extcon-palmas.c 13 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439
  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Palmas USB transceiver driver
  4. *
  5. * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
  6. * Author: Graeme Gregory <gg@slimlogic.co.uk>
  7. * Author: Kishon Vijay Abraham I <kishon@ti.com>
  8. * Based on twl6030_usb.c
  9. * Author: Hema HK <hemahk@ti.com>
  10. */
  11. #include <linux/module.h>
  12. #include <linux/interrupt.h>
  13. #include <linux/platform_device.h>
  14. #include <linux/slab.h>
  15. #include <linux/err.h>
  16. #include <linux/mfd/palmas.h>
  17. #include <linux/of.h>
  18. #include <linux/of_platform.h>
  19. #include <linux/of_gpio.h>
  20. #include <linux/gpio/consumer.h>
  21. #include <linux/workqueue.h>
  22. #define USB_GPIO_DEBOUNCE_MS 20 /* ms */
  23. static const unsigned int palmas_extcon_cable[] = {
  24. EXTCON_USB,
  25. EXTCON_USB_HOST,
  26. EXTCON_NONE,
  27. };
  28. static void palmas_usb_wakeup(struct palmas *palmas, int enable)
  29. {
  30. if (enable)
  31. palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
  32. PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
  33. else
  34. palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
  35. }
  36. static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
  37. {
  38. struct palmas_usb *palmas_usb = _palmas_usb;
  39. struct extcon_dev *edev = palmas_usb->edev;
  40. unsigned int vbus_line_state;
  41. palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
  42. PALMAS_INT3_LINE_STATE, &vbus_line_state);
  43. if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
  44. if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
  45. palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
  46. extcon_set_state_sync(edev, EXTCON_USB, true);
  47. dev_dbg(palmas_usb->dev, "USB cable is attached\n");
  48. } else {
  49. dev_dbg(palmas_usb->dev,
  50. "Spurious connect event detected\n");
  51. }
  52. } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
  53. if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
  54. palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
  55. extcon_set_state_sync(edev, EXTCON_USB, false);
  56. dev_dbg(palmas_usb->dev, "USB cable is detached\n");
  57. } else {
  58. dev_dbg(palmas_usb->dev,
  59. "Spurious disconnect event detected\n");
  60. }
  61. }
  62. return IRQ_HANDLED;
  63. }
  64. static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
  65. {
  66. unsigned int set, id_src;
  67. struct palmas_usb *palmas_usb = _palmas_usb;
  68. struct extcon_dev *edev = palmas_usb->edev;
  69. palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  70. PALMAS_USB_ID_INT_LATCH_SET, &set);
  71. palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  72. PALMAS_USB_ID_INT_SRC, &id_src);
  73. if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
  74. (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
  75. palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  76. PALMAS_USB_ID_INT_LATCH_CLR,
  77. PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
  78. palmas_usb->linkstat = PALMAS_USB_STATE_ID;
  79. extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
  80. dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
  81. } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
  82. (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
  83. palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  84. PALMAS_USB_ID_INT_LATCH_CLR,
  85. PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
  86. palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
  87. extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
  88. dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
  89. } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
  90. (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
  91. palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
  92. extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
  93. dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
  94. } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
  95. (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
  96. palmas_usb->linkstat = PALMAS_USB_STATE_ID;
  97. extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
  98. dev_dbg(palmas_usb->dev, " USB-HOST cable is attached\n");
  99. }
  100. return IRQ_HANDLED;
  101. }
  102. static void palmas_gpio_id_detect(struct work_struct *work)
  103. {
  104. int id;
  105. struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
  106. struct palmas_usb,
  107. wq_detectid);
  108. struct extcon_dev *edev = palmas_usb->edev;
  109. if (!palmas_usb->id_gpiod)
  110. return;
  111. id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
  112. if (id) {
  113. extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
  114. dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
  115. } else {
  116. extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
  117. dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
  118. }
  119. }
  120. static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
  121. {
  122. struct palmas_usb *palmas_usb = _palmas_usb;
  123. queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
  124. palmas_usb->sw_debounce_jiffies);
  125. return IRQ_HANDLED;
  126. }
  127. static void palmas_enable_irq(struct palmas_usb *palmas_usb)
  128. {
  129. palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  130. PALMAS_USB_VBUS_CTRL_SET,
  131. PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
  132. if (palmas_usb->enable_id_detection) {
  133. palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  134. PALMAS_USB_ID_CTRL_SET,
  135. PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
  136. palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
  137. PALMAS_USB_ID_INT_EN_HI_SET,
  138. PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
  139. PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
  140. }
  141. if (palmas_usb->enable_vbus_detection)
  142. palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
  143. /* cold plug for host mode needs this delay */
  144. if (palmas_usb->enable_id_detection) {
  145. msleep(30);
  146. palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
  147. }
  148. }
  149. static int palmas_usb_probe(struct platform_device *pdev)
  150. {
  151. struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
  152. struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
  153. struct device_node *node = pdev->dev.of_node;
  154. struct palmas_usb *palmas_usb;
  155. int status;
  156. if (!palmas) {
  157. dev_err(&pdev->dev, "failed to get valid parent\n");
  158. return -EINVAL;
  159. }
  160. palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
  161. if (!palmas_usb)
  162. return -ENOMEM;
  163. if (node && !pdata) {
  164. palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
  165. palmas_usb->enable_id_detection = of_property_read_bool(node,
  166. "ti,enable-id-detection");
  167. palmas_usb->enable_vbus_detection = of_property_read_bool(node,
  168. "ti,enable-vbus-detection");
  169. } else {
  170. palmas_usb->wakeup = true;
  171. palmas_usb->enable_id_detection = true;
  172. palmas_usb->enable_vbus_detection = true;
  173. if (pdata)
  174. palmas_usb->wakeup = pdata->wakeup;
  175. }
  176. palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
  177. GPIOD_IN);
  178. if (IS_ERR(palmas_usb->id_gpiod))
  179. return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->id_gpiod),
  180. "failed to get id gpio\n");
  181. palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
  182. GPIOD_IN);
  183. if (IS_ERR(palmas_usb->vbus_gpiod))
  184. return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->vbus_gpiod),
  185. "failed to get id gpio\n");
  186. if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
  187. palmas_usb->enable_id_detection = false;
  188. palmas_usb->enable_gpio_id_detection = true;
  189. }
  190. if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
  191. palmas_usb->enable_vbus_detection = false;
  192. palmas_usb->enable_gpio_vbus_detection = true;
  193. }
  194. if (palmas_usb->enable_gpio_id_detection) {
  195. u32 debounce;
  196. if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
  197. debounce = USB_GPIO_DEBOUNCE_MS;
  198. status = gpiod_set_debounce(palmas_usb->id_gpiod,
  199. debounce * 1000);
  200. if (status < 0)
  201. palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
  202. }
  203. INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
  204. palmas->usb = palmas_usb;
  205. palmas_usb->palmas = palmas;
  206. palmas_usb->dev = &pdev->dev;
  207. palmas_usb_wakeup(palmas, palmas_usb->wakeup);
  208. platform_set_drvdata(pdev, palmas_usb);
  209. palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
  210. palmas_extcon_cable);
  211. if (IS_ERR(palmas_usb->edev)) {
  212. dev_err(&pdev->dev, "failed to allocate extcon device\n");
  213. return -ENOMEM;
  214. }
  215. status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
  216. if (status) {
  217. dev_err(&pdev->dev, "failed to register extcon device\n");
  218. return status;
  219. }
  220. if (palmas_usb->enable_id_detection) {
  221. palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
  222. PALMAS_ID_OTG_IRQ);
  223. palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
  224. PALMAS_ID_IRQ);
  225. status = devm_request_threaded_irq(palmas_usb->dev,
  226. palmas_usb->id_irq,
  227. NULL, palmas_id_irq_handler,
  228. IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
  229. IRQF_ONESHOT,
  230. "palmas_usb_id", palmas_usb);
  231. if (status < 0) {
  232. dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
  233. palmas_usb->id_irq, status);
  234. return status;
  235. }
  236. } else if (palmas_usb->enable_gpio_id_detection) {
  237. palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
  238. if (palmas_usb->gpio_id_irq < 0) {
  239. dev_err(&pdev->dev, "failed to get id irq\n");
  240. return palmas_usb->gpio_id_irq;
  241. }
  242. status = devm_request_threaded_irq(&pdev->dev,
  243. palmas_usb->gpio_id_irq,
  244. NULL,
  245. palmas_gpio_id_irq_handler,
  246. IRQF_TRIGGER_RISING |
  247. IRQF_TRIGGER_FALLING |
  248. IRQF_ONESHOT,
  249. "palmas_usb_id",
  250. palmas_usb);
  251. if (status < 0) {
  252. dev_err(&pdev->dev,
  253. "failed to request handler for id irq\n");
  254. return status;
  255. }
  256. }
  257. if (palmas_usb->enable_vbus_detection) {
  258. palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
  259. PALMAS_VBUS_OTG_IRQ);
  260. palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
  261. PALMAS_VBUS_IRQ);
  262. status = devm_request_threaded_irq(palmas_usb->dev,
  263. palmas_usb->vbus_irq, NULL,
  264. palmas_vbus_irq_handler,
  265. IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
  266. IRQF_ONESHOT,
  267. "palmas_usb_vbus", palmas_usb);
  268. if (status < 0) {
  269. dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
  270. palmas_usb->vbus_irq, status);
  271. return status;
  272. }
  273. } else if (palmas_usb->enable_gpio_vbus_detection) {
  274. /* remux GPIO_1 as VBUSDET */
  275. status = palmas_update_bits(palmas,
  276. PALMAS_PU_PD_OD_BASE,
  277. PALMAS_PRIMARY_SECONDARY_PAD1,
  278. PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
  279. (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
  280. if (status < 0) {
  281. dev_err(&pdev->dev, "can't remux GPIO1\n");
  282. return status;
  283. }
  284. palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
  285. PALMAS_VBUS_OTG_IRQ);
  286. palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
  287. if (palmas_usb->gpio_vbus_irq < 0) {
  288. dev_err(&pdev->dev, "failed to get vbus irq\n");
  289. return palmas_usb->gpio_vbus_irq;
  290. }
  291. status = devm_request_threaded_irq(&pdev->dev,
  292. palmas_usb->gpio_vbus_irq,
  293. NULL,
  294. palmas_vbus_irq_handler,
  295. IRQF_TRIGGER_FALLING |
  296. IRQF_TRIGGER_RISING |
  297. IRQF_ONESHOT,
  298. "palmas_usb_vbus",
  299. palmas_usb);
  300. if (status < 0) {
  301. dev_err(&pdev->dev,
  302. "failed to request handler for vbus irq\n");
  303. return status;
  304. }
  305. }
  306. palmas_enable_irq(palmas_usb);
  307. /* perform initial detection */
  308. if (palmas_usb->enable_gpio_vbus_detection)
  309. palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
  310. palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
  311. device_set_wakeup_capable(&pdev->dev, true);
  312. return 0;
  313. }
  314. static int palmas_usb_remove(struct platform_device *pdev)
  315. {
  316. struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
  317. cancel_delayed_work_sync(&palmas_usb->wq_detectid);
  318. return 0;
  319. }
  320. #ifdef CONFIG_PM_SLEEP
  321. static int palmas_usb_suspend(struct device *dev)
  322. {
  323. struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
  324. if (device_may_wakeup(dev)) {
  325. if (palmas_usb->enable_vbus_detection)
  326. enable_irq_wake(palmas_usb->vbus_irq);
  327. if (palmas_usb->enable_gpio_vbus_detection)
  328. enable_irq_wake(palmas_usb->gpio_vbus_irq);
  329. if (palmas_usb->enable_id_detection)
  330. enable_irq_wake(palmas_usb->id_irq);
  331. if (palmas_usb->enable_gpio_id_detection)
  332. enable_irq_wake(palmas_usb->gpio_id_irq);
  333. }
  334. return 0;
  335. }
  336. static int palmas_usb_resume(struct device *dev)
  337. {
  338. struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
  339. if (device_may_wakeup(dev)) {
  340. if (palmas_usb->enable_vbus_detection)
  341. disable_irq_wake(palmas_usb->vbus_irq);
  342. if (palmas_usb->enable_gpio_vbus_detection)
  343. disable_irq_wake(palmas_usb->gpio_vbus_irq);
  344. if (palmas_usb->enable_id_detection)
  345. disable_irq_wake(palmas_usb->id_irq);
  346. if (palmas_usb->enable_gpio_id_detection)
  347. disable_irq_wake(palmas_usb->gpio_id_irq);
  348. }
  349. /* check if GPIO states changed while suspend/resume */
  350. if (palmas_usb->enable_gpio_vbus_detection)
  351. palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
  352. palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
  353. return 0;
  354. };
  355. #endif
  356. static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
  357. static const struct of_device_id of_palmas_match_tbl[] = {
  358. { .compatible = "ti,palmas-usb", },
  359. { .compatible = "ti,palmas-usb-vid", },
  360. { .compatible = "ti,twl6035-usb", },
  361. { .compatible = "ti,twl6035-usb-vid", },
  362. { /* end */ }
  363. };
  364. static struct platform_driver palmas_usb_driver = {
  365. .probe = palmas_usb_probe,
  366. .remove = palmas_usb_remove,
  367. .driver = {
  368. .name = "palmas-usb",
  369. .of_match_table = of_palmas_match_tbl,
  370. .pm = &palmas_pm_ops,
  371. },
  372. };
  373. module_platform_driver(palmas_usb_driver);
  374. MODULE_ALIAS("platform:palmas-usb");
  375. MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
  376. MODULE_DESCRIPTION("Palmas USB transceiver driver");
  377. MODULE_LICENSE("GPL");
  378. MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);