1 /* 2 * Palmas USB transceiver driver 3 * 4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * Author: Graeme Gregory <gg@slimlogic.co.uk> 11 * Author: Kishon Vijay Abraham I <kishon@ti.com> 12 * 13 * Based on twl6030_usb.c 14 * 15 * Author: Hema HK <hemahk@ti.com> 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 */ 22 23 #include <linux/module.h> 24 #include <linux/interrupt.h> 25 #include <linux/platform_device.h> 26 #include <linux/slab.h> 27 #include <linux/err.h> 28 #include <linux/mfd/palmas.h> 29 #include <linux/of.h> 30 #include <linux/of_platform.h> 31 #include <linux/of_gpio.h> 32 #include <linux/gpio/consumer.h> 33 #include <linux/workqueue.h> 34 35 #define USB_GPIO_DEBOUNCE_MS 20 /* ms */ 36 37 static const unsigned int palmas_extcon_cable[] = { 38 EXTCON_USB, 39 EXTCON_USB_HOST, 40 EXTCON_NONE, 41 }; 42 43 static void palmas_usb_wakeup(struct palmas *palmas, int enable) 44 { 45 if (enable) 46 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 47 PALMAS_USB_WAKEUP_ID_WK_UP_COMP); 48 else 49 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0); 50 } 51 52 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb) 53 { 54 struct palmas_usb *palmas_usb = _palmas_usb; 55 struct extcon_dev *edev = palmas_usb->edev; 56 unsigned int vbus_line_state; 57 58 palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE, 59 PALMAS_INT3_LINE_STATE, &vbus_line_state); 60 61 if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) { 62 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) { 63 palmas_usb->linkstat = PALMAS_USB_STATE_VBUS; 64 extcon_set_state_sync(edev, EXTCON_USB, true); 65 dev_dbg(palmas_usb->dev, "USB cable is attached\n"); 66 } else { 67 dev_dbg(palmas_usb->dev, 68 "Spurious connect event detected\n"); 69 } 70 } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) { 71 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) { 72 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; 73 extcon_set_state_sync(edev, EXTCON_USB, false); 74 dev_dbg(palmas_usb->dev, "USB cable is detached\n"); 75 } else { 76 dev_dbg(palmas_usb->dev, 77 "Spurious disconnect event detected\n"); 78 } 79 } 80 81 return IRQ_HANDLED; 82 } 83 84 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb) 85 { 86 unsigned int set, id_src; 87 struct palmas_usb *palmas_usb = _palmas_usb; 88 struct extcon_dev *edev = palmas_usb->edev; 89 90 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 91 PALMAS_USB_ID_INT_LATCH_SET, &set); 92 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 93 PALMAS_USB_ID_INT_SRC, &id_src); 94 95 if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) && 96 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) { 97 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 98 PALMAS_USB_ID_INT_LATCH_CLR, 99 PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND); 100 palmas_usb->linkstat = PALMAS_USB_STATE_ID; 101 extcon_set_state_sync(edev, EXTCON_USB_HOST, true); 102 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n"); 103 } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) && 104 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) { 105 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 106 PALMAS_USB_ID_INT_LATCH_CLR, 107 PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT); 108 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; 109 extcon_set_state_sync(edev, EXTCON_USB_HOST, false); 110 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n"); 111 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) && 112 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) { 113 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; 114 extcon_set_state_sync(edev, EXTCON_USB_HOST, false); 115 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n"); 116 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) && 117 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) { 118 palmas_usb->linkstat = PALMAS_USB_STATE_ID; 119 extcon_set_state_sync(edev, EXTCON_USB_HOST, true); 120 dev_dbg(palmas_usb->dev, " USB-HOST cable is attached\n"); 121 } 122 123 return IRQ_HANDLED; 124 } 125 126 static void palmas_gpio_id_detect(struct work_struct *work) 127 { 128 int id; 129 struct palmas_usb *palmas_usb = container_of(to_delayed_work(work), 130 struct palmas_usb, 131 wq_detectid); 132 struct extcon_dev *edev = palmas_usb->edev; 133 134 if (!palmas_usb->id_gpiod) 135 return; 136 137 id = gpiod_get_value_cansleep(palmas_usb->id_gpiod); 138 139 if (id) { 140 extcon_set_state_sync(edev, EXTCON_USB_HOST, false); 141 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n"); 142 } else { 143 extcon_set_state_sync(edev, EXTCON_USB_HOST, true); 144 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n"); 145 } 146 } 147 148 static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb) 149 { 150 struct palmas_usb *palmas_usb = _palmas_usb; 151 152 queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid, 153 palmas_usb->sw_debounce_jiffies); 154 155 return IRQ_HANDLED; 156 } 157 158 static void palmas_enable_irq(struct palmas_usb *palmas_usb) 159 { 160 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 161 PALMAS_USB_VBUS_CTRL_SET, 162 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP); 163 164 if (palmas_usb->enable_id_detection) { 165 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 166 PALMAS_USB_ID_CTRL_SET, 167 PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP); 168 169 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 170 PALMAS_USB_ID_INT_EN_HI_SET, 171 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND | 172 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT); 173 } 174 175 if (palmas_usb->enable_vbus_detection) 176 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); 177 178 /* cold plug for host mode needs this delay */ 179 if (palmas_usb->enable_id_detection) { 180 msleep(30); 181 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb); 182 } 183 } 184 185 static int palmas_usb_probe(struct platform_device *pdev) 186 { 187 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); 188 struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); 189 struct device_node *node = pdev->dev.of_node; 190 struct palmas_usb *palmas_usb; 191 int status; 192 193 if (!palmas) { 194 dev_err(&pdev->dev, "failed to get valid parent\n"); 195 return -EINVAL; 196 } 197 198 palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); 199 if (!palmas_usb) 200 return -ENOMEM; 201 202 if (node && !pdata) { 203 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup"); 204 palmas_usb->enable_id_detection = of_property_read_bool(node, 205 "ti,enable-id-detection"); 206 palmas_usb->enable_vbus_detection = of_property_read_bool(node, 207 "ti,enable-vbus-detection"); 208 } else { 209 palmas_usb->wakeup = true; 210 palmas_usb->enable_id_detection = true; 211 palmas_usb->enable_vbus_detection = true; 212 213 if (pdata) 214 palmas_usb->wakeup = pdata->wakeup; 215 } 216 217 palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", 218 GPIOD_IN); 219 if (IS_ERR(palmas_usb->id_gpiod)) { 220 dev_err(&pdev->dev, "failed to get id gpio\n"); 221 return PTR_ERR(palmas_usb->id_gpiod); 222 } 223 224 palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus", 225 GPIOD_IN); 226 if (IS_ERR(palmas_usb->vbus_gpiod)) { 227 dev_err(&pdev->dev, "failed to get vbus gpio\n"); 228 return PTR_ERR(palmas_usb->vbus_gpiod); 229 } 230 231 if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) { 232 palmas_usb->enable_id_detection = false; 233 palmas_usb->enable_gpio_id_detection = true; 234 } 235 236 if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) { 237 palmas_usb->enable_vbus_detection = false; 238 palmas_usb->enable_gpio_vbus_detection = true; 239 } 240 241 if (palmas_usb->enable_gpio_id_detection) { 242 u32 debounce; 243 244 if (of_property_read_u32(node, "debounce-delay-ms", &debounce)) 245 debounce = USB_GPIO_DEBOUNCE_MS; 246 247 status = gpiod_set_debounce(palmas_usb->id_gpiod, 248 debounce * 1000); 249 if (status < 0) 250 palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce); 251 } 252 253 INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect); 254 255 palmas->usb = palmas_usb; 256 palmas_usb->palmas = palmas; 257 258 palmas_usb->dev = &pdev->dev; 259 260 palmas_usb_wakeup(palmas, palmas_usb->wakeup); 261 262 platform_set_drvdata(pdev, palmas_usb); 263 264 palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev, 265 palmas_extcon_cable); 266 if (IS_ERR(palmas_usb->edev)) { 267 dev_err(&pdev->dev, "failed to allocate extcon device\n"); 268 return -ENOMEM; 269 } 270 271 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev); 272 if (status) { 273 dev_err(&pdev->dev, "failed to register extcon device\n"); 274 return status; 275 } 276 277 if (palmas_usb->enable_id_detection) { 278 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, 279 PALMAS_ID_OTG_IRQ); 280 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, 281 PALMAS_ID_IRQ); 282 status = devm_request_threaded_irq(palmas_usb->dev, 283 palmas_usb->id_irq, 284 NULL, palmas_id_irq_handler, 285 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 286 IRQF_ONESHOT, 287 "palmas_usb_id", palmas_usb); 288 if (status < 0) { 289 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 290 palmas_usb->id_irq, status); 291 return status; 292 } 293 } else if (palmas_usb->enable_gpio_id_detection) { 294 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod); 295 if (palmas_usb->gpio_id_irq < 0) { 296 dev_err(&pdev->dev, "failed to get id irq\n"); 297 return palmas_usb->gpio_id_irq; 298 } 299 status = devm_request_threaded_irq(&pdev->dev, 300 palmas_usb->gpio_id_irq, 301 NULL, 302 palmas_gpio_id_irq_handler, 303 IRQF_TRIGGER_RISING | 304 IRQF_TRIGGER_FALLING | 305 IRQF_ONESHOT, 306 "palmas_usb_id", 307 palmas_usb); 308 if (status < 0) { 309 dev_err(&pdev->dev, 310 "failed to request handler for id irq\n"); 311 return status; 312 } 313 } 314 315 if (palmas_usb->enable_vbus_detection) { 316 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, 317 PALMAS_VBUS_OTG_IRQ); 318 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, 319 PALMAS_VBUS_IRQ); 320 status = devm_request_threaded_irq(palmas_usb->dev, 321 palmas_usb->vbus_irq, NULL, 322 palmas_vbus_irq_handler, 323 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 324 IRQF_ONESHOT, 325 "palmas_usb_vbus", palmas_usb); 326 if (status < 0) { 327 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 328 palmas_usb->vbus_irq, status); 329 return status; 330 } 331 } else if (palmas_usb->enable_gpio_vbus_detection) { 332 /* remux GPIO_1 as VBUSDET */ 333 status = palmas_update_bits(palmas, 334 PALMAS_PU_PD_OD_BASE, 335 PALMAS_PRIMARY_SECONDARY_PAD1, 336 PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK, 337 (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT)); 338 if (status < 0) { 339 dev_err(&pdev->dev, "can't remux GPIO1\n"); 340 return status; 341 } 342 343 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, 344 PALMAS_VBUS_OTG_IRQ); 345 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod); 346 if (palmas_usb->gpio_vbus_irq < 0) { 347 dev_err(&pdev->dev, "failed to get vbus irq\n"); 348 return palmas_usb->gpio_vbus_irq; 349 } 350 status = devm_request_threaded_irq(&pdev->dev, 351 palmas_usb->gpio_vbus_irq, 352 NULL, 353 palmas_vbus_irq_handler, 354 IRQF_TRIGGER_FALLING | 355 IRQF_TRIGGER_RISING | 356 IRQF_ONESHOT, 357 "palmas_usb_vbus", 358 palmas_usb); 359 if (status < 0) { 360 dev_err(&pdev->dev, 361 "failed to request handler for vbus irq\n"); 362 return status; 363 } 364 } 365 366 palmas_enable_irq(palmas_usb); 367 /* perform initial detection */ 368 if (palmas_usb->enable_gpio_vbus_detection) 369 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb); 370 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work); 371 device_set_wakeup_capable(&pdev->dev, true); 372 return 0; 373 } 374 375 static int palmas_usb_remove(struct platform_device *pdev) 376 { 377 struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); 378 379 cancel_delayed_work_sync(&palmas_usb->wq_detectid); 380 381 return 0; 382 } 383 384 #ifdef CONFIG_PM_SLEEP 385 static int palmas_usb_suspend(struct device *dev) 386 { 387 struct palmas_usb *palmas_usb = dev_get_drvdata(dev); 388 389 if (device_may_wakeup(dev)) { 390 if (palmas_usb->enable_vbus_detection) 391 enable_irq_wake(palmas_usb->vbus_irq); 392 if (palmas_usb->enable_gpio_vbus_detection) 393 enable_irq_wake(palmas_usb->gpio_vbus_irq); 394 if (palmas_usb->enable_id_detection) 395 enable_irq_wake(palmas_usb->id_irq); 396 if (palmas_usb->enable_gpio_id_detection) 397 enable_irq_wake(palmas_usb->gpio_id_irq); 398 } 399 return 0; 400 } 401 402 static int palmas_usb_resume(struct device *dev) 403 { 404 struct palmas_usb *palmas_usb = dev_get_drvdata(dev); 405 406 if (device_may_wakeup(dev)) { 407 if (palmas_usb->enable_vbus_detection) 408 disable_irq_wake(palmas_usb->vbus_irq); 409 if (palmas_usb->enable_gpio_vbus_detection) 410 disable_irq_wake(palmas_usb->gpio_vbus_irq); 411 if (palmas_usb->enable_id_detection) 412 disable_irq_wake(palmas_usb->id_irq); 413 if (palmas_usb->enable_gpio_id_detection) 414 disable_irq_wake(palmas_usb->gpio_id_irq); 415 } 416 417 /* check if GPIO states changed while suspend/resume */ 418 if (palmas_usb->enable_gpio_vbus_detection) 419 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb); 420 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work); 421 422 return 0; 423 }; 424 #endif 425 426 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume); 427 428 static const struct of_device_id of_palmas_match_tbl[] = { 429 { .compatible = "ti,palmas-usb", }, 430 { .compatible = "ti,palmas-usb-vid", }, 431 { .compatible = "ti,twl6035-usb", }, 432 { .compatible = "ti,twl6035-usb-vid", }, 433 { /* end */ } 434 }; 435 436 static struct platform_driver palmas_usb_driver = { 437 .probe = palmas_usb_probe, 438 .remove = palmas_usb_remove, 439 .driver = { 440 .name = "palmas-usb", 441 .of_match_table = of_palmas_match_tbl, 442 .pm = &palmas_pm_ops, 443 }, 444 }; 445 446 module_platform_driver(palmas_usb_driver); 447 448 MODULE_ALIAS("platform:palmas-usb"); 449 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); 450 MODULE_DESCRIPTION("Palmas USB transceiver driver"); 451 MODULE_LICENSE("GPL"); 452 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); 453