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 if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) { 220 palmas_usb->enable_id_detection = false; 221 palmas_usb->enable_gpio_id_detection = true; 222 } 223 224 if (palmas_usb->enable_gpio_id_detection) { 225 u32 debounce; 226 227 if (of_property_read_u32(node, "debounce-delay-ms", &debounce)) 228 debounce = USB_GPIO_DEBOUNCE_MS; 229 230 status = gpiod_set_debounce(palmas_usb->id_gpiod, 231 debounce * 1000); 232 if (status < 0) 233 palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce); 234 } 235 236 INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect); 237 238 palmas->usb = palmas_usb; 239 palmas_usb->palmas = palmas; 240 241 palmas_usb->dev = &pdev->dev; 242 243 palmas_usb_wakeup(palmas, palmas_usb->wakeup); 244 245 platform_set_drvdata(pdev, palmas_usb); 246 247 palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev, 248 palmas_extcon_cable); 249 if (IS_ERR(palmas_usb->edev)) { 250 dev_err(&pdev->dev, "failed to allocate extcon device\n"); 251 return -ENOMEM; 252 } 253 254 status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev); 255 if (status) { 256 dev_err(&pdev->dev, "failed to register extcon device\n"); 257 return status; 258 } 259 260 if (palmas_usb->enable_id_detection) { 261 palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, 262 PALMAS_ID_OTG_IRQ); 263 palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, 264 PALMAS_ID_IRQ); 265 status = devm_request_threaded_irq(palmas_usb->dev, 266 palmas_usb->id_irq, 267 NULL, palmas_id_irq_handler, 268 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 269 IRQF_ONESHOT | IRQF_EARLY_RESUME, 270 "palmas_usb_id", palmas_usb); 271 if (status < 0) { 272 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 273 palmas_usb->id_irq, status); 274 return status; 275 } 276 } else if (palmas_usb->enable_gpio_id_detection) { 277 palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod); 278 if (palmas_usb->gpio_id_irq < 0) { 279 dev_err(&pdev->dev, "failed to get id irq\n"); 280 return palmas_usb->gpio_id_irq; 281 } 282 status = devm_request_threaded_irq(&pdev->dev, 283 palmas_usb->gpio_id_irq, 284 NULL, 285 palmas_gpio_id_irq_handler, 286 IRQF_TRIGGER_RISING | 287 IRQF_TRIGGER_FALLING | 288 IRQF_ONESHOT, 289 "palmas_usb_id", 290 palmas_usb); 291 if (status < 0) { 292 dev_err(&pdev->dev, 293 "failed to request handler for id irq\n"); 294 return status; 295 } 296 } 297 298 if (palmas_usb->enable_vbus_detection) { 299 palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, 300 PALMAS_VBUS_OTG_IRQ); 301 palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, 302 PALMAS_VBUS_IRQ); 303 status = devm_request_threaded_irq(palmas_usb->dev, 304 palmas_usb->vbus_irq, NULL, 305 palmas_vbus_irq_handler, 306 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 307 IRQF_ONESHOT | IRQF_EARLY_RESUME, 308 "palmas_usb_vbus", palmas_usb); 309 if (status < 0) { 310 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", 311 palmas_usb->vbus_irq, status); 312 return status; 313 } 314 } 315 316 palmas_enable_irq(palmas_usb); 317 /* perform initial detection */ 318 palmas_gpio_id_detect(&palmas_usb->wq_detectid.work); 319 device_set_wakeup_capable(&pdev->dev, true); 320 return 0; 321 } 322 323 static int palmas_usb_remove(struct platform_device *pdev) 324 { 325 struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); 326 327 cancel_delayed_work_sync(&palmas_usb->wq_detectid); 328 329 return 0; 330 } 331 332 #ifdef CONFIG_PM_SLEEP 333 static int palmas_usb_suspend(struct device *dev) 334 { 335 struct palmas_usb *palmas_usb = dev_get_drvdata(dev); 336 337 if (device_may_wakeup(dev)) { 338 if (palmas_usb->enable_vbus_detection) 339 enable_irq_wake(palmas_usb->vbus_irq); 340 if (palmas_usb->enable_id_detection) 341 enable_irq_wake(palmas_usb->id_irq); 342 if (palmas_usb->enable_gpio_id_detection) 343 enable_irq_wake(palmas_usb->gpio_id_irq); 344 } 345 return 0; 346 } 347 348 static int palmas_usb_resume(struct device *dev) 349 { 350 struct palmas_usb *palmas_usb = dev_get_drvdata(dev); 351 352 if (device_may_wakeup(dev)) { 353 if (palmas_usb->enable_vbus_detection) 354 disable_irq_wake(palmas_usb->vbus_irq); 355 if (palmas_usb->enable_id_detection) 356 disable_irq_wake(palmas_usb->id_irq); 357 if (palmas_usb->enable_gpio_id_detection) 358 disable_irq_wake(palmas_usb->gpio_id_irq); 359 } 360 return 0; 361 }; 362 #endif 363 364 static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume); 365 366 static const struct of_device_id of_palmas_match_tbl[] = { 367 { .compatible = "ti,palmas-usb", }, 368 { .compatible = "ti,palmas-usb-vid", }, 369 { .compatible = "ti,twl6035-usb", }, 370 { .compatible = "ti,twl6035-usb-vid", }, 371 { /* end */ } 372 }; 373 374 static struct platform_driver palmas_usb_driver = { 375 .probe = palmas_usb_probe, 376 .remove = palmas_usb_remove, 377 .driver = { 378 .name = "palmas-usb", 379 .of_match_table = of_palmas_match_tbl, 380 .pm = &palmas_pm_ops, 381 }, 382 }; 383 384 module_platform_driver(palmas_usb_driver); 385 386 MODULE_ALIAS("platform:palmas-usb"); 387 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); 388 MODULE_DESCRIPTION("Palmas USB transceiver driver"); 389 MODULE_LICENSE("GPL"); 390 MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); 391