Blame view
drivers/rtc/rtc-wm8350.c
12.1 KB
077eaf5b4 rtc: rtc-wm8350: ... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 |
/* * Real Time Clock driver for Wolfson Microelectronics WM8350 * * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC. * * Author: Liam Girdwood * linux@wolfsonmicro.com * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/time.h> #include <linux/rtc.h> #include <linux/bcd.h> #include <linux/interrupt.h> #include <linux/ioctl.h> #include <linux/completion.h> #include <linux/mfd/wm8350/rtc.h> #include <linux/mfd/wm8350/core.h> #include <linux/delay.h> #include <linux/platform_device.h> #define WM8350_SET_ALM_RETRIES 5 #define WM8350_SET_TIME_RETRIES 5 #define WM8350_GET_TIME_RETRIES 5 #define to_wm8350_from_rtc_dev(d) container_of(d, struct wm8350, rtc.pdev.dev) /* * Read current time and date in RTC */ static int wm8350_rtc_readtime(struct device *dev, struct rtc_time *tm) { struct wm8350 *wm8350 = dev_get_drvdata(dev); u16 time1[4], time2[4]; int retries = WM8350_GET_TIME_RETRIES, ret; /* * Read the time twice and compare. * If time1 == time2, then time is valid else retry. */ do { ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time1); if (ret < 0) return ret; ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time2); if (ret < 0) return ret; if (memcmp(time1, time2, sizeof(time1)) == 0) { tm->tm_sec = time1[0] & WM8350_RTC_SECS_MASK; tm->tm_min = (time1[0] & WM8350_RTC_MINS_MASK) >> WM8350_RTC_MINS_SHIFT; tm->tm_hour = time1[1] & WM8350_RTC_HRS_MASK; tm->tm_wday = ((time1[1] >> WM8350_RTC_DAY_SHIFT) & 0x7) - 1; tm->tm_mon = ((time1[2] & WM8350_RTC_MTH_MASK) >> WM8350_RTC_MTH_SHIFT) - 1; tm->tm_mday = (time1[2] & WM8350_RTC_DATE_MASK); tm->tm_year = ((time1[3] & WM8350_RTC_YHUNDREDS_MASK) >> WM8350_RTC_YHUNDREDS_SHIFT) * 100; tm->tm_year += time1[3] & WM8350_RTC_YUNITS_MASK; tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); tm->tm_year -= 1900; dev_dbg(dev, "Read (%d left): %04x %04x %04x %04x ", retries, time1[0], time1[1], time1[2], time1[3]); return 0; } } while (retries--); dev_err(dev, "timed out reading RTC time "); return -EIO; } /* * Set current time and date in RTC */ static int wm8350_rtc_settime(struct device *dev, struct rtc_time *tm) { struct wm8350 *wm8350 = dev_get_drvdata(dev); u16 time[4]; u16 rtc_ctrl; int ret, retries = WM8350_SET_TIME_RETRIES; time[0] = tm->tm_sec; time[0] |= tm->tm_min << WM8350_RTC_MINS_SHIFT; time[1] = tm->tm_hour; time[1] |= (tm->tm_wday + 1) << WM8350_RTC_DAY_SHIFT; time[2] = tm->tm_mday; time[2] |= (tm->tm_mon + 1) << WM8350_RTC_MTH_SHIFT; time[3] = ((tm->tm_year + 1900) / 100) << WM8350_RTC_YHUNDREDS_SHIFT; time[3] |= (tm->tm_year + 1900) % 100; dev_dbg(dev, "Setting: %04x %04x %04x %04x ", time[0], time[1], time[2], time[3]); /* Set RTC_SET to stop the clock */ ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET); if (ret < 0) return ret; /* Wait until confirmation of stopping */ do { rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL); schedule_timeout_uninterruptible(msecs_to_jiffies(1)); |
62da659a7 rtc-wm8350: retri... |
128 |
} while (--retries && !(rtc_ctrl & WM8350_RTC_STS)); |
077eaf5b4 rtc: rtc-wm8350: ... |
129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 |
if (!retries) { dev_err(dev, "timed out on set confirmation "); return -EIO; } /* Write time to RTC */ ret = wm8350_block_write(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time); if (ret < 0) return ret; /* Clear RTC_SET to start the clock */ ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET); return ret; } /* * Read alarm time and date in RTC */ static int wm8350_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) { struct wm8350 *wm8350 = dev_get_drvdata(dev); struct rtc_time *tm = &alrm->time; u16 time[4]; int ret; ret = wm8350_block_read(wm8350, WM8350_ALARM_SECONDS_MINUTES, 4, time); if (ret < 0) return ret; tm->tm_sec = time[0] & WM8350_RTC_ALMSECS_MASK; if (tm->tm_sec == WM8350_RTC_ALMSECS_MASK) tm->tm_sec = -1; tm->tm_min = time[0] & WM8350_RTC_ALMMINS_MASK; if (tm->tm_min == WM8350_RTC_ALMMINS_MASK) tm->tm_min = -1; else tm->tm_min >>= WM8350_RTC_ALMMINS_SHIFT; tm->tm_hour = time[1] & WM8350_RTC_ALMHRS_MASK; if (tm->tm_hour == WM8350_RTC_ALMHRS_MASK) tm->tm_hour = -1; tm->tm_wday = ((time[1] >> WM8350_RTC_ALMDAY_SHIFT) & 0x7) - 1; if (tm->tm_wday > 7) tm->tm_wday = -1; tm->tm_mon = time[2] & WM8350_RTC_ALMMTH_MASK; if (tm->tm_mon == WM8350_RTC_ALMMTH_MASK) tm->tm_mon = -1; else tm->tm_mon = (tm->tm_mon >> WM8350_RTC_ALMMTH_SHIFT) - 1; tm->tm_mday = (time[2] & WM8350_RTC_ALMDATE_MASK); if (tm->tm_mday == WM8350_RTC_ALMDATE_MASK) tm->tm_mday = -1; tm->tm_year = -1; alrm->enabled = !(time[3] & WM8350_RTC_ALMSTS); return 0; } static int wm8350_rtc_stop_alarm(struct wm8350 *wm8350) { int retries = WM8350_SET_ALM_RETRIES; u16 rtc_ctrl; int ret; /* Set RTC_SET to stop the clock */ ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_ALMSET); if (ret < 0) return ret; /* Wait until confirmation of stopping */ do { rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL); schedule_timeout_uninterruptible(msecs_to_jiffies(1)); } while (retries-- && !(rtc_ctrl & WM8350_RTC_ALMSTS)); if (!(rtc_ctrl & WM8350_RTC_ALMSTS)) return -ETIMEDOUT; return 0; } static int wm8350_rtc_start_alarm(struct wm8350 *wm8350) { int ret; int retries = WM8350_SET_ALM_RETRIES; u16 rtc_ctrl; ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_ALMSET); if (ret < 0) return ret; /* Wait until confirmation */ do { rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL); schedule_timeout_uninterruptible(msecs_to_jiffies(1)); } while (retries-- && rtc_ctrl & WM8350_RTC_ALMSTS); if (rtc_ctrl & WM8350_RTC_ALMSTS) return -ETIMEDOUT; return 0; } |
47367a3ba rtc: convert wm83... |
242 243 244 245 246 247 248 249 250 251 |
static int wm8350_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct wm8350 *wm8350 = dev_get_drvdata(dev); if (enabled) return wm8350_rtc_start_alarm(wm8350); else return wm8350_rtc_stop_alarm(wm8350); } |
077eaf5b4 rtc: rtc-wm8350: ... |
252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 |
static int wm8350_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) { struct wm8350 *wm8350 = dev_get_drvdata(dev); struct rtc_time *tm = &alrm->time; u16 time[3]; int ret; memset(time, 0, sizeof(time)); if (tm->tm_sec != -1) time[0] |= tm->tm_sec; else time[0] |= WM8350_RTC_ALMSECS_MASK; if (tm->tm_min != -1) time[0] |= tm->tm_min << WM8350_RTC_ALMMINS_SHIFT; else time[0] |= WM8350_RTC_ALMMINS_MASK; if (tm->tm_hour != -1) time[1] |= tm->tm_hour; else time[1] |= WM8350_RTC_ALMHRS_MASK; if (tm->tm_wday != -1) time[1] |= (tm->tm_wday + 1) << WM8350_RTC_ALMDAY_SHIFT; else time[1] |= WM8350_RTC_ALMDAY_MASK; if (tm->tm_mday != -1) time[2] |= tm->tm_mday; else time[2] |= WM8350_RTC_ALMDATE_MASK; if (tm->tm_mon != -1) time[2] |= (tm->tm_mon + 1) << WM8350_RTC_ALMMTH_SHIFT; else time[2] |= WM8350_RTC_ALMMTH_MASK; ret = wm8350_rtc_stop_alarm(wm8350); if (ret < 0) return ret; /* Write time to RTC */ ret = wm8350_block_write(wm8350, WM8350_ALARM_SECONDS_MINUTES, 3, time); if (ret < 0) return ret; if (alrm->enabled) ret = wm8350_rtc_start_alarm(wm8350); return ret; } |
5a65edbc1 mfd: Convert wm83... |
306 |
static irqreturn_t wm8350_rtc_alarm_handler(int irq, void *data) |
077eaf5b4 rtc: rtc-wm8350: ... |
307 |
{ |
5a65edbc1 mfd: Convert wm83... |
308 |
struct wm8350 *wm8350 = data; |
077eaf5b4 rtc: rtc-wm8350: ... |
309 310 311 312 313 314 315 316 317 318 319 320 321 |
struct rtc_device *rtc = wm8350->rtc.rtc; int ret; rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF); /* Make it one shot */ ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_ALMSET); if (ret != 0) { dev_err(&(wm8350->rtc.pdev->dev), "Failed to disable alarm: %d ", ret); } |
5a65edbc1 mfd: Convert wm83... |
322 323 |
return IRQ_HANDLED; |
077eaf5b4 rtc: rtc-wm8350: ... |
324 |
} |
5a65edbc1 mfd: Convert wm83... |
325 |
static irqreturn_t wm8350_rtc_update_handler(int irq, void *data) |
077eaf5b4 rtc: rtc-wm8350: ... |
326 |
{ |
5a65edbc1 mfd: Convert wm83... |
327 |
struct wm8350 *wm8350 = data; |
077eaf5b4 rtc: rtc-wm8350: ... |
328 329 330 |
struct rtc_device *rtc = wm8350->rtc.rtc; rtc_update_irq(rtc, 1, RTC_IRQF | RTC_UF); |
5a65edbc1 mfd: Convert wm83... |
331 332 |
return IRQ_HANDLED; |
077eaf5b4 rtc: rtc-wm8350: ... |
333 334 335 |
} static const struct rtc_class_ops wm8350_rtc_ops = { |
077eaf5b4 rtc: rtc-wm8350: ... |
336 337 338 339 |
.read_time = wm8350_rtc_readtime, .set_time = wm8350_rtc_settime, .read_alarm = wm8350_rtc_readalarm, .set_alarm = wm8350_rtc_setalarm, |
47367a3ba rtc: convert wm83... |
340 |
.alarm_irq_enable = wm8350_rtc_alarm_irq_enable, |
077eaf5b4 rtc: rtc-wm8350: ... |
341 342 343 |
}; #ifdef CONFIG_PM |
6f38b0436 rtc: convert WM83... |
344 |
static int wm8350_rtc_suspend(struct device *dev) |
077eaf5b4 rtc: rtc-wm8350: ... |
345 |
{ |
6f38b0436 rtc: convert WM83... |
346 |
struct platform_device *pdev = to_platform_device(dev); |
077eaf5b4 rtc: rtc-wm8350: ... |
347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 |
struct wm8350 *wm8350 = dev_get_drvdata(&pdev->dev); int ret = 0; u16 reg; reg = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL); if (device_may_wakeup(&wm8350->rtc.pdev->dev) && reg & WM8350_RTC_ALMSTS) { ret = wm8350_rtc_stop_alarm(wm8350); if (ret != 0) dev_err(&pdev->dev, "Failed to stop RTC alarm: %d ", ret); } return ret; } |
6f38b0436 rtc: convert WM83... |
364 |
static int wm8350_rtc_resume(struct device *dev) |
077eaf5b4 rtc: rtc-wm8350: ... |
365 |
{ |
6f38b0436 rtc: convert WM83... |
366 |
struct platform_device *pdev = to_platform_device(dev); |
077eaf5b4 rtc: rtc-wm8350: ... |
367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 |
struct wm8350 *wm8350 = dev_get_drvdata(&pdev->dev); int ret; if (wm8350->rtc.alarm_enabled) { ret = wm8350_rtc_start_alarm(wm8350); if (ret != 0) dev_err(&pdev->dev, "Failed to restart RTC alarm: %d ", ret); } return 0; } #else #define wm8350_rtc_suspend NULL #define wm8350_rtc_resume NULL #endif static int wm8350_rtc_probe(struct platform_device *pdev) { struct wm8350 *wm8350 = platform_get_drvdata(pdev); struct wm8350_rtc *wm_rtc = &wm8350->rtc; int ret = 0; u16 timectl, power5; timectl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL); if (timectl & WM8350_RTC_BCD) { dev_err(&pdev->dev, "RTC BCD mode not supported "); return -EINVAL; } if (timectl & WM8350_RTC_12HR) { dev_err(&pdev->dev, "RTC 12 hour mode not supported "); return -EINVAL; } /* enable the RTC if it's not already enabled */ power5 = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5); if (!(power5 & WM8350_RTC_TICK_ENA)) { dev_info(wm8350->dev, "Starting RTC "); wm8350_reg_unlock(wm8350); ret = wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_RTC_TICK_ENA); if (ret < 0) { dev_err(&pdev->dev, "failed to enable RTC: %d ", ret); return ret; } wm8350_reg_lock(wm8350); } if (timectl & WM8350_RTC_STS) { int retries; ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET); if (ret < 0) { dev_err(&pdev->dev, "failed to start: %d ", ret); return ret; } retries = WM8350_SET_TIME_RETRIES; do { timectl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL); |
62da659a7 rtc-wm8350: retri... |
439 |
} while (timectl & WM8350_RTC_STS && --retries); |
077eaf5b4 rtc: rtc-wm8350: ... |
440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 |
if (retries == 0) { dev_err(&pdev->dev, "failed to start: timeout "); return -ENODEV; } } device_init_wakeup(&pdev->dev, 1); wm_rtc->rtc = rtc_device_register("wm8350", &pdev->dev, &wm8350_rtc_ops, THIS_MODULE); if (IS_ERR(wm_rtc->rtc)) { ret = PTR_ERR(wm_rtc->rtc); dev_err(&pdev->dev, "failed to register RTC: %d ", ret); return ret; } |
077eaf5b4 rtc: rtc-wm8350: ... |
458 |
wm8350_register_irq(wm8350, WM8350_IRQ_RTC_SEC, |
5a65edbc1 mfd: Convert wm83... |
459 460 |
wm8350_rtc_update_handler, 0, "RTC Seconds", wm8350); |
6a6127462 mfd: Mask and unm... |
461 |
wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_SEC); |
077eaf5b4 rtc: rtc-wm8350: ... |
462 463 |
wm8350_register_irq(wm8350, WM8350_IRQ_RTC_ALM, |
5a65edbc1 mfd: Convert wm83... |
464 465 |
wm8350_rtc_alarm_handler, 0, "RTC Alarm", wm8350); |
077eaf5b4 rtc: rtc-wm8350: ... |
466 467 468 469 470 471 472 473 |
return 0; } static int __devexit wm8350_rtc_remove(struct platform_device *pdev) { struct wm8350 *wm8350 = platform_get_drvdata(pdev); struct wm8350_rtc *wm_rtc = &wm8350->rtc; |
f99344fc6 mfd: Add a data a... |
474 475 |
wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_RTC_ALM, wm8350); |
077eaf5b4 rtc: rtc-wm8350: ... |
476 477 478 479 480 |
rtc_device_unregister(wm_rtc->rtc); return 0; } |
6f38b0436 rtc: convert WM83... |
481 482 483 484 |
static struct dev_pm_ops wm8350_rtc_pm_ops = { .suspend = wm8350_rtc_suspend, .resume = wm8350_rtc_resume, }; |
077eaf5b4 rtc: rtc-wm8350: ... |
485 486 487 |
static struct platform_driver wm8350_rtc_driver = { .probe = wm8350_rtc_probe, .remove = __devexit_p(wm8350_rtc_remove), |
077eaf5b4 rtc: rtc-wm8350: ... |
488 489 |
.driver = { .name = "wm8350-rtc", |
6f38b0436 rtc: convert WM83... |
490 |
.pm = &wm8350_rtc_pm_ops, |
077eaf5b4 rtc: rtc-wm8350: ... |
491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 |
}, }; static int __init wm8350_rtc_init(void) { return platform_driver_register(&wm8350_rtc_driver); } module_init(wm8350_rtc_init); static void __exit wm8350_rtc_exit(void) { platform_driver_unregister(&wm8350_rtc_driver); } module_exit(wm8350_rtc_exit); MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_DESCRIPTION("RTC driver for the WM8350"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm8350-rtc"); |