Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 1 | /* |
| 2 | * phy.c -- USB phy handling |
| 3 | * |
| 4 | * Copyright (C) 2004-2013 Texas Instruments |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | */ |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/export.h> |
| 13 | #include <linux/err.h> |
| 14 | #include <linux/device.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/of.h> |
| 18 | |
| 19 | #include <linux/usb/phy.h> |
| 20 | |
Baolin Wang | a9081a0 | 2017-08-15 19:07:54 +0800 | [diff] [blame] | 21 | /* Default current range by charger type. */ |
| 22 | #define DEFAULT_SDP_CUR_MIN 2 |
| 23 | #define DEFAULT_SDP_CUR_MAX 500 |
| 24 | #define DEFAULT_SDP_CUR_MIN_SS 150 |
| 25 | #define DEFAULT_SDP_CUR_MAX_SS 900 |
| 26 | #define DEFAULT_DCP_CUR_MIN 500 |
| 27 | #define DEFAULT_DCP_CUR_MAX 5000 |
| 28 | #define DEFAULT_CDP_CUR_MIN 1500 |
| 29 | #define DEFAULT_CDP_CUR_MAX 5000 |
| 30 | #define DEFAULT_ACA_CUR_MIN 1500 |
| 31 | #define DEFAULT_ACA_CUR_MAX 5000 |
| 32 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 33 | static LIST_HEAD(phy_list); |
| 34 | static LIST_HEAD(phy_bind_list); |
| 35 | static DEFINE_SPINLOCK(phy_lock); |
| 36 | |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 37 | struct phy_devm { |
| 38 | struct usb_phy *phy; |
| 39 | struct notifier_block *nb; |
| 40 | }; |
| 41 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 42 | static struct usb_phy *__usb_find_phy(struct list_head *list, |
| 43 | enum usb_phy_type type) |
| 44 | { |
| 45 | struct usb_phy *phy = NULL; |
| 46 | |
| 47 | list_for_each_entry(phy, list, head) { |
| 48 | if (phy->type != type) |
| 49 | continue; |
| 50 | |
| 51 | return phy; |
| 52 | } |
| 53 | |
Heikki Krogerus | 0df8fc3 | 2015-01-16 10:30:15 +0200 | [diff] [blame] | 54 | return ERR_PTR(-ENODEV); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | static struct usb_phy *__usb_find_phy_dev(struct device *dev, |
| 58 | struct list_head *list, u8 index) |
| 59 | { |
| 60 | struct usb_phy_bind *phy_bind = NULL; |
| 61 | |
| 62 | list_for_each_entry(phy_bind, list, list) { |
| 63 | if (!(strcmp(phy_bind->dev_name, dev_name(dev))) && |
| 64 | phy_bind->index == index) { |
| 65 | if (phy_bind->phy) |
| 66 | return phy_bind->phy; |
| 67 | else |
| 68 | return ERR_PTR(-EPROBE_DEFER); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | return ERR_PTR(-ENODEV); |
| 73 | } |
| 74 | |
| 75 | static struct usb_phy *__of_usb_find_phy(struct device_node *node) |
| 76 | { |
| 77 | struct usb_phy *phy; |
| 78 | |
Thierry Reding | c818a94 | 2014-12-04 13:06:07 +0100 | [diff] [blame] | 79 | if (!of_device_is_available(node)) |
| 80 | return ERR_PTR(-ENODEV); |
| 81 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 82 | list_for_each_entry(phy, &phy_list, head) { |
| 83 | if (node != phy->dev->of_node) |
| 84 | continue; |
| 85 | |
| 86 | return phy; |
| 87 | } |
| 88 | |
Maxime Ripard | 9c9d824 | 2015-01-06 16:45:07 +0100 | [diff] [blame] | 89 | return ERR_PTR(-EPROBE_DEFER); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 90 | } |
| 91 | |
Baolin Wang | a9081a0 | 2017-08-15 19:07:54 +0800 | [diff] [blame] | 92 | static void usb_phy_set_default_current(struct usb_phy *usb_phy) |
| 93 | { |
| 94 | usb_phy->chg_cur.sdp_min = DEFAULT_SDP_CUR_MIN; |
| 95 | usb_phy->chg_cur.sdp_max = DEFAULT_SDP_CUR_MAX; |
| 96 | usb_phy->chg_cur.dcp_min = DEFAULT_DCP_CUR_MIN; |
| 97 | usb_phy->chg_cur.dcp_max = DEFAULT_DCP_CUR_MAX; |
| 98 | usb_phy->chg_cur.cdp_min = DEFAULT_CDP_CUR_MIN; |
| 99 | usb_phy->chg_cur.cdp_max = DEFAULT_CDP_CUR_MAX; |
| 100 | usb_phy->chg_cur.aca_min = DEFAULT_ACA_CUR_MIN; |
| 101 | usb_phy->chg_cur.aca_max = DEFAULT_ACA_CUR_MAX; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * usb_phy_notify_charger_work - notify the USB charger state |
| 106 | * @work - the charger work to notify the USB charger state |
| 107 | * |
| 108 | * This work can be issued when USB charger state has been changed or |
| 109 | * USB charger current has been changed, then we can notify the current |
| 110 | * what can be drawn to power user and the charger state to userspace. |
| 111 | * |
| 112 | * If we get the charger type from extcon subsystem, we can notify the |
| 113 | * charger state to power user automatically by usb_phy_get_charger_type() |
| 114 | * issuing from extcon subsystem. |
| 115 | * |
| 116 | * If we get the charger type from ->charger_detect() instead of extcon |
| 117 | * subsystem, the usb phy driver should issue usb_phy_set_charger_state() |
| 118 | * to set charger state when the charger state has been changed. |
| 119 | */ |
| 120 | static void usb_phy_notify_charger_work(struct work_struct *work) |
| 121 | { |
| 122 | struct usb_phy *usb_phy = container_of(work, struct usb_phy, chg_work); |
| 123 | char uchger_state[50] = { 0 }; |
| 124 | char *envp[] = { uchger_state, NULL }; |
| 125 | unsigned int min, max; |
| 126 | |
| 127 | switch (usb_phy->chg_state) { |
| 128 | case USB_CHARGER_PRESENT: |
| 129 | usb_phy_get_charger_current(usb_phy, &min, &max); |
| 130 | |
| 131 | atomic_notifier_call_chain(&usb_phy->notifier, max, usb_phy); |
| 132 | snprintf(uchger_state, ARRAY_SIZE(uchger_state), |
| 133 | "USB_CHARGER_STATE=%s", "USB_CHARGER_PRESENT"); |
| 134 | break; |
| 135 | case USB_CHARGER_ABSENT: |
| 136 | usb_phy_set_default_current(usb_phy); |
| 137 | |
| 138 | atomic_notifier_call_chain(&usb_phy->notifier, 0, usb_phy); |
| 139 | snprintf(uchger_state, ARRAY_SIZE(uchger_state), |
| 140 | "USB_CHARGER_STATE=%s", "USB_CHARGER_ABSENT"); |
| 141 | break; |
| 142 | default: |
| 143 | dev_warn(usb_phy->dev, "Unknown USB charger state: %d\n", |
| 144 | usb_phy->chg_state); |
| 145 | return; |
| 146 | } |
| 147 | |
| 148 | kobject_uevent_env(&usb_phy->dev->kobj, KOBJ_CHANGE, envp); |
| 149 | } |
| 150 | |
| 151 | static void __usb_phy_get_charger_type(struct usb_phy *usb_phy) |
| 152 | { |
| 153 | if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_SDP) > 0) { |
| 154 | usb_phy->chg_type = SDP_TYPE; |
| 155 | usb_phy->chg_state = USB_CHARGER_PRESENT; |
| 156 | } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_CDP) > 0) { |
| 157 | usb_phy->chg_type = CDP_TYPE; |
| 158 | usb_phy->chg_state = USB_CHARGER_PRESENT; |
| 159 | } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_DCP) > 0) { |
| 160 | usb_phy->chg_type = DCP_TYPE; |
| 161 | usb_phy->chg_state = USB_CHARGER_PRESENT; |
| 162 | } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_ACA) > 0) { |
| 163 | usb_phy->chg_type = ACA_TYPE; |
| 164 | usb_phy->chg_state = USB_CHARGER_PRESENT; |
| 165 | } else { |
| 166 | usb_phy->chg_type = UNKNOWN_TYPE; |
| 167 | usb_phy->chg_state = USB_CHARGER_ABSENT; |
| 168 | } |
| 169 | |
| 170 | schedule_work(&usb_phy->chg_work); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * usb_phy_get_charger_type - get charger type from extcon subsystem |
| 175 | * @nb -the notifier block to determine charger type |
| 176 | * @state - the cable state |
| 177 | * @data - private data |
| 178 | * |
| 179 | * Determin the charger type from extcon subsystem which also means the |
| 180 | * charger state has been chaned, then we should notify this event. |
| 181 | */ |
| 182 | static int usb_phy_get_charger_type(struct notifier_block *nb, |
| 183 | unsigned long state, void *data) |
| 184 | { |
| 185 | struct usb_phy *usb_phy = container_of(nb, struct usb_phy, type_nb); |
| 186 | |
| 187 | __usb_phy_get_charger_type(usb_phy); |
| 188 | return NOTIFY_OK; |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * usb_phy_set_charger_current - set the USB charger current |
| 193 | * @usb_phy - the USB phy to be used |
| 194 | * @mA - the current need to be set |
| 195 | * |
| 196 | * Usually we only change the charger default current when USB finished the |
| 197 | * enumeration as one SDP charger. As one SDP charger, usb_phy_set_power() |
| 198 | * will issue this function to change charger current when after setting USB |
| 199 | * configuration, or suspend/resume USB. For other type charger, we should |
| 200 | * use the default charger current and we do not suggest to issue this function |
| 201 | * to change the charger current. |
| 202 | * |
| 203 | * When USB charger current has been changed, we need to notify the power users. |
| 204 | */ |
| 205 | void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA) |
| 206 | { |
| 207 | switch (usb_phy->chg_type) { |
| 208 | case SDP_TYPE: |
| 209 | if (usb_phy->chg_cur.sdp_max == mA) |
| 210 | return; |
| 211 | |
| 212 | usb_phy->chg_cur.sdp_max = (mA > DEFAULT_SDP_CUR_MAX_SS) ? |
| 213 | DEFAULT_SDP_CUR_MAX_SS : mA; |
| 214 | break; |
| 215 | case DCP_TYPE: |
| 216 | if (usb_phy->chg_cur.dcp_max == mA) |
| 217 | return; |
| 218 | |
| 219 | usb_phy->chg_cur.dcp_max = (mA > DEFAULT_DCP_CUR_MAX) ? |
| 220 | DEFAULT_DCP_CUR_MAX : mA; |
| 221 | break; |
| 222 | case CDP_TYPE: |
| 223 | if (usb_phy->chg_cur.cdp_max == mA) |
| 224 | return; |
| 225 | |
| 226 | usb_phy->chg_cur.cdp_max = (mA > DEFAULT_CDP_CUR_MAX) ? |
| 227 | DEFAULT_CDP_CUR_MAX : mA; |
| 228 | break; |
| 229 | case ACA_TYPE: |
| 230 | if (usb_phy->chg_cur.aca_max == mA) |
| 231 | return; |
| 232 | |
| 233 | usb_phy->chg_cur.aca_max = (mA > DEFAULT_ACA_CUR_MAX) ? |
| 234 | DEFAULT_ACA_CUR_MAX : mA; |
| 235 | break; |
| 236 | default: |
| 237 | return; |
| 238 | } |
| 239 | |
| 240 | schedule_work(&usb_phy->chg_work); |
| 241 | } |
| 242 | EXPORT_SYMBOL_GPL(usb_phy_set_charger_current); |
| 243 | |
| 244 | /** |
| 245 | * usb_phy_get_charger_current - get the USB charger current |
| 246 | * @usb_phy - the USB phy to be used |
| 247 | * @min - the minimum current |
| 248 | * @max - the maximum current |
| 249 | * |
| 250 | * Usually we will notify the maximum current to power user, but for some |
| 251 | * special case, power user also need the minimum current value. Then the |
| 252 | * power user can issue this function to get the suitable current. |
| 253 | */ |
| 254 | void usb_phy_get_charger_current(struct usb_phy *usb_phy, |
| 255 | unsigned int *min, unsigned int *max) |
| 256 | { |
| 257 | switch (usb_phy->chg_type) { |
| 258 | case SDP_TYPE: |
| 259 | *min = usb_phy->chg_cur.sdp_min; |
| 260 | *max = usb_phy->chg_cur.sdp_max; |
| 261 | break; |
| 262 | case DCP_TYPE: |
| 263 | *min = usb_phy->chg_cur.dcp_min; |
| 264 | *max = usb_phy->chg_cur.dcp_max; |
| 265 | break; |
| 266 | case CDP_TYPE: |
| 267 | *min = usb_phy->chg_cur.cdp_min; |
| 268 | *max = usb_phy->chg_cur.cdp_max; |
| 269 | break; |
| 270 | case ACA_TYPE: |
| 271 | *min = usb_phy->chg_cur.aca_min; |
| 272 | *max = usb_phy->chg_cur.aca_max; |
| 273 | break; |
| 274 | default: |
| 275 | *min = 0; |
| 276 | *max = 0; |
| 277 | break; |
| 278 | } |
| 279 | } |
| 280 | EXPORT_SYMBOL_GPL(usb_phy_get_charger_current); |
| 281 | |
| 282 | /** |
| 283 | * usb_phy_set_charger_state - set the USB charger state |
| 284 | * @usb_phy - the USB phy to be used |
| 285 | * @state - the new state need to be set for charger |
| 286 | * |
| 287 | * The usb phy driver can issue this function when the usb phy driver |
| 288 | * detected the charger state has been changed, in this case the charger |
| 289 | * type should be get from ->charger_detect(). |
| 290 | */ |
| 291 | void usb_phy_set_charger_state(struct usb_phy *usb_phy, |
| 292 | enum usb_charger_state state) |
| 293 | { |
| 294 | if (usb_phy->chg_state == state || !usb_phy->charger_detect) |
| 295 | return; |
| 296 | |
| 297 | usb_phy->chg_state = state; |
| 298 | if (usb_phy->chg_state == USB_CHARGER_PRESENT) |
| 299 | usb_phy->chg_type = usb_phy->charger_detect(usb_phy); |
| 300 | else |
| 301 | usb_phy->chg_type = UNKNOWN_TYPE; |
| 302 | |
| 303 | schedule_work(&usb_phy->chg_work); |
| 304 | } |
| 305 | EXPORT_SYMBOL_GPL(usb_phy_set_charger_state); |
| 306 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 307 | static void devm_usb_phy_release(struct device *dev, void *res) |
| 308 | { |
| 309 | struct usb_phy *phy = *(struct usb_phy **)res; |
| 310 | |
| 311 | usb_put_phy(phy); |
| 312 | } |
| 313 | |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 314 | static void devm_usb_phy_release2(struct device *dev, void *_res) |
| 315 | { |
| 316 | struct phy_devm *res = _res; |
| 317 | |
| 318 | if (res->nb) |
| 319 | usb_unregister_notifier(res->phy, res->nb); |
| 320 | usb_put_phy(res->phy); |
| 321 | } |
| 322 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 323 | static int devm_usb_phy_match(struct device *dev, void *res, void *match_data) |
| 324 | { |
Axel Lin | 869aee0 | 2015-03-12 09:15:28 +0800 | [diff] [blame] | 325 | struct usb_phy **phy = res; |
| 326 | |
| 327 | return *phy == match_data; |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 328 | } |
| 329 | |
Baolin Wang | 7d21114 | 2017-05-05 14:12:24 +0800 | [diff] [blame] | 330 | static int usb_add_extcon(struct usb_phy *x) |
| 331 | { |
| 332 | int ret; |
| 333 | |
| 334 | if (of_property_read_bool(x->dev->of_node, "extcon")) { |
| 335 | x->edev = extcon_get_edev_by_phandle(x->dev, 0); |
| 336 | if (IS_ERR(x->edev)) |
| 337 | return PTR_ERR(x->edev); |
| 338 | |
| 339 | x->id_edev = extcon_get_edev_by_phandle(x->dev, 1); |
| 340 | if (IS_ERR(x->id_edev)) { |
| 341 | x->id_edev = NULL; |
| 342 | dev_info(x->dev, "No separate ID extcon device\n"); |
| 343 | } |
| 344 | |
| 345 | if (x->vbus_nb.notifier_call) { |
| 346 | ret = devm_extcon_register_notifier(x->dev, x->edev, |
| 347 | EXTCON_USB, |
| 348 | &x->vbus_nb); |
| 349 | if (ret < 0) { |
| 350 | dev_err(x->dev, |
| 351 | "register VBUS notifier failed\n"); |
| 352 | return ret; |
| 353 | } |
Baolin Wang | a9081a0 | 2017-08-15 19:07:54 +0800 | [diff] [blame] | 354 | } else { |
| 355 | x->type_nb.notifier_call = usb_phy_get_charger_type; |
| 356 | |
| 357 | ret = devm_extcon_register_notifier(x->dev, x->edev, |
| 358 | EXTCON_CHG_USB_SDP, |
| 359 | &x->type_nb); |
| 360 | if (ret) { |
| 361 | dev_err(x->dev, |
| 362 | "register extcon USB SDP failed.\n"); |
| 363 | return ret; |
| 364 | } |
| 365 | |
| 366 | ret = devm_extcon_register_notifier(x->dev, x->edev, |
| 367 | EXTCON_CHG_USB_CDP, |
| 368 | &x->type_nb); |
| 369 | if (ret) { |
| 370 | dev_err(x->dev, |
| 371 | "register extcon USB CDP failed.\n"); |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | ret = devm_extcon_register_notifier(x->dev, x->edev, |
| 376 | EXTCON_CHG_USB_DCP, |
| 377 | &x->type_nb); |
| 378 | if (ret) { |
| 379 | dev_err(x->dev, |
| 380 | "register extcon USB DCP failed.\n"); |
| 381 | return ret; |
| 382 | } |
| 383 | |
| 384 | ret = devm_extcon_register_notifier(x->dev, x->edev, |
| 385 | EXTCON_CHG_USB_ACA, |
| 386 | &x->type_nb); |
| 387 | if (ret) { |
| 388 | dev_err(x->dev, |
| 389 | "register extcon USB ACA failed.\n"); |
| 390 | return ret; |
| 391 | } |
Baolin Wang | 7d21114 | 2017-05-05 14:12:24 +0800 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | if (x->id_nb.notifier_call) { |
| 395 | struct extcon_dev *id_ext; |
| 396 | |
| 397 | if (x->id_edev) |
| 398 | id_ext = x->id_edev; |
| 399 | else |
| 400 | id_ext = x->edev; |
| 401 | |
| 402 | ret = devm_extcon_register_notifier(x->dev, id_ext, |
| 403 | EXTCON_USB_HOST, |
| 404 | &x->id_nb); |
| 405 | if (ret < 0) { |
| 406 | dev_err(x->dev, |
| 407 | "register ID notifier failed\n"); |
| 408 | return ret; |
| 409 | } |
| 410 | } |
| 411 | } |
| 412 | |
Baolin Wang | a9081a0 | 2017-08-15 19:07:54 +0800 | [diff] [blame] | 413 | usb_phy_set_default_current(x); |
| 414 | INIT_WORK(&x->chg_work, usb_phy_notify_charger_work); |
| 415 | x->chg_type = UNKNOWN_TYPE; |
| 416 | x->chg_state = USB_CHARGER_DEFAULT; |
| 417 | if (x->type_nb.notifier_call) |
| 418 | __usb_phy_get_charger_type(x); |
| 419 | |
Baolin Wang | 7d21114 | 2017-05-05 14:12:24 +0800 | [diff] [blame] | 420 | return 0; |
| 421 | } |
| 422 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 423 | /** |
| 424 | * devm_usb_get_phy - find the USB PHY |
| 425 | * @dev - device that requests this phy |
| 426 | * @type - the type of the phy the controller requires |
| 427 | * |
| 428 | * Gets the phy using usb_get_phy(), and associates a device with it using |
| 429 | * devres. On driver detach, release function is invoked on the devres data, |
| 430 | * then, devres data is freed. |
| 431 | * |
| 432 | * For use by USB host and peripheral drivers. |
| 433 | */ |
| 434 | struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type) |
| 435 | { |
| 436 | struct usb_phy **ptr, *phy; |
| 437 | |
| 438 | ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL); |
| 439 | if (!ptr) |
Gabor Juhos | 7f4d1e7 | 2013-10-11 09:01:03 +0200 | [diff] [blame] | 440 | return ERR_PTR(-ENOMEM); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 441 | |
| 442 | phy = usb_get_phy(type); |
| 443 | if (!IS_ERR(phy)) { |
| 444 | *ptr = phy; |
| 445 | devres_add(dev, ptr); |
| 446 | } else |
| 447 | devres_free(ptr); |
| 448 | |
| 449 | return phy; |
| 450 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 451 | EXPORT_SYMBOL_GPL(devm_usb_get_phy); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 452 | |
| 453 | /** |
| 454 | * usb_get_phy - find the USB PHY |
| 455 | * @type - the type of the phy the controller requires |
| 456 | * |
| 457 | * Returns the phy driver, after getting a refcount to it; or |
| 458 | * -ENODEV if there is no such phy. The caller is responsible for |
| 459 | * calling usb_put_phy() to release that count. |
| 460 | * |
| 461 | * For use by USB host and peripheral drivers. |
| 462 | */ |
| 463 | struct usb_phy *usb_get_phy(enum usb_phy_type type) |
| 464 | { |
| 465 | struct usb_phy *phy = NULL; |
| 466 | unsigned long flags; |
| 467 | |
| 468 | spin_lock_irqsave(&phy_lock, flags); |
| 469 | |
| 470 | phy = __usb_find_phy(&phy_list, type); |
| 471 | if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) { |
Josh Boyer | e9d123a | 2014-01-28 09:53:50 -0500 | [diff] [blame] | 472 | pr_debug("PHY: unable to find transceiver of type %s\n", |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 473 | usb_phy_type_string(type)); |
Mathias Krause | 9dc9cb0 | 2014-04-15 07:58:15 +0200 | [diff] [blame] | 474 | if (!IS_ERR(phy)) |
| 475 | phy = ERR_PTR(-ENODEV); |
| 476 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 477 | goto err0; |
| 478 | } |
| 479 | |
| 480 | get_device(phy->dev); |
| 481 | |
| 482 | err0: |
| 483 | spin_unlock_irqrestore(&phy_lock, flags); |
| 484 | |
| 485 | return phy; |
| 486 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 487 | EXPORT_SYMBOL_GPL(usb_get_phy); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 488 | |
Antonio Ospite | fb1928d | 2014-06-04 14:03:42 +0200 | [diff] [blame] | 489 | /** |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 490 | * devm_usb_get_phy_by_node - find the USB PHY by device_node |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 491 | * @dev - device that requests this phy |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 492 | * @node - the device_node for the phy device. |
| 493 | * @nb - a notifier_block to register with the phy. |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 494 | * |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 495 | * Returns the phy driver associated with the given device_node, |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 496 | * after getting a refcount to it, -ENODEV if there is no such phy or |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 497 | * -EPROBE_DEFER if the device is not yet loaded. While at that, it |
| 498 | * also associates the device with |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 499 | * the phy using devres. On driver detach, release function is invoked |
| 500 | * on the devres data, then, devres data is freed. |
| 501 | * |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 502 | * For use by peripheral drivers for devices related to a phy, |
| 503 | * such as a charger. |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 504 | */ |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 505 | struct usb_phy *devm_usb_get_phy_by_node(struct device *dev, |
| 506 | struct device_node *node, |
| 507 | struct notifier_block *nb) |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 508 | { |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 509 | struct usb_phy *phy = ERR_PTR(-ENOMEM); |
| 510 | struct phy_devm *ptr; |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 511 | unsigned long flags; |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 512 | |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 513 | ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 514 | if (!ptr) { |
| 515 | dev_dbg(dev, "failed to allocate memory for devres\n"); |
| 516 | goto err0; |
| 517 | } |
| 518 | |
| 519 | spin_lock_irqsave(&phy_lock, flags); |
| 520 | |
| 521 | phy = __of_usb_find_phy(node); |
Thierry Reding | c818a94 | 2014-12-04 13:06:07 +0100 | [diff] [blame] | 522 | if (IS_ERR(phy)) { |
| 523 | devres_free(ptr); |
| 524 | goto err1; |
| 525 | } |
Arjun Sreedharan | 1290a95 | 2014-11-20 21:23:36 +0530 | [diff] [blame] | 526 | |
Thierry Reding | c818a94 | 2014-12-04 13:06:07 +0100 | [diff] [blame] | 527 | if (!try_module_get(phy->dev->driver->owner)) { |
| 528 | phy = ERR_PTR(-ENODEV); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 529 | devres_free(ptr); |
| 530 | goto err1; |
| 531 | } |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 532 | if (nb) |
| 533 | usb_register_notifier(phy, nb); |
| 534 | ptr->phy = phy; |
| 535 | ptr->nb = nb; |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 536 | devres_add(dev, ptr); |
| 537 | |
| 538 | get_device(phy->dev); |
| 539 | |
| 540 | err1: |
| 541 | spin_unlock_irqrestore(&phy_lock, flags); |
| 542 | |
| 543 | err0: |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 544 | |
| 545 | return phy; |
| 546 | } |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 547 | EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node); |
| 548 | |
| 549 | /** |
| 550 | * devm_usb_get_phy_by_phandle - find the USB PHY by phandle |
| 551 | * @dev - device that requests this phy |
| 552 | * @phandle - name of the property holding the phy phandle value |
| 553 | * @index - the index of the phy |
| 554 | * |
| 555 | * Returns the phy driver associated with the given phandle value, |
| 556 | * after getting a refcount to it, -ENODEV if there is no such phy or |
| 557 | * -EPROBE_DEFER if there is a phandle to the phy, but the device is |
| 558 | * not yet loaded. While at that, it also associates the device with |
| 559 | * the phy using devres. On driver detach, release function is invoked |
| 560 | * on the devres data, then, devres data is freed. |
| 561 | * |
| 562 | * For use by USB host and peripheral drivers. |
| 563 | */ |
| 564 | struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, |
| 565 | const char *phandle, u8 index) |
| 566 | { |
| 567 | struct device_node *node; |
| 568 | struct usb_phy *phy; |
| 569 | |
| 570 | if (!dev->of_node) { |
| 571 | dev_dbg(dev, "device does not have a device node entry\n"); |
| 572 | return ERR_PTR(-EINVAL); |
| 573 | } |
| 574 | |
| 575 | node = of_parse_phandle(dev->of_node, phandle, index); |
| 576 | if (!node) { |
Rob Herring | d9241ff | 2017-07-18 16:43:35 -0500 | [diff] [blame] | 577 | dev_dbg(dev, "failed to get %s phandle in %pOF node\n", phandle, |
| 578 | dev->of_node); |
NeilBrown | e842b84 | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 579 | return ERR_PTR(-ENODEV); |
| 580 | } |
| 581 | phy = devm_usb_get_phy_by_node(dev, node, NULL); |
| 582 | of_node_put(node); |
| 583 | return phy; |
| 584 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 585 | EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 586 | |
| 587 | /** |
| 588 | * usb_get_phy_dev - find the USB PHY |
| 589 | * @dev - device that requests this phy |
| 590 | * @index - the index of the phy |
| 591 | * |
| 592 | * Returns the phy driver, after getting a refcount to it; or |
| 593 | * -ENODEV if there is no such phy. The caller is responsible for |
| 594 | * calling usb_put_phy() to release that count. |
| 595 | * |
| 596 | * For use by USB host and peripheral drivers. |
| 597 | */ |
| 598 | struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index) |
| 599 | { |
| 600 | struct usb_phy *phy = NULL; |
| 601 | unsigned long flags; |
| 602 | |
| 603 | spin_lock_irqsave(&phy_lock, flags); |
| 604 | |
| 605 | phy = __usb_find_phy_dev(dev, &phy_bind_list, index); |
| 606 | if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) { |
Josh Boyer | e9d123a | 2014-01-28 09:53:50 -0500 | [diff] [blame] | 607 | dev_dbg(dev, "unable to find transceiver\n"); |
Arjun Sreedharan | 2c4e3db | 2014-08-18 11:17:33 +0530 | [diff] [blame] | 608 | if (!IS_ERR(phy)) |
| 609 | phy = ERR_PTR(-ENODEV); |
| 610 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 611 | goto err0; |
| 612 | } |
| 613 | |
| 614 | get_device(phy->dev); |
| 615 | |
| 616 | err0: |
| 617 | spin_unlock_irqrestore(&phy_lock, flags); |
| 618 | |
| 619 | return phy; |
| 620 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 621 | EXPORT_SYMBOL_GPL(usb_get_phy_dev); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 622 | |
| 623 | /** |
| 624 | * devm_usb_get_phy_dev - find the USB PHY using device ptr and index |
| 625 | * @dev - device that requests this phy |
| 626 | * @index - the index of the phy |
| 627 | * |
| 628 | * Gets the phy using usb_get_phy_dev(), and associates a device with it using |
| 629 | * devres. On driver detach, release function is invoked on the devres data, |
| 630 | * then, devres data is freed. |
| 631 | * |
| 632 | * For use by USB host and peripheral drivers. |
| 633 | */ |
| 634 | struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index) |
| 635 | { |
| 636 | struct usb_phy **ptr, *phy; |
| 637 | |
| 638 | ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL); |
| 639 | if (!ptr) |
| 640 | return NULL; |
| 641 | |
| 642 | phy = usb_get_phy_dev(dev, index); |
| 643 | if (!IS_ERR(phy)) { |
| 644 | *ptr = phy; |
| 645 | devres_add(dev, ptr); |
| 646 | } else |
| 647 | devres_free(ptr); |
| 648 | |
| 649 | return phy; |
| 650 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 651 | EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 652 | |
| 653 | /** |
| 654 | * devm_usb_put_phy - release the USB PHY |
| 655 | * @dev - device that wants to release this phy |
| 656 | * @phy - the phy returned by devm_usb_get_phy() |
| 657 | * |
| 658 | * destroys the devres associated with this phy and invokes usb_put_phy |
| 659 | * to release the phy. |
| 660 | * |
| 661 | * For use by USB host and peripheral drivers. |
| 662 | */ |
| 663 | void devm_usb_put_phy(struct device *dev, struct usb_phy *phy) |
| 664 | { |
| 665 | int r; |
| 666 | |
| 667 | r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy); |
| 668 | dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); |
| 669 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 670 | EXPORT_SYMBOL_GPL(devm_usb_put_phy); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 671 | |
| 672 | /** |
| 673 | * usb_put_phy - release the USB PHY |
| 674 | * @x: the phy returned by usb_get_phy() |
| 675 | * |
| 676 | * Releases a refcount the caller received from usb_get_phy(). |
| 677 | * |
| 678 | * For use by USB host and peripheral drivers. |
| 679 | */ |
| 680 | void usb_put_phy(struct usb_phy *x) |
| 681 | { |
| 682 | if (x) { |
| 683 | struct module *owner = x->dev->driver->owner; |
| 684 | |
| 685 | put_device(x->dev); |
| 686 | module_put(owner); |
| 687 | } |
| 688 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 689 | EXPORT_SYMBOL_GPL(usb_put_phy); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 690 | |
| 691 | /** |
| 692 | * usb_add_phy - declare the USB PHY |
| 693 | * @x: the USB phy to be used; or NULL |
| 694 | * @type - the type of this PHY |
| 695 | * |
| 696 | * This call is exclusively for use by phy drivers, which |
| 697 | * coordinate the activities of drivers for host and peripheral |
| 698 | * controllers, and in some cases for VBUS current regulation. |
| 699 | */ |
| 700 | int usb_add_phy(struct usb_phy *x, enum usb_phy_type type) |
| 701 | { |
| 702 | int ret = 0; |
| 703 | unsigned long flags; |
| 704 | struct usb_phy *phy; |
| 705 | |
| 706 | if (x->type != USB_PHY_TYPE_UNDEFINED) { |
| 707 | dev_err(x->dev, "not accepting initialized PHY %s\n", x->label); |
| 708 | return -EINVAL; |
| 709 | } |
| 710 | |
Baolin Wang | 7d21114 | 2017-05-05 14:12:24 +0800 | [diff] [blame] | 711 | ret = usb_add_extcon(x); |
| 712 | if (ret) |
| 713 | return ret; |
| 714 | |
Neil Zhang | 31e3222 | 2013-12-11 14:45:14 +0800 | [diff] [blame] | 715 | ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier); |
| 716 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 717 | spin_lock_irqsave(&phy_lock, flags); |
| 718 | |
| 719 | list_for_each_entry(phy, &phy_list, head) { |
| 720 | if (phy->type == type) { |
| 721 | ret = -EBUSY; |
| 722 | dev_err(x->dev, "transceiver type %s already exists\n", |
| 723 | usb_phy_type_string(type)); |
| 724 | goto out; |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | x->type = type; |
| 729 | list_add_tail(&x->head, &phy_list); |
| 730 | |
| 731 | out: |
| 732 | spin_unlock_irqrestore(&phy_lock, flags); |
| 733 | return ret; |
| 734 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 735 | EXPORT_SYMBOL_GPL(usb_add_phy); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 736 | |
| 737 | /** |
| 738 | * usb_add_phy_dev - declare the USB PHY |
| 739 | * @x: the USB phy to be used; or NULL |
| 740 | * |
| 741 | * This call is exclusively for use by phy drivers, which |
| 742 | * coordinate the activities of drivers for host and peripheral |
| 743 | * controllers, and in some cases for VBUS current regulation. |
| 744 | */ |
| 745 | int usb_add_phy_dev(struct usb_phy *x) |
| 746 | { |
| 747 | struct usb_phy_bind *phy_bind; |
| 748 | unsigned long flags; |
Baolin Wang | 7d21114 | 2017-05-05 14:12:24 +0800 | [diff] [blame] | 749 | int ret; |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 750 | |
| 751 | if (!x->dev) { |
| 752 | dev_err(x->dev, "no device provided for PHY\n"); |
| 753 | return -EINVAL; |
| 754 | } |
| 755 | |
Baolin Wang | 7d21114 | 2017-05-05 14:12:24 +0800 | [diff] [blame] | 756 | ret = usb_add_extcon(x); |
| 757 | if (ret) |
| 758 | return ret; |
| 759 | |
Neil Zhang | 31e3222 | 2013-12-11 14:45:14 +0800 | [diff] [blame] | 760 | ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier); |
| 761 | |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 762 | spin_lock_irqsave(&phy_lock, flags); |
| 763 | list_for_each_entry(phy_bind, &phy_bind_list, list) |
| 764 | if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev)))) |
| 765 | phy_bind->phy = x; |
| 766 | |
| 767 | list_add_tail(&x->head, &phy_list); |
| 768 | |
| 769 | spin_unlock_irqrestore(&phy_lock, flags); |
| 770 | return 0; |
| 771 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 772 | EXPORT_SYMBOL_GPL(usb_add_phy_dev); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 773 | |
| 774 | /** |
| 775 | * usb_remove_phy - remove the OTG PHY |
| 776 | * @x: the USB OTG PHY to be removed; |
| 777 | * |
| 778 | * This reverts the effects of usb_add_phy |
| 779 | */ |
| 780 | void usb_remove_phy(struct usb_phy *x) |
| 781 | { |
| 782 | unsigned long flags; |
| 783 | struct usb_phy_bind *phy_bind; |
| 784 | |
| 785 | spin_lock_irqsave(&phy_lock, flags); |
| 786 | if (x) { |
| 787 | list_for_each_entry(phy_bind, &phy_bind_list, list) |
| 788 | if (phy_bind->phy == x) |
| 789 | phy_bind->phy = NULL; |
| 790 | list_del(&x->head); |
| 791 | } |
| 792 | spin_unlock_irqrestore(&phy_lock, flags); |
| 793 | } |
Felipe Balbi | 110ff6d0 | 2013-03-07 10:49:27 +0200 | [diff] [blame] | 794 | EXPORT_SYMBOL_GPL(usb_remove_phy); |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 795 | |
| 796 | /** |
| 797 | * usb_bind_phy - bind the phy and the controller that uses the phy |
| 798 | * @dev_name: the device name of the device that will bind to the phy |
| 799 | * @index: index to specify the port number |
| 800 | * @phy_dev_name: the device name of the phy |
| 801 | * |
| 802 | * Fills the phy_bind structure with the dev_name and phy_dev_name. This will |
| 803 | * be used when the phy driver registers the phy and when the controller |
| 804 | * requests this phy. |
| 805 | * |
| 806 | * To be used by platform specific initialization code. |
| 807 | */ |
Denis Efremov | 19d8ced | 2013-04-18 17:13:31 +0400 | [diff] [blame] | 808 | int usb_bind_phy(const char *dev_name, u8 index, |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 809 | const char *phy_dev_name) |
| 810 | { |
| 811 | struct usb_phy_bind *phy_bind; |
| 812 | unsigned long flags; |
| 813 | |
| 814 | phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL); |
Josh Boyer | e9d123a | 2014-01-28 09:53:50 -0500 | [diff] [blame] | 815 | if (!phy_bind) |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 816 | return -ENOMEM; |
Sascha Hauer | cedf860 | 2013-02-27 15:16:28 +0100 | [diff] [blame] | 817 | |
| 818 | phy_bind->dev_name = dev_name; |
| 819 | phy_bind->phy_dev_name = phy_dev_name; |
| 820 | phy_bind->index = index; |
| 821 | |
| 822 | spin_lock_irqsave(&phy_lock, flags); |
| 823 | list_add_tail(&phy_bind->list, &phy_bind_list); |
| 824 | spin_unlock_irqrestore(&phy_lock, flags); |
| 825 | |
| 826 | return 0; |
| 827 | } |
| 828 | EXPORT_SYMBOL_GPL(usb_bind_phy); |
Kiran Raparthy | df9f7b3 | 2014-11-21 11:31:20 +0530 | [diff] [blame] | 829 | |
| 830 | /** |
| 831 | * usb_phy_set_event - set event to phy event |
| 832 | * @x: the phy returned by usb_get_phy(); |
| 833 | * |
| 834 | * This sets event to phy event |
| 835 | */ |
| 836 | void usb_phy_set_event(struct usb_phy *x, unsigned long event) |
| 837 | { |
| 838 | x->last_event = event; |
| 839 | } |
| 840 | EXPORT_SYMBOL_GPL(usb_phy_set_event); |