1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Palmas USB transceiver driver 4 * 5 * Copyright (C) 2013 Texas Instruments Incorporated - http://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 12 #include <linux/module.h> 13 #include <linux/interrupt.h> 14 #include <linux/platform_device.h> 15 #include <linux/slab.h> 16 #include <linux/err.h> 17 #include <linux/mfd/palmas.h> 18 #include <linux/of.h> 19 #include <linux/of_platform.h> 20 #include <linux/of_gpio.h> 21 #include <linux/gpio/consumer.h> 22 #include <linux/workqueue.h> 23 24 #define USB_GPIO_DEBOUNCE_MS 20 /* ms */ 25 26 static const unsigned int palmas_extcon_cable[] = { 27 EXTCON_USB, 28 EXTCON_USB_HOST, 29 EXTCON_NONE, 30 }; 31 32 static void palmas_usb_wakeup(struct palmas *palmas, int enable) 33 { 34 if (enable) 35 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 36 PALMAS_USB_WAKEUP_ID_WK_UP_COMP); 37 else 38 palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0); 39 } 40 41 static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb) 42 { 43 struct palmas_usb *palmas_usb = _palmas_usb; 44 struct extcon_dev *edev = palmas_usb->edev; 45 unsigned int vbus_line_state; 46 47 palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE, 48 PALMAS_INT3_LINE_STATE, &vbus_line_state); 49 50 if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) { 51 if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) { 52 palmas_usb->linkstat = PALMAS_USB_STATE_VBUS; 53 extcon_set_state_sync(edev, EXTCON_USB, true); 54 dev_dbg(palmas_usb->dev, "USB cable is attached\n"); 55 } else { 56 dev_dbg(palmas_usb->dev, 57 "Spurious connect event detected\n"); 58 } 59 } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) { 60 if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) { 61 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; 62 extcon_set_state_sync(edev, EXTCON_USB, false); 63 dev_dbg(palmas_usb->dev, "USB cable is detached\n"); 64 } else { 65 dev_dbg(palmas_usb->dev, 66 "Spurious disconnect event detected\n"); 67 } 68 } 69 70 return IRQ_HANDLED; 71 } 72 73 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb) 74 { 75 unsigned int set, id_src; 76 struct palmas_usb *palmas_usb = _palmas_usb; 77 struct extcon_dev *edev = palmas_usb->edev; 78 79 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 80 PALMAS_USB_ID_INT_LATCH_SET, &set); 81 palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 82 PALMAS_USB_ID_INT_SRC, &id_src); 83 84 if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) && 85 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) { 86 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 87 PALMAS_USB_ID_INT_LATCH_CLR, 88 PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND); 89 palmas_usb->linkstat = PALMAS_USB_STATE_ID; 90 extcon_set_state_sync(edev, EXTCON_USB_HOST, true); 91 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n"); 92 } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) && 93 (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) { 94 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 95 PALMAS_USB_ID_INT_LATCH_CLR, 96 PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT); 97 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; 98 extcon_set_state_sync(edev, EXTCON_USB_HOST, false); 99 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n"); 100 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) && 101 (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) { 102 palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; 103 extcon_set_state_sync(edev, EXTCON_USB_HOST, false); 104 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n"); 105 } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) && 106 (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) { 107 palmas_usb->linkstat = PALMAS_USB_STATE_ID; 108 extcon_set_state_sync(edev, EXTCON_USB_HOST, true); 109 dev_dbg(palmas_usb->dev, " USB-HOST cable is attached\n"); 110 } 111 112 return IRQ_HANDLED; 113 } 114 115 static void palmas_gpio_id_detect(struct work_struct *work) 116 { 117 int id; 118 struct palmas_usb *palmas_usb = container_of(to_delayed_work(work), 119 struct palmas_usb, 120 wq_detectid); 121 struct extcon_dev *edev = palmas_usb->edev; 122 123 if (!palmas_usb->id_gpiod) 124 return; 125 126 id = gpiod_get_value_cansleep(palmas_usb->id_gpiod); 127 128 if (id) { 129 extcon_set_state_sync(edev, EXTCON_USB_HOST, false); 130 dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n"); 131 } else { 132 extcon_set_state_sync(edev, EXTCON_USB_HOST, true); 133 dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n"); 134 } 135 } 136 137 static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb) 138 { 139 struct palmas_usb *palmas_usb = _palmas_usb; 140 141 queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid, 142 palmas_usb->sw_debounce_jiffies); 143 144 return IRQ_HANDLED; 145 } 146 147 static void palmas_enable_irq(struct palmas_usb *palmas_usb) 148 { 149 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 150 PALMAS_USB_VBUS_CTRL_SET, 151 PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP); 152 153 if (palmas_usb->enable_id_detection) { 154 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 155 PALMAS_USB_ID_CTRL_SET, 156 PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP); 157 158 palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, 159 PALMAS_USB_ID_INT_EN_HI_SET, 160 PALMAS_USB_ID_INT_EN_HI_SET_ID_GND | 161 PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT); 162 } 163 164 if (palmas_usb->enable_vbus_detection) 165 palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); 166 167 /* cold plug for host mode needs this delay */ 168 if (palmas_usb->enable_id_detection) { 169 msleep(30); 170 palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb); 171 } 172 } 173 174 static int palmas_usb_probe(struct platform_device *pdev) 175 { 176 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); 177 struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); 178 struct device_node *node = pdev->dev.of_node; 179 struct palmas_usb *palmas_usb; 180 int status; 181 182 if (!palmas) { 183 dev_err(&pdev->dev, "failed to get valid parent\n"); 184 return -EINVAL; 185 } 186 187 palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); 188 if (!palmas_usb) 189 return -ENOMEM; 190 191 if (node && !pdata) { 192 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup"); 193 palmas_usb->enable_id_detection = of_property_read_bool(node, 194 "ti,enable-id-detection"); 195 palmas_usb->enable_vbus_detection = of_property_read_bool(node, 196 "ti,enable-vbus-detection"); 197 } else { 198 palmas_usb->wakeup = true; 199 palmas_usb->enable_id_detection = true; 200 palmas_usb->enable_vbus_detection = true; 201 202 if (pdata) 203 palmas_usb->wakeup = pdata->wakeup; 204 } 205 206 palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", 207 GPIOD_IN); 208 if (PTR_ERR(palmas_usb->id_gpiod) == -EPROBE_DEFER) { 209 return -EPROBE_DEFER; 210 } else if (IS_ERR(palmas_usb->id_gpiod)) { 211 dev_err(&pdev->dev, "failed to get id gpio\n"); 212 return PTR_ERR(palmas_usb->id_gpiod); 213 } 214 215 palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus", 216 GPIOD_IN); 217 if (PTR_ERR(palmas_usb->vbus_gpiod) == -EPROBE_DEFER) { 218 return -EPROBE_DEFER; 219 } else if (IS_ERR(palmas_usb->vbus_gpiod)) { 220 dev_err(&pdev->dev, "failed to get vbus gpio\n"); 221 return PTR_ERR(palmas_usb->vbus_gpiod); 222 } 223 224 if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) { 225 palmas_usb->enable_id_detection = false; 226 palmas_usb->enable_gpio_id_detection = true; 227 } 228 229 if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) { 230 palmas_usb->enable_vbus_detection = false; 231 palmas_usb->enable_gpio_vbus_detection = true; 232 } 233 234 if (palmas_usb->enable_gpio_id_detection) { 235 u32 debounce; 236 237 if (of_property_read_u32(node, "debounce-delay-ms", &debounce)) 238 debounce = USB_GPIO_DEBOUNCE_MS; 239 240 status = gpiod_set_debounce(palmas_usb->id_gpiod, 241 debounce * 1000); 242 if (status < 0) 243 palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce); 244 } 245 246 INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect); 247 248 palmas->usb = palmas_usb; 249 palmas_usb->palmas = palmas; 250 251 palmas_usb->dev = &pdev->dev; 252 253 palmas_usb_wakeup(palmas, palmas_usb->wakeup); 254 255 platform_set_drvdata(pdev, palmas_usb); 256 257 palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev, 258 palmas_extcon_cable); 259 if (IS_ERR(palmas_usb->edev)) { 260 dev_err(&pdev->dev, "failed to allocate extcon device\n"); 261 return -ENOMEM; 262 } 263 264 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev); 265 if (status) { 266 dev_err(&pdev->dev, "failed to register extcon device\n"); 267 return status; 268 } 269 270 if (palmas_usb->enable_id_detection) { 271 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, 272 PALMAS_ID_OTG_IRQ); 273 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, 274 PALMAS_ID_IRQ); 275 status = devm_request_threaded_irq(palmas_usb->dev, 276 palmas_usb->id_irq, 277 NULL, palmas_id_irq_handler, 278 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 279 IRQF_ONESHOT, 280 "palmas_usb_id", palmas_usb); 281 if (status < 0) { 282 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 283 palmas_usb->id_irq, status); 284 return status; 285 } 286 } else if (palmas_usb->enable_gpio_id_detection) { 287 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod); 288 if (palmas_usb->gpio_id_irq < 0) { 289 dev_err(&pdev->dev, "failed to get id irq\n"); 290 return palmas_usb->gpio_id_irq; 291 } 292 status = devm_request_threaded_irq(&pdev->dev, 293 palmas_usb->gpio_id_irq, 294 NULL, 295 palmas_gpio_id_irq_handler, 296 IRQF_TRIGGER_RISING | 297 IRQF_TRIGGER_FALLING | 298 IRQF_ONESHOT, 299 "palmas_usb_id", 300 palmas_usb); 301 if (status < 0) { 302 dev_err(&pdev->dev, 303 "failed to request handler for id irq\n"); 304 return status; 305 } 306 } 307 308 if (palmas_usb->enable_vbus_detection) { 309 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, 310 PALMAS_VBUS_OTG_IRQ); 311 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, 312 PALMAS_VBUS_IRQ); 313 status = devm_request_threaded_irq(palmas_usb->dev, 314 palmas_usb->vbus_irq, NULL, 315 palmas_vbus_irq_handler, 316 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 317 IRQF_ONESHOT, 318 "palmas_usb_vbus", palmas_usb); 319 if (status < 0) { 320 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 321 palmas_usb->vbus_irq, status); 322 return status; 323 } 324 } else if (palmas_usb->enable_gpio_vbus_detection) { 325 /* remux GPIO_1 as VBUSDET */ 326 status = palmas_update_bits(palmas, 327 PALMAS_PU_PD_OD_BASE, 328 PALMAS_PRIMARY_SECONDARY_PAD1, 329 PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK, 330 (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT)); 331 if (status < 0) { 332 dev_err(&pdev->dev, "can't remux GPIO1\n"); 333 return status; 334 } 335 336 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, 337 PALMAS_VBUS_OTG_IRQ); 338 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod); 339 if (palmas_usb->gpio_vbus_irq < 0) { 340 dev_err(&pdev->dev, "failed to get vbus irq\n"); 341 return palmas_usb->gpio_vbus_irq; 342 } 343 status = devm_request_threaded_irq(&pdev->dev, 344 palmas_usb->gpio_vbus_irq, 345 NULL, 346 palmas_vbus_irq_handler, 347 IRQF_TRIGGER_FALLING | 348 IRQF_TRIGGER_RISING | 349 IRQF_ONESHOT, 350 "palmas_usb_vbus", 351 palmas_usb); 352 if (status < 0) { 353 dev_err(&pdev->dev, 354 "failed to request handler for vbus irq\n"); 355 return status; 356 } 357 } 358 359 palmas_enable_irq(palmas_usb); 360 /* perform initial detection */ 361 if (palmas_usb->enable_gpio_vbus_detection) 362 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb); 363 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work); 364 device_set_wakeup_capable(&pdev->dev, true); 365 return 0; 366 } 367 368 static int palmas_usb_remove(struct platform_device *pdev) 369 { 370 struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); 371 372 cancel_delayed_work_sync(&palmas_usb->wq_detectid); 373 374 return 0; 375 } 376 377 #ifdef CONFIG_PM_SLEEP 378 static int palmas_usb_suspend(struct device *dev) 379 { 380 struct palmas_usb *palmas_usb = dev_get_drvdata(dev); 381 382 if (device_may_wakeup(dev)) { 383 if (palmas_usb->enable_vbus_detection) 384 enable_irq_wake(palmas_usb->vbus_irq); 385 if (palmas_usb->enable_gpio_vbus_detection) 386 enable_irq_wake(palmas_usb->gpio_vbus_irq); 387 if (palmas_usb->enable_id_detection) 388 enable_irq_wake(palmas_usb->id_irq); 389 if (palmas_usb->enable_gpio_id_detection) 390 enable_irq_wake(palmas_usb->gpio_id_irq); 391 } 392 return 0; 393 } 394 395 static int palmas_usb_resume(struct device *dev) 396 { 397 struct palmas_usb *palmas_usb = dev_get_drvdata(dev); 398 399 if (device_may_wakeup(dev)) { 400 if (palmas_usb->enable_vbus_detection) 401 disable_irq_wake(palmas_usb->vbus_irq); 402 if (palmas_usb->enable_gpio_vbus_detection) 403 disable_irq_wake(palmas_usb->gpio_vbus_irq); 404 if (palmas_usb->enable_id_detection) 405 disable_irq_wake(palmas_usb->id_irq); 406 if (palmas_usb->enable_gpio_id_detection) 407 disable_irq_wake(palmas_usb->gpio_id_irq); 408 } 409 410 /* check if GPIO states changed while suspend/resume */ 411 if (palmas_usb->enable_gpio_vbus_detection) 412 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb); 413 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work); 414 415 return 0; 416 }; 417 #endif 418 419 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume); 420 421 static const struct of_device_id of_palmas_match_tbl[] = { 422 { .compatible = "ti,palmas-usb", }, 423 { .compatible = "ti,palmas-usb-vid", }, 424 { .compatible = "ti,twl6035-usb", }, 425 { .compatible = "ti,twl6035-usb-vid", }, 426 { /* end */ } 427 }; 428 429 static struct platform_driver palmas_usb_driver = { 430 .probe = palmas_usb_probe, 431 .remove = palmas_usb_remove, 432 .driver = { 433 .name = "palmas-usb", 434 .of_match_table = of_palmas_match_tbl, 435 .pm = &palmas_pm_ops, 436 }, 437 }; 438 439 module_platform_driver(palmas_usb_driver); 440 441 MODULE_ALIAS("platform:palmas-usb"); 442 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); 443 MODULE_DESCRIPTION("Palmas USB transceiver driver"); 444 MODULE_LICENSE("GPL"); 445 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); 446