1 /* 2 * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC 3 * 4 * Copyright (C) 2012 Samsung Electrnoics 5 * Donggeun Kim <dg77.kim@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/i2c.h> 21 #include <linux/slab.h> 22 #include <linux/interrupt.h> 23 #include <linux/err.h> 24 #include <linux/platform_device.h> 25 #include <linux/kobject.h> 26 #include <linux/mfd/max8997.h> 27 #include <linux/mfd/max8997-private.h> 28 #include <linux/extcon.h> 29 #include <linux/irqdomain.h> 30 31 #define DEV_NAME "max8997-muic" 32 33 /* MAX8997-MUIC STATUS1 register */ 34 #define STATUS1_ADC_SHIFT 0 35 #define STATUS1_ADCLOW_SHIFT 5 36 #define STATUS1_ADCERR_SHIFT 6 37 #define STATUS1_ADC_MASK (0x1f << STATUS1_ADC_SHIFT) 38 #define STATUS1_ADCLOW_MASK (0x1 << STATUS1_ADCLOW_SHIFT) 39 #define STATUS1_ADCERR_MASK (0x1 << STATUS1_ADCERR_SHIFT) 40 41 /* MAX8997-MUIC STATUS2 register */ 42 #define STATUS2_CHGTYP_SHIFT 0 43 #define STATUS2_CHGDETRUN_SHIFT 3 44 #define STATUS2_DCDTMR_SHIFT 4 45 #define STATUS2_DBCHG_SHIFT 5 46 #define STATUS2_VBVOLT_SHIFT 6 47 #define STATUS2_CHGTYP_MASK (0x7 << STATUS2_CHGTYP_SHIFT) 48 #define STATUS2_CHGDETRUN_MASK (0x1 << STATUS2_CHGDETRUN_SHIFT) 49 #define STATUS2_DCDTMR_MASK (0x1 << STATUS2_DCDTMR_SHIFT) 50 #define STATUS2_DBCHG_MASK (0x1 << STATUS2_DBCHG_SHIFT) 51 #define STATUS2_VBVOLT_MASK (0x1 << STATUS2_VBVOLT_SHIFT) 52 53 /* MAX8997-MUIC STATUS3 register */ 54 #define STATUS3_OVP_SHIFT 2 55 #define STATUS3_OVP_MASK (0x1 << STATUS3_OVP_SHIFT) 56 57 /* MAX8997-MUIC CONTROL1 register */ 58 #define COMN1SW_SHIFT 0 59 #define COMP2SW_SHIFT 3 60 #define COMN1SW_MASK (0x7 << COMN1SW_SHIFT) 61 #define COMP2SW_MASK (0x7 << COMP2SW_SHIFT) 62 #define SW_MASK (COMP2SW_MASK | COMN1SW_MASK) 63 64 #define MAX8997_SW_USB ((1 << COMP2SW_SHIFT) | (1 << COMN1SW_SHIFT)) 65 #define MAX8997_SW_AUDIO ((2 << COMP2SW_SHIFT) | (2 << COMN1SW_SHIFT)) 66 #define MAX8997_SW_UART ((3 << COMP2SW_SHIFT) | (3 << COMN1SW_SHIFT)) 67 #define MAX8997_SW_OPEN ((0 << COMP2SW_SHIFT) | (0 << COMN1SW_SHIFT)) 68 69 #define MAX8997_ADC_GROUND 0x00 70 #define MAX8997_ADC_MHL 0x01 71 #define MAX8997_ADC_JIG_USB_1 0x18 72 #define MAX8997_ADC_JIG_USB_2 0x19 73 #define MAX8997_ADC_DESKDOCK 0x1a 74 #define MAX8997_ADC_JIG_UART 0x1c 75 #define MAX8997_ADC_CARDOCK 0x1d 76 #define MAX8997_ADC_OPEN 0x1f 77 78 struct max8997_muic_irq { 79 unsigned int irq; 80 const char *name; 81 unsigned int virq; 82 }; 83 84 static struct max8997_muic_irq muic_irqs[] = { 85 { MAX8997_MUICIRQ_ADCError, "muic-ADC_error" }, 86 { MAX8997_MUICIRQ_ADCLow, "muic-ADC_low" }, 87 { MAX8997_MUICIRQ_ADC, "muic-ADC" }, 88 { MAX8997_MUICIRQ_VBVolt, "muic-VB_voltage" }, 89 { MAX8997_MUICIRQ_DBChg, "muic-DB_charger" }, 90 { MAX8997_MUICIRQ_DCDTmr, "muic-DCD_timer" }, 91 { MAX8997_MUICIRQ_ChgDetRun, "muic-CDR_status" }, 92 { MAX8997_MUICIRQ_ChgTyp, "muic-charger_type" }, 93 { MAX8997_MUICIRQ_OVP, "muic-over_voltage" }, 94 }; 95 96 struct max8997_muic_info { 97 struct device *dev; 98 struct i2c_client *muic; 99 struct max8997_muic_platform_data *muic_pdata; 100 101 int irq; 102 struct work_struct irq_work; 103 104 enum max8997_muic_charger_type pre_charger_type; 105 int pre_adc; 106 107 struct mutex mutex; 108 109 struct extcon_dev *edev; 110 }; 111 112 const char *max8997_extcon_cable[] = { 113 [0] = "USB", 114 [1] = "USB-Host", 115 [2] = "TA", 116 [3] = "Fast-charger", 117 [4] = "Slow-charger", 118 [5] = "Charge-downstream", 119 [6] = "MHL", 120 [7] = "Dock-desk", 121 [8] = "Dock-card", 122 [9] = "JIG", 123 124 NULL, 125 }; 126 127 static int max8997_muic_handle_usb(struct max8997_muic_info *info, 128 enum max8997_muic_usb_type usb_type, bool attached) 129 { 130 int ret = 0; 131 132 if (usb_type == MAX8997_USB_HOST) { 133 /* switch to USB */ 134 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1, 135 attached ? MAX8997_SW_USB : MAX8997_SW_OPEN, 136 SW_MASK); 137 if (ret) { 138 dev_err(info->dev, "failed to update muic register\n"); 139 goto out; 140 } 141 } 142 143 switch (usb_type) { 144 case MAX8997_USB_HOST: 145 extcon_set_cable_state(info->edev, "USB-Host", attached); 146 break; 147 case MAX8997_USB_DEVICE: 148 extcon_set_cable_state(info->edev, "USB", attached); 149 break; 150 default: 151 ret = -EINVAL; 152 break; 153 } 154 155 out: 156 return ret; 157 } 158 159 static int max8997_muic_handle_dock(struct max8997_muic_info *info, 160 int adc, bool attached) 161 { 162 int ret = 0; 163 164 /* switch to AUDIO */ 165 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1, 166 attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN, 167 SW_MASK); 168 if (ret) { 169 dev_err(info->dev, "failed to update muic register\n"); 170 goto out; 171 } 172 173 switch (adc) { 174 case MAX8997_ADC_DESKDOCK: 175 extcon_set_cable_state(info->edev, "Dock-desk", attached); 176 break; 177 case MAX8997_ADC_CARDOCK: 178 extcon_set_cable_state(info->edev, "Dock-card", attached); 179 break; 180 default: 181 ret = -EINVAL; 182 break; 183 } 184 out: 185 return ret; 186 } 187 188 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info, 189 bool attached) 190 { 191 int ret = 0; 192 193 /* switch to UART */ 194 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1, 195 attached ? MAX8997_SW_UART : MAX8997_SW_OPEN, 196 SW_MASK); 197 if (ret) { 198 dev_err(info->dev, "failed to update muic register\n"); 199 goto out; 200 } 201 202 extcon_set_cable_state(info->edev, "JIG", attached); 203 out: 204 return ret; 205 } 206 207 static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info) 208 { 209 int ret = 0; 210 211 switch (info->pre_adc) { 212 case MAX8997_ADC_GROUND: 213 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false); 214 break; 215 case MAX8997_ADC_MHL: 216 extcon_set_cable_state(info->edev, "MHL", false); 217 break; 218 case MAX8997_ADC_JIG_USB_1: 219 case MAX8997_ADC_JIG_USB_2: 220 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, false); 221 break; 222 case MAX8997_ADC_DESKDOCK: 223 case MAX8997_ADC_CARDOCK: 224 ret = max8997_muic_handle_dock(info, info->pre_adc, false); 225 break; 226 case MAX8997_ADC_JIG_UART: 227 ret = max8997_muic_handle_jig_uart(info, false); 228 break; 229 default: 230 break; 231 } 232 233 return ret; 234 } 235 236 static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc) 237 { 238 int ret = 0; 239 240 switch (adc) { 241 case MAX8997_ADC_GROUND: 242 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true); 243 break; 244 case MAX8997_ADC_MHL: 245 extcon_set_cable_state(info->edev, "MHL", true); 246 break; 247 case MAX8997_ADC_JIG_USB_1: 248 case MAX8997_ADC_JIG_USB_2: 249 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, true); 250 break; 251 case MAX8997_ADC_DESKDOCK: 252 case MAX8997_ADC_CARDOCK: 253 ret = max8997_muic_handle_dock(info, adc, true); 254 break; 255 case MAX8997_ADC_JIG_UART: 256 ret = max8997_muic_handle_jig_uart(info, true); 257 break; 258 case MAX8997_ADC_OPEN: 259 ret = max8997_muic_handle_adc_detach(info); 260 break; 261 default: 262 ret = -EINVAL; 263 goto out; 264 } 265 266 info->pre_adc = adc; 267 out: 268 return ret; 269 } 270 271 static int max8997_muic_handle_charger_type_detach( 272 struct max8997_muic_info *info) 273 { 274 int ret = 0; 275 276 switch (info->pre_charger_type) { 277 case MAX8997_CHARGER_TYPE_USB: 278 extcon_set_cable_state(info->edev, "USB", false); 279 break; 280 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT: 281 extcon_set_cable_state(info->edev, "Charge-downstream", false); 282 break; 283 case MAX8997_CHARGER_TYPE_DEDICATED_CHG: 284 extcon_set_cable_state(info->edev, "TA", false); 285 break; 286 case MAX8997_CHARGER_TYPE_500MA: 287 extcon_set_cable_state(info->edev, "Slow-charger", false); 288 break; 289 case MAX8997_CHARGER_TYPE_1A: 290 extcon_set_cable_state(info->edev, "Fast-charger", false); 291 break; 292 default: 293 ret = -EINVAL; 294 break; 295 } 296 297 return ret; 298 } 299 300 static int max8997_muic_handle_charger_type(struct max8997_muic_info *info, 301 enum max8997_muic_charger_type charger_type) 302 { 303 u8 adc; 304 int ret; 305 306 ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc); 307 if (ret) { 308 dev_err(info->dev, "failed to read muic register\n"); 309 goto out; 310 } 311 312 switch (charger_type) { 313 case MAX8997_CHARGER_TYPE_NONE: 314 ret = max8997_muic_handle_charger_type_detach(info); 315 break; 316 case MAX8997_CHARGER_TYPE_USB: 317 if ((adc & STATUS1_ADC_MASK) == MAX8997_ADC_OPEN) { 318 max8997_muic_handle_usb(info, 319 MAX8997_USB_DEVICE, true); 320 } 321 break; 322 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT: 323 extcon_set_cable_state(info->edev, "Charge-downstream", true); 324 break; 325 case MAX8997_CHARGER_TYPE_DEDICATED_CHG: 326 extcon_set_cable_state(info->edev, "TA", true); 327 break; 328 case MAX8997_CHARGER_TYPE_500MA: 329 extcon_set_cable_state(info->edev, "Slow-charger", true); 330 break; 331 case MAX8997_CHARGER_TYPE_1A: 332 extcon_set_cable_state(info->edev, "Fast-charger", true); 333 break; 334 default: 335 ret = -EINVAL; 336 goto out; 337 } 338 339 info->pre_charger_type = charger_type; 340 out: 341 return ret; 342 } 343 344 static void max8997_muic_irq_work(struct work_struct *work) 345 { 346 struct max8997_muic_info *info = container_of(work, 347 struct max8997_muic_info, irq_work); 348 u8 status[2]; 349 u8 adc, chg_type; 350 int irq_type = 0; 351 int i, ret; 352 353 mutex_lock(&info->mutex); 354 355 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, 356 2, status); 357 if (ret) { 358 dev_err(info->dev, "failed to read muic register\n"); 359 mutex_unlock(&info->mutex); 360 return; 361 } 362 363 dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__, 364 status[0], status[1]); 365 366 for (i = 0 ; i < ARRAY_SIZE(muic_irqs) ; i++) 367 if (info->irq == muic_irqs[i].virq) 368 irq_type = muic_irqs[i].irq; 369 370 switch (irq_type) { 371 case MAX8997_MUICIRQ_ADC: 372 adc = status[0] & STATUS1_ADC_MASK; 373 adc >>= STATUS1_ADC_SHIFT; 374 375 max8997_muic_handle_adc(info, adc); 376 break; 377 case MAX8997_MUICIRQ_ChgTyp: 378 chg_type = status[1] & STATUS2_CHGTYP_MASK; 379 chg_type >>= STATUS2_CHGTYP_SHIFT; 380 381 max8997_muic_handle_charger_type(info, chg_type); 382 break; 383 default: 384 dev_info(info->dev, "misc interrupt: irq %d occurred\n", 385 irq_type); 386 break; 387 } 388 389 mutex_unlock(&info->mutex); 390 391 return; 392 } 393 394 static irqreturn_t max8997_muic_irq_handler(int irq, void *data) 395 { 396 struct max8997_muic_info *info = data; 397 398 dev_dbg(info->dev, "irq:%d\n", irq); 399 info->irq = irq; 400 401 schedule_work(&info->irq_work); 402 403 return IRQ_HANDLED; 404 } 405 406 static void max8997_muic_detect_dev(struct max8997_muic_info *info) 407 { 408 int ret; 409 u8 status[2], adc, chg_type; 410 411 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, 412 2, status); 413 if (ret) { 414 dev_err(info->dev, "failed to read muic register\n"); 415 return; 416 } 417 418 dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n", 419 status[0], status[1]); 420 421 adc = status[0] & STATUS1_ADC_MASK; 422 adc >>= STATUS1_ADC_SHIFT; 423 424 chg_type = status[1] & STATUS2_CHGTYP_MASK; 425 chg_type >>= STATUS2_CHGTYP_SHIFT; 426 427 max8997_muic_handle_adc(info, adc); 428 max8997_muic_handle_charger_type(info, chg_type); 429 } 430 431 static int __devinit max8997_muic_probe(struct platform_device *pdev) 432 { 433 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent); 434 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev); 435 struct max8997_muic_info *info; 436 int ret, i; 437 438 info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL); 439 if (!info) { 440 dev_err(&pdev->dev, "failed to allocate memory\n"); 441 ret = -ENOMEM; 442 goto err_kfree; 443 } 444 445 info->dev = &pdev->dev; 446 info->muic = max8997->muic; 447 448 platform_set_drvdata(pdev, info); 449 mutex_init(&info->mutex); 450 451 INIT_WORK(&info->irq_work, max8997_muic_irq_work); 452 453 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { 454 struct max8997_muic_irq *muic_irq = &muic_irqs[i]; 455 int virq = 0; 456 457 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq); 458 if (!virq) 459 goto err_irq; 460 muic_irq->virq = virq; 461 462 ret = request_threaded_irq(virq, NULL,max8997_muic_irq_handler, 463 0, muic_irq->name, info); 464 if (ret) { 465 dev_err(&pdev->dev, 466 "failed: irq request (IRQ: %d," 467 " error :%d)\n", 468 muic_irq->irq, ret); 469 goto err_irq; 470 } 471 } 472 473 /* External connector */ 474 info->edev = kzalloc(sizeof(struct extcon_dev), GFP_KERNEL); 475 if (!info->edev) { 476 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 477 ret = -ENOMEM; 478 goto err_irq; 479 } 480 info->edev->name = DEV_NAME; 481 info->edev->supported_cable = max8997_extcon_cable; 482 ret = extcon_dev_register(info->edev, NULL); 483 if (ret) { 484 dev_err(&pdev->dev, "failed to register extcon device\n"); 485 goto err_extcon; 486 } 487 488 /* Initialize registers according to platform data */ 489 if (pdata->muic_pdata) { 490 struct max8997_muic_platform_data *mdata = info->muic_pdata; 491 492 for (i = 0; i < mdata->num_init_data; i++) { 493 max8997_write_reg(info->muic, mdata->init_data[i].addr, 494 mdata->init_data[i].data); 495 } 496 } 497 498 /* Initial device detection */ 499 max8997_muic_detect_dev(info); 500 501 return ret; 502 503 err_extcon: 504 kfree(info->edev); 505 err_irq: 506 while (--i >= 0) 507 free_irq(muic_irqs[i].virq, info); 508 kfree(info); 509 err_kfree: 510 return ret; 511 } 512 513 static int __devexit max8997_muic_remove(struct platform_device *pdev) 514 { 515 struct max8997_muic_info *info = platform_get_drvdata(pdev); 516 int i; 517 518 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) 519 free_irq(muic_irqs[i].virq, info); 520 cancel_work_sync(&info->irq_work); 521 522 extcon_dev_unregister(info->edev); 523 524 kfree(info->edev); 525 kfree(info); 526 527 return 0; 528 } 529 530 static struct platform_driver max8997_muic_driver = { 531 .driver = { 532 .name = DEV_NAME, 533 .owner = THIS_MODULE, 534 }, 535 .probe = max8997_muic_probe, 536 .remove = __devexit_p(max8997_muic_remove), 537 }; 538 539 module_platform_driver(max8997_muic_driver); 540 541 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver"); 542 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); 543 MODULE_LICENSE("GPL"); 544