drivers/misc/fsa9480.c

   1 /*
   2  * fsa9480.c - FSA9480 micro USB switch device driver
   3  *
   4  * Copyright (C) 2010 Samsung Electronics
   5  * Minkyu Kang <mk7.kang@samsung.com>
   6  * Wonguk Jeong <wonguk.jeong@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/i2c.h>
  17 #include <linux/platform_data/fsa9480.h>
  18 #include <linux/irq.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23 #include <linux/pm_runtime.h>
  24
  25 /* FSA9480 I2C registers */
  26 #define FSA9480_REG_DEVID               0x01
  27 #define FSA9480_REG_CTRL                0x02
  28 #define FSA9480_REG_INT1                0x03
  29 #define FSA9480_REG_INT2                0x04
  30 #define FSA9480_REG_INT1_MASK           0x05
  31 #define FSA9480_REG_INT2_MASK           0x06
  32 #define FSA9480_REG_ADC                 0x07
  33 #define FSA9480_REG_TIMING1             0x08
  34 #define FSA9480_REG_TIMING2             0x09
  35 #define FSA9480_REG_DEV_T1              0x0a
  36 #define FSA9480_REG_DEV_T2              0x0b
  37 #define FSA9480_REG_BTN1                0x0c
  38 #define FSA9480_REG_BTN2                0x0d
  39 #define FSA9480_REG_CK                  0x0e
  40 #define FSA9480_REG_CK_INT1             0x0f
  41 #define FSA9480_REG_CK_INT2             0x10
  42 #define FSA9480_REG_CK_INTMASK1         0x11
  43 #define FSA9480_REG_CK_INTMASK2         0x12
  44 #define FSA9480_REG_MANSW1              0x13
  45 #define FSA9480_REG_MANSW2              0x14
  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             (1 << 7)
  58 #define DEV_DEDICATED_CHG       (1 << 6)
  59 #define DEV_USB_CHG             (1 << 5)
  60 #define DEV_CAR_KIT             (1 << 4)
  61 #define DEV_UART                (1 << 3)
  62 #define DEV_USB                 (1 << 2)
  63 #define DEV_AUDIO_2             (1 << 1)
  64 #define DEV_AUDIO_1             (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                  (1 << 6)
  72 #define DEV_TTY                 (1 << 5)
  73 #define DEV_PPD                 (1 << 4)
  74 #define DEV_JIG_UART_OFF        (1 << 3)
  75 #define DEV_JIG_UART_ON         (1 << 2)
  76 #define DEV_JIG_USB_OFF         (1 << 1)
  77 #define DEV_JIG_USB_ON          (1 << 0)
  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 INT_DETACH              (1 << 1)
  97 #define INT_ATTACH              (1 << 0)
  98
  99 struct fsa9480_usbsw {
 100         struct i2c_client               *client;
 101         struct fsa9480_platform_data    *pdata;
 102         int                             dev1;
 103         int                             dev2;
 104         int                             mansw;
 105 };
 106
 107 static struct fsa9480_usbsw *chip;
 108
 109 static int fsa9480_write_reg(struct i2c_client *client,
 110                 int reg, int value)
 111 {
 112         int ret;
 113
 114         ret = i2c_smbus_write_byte_data(client, reg, value);
 115
 116         if (ret < 0)
 117                 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
 118
 119         return ret;
 120 }
 121
 122 static int fsa9480_read_reg(struct i2c_client *client, int reg)
 123 {
 124         int ret;
 125
 126         ret = i2c_smbus_read_byte_data(client, reg);
 127
 128         if (ret < 0)
 129                 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
 130
 131         return ret;
 132 }
 133
 134 static int fsa9480_read_irq(struct i2c_client *client, int *value)
 135 {
 136         int ret;
 137
 138         ret = i2c_smbus_read_i2c_block_data(client,
 139                         FSA9480_REG_INT1, 2, (u8 *)value);
 140         *value &= 0xffff;
 141
 142         if (ret < 0)
 143                 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
 144
 145         return ret;
 146 }
 147
 148 static void fsa9480_set_switch(const char *buf)
 149 {
 150         struct fsa9480_usbsw *usbsw = chip;
 151         struct i2c_client *client = usbsw->client;
 152         unsigned int value;
 153         unsigned int path = 0;
 154
 155         value = fsa9480_read_reg(client, FSA9480_REG_CTRL);
 156
 157         if (!strncmp(buf, "VAUDIO", 6)) {
 158                 path = SW_VAUDIO;
 159                 value &= ~CON_MANUAL_SW;
 160         } else if (!strncmp(buf, "UART", 4)) {
 161                 path = SW_UART;
 162                 value &= ~CON_MANUAL_SW;
 163         } else if (!strncmp(buf, "AUDIO", 5)) {
 164                 path = SW_AUDIO;
 165                 value &= ~CON_MANUAL_SW;
 166         } else if (!strncmp(buf, "DHOST", 5)) {
 167                 path = SW_DHOST;
 168                 value &= ~CON_MANUAL_SW;
 169         } else if (!strncmp(buf, "AUTO", 4)) {
 170                 path = SW_AUTO;
 171                 value |= CON_MANUAL_SW;
 172         } else {
 173                 printk(KERN_ERR "Wrong command\n");
 174                 return;
 175         }
 176
 177         usbsw->mansw = path;
 178         fsa9480_write_reg(client, FSA9480_REG_MANSW1, path);
 179         fsa9480_write_reg(client, FSA9480_REG_CTRL, value);
 180 }
 181
 182 static ssize_t fsa9480_get_switch(char *buf)
 183 {
 184         struct fsa9480_usbsw *usbsw = chip;
 185         struct i2c_client *client = usbsw->client;
 186         unsigned int value;
 187
 188         value = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
 189
 190         if (value == SW_VAUDIO)
 191                 return sprintf(buf, "VAUDIO\n");
 192         else if (value == SW_UART)
 193                 return sprintf(buf, "UART\n");
 194         else if (value == SW_AUDIO)
 195                 return sprintf(buf, "AUDIO\n");
 196         else if (value == SW_DHOST)
 197                 return sprintf(buf, "DHOST\n");
 198         else if (value == SW_AUTO)
 199                 return sprintf(buf, "AUTO\n");
 200         else
 201                 return sprintf(buf, "%x", value);
 202 }
 203
 204 static ssize_t fsa9480_show_device(struct device *dev,
 205                                    struct device_attribute *attr,
 206                                    char *buf)
 207 {
 208         struct fsa9480_usbsw *usbsw = dev_get_drvdata(dev);
 209         struct i2c_client *client = usbsw->client;
 210         int dev1, dev2;
 211
 212         dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
 213         dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
 214
 215         if (!dev1 && !dev2)
 216                 return sprintf(buf, "NONE\n");
 217
 218         /* USB */
 219         if (dev1 & DEV_T1_USB_MASK || dev2 & DEV_T2_USB_MASK)
 220                 return sprintf(buf, "USB\n");
 221
 222         /* UART */
 223         if (dev1 & DEV_T1_UART_MASK || dev2 & DEV_T2_UART_MASK)
 224                 return sprintf(buf, "UART\n");
 225
 226         /* CHARGER */
 227         if (dev1 & DEV_T1_CHARGER_MASK)
 228                 return sprintf(buf, "CHARGER\n");
 229
 230         /* JIG */
 231         if (dev2 & DEV_T2_JIG_MASK)
 232                 return sprintf(buf, "JIG\n");
 233
 234         return sprintf(buf, "UNKNOWN\n");
 235 }
 236
 237 static ssize_t fsa9480_show_manualsw(struct device *dev,
 238                 struct device_attribute *attr, char *buf)
 239 {
 240         return fsa9480_get_switch(buf);
 241
 242 }
 243
 244 static ssize_t fsa9480_set_manualsw(struct device *dev,
 245                                     struct device_attribute *attr,
 246                                     const char *buf, size_t count)
 247 {
 248         fsa9480_set_switch(buf);
 249
 250         return count;
 251 }
 252
 253 static DEVICE_ATTR(device, S_IRUGO, fsa9480_show_device, NULL);
 254 static DEVICE_ATTR(switch, S_IRUGO | S_IWUSR,
 255                 fsa9480_show_manualsw, fsa9480_set_manualsw);
 256
 257 static struct attribute *fsa9480_attributes[] = {
 258         &dev_attr_device.attr,
 259         &dev_attr_switch.attr,
 260         NULL
 261 };
 262
 263 static const struct attribute_group fsa9480_group = {
 264         .attrs = fsa9480_attributes,
 265 };
 266
 267 static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw, int intr)
 268 {
 269         int val1, val2, ctrl;
 270         struct fsa9480_platform_data *pdata = usbsw->pdata;
 271         struct i2c_client *client = usbsw->client;
 272
 273         val1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
 274         val2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
 275         ctrl = fsa9480_read_reg(client, FSA9480_REG_CTRL);
 276
 277         dev_info(&client->dev, "intr: 0x%x, dev1: 0x%x, dev2: 0x%x\n",
 278                         intr, val1, val2);
 279
 280         if (!intr)
 281                 goto out;
 282
 283         if (intr & INT_ATTACH) {        /* Attached */
 284                 /* USB */
 285                 if (val1 & DEV_T1_USB_MASK || val2 & DEV_T2_USB_MASK) {
 286                         if (pdata->usb_cb)
 287                                 pdata->usb_cb(FSA9480_ATTACHED);
 288
 289                         if (usbsw->mansw) {
 290                                 fsa9480_write_reg(client,
 291                                         FSA9480_REG_MANSW1, usbsw->mansw);
 292                         }
 293                 }
 294
 295                 /* UART */
 296                 if (val1 & DEV_T1_UART_MASK || val2 & DEV_T2_UART_MASK) {
 297                         if (pdata->uart_cb)
 298                                 pdata->uart_cb(FSA9480_ATTACHED);
 299
 300                         if (!(ctrl & CON_MANUAL_SW)) {
 301                                 fsa9480_write_reg(client,
 302                                         FSA9480_REG_MANSW1, SW_UART);
 303                         }
 304                 }
 305
 306                 /* CHARGER */
 307                 if (val1 & DEV_T1_CHARGER_MASK) {
 308                         if (pdata->charger_cb)
 309                                 pdata->charger_cb(FSA9480_ATTACHED);
 310                 }
 311
 312                 /* JIG */
 313                 if (val2 & DEV_T2_JIG_MASK) {
 314                         if (pdata->jig_cb)
 315                                 pdata->jig_cb(FSA9480_ATTACHED);
 316                 }
 317         } else if (intr & INT_DETACH) { /* Detached */
 318                 /* USB */
 319                 if (usbsw->dev1 & DEV_T1_USB_MASK ||
 320                         usbsw->dev2 & DEV_T2_USB_MASK) {
 321                         if (pdata->usb_cb)
 322                                 pdata->usb_cb(FSA9480_DETACHED);
 323                 }
 324
 325                 /* UART */
 326                 if (usbsw->dev1 & DEV_T1_UART_MASK ||
 327                         usbsw->dev2 & DEV_T2_UART_MASK) {
 328                         if (pdata->uart_cb)
 329                                 pdata->uart_cb(FSA9480_DETACHED);
 330                 }
 331
 332                 /* CHARGER */
 333                 if (usbsw->dev1 & DEV_T1_CHARGER_MASK) {
 334                         if (pdata->charger_cb)
 335                                 pdata->charger_cb(FSA9480_DETACHED);
 336                 }
 337
 338                 /* JIG */
 339                 if (usbsw->dev2 & DEV_T2_JIG_MASK) {
 340                         if (pdata->jig_cb)
 341                                 pdata->jig_cb(FSA9480_DETACHED);
 342                 }
 343         }
 344
 345         usbsw->dev1 = val1;
 346         usbsw->dev2 = val2;
 347
 348 out:
 349         ctrl &= ~CON_INT_MASK;
 350         fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
 351 }
 352
 353 static irqreturn_t fsa9480_irq_handler(int irq, void *data)
 354 {
 355         struct fsa9480_usbsw *usbsw = data;
 356         struct i2c_client *client = usbsw->client;
 357         int intr;
 358
 359         /* clear interrupt */
 360         fsa9480_read_irq(client, &intr);
 361
 362         /* device detection */
 363         fsa9480_detect_dev(usbsw, intr);
 364
 365         return IRQ_HANDLED;
 366 }
 367
 368 static int fsa9480_irq_init(struct fsa9480_usbsw *usbsw)
 369 {
 370         struct fsa9480_platform_data *pdata = usbsw->pdata;
 371         struct i2c_client *client = usbsw->client;
 372         int ret;
 373         int intr;
 374         unsigned int ctrl = CON_MASK;
 375
 376         /* clear interrupt */
 377         fsa9480_read_irq(client, &intr);
 378
 379         /* unmask interrupt (attach/detach only) */
 380         fsa9480_write_reg(client, FSA9480_REG_INT1_MASK, 0xfc);
 381         fsa9480_write_reg(client, FSA9480_REG_INT2_MASK, 0x1f);
 382
 383         usbsw->mansw = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
 384
 385         if (usbsw->mansw)
 386                 ctrl &= ~CON_MANUAL_SW; /* Manual Switching Mode */
 387
 388         fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
 389
 390         if (pdata && pdata->cfg_gpio)
 391                 pdata->cfg_gpio();
 392
 393         if (client->irq) {
 394                 ret = request_threaded_irq(client->irq, NULL,
 395                                 fsa9480_irq_handler,
 396                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 397                                 "fsa9480 micro USB", usbsw);
 398                 if (ret) {
 399                         dev_err(&client->dev, "failed to request IRQ\n");
 400                         return ret;
 401                 }
 402
 403                 if (pdata)
 404                         device_init_wakeup(&client->dev, pdata->wakeup);
 405         }
 406
 407         return 0;
 408 }
 409
 410 static int fsa9480_probe(struct i2c_client *client,
 411                          const struct i2c_device_id *id)
 412 {
 413         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 414         struct fsa9480_usbsw *usbsw;
 415         int ret = 0;
 416
 417         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 418                 return -EIO;
 419
 420         usbsw = kzalloc(sizeof(struct fsa9480_usbsw), GFP_KERNEL);
 421         if (!usbsw) {
 422                 dev_err(&client->dev, "failed to allocate driver data\n");
 423                 return -ENOMEM;
 424         }
 425
 426         usbsw->client = client;
 427         usbsw->pdata = client->dev.platform_data;
 428
 429         chip = usbsw;
 430
 431         i2c_set_clientdata(client, usbsw);
 432
 433         ret = fsa9480_irq_init(usbsw);
 434         if (ret)
 435                 goto fail1;
 436
 437         ret = sysfs_create_group(&client->dev.kobj, &fsa9480_group);
 438         if (ret) {
 439                 dev_err(&client->dev,
 440                                 "failed to create fsa9480 attribute group\n");
 441                 goto fail2;
 442         }
 443
 444         /* ADC Detect Time: 500ms */
 445         fsa9480_write_reg(client, FSA9480_REG_TIMING1, 0x6);
 446
 447         if (chip->pdata->reset_cb)
 448                 chip->pdata->reset_cb();
 449
 450         /* device detection */
 451         fsa9480_detect_dev(usbsw, INT_ATTACH);
 452
 453         pm_runtime_set_active(&client->dev);
 454
 455         return 0;
 456
 457 fail2:
 458         if (client->irq)
 459                 free_irq(client->irq, usbsw);
 460 fail1:
 461         kfree(usbsw);
 462         return ret;
 463 }
 464
 465 static int fsa9480_remove(struct i2c_client *client)
 466 {
 467         struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
 468
 469         if (client->irq)
 470                 free_irq(client->irq, usbsw);
 471
 472         sysfs_remove_group(&client->dev.kobj, &fsa9480_group);
 473         device_init_wakeup(&client->dev, 0);
 474         kfree(usbsw);
 475         return 0;
 476 }
 477
 478 #ifdef CONFIG_PM_SLEEP
 479
 480 static int fsa9480_suspend(struct device *dev)
 481 {
 482         struct i2c_client *client = to_i2c_client(dev);
 483         struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
 484         struct fsa9480_platform_data *pdata = usbsw->pdata;
 485
 486         if (device_may_wakeup(&client->dev) && client->irq)
 487                 enable_irq_wake(client->irq);
 488
 489         if (pdata->usb_power)
 490                 pdata->usb_power(0);
 491
 492         return 0;
 493 }
 494
 495 static int fsa9480_resume(struct device *dev)
 496 {
 497         struct i2c_client *client = to_i2c_client(dev);
 498         struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
 499         int dev1, dev2;
 500
 501         if (device_may_wakeup(&client->dev) && client->irq)
 502                 disable_irq_wake(client->irq);
 503
 504         /*
 505          * Clear Pending interrupt. Note that detect_dev does what
 506          * the interrupt handler does. So, we don't miss pending and
 507          * we reenable interrupt if there is one.
 508          */
 509         fsa9480_read_reg(client, FSA9480_REG_INT1);
 510         fsa9480_read_reg(client, FSA9480_REG_INT2);
 511
 512         dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
 513         dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
 514
 515         /* device detection */
 516         fsa9480_detect_dev(usbsw, (dev1 || dev2) ? INT_ATTACH : INT_DETACH);
 517
 518         return 0;
 519 }
 520
 521 static SIMPLE_DEV_PM_OPS(fsa9480_pm_ops, fsa9480_suspend, fsa9480_resume);
 522 #define FSA9480_PM_OPS (&fsa9480_pm_ops)
 523
 524 #else
 525
 526 #define FSA9480_PM_OPS NULL
 527
 528 #endif /* CONFIG_PM_SLEEP */
 529
 530 static const struct i2c_device_id fsa9480_id[] = {
 531         {"fsa9480", 0},
 532         {}
 533 };
 534 MODULE_DEVICE_TABLE(i2c, fsa9480_id);
 535
 536 static struct i2c_driver fsa9480_i2c_driver = {
 537         .driver = {
 538                 .name = "fsa9480",
 539                 .pm = FSA9480_PM_OPS,
 540         },
 541         .probe = fsa9480_probe,
 542         .remove = fsa9480_remove,
 543         .id_table = fsa9480_id,
 544 };
 545
 546 module_i2c_driver(fsa9480_i2c_driver);
 547
 548 MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
 549 MODULE_DESCRIPTION("FSA9480 USB Switch driver");
 550 MODULE_LICENSE("GPL");