1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * extcon-fsa9480.c - Fairchild Semiconductor FSA9480 extcon driver 4 * 5 * Copyright (c) 2019 Tomasz Figa <tomasz.figa@gmail.com> 6 * 7 * Loosely based on old fsa9480 misc-device driver. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/i2c.h> 14 #include <linux/slab.h> 15 #include <linux/bitops.h> 16 #include <linux/interrupt.h> 17 #include <linux/err.h> 18 #include <linux/platform_device.h> 19 #include <linux/kobject.h> 20 #include <linux/extcon-provider.h> 21 #include <linux/irqdomain.h> 22 #include <linux/regmap.h> 23 24 /* FSA9480 I2C registers */ 25 #define FSA9480_REG_DEVID 0x01 26 #define FSA9480_REG_CTRL 0x02 27 #define FSA9480_REG_INT1 0x03 28 #define FSA9480_REG_INT2 0x04 29 #define FSA9480_REG_INT1_MASK 0x05 30 #define FSA9480_REG_INT2_MASK 0x06 31 #define FSA9480_REG_ADC 0x07 32 #define FSA9480_REG_TIMING1 0x08 33 #define FSA9480_REG_TIMING2 0x09 34 #define FSA9480_REG_DEV_T1 0x0a 35 #define FSA9480_REG_DEV_T2 0x0b 36 #define FSA9480_REG_BTN1 0x0c 37 #define FSA9480_REG_BTN2 0x0d 38 #define FSA9480_REG_CK 0x0e 39 #define FSA9480_REG_CK_INT1 0x0f 40 #define FSA9480_REG_CK_INT2 0x10 41 #define FSA9480_REG_CK_INTMASK1 0x11 42 #define FSA9480_REG_CK_INTMASK2 0x12 43 #define FSA9480_REG_MANSW1 0x13 44 #define FSA9480_REG_MANSW2 0x14 45 #define FSA9480_REG_END 0x15 46 47 /* Control */ 48 #define CON_SWITCH_OPEN (1 << 4) 49 #define CON_RAW_DATA (1 << 3) 50 #define CON_MANUAL_SW (1 << 2) 51 #define CON_WAIT (1 << 1) 52 #define CON_INT_MASK (1 << 0) 53 #define CON_MASK (CON_SWITCH_OPEN | CON_RAW_DATA | \ 54 CON_MANUAL_SW | CON_WAIT) 55 56 /* Device Type 1 */ 57 #define DEV_USB_OTG 7 58 #define DEV_DEDICATED_CHG 6 59 #define DEV_USB_CHG 5 60 #define DEV_CAR_KIT 4 61 #define DEV_UART 3 62 #define DEV_USB 2 63 #define DEV_AUDIO_2 1 64 #define DEV_AUDIO_1 0 65 66 #define DEV_T1_USB_MASK (DEV_USB_OTG | DEV_USB) 67 #define DEV_T1_UART_MASK (DEV_UART) 68 #define DEV_T1_CHARGER_MASK (DEV_DEDICATED_CHG | DEV_USB_CHG) 69 70 /* Device Type 2 */ 71 #define DEV_AV 14 72 #define DEV_TTY 13 73 #define DEV_PPD 12 74 #define DEV_JIG_UART_OFF 11 75 #define DEV_JIG_UART_ON 10 76 #define DEV_JIG_USB_OFF 9 77 #define DEV_JIG_USB_ON 8 78 79 #define DEV_T2_USB_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON) 80 #define DEV_T2_UART_MASK (DEV_JIG_UART_OFF | DEV_JIG_UART_ON) 81 #define DEV_T2_JIG_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON | \ 82 DEV_JIG_UART_OFF | DEV_JIG_UART_ON) 83 84 /* 85 * Manual Switch 86 * D- [7:5] / D+ [4:2] 87 * 000: Open all / 001: USB / 010: AUDIO / 011: UART / 100: V_AUDIO 88 */ 89 #define SW_VAUDIO ((4 << 5) | (4 << 2)) 90 #define SW_UART ((3 << 5) | (3 << 2)) 91 #define SW_AUDIO ((2 << 5) | (2 << 2)) 92 #define SW_DHOST ((1 << 5) | (1 << 2)) 93 #define SW_AUTO ((0 << 5) | (0 << 2)) 94 95 /* Interrupt 1 */ 96 #define INT1_MASK (0xff << 0) 97 #define INT_DETACH (1 << 1) 98 #define INT_ATTACH (1 << 0) 99 100 /* Interrupt 2 mask */ 101 #define INT2_MASK (0x1f << 0) 102 103 /* Timing Set 1 */ 104 #define TIMING1_ADC_500MS (0x6 << 0) 105 106 struct fsa9480_usbsw { 107 struct device *dev; 108 struct regmap *regmap; 109 struct extcon_dev *edev; 110 u16 cable; 111 }; 112 113 static const unsigned int fsa9480_extcon_cable[] = { 114 EXTCON_USB_HOST, 115 EXTCON_USB, 116 EXTCON_CHG_USB_DCP, 117 EXTCON_CHG_USB_SDP, 118 EXTCON_CHG_USB_ACA, 119 EXTCON_JACK_LINE_OUT, 120 EXTCON_JACK_VIDEO_OUT, 121 EXTCON_JIG, 122 123 EXTCON_NONE, 124 }; 125 126 static const u64 cable_types[] = { 127 [DEV_USB_OTG] = BIT_ULL(EXTCON_USB_HOST), 128 [DEV_DEDICATED_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_DCP), 129 [DEV_USB_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP), 130 [DEV_CAR_KIT] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP) 131 | BIT_ULL(EXTCON_JACK_LINE_OUT), 132 [DEV_UART] = BIT_ULL(EXTCON_JIG), 133 [DEV_USB] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP), 134 [DEV_AUDIO_2] = BIT_ULL(EXTCON_JACK_LINE_OUT), 135 [DEV_AUDIO_1] = BIT_ULL(EXTCON_JACK_LINE_OUT), 136 [DEV_AV] = BIT_ULL(EXTCON_JACK_LINE_OUT) 137 | BIT_ULL(EXTCON_JACK_VIDEO_OUT), 138 [DEV_TTY] = BIT_ULL(EXTCON_JIG), 139 [DEV_PPD] = BIT_ULL(EXTCON_JACK_LINE_OUT) | BIT_ULL(EXTCON_CHG_USB_ACA), 140 [DEV_JIG_UART_OFF] = BIT_ULL(EXTCON_JIG), 141 [DEV_JIG_UART_ON] = BIT_ULL(EXTCON_JIG), 142 [DEV_JIG_USB_OFF] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG), 143 [DEV_JIG_USB_ON] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG), 144 }; 145 146 /* Define regmap configuration of FSA9480 for I2C communication */ 147 static bool fsa9480_volatile_reg(struct device *dev, unsigned int reg) 148 { 149 switch (reg) { 150 case FSA9480_REG_INT1_MASK: 151 return true; 152 default: 153 break; 154 } 155 return false; 156 } 157 158 static const struct regmap_config fsa9480_regmap_config = { 159 .reg_bits = 8, 160 .val_bits = 8, 161 .volatile_reg = fsa9480_volatile_reg, 162 .max_register = FSA9480_REG_END, 163 }; 164 165 static int fsa9480_write_reg(struct fsa9480_usbsw *usbsw, int reg, int value) 166 { 167 int ret; 168 169 ret = regmap_write(usbsw->regmap, reg, value); 170 if (ret < 0) 171 dev_err(usbsw->dev, "%s: err %d\n", __func__, ret); 172 173 return ret; 174 } 175 176 static int fsa9480_read_reg(struct fsa9480_usbsw *usbsw, int reg) 177 { 178 int ret, val; 179 180 ret = regmap_read(usbsw->regmap, reg, &val); 181 if (ret < 0) { 182 dev_err(usbsw->dev, "%s: err %d\n", __func__, ret); 183 return ret; 184 } 185 186 return val; 187 } 188 189 static int fsa9480_read_irq(struct fsa9480_usbsw *usbsw, int *value) 190 { 191 u8 regs[2]; 192 int ret; 193 194 ret = regmap_bulk_read(usbsw->regmap, FSA9480_REG_INT1, regs, 2); 195 if (ret < 0) 196 dev_err(usbsw->dev, "%s: err %d\n", __func__, ret); 197 198 *value = regs[1] << 8 | regs[0]; 199 return ret; 200 } 201 202 static void fsa9480_handle_change(struct fsa9480_usbsw *usbsw, 203 u16 mask, bool attached) 204 { 205 while (mask) { 206 int dev = fls64(mask) - 1; 207 u64 cables = cable_types[dev]; 208 209 while (cables) { 210 int cable = fls64(cables) - 1; 211 212 extcon_set_state_sync(usbsw->edev, cable, attached); 213 cables &= ~BIT_ULL(cable); 214 } 215 216 mask &= ~BIT_ULL(dev); 217 } 218 } 219 220 static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw) 221 { 222 int val1, val2; 223 u16 val; 224 225 val1 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T1); 226 val2 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T2); 227 if (val1 < 0 || val2 < 0) { 228 dev_err(usbsw->dev, "%s: failed to read registers", __func__); 229 return; 230 } 231 val = val2 << 8 | val1; 232 233 dev_info(usbsw->dev, "dev1: 0x%x, dev2: 0x%x\n", val1, val2); 234 235 /* handle detached cables first */ 236 fsa9480_handle_change(usbsw, usbsw->cable & ~val, false); 237 238 /* then handle attached ones */ 239 fsa9480_handle_change(usbsw, val & ~usbsw->cable, true); 240 241 usbsw->cable = val; 242 } 243 244 static irqreturn_t fsa9480_irq_handler(int irq, void *data) 245 { 246 struct fsa9480_usbsw *usbsw = data; 247 int intr = 0; 248 249 /* clear interrupt */ 250 fsa9480_read_irq(usbsw, &intr); 251 if (!intr) 252 return IRQ_NONE; 253 254 /* device detection */ 255 fsa9480_detect_dev(usbsw); 256 257 return IRQ_HANDLED; 258 } 259 260 static int fsa9480_probe(struct i2c_client *client, 261 const struct i2c_device_id *id) 262 { 263 struct fsa9480_usbsw *info; 264 int ret; 265 266 if (!client->irq) { 267 dev_err(&client->dev, "no interrupt provided\n"); 268 return -EINVAL; 269 } 270 271 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL); 272 if (!info) 273 return -ENOMEM; 274 info->dev = &client->dev; 275 276 i2c_set_clientdata(client, info); 277 278 /* External connector */ 279 info->edev = devm_extcon_dev_allocate(info->dev, 280 fsa9480_extcon_cable); 281 if (IS_ERR(info->edev)) { 282 dev_err(info->dev, "failed to allocate memory for extcon\n"); 283 ret = -ENOMEM; 284 return ret; 285 } 286 287 ret = devm_extcon_dev_register(info->dev, info->edev); 288 if (ret) { 289 dev_err(info->dev, "failed to register extcon device\n"); 290 return ret; 291 } 292 293 info->regmap = devm_regmap_init_i2c(client, &fsa9480_regmap_config); 294 if (IS_ERR(info->regmap)) { 295 ret = PTR_ERR(info->regmap); 296 dev_err(info->dev, "failed to allocate register map: %d\n", 297 ret); 298 return ret; 299 } 300 301 /* ADC Detect Time: 500ms */ 302 fsa9480_write_reg(info, FSA9480_REG_TIMING1, TIMING1_ADC_500MS); 303 304 /* configure automatic switching */ 305 fsa9480_write_reg(info, FSA9480_REG_CTRL, CON_MASK); 306 307 /* unmask interrupt (attach/detach only) */ 308 fsa9480_write_reg(info, FSA9480_REG_INT1_MASK, 309 INT1_MASK & ~(INT_ATTACH | INT_DETACH)); 310 fsa9480_write_reg(info, FSA9480_REG_INT2_MASK, INT2_MASK); 311 312 ret = devm_request_threaded_irq(info->dev, client->irq, NULL, 313 fsa9480_irq_handler, 314 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 315 "fsa9480", info); 316 if (ret) { 317 dev_err(info->dev, "failed to request IRQ\n"); 318 return ret; 319 } 320 321 device_init_wakeup(info->dev, true); 322 fsa9480_detect_dev(info); 323 324 return 0; 325 } 326 327 #ifdef CONFIG_PM_SLEEP 328 static int fsa9480_suspend(struct device *dev) 329 { 330 struct i2c_client *client = to_i2c_client(dev); 331 332 if (device_may_wakeup(&client->dev) && client->irq) 333 enable_irq_wake(client->irq); 334 335 return 0; 336 } 337 338 static int fsa9480_resume(struct device *dev) 339 { 340 struct i2c_client *client = to_i2c_client(dev); 341 342 if (device_may_wakeup(&client->dev) && client->irq) 343 disable_irq_wake(client->irq); 344 345 return 0; 346 } 347 #endif 348 349 static const struct dev_pm_ops fsa9480_pm_ops = { 350 SET_SYSTEM_SLEEP_PM_OPS(fsa9480_suspend, fsa9480_resume) 351 }; 352 353 static const struct i2c_device_id fsa9480_id[] = { 354 { "fsa9480", 0 }, 355 {} 356 }; 357 MODULE_DEVICE_TABLE(i2c, fsa9480_id); 358 359 static const struct of_device_id fsa9480_of_match[] = { 360 { .compatible = "fcs,fsa9480", }, 361 { .compatible = "fcs,fsa880", }, 362 { .compatible = "ti,tsu6111", }, 363 { }, 364 }; 365 MODULE_DEVICE_TABLE(of, fsa9480_of_match); 366 367 static struct i2c_driver fsa9480_i2c_driver = { 368 .driver = { 369 .name = "fsa9480", 370 .pm = &fsa9480_pm_ops, 371 .of_match_table = fsa9480_of_match, 372 }, 373 .probe = fsa9480_probe, 374 .id_table = fsa9480_id, 375 }; 376 377 static int __init fsa9480_module_init(void) 378 { 379 return i2c_add_driver(&fsa9480_i2c_driver); 380 } 381 subsys_initcall(fsa9480_module_init); 382 383 static void __exit fsa9480_module_exit(void) 384 { 385 i2c_del_driver(&fsa9480_i2c_driver); 386 } 387 module_exit(fsa9480_module_exit); 388 389 MODULE_DESCRIPTION("Fairchild Semiconductor FSA9480 extcon driver"); 390 MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>"); 391 MODULE_LICENSE("GPL"); 392