 205 | "lirc_pulse_timer", lirc_rx51); |
| 206 | if (retval) { |
| 207 | dev_err(lirc_rx51->dev, ": Failed to request interrupt line\n"); |
| 208 | goto err2; |
| 209 | } |
| 210 | |
| 211 | clk_fclk = omap_dm_timer_get_fclk(lirc_rx51->pwm_timer); |
| 212 | lirc_rx51->fclk_khz = clk_fclk->rate / 1000; |
| 213 | |
| 214 | return 0; |
| 215 | |
| 216 | err2: |
| 217 | omap_dm_timer_free(lirc_rx51->pulse_timer); |
| 218 | err1: |
| 219 | omap_dm_timer_free(lirc_rx51->pwm_timer); |
| 220 | |
| 221 | return retval; |
| 222 | } |
| 223 | |
| 224 | static int lirc_rx51_free_port(struct lirc_rx51 *lirc_rx51) |
| 225 | { |
| 226 | omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0); |
| 227 | free_irq(lirc_rx51->irq_num, lirc_rx51); |
| 228 | lirc_rx51_off(lirc_rx51); |
| 229 | omap_dm_timer_disable(lirc_rx51->pwm_timer); |
| 230 | omap_dm_timer_disable(lirc_rx51->pulse_timer); |
| 231 | omap_dm_timer_free(lirc_rx51->pwm_timer); |
| 232 | omap_dm_timer_free(lirc_rx51->pulse_timer); |
| 233 | lirc_rx51->wbuf_index = -1; |
| 234 | |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | static ssize_t lirc_rx51_write(struct file *file, const char *buf, |
| 239 | size_t n, loff_t *ppos) |
| 240 | { |
| 241 | int count, i; |
| 242 | struct lirc_rx51 *lirc_rx51 = file->private_data; |
| 243 | |
| 244 | if (n % sizeof(int)) |
| 245 | return -EINVAL; |
| 246 | |
| 247 | count = n / sizeof(int); |
| 248 | if ((count > WBUF_LEN) || (count % 2 == 0)) |
| 249 | return -EINVAL; |
| 250 | |
| 251 | /* Wait any pending transfers to finish */ |
| 252 | wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0); |
| 253 | |
| 254 | if (copy_from_user(lirc_rx51->wbuf, buf, n)) |
| 255 | return -EFAULT; |
| 256 | |
| 257 | /* Sanity check the input pulses */ |
| 258 | for (i = 0; i < count; i++) |
| 259 | if (lirc_rx51->wbuf[i] < 0) |
| 260 | return -EINVAL; |
| 261 | |
| 262 | init_timing_params(lirc_rx51); |
| 263 | if (count < WBUF_LEN) |
| 264 | lirc_rx51->wbuf[count] = -1; /* Insert termination mark */ |
| 265 | |
| 266 | /* |
| 267 | * Adjust latency requirements so the device doesn't go in too |
| 268 | * deep sleep states |
| 269 | */ |
| 270 | lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, 50); |
| 271 | |
| 272 | lirc_rx51_on(lirc_rx51); |
| 273 | lirc_rx51->wbuf_index = 1; |
| 274 | pulse_timer_set_timeout(lirc_rx51, lirc_rx51->wbuf[0]); |
| 275 | |
| 276 | /* |
| 277 | * Don't return back to the userspace until the transfer has |
| 278 | * finished |
| 279 | */ |
| 280 | wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0); |
| 281 | |
| 282 | /* We can sleep again */ |
| 283 | lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, -1); |
| 284 | |
| 285 | return n; |
| 286 | } |
| 287 | |
| 288 | static long lirc_rx51_ioctl(struct file *filep, |
| 289 | unsigned int cmd, unsigned long arg) |
| 290 | { |
| 291 | int result; |
| 292 | unsigned long value; |
| 293 | unsigned int ivalue; |
| 294 | struct lirc_rx51 *lirc_rx51 = filep->private_data; |
| 295 | |
| 296 | switch (cmd) { |
| 297 | case LIRC_GET_SEND_MODE: |
| 298 | result = put_user(LIRC_MODE_PULSE, (unsigned long *)arg); |
| 299 | if (result) |
| 300 | return result; |
| 301 | break; |
| 302 | |
| 303 | case LIRC_SET_SEND_MODE: |
| 304 | result = get_user(value, (unsigned long *)arg); |
| 305 | if (result) |
| 306 | return result; |
| 307 | |
| 308 | /* only LIRC_MODE_PULSE supported */ |
| 309 | if (value != LIRC_MODE_PULSE) |
| 310 | return -ENOSYS; |
| 311 | break; |
| 312 | |
| 313 | case LIRC_GET_REC_MODE: |
| 314 | result = put_user(0, (unsigned long *) arg); |
| 315 | if (result) |
| 316 | return result; |
| 317 | break; |
| 318 | |
| 319 | case LIRC_GET_LENGTH: |
| 320 | return -ENOSYS; |
| 321 | break; |
| 322 | |
| 323 | case LIRC_SET_SEND_DUTY_CYCLE: |
| 324 | result = get_user(ivalue, (unsigned int *) arg); |
| 325 | if (result) |
| 326 | return result; |
| 327 | |
| 328 | if (ivalue <= 0 || ivalue > 100) { |
| 329 | dev_err(lirc_rx51->dev, ": invalid duty cycle %d\n", |
| 330 | ivalue); |
| 331 | return -EINVAL; |
| 332 | } |
| 333 | |
| 334 | lirc_rx51->duty_cycle = ivalue; |
| 335 | break; |
| 336 | |
| 337 | case LIRC_SET_SEND_CARRIER: |
| 338 | result = get_user(ivalue, (unsigned int *) arg); |
| 339 | if (result) |
| 340 | return result; |
| 341 | |
| 342 | if (ivalue > 500000 || ivalue < 20000) { |
| 343 | dev_err(lirc_rx51->dev, ": invalid carrier freq %d\n", |
| 344 | ivalue); |
| 345 | return -EINVAL; |
| 346 | } |
| 347 | |
| 348 | lirc_rx51->freq = ivalue; |
| 349 | break; |
| 350 | |
| 351 | case LIRC_GET_FEATURES: |
| 352 | result = put_user(LIRC_RX51_DRIVER_FEATURES, |
| 353 | (unsigned long *) arg); |
| 354 | if (result) |
| 355 | return result; |
| 356 | break; |
| 357 | |
| 358 | default: |
| 359 | return -ENOIOCTLCMD; |
| 360 | } |
| 361 | |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | static int lirc_rx51_open(struct inode *inode, struct file *file) |
| 366 | { |
| 367 | struct lirc_rx51 *lirc_rx51 = lirc_get_pdata(file); |
| 368 | BUG_ON(!lirc_rx51); |
| 369 | |
| 370 | file->private_data = lirc_rx51; |
| 371 | |
| 372 | if (test_and_set_bit(1, &lirc_rx51->device_is_open)) |
| 373 | return -EBUSY; |
| 374 | |
| 375 | return lirc_rx51_init_port(lirc_rx51); |
| 376 | } |
| 377 | |
| 378 | static int lirc_rx51_release(struct inode *inode, struct file *file) |
| 379 | { |
| 380 | struct lirc_rx51 *lirc_rx51 = file->private_data; |
| 381 | |
| 382 | lirc_rx51_free_port(lirc_rx51); |
| 383 | |
| 384 | clear_bit(1, &lirc_rx51->device_is_open); |
| 385 | |
| 386 | return 0; |
| 387 | } |
| 388 | |
| 389 | static struct lirc_rx51 lirc_rx51 = { |
| 390 | .freq = 38000, |
| 391 | .duty_cycle = 50, |
| 392 | .wbuf_index = -1, |
| 393 | }; |
| 394 | |
| 395 | static const struct file_operations lirc_fops = { |
| 396 | .owner = THIS_MODULE, |
| 397 | .write = lirc_rx51_write, |
| 398 | .unlocked_ioctl = lirc_rx51_ioctl, |
| 399 | .read = lirc_dev_fop_read, |
| 400 | .poll = lirc_dev_fop_poll, |
| 401 | .open = lirc_rx51_open, |
| 402 | .release = lirc_rx51_release, |
| 403 | }; |
| 404 | |
| 405 | static struct lirc_driver lirc_rx51_driver = { |
| 406 | .name = DRIVER_NAME, |
| 407 | .minor = -1, |
| 408 | .code_length = 1, |
| 409 | .data = &lirc_rx51, |
| 410 | .fops = &lirc_fops, |
| 411 | .owner = THIS_MODULE, |
| 412 | }; |
| 413 | |
| 414 | #ifdef CONFIG_PM |
| 415 | |
| 416 | static int lirc_rx51_suspend(struct platform_device *dev, pm_message_t state) |
| 417 | { |
| 418 | /* |
| 419 | * In case the device is still open, do not suspend. Normally |
| 420 | * this should not be a problem as lircd only keeps the device |
| 421 | * open only for short periods of time. We also don't want to |
| 422 | * get involved with race conditions that might happen if we |
| 423 | * were in a middle of a transmit. Thus, we defer any suspend |
| 424 | * actions until transmit has completed. |
| 425 | */ |
| 426 | if (test_and_set_bit(1, &lirc_rx51.device_is_open)) |
| 427 | return -EAGAIN; |
| 428 | |
| 429 | clear_bit(1, &lirc_rx51.device_is_open); |
| 430 | |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | static int lirc_rx51_resume(struct platform_device *dev) |
| 435 | { |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | #else |
| 440 | |
| 441 | #define lirc_rx51_suspend NULL |
| 442 | #define lirc_rx51_resume NULL |
| 443 | |
| 444 | #endif /* CONFIG_PM */ |
| 445 | |
| 446 | static int __devinit lirc_rx51_probe(struct platform_device *dev) |
| 447 | { |
| 448 | lirc_rx51_driver.features = LIRC_RX51_DRIVER_FEATURES; |
| 449 | lirc_rx51.pdata = dev->dev.platform_data; |
| 450 | lirc_rx51.pwm_timer_num = lirc_rx51.pdata->pwm_timer; |
| 451 | lirc_rx51.dev = &dev->dev; |
| 452 | lirc_rx51_driver.dev = &dev->dev; |
| 453 | lirc_rx51_driver.minor = lirc_register_driver(&lirc_rx51_driver); |
| 454 | init_waitqueue_head(&lirc_rx51.wqueue); |
| 455 | |
| 456 | if (lirc_rx51_driver.minor < 0) { |
| 457 | dev_err(lirc_rx51.dev, ": lirc_register_driver failed: %d\n", |
| 458 | lirc_rx51_driver.minor); |
| 459 | return lirc_rx51_driver.minor; |
| 460 | } |
| 461 | dev_info(lirc_rx51.dev, "registration ok, minor: %d, pwm: %d\n", |
| 462 | lirc_rx51_driver.minor, lirc_rx51.pwm_timer_num); |
| 463 | |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | static int __exit lirc_rx51_remove(struct platform_device *dev) |
| 468 | { |
| 469 | return lirc_unregister_driver(lirc_rx51_driver.minor); |
| 470 | } |
| 471 | |
| 472 | struct platform_driver lirc_rx51_platform_driver = { |
| 473 | .probe = lirc_rx51_probe, |
| 474 | .remove = __exit_p(lirc_rx51_remove), |
| 475 | .suspend = lirc_rx51_suspend, |
| 476 | .resume = lirc_rx51_resume, |
Timo Kokkonen | c332e84 | 2012-08-10 06:16:36 -0300 | [diff] [blame] | 477 | .driver = { |
| 478 | .name = DRIVER_NAME, |
| 479 | .owner = THIS_MODULE, |
| 480 | }, |
| 481 | }; |
| 482 | |
| 483 | static int __init lirc_rx51_init(void) |
| 484 | { |
| 485 | return platform_driver_register(&lirc_rx51_platform_driver); |
| 486 | } |
| 487 | module_init(lirc_rx51_init); |
| 488 | |
| 489 | static void __exit lirc_rx51_exit(void) |
| 490 | { |
| 491 | platform_driver_unregister(&lirc_rx51_platform_driver); |
| 492 | } |
| 493 | module_exit(lirc_rx51_exit); |
| 494 | |
| 495 | MODULE_DESCRIPTION("LIRC TX driver for Nokia RX51"); |
| 496 | MODULE_AUTHOR("Nokia Corporation"); |
| 497 | MODULE_LICENSE("GPL"); |