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_cable_state_(edev, EXTCON_USB, true); 65 dev_info(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_cable_state_(edev, EXTCON_USB, false); 74 dev_info(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_cable_state_(edev, EXTCON_USB_HOST, true); 102 dev_info(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_cable_state_(edev, EXTCON_USB_HOST, false); 110 dev_info(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_cable_state_(edev, EXTCON_USB_HOST, false); 115 dev_info(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_cable_state_(edev, EXTCON_USB_HOST, true); 120 dev_info(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_cable_state_(edev, EXTCON_USB_HOST, false); 141 dev_info(palmas_usb->dev, "USB-HOST cable is detached\n"); 142 } else { 143 extcon_set_cable_state_(edev, EXTCON_USB_HOST, true); 144 dev_info(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 palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); 194 if (!palmas_usb) 195 return -ENOMEM; 196 197 if (node && !pdata) { 198 palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup"); 199 palmas_usb->enable_id_detection = of_property_read_bool(node, 200 "ti,enable-id-detection"); 201 palmas_usb->enable_vbus_detection = of_property_read_bool(node, 202 "ti,enable-vbus-detection"); 203 } else { 204 palmas_usb->wakeup = true; 205 palmas_usb->enable_id_detection = true; 206 palmas_usb->enable_vbus_detection = true; 207 208 if (pdata) 209 palmas_usb->wakeup = pdata->wakeup; 210 } 211 212 palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", 213 GPIOD_IN); 214 if (IS_ERR(palmas_usb->id_gpiod)) { 215 dev_err(&pdev->dev, "failed to get id gpio\n"); 216 return PTR_ERR(palmas_usb->id_gpiod); 217 } 218 219 palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus", 220 GPIOD_IN); 221 if (IS_ERR(palmas_usb->vbus_gpiod)) { 222 dev_err(&pdev->dev, "failed to get vbus gpio\n"); 223 return PTR_ERR(palmas_usb->vbus_gpiod); 224 } 225 226 if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) { 227 palmas_usb->enable_id_detection = false; 228 palmas_usb->enable_gpio_id_detection = true; 229 } 230 231 if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) { 232 palmas_usb->enable_vbus_detection = false; 233 palmas_usb->enable_gpio_vbus_detection = true; 234 } 235 236 if (palmas_usb->enable_gpio_id_detection) { 237 u32 debounce; 238 239 if (of_property_read_u32(node, "debounce-delay-ms", &debounce)) 240 debounce = USB_GPIO_DEBOUNCE_MS; 241 242 status = gpiod_set_debounce(palmas_usb->id_gpiod, 243 debounce * 1000); 244 if (status < 0) 245 palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce); 246 } 247 248 INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect); 249 250 palmas->usb = palmas_usb; 251 palmas_usb->palmas = palmas; 252 253 palmas_usb->dev = &pdev->dev; 254 255 palmas_usb_wakeup(palmas, palmas_usb->wakeup); 256 257 platform_set_drvdata(pdev, palmas_usb); 258 259 palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev, 260 palmas_extcon_cable); 261 if (IS_ERR(palmas_usb->edev)) { 262 dev_err(&pdev->dev, "failed to allocate extcon device\n"); 263 return -ENOMEM; 264 } 265 266 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev); 267 if (status) { 268 dev_err(&pdev->dev, "failed to register extcon device\n"); 269 return status; 270 } 271 272 if (palmas_usb->enable_id_detection) { 273 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, 274 PALMAS_ID_OTG_IRQ); 275 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, 276 PALMAS_ID_IRQ); 277 status = devm_request_threaded_irq(palmas_usb->dev, 278 palmas_usb->id_irq, 279 NULL, palmas_id_irq_handler, 280 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 281 IRQF_ONESHOT, 282 "palmas_usb_id", palmas_usb); 283 if (status < 0) { 284 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 285 palmas_usb->id_irq, status); 286 return status; 287 } 288 } else if (palmas_usb->enable_gpio_id_detection) { 289 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod); 290 if (palmas_usb->gpio_id_irq < 0) { 291 dev_err(&pdev->dev, "failed to get id irq\n"); 292 return palmas_usb->gpio_id_irq; 293 } 294 status = devm_request_threaded_irq(&pdev->dev, 295 palmas_usb->gpio_id_irq, 296 NULL, 297 palmas_gpio_id_irq_handler, 298 IRQF_TRIGGER_RISING | 299 IRQF_TRIGGER_FALLING | 300 IRQF_ONESHOT, 301 "palmas_usb_id", 302 palmas_usb); 303 if (status < 0) { 304 dev_err(&pdev->dev, 305 "failed to request handler for id irq\n"); 306 return status; 307 } 308 } 309 310 if (palmas_usb->enable_vbus_detection) { 311 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, 312 PALMAS_VBUS_OTG_IRQ); 313 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, 314 PALMAS_VBUS_IRQ); 315 status = devm_request_threaded_irq(palmas_usb->dev, 316 palmas_usb->vbus_irq, NULL, 317 palmas_vbus_irq_handler, 318 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 319 IRQF_ONESHOT, 320 "palmas_usb_vbus", palmas_usb); 321 if (status < 0) { 322 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 323 palmas_usb->vbus_irq, status); 324 return status; 325 } 326 } else if (palmas_usb->enable_gpio_vbus_detection) { 327 /* remux GPIO_1 as VBUSDET */ 328 status = palmas_update_bits(palmas, 329 PALMAS_PU_PD_OD_BASE, 330 PALMAS_PRIMARY_SECONDARY_PAD1, 331 PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK, 332 (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT)); 333 if (status < 0) { 334 dev_err(&pdev->dev, "can't remux GPIO1\n"); 335 return status; 336 } 337 338 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, 339 PALMAS_VBUS_OTG_IRQ); 340 palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod); 341 if (palmas_usb->gpio_vbus_irq < 0) { 342 dev_err(&pdev->dev, "failed to get vbus irq\n"); 343 return palmas_usb->gpio_vbus_irq; 344 } 345 status = devm_request_threaded_irq(&pdev->dev, 346 palmas_usb->gpio_vbus_irq, 347 NULL, 348 palmas_vbus_irq_handler, 349 IRQF_TRIGGER_FALLING | 350 IRQF_TRIGGER_RISING | 351 IRQF_ONESHOT, 352 "palmas_usb_vbus", 353 palmas_usb); 354 if (status < 0) { 355 dev_err(&pdev->dev, 356 "failed to request handler for vbus irq\n"); 357 return status; 358 } 359 } 360 361 palmas_enable_irq(palmas_usb); 362 /* perform initial detection */ 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 return 0; 410 }; 411 #endif 412 413 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume); 414 415 static const struct of_device_id of_palmas_match_tbl[] = { 416 { .compatible = "ti,palmas-usb", }, 417 { .compatible = "ti,palmas-usb-vid", }, 418 { .compatible = "ti,twl6035-usb", }, 419 { .compatible = "ti,twl6035-usb-vid", }, 420 { /* end */ } 421 }; 422 423 static struct platform_driver palmas_usb_driver = { 424 .probe = palmas_usb_probe, 425 .remove = palmas_usb_remove, 426 .driver = { 427 .name = "palmas-usb", 428 .of_match_table = of_palmas_match_tbl, 429 .pm = &palmas_pm_ops, 430 }, 431 }; 432 433 module_platform_driver(palmas_usb_driver); 434 435 MODULE_ALIAS("platform:palmas-usb"); 436 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); 437 MODULE_DESCRIPTION("Palmas USB transceiver driver"); 438 MODULE_LICENSE("GPL"); 439 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); 440