Chanwoo Choi | 962e56b | 2013-11-22 16:51:06 +0100 | [diff] [blame] | 1 | /* |
| 2 | * extcon-max14577.c - MAX14577 extcon driver to support MAX14577 MUIC |
| 3 | * |
| 4 | * Copyright (C) 2013 Samsung Electrnoics |
| 5 | * Chanwoo Choi <cw00.choi@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/interrupt.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/mfd/max14577.h> |
| 24 | #include <linux/mfd/max14577-private.h> |
| 25 | #include <linux/extcon.h> |
| 26 | |
Chanwoo Choi | 962e56b | 2013-11-22 16:51:06 +0100 | [diff] [blame] | 27 | #define DELAY_MS_DEFAULT 17000 /* unit: millisecond */ |
| 28 | |
| 29 | enum max14577_muic_adc_debounce_time { |
| 30 | ADC_DEBOUNCE_TIME_5MS = 0, |
| 31 | ADC_DEBOUNCE_TIME_10MS, |
| 32 | ADC_DEBOUNCE_TIME_25MS, |
| 33 | ADC_DEBOUNCE_TIME_38_62MS, |
| 34 | }; |
| 35 | |
| 36 | enum max14577_muic_status { |
| 37 | MAX14577_MUIC_STATUS1 = 0, |
| 38 | MAX14577_MUIC_STATUS2 = 1, |
| 39 | MAX14577_MUIC_STATUS_END, |
| 40 | }; |
| 41 | |
| 42 | struct max14577_muic_info { |
| 43 | struct device *dev; |
| 44 | struct max14577 *max14577; |
| 45 | struct extcon_dev *edev; |
| 46 | int prev_cable_type; |
| 47 | int prev_chg_type; |
| 48 | u8 status[MAX14577_MUIC_STATUS_END]; |
| 49 | |
| 50 | bool irq_adc; |
| 51 | bool irq_chg; |
| 52 | struct work_struct irq_work; |
| 53 | struct mutex mutex; |
| 54 | |
| 55 | /* |
| 56 | * Use delayed workqueue to detect cable state and then |
| 57 | * notify cable state to notifiee/platform through uevent. |
| 58 | * After completing the booting of platform, the extcon provider |
| 59 | * driver should notify cable state to upper layer. |
| 60 | */ |
| 61 | struct delayed_work wq_detcable; |
| 62 | |
| 63 | /* |
| 64 | * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB |
| 65 | * h/w path of COMP2/COMN1 on CONTROL1 register. |
| 66 | */ |
| 67 | int path_usb; |
| 68 | int path_uart; |
| 69 | }; |
| 70 | |
| 71 | enum max14577_muic_cable_group { |
| 72 | MAX14577_CABLE_GROUP_ADC = 0, |
| 73 | MAX14577_CABLE_GROUP_CHG, |
| 74 | }; |
| 75 | |
| 76 | /** |
| 77 | * struct max14577_muic_irq |
| 78 | * @irq: the index of irq list of MUIC device. |
| 79 | * @name: the name of irq. |
| 80 | * @virq: the virtual irq to use irq domain |
| 81 | */ |
| 82 | struct max14577_muic_irq { |
| 83 | unsigned int irq; |
| 84 | const char *name; |
| 85 | unsigned int virq; |
| 86 | }; |
| 87 | |
| 88 | static struct max14577_muic_irq muic_irqs[] = { |
| 89 | { MAX14577_IRQ_INT1_ADC, "muic-ADC" }, |
| 90 | { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" }, |
| 91 | { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" }, |
| 92 | { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" }, |
| 93 | { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" }, |
| 94 | { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" }, |
| 95 | { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" }, |
| 96 | { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" }, |
| 97 | }; |
| 98 | |
| 99 | /* Define supported accessory type */ |
| 100 | enum max14577_muic_acc_type { |
| 101 | MAX14577_MUIC_ADC_GROUND = 0x0, |
| 102 | MAX14577_MUIC_ADC_SEND_END_BUTTON, |
| 103 | MAX14577_MUIC_ADC_REMOTE_S1_BUTTON, |
| 104 | MAX14577_MUIC_ADC_REMOTE_S2_BUTTON, |
| 105 | MAX14577_MUIC_ADC_REMOTE_S3_BUTTON, |
| 106 | MAX14577_MUIC_ADC_REMOTE_S4_BUTTON, |
| 107 | MAX14577_MUIC_ADC_REMOTE_S5_BUTTON, |
| 108 | MAX14577_MUIC_ADC_REMOTE_S6_BUTTON, |
| 109 | MAX14577_MUIC_ADC_REMOTE_S7_BUTTON, |
| 110 | MAX14577_MUIC_ADC_REMOTE_S8_BUTTON, |
| 111 | MAX14577_MUIC_ADC_REMOTE_S9_BUTTON, |
| 112 | MAX14577_MUIC_ADC_REMOTE_S10_BUTTON, |
| 113 | MAX14577_MUIC_ADC_REMOTE_S11_BUTTON, |
| 114 | MAX14577_MUIC_ADC_REMOTE_S12_BUTTON, |
| 115 | MAX14577_MUIC_ADC_RESERVED_ACC_1, |
| 116 | MAX14577_MUIC_ADC_RESERVED_ACC_2, |
| 117 | MAX14577_MUIC_ADC_RESERVED_ACC_3, |
| 118 | MAX14577_MUIC_ADC_RESERVED_ACC_4, |
| 119 | MAX14577_MUIC_ADC_RESERVED_ACC_5, |
| 120 | MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2, |
| 121 | MAX14577_MUIC_ADC_PHONE_POWERED_DEV, |
| 122 | MAX14577_MUIC_ADC_TTY_CONVERTER, |
| 123 | MAX14577_MUIC_ADC_UART_CABLE, |
| 124 | MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG, |
| 125 | MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF, |
| 126 | MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON, |
| 127 | MAX14577_MUIC_ADC_AV_CABLE_NOLOAD, |
| 128 | MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG, |
| 129 | MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF, |
| 130 | MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON, |
| 131 | MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */ |
| 132 | MAX14577_MUIC_ADC_OPEN, |
| 133 | }; |
| 134 | |
| 135 | /* max14577 MUIC device support below list of accessories(external connector) */ |
| 136 | enum { |
| 137 | EXTCON_CABLE_USB = 0, |
| 138 | EXTCON_CABLE_TA, |
| 139 | EXTCON_CABLE_FAST_CHARGER, |
| 140 | EXTCON_CABLE_SLOW_CHARGER, |
| 141 | EXTCON_CABLE_CHARGE_DOWNSTREAM, |
| 142 | EXTCON_CABLE_JIG_USB_ON, |
| 143 | EXTCON_CABLE_JIG_USB_OFF, |
| 144 | EXTCON_CABLE_JIG_UART_OFF, |
| 145 | EXTCON_CABLE_JIG_UART_ON, |
| 146 | |
| 147 | _EXTCON_CABLE_NUM, |
| 148 | }; |
| 149 | |
| 150 | static const char *max14577_extcon_cable[] = { |
| 151 | [EXTCON_CABLE_USB] = "USB", |
| 152 | [EXTCON_CABLE_TA] = "TA", |
| 153 | [EXTCON_CABLE_FAST_CHARGER] = "Fast-charger", |
| 154 | [EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger", |
| 155 | [EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream", |
| 156 | [EXTCON_CABLE_JIG_USB_ON] = "JIG-USB-ON", |
| 157 | [EXTCON_CABLE_JIG_USB_OFF] = "JIG-USB-OFF", |
| 158 | [EXTCON_CABLE_JIG_UART_OFF] = "JIG-UART-OFF", |
| 159 | [EXTCON_CABLE_JIG_UART_ON] = "JIG-UART-ON", |
| 160 | |
| 161 | NULL, |
| 162 | }; |
| 163 | |
| 164 | /* |
| 165 | * max14577_muic_set_debounce_time - Set the debounce time of ADC |
| 166 | * @info: the instance including private data of max14577 MUIC |
| 167 | * @time: the debounce time of ADC |
| 168 | */ |
| 169 | static int max14577_muic_set_debounce_time(struct max14577_muic_info *info, |
| 170 | enum max14577_muic_adc_debounce_time time) |
| 171 | { |
| 172 | u8 ret; |
| 173 | |
| 174 | switch (time) { |
| 175 | case ADC_DEBOUNCE_TIME_5MS: |
| 176 | case ADC_DEBOUNCE_TIME_10MS: |
| 177 | case ADC_DEBOUNCE_TIME_25MS: |
| 178 | case ADC_DEBOUNCE_TIME_38_62MS: |
| 179 | ret = max14577_update_reg(info->max14577->regmap, |
| 180 | MAX14577_MUIC_REG_CONTROL3, |
| 181 | CTRL3_ADCDBSET_MASK, |
| 182 | time << CTRL3_ADCDBSET_SHIFT); |
| 183 | if (ret) { |
| 184 | dev_err(info->dev, "failed to set ADC debounce time\n"); |
| 185 | return ret; |
| 186 | } |
| 187 | break; |
| 188 | default: |
| 189 | dev_err(info->dev, "invalid ADC debounce time\n"); |
| 190 | return -EINVAL; |
| 191 | } |
| 192 | |
| 193 | return 0; |
| 194 | }; |
| 195 | |
| 196 | /* |
| 197 | * max14577_muic_set_path - Set hardware line according to attached cable |
| 198 | * @info: the instance including private data of max14577 MUIC |
| 199 | * @value: the path according to attached cable |
| 200 | * @attached: the state of cable (true:attached, false:detached) |
| 201 | * |
| 202 | * The max14577 MUIC device share outside H/W line among a varity of cables |
| 203 | * so, this function set internal path of H/W line according to the type of |
| 204 | * attached cable. |
| 205 | */ |
| 206 | static int max14577_muic_set_path(struct max14577_muic_info *info, |
| 207 | u8 val, bool attached) |
| 208 | { |
| 209 | int ret = 0; |
| 210 | u8 ctrl1, ctrl2 = 0; |
| 211 | |
| 212 | /* Set open state to path before changing hw path */ |
| 213 | ret = max14577_update_reg(info->max14577->regmap, |
| 214 | MAX14577_MUIC_REG_CONTROL1, |
| 215 | CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN); |
| 216 | if (ret < 0) { |
| 217 | dev_err(info->dev, "failed to update MUIC register\n"); |
| 218 | return ret; |
| 219 | } |
| 220 | |
| 221 | if (attached) |
| 222 | ctrl1 = val; |
| 223 | else |
| 224 | ctrl1 = CTRL1_SW_OPEN; |
| 225 | |
| 226 | ret = max14577_update_reg(info->max14577->regmap, |
| 227 | MAX14577_MUIC_REG_CONTROL1, |
| 228 | CLEAR_IDBEN_MICEN_MASK, ctrl1); |
| 229 | if (ret < 0) { |
| 230 | dev_err(info->dev, "failed to update MUIC register\n"); |
| 231 | return ret; |
| 232 | } |
| 233 | |
| 234 | if (attached) |
| 235 | ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ |
| 236 | else |
| 237 | ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ |
| 238 | |
| 239 | ret = max14577_update_reg(info->max14577->regmap, |
| 240 | MAX14577_REG_CONTROL2, |
| 241 | CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2); |
| 242 | if (ret < 0) { |
| 243 | dev_err(info->dev, "failed to update MUIC register\n"); |
| 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | dev_dbg(info->dev, |
| 248 | "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", |
| 249 | ctrl1, ctrl2, attached ? "attached" : "detached"); |
| 250 | |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * max14577_muic_get_cable_type - Return cable type and check cable state |
| 256 | * @info: the instance including private data of max14577 MUIC |
| 257 | * @group: the path according to attached cable |
| 258 | * @attached: store cable state and return |
| 259 | * |
| 260 | * This function check the cable state either attached or detached, |
| 261 | * and then divide precise type of cable according to cable group. |
| 262 | * - max14577_CABLE_GROUP_ADC |
| 263 | * - max14577_CABLE_GROUP_CHG |
| 264 | */ |
| 265 | static int max14577_muic_get_cable_type(struct max14577_muic_info *info, |
| 266 | enum max14577_muic_cable_group group, bool *attached) |
| 267 | { |
| 268 | int cable_type = 0; |
| 269 | int adc; |
| 270 | int chg_type; |
| 271 | |
| 272 | switch (group) { |
| 273 | case MAX14577_CABLE_GROUP_ADC: |
| 274 | /* |
| 275 | * Read ADC value to check cable type and decide cable state |
| 276 | * according to cable type |
| 277 | */ |
| 278 | adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK; |
| 279 | adc >>= STATUS1_ADC_SHIFT; |
| 280 | |
| 281 | /* |
| 282 | * Check current cable state/cable type and store cable type |
| 283 | * (info->prev_cable_type) for handling cable when cable is |
| 284 | * detached. |
| 285 | */ |
| 286 | if (adc == MAX14577_MUIC_ADC_OPEN) { |
| 287 | *attached = false; |
| 288 | |
| 289 | cable_type = info->prev_cable_type; |
| 290 | info->prev_cable_type = MAX14577_MUIC_ADC_OPEN; |
| 291 | } else { |
| 292 | *attached = true; |
| 293 | |
| 294 | cable_type = info->prev_cable_type = adc; |
| 295 | } |
| 296 | break; |
| 297 | case MAX14577_CABLE_GROUP_CHG: |
| 298 | /* |
| 299 | * Read charger type to check cable type and decide cable state |
| 300 | * according to type of charger cable. |
| 301 | */ |
| 302 | chg_type = info->status[MAX14577_MUIC_STATUS2] & |
| 303 | STATUS2_CHGTYP_MASK; |
| 304 | chg_type >>= STATUS2_CHGTYP_SHIFT; |
| 305 | |
| 306 | if (chg_type == MAX14577_CHARGER_TYPE_NONE) { |
| 307 | *attached = false; |
| 308 | |
| 309 | cable_type = info->prev_chg_type; |
| 310 | info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE; |
| 311 | } else { |
| 312 | *attached = true; |
| 313 | |
| 314 | /* |
| 315 | * Check current cable state/cable type and store cable |
| 316 | * type(info->prev_chg_type) for handling cable when |
| 317 | * charger cable is detached. |
| 318 | */ |
| 319 | cable_type = info->prev_chg_type = chg_type; |
| 320 | } |
| 321 | |
| 322 | break; |
| 323 | default: |
| 324 | dev_err(info->dev, "Unknown cable group (%d)\n", group); |
| 325 | cable_type = -EINVAL; |
| 326 | break; |
| 327 | } |
| 328 | |
| 329 | return cable_type; |
| 330 | } |
| 331 | |
| 332 | static int max14577_muic_jig_handler(struct max14577_muic_info *info, |
| 333 | int cable_type, bool attached) |
| 334 | { |
| 335 | char cable_name[32]; |
| 336 | int ret = 0; |
| 337 | u8 path = CTRL1_SW_OPEN; |
| 338 | |
| 339 | dev_dbg(info->dev, |
| 340 | "external connector is %s (adc:0x%02x)\n", |
| 341 | attached ? "attached" : "detached", cable_type); |
| 342 | |
| 343 | switch (cable_type) { |
| 344 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */ |
| 345 | /* PATH:AP_USB */ |
| 346 | strcpy(cable_name, "JIG-USB-OFF"); |
| 347 | path = CTRL1_SW_USB; |
| 348 | break; |
| 349 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */ |
| 350 | /* PATH:AP_USB */ |
| 351 | strcpy(cable_name, "JIG-USB-ON"); |
| 352 | path = CTRL1_SW_USB; |
| 353 | break; |
| 354 | case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */ |
| 355 | /* PATH:AP_UART */ |
| 356 | strcpy(cable_name, "JIG-UART-OFF"); |
| 357 | path = CTRL1_SW_UART; |
| 358 | break; |
| 359 | default: |
| 360 | dev_err(info->dev, "failed to detect %s jig cable\n", |
| 361 | attached ? "attached" : "detached"); |
| 362 | return -EINVAL; |
| 363 | } |
| 364 | |
| 365 | ret = max14577_muic_set_path(info, path, attached); |
| 366 | if (ret < 0) |
| 367 | return ret; |
| 368 | |
| 369 | extcon_set_cable_state(info->edev, cable_name, attached); |
| 370 | |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | static int max14577_muic_adc_handler(struct max14577_muic_info *info) |
| 375 | { |
| 376 | int cable_type; |
| 377 | bool attached; |
| 378 | int ret = 0; |
| 379 | |
| 380 | /* Check accessory state which is either detached or attached */ |
| 381 | cable_type = max14577_muic_get_cable_type(info, |
| 382 | MAX14577_CABLE_GROUP_ADC, &attached); |
| 383 | |
| 384 | dev_dbg(info->dev, |
| 385 | "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n", |
| 386 | attached ? "attached" : "detached", cable_type, |
| 387 | info->prev_cable_type); |
| 388 | |
| 389 | switch (cable_type) { |
| 390 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: |
| 391 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: |
| 392 | case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: |
| 393 | /* JIG */ |
| 394 | ret = max14577_muic_jig_handler(info, cable_type, attached); |
| 395 | if (ret < 0) |
| 396 | return ret; |
| 397 | break; |
| 398 | case MAX14577_MUIC_ADC_GROUND: |
| 399 | case MAX14577_MUIC_ADC_SEND_END_BUTTON: |
| 400 | case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON: |
| 401 | case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON: |
| 402 | case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON: |
| 403 | case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON: |
| 404 | case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON: |
| 405 | case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON: |
| 406 | case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON: |
| 407 | case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON: |
| 408 | case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON: |
| 409 | case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON: |
| 410 | case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON: |
| 411 | case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON: |
| 412 | case MAX14577_MUIC_ADC_RESERVED_ACC_1: |
| 413 | case MAX14577_MUIC_ADC_RESERVED_ACC_2: |
| 414 | case MAX14577_MUIC_ADC_RESERVED_ACC_3: |
| 415 | case MAX14577_MUIC_ADC_RESERVED_ACC_4: |
| 416 | case MAX14577_MUIC_ADC_RESERVED_ACC_5: |
| 417 | case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2: |
| 418 | case MAX14577_MUIC_ADC_PHONE_POWERED_DEV: |
| 419 | case MAX14577_MUIC_ADC_TTY_CONVERTER: |
| 420 | case MAX14577_MUIC_ADC_UART_CABLE: |
| 421 | case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG: |
| 422 | case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD: |
| 423 | case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG: |
| 424 | case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON: |
| 425 | case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1: |
| 426 | /* |
| 427 | * This accessory isn't used in general case if it is specially |
| 428 | * needed to detect additional accessory, should implement |
| 429 | * proper operation when this accessory is attached/detached. |
| 430 | */ |
| 431 | dev_info(info->dev, |
| 432 | "accessory is %s but it isn't used (adc:0x%x)\n", |
| 433 | attached ? "attached" : "detached", cable_type); |
| 434 | return -EAGAIN; |
| 435 | default: |
| 436 | dev_err(info->dev, |
| 437 | "failed to detect %s accessory (adc:0x%x)\n", |
| 438 | attached ? "attached" : "detached", cable_type); |
| 439 | return -EINVAL; |
| 440 | } |
| 441 | |
| 442 | return 0; |
| 443 | } |
| 444 | |
| 445 | static int max14577_muic_chg_handler(struct max14577_muic_info *info) |
| 446 | { |
| 447 | int chg_type; |
| 448 | bool attached; |
| 449 | int ret = 0; |
| 450 | |
| 451 | chg_type = max14577_muic_get_cable_type(info, |
| 452 | MAX14577_CABLE_GROUP_CHG, &attached); |
| 453 | |
| 454 | dev_dbg(info->dev, |
| 455 | "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n", |
| 456 | attached ? "attached" : "detached", |
| 457 | chg_type, info->prev_chg_type); |
| 458 | |
| 459 | switch (chg_type) { |
| 460 | case MAX14577_CHARGER_TYPE_USB: |
| 461 | /* PATH:AP_USB */ |
| 462 | ret = max14577_muic_set_path(info, info->path_usb, attached); |
| 463 | if (ret < 0) |
| 464 | return ret; |
| 465 | |
| 466 | extcon_set_cable_state(info->edev, "USB", attached); |
| 467 | break; |
| 468 | case MAX14577_CHARGER_TYPE_DEDICATED_CHG: |
| 469 | extcon_set_cable_state(info->edev, "TA", attached); |
| 470 | break; |
| 471 | case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: |
| 472 | extcon_set_cable_state(info->edev, |
| 473 | "Charge-downstream", attached); |
| 474 | break; |
| 475 | case MAX14577_CHARGER_TYPE_SPECIAL_500MA: |
| 476 | extcon_set_cable_state(info->edev, "Slow-charger", attached); |
| 477 | break; |
| 478 | case MAX14577_CHARGER_TYPE_SPECIAL_1A: |
| 479 | extcon_set_cable_state(info->edev, "Fast-charger", attached); |
| 480 | break; |
| 481 | case MAX14577_CHARGER_TYPE_NONE: |
| 482 | case MAX14577_CHARGER_TYPE_DEAD_BATTERY: |
| 483 | break; |
| 484 | default: |
| 485 | dev_err(info->dev, |
| 486 | "failed to detect %s accessory (chg_type:0x%x)\n", |
| 487 | attached ? "attached" : "detached", chg_type); |
| 488 | return -EINVAL; |
| 489 | } |
| 490 | |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | static void max14577_muic_irq_work(struct work_struct *work) |
| 495 | { |
| 496 | struct max14577_muic_info *info = container_of(work, |
| 497 | struct max14577_muic_info, irq_work); |
| 498 | int ret = 0; |
| 499 | |
| 500 | if (!info->edev) |
| 501 | return; |
| 502 | |
| 503 | mutex_lock(&info->mutex); |
| 504 | |
| 505 | ret = max14577_bulk_read(info->max14577->regmap, |
| 506 | MAX14577_MUIC_REG_STATUS1, info->status, 2); |
| 507 | if (ret) { |
| 508 | dev_err(info->dev, "failed to read MUIC register\n"); |
| 509 | mutex_unlock(&info->mutex); |
| 510 | return; |
| 511 | } |
| 512 | |
| 513 | if (info->irq_adc) { |
| 514 | ret = max14577_muic_adc_handler(info); |
| 515 | info->irq_adc = false; |
| 516 | } |
| 517 | if (info->irq_chg) { |
| 518 | ret = max14577_muic_chg_handler(info); |
| 519 | info->irq_chg = false; |
| 520 | } |
| 521 | |
| 522 | if (ret < 0) |
| 523 | dev_err(info->dev, "failed to handle MUIC interrupt\n"); |
| 524 | |
| 525 | mutex_unlock(&info->mutex); |
| 526 | |
| 527 | return; |
| 528 | } |
| 529 | |
| 530 | static irqreturn_t max14577_muic_irq_handler(int irq, void *data) |
| 531 | { |
| 532 | struct max14577_muic_info *info = data; |
| 533 | int i, irq_type = -1; |
| 534 | |
| 535 | /* |
| 536 | * We may be called multiple times for different nested IRQ-s. |
| 537 | * Including changes in INT1_ADC and INT2_CGHTYP at once. |
| 538 | * However we only need to know whether it was ADC, charger |
| 539 | * or both interrupts so decode IRQ and turn on proper flags. |
| 540 | */ |
| 541 | for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) |
| 542 | if (irq == muic_irqs[i].virq) |
| 543 | irq_type = muic_irqs[i].irq; |
| 544 | |
| 545 | switch (irq_type) { |
| 546 | case MAX14577_IRQ_INT1_ADC: |
| 547 | case MAX14577_IRQ_INT1_ADCLOW: |
| 548 | case MAX14577_IRQ_INT1_ADCERR: |
| 549 | /* Handle all of accessory except for |
| 550 | type of charger accessory */ |
| 551 | info->irq_adc = true; |
| 552 | break; |
| 553 | case MAX14577_IRQ_INT2_CHGTYP: |
| 554 | case MAX14577_IRQ_INT2_CHGDETRUN: |
| 555 | case MAX14577_IRQ_INT2_DCDTMR: |
| 556 | case MAX14577_IRQ_INT2_DBCHG: |
| 557 | case MAX14577_IRQ_INT2_VBVOLT: |
| 558 | /* Handle charger accessory */ |
| 559 | info->irq_chg = true; |
| 560 | break; |
| 561 | default: |
| 562 | dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n", |
| 563 | irq_type); |
| 564 | return IRQ_HANDLED; |
| 565 | } |
| 566 | schedule_work(&info->irq_work); |
| 567 | |
| 568 | return IRQ_HANDLED; |
| 569 | } |
| 570 | |
| 571 | static int max14577_muic_detect_accessory(struct max14577_muic_info *info) |
| 572 | { |
| 573 | int ret = 0; |
| 574 | int adc; |
| 575 | int chg_type; |
| 576 | bool attached; |
| 577 | |
| 578 | mutex_lock(&info->mutex); |
| 579 | |
| 580 | /* Read STATUSx register to detect accessory */ |
| 581 | ret = max14577_bulk_read(info->max14577->regmap, |
| 582 | MAX14577_MUIC_REG_STATUS1, info->status, 2); |
| 583 | if (ret) { |
| 584 | dev_err(info->dev, "failed to read MUIC register\n"); |
| 585 | mutex_unlock(&info->mutex); |
| 586 | return ret; |
| 587 | } |
| 588 | |
| 589 | adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC, |
| 590 | &attached); |
| 591 | if (attached && adc != MAX14577_MUIC_ADC_OPEN) { |
| 592 | ret = max14577_muic_adc_handler(info); |
| 593 | if (ret < 0) { |
| 594 | dev_err(info->dev, "Cannot detect accessory\n"); |
| 595 | mutex_unlock(&info->mutex); |
| 596 | return ret; |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG, |
| 601 | &attached); |
| 602 | if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) { |
| 603 | ret = max14577_muic_chg_handler(info); |
| 604 | if (ret < 0) { |
| 605 | dev_err(info->dev, "Cannot detect charger accessory\n"); |
| 606 | mutex_unlock(&info->mutex); |
| 607 | return ret; |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | mutex_unlock(&info->mutex); |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static void max14577_muic_detect_cable_wq(struct work_struct *work) |
| 617 | { |
| 618 | struct max14577_muic_info *info = container_of(to_delayed_work(work), |
| 619 | struct max14577_muic_info, wq_detcable); |
| 620 | |
| 621 | max14577_muic_detect_accessory(info); |
| 622 | } |
| 623 | |
| 624 | static int max14577_muic_probe(struct platform_device *pdev) |
| 625 | { |
| 626 | struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); |
| 627 | struct max14577_muic_info *info; |
| 628 | int delay_jiffies; |
| 629 | int ret; |
| 630 | int i; |
| 631 | u8 id; |
| 632 | |
| 633 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
| 634 | if (!info) { |
| 635 | dev_err(&pdev->dev, "failed to allocate memory\n"); |
| 636 | return -ENOMEM; |
| 637 | } |
| 638 | info->dev = &pdev->dev; |
| 639 | info->max14577 = max14577; |
| 640 | |
| 641 | platform_set_drvdata(pdev, info); |
| 642 | mutex_init(&info->mutex); |
| 643 | |
| 644 | INIT_WORK(&info->irq_work, max14577_muic_irq_work); |
| 645 | |
| 646 | /* Support irq domain for max14577 MUIC device */ |
| 647 | for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { |
| 648 | struct max14577_muic_irq *muic_irq = &muic_irqs[i]; |
| 649 | unsigned int virq = 0; |
| 650 | |
| 651 | virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq); |
| 652 | if (!virq) |
| 653 | return -EINVAL; |
| 654 | muic_irq->virq = virq; |
| 655 | |
| 656 | ret = devm_request_threaded_irq(&pdev->dev, virq, NULL, |
| 657 | max14577_muic_irq_handler, |
| 658 | IRQF_NO_SUSPEND, |
| 659 | muic_irq->name, info); |
| 660 | if (ret) { |
| 661 | dev_err(&pdev->dev, |
| 662 | "failed: irq request (IRQ: %d," |
| 663 | " error :%d)\n", |
| 664 | muic_irq->irq, ret); |
| 665 | return ret; |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | /* Initialize extcon device */ |
| 670 | info->edev = devm_kzalloc(&pdev->dev, sizeof(*info->edev), GFP_KERNEL); |
| 671 | if (!info->edev) { |
| 672 | dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); |
| 673 | return -ENOMEM; |
| 674 | } |
Chanwoo Choi | 4005da5 | 2014-04-14 11:17:12 +0200 | [diff] [blame^] | 675 | |
| 676 | info->edev->name = dev_name(&pdev->dev); |
Chanwoo Choi | 962e56b | 2013-11-22 16:51:06 +0100 | [diff] [blame] | 677 | info->edev->supported_cable = max14577_extcon_cable; |
| 678 | ret = extcon_dev_register(info->edev); |
| 679 | if (ret) { |
| 680 | dev_err(&pdev->dev, "failed to register extcon device\n"); |
| 681 | return ret; |
| 682 | } |
| 683 | |
| 684 | /* Default h/w line path */ |
| 685 | info->path_usb = CTRL1_SW_USB; |
| 686 | info->path_uart = CTRL1_SW_UART; |
| 687 | delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); |
| 688 | |
| 689 | /* Set initial path for UART */ |
| 690 | max14577_muic_set_path(info, info->path_uart, true); |
| 691 | |
| 692 | /* Check revision number of MUIC device*/ |
| 693 | ret = max14577_read_reg(info->max14577->regmap, |
| 694 | MAX14577_REG_DEVICEID, &id); |
| 695 | if (ret < 0) { |
| 696 | dev_err(&pdev->dev, "failed to read revision number\n"); |
| 697 | goto err_extcon; |
| 698 | } |
| 699 | dev_info(info->dev, "device ID : 0x%x\n", id); |
| 700 | |
| 701 | /* Set ADC debounce time */ |
| 702 | max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); |
| 703 | |
| 704 | /* |
| 705 | * Detect accessory after completing the initialization of platform |
| 706 | * |
| 707 | * - Use delayed workqueue to detect cable state and then |
| 708 | * notify cable state to notifiee/platform through uevent. |
| 709 | * After completing the booting of platform, the extcon provider |
| 710 | * driver should notify cable state to upper layer. |
| 711 | */ |
| 712 | INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq); |
| 713 | ret = queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, |
| 714 | delay_jiffies); |
| 715 | if (ret < 0) { |
| 716 | dev_err(&pdev->dev, |
| 717 | "failed to schedule delayed work for cable detect\n"); |
| 718 | goto err_extcon; |
| 719 | } |
| 720 | |
| 721 | return ret; |
| 722 | |
| 723 | err_extcon: |
| 724 | extcon_dev_unregister(info->edev); |
| 725 | return ret; |
| 726 | } |
| 727 | |
| 728 | static int max14577_muic_remove(struct platform_device *pdev) |
| 729 | { |
| 730 | struct max14577_muic_info *info = platform_get_drvdata(pdev); |
| 731 | |
| 732 | cancel_work_sync(&info->irq_work); |
| 733 | extcon_dev_unregister(info->edev); |
| 734 | |
| 735 | return 0; |
| 736 | } |
| 737 | |
| 738 | static struct platform_driver max14577_muic_driver = { |
| 739 | .driver = { |
Chanwoo Choi | 4005da5 | 2014-04-14 11:17:12 +0200 | [diff] [blame^] | 740 | .name = "max14577-muic", |
Chanwoo Choi | 962e56b | 2013-11-22 16:51:06 +0100 | [diff] [blame] | 741 | .owner = THIS_MODULE, |
| 742 | }, |
| 743 | .probe = max14577_muic_probe, |
| 744 | .remove = max14577_muic_remove, |
| 745 | }; |
| 746 | |
| 747 | module_platform_driver(max14577_muic_driver); |
| 748 | |
| 749 | MODULE_DESCRIPTION("MAXIM 14577 Extcon driver"); |
| 750 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
| 751 | MODULE_LICENSE("GPL"); |
| 752 | MODULE_ALIAS("platform:extcon-max14577"); |