drivers/platform/chrome/chromeos_laptop.c

   1 /*
   2  *  chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
   3  *
   4  *  Author : Benson Leung <bleung@chromium.org>
   5  *
   6  *  Copyright (C) 2012 Google, Inc.
   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 as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/dmi.h>
  25 #include <linux/i2c.h>
  26 #include <linux/i2c/atmel_mxt_ts.h>
  27 #include <linux/input.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/module.h>
  30
  31 #define ATMEL_TP_I2C_ADDR       0x4b
  32 #define ATMEL_TP_I2C_BL_ADDR    0x25
  33 #define ATMEL_TS_I2C_ADDR       0x4a
  34 #define ATMEL_TS_I2C_BL_ADDR    0x26
  35 #define CYAPA_TP_I2C_ADDR       0x67
  36 #define ISL_ALS_I2C_ADDR        0x44
  37 #define TAOS_ALS_I2C_ADDR       0x29
  38
  39 static struct i2c_client *als;
  40 static struct i2c_client *tp;
  41 static struct i2c_client *ts;
  42
  43 const char *i2c_adapter_names[] = {
  44         "SMBus I801 adapter",
  45         "i915 gmbus vga",
  46         "i915 gmbus panel",
  47 };
  48
  49 /* Keep this enum consistent with i2c_adapter_names */
  50 enum i2c_adapter_type {
  51         I2C_ADAPTER_SMBUS = 0,
  52         I2C_ADAPTER_VGADDC,
  53         I2C_ADAPTER_PANEL,
  54 };
  55
  56 static struct i2c_board_info __initdata cyapa_device = {
  57         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
  58         .flags          = I2C_CLIENT_WAKE,
  59 };
  60
  61 static struct i2c_board_info __initdata isl_als_device = {
  62         I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
  63 };
  64
  65 static struct i2c_board_info __initdata tsl2583_als_device = {
  66         I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
  67 };
  68
  69 static struct i2c_board_info __initdata tsl2563_als_device = {
  70         I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
  71 };
  72
  73 static struct mxt_platform_data atmel_224s_tp_platform_data = {
  74         .x_line                 = 18,
  75         .y_line                 = 12,
  76         .x_size                 = 102*20,
  77         .y_size                 = 68*20,
  78         .blen                   = 0x80, /* Gain setting is in upper 4 bits */
  79         .threshold              = 0x32,
  80         .voltage                = 0,    /* 3.3V */
  81         .orient                 = MXT_VERTICAL_FLIP,
  82         .irqflags               = IRQF_TRIGGER_FALLING,
  83         .is_tp                  = true,
  84         .key_map                = { KEY_RESERVED,
  85                                     KEY_RESERVED,
  86                                     KEY_RESERVED,
  87                                     BTN_LEFT },
  88         .config                 = NULL,
  89         .config_length          = 0,
  90 };
  91
  92 static struct i2c_board_info __initdata atmel_224s_tp_device = {
  93         I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
  94         .platform_data = &atmel_224s_tp_platform_data,
  95         .flags          = I2C_CLIENT_WAKE,
  96 };
  97
  98 static struct mxt_platform_data atmel_1664s_platform_data = {
  99         .x_line                 = 32,
 100         .y_line                 = 50,
 101         .x_size                 = 1700,
 102         .y_size                 = 2560,
 103         .blen                   = 0x89, /* Gain setting is in upper 4 bits */
 104         .threshold              = 0x28,
 105         .voltage                = 0,    /* 3.3V */
 106         .orient                 = MXT_ROTATED_90_COUNTER,
 107         .irqflags               = IRQF_TRIGGER_FALLING,
 108         .is_tp                  = false,
 109         .config                 = NULL,
 110         .config_length          = 0,
 111 };
 112
 113 static struct i2c_board_info __initdata atmel_1664s_device = {
 114         I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
 115         .platform_data = &atmel_1664s_platform_data,
 116         .flags          = I2C_CLIENT_WAKE,
 117 };
 118
 119 static struct i2c_client __init *__add_probed_i2c_device(
 120                 const char *name,
 121                 int bus,
 122                 struct i2c_board_info *info,
 123                 const unsigned short *addrs)
 124 {
 125         const struct dmi_device *dmi_dev;
 126         const struct dmi_dev_onboard *dev_data;
 127         struct i2c_adapter *adapter;
 128         struct i2c_client *client;
 129
 130         if (bus < 0)
 131                 return NULL;
 132         /*
 133          * If a name is specified, look for irq platform information stashed
 134          * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
 135          */
 136         if (name) {
 137                 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
 138                 if (!dmi_dev) {
 139                         pr_err("%s failed to dmi find device %s.\n",
 140                                __func__,
 141                                name);
 142                         return NULL;
 143                 }
 144                 dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
 145                 if (!dev_data) {
 146                         pr_err("%s failed to get data from dmi for %s.\n",
 147                                __func__, name);
 148                         return NULL;
 149                 }
 150                 info->irq = dev_data->instance;
 151         }
 152
 153         adapter = i2c_get_adapter(bus);
 154         if (!adapter) {
 155                 pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
 156                 return NULL;
 157         }
 158
 159         /* add the i2c device */
 160         client = i2c_new_probed_device(adapter, info, addrs, NULL);
 161         if (!client)
 162                 pr_err("%s failed to register device %d-%02x\n",
 163                        __func__, bus, info->addr);
 164         else
 165                 pr_debug("%s added i2c device %d-%02x\n",
 166                          __func__, bus, info->addr);
 167
 168         i2c_put_adapter(adapter);
 169         return client;
 170 }
 171
 172 static int __init __find_i2c_adap(struct device *dev, void *data)
 173 {
 174         const char *name = data;
 175         static const char *prefix = "i2c-";
 176         struct i2c_adapter *adapter;
 177         if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
 178                 return 0;
 179         adapter = to_i2c_adapter(dev);
 180         return (strncmp(adapter->name, name, strlen(name)) == 0);
 181 }
 182
 183 static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
 184 {
 185         struct device *dev = NULL;
 186         struct i2c_adapter *adapter;
 187         const char *name = i2c_adapter_names[type];
 188         /* find the adapter by name */
 189         dev = bus_find_device(&i2c_bus_type, NULL, (void *)name,
 190                               __find_i2c_adap);
 191         if (!dev) {
 192                 pr_err("%s: i2c adapter %s not found on system.\n", __func__,
 193                        name);
 194                 return -ENODEV;
 195         }
 196         adapter = to_i2c_adapter(dev);
 197         return adapter->nr;
 198 }
 199
 200 /*
 201  * Takes a list of addresses in addrs as such :
 202  * { addr1, ... , addrn, I2C_CLIENT_END };
 203  * add_probed_i2c_device will use i2c_new_probed_device
 204  * and probe for devices at all of the addresses listed.
 205  * Returns NULL if no devices found.
 206  * See Documentation/i2c/instantiating-devices for more information.
 207  */
 208 static __init struct i2c_client *add_probed_i2c_device(
 209                 const char *name,
 210                 enum i2c_adapter_type type,
 211                 struct i2c_board_info *info,
 212                 const unsigned short *addrs)
 213 {
 214         return __add_probed_i2c_device(name,
 215                                        find_i2c_adapter_num(type),
 216                                        info,
 217                                        addrs);
 218 }
 219
 220 /*
 221  * Probes for a device at a single address, the one provided by
 222  * info->addr.
 223  * Returns NULL if no device found.
 224  */
 225 static __init struct i2c_client *add_i2c_device(const char *name,
 226                                                 enum i2c_adapter_type type,
 227                                                 struct i2c_board_info *info)
 228 {
 229         const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
 230         return __add_probed_i2c_device(name,
 231                                        find_i2c_adapter_num(type),
 232                                        info,
 233                                        addr_list);
 234 }
 235
 236
 237 static struct i2c_client __init *add_smbus_device(const char *name,
 238                                                   struct i2c_board_info *info)
 239 {
 240         return add_i2c_device(name, I2C_ADAPTER_SMBUS, info);
 241 }
 242
 243 static int __init setup_cyapa_smbus_tp(const struct dmi_system_id *id)
 244 {
 245         /* add cyapa touchpad on smbus */
 246         tp = add_smbus_device("trackpad", &cyapa_device);
 247         return 0;
 248 }
 249
 250 static int __init setup_atmel_224s_tp(const struct dmi_system_id *id)
 251 {
 252         const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
 253                                              ATMEL_TP_I2C_ADDR,
 254                                              I2C_CLIENT_END };
 255
 256         /* add atmel mxt touchpad on VGA DDC GMBus */
 257         tp = add_probed_i2c_device("trackpad", I2C_ADAPTER_VGADDC,
 258                                    &atmel_224s_tp_device, addr_list);
 259         return 0;
 260 }
 261
 262 static int __init setup_atmel_1664s_ts(const struct dmi_system_id *id)
 263 {
 264         const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
 265                                              ATMEL_TS_I2C_ADDR,
 266                                              I2C_CLIENT_END };
 267
 268         /* add atmel mxt touch device on PANEL GMBus */
 269         ts = add_probed_i2c_device("touchscreen", I2C_ADAPTER_PANEL,
 270                                    &atmel_1664s_device, addr_list);
 271         return 0;
 272 }
 273
 274
 275 static int __init setup_isl29018_als(const struct dmi_system_id *id)
 276 {
 277         /* add isl29018 light sensor */
 278         als = add_smbus_device("lightsensor", &isl_als_device);
 279         return 0;
 280 }
 281
 282 static int __init setup_isl29023_als(const struct dmi_system_id *id)
 283 {
 284         /* add isl29023 light sensor on Panel GMBus */
 285         als = add_i2c_device("lightsensor", I2C_ADAPTER_PANEL,
 286                              &isl_als_device);
 287         return 0;
 288 }
 289
 290 static int __init setup_tsl2583_als(const struct dmi_system_id *id)
 291 {
 292         /* add tsl2583 light sensor on smbus */
 293         als = add_smbus_device(NULL, &tsl2583_als_device);
 294         return 0;
 295 }
 296
 297 static int __init setup_tsl2563_als(const struct dmi_system_id *id)
 298 {
 299         /* add tsl2563 light sensor on smbus */
 300         als = add_smbus_device(NULL, &tsl2563_als_device);
 301         return 0;
 302 }
 303
 304 static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = {
 305         {
 306                 .ident = "Samsung Series 5 550 - Touchpad",
 307                 .matches = {
 308                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 309                         DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
 310                 },
 311                 .callback = setup_cyapa_smbus_tp,
 312         },
 313         {
 314                 .ident = "Chromebook Pixel - Touchscreen",
 315                 .matches = {
 316                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 317                         DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 318                 },
 319                 .callback = setup_atmel_1664s_ts,
 320         },
 321         {
 322                 .ident = "Chromebook Pixel - Touchpad",
 323                 .matches = {
 324                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 325                         DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 326                 },
 327                 .callback = setup_atmel_224s_tp,
 328         },
 329         {
 330                 .ident = "Samsung Series 5 550 - Light Sensor",
 331                 .matches = {
 332                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 333                         DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
 334                 },
 335                 .callback = setup_isl29018_als,
 336         },
 337         {
 338                 .ident = "Chromebook Pixel - Light Sensor",
 339                 .matches = {
 340                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 341                         DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 342                 },
 343                 .callback = setup_isl29023_als,
 344         },
 345         {
 346                 .ident = "Acer C7 Chromebook - Touchpad",
 347                 .matches = {
 348                         DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
 349                 },
 350                 .callback = setup_cyapa_smbus_tp,
 351         },
 352         {
 353                 .ident = "HP Pavilion 14 Chromebook - Touchpad",
 354                 .matches = {
 355                         DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
 356                 },
 357                 .callback = setup_cyapa_smbus_tp,
 358         },
 359         {
 360                 .ident = "Samsung Series 5 - Light Sensor",
 361                 .matches = {
 362                         DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
 363                 },
 364                 .callback = setup_tsl2583_als,
 365         },
 366         {
 367                 .ident = "Cr-48 - Light Sensor",
 368                 .matches = {
 369                         DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
 370                 },
 371                 .callback = setup_tsl2563_als,
 372         },
 373         {
 374                 .ident = "Acer AC700 - Light Sensor",
 375                 .matches = {
 376                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 377                 },
 378                 .callback = setup_tsl2563_als,
 379         },
 380         { }
 381 };
 382 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
 383
 384 static int __init chromeos_laptop_init(void)
 385 {
 386         if (!dmi_check_system(chromeos_laptop_dmi_table)) {
 387                 pr_debug("%s unsupported system.\n", __func__);
 388                 return -ENODEV;
 389         }
 390         return 0;
 391 }
 392
 393 static void __exit chromeos_laptop_exit(void)
 394 {
 395         if (als)
 396                 i2c_unregister_device(als);
 397         if (tp)
 398                 i2c_unregister_device(tp);
 399         if (ts)
 400                 i2c_unregister_device(ts);
 401 }
 402
 403 module_init(chromeos_laptop_init);
 404 module_exit(chromeos_laptop_exit);
 405
 406 MODULE_DESCRIPTION("Chrome OS Laptop driver");
 407 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
 408 MODULE_LICENSE("GPL");