drivers/platform/x86/asus-tf103c-dock.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * This is a driver for the keyboard, touchpad and USB port of the
   4  * keyboard dock for the Asus TF103C 2-in-1 tablet.
   5  *
   6  * This keyboard dock has its own I2C attached embedded controller
   7  * and the keyboard and touchpad are also connected over I2C,
   8  * instead of using the usual USB connection. This means that the
   9  * keyboard dock requires this special driver to function.
  10  *
  11  * Copyright (C) 2021 Hans de Goede <hdegoede@redhat.com>
  12  */
  13
  14 #include <linux/acpi.h>
  15 #include <linux/delay.h>
  16 #include <linux/dmi.h>
  17 #include <linux/gpio/consumer.h>
  18 #include <linux/gpio/machine.h>
  19 #include <linux/hid.h>
  20 #include <linux/i2c.h>
  21 #include <linux/input.h>
  22 #include <linux/irq.h>
  23 #include <linux/irqdomain.h>
  24 #include <linux/mod_devicetable.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/module.h>
  27 #include <linux/pm.h>
  28 #include <linux/workqueue.h>
  29 #include <asm/unaligned.h>
  30
  31 static bool fnlock;
  32 module_param(fnlock, bool, 0644);
  33 MODULE_PARM_DESC(fnlock,
  34                  "By default the kbd toprow sends multimedia key presses. AltGr "
  35                  "can be pressed to change this to F1-F12. Set this to 1 to "
  36                  "change the default. Press AltGr + Esc to toggle at runtime.");
  37
  38 #define TF103C_DOCK_DEV_NAME                            "NPCE69A:00"
  39
  40 #define TF103C_DOCK_HPD_DEBOUNCE                        msecs_to_jiffies(20)
  41
  42 /*** Touchpad I2C device defines ***/
  43 #define TF103C_DOCK_TP_ADDR                             0x15
  44
  45 /*** Keyboard I2C device defines **A*/
  46 #define TF103C_DOCK_KBD_ADDR                            0x16
  47
  48 #define TF103C_DOCK_KBD_DATA_REG                        0x73
  49 #define TF103C_DOCK_KBD_DATA_MIN_LENGTH                 4
  50 #define TF103C_DOCK_KBD_DATA_MAX_LENGTH                 11
  51 #define TF103C_DOCK_KBD_DATA_MODIFIERS                  3
  52 #define TF103C_DOCK_KBD_DATA_KEYS                       5
  53 #define TF103C_DOCK_KBD_CMD_REG                         0x75
  54
  55 #define TF103C_DOCK_KBD_CMD_ENABLE                      0x0800
  56
  57 /*** EC innterrupt data I2C device defines ***/
  58 #define TF103C_DOCK_INTR_ADDR                           0x19
  59 #define TF103C_DOCK_INTR_DATA_REG                       0x6a
  60
  61 #define TF103C_DOCK_INTR_DATA1_OBF_MASK                 0x01
  62 #define TF103C_DOCK_INTR_DATA1_KEY_MASK                 0x04
  63 #define TF103C_DOCK_INTR_DATA1_KBC_MASK                 0x08
  64 #define TF103C_DOCK_INTR_DATA1_AUX_MASK                 0x20
  65 #define TF103C_DOCK_INTR_DATA1_SCI_MASK                 0x40
  66 #define TF103C_DOCK_INTR_DATA1_SMI_MASK                 0x80
  67 /* Special values for the OOB data on kbd_client / tp_client */
  68 #define TF103C_DOCK_INTR_DATA1_OOB_VALUE                0xc1
  69 #define TF103C_DOCK_INTR_DATA2_OOB_VALUE                0x04
  70
  71 #define TF103C_DOCK_SMI_AC_EVENT                        0x31
  72 #define TF103C_DOCK_SMI_HANDSHAKING                     0x50
  73 #define TF103C_DOCK_SMI_EC_WAKEUP                       0x53
  74 #define TF103C_DOCK_SMI_BOOTBLOCK_RESET                 0x5e
  75 #define TF103C_DOCK_SMI_WATCHDOG_RESET                  0x5f
  76 #define TF103C_DOCK_SMI_ADAPTER_CHANGE                  0x60
  77 #define TF103C_DOCK_SMI_DOCK_INSERT                     0x61
  78 #define TF103C_DOCK_SMI_DOCK_REMOVE                     0x62
  79 #define TF103C_DOCK_SMI_PAD_BL_CHANGE                   0x63
  80 #define TF103C_DOCK_SMI_HID_STATUS_CHANGED              0x64
  81 #define TF103C_DOCK_SMI_HID_WAKEUP                      0x65
  82 #define TF103C_DOCK_SMI_S3                              0x83
  83 #define TF103C_DOCK_SMI_S5                              0x85
  84 #define TF103C_DOCK_SMI_NOTIFY_SHUTDOWN                 0x90
  85 #define TF103C_DOCK_SMI_RESUME                          0x91
  86
  87 /*** EC (dockram) I2C device defines ***/
  88 #define TF103C_DOCK_EC_ADDR                             0x1b
  89
  90 #define TF103C_DOCK_EC_CMD_REG                          0x0a
  91 #define TF103C_DOCK_EC_CMD_LEN                          9
  92
  93 enum {
  94         TF103C_DOCK_FLAG_HID_OPEN,
  95 };
  96
  97 struct tf103c_dock_data {
  98         struct delayed_work hpd_work;
  99         struct irq_chip tp_irqchip;
 100         struct irq_domain *tp_irq_domain;
 101         struct i2c_client *ec_client;
 102         struct i2c_client *intr_client;
 103         struct i2c_client *kbd_client;
 104         struct i2c_client *tp_client;
 105         struct gpio_desc *pwr_en;
 106         struct gpio_desc *irq_gpio;
 107         struct gpio_desc *hpd_gpio;
 108         struct input_dev *input;
 109         struct hid_device *hid;
 110         unsigned long flags;
 111         int board_rev;
 112         int irq;
 113         int hpd_irq;
 114         int tp_irq;
 115         int last_press_0x13;
 116         int last_press_0x14;
 117         bool enabled;
 118         bool tp_enabled;
 119         bool altgr_pressed;
 120         bool esc_pressed;
 121         bool filter_esc;
 122         u8 kbd_buf[TF103C_DOCK_KBD_DATA_MAX_LENGTH];
 123 };
 124
 125 static struct gpiod_lookup_table tf103c_dock_gpios = {
 126         .dev_id = "i2c-" TF103C_DOCK_DEV_NAME,
 127         .table = {
 128                 GPIO_LOOKUP("INT33FC:00",      55, "dock_pwr_en", GPIO_ACTIVE_HIGH),
 129                 GPIO_LOOKUP("INT33FC:02",       1, "dock_irq", GPIO_ACTIVE_HIGH),
 130                 GPIO_LOOKUP("INT33FC:02",      29, "dock_hpd", GPIO_ACTIVE_HIGH),
 131                 GPIO_LOOKUP("gpio_crystalcove", 2, "board_rev", GPIO_ACTIVE_HIGH),
 132                 {}
 133         },
 134 };
 135
 136 /* Byte 0 is the length of the rest of the packet */
 137 static const u8 tf103c_dock_enable_cmd[9] = { 8, 0x20, 0, 0, 0, 0, 0x20, 0, 0 };
 138 static const u8 tf103c_dock_usb_enable_cmd[9] = { 8, 0, 0, 0, 0, 0, 0, 0x40, 0 };
 139 static const u8 tf103c_dock_suspend_cmd[9] = { 8, 0, 0x20, 0, 0, 0x22, 0, 0, 0 };
 140
 141 /*** keyboard related code ***/
 142
 143 static u8 tf103c_dock_kbd_hid_desc[] = {
 144         0x05, 0x01,         /*  Usage Page (Desktop),               */
 145         0x09, 0x06,         /*  Usage (Keyboard),                   */
 146         0xA1, 0x01,         /*  Collection (Application),           */
 147         0x85, 0x11,         /*      Report ID (17),                 */
 148         0x95, 0x08,         /*      Report Count (8),               */
 149         0x75, 0x01,         /*      Report Size (1),                */
 150         0x15, 0x00,         /*      Logical Minimum (0),            */
 151         0x25, 0x01,         /*      Logical Maximum (1),            */
 152         0x05, 0x07,         /*      Usage Page (Keyboard),          */
 153         0x19, 0xE0,         /*      Usage Minimum (KB Leftcontrol), */
 154         0x29, 0xE7,         /*      Usage Maximum (KB Right GUI),   */
 155         0x81, 0x02,         /*      Input (Variable),               */
 156         0x95, 0x01,         /*      Report Count (1),               */
 157         0x75, 0x08,         /*      Report Size (8),                */
 158         0x81, 0x01,         /*      Input (Constant),               */
 159         0x95, 0x06,         /*      Report Count (6),               */
 160         0x75, 0x08,         /*      Report Size (8),                */
 161         0x15, 0x00,         /*      Logical Minimum (0),            */
 162         0x26, 0xFF, 0x00,   /*      Logical Maximum (255),          */
 163         0x05, 0x07,         /*      Usage Page (Keyboard),          */
 164         0x19, 0x00,         /*      Usage Minimum (None),           */
 165         0x2A, 0xFF, 0x00,   /*      Usage Maximum (FFh),            */
 166         0x81, 0x00,         /*      Input,                          */
 167         0xC0                /*  End Collection                      */
 168 };
 169
 170 static int tf103c_dock_kbd_read(struct tf103c_dock_data *dock)
 171 {
 172         struct i2c_client *client = dock->kbd_client;
 173         struct device *dev = &dock->ec_client->dev;
 174         struct i2c_msg msgs[2];
 175         u8 reg[2];
 176         int ret;
 177
 178         reg[0] = TF103C_DOCK_KBD_DATA_REG & 0xff;
 179         reg[1] = TF103C_DOCK_KBD_DATA_REG >> 8;
 180
 181         msgs[0].addr = client->addr;
 182         msgs[0].flags = 0;
 183         msgs[0].len = sizeof(reg);
 184         msgs[0].buf = reg;
 185
 186         msgs[1].addr = client->addr;
 187         msgs[1].flags = I2C_M_RD;
 188         msgs[1].len = TF103C_DOCK_KBD_DATA_MAX_LENGTH;
 189         msgs[1].buf = dock->kbd_buf;
 190
 191         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 192         if (ret != ARRAY_SIZE(msgs)) {
 193                 dev_err(dev, "error %d reading kbd data\n", ret);
 194                 return -EIO;
 195         }
 196
 197         return 0;
 198 }
 199
 200 static void tf103c_dock_kbd_write(struct tf103c_dock_data *dock, u16 cmd)
 201 {
 202         struct device *dev = &dock->ec_client->dev;
 203         u8 buf[4];
 204         int ret;
 205
 206         put_unaligned_le16(TF103C_DOCK_KBD_CMD_REG, &buf[0]);
 207         put_unaligned_le16(cmd, &buf[2]);
 208
 209         ret = i2c_master_send(dock->kbd_client, buf, sizeof(buf));
 210         if (ret != sizeof(buf))
 211                 dev_err(dev, "error %d writing kbd cmd\n", ret);
 212 }
 213
 214 /* HID ll_driver functions for forwarding input-reports from the kbd_client */
 215 static int tf103c_dock_hid_parse(struct hid_device *hid)
 216 {
 217         return hid_parse_report(hid, tf103c_dock_kbd_hid_desc,
 218                                 sizeof(tf103c_dock_kbd_hid_desc));
 219 }
 220
 221 static int tf103c_dock_hid_start(struct hid_device *hid)
 222 {
 223         return 0;
 224 }
 225
 226 static void tf103c_dock_hid_stop(struct hid_device *hid)
 227 {
 228         hid->claimed = 0;
 229 }
 230
 231 static int tf103c_dock_hid_open(struct hid_device *hid)
 232 {
 233         struct tf103c_dock_data *dock = hid->driver_data;
 234
 235         set_bit(TF103C_DOCK_FLAG_HID_OPEN, &dock->flags);
 236         return 0;
 237 }
 238
 239 static void tf103c_dock_hid_close(struct hid_device *hid)
 240 {
 241         struct tf103c_dock_data *dock = hid->driver_data;
 242
 243         clear_bit(TF103C_DOCK_FLAG_HID_OPEN, &dock->flags);
 244 }
 245
 246 /* Mandatory, but not used */
 247 static int tf103c_dock_hid_raw_request(struct hid_device *hid, u8 reportnum,
 248                                        u8 *buf, size_t len, u8 rtype, int reqtype)
 249 {
 250         return 0;
 251 }
 252
 253 static struct hid_ll_driver tf103c_dock_hid_ll_driver = {
 254         .parse = tf103c_dock_hid_parse,
 255         .start = tf103c_dock_hid_start,
 256         .stop = tf103c_dock_hid_stop,
 257         .open = tf103c_dock_hid_open,
 258         .close = tf103c_dock_hid_close,
 259         .raw_request = tf103c_dock_hid_raw_request,
 260 };
 261
 262 static int tf103c_dock_toprow_codes[13][2] = {
 263         /* Normal,            AltGr pressed */
 264         { KEY_POWER,          KEY_F1 },
 265         { KEY_RFKILL,         KEY_F2 },
 266         { KEY_F21,            KEY_F3 }, /* Touchpad toggle, userspace expects F21 */
 267         { KEY_BRIGHTNESSDOWN, KEY_F4 },
 268         { KEY_BRIGHTNESSUP,   KEY_F5 },
 269         { KEY_CAMERA,         KEY_F6 },
 270         { KEY_CONFIG,         KEY_F7 },
 271         { KEY_PREVIOUSSONG,   KEY_F8 },
 272         { KEY_PLAYPAUSE,      KEY_F9 },
 273         { KEY_NEXTSONG,       KEY_F10 },
 274         { KEY_MUTE,           KEY_F11 },
 275         { KEY_VOLUMEDOWN,     KEY_F12 },
 276         { KEY_VOLUMEUP,       KEY_SYSRQ },
 277 };
 278
 279 static void tf103c_dock_report_toprow_kbd_hook(struct tf103c_dock_data *dock)
 280 {
 281         u8 *esc, *buf = dock->kbd_buf;
 282         int size;
 283
 284         /*
 285          * Stop AltGr reports from getting reported on the "Asus TF103C Dock
 286          * Keyboard" input_dev, since this gets used as "Fn" key for the toprow
 287          * keys. Instead we report this on the "Asus TF103C Dock Top Row Keys"
 288          * input_dev, when not used to modify the toprow keys.
 289          */
 290         dock->altgr_pressed = buf[TF103C_DOCK_KBD_DATA_MODIFIERS] & 0x40;
 291         buf[TF103C_DOCK_KBD_DATA_MODIFIERS] &= ~0x40;
 292
 293         input_report_key(dock->input, KEY_RIGHTALT, dock->altgr_pressed);
 294         input_sync(dock->input);
 295
 296         /* Toggle fnlock on AltGr + Esc press */
 297         buf = buf + TF103C_DOCK_KBD_DATA_KEYS;
 298         size = TF103C_DOCK_KBD_DATA_MAX_LENGTH - TF103C_DOCK_KBD_DATA_KEYS;
 299         esc = memchr(buf, 0x29, size);
 300         if (!dock->esc_pressed && esc) {
 301                 if (dock->altgr_pressed) {
 302                         fnlock = !fnlock;
 303                         dock->filter_esc = true;
 304                 }
 305         }
 306         if (esc && dock->filter_esc)
 307                 *esc = 0;
 308         else
 309                 dock->filter_esc = false;
 310
 311         dock->esc_pressed = esc != NULL;
 312 }
 313
 314 static void tf103c_dock_toprow_press(struct tf103c_dock_data *dock, int key_code)
 315 {
 316         /*
 317          * Release AltGr before reporting the toprow key, so that userspace
 318          * sees e.g. just KEY_SUSPEND and not AltGr + KEY_SUSPEND.
 319          */
 320         if (dock->altgr_pressed) {
 321                 input_report_key(dock->input, KEY_RIGHTALT, false);
 322                 input_sync(dock->input);
 323         }
 324
 325         input_report_key(dock->input, key_code, true);
 326         input_sync(dock->input);
 327 }
 328
 329 static void tf103c_dock_toprow_release(struct tf103c_dock_data *dock, int key_code)
 330 {
 331         input_report_key(dock->input, key_code, false);
 332         input_sync(dock->input);
 333
 334         if (dock->altgr_pressed) {
 335                 input_report_key(dock->input, KEY_RIGHTALT, true);
 336                 input_sync(dock->input);
 337         }
 338 }
 339
 340 static void tf103c_dock_toprow_event(struct tf103c_dock_data *dock,
 341                                             int toprow_index, int *last_press)
 342 {
 343         int key_code, fn = dock->altgr_pressed ^ fnlock;
 344
 345         if (last_press && *last_press) {
 346                 tf103c_dock_toprow_release(dock, *last_press);
 347                 *last_press = 0;
 348         }
 349
 350         if (toprow_index < 0)
 351                 return;
 352
 353         key_code = tf103c_dock_toprow_codes[toprow_index][fn];
 354         tf103c_dock_toprow_press(dock, key_code);
 355
 356         if (last_press)
 357                 *last_press = key_code;
 358         else
 359                 tf103c_dock_toprow_release(dock, key_code);
 360 }
 361
 362 /*
 363  * The keyboard sends what appears to be standard I2C-HID input-reports,
 364  * except that a 16 bit register address of where the I2C-HID format
 365  * input-reports are stored must be send before reading it in a single
 366  * (I2C repeated-start) I2C transaction.
 367  *
 368  * Its unknown how to get the HID descriptors but they are easy to reconstruct:
 369  *
 370  * Input report id 0x11 is 8 bytes long and contain standard USB HID intf-class,
 371  * Boot Interface Subclass reports.
 372  * Input report id 0x13 is 2 bytes long and sends Consumer Control events
 373  * Input report id 0x14 is 1 byte long and sends System Control events
 374  *
 375  * However the top row keys (where a normal keyboard has F1-F12 + Print-Screen)
 376  * are a mess, using a mix of the 0x13 and 0x14 input reports as well as EC SCI
 377  * events; and these need special handling to allow actually sending F1-F12,
 378  * since the Fn key on the keyboard only works on the cursor keys and the top
 379  * row keys always send their special "Multimedia hotkey" codes.
 380  *
 381  * So only forward the 0x11 reports to HID and handle the top-row keys here.
 382  */
 383 static void tf103c_dock_kbd_interrupt(struct tf103c_dock_data *dock)
 384 {
 385         struct device *dev = &dock->ec_client->dev;
 386         u8 *buf = dock->kbd_buf;
 387         int size;
 388
 389         if (tf103c_dock_kbd_read(dock))
 390                 return;
 391
 392         size = buf[0] | buf[1] << 8;
 393         if (size < TF103C_DOCK_KBD_DATA_MIN_LENGTH ||
 394             size > TF103C_DOCK_KBD_DATA_MAX_LENGTH) {
 395                 dev_err(dev, "error reported kbd pkt size %d is out of range %d-%d\n", size,
 396                         TF103C_DOCK_KBD_DATA_MIN_LENGTH,
 397                         TF103C_DOCK_KBD_DATA_MAX_LENGTH);
 398                 return;
 399         }
 400
 401         switch (buf[2]) {
 402         case 0x11:
 403                 if (size != 11)
 404                         break;
 405
 406                 tf103c_dock_report_toprow_kbd_hook(dock);
 407
 408                 if (test_bit(TF103C_DOCK_FLAG_HID_OPEN, &dock->flags))
 409                         hid_input_report(dock->hid, HID_INPUT_REPORT, buf + 2, size - 2, 1);
 410                 return;
 411         case 0x13:
 412                 if (size != 5)
 413                         break;
 414
 415                 switch (buf[3] | buf[4] << 8) {
 416                 case 0:
 417                         tf103c_dock_toprow_event(dock, -1, &dock->last_press_0x13);
 418                         return;
 419                 case 0x70:
 420                         tf103c_dock_toprow_event(dock, 3, &dock->last_press_0x13);
 421                         return;
 422                 case 0x6f:
 423                         tf103c_dock_toprow_event(dock, 4, &dock->last_press_0x13);
 424                         return;
 425                 case 0xb6:
 426                         tf103c_dock_toprow_event(dock, 7, &dock->last_press_0x13);
 427                         return;
 428                 case 0xcd:
 429                         tf103c_dock_toprow_event(dock, 8, &dock->last_press_0x13);
 430                         return;
 431                 case 0xb5:
 432                         tf103c_dock_toprow_event(dock, 9, &dock->last_press_0x13);
 433                         return;
 434                 case 0xe2:
 435                         tf103c_dock_toprow_event(dock, 10, &dock->last_press_0x13);
 436                         return;
 437                 case 0xea:
 438                         tf103c_dock_toprow_event(dock, 11, &dock->last_press_0x13);
 439                         return;
 440                 case 0xe9:
 441                         tf103c_dock_toprow_event(dock, 12, &dock->last_press_0x13);
 442                         return;
 443                 }
 444                 break;
 445         case 0x14:
 446                 if (size != 4)
 447                         break;
 448
 449                 switch (buf[3]) {
 450                 case 0:
 451                         tf103c_dock_toprow_event(dock, -1, &dock->last_press_0x14);
 452                         return;
 453                 case 1:
 454                         tf103c_dock_toprow_event(dock, 0, &dock->last_press_0x14);
 455                         return;
 456                 }
 457                 break;
 458         }
 459
 460         dev_warn(dev, "warning unknown kbd data: %*ph\n", size, buf);
 461 }
 462
 463 /*** touchpad related code ***/
 464
 465 static const struct property_entry tf103c_dock_touchpad_props[] = {
 466         PROPERTY_ENTRY_BOOL("elan,clickpad"),
 467         { }
 468 };
 469
 470 static const struct software_node tf103c_dock_touchpad_sw_node = {
 471         .properties = tf103c_dock_touchpad_props,
 472 };
 473
 474 /*
 475  * tf103c_enable_touchpad() is only called from the threaded interrupt handler
 476  * and tf103c_disable_touchpad() is only called after the irq is disabled,
 477  * so no locking is necessary.
 478  */
 479 static void tf103c_dock_enable_touchpad(struct tf103c_dock_data *dock)
 480 {
 481         struct i2c_board_info board_info = { };
 482         struct device *dev = &dock->ec_client->dev;
 483         int ret;
 484
 485         if (dock->tp_enabled) {
 486                 /* Happens after resume, the tp needs to be reinitialized */
 487                 ret = device_reprobe(&dock->tp_client->dev);
 488                 if (ret)
 489                         dev_err_probe(dev, ret, "reprobing tp-client\n");
 490                 return;
 491         }
 492
 493         strscpy(board_info.type, "elan_i2c", I2C_NAME_SIZE);
 494         board_info.addr = TF103C_DOCK_TP_ADDR;
 495         board_info.dev_name = TF103C_DOCK_DEV_NAME "-tp";
 496         board_info.irq = dock->tp_irq;
 497         board_info.swnode = &tf103c_dock_touchpad_sw_node;
 498
 499         dock->tp_client = i2c_new_client_device(dock->ec_client->adapter, &board_info);
 500         if (IS_ERR(dock->tp_client)) {
 501                 dev_err(dev, "error %ld creating tp client\n", PTR_ERR(dock->tp_client));
 502                 return;
 503         }
 504
 505         dock->tp_enabled = true;
 506 }
 507
 508 static void tf103c_dock_disable_touchpad(struct tf103c_dock_data *dock)
 509 {
 510         if (!dock->tp_enabled)
 511                 return;
 512
 513         i2c_unregister_device(dock->tp_client);
 514
 515         dock->tp_enabled = false;
 516 }
 517
 518 /*** interrupt handling code ***/
 519 static void tf103c_dock_ec_cmd(struct tf103c_dock_data *dock, const u8 *cmd)
 520 {
 521         struct device *dev = &dock->ec_client->dev;
 522         int ret;
 523
 524         ret = i2c_smbus_write_i2c_block_data(dock->ec_client, TF103C_DOCK_EC_CMD_REG,
 525                                              TF103C_DOCK_EC_CMD_LEN, cmd);
 526         if (ret)
 527                 dev_err(dev, "error %d sending %*ph cmd\n", ret,
 528                         TF103C_DOCK_EC_CMD_LEN, cmd);
 529 }
 530
 531 static void tf103c_dock_sci(struct tf103c_dock_data *dock, u8 val)
 532 {
 533         struct device *dev = &dock->ec_client->dev;
 534
 535         switch (val) {
 536         case 2:
 537                 tf103c_dock_toprow_event(dock, 1, NULL);
 538                 return;
 539         case 4:
 540                 tf103c_dock_toprow_event(dock, 2, NULL);
 541                 return;
 542         case 8:
 543                 tf103c_dock_toprow_event(dock, 5, NULL);
 544                 return;
 545         case 17:
 546                 tf103c_dock_toprow_event(dock, 6, NULL);
 547                 return;
 548         }
 549
 550         dev_warn(dev, "warning unknown SCI value: 0x%02x\n", val);
 551 }
 552
 553 static void tf103c_dock_smi(struct tf103c_dock_data *dock, u8 val)
 554 {
 555         struct device *dev = &dock->ec_client->dev;
 556
 557         switch (val) {
 558         case TF103C_DOCK_SMI_EC_WAKEUP:
 559                 tf103c_dock_ec_cmd(dock, tf103c_dock_enable_cmd);
 560                 tf103c_dock_ec_cmd(dock, tf103c_dock_usb_enable_cmd);
 561                 tf103c_dock_kbd_write(dock, TF103C_DOCK_KBD_CMD_ENABLE);
 562                 break;
 563         case TF103C_DOCK_SMI_PAD_BL_CHANGE:
 564                 /* There is no backlight, but the EC still sends this */
 565                 break;
 566         case TF103C_DOCK_SMI_HID_STATUS_CHANGED:
 567                 tf103c_dock_enable_touchpad(dock);
 568                 break;
 569         default:
 570                 dev_warn(dev, "warning unknown SMI value: 0x%02x\n", val);
 571                 break;
 572         }
 573 }
 574
 575 static irqreturn_t tf103c_dock_irq(int irq, void *data)
 576 {
 577         struct tf103c_dock_data *dock = data;
 578         struct device *dev = &dock->ec_client->dev;
 579         u8 intr_data[8];
 580         int ret;
 581
 582         ret = i2c_smbus_read_i2c_block_data(dock->intr_client, TF103C_DOCK_INTR_DATA_REG,
 583                                             sizeof(intr_data), intr_data);
 584         if (ret != sizeof(intr_data)) {
 585                 dev_err(dev, "error %d reading intr data\n", ret);
 586                 return IRQ_NONE;
 587         }
 588
 589         if (!(intr_data[1] & TF103C_DOCK_INTR_DATA1_OBF_MASK))
 590                 return IRQ_NONE;
 591
 592         /* intr_data[0] is the length of the rest of the packet */
 593         if (intr_data[0] == 3 && intr_data[1] == TF103C_DOCK_INTR_DATA1_OOB_VALUE &&
 594                                  intr_data[2] == TF103C_DOCK_INTR_DATA2_OOB_VALUE) {
 595                 /* intr_data[3] seems to contain a HID input report id */
 596                 switch (intr_data[3]) {
 597                 case 0x01:
 598                         handle_nested_irq(dock->tp_irq);
 599                         break;
 600                 case 0x11:
 601                 case 0x13:
 602                 case 0x14:
 603                         tf103c_dock_kbd_interrupt(dock);
 604                         break;
 605                 default:
 606                         dev_warn(dev, "warning unknown intr_data[3]: 0x%02x\n", intr_data[3]);
 607                         break;
 608                 }
 609                 return IRQ_HANDLED;
 610         }
 611
 612         if (intr_data[1] & TF103C_DOCK_INTR_DATA1_SCI_MASK) {
 613                 tf103c_dock_sci(dock, intr_data[2]);
 614                 return IRQ_HANDLED;
 615         }
 616
 617         if (intr_data[1] & TF103C_DOCK_INTR_DATA1_SMI_MASK) {
 618                 tf103c_dock_smi(dock, intr_data[2]);
 619                 return IRQ_HANDLED;
 620         }
 621
 622         dev_warn(dev, "warning unknown intr data: %*ph\n", 8, intr_data);
 623         return IRQ_NONE;
 624 }
 625
 626 /*
 627  * tf103c_dock_[dis|en]able only run from hpd_work or at times when
 628  * hpd_work cannot run (hpd_irq disabled), so no locking is necessary.
 629  */
 630 static void tf103c_dock_enable(struct tf103c_dock_data *dock)
 631 {
 632         if (dock->enabled)
 633                 return;
 634
 635         if (dock->board_rev != 2)
 636                 gpiod_set_value(dock->pwr_en, 1);
 637
 638         msleep(500);
 639         enable_irq(dock->irq);
 640
 641         dock->enabled = true;
 642 }
 643
 644 static void tf103c_dock_disable(struct tf103c_dock_data *dock)
 645 {
 646         if (!dock->enabled)
 647                 return;
 648
 649         disable_irq(dock->irq);
 650         tf103c_dock_disable_touchpad(dock);
 651         if (dock->board_rev != 2)
 652                 gpiod_set_value(dock->pwr_en, 0);
 653
 654         dock->enabled = false;
 655 }
 656
 657 static void tf103c_dock_hpd_work(struct work_struct *work)
 658 {
 659         struct tf103c_dock_data *dock =
 660                 container_of(work, struct tf103c_dock_data, hpd_work.work);
 661
 662         if (gpiod_get_value(dock->hpd_gpio))
 663                 tf103c_dock_enable(dock);
 664         else
 665                 tf103c_dock_disable(dock);
 666 }
 667
 668 static irqreturn_t tf103c_dock_hpd_irq(int irq, void *data)
 669 {
 670         struct tf103c_dock_data *dock = data;
 671
 672         mod_delayed_work(system_long_wq, &dock->hpd_work, TF103C_DOCK_HPD_DEBOUNCE);
 673         return IRQ_HANDLED;
 674 }
 675
 676 static void tf103c_dock_start_hpd(struct tf103c_dock_data *dock)
 677 {
 678         enable_irq(dock->hpd_irq);
 679         /* Sync current HPD status */
 680         queue_delayed_work(system_long_wq, &dock->hpd_work, TF103C_DOCK_HPD_DEBOUNCE);
 681 }
 682
 683 static void tf103c_dock_stop_hpd(struct tf103c_dock_data *dock)
 684 {
 685         disable_irq(dock->hpd_irq);
 686         cancel_delayed_work_sync(&dock->hpd_work);
 687 }
 688
 689 /*** probe ***/
 690
 691 static const struct dmi_system_id tf103c_dock_dmi_ids[] = {
 692         {
 693                 .matches = {
 694                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 695                         DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
 696                 },
 697         },
 698         { }
 699 };
 700
 701 static void tf103c_dock_non_devm_cleanup(void *data)
 702 {
 703         struct tf103c_dock_data *dock = data;
 704
 705         if (dock->tp_irq_domain)
 706                 irq_domain_remove(dock->tp_irq_domain);
 707
 708         if (!IS_ERR_OR_NULL(dock->hid))
 709                 hid_destroy_device(dock->hid);
 710
 711         i2c_unregister_device(dock->kbd_client);
 712         i2c_unregister_device(dock->intr_client);
 713         gpiod_remove_lookup_table(&tf103c_dock_gpios);
 714 }
 715
 716 static int tf103c_dock_probe(struct i2c_client *client)
 717 {
 718         struct i2c_board_info board_info = { };
 719         struct device *dev = &client->dev;
 720         struct gpio_desc *board_rev_gpio;
 721         struct tf103c_dock_data *dock;
 722         enum gpiod_flags flags;
 723         int i, ret;
 724
 725         /* GPIOs are hardcoded for the Asus TF103C, don't bind on other devs */
 726         if (!dmi_check_system(tf103c_dock_dmi_ids))
 727                 return -ENODEV;
 728
 729         dock = devm_kzalloc(dev, sizeof(*dock), GFP_KERNEL);
 730         if (!dock)
 731                 return -ENOMEM;
 732
 733         INIT_DELAYED_WORK(&dock->hpd_work, tf103c_dock_hpd_work);
 734
 735         /* 1. Get GPIOs and their IRQs */
 736         gpiod_add_lookup_table(&tf103c_dock_gpios);
 737
 738         ret = devm_add_action_or_reset(dev, tf103c_dock_non_devm_cleanup, dock);
 739         if (ret)
 740                 return ret;
 741
 742         /*
 743          * The pin is configured as input by default, use ASIS because otherwise
 744          * the gpio-crystalcove.c switches off the internal pull-down replacing
 745          * it with a pull-up.
 746          */
 747         board_rev_gpio = gpiod_get(dev, "board_rev", GPIOD_ASIS);
 748         if (IS_ERR(board_rev_gpio))
 749                 return dev_err_probe(dev, PTR_ERR(board_rev_gpio), "requesting board_rev GPIO\n");
 750         dock->board_rev = gpiod_get_value_cansleep(board_rev_gpio) + 1;
 751         gpiod_put(board_rev_gpio);
 752
 753         /*
 754          * The Android driver drives the dock-pwr-en pin high at probe for
 755          * revision 2 boards and then never touches it again?
 756          * This code has only been tested on a revision 1 board, so for now
 757          * just mimick what Android does on revision 2 boards.
 758          */
 759         flags = (dock->board_rev == 2) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
 760         dock->pwr_en = devm_gpiod_get(dev, "dock_pwr_en", flags);
 761         if (IS_ERR(dock->pwr_en))
 762                 return dev_err_probe(dev, PTR_ERR(dock->pwr_en), "requesting pwr_en GPIO\n");
 763
 764         dock->irq_gpio = devm_gpiod_get(dev, "dock_irq", GPIOD_IN);
 765         if (IS_ERR(dock->irq_gpio))
 766                 return dev_err_probe(dev, PTR_ERR(dock->irq_gpio), "requesting IRQ GPIO\n");
 767
 768         dock->irq = gpiod_to_irq(dock->irq_gpio);
 769         if (dock->irq < 0)
 770                 return dev_err_probe(dev, dock->irq, "getting dock IRQ");
 771
 772         ret = devm_request_threaded_irq(dev, dock->irq, NULL, tf103c_dock_irq,
 773                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_NO_AUTOEN,
 774                                         "dock_irq", dock);
 775         if (ret)
 776                 return dev_err_probe(dev, ret, "requesting dock IRQ");
 777
 778         dock->hpd_gpio = devm_gpiod_get(dev, "dock_hpd", GPIOD_IN);
 779         if (IS_ERR(dock->hpd_gpio))
 780                 return dev_err_probe(dev, PTR_ERR(dock->hpd_gpio), "requesting HPD GPIO\n");
 781
 782         dock->hpd_irq = gpiod_to_irq(dock->hpd_gpio);
 783         if (dock->hpd_irq < 0)
 784                 return dev_err_probe(dev, dock->hpd_irq, "getting HPD IRQ");
 785
 786         ret = devm_request_irq(dev, dock->hpd_irq, tf103c_dock_hpd_irq,
 787                                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_NO_AUTOEN,
 788                                "dock_hpd", dock);
 789         if (ret)
 790                 return ret;
 791
 792         /*
 793          * 2. Create I2C clients. The dock uses 4 different i2c addresses,
 794          * the ACPI NPCE69A node being probed points to the EC address.
 795          */
 796         dock->ec_client = client;
 797
 798         strscpy(board_info.type, "tf103c-dock-intr", I2C_NAME_SIZE);
 799         board_info.addr = TF103C_DOCK_INTR_ADDR;
 800         board_info.dev_name = TF103C_DOCK_DEV_NAME "-intr";
 801
 802         dock->intr_client = i2c_new_client_device(client->adapter, &board_info);
 803         if (IS_ERR(dock->intr_client))
 804                 return dev_err_probe(dev, PTR_ERR(dock->intr_client), "creating intr client\n");
 805
 806         strscpy(board_info.type, "tf103c-dock-kbd", I2C_NAME_SIZE);
 807         board_info.addr = TF103C_DOCK_KBD_ADDR;
 808         board_info.dev_name = TF103C_DOCK_DEV_NAME "-kbd";
 809
 810         dock->kbd_client = i2c_new_client_device(client->adapter, &board_info);
 811         if (IS_ERR(dock->kbd_client))
 812                 return dev_err_probe(dev, PTR_ERR(dock->kbd_client), "creating kbd client\n");
 813
 814         /* 3. Create input_dev for the top row of the keyboard */
 815         dock->input = devm_input_allocate_device(dev);
 816         if (!dock->input)
 817                 return -ENOMEM;
 818
 819         dock->input->name = "Asus TF103C Dock Top Row Keys";
 820         dock->input->phys = dev_name(dev);
 821         dock->input->dev.parent = dev;
 822         dock->input->id.bustype = BUS_I2C;
 823         dock->input->id.vendor = /* USB_VENDOR_ID_ASUSTEK */
 824         dock->input->id.product = /* From TF-103-C */
 825         dock->input->id.version = 0x0100;  /* 1.0 */
 826
 827         for (i = 0; i < ARRAY_SIZE(tf103c_dock_toprow_codes); i++) {
 828                 input_set_capability(dock->input, EV_KEY, tf103c_dock_toprow_codes[i][0]);
 829                 input_set_capability(dock->input, EV_KEY, tf103c_dock_toprow_codes[i][1]);
 830         }
 831         input_set_capability(dock->input, EV_KEY, KEY_RIGHTALT);
 832
 833         ret = input_register_device(dock->input);
 834         if (ret)
 835                 return ret;
 836
 837         /* 4. Create HID device for the keyboard */
 838         dock->hid = hid_allocate_device();
 839         if (IS_ERR(dock->hid))
 840                 return dev_err_probe(dev, PTR_ERR(dock->hid), "allocating hid dev\n");
 841
 842         dock->hid->driver_data = dock;
 843         dock->hid->ll_driver = &tf103c_dock_hid_ll_driver;
 844         dock->hid->dev.parent = &client->dev;
 845         dock->hid->bus = BUS_I2C;
 846         dock->hid->vendor = 0x0b05;  /* USB_VENDOR_ID_ASUSTEK */
 847         dock->hid->product = 0x0103; /* From TF-103-C */
 848         dock->hid->version = 0x0100; /* 1.0 */
 849         strscpy(dock->hid->name, "Asus TF103C Dock Keyboard", sizeof(dock->hid->name));
 850         strscpy(dock->hid->phys, dev_name(dev), sizeof(dock->hid->phys));
 851
 852         ret = hid_add_device(dock->hid);
 853         if (ret)
 854                 return dev_err_probe(dev, ret, "adding hid dev\n");
 855
 856         /* 5. Setup irqchip for touchpad IRQ pass-through */
 857         dock->tp_irqchip.name = KBUILD_MODNAME;
 858
 859         dock->tp_irq_domain = irq_domain_add_linear(NULL, 1, &irq_domain_simple_ops, NULL);
 860         if (!dock->tp_irq_domain)
 861                 return -ENOMEM;
 862
 863         dock->tp_irq = irq_create_mapping(dock->tp_irq_domain, 0);
 864         if (!dock->tp_irq)
 865                 return -ENOMEM;
 866
 867         irq_set_chip_data(dock->tp_irq, dock);
 868         irq_set_chip_and_handler(dock->tp_irq, &dock->tp_irqchip, handle_simple_irq);
 869         irq_set_nested_thread(dock->tp_irq, true);
 870         irq_set_noprobe(dock->tp_irq);
 871
 872         dev_info(dev, "Asus TF103C board-revision: %d\n", dock->board_rev);
 873
 874         tf103c_dock_start_hpd(dock);
 875
 876         device_init_wakeup(dev, true);
 877         i2c_set_clientdata(client, dock);
 878         return 0;
 879 }
 880
 881 static int tf103c_dock_remove(struct i2c_client *client)
 882 {
 883         struct tf103c_dock_data *dock = i2c_get_clientdata(client);
 884
 885         tf103c_dock_stop_hpd(dock);
 886         tf103c_dock_disable(dock);
 887
 888         return 0;
 889 }
 890
 891 static int __maybe_unused tf103c_dock_suspend(struct device *dev)
 892 {
 893         struct tf103c_dock_data *dock = dev_get_drvdata(dev);
 894
 895         tf103c_dock_stop_hpd(dock);
 896
 897         if (dock->enabled) {
 898                 tf103c_dock_ec_cmd(dock, tf103c_dock_suspend_cmd);
 899
 900                 if (device_may_wakeup(dev))
 901                         enable_irq_wake(dock->irq);
 902         }
 903
 904         return 0;
 905 }
 906
 907 static int __maybe_unused tf103c_dock_resume(struct device *dev)
 908 {
 909         struct tf103c_dock_data *dock = dev_get_drvdata(dev);
 910
 911         if (dock->enabled) {
 912                 if (device_may_wakeup(dev))
 913                         disable_irq_wake(dock->irq);
 914
 915                 /* Don't try to resume if the dock was unplugged during suspend */
 916                 if (gpiod_get_value(dock->hpd_gpio))
 917                         tf103c_dock_ec_cmd(dock, tf103c_dock_enable_cmd);
 918         }
 919
 920         tf103c_dock_start_hpd(dock);
 921         return 0;
 922 }
 923
 924 static SIMPLE_DEV_PM_OPS(tf103c_dock_pm_ops, tf103c_dock_suspend, tf103c_dock_resume);
 925
 926 static const struct acpi_device_id tf103c_dock_acpi_match[] = {
 927         {"NPCE69A"},
 928         { }
 929 };
 930 MODULE_DEVICE_TABLE(acpi, tf103c_dock_acpi_match);
 931
 932 static struct i2c_driver tf103c_dock_driver = {
 933         .driver = {
 934                 .name = "asus-tf103c-dock",
 935                 .pm = &tf103c_dock_pm_ops,
 936                 .acpi_match_table = tf103c_dock_acpi_match,
 937         },
 938         .probe_new = tf103c_dock_probe,
 939         .remove = tf103c_dock_remove,
 940 };
 941 module_i2c_driver(tf103c_dock_driver);
 942
 943 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");
 944 MODULE_DESCRIPTION("X86 Android tablets DSDT fixups driver");
 945 MODULE_LICENSE("GPL");