drivers/platform/x86/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/module.h>
  27
  28 #define ATMEL_TP_I2C_ADDR       0x4b
  29 #define ATMEL_TP_I2C_BL_ADDR    0x25
  30 #define ATMEL_TS_I2C_ADDR       0x4a
  31 #define ATMEL_TS_I2C_BL_ADDR    0x26
  32 #define CYAPA_TP_I2C_ADDR       0x67
  33 #define ISL_ALS_I2C_ADDR        0x44
  34 #define TAOS_ALS_I2C_ADDR       0x29
  35
  36 static struct i2c_client *als;
  37 static struct i2c_client *tp;
  38 static struct i2c_client *ts;
  39
  40 const char *i2c_adapter_names[] = {
  41         "SMBus I801 adapter",
  42 };
  43
  44 /* Keep this enum consistent with i2c_adapter_names */
  45 enum i2c_adapter_type {
  46         I2C_ADAPTER_SMBUS = 0,
  47 };
  48
  49 static struct i2c_board_info __initdata cyapa_device = {
  50         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
  51         .flags          = I2C_CLIENT_WAKE,
  52 };
  53
  54 static struct i2c_board_info __initdata isl_als_device = {
  55         I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
  56 };
  57
  58 static struct i2c_board_info __initdata tsl2583_als_device = {
  59         I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
  60 };
  61
  62 static struct i2c_board_info __initdata tsl2563_als_device = {
  63         I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
  64 };
  65
  66 static struct i2c_board_info __initdata atmel_224s_tp_device = {
  67         I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
  68         .platform_data = NULL,
  69         .flags          = I2C_CLIENT_WAKE,
  70 };
  71
  72 static struct i2c_board_info __initdata atmel_1664s_device = {
  73         I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
  74         .platform_data = NULL,
  75         .flags          = I2C_CLIENT_WAKE,
  76 };
  77
  78 static struct i2c_client __init *__add_probed_i2c_device(
  79                 const char *name,
  80                 int bus,
  81                 struct i2c_board_info *info,
  82                 const unsigned short *addrs)
  83 {
  84         const struct dmi_device *dmi_dev;
  85         const struct dmi_dev_onboard *dev_data;
  86         struct i2c_adapter *adapter;
  87         struct i2c_client *client;
  88
  89         if (bus < 0)
  90                 return NULL;
  91         /*
  92          * If a name is specified, look for irq platform information stashed
  93          * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
  94          */
  95         if (name) {
  96                 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
  97                 if (!dmi_dev) {
  98                         pr_err("%s failed to dmi find device %s.\n",
  99                                __func__,
 100                                name);
 101                         return NULL;
 102                 }
 103                 dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
 104                 if (!dev_data) {
 105                         pr_err("%s failed to get data from dmi for %s.\n",
 106                                __func__, name);
 107                         return NULL;
 108                 }
 109                 info->irq = dev_data->instance;
 110         }
 111
 112         adapter = i2c_get_adapter(bus);
 113         if (!adapter) {
 114                 pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
 115                 return NULL;
 116         }
 117
 118         /* add the i2c device */
 119         client = i2c_new_probed_device(adapter, info, addrs, NULL);
 120         if (!client)
 121                 pr_err("%s failed to register device %d-%02x\n",
 122                        __func__, bus, info->addr);
 123         else
 124                 pr_debug("%s added i2c device %d-%02x\n",
 125                          __func__, bus, info->addr);
 126
 127         i2c_put_adapter(adapter);
 128         return client;
 129 }
 130
 131 static int __init __find_i2c_adap(struct device *dev, void *data)
 132 {
 133         const char *name = data;
 134         static const char *prefix = "i2c-";
 135         struct i2c_adapter *adapter;
 136         if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
 137                 return 0;
 138         adapter = to_i2c_adapter(dev);
 139         return (strncmp(adapter->name, name, strlen(name)) == 0);
 140 }
 141
 142 static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
 143 {
 144         struct device *dev = NULL;
 145         struct i2c_adapter *adapter;
 146         const char *name = i2c_adapter_names[type];
 147         /* find the adapter by name */
 148         dev = bus_find_device(&i2c_bus_type, NULL, (void *)name,
 149                               __find_i2c_adap);
 150         if (!dev) {
 151                 pr_err("%s: i2c adapter %s not found on system.\n", __func__,
 152                        name);
 153                 return -ENODEV;
 154         }
 155         adapter = to_i2c_adapter(dev);
 156         return adapter->nr;
 157 }
 158
 159 /*
 160  * Takes a list of addresses in addrs as such :
 161  * { addr1, ... , addrn, I2C_CLIENT_END };
 162  * add_probed_i2c_device will use i2c_new_probed_device
 163  * and probe for devices at all of the addresses listed.
 164  * Returns NULL if no devices found.
 165  * See Documentation/i2c/instantiating-devices for more information.
 166  */
 167 static __init struct i2c_client *add_probed_i2c_device(
 168                 const char *name,
 169                 enum i2c_adapter_type type,
 170                 struct i2c_board_info *info,
 171                 const unsigned short *addrs)
 172 {
 173         return __add_probed_i2c_device(name,
 174                                        find_i2c_adapter_num(type),
 175                                        info,
 176                                        addrs);
 177 }
 178
 179 /*
 180  * Probes for a device at a single address, the one provided by
 181  * info->addr.
 182  * Returns NULL if no device found.
 183  */
 184 static struct i2c_client __init *add_smbus_device(const char *name,
 185                                                   struct i2c_board_info *info)
 186 {
 187         const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
 188         return __add_probed_i2c_device(name,
 189                                        find_i2c_adapter_num(I2C_ADAPTER_SMBUS),
 190                                        info,
 191                                        addr_list);
 192 }
 193
 194 static int __init setup_cyapa_smbus_tp(const struct dmi_system_id *id)
 195 {
 196         /* add cyapa touchpad on smbus */
 197         tp = add_smbus_device("trackpad", &cyapa_device);
 198         return 0;
 199 }
 200
 201 static int __init setup_atmel_224s_tp(const struct dmi_system_id *id)
 202 {
 203         const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
 204                                              ATMEL_TP_I2C_ADDR,
 205                                              I2C_CLIENT_END };
 206
 207         /* add atmel mxt touchpad on VGA DDC GMBus */
 208         tp = add_probed_i2c_device("trackpad", I2C_ADAPTER_VGADDC,
 209                                    &atmel_224s_tp_device, addr_list);
 210         return 0;
 211 }
 212
 213 static int __init setup_atmel_1664s_ts(const struct dmi_system_id *id)
 214 {
 215         const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
 216                                              ATMEL_TS_I2C_ADDR,
 217                                              I2C_CLIENT_END };
 218
 219         /* add atmel mxt touch device on PANEL GMBus */
 220         ts = add_probed_i2c_device("touchscreen", I2C_ADAPTER_PANEL,
 221                                    &atmel_1664s_device, addr_list);
 222         return 0;
 223 }
 224
 225
 226 static int __init setup_isl29018_als(const struct dmi_system_id *id)
 227 {
 228         /* add isl29018 light sensor */
 229         als = add_smbus_device("lightsensor", &isl_als_device);
 230         return 0;
 231 }
 232
 233 static int __init setup_tsl2583_als(const struct dmi_system_id *id)
 234 {
 235         /* add tsl2583 light sensor on smbus */
 236         als = add_smbus_device(NULL, &tsl2583_als_device);
 237         return 0;
 238 }
 239
 240 static int __init setup_tsl2563_als(const struct dmi_system_id *id)
 241 {
 242         /* add tsl2563 light sensor on smbus */
 243         als = add_smbus_device(NULL, &tsl2563_als_device);
 244         return 0;
 245 }
 246
 247 static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = {
 248         {
 249                 .ident = "Samsung Series 5 550 - Touchpad",
 250                 .matches = {
 251                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 252                         DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
 253                 },
 254                 .callback = setup_cyapa_smbus_tp,
 255         },
 256         {
 257                 .ident = "Chromebook Pixel - Touchscreen",
 258                 .matches = {
 259                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 260                         DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 261                 },
 262                 .callback = setup_atmel_1664s_ts,
 263         },
 264         {
 265                 .ident = "Chromebook Pixel - Touchpad",
 266                 .matches = {
 267                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 268                         DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 269                 },
 270                 .callback = setup_atmel_224s_tp,
 271         },
 272         {
 273                 .ident = "Samsung Series 5 550 - Light Sensor",
 274                 .matches = {
 275                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 276                         DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
 277                 },
 278                 .callback = setup_isl29018_als,
 279         },
 280         {
 281                 .ident = "Acer C7 Chromebook - Touchpad",
 282                 .matches = {
 283                         DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
 284                 },
 285                 .callback = setup_cyapa_smbus_tp,
 286         },
 287         {
 288                 .ident = "HP Pavilion 14 Chromebook - Touchpad",
 289                 .matches = {
 290                         DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
 291                 },
 292                 .callback = setup_cyapa_smbus_tp,
 293         },
 294         {
 295                 .ident = "Samsung Series 5 - Light Sensor",
 296                 .matches = {
 297                         DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
 298                 },
 299                 .callback = setup_tsl2583_als,
 300         },
 301         {
 302                 .ident = "Cr-48 - Light Sensor",
 303                 .matches = {
 304                         DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
 305                 },
 306                 .callback = setup_tsl2563_als,
 307         },
 308         {
 309                 .ident = "Acer AC700 - Light Sensor",
 310                 .matches = {
 311                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 312                 },
 313                 .callback = setup_tsl2563_als,
 314         },
 315         { }
 316 };
 317 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
 318
 319 static int __init chromeos_laptop_init(void)
 320 {
 321         if (!dmi_check_system(chromeos_laptop_dmi_table)) {
 322                 pr_debug("%s unsupported system.\n", __func__);
 323                 return -ENODEV;
 324         }
 325         return 0;
 326 }
 327
 328 static void __exit chromeos_laptop_exit(void)
 329 {
 330         if (als)
 331                 i2c_unregister_device(als);
 332         if (tp)
 333                 i2c_unregister_device(tp);
 334         if (ts)
 335                 i2c_unregister_device(ts);
 336 }
 337
 338 module_init(chromeos_laptop_init);
 339 module_exit(chromeos_laptop_exit);
 340
 341 MODULE_DESCRIPTION("Chrome OS Laptop driver");
 342 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
 343 MODULE_LICENSE("GPL");