rtc-rc5t583.c 7.9 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312
  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * rtc-rc5t583.c -- RICOH RC5T583 Real Time Clock
  4. *
  5. * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
  6. * Author: Venu Byravarasu <vbyravarasu@nvidia.com>
  7. */
  8. #include <linux/kernel.h>
  9. #include <linux/errno.h>
  10. #include <linux/init.h>
  11. #include <linux/module.h>
  12. #include <linux/types.h>
  13. #include <linux/rtc.h>
  14. #include <linux/bcd.h>
  15. #include <linux/platform_device.h>
  16. #include <linux/interrupt.h>
  17. #include <linux/mfd/rc5t583.h>
  18. struct rc5t583_rtc {
  19. struct rtc_device *rtc;
  20. /* To store the list of enabled interrupts, during system suspend */
  21. u32 irqen;
  22. };
  23. /* Total number of RTC registers needed to set time*/
  24. #define NUM_TIME_REGS (RC5T583_RTC_YEAR - RC5T583_RTC_SEC + 1)
  25. /* Total number of RTC registers needed to set Y-Alarm*/
  26. #define NUM_YAL_REGS (RC5T583_RTC_AY_YEAR - RC5T583_RTC_AY_MIN + 1)
  27. /* Set Y-Alarm interrupt */
  28. #define SET_YAL BIT(5)
  29. /* Get Y-Alarm interrupt status*/
  30. #define GET_YAL_STATUS BIT(3)
  31. static int rc5t583_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
  32. {
  33. struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
  34. u8 val;
  35. /* Set Y-Alarm, based on 'enabled' */
  36. val = enabled ? SET_YAL : 0;
  37. return regmap_update_bits(rc5t583->regmap, RC5T583_RTC_CTL1, SET_YAL,
  38. val);
  39. }
  40. /*
  41. * Gets current rc5t583 RTC time and date parameters.
  42. *
  43. * The RTC's time/alarm representation is not what gmtime(3) requires
  44. * Linux to use:
  45. *
  46. * - Months are 1..12 vs Linux 0-11
  47. * - Years are 0..99 vs Linux 1900..N (we assume 21st century)
  48. */
  49. static int rc5t583_rtc_read_time(struct device *dev, struct rtc_time *tm)
  50. {
  51. struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
  52. u8 rtc_data[NUM_TIME_REGS];
  53. int ret;
  54. ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data,
  55. NUM_TIME_REGS);
  56. if (ret < 0) {
  57. dev_err(dev, "RTC read time failed with err:%d\n", ret);
  58. return ret;
  59. }
  60. tm->tm_sec = bcd2bin(rtc_data[0]);
  61. tm->tm_min = bcd2bin(rtc_data[1]);
  62. tm->tm_hour = bcd2bin(rtc_data[2]);
  63. tm->tm_wday = bcd2bin(rtc_data[3]);
  64. tm->tm_mday = bcd2bin(rtc_data[4]);
  65. tm->tm_mon = bcd2bin(rtc_data[5]) - 1;
  66. tm->tm_year = bcd2bin(rtc_data[6]) + 100;
  67. return ret;
  68. }
  69. static int rc5t583_rtc_set_time(struct device *dev, struct rtc_time *tm)
  70. {
  71. struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
  72. unsigned char rtc_data[NUM_TIME_REGS];
  73. int ret;
  74. rtc_data[0] = bin2bcd(tm->tm_sec);
  75. rtc_data[1] = bin2bcd(tm->tm_min);
  76. rtc_data[2] = bin2bcd(tm->tm_hour);
  77. rtc_data[3] = bin2bcd(tm->tm_wday);
  78. rtc_data[4] = bin2bcd(tm->tm_mday);
  79. rtc_data[5] = bin2bcd(tm->tm_mon + 1);
  80. rtc_data[6] = bin2bcd(tm->tm_year - 100);
  81. ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data,
  82. NUM_TIME_REGS);
  83. if (ret < 0) {
  84. dev_err(dev, "RTC set time failed with error %d\n", ret);
  85. return ret;
  86. }
  87. return ret;
  88. }
  89. static int rc5t583_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
  90. {
  91. struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
  92. unsigned char alarm_data[NUM_YAL_REGS];
  93. u32 interrupt_enable;
  94. int ret;
  95. ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data,
  96. NUM_YAL_REGS);
  97. if (ret < 0) {
  98. dev_err(dev, "rtc_read_alarm error %d\n", ret);
  99. return ret;
  100. }
  101. alm->time.tm_sec = 0;
  102. alm->time.tm_min = bcd2bin(alarm_data[0]);
  103. alm->time.tm_hour = bcd2bin(alarm_data[1]);
  104. alm->time.tm_mday = bcd2bin(alarm_data[2]);
  105. alm->time.tm_mon = bcd2bin(alarm_data[3]) - 1;
  106. alm->time.tm_year = bcd2bin(alarm_data[4]) + 100;
  107. ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, &interrupt_enable);
  108. if (ret < 0)
  109. return ret;
  110. /* check if YALE is set */
  111. if (interrupt_enable & SET_YAL)
  112. alm->enabled = 1;
  113. return ret;
  114. }
  115. static int rc5t583_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
  116. {
  117. struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
  118. unsigned char alarm_data[NUM_YAL_REGS];
  119. int ret;
  120. ret = rc5t583_rtc_alarm_irq_enable(dev, 0);
  121. if (ret)
  122. return ret;
  123. alarm_data[0] = bin2bcd(alm->time.tm_min);
  124. alarm_data[1] = bin2bcd(alm->time.tm_hour);
  125. alarm_data[2] = bin2bcd(alm->time.tm_mday);
  126. alarm_data[3] = bin2bcd(alm->time.tm_mon + 1);
  127. alarm_data[4] = bin2bcd(alm->time.tm_year - 100);
  128. ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data,
  129. NUM_YAL_REGS);
  130. if (ret) {
  131. dev_err(dev, "rtc_set_alarm error %d\n", ret);
  132. return ret;
  133. }
  134. if (alm->enabled)
  135. ret = rc5t583_rtc_alarm_irq_enable(dev, 1);
  136. return ret;
  137. }
  138. static irqreturn_t rc5t583_rtc_interrupt(int irq, void *rtc)
  139. {
  140. struct device *dev = rtc;
  141. struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
  142. struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
  143. unsigned long events = 0;
  144. int ret;
  145. u32 rtc_reg;
  146. ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL2, &rtc_reg);
  147. if (ret < 0)
  148. return IRQ_NONE;
  149. if (rtc_reg & GET_YAL_STATUS) {
  150. events = RTC_IRQF | RTC_AF;
  151. /* clear pending Y-alarm interrupt bit */
  152. rtc_reg &= ~GET_YAL_STATUS;
  153. }
  154. ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, rtc_reg);
  155. if (ret)
  156. return IRQ_NONE;
  157. /* Notify RTC core on event */
  158. rtc_update_irq(rc5t583_rtc->rtc, 1, events);
  159. return IRQ_HANDLED;
  160. }
  161. static const struct rtc_class_ops rc5t583_rtc_ops = {
  162. .read_time = rc5t583_rtc_read_time,
  163. .set_time = rc5t583_rtc_set_time,
  164. .read_alarm = rc5t583_rtc_read_alarm,
  165. .set_alarm = rc5t583_rtc_set_alarm,
  166. .alarm_irq_enable = rc5t583_rtc_alarm_irq_enable,
  167. };
  168. static int rc5t583_rtc_probe(struct platform_device *pdev)
  169. {
  170. struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
  171. struct rc5t583_rtc *ricoh_rtc;
  172. struct rc5t583_platform_data *pmic_plat_data;
  173. int ret;
  174. int irq;
  175. ricoh_rtc = devm_kzalloc(&pdev->dev, sizeof(struct rc5t583_rtc),
  176. GFP_KERNEL);
  177. if (!ricoh_rtc)
  178. return -ENOMEM;
  179. platform_set_drvdata(pdev, ricoh_rtc);
  180. /* Clear pending interrupts */
  181. ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, 0);
  182. if (ret < 0)
  183. return ret;
  184. /* clear RTC Adjust register */
  185. ret = regmap_write(rc5t583->regmap, RC5T583_RTC_ADJ, 0);
  186. if (ret < 0) {
  187. dev_err(&pdev->dev, "unable to program rtc_adjust reg\n");
  188. return -EBUSY;
  189. }
  190. pmic_plat_data = dev_get_platdata(rc5t583->dev);
  191. irq = pmic_plat_data->irq_base;
  192. if (irq <= 0) {
  193. dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
  194. irq);
  195. return ret;
  196. }
  197. irq += RC5T583_IRQ_YALE;
  198. ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
  199. rc5t583_rtc_interrupt, IRQF_TRIGGER_LOW,
  200. "rtc-rc5t583", &pdev->dev);
  201. if (ret < 0) {
  202. dev_err(&pdev->dev, "IRQ is not free.\n");
  203. return ret;
  204. }
  205. device_init_wakeup(&pdev->dev, 1);
  206. ricoh_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
  207. &rc5t583_rtc_ops, THIS_MODULE);
  208. if (IS_ERR(ricoh_rtc->rtc)) {
  209. ret = PTR_ERR(ricoh_rtc->rtc);
  210. dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
  211. return ret;
  212. }
  213. return 0;
  214. }
  215. /*
  216. * Disable rc5t583 RTC interrupts.
  217. * Sets status flag to free.
  218. */
  219. static int rc5t583_rtc_remove(struct platform_device *pdev)
  220. {
  221. struct rc5t583_rtc *rc5t583_rtc = platform_get_drvdata(pdev);
  222. rc5t583_rtc_alarm_irq_enable(&rc5t583_rtc->rtc->dev, 0);
  223. return 0;
  224. }
  225. #ifdef CONFIG_PM_SLEEP
  226. static int rc5t583_rtc_suspend(struct device *dev)
  227. {
  228. struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
  229. struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
  230. int ret;
  231. /* Store current list of enabled interrupts*/
  232. ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1,
  233. &rc5t583_rtc->irqen);
  234. return ret;
  235. }
  236. static int rc5t583_rtc_resume(struct device *dev)
  237. {
  238. struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
  239. struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
  240. /* Restore list of enabled interrupts before suspend */
  241. return regmap_write(rc5t583->regmap, RC5T583_RTC_CTL1,
  242. rc5t583_rtc->irqen);
  243. }
  244. #endif
  245. static SIMPLE_DEV_PM_OPS(rc5t583_rtc_pm_ops, rc5t583_rtc_suspend,
  246. rc5t583_rtc_resume);
  247. static struct platform_driver rc5t583_rtc_driver = {
  248. .probe = rc5t583_rtc_probe,
  249. .remove = rc5t583_rtc_remove,
  250. .driver = {
  251. .name = "rtc-rc5t583",
  252. .pm = &rc5t583_rtc_pm_ops,
  253. },
  254. };
  255. module_platform_driver(rc5t583_rtc_driver);
  256. MODULE_ALIAS("platform:rtc-rc5t583");
  257. MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
  258. MODULE_LICENSE("GPL v2");