1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Extcon charger detection driver for Intel Cherrytrail Whiskey Cove PMIC 4 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com> 5 * 6 * Based on various non upstream patches to support the CHT Whiskey Cove PMIC: 7 * Copyright (C) 2013-2015 Intel Corporation. All rights reserved. 8 */ 9 10 #include <linux/extcon-provider.h> 11 #include <linux/interrupt.h> 12 #include <linux/kernel.h> 13 #include <linux/mfd/intel_soc_pmic.h> 14 #include <linux/module.h> 15 #include <linux/mod_devicetable.h> 16 #include <linux/platform_device.h> 17 #include <linux/regmap.h> 18 #include <linux/slab.h> 19 20 #include "extcon-intel.h" 21 22 #define CHT_WC_PHYCTRL 0x5e07 23 24 #define CHT_WC_CHGRCTRL0 0x5e16 25 #define CHT_WC_CHGRCTRL0_CHGRRESET BIT(0) 26 #define CHT_WC_CHGRCTRL0_EMRGCHREN BIT(1) 27 #define CHT_WC_CHGRCTRL0_EXTCHRDIS BIT(2) 28 #define CHT_WC_CHGRCTRL0_SWCONTROL BIT(3) 29 #define CHT_WC_CHGRCTRL0_TTLCK BIT(4) 30 #define CHT_WC_CHGRCTRL0_CCSM_OFF BIT(5) 31 #define CHT_WC_CHGRCTRL0_DBPOFF BIT(6) 32 #define CHT_WC_CHGRCTRL0_CHR_WDT_NOKICK BIT(7) 33 34 #define CHT_WC_CHGRCTRL1 0x5e17 35 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_100 BIT(0) 36 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_150 BIT(1) 37 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_500 BIT(2) 38 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_900 BIT(3) 39 #define CHT_WC_CHGRCTRL1_FUSB_INLMT_1500 BIT(4) 40 #define CHT_WC_CHGRCTRL1_FTEMP_EVENT BIT(5) 41 #define CHT_WC_CHGRCTRL1_OTGMODE BIT(6) 42 #define CHT_WC_CHGRCTRL1_DBPEN BIT(7) 43 44 #define CHT_WC_USBSRC 0x5e29 45 #define CHT_WC_USBSRC_STS_MASK GENMASK(1, 0) 46 #define CHT_WC_USBSRC_STS_SUCCESS 2 47 #define CHT_WC_USBSRC_STS_FAIL 3 48 #define CHT_WC_USBSRC_TYPE_SHIFT 2 49 #define CHT_WC_USBSRC_TYPE_MASK GENMASK(5, 2) 50 #define CHT_WC_USBSRC_TYPE_NONE 0 51 #define CHT_WC_USBSRC_TYPE_SDP 1 52 #define CHT_WC_USBSRC_TYPE_DCP 2 53 #define CHT_WC_USBSRC_TYPE_CDP 3 54 #define CHT_WC_USBSRC_TYPE_ACA 4 55 #define CHT_WC_USBSRC_TYPE_SE1 5 56 #define CHT_WC_USBSRC_TYPE_MHL 6 57 #define CHT_WC_USBSRC_TYPE_FLOATING 7 58 #define CHT_WC_USBSRC_TYPE_OTHER 8 59 #define CHT_WC_USBSRC_TYPE_DCP_EXTPHY 9 60 61 #define CHT_WC_CHGDISCTRL 0x5e2f 62 #define CHT_WC_CHGDISCTRL_OUT BIT(0) 63 /* 0 - open drain, 1 - regular push-pull output */ 64 #define CHT_WC_CHGDISCTRL_DRV BIT(4) 65 /* 0 - pin is controlled by SW, 1 - by HW */ 66 #define CHT_WC_CHGDISCTRL_FN BIT(6) 67 68 #define CHT_WC_PWRSRC_IRQ 0x6e03 69 #define CHT_WC_PWRSRC_IRQ_MASK 0x6e0f 70 #define CHT_WC_PWRSRC_STS 0x6e1e 71 #define CHT_WC_PWRSRC_VBUS BIT(0) 72 #define CHT_WC_PWRSRC_DC BIT(1) 73 #define CHT_WC_PWRSRC_BATT BIT(2) 74 #define CHT_WC_PWRSRC_USBID_MASK GENMASK(4, 3) 75 #define CHT_WC_PWRSRC_USBID_SHIFT 3 76 #define CHT_WC_PWRSRC_RID_ACA 0 77 #define CHT_WC_PWRSRC_RID_GND 1 78 #define CHT_WC_PWRSRC_RID_FLOAT 2 79 80 #define CHT_WC_VBUS_GPIO_CTLO 0x6e2d 81 #define CHT_WC_VBUS_GPIO_CTLO_OUTPUT BIT(0) 82 #define CHT_WC_VBUS_GPIO_CTLO_DRV_OD BIT(4) 83 #define CHT_WC_VBUS_GPIO_CTLO_DIR_OUT BIT(5) 84 85 enum cht_wc_mux_select { 86 MUX_SEL_PMIC = 0, 87 MUX_SEL_SOC, 88 }; 89 90 static const unsigned int cht_wc_extcon_cables[] = { 91 EXTCON_USB, 92 EXTCON_USB_HOST, 93 EXTCON_CHG_USB_SDP, 94 EXTCON_CHG_USB_CDP, 95 EXTCON_CHG_USB_DCP, 96 EXTCON_CHG_USB_ACA, 97 EXTCON_NONE, 98 }; 99 100 struct cht_wc_extcon_data { 101 struct device *dev; 102 struct regmap *regmap; 103 struct extcon_dev *edev; 104 unsigned int previous_cable; 105 bool usb_host; 106 }; 107 108 static int cht_wc_extcon_get_id(struct cht_wc_extcon_data *ext, int pwrsrc_sts) 109 { 110 switch ((pwrsrc_sts & CHT_WC_PWRSRC_USBID_MASK) >> CHT_WC_PWRSRC_USBID_SHIFT) { 111 case CHT_WC_PWRSRC_RID_GND: 112 return INTEL_USB_ID_GND; 113 case CHT_WC_PWRSRC_RID_FLOAT: 114 return INTEL_USB_ID_FLOAT; 115 case CHT_WC_PWRSRC_RID_ACA: 116 default: 117 /* 118 * Once we have IIO support for the GPADC we should read 119 * the USBID GPADC channel here and determine ACA role 120 * based on that. 121 */ 122 return INTEL_USB_ID_FLOAT; 123 } 124 } 125 126 static int cht_wc_extcon_get_charger(struct cht_wc_extcon_data *ext, 127 bool ignore_errors) 128 { 129 int ret, usbsrc, status; 130 unsigned long timeout; 131 132 /* Charger detection can take upto 600ms, wait 800ms max. */ 133 timeout = jiffies + msecs_to_jiffies(800); 134 do { 135 ret = regmap_read(ext->regmap, CHT_WC_USBSRC, &usbsrc); 136 if (ret) { 137 dev_err(ext->dev, "Error reading usbsrc: %d\n", ret); 138 return ret; 139 } 140 141 status = usbsrc & CHT_WC_USBSRC_STS_MASK; 142 if (status == CHT_WC_USBSRC_STS_SUCCESS || 143 status == CHT_WC_USBSRC_STS_FAIL) 144 break; 145 146 msleep(50); /* Wait a bit before retrying */ 147 } while (time_before(jiffies, timeout)); 148 149 if (status != CHT_WC_USBSRC_STS_SUCCESS) { 150 if (ignore_errors) 151 return EXTCON_CHG_USB_SDP; /* Save fallback */ 152 153 if (status == CHT_WC_USBSRC_STS_FAIL) 154 dev_warn(ext->dev, "Could not detect charger type\n"); 155 else 156 dev_warn(ext->dev, "Timeout detecting charger type\n"); 157 return EXTCON_CHG_USB_SDP; /* Save fallback */ 158 } 159 160 usbsrc = (usbsrc & CHT_WC_USBSRC_TYPE_MASK) >> CHT_WC_USBSRC_TYPE_SHIFT; 161 switch (usbsrc) { 162 default: 163 dev_warn(ext->dev, 164 "Unhandled charger type %d, defaulting to SDP\n", 165 ret); 166 return EXTCON_CHG_USB_SDP; 167 case CHT_WC_USBSRC_TYPE_SDP: 168 case CHT_WC_USBSRC_TYPE_FLOATING: 169 case CHT_WC_USBSRC_TYPE_OTHER: 170 return EXTCON_CHG_USB_SDP; 171 case CHT_WC_USBSRC_TYPE_CDP: 172 return EXTCON_CHG_USB_CDP; 173 case CHT_WC_USBSRC_TYPE_DCP: 174 case CHT_WC_USBSRC_TYPE_DCP_EXTPHY: 175 case CHT_WC_USBSRC_TYPE_MHL: /* MHL2+ delivers upto 2A, treat as DCP */ 176 return EXTCON_CHG_USB_DCP; 177 case CHT_WC_USBSRC_TYPE_ACA: 178 return EXTCON_CHG_USB_ACA; 179 } 180 } 181 182 static void cht_wc_extcon_set_phymux(struct cht_wc_extcon_data *ext, u8 state) 183 { 184 int ret; 185 186 ret = regmap_write(ext->regmap, CHT_WC_PHYCTRL, state); 187 if (ret) 188 dev_err(ext->dev, "Error writing phyctrl: %d\n", ret); 189 } 190 191 static void cht_wc_extcon_set_5v_boost(struct cht_wc_extcon_data *ext, 192 bool enable) 193 { 194 int ret, val; 195 196 /* 197 * The 5V boost converter is enabled through a gpio on the PMIC, since 198 * there currently is no gpio driver we access the gpio reg directly. 199 */ 200 val = CHT_WC_VBUS_GPIO_CTLO_DRV_OD | CHT_WC_VBUS_GPIO_CTLO_DIR_OUT; 201 if (enable) 202 val |= CHT_WC_VBUS_GPIO_CTLO_OUTPUT; 203 204 ret = regmap_write(ext->regmap, CHT_WC_VBUS_GPIO_CTLO, val); 205 if (ret) 206 dev_err(ext->dev, "Error writing Vbus GPIO CTLO: %d\n", ret); 207 } 208 209 static void cht_wc_extcon_set_otgmode(struct cht_wc_extcon_data *ext, 210 bool enable) 211 { 212 unsigned int val = enable ? CHT_WC_CHGRCTRL1_OTGMODE : 0; 213 int ret; 214 215 ret = regmap_update_bits(ext->regmap, CHT_WC_CHGRCTRL1, 216 CHT_WC_CHGRCTRL1_OTGMODE, val); 217 if (ret) 218 dev_err(ext->dev, "Error updating CHGRCTRL1 reg: %d\n", ret); 219 } 220 221 static void cht_wc_extcon_enable_charging(struct cht_wc_extcon_data *ext, 222 bool enable) 223 { 224 unsigned int val = enable ? 0 : CHT_WC_CHGDISCTRL_OUT; 225 int ret; 226 227 ret = regmap_update_bits(ext->regmap, CHT_WC_CHGDISCTRL, 228 CHT_WC_CHGDISCTRL_OUT, val); 229 if (ret) 230 dev_err(ext->dev, "Error updating CHGDISCTRL reg: %d\n", ret); 231 } 232 233 /* Small helper to sync EXTCON_CHG_USB_SDP and EXTCON_USB state */ 234 static void cht_wc_extcon_set_state(struct cht_wc_extcon_data *ext, 235 unsigned int cable, bool state) 236 { 237 extcon_set_state_sync(ext->edev, cable, state); 238 if (cable == EXTCON_CHG_USB_SDP) 239 extcon_set_state_sync(ext->edev, EXTCON_USB, state); 240 } 241 242 static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext) 243 { 244 int ret, pwrsrc_sts, id; 245 unsigned int cable = EXTCON_NONE; 246 /* Ignore errors in host mode, as the 5v boost converter is on then */ 247 bool ignore_get_charger_errors = ext->usb_host; 248 249 ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts); 250 if (ret) { 251 dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret); 252 return; 253 } 254 255 id = cht_wc_extcon_get_id(ext, pwrsrc_sts); 256 if (id == INTEL_USB_ID_GND) { 257 cht_wc_extcon_enable_charging(ext, false); 258 cht_wc_extcon_set_otgmode(ext, true); 259 260 /* The 5v boost causes a false VBUS / SDP detect, skip */ 261 goto charger_det_done; 262 } 263 264 cht_wc_extcon_set_otgmode(ext, false); 265 cht_wc_extcon_enable_charging(ext, true); 266 267 /* Plugged into a host/charger or not connected? */ 268 if (!(pwrsrc_sts & CHT_WC_PWRSRC_VBUS)) { 269 /* Route D+ and D- to PMIC for future charger detection */ 270 cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC); 271 goto set_state; 272 } 273 274 ret = cht_wc_extcon_get_charger(ext, ignore_get_charger_errors); 275 if (ret >= 0) 276 cable = ret; 277 278 charger_det_done: 279 /* Route D+ and D- to SoC for the host or gadget controller */ 280 cht_wc_extcon_set_phymux(ext, MUX_SEL_SOC); 281 282 set_state: 283 if (cable != ext->previous_cable) { 284 cht_wc_extcon_set_state(ext, cable, true); 285 cht_wc_extcon_set_state(ext, ext->previous_cable, false); 286 ext->previous_cable = cable; 287 } 288 289 ext->usb_host = ((id == INTEL_USB_ID_GND) || (id == INTEL_USB_RID_A)); 290 extcon_set_state_sync(ext->edev, EXTCON_USB_HOST, ext->usb_host); 291 } 292 293 static irqreturn_t cht_wc_extcon_isr(int irq, void *data) 294 { 295 struct cht_wc_extcon_data *ext = data; 296 int ret, irqs; 297 298 ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_IRQ, &irqs); 299 if (ret) { 300 dev_err(ext->dev, "Error reading irqs: %d\n", ret); 301 return IRQ_NONE; 302 } 303 304 cht_wc_extcon_pwrsrc_event(ext); 305 306 ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ, irqs); 307 if (ret) { 308 dev_err(ext->dev, "Error writing irqs: %d\n", ret); 309 return IRQ_NONE; 310 } 311 312 return IRQ_HANDLED; 313 } 314 315 static int cht_wc_extcon_sw_control(struct cht_wc_extcon_data *ext, bool enable) 316 { 317 int ret, mask, val; 318 319 val = enable ? 0 : CHT_WC_CHGDISCTRL_FN; 320 ret = regmap_update_bits(ext->regmap, CHT_WC_CHGDISCTRL, 321 CHT_WC_CHGDISCTRL_FN, val); 322 if (ret) 323 dev_err(ext->dev, 324 "Error setting sw control for CHGDIS pin: %d\n", 325 ret); 326 327 mask = CHT_WC_CHGRCTRL0_SWCONTROL | CHT_WC_CHGRCTRL0_CCSM_OFF; 328 val = enable ? mask : 0; 329 ret = regmap_update_bits(ext->regmap, CHT_WC_CHGRCTRL0, mask, val); 330 if (ret) 331 dev_err(ext->dev, "Error setting sw control: %d\n", ret); 332 333 return ret; 334 } 335 336 static int cht_wc_extcon_probe(struct platform_device *pdev) 337 { 338 struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent); 339 struct cht_wc_extcon_data *ext; 340 unsigned long mask = ~(CHT_WC_PWRSRC_VBUS | CHT_WC_PWRSRC_USBID_MASK); 341 int pwrsrc_sts, id; 342 int irq, ret; 343 344 irq = platform_get_irq(pdev, 0); 345 if (irq < 0) 346 return irq; 347 348 ext = devm_kzalloc(&pdev->dev, sizeof(*ext), GFP_KERNEL); 349 if (!ext) 350 return -ENOMEM; 351 352 ext->dev = &pdev->dev; 353 ext->regmap = pmic->regmap; 354 ext->previous_cable = EXTCON_NONE; 355 356 /* Initialize extcon device */ 357 ext->edev = devm_extcon_dev_allocate(ext->dev, cht_wc_extcon_cables); 358 if (IS_ERR(ext->edev)) 359 return PTR_ERR(ext->edev); 360 361 /* 362 * When a host-cable is detected the BIOS enables an external 5v boost 363 * converter to power connected devices there are 2 problems with this: 364 * 1) This gets seen by the external battery charger as a valid Vbus 365 * supply and it then tries to feed Vsys from this creating a 366 * feedback loop which causes aprox. 300 mA extra battery drain 367 * (and unless we drive the external-charger-disable pin high it 368 * also tries to charge the battery causing even more feedback). 369 * 2) This gets seen by the pwrsrc block as a SDP USB Vbus supply 370 * Since the external battery charger has its own 5v boost converter 371 * which does not have these issues, we simply turn the separate 372 * external 5v boost converter off and leave it off entirely. 373 */ 374 cht_wc_extcon_set_5v_boost(ext, false); 375 376 /* Enable sw control */ 377 ret = cht_wc_extcon_sw_control(ext, true); 378 if (ret) 379 goto disable_sw_control; 380 381 /* Disable charging by external battery charger */ 382 cht_wc_extcon_enable_charging(ext, false); 383 384 /* Register extcon device */ 385 ret = devm_extcon_dev_register(ext->dev, ext->edev); 386 if (ret) { 387 dev_err(ext->dev, "Error registering extcon device: %d\n", ret); 388 goto disable_sw_control; 389 } 390 391 ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts); 392 if (ret) { 393 dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret); 394 goto disable_sw_control; 395 } 396 397 /* 398 * If no USB host or device connected, route D+ and D- to PMIC for 399 * initial charger detection 400 */ 401 id = cht_wc_extcon_get_id(ext, pwrsrc_sts); 402 if (id != INTEL_USB_ID_GND) 403 cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC); 404 405 /* Get initial state */ 406 cht_wc_extcon_pwrsrc_event(ext); 407 408 ret = devm_request_threaded_irq(ext->dev, irq, NULL, cht_wc_extcon_isr, 409 IRQF_ONESHOT, pdev->name, ext); 410 if (ret) { 411 dev_err(ext->dev, "Error requesting interrupt: %d\n", ret); 412 goto disable_sw_control; 413 } 414 415 /* Unmask irqs */ 416 ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ_MASK, mask); 417 if (ret) { 418 dev_err(ext->dev, "Error writing irq-mask: %d\n", ret); 419 goto disable_sw_control; 420 } 421 422 platform_set_drvdata(pdev, ext); 423 424 return 0; 425 426 disable_sw_control: 427 cht_wc_extcon_sw_control(ext, false); 428 return ret; 429 } 430 431 static int cht_wc_extcon_remove(struct platform_device *pdev) 432 { 433 struct cht_wc_extcon_data *ext = platform_get_drvdata(pdev); 434 435 cht_wc_extcon_sw_control(ext, false); 436 437 return 0; 438 } 439 440 static const struct platform_device_id cht_wc_extcon_table[] = { 441 { .name = "cht_wcove_pwrsrc" }, 442 {}, 443 }; 444 MODULE_DEVICE_TABLE(platform, cht_wc_extcon_table); 445 446 static struct platform_driver cht_wc_extcon_driver = { 447 .probe = cht_wc_extcon_probe, 448 .remove = cht_wc_extcon_remove, 449 .id_table = cht_wc_extcon_table, 450 .driver = { 451 .name = "cht_wcove_pwrsrc", 452 }, 453 }; 454 module_platform_driver(cht_wc_extcon_driver); 455 456 MODULE_DESCRIPTION("Intel Cherrytrail Whiskey Cove PMIC extcon driver"); 457 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 458 MODULE_LICENSE("GPL v2"); 459