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 12#include <linux/devm-helpers.h> 13#include <linux/module.h> 14#include <linux/interrupt.h> 15#include <linux/platform_device.h> 16#include <linux/slab.h> 17#include <linux/err.h> 18#include <linux/mfd/palmas.h> 19#include <linux/of.h> 20#include <linux/of_platform.h> 21#include <linux/gpio/consumer.h> 22#include <linux/workqueue.h> 23 24#define USB_GPIO_DEBOUNCE_MS 20 /* ms */ 25 26static const unsigned int palmas_extcon_cable[] = { 27 EXTCON_USB, 28 EXTCON_USB_HOST, 29 EXTCON_NONE, 30}; 31 32static 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 41static 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 73static 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 115static 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 137static 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 147static 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 174static 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 (IS_ERR(palmas_usb->id_gpiod)) 209 return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->id_gpiod), 210 "failed to get id gpio\n"); 211 212 palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus", 213 GPIOD_IN); 214 if (IS_ERR(palmas_usb->vbus_gpiod)) 215 return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->vbus_gpiod), 216 "failed to get id gpio\n"); 217 218 if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) { 219 palmas_usb->enable_id_detection = false; 220 palmas_usb->enable_gpio_id_detection = true; 221 } 222 223 if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) { 224 palmas_usb->enable_vbus_detection = false; 225 palmas_usb->enable_gpio_vbus_detection = true; 226 } 227 228 if (palmas_usb->enable_gpio_id_detection) { 229 u32 debounce; 230 231 if (of_property_read_u32(node, "debounce-delay-ms", &debounce)) 232 debounce = USB_GPIO_DEBOUNCE_MS; 233 234 status = gpiod_set_debounce(palmas_usb->id_gpiod, 235 debounce * 1000); 236 if (status < 0) 237 palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce); 238 } 239 240 status = devm_delayed_work_autocancel(&pdev->dev, 241 &palmas_usb->wq_detectid, 242 palmas_gpio_id_detect); 243 if (status) 244 return status; 245 246 palmas->usb = palmas_usb; 247 palmas_usb->palmas = palmas; 248 249 palmas_usb->dev = &pdev->dev; 250 251 palmas_usb_wakeup(palmas, palmas_usb->wakeup); 252 253 platform_set_drvdata(pdev, palmas_usb); 254 255 palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev, 256 palmas_extcon_cable); 257 if (IS_ERR(palmas_usb->edev)) { 258 dev_err(&pdev->dev, "failed to allocate extcon device\n"); 259 return -ENOMEM; 260 } 261 262 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev); 263 if (status) { 264 dev_err(&pdev->dev, "failed to register extcon device\n"); 265 return status; 266 } 267 268 if (palmas_usb->enable_id_detection) { 269 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, 270 PALMAS_ID_OTG_IRQ); 271 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, 272 PALMAS_ID_IRQ); 273 status = devm_request_threaded_irq(palmas_usb->dev, 274 palmas_usb->id_irq, 275 NULL, palmas_id_irq_handler, 276 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 277 IRQF_ONESHOT, 278 "palmas_usb_id", palmas_usb); 279 if (status < 0) { 280 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 281 palmas_usb->id_irq, status); 282 return status; 283 } 284 } else if (palmas_usb->enable_gpio_id_detection) { 285 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod); 286 if (palmas_usb->gpio_id_irq < 0) { 287 dev_err(&pdev->dev, "failed to get id irq\n"); 288 return palmas_usb->gpio_id_irq; 289 } 290 status = devm_request_threaded_irq(&pdev->dev, 291 palmas_usb->gpio_id_irq, 292 NULL, 293 palmas_gpio_id_irq_handler, 294 IRQF_TRIGGER_RISING | 295 IRQF_TRIGGER_FALLING | 296 IRQF_ONESHOT, 297 "palmas_usb_id", 298 palmas_usb); 299 if (status < 0) { 300 dev_err(&pdev->dev, 301 "failed to request handler for id irq\n"); 302 return status; 303 } 304 } 305 306 if (palmas_usb->enable_vbus_detection) { 307 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, 308 PALMAS_VBUS_OTG_IRQ); 309 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, 310 PALMAS_VBUS_IRQ); 311 status = devm_request_threaded_irq(palmas_usb->dev, 312 palmas_usb->vbus_irq, NULL, 313 palmas_vbus_irq_handler, 314 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 315 IRQF_ONESHOT, 316 "palmas_usb_vbus", palmas_usb); 317 if (status < 0) { 318 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 319 palmas_usb->vbus_irq, status); 320 return status; 321 } 322 } else if (palmas_usb->enable_gpio_vbus_detection) { 323 /* remux GPIO_1 as VBUSDET */ 324 status = palmas_update_bits(palmas, 325 PALMAS_PU_PD_OD_BASE, 326 PALMAS_PRIMARY_SECONDARY_PAD1, 327 PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK, 328 (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT)); 329 if (status < 0) { 330 dev_err(&pdev->dev, "can't remux GPIO1\n"); 331 return status; 332 } 333 334 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, 335 PALMAS_VBUS_OTG_IRQ); 336 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod); 337 if (palmas_usb->gpio_vbus_irq < 0) { 338 dev_err(&pdev->dev, "failed to get vbus irq\n"); 339 return palmas_usb->gpio_vbus_irq; 340 } 341 status = devm_request_threaded_irq(&pdev->dev, 342 palmas_usb->gpio_vbus_irq, 343 NULL, 344 palmas_vbus_irq_handler, 345 IRQF_TRIGGER_FALLING | 346 IRQF_TRIGGER_RISING | 347 IRQF_ONESHOT, 348 "palmas_usb_vbus", 349 palmas_usb); 350 if (status < 0) { 351 dev_err(&pdev->dev, 352 "failed to request handler for vbus irq\n"); 353 return status; 354 } 355 } 356 357 palmas_enable_irq(palmas_usb); 358 /* perform initial detection */ 359 if (palmas_usb->enable_gpio_vbus_detection) 360 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb); 361 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work); 362 device_set_wakeup_capable(&pdev->dev, true); 363 return 0; 364} 365 366#ifdef CONFIG_PM_SLEEP 367static int palmas_usb_suspend(struct device *dev) 368{ 369 struct palmas_usb *palmas_usb = dev_get_drvdata(dev); 370 371 if (device_may_wakeup(dev)) { 372 if (palmas_usb->enable_vbus_detection) 373 enable_irq_wake(palmas_usb->vbus_irq); 374 if (palmas_usb->enable_gpio_vbus_detection) 375 enable_irq_wake(palmas_usb->gpio_vbus_irq); 376 if (palmas_usb->enable_id_detection) 377 enable_irq_wake(palmas_usb->id_irq); 378 if (palmas_usb->enable_gpio_id_detection) 379 enable_irq_wake(palmas_usb->gpio_id_irq); 380 } 381 return 0; 382} 383 384static int palmas_usb_resume(struct device *dev) 385{ 386 struct palmas_usb *palmas_usb = dev_get_drvdata(dev); 387 388 if (device_may_wakeup(dev)) { 389 if (palmas_usb->enable_vbus_detection) 390 disable_irq_wake(palmas_usb->vbus_irq); 391 if (palmas_usb->enable_gpio_vbus_detection) 392 disable_irq_wake(palmas_usb->gpio_vbus_irq); 393 if (palmas_usb->enable_id_detection) 394 disable_irq_wake(palmas_usb->id_irq); 395 if (palmas_usb->enable_gpio_id_detection) 396 disable_irq_wake(palmas_usb->gpio_id_irq); 397 } 398 399 /* check if GPIO states changed while suspend/resume */ 400 if (palmas_usb->enable_gpio_vbus_detection) 401 palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb); 402 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work); 403 404 return 0; 405}; 406#endif 407 408static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume); 409 410static const struct of_device_id of_palmas_match_tbl[] = { 411 { .compatible = "ti,palmas-usb", }, 412 { .compatible = "ti,palmas-usb-vid", }, 413 { .compatible = "ti,twl6035-usb", }, 414 { .compatible = "ti,twl6035-usb-vid", }, 415 { /* end */ } 416}; 417 418static struct platform_driver palmas_usb_driver = { 419 .probe = palmas_usb_probe, 420 .driver = { 421 .name = "palmas-usb", 422 .of_match_table = of_palmas_match_tbl, 423 .pm = &palmas_pm_ops, 424 }, 425}; 426 427module_platform_driver(palmas_usb_driver); 428 429MODULE_ALIAS("platform:palmas-usb"); 430MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); 431MODULE_DESCRIPTION("Palmas USB transceiver driver"); 432MODULE_LICENSE("GPL"); 433MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); 434