target/linux/xburst/patches-2.6.36/800-n516-lpc.patch

   1 From b3c2e7322c09f0ce2f7ba89b7c6fceb6e00c2da0 Mon Sep 17 00:00:00 2001
   2 From: Lars-Peter Clausen <lars@metafoo.de>
   3 Date: Wed, 12 May 2010 14:22:36 +0200
   4 Subject: [PATCH] Add n516 lpc driver
   5
   6 ---
   7  drivers/misc/Kconfig    |    8 +
   8  drivers/misc/Makefile   |    1 +
   9  drivers/misc/n516-lpc.c |  471 +++++++++++++++++++++++++++++++++++++++++++++++
  10  3 files changed, 480 insertions(+), 0 deletions(-)
  11  create mode 100644 drivers/misc/n516-lpc.c
  12
  13 --- a/drivers/misc/Kconfig
  14 +++ b/drivers/misc/Kconfig
  15 @@ -390,6 +390,14 @@ config BMP085
  16           To compile this driver as a module, choose M here: the
  17           module will be called bmp085.
  18
  19 +config N516_LPC
  20 +       tristate "N516 keys & power controller"
  21 +       depends on I2C
  22 +       depends on INPUT
  23 +       depends on POWER_SUPPLY
  24 +       help
  25 +         N516 keyboard & power controller driver
  26 +
  27  source "drivers/misc/c2port/Kconfig"
  28  source "drivers/misc/eeprom/Kconfig"
  29  source "drivers/misc/cb710/Kconfig"
  30 --- a/drivers/misc/Makefile
  31 +++ b/drivers/misc/Makefile
  32 @@ -35,3 +35,4 @@ obj-y                         += eeprom/
  33  obj-y                          += cb710/
  34  obj-$(CONFIG_VMWARE_BALLOON)   += vmw_balloon.o
  35  obj-$(CONFIG_ARM_CHARLCD)      += arm-charlcd.o
  36 +obj-$(CONFIG_N516_LPC)         += n516-lpc.o
  37 --- /dev/null
  38 +++ b/drivers/misc/n516-lpc.c
  39 @@ -0,0 +1,471 @@
  40 +#include <linux/module.h>
  41 +#include <linux/version.h>
  42 +#include <linux/init.h>
  43 +#include <linux/fs.h>
  44 +#include <linux/interrupt.h>
  45 +#include <linux/irq.h>
  46 +#include <linux/sched.h>
  47 +#include <linux/pm.h>
  48 +#include <linux/sysctl.h>
  49 +#include <linux/proc_fs.h>
  50 +#include <linux/delay.h>
  51 +#include <linux/platform_device.h>
  52 +#include <linux/input.h>
  53 +#include <linux/power_supply.h>
  54 +#include <linux/suspend.h>
  55 +
  56 +#include <linux/i2c.h>
  57 +
  58 +#include <asm/mach-jz4740/irq.h>
  59 +#include <asm/mach-jz4740/gpio.h>
  60 +#include <asm/mach-jz4740/board-n516.h>
  61 +
  62 +static int batt_level=0;
  63 +module_param(batt_level, int, 0);
  64 +
  65 +struct n516_lpc_chip {
  66 +       struct i2c_client       *i2c_client;
  67 +       struct input_dev        *input;
  68 +       unsigned int            battery_level;
  69 +       unsigned int            suspending:1, can_sleep:1;
  70 +};
  71 +
  72 +static struct n516_lpc_chip *the_lpc;
  73 +
  74 +struct i2c_device_id n516_lpc_i2c_ids[] = {
  75 +       {"LPC524", 0},
  76 +       {},
  77 +};
  78 +
  79 +MODULE_DEVICE_TABLE(i2c, n516_lpc_i2c_ids);
  80 +
  81 +static const unsigned short normal_i2c[] = I2C_ADDRS(0x54);
  82 +
  83 +static const unsigned int n516_lpc_keymap[] = {
  84 +       [0x01] = KEY_4,
  85 +       [0x02] = KEY_3,
  86 +       [0x03] = KEY_2,
  87 +       [0x04] = KEY_1,
  88 +       [0x05] = KEY_0,
  89 +       [0x07] = KEY_9,
  90 +       [0x08] = KEY_8,
  91 +       [0x09] = KEY_7,
  92 +       [0x0a] = KEY_6,
  93 +       [0x0b] = KEY_5,
  94 +       [0x0d] = KEY_PLAYPAUSE,
  95 +       [0x0e] = KEY_MENU,
  96 +       [0x0f] = KEY_SEARCH,
  97 +       [0x10] = KEY_DIRECTION,
  98 +       [0x11] = KEY_SPACE,
  99 +       [0x13] = KEY_ENTER,
 100 +       [0x14] = KEY_UP,
 101 +       [0x15] = KEY_DOWN,
 102 +       [0x16] = KEY_RIGHT,
 103 +       [0x17] = KEY_LEFT,
 104 +       [0x19] = KEY_PAGEDOWN,
 105 +       [0x1a] = KEY_PAGEUP,
 106 +       [0x1c] = KEY_POWER,
 107 +       [0x1d] = KEY_ESC,
 108 +       [0x1e] = KEY_SLEEP,
 109 +       [0x1f] = KEY_WAKEUP,
 110 +};
 111 +
 112 +static const unsigned int batt_charge[] = {0, 7, 20, 45, 65, 80, 100};
 113 +#define MAX_BAT_LEVEL  6
 114 +
 115 +static inline int n516_bat_charging(void)
 116 +{
 117 +       return !gpio_get_value(GPIO_CHARG_STAT_N);
 118 +}
 119 +
 120 +static int n516_bat_get_status(struct power_supply *b)
 121 +{
 122 +       if (power_supply_am_i_supplied(b)) {
 123 +               if (n516_bat_charging())
 124 +                       return POWER_SUPPLY_STATUS_CHARGING;
 125 +               else
 126 +                       return POWER_SUPPLY_STATUS_FULL;
 127 +       } else {
 128 +               return POWER_SUPPLY_STATUS_DISCHARGING;
 129 +       }
 130 +}
 131 +
 132 +static int n516_bat_get_charge(struct power_supply *b)
 133 +{
 134 +       return batt_charge[the_lpc->battery_level];
 135 +}
 136 +
 137 +static int n516_bat_get_property(struct power_supply *b,
 138 +               enum power_supply_property psp,
 139 +               union power_supply_propval *val)
 140 +{
 141 +       switch (psp) {
 142 +       case POWER_SUPPLY_PROP_STATUS:
 143 +               val->intval = n516_bat_get_status(b);
 144 +               break;
 145 +       case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 146 +               val->intval = 100;
 147 +               break;
 148 +       case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
 149 +               val->intval = 0;
 150 +               break;
 151 +       case POWER_SUPPLY_PROP_CHARGE_NOW:
 152 +               val->intval = n516_bat_get_charge(b);
 153 +               break;
 154 +       default:
 155 +               return -EINVAL;
 156 +       }
 157 +       return 0;
 158 +}
 159 +
 160 +static void n516_bat_power_changed(struct power_supply *p)
 161 +{
 162 +       if (power_supply_am_i_supplied(p) && !n516_bat_charging())
 163 +               the_lpc->battery_level = MAX_BAT_LEVEL;
 164 +
 165 +       power_supply_changed(p);
 166 +}
 167 +
 168 +static enum power_supply_property n516_bat_properties[] = {
 169 +       POWER_SUPPLY_PROP_STATUS,
 170 +       POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 171 +       POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
 172 +       POWER_SUPPLY_PROP_CHARGE_NOW,
 173 +};
 174 +
 175 +static struct power_supply n516_battery = {
 176 +       .name           = "n516-battery",
 177 +       .get_property   = n516_bat_get_property,
 178 +       .properties     = n516_bat_properties,
 179 +       .num_properties = ARRAY_SIZE(n516_bat_properties),
 180 +       .external_power_changed = n516_bat_power_changed,
 181 +};
 182 +
 183 +static irqreturn_t n516_bat_charge_irq(int irq, void *dev)
 184 +{
 185 +       struct power_supply *psy = dev;
 186 +
 187 +       dev_dbg(psy->dev, "Battery charging IRQ\n");
 188 +
 189 +       if (power_supply_am_i_supplied(psy) && !n516_bat_charging())
 190 +               the_lpc->battery_level = MAX_BAT_LEVEL;
 191 +
 192 +       power_supply_changed(psy);
 193 +
 194 +       return IRQ_HANDLED;
 195 +}
 196 +
 197 +static int n516_lpc_send_message(struct n516_lpc_chip *chip, unsigned char val)
 198 +{
 199 +       struct i2c_client *client = chip->i2c_client;
 200 +       struct i2c_msg msg = {client->addr, client->flags, 1, &val};
 201 +       int ret = 0;
 202 +
 203 +       ret = i2c_transfer(client->adapter, &msg, 1);
 204 +       return ret > 0 ? 0 : ret;
 205 +}
 206 +
 207 +static void n516_key_event(struct n516_lpc_chip *chip, unsigned char keycode)
 208 +{
 209 +       struct i2c_client *client = chip->i2c_client;
 210 +       bool long_press = false;
 211 +
 212 +       if (keycode & 0x40) {
 213 +               keycode &= ~0x40;
 214 +               long_press = true;
 215 +       }
 216 +
 217 +       dev_dbg(&client->dev, "keycode: 0x%02x, long_press: 0x%02x\n", keycode, (unsigned int)long_press);
 218 +
 219 +       if (keycode >= ARRAY_SIZE(n516_lpc_keymap) || n516_lpc_keymap[keycode] == 0)
 220 +               return;
 221 +
 222 +       if (long_press)
 223 +               input_report_key(chip->input, KEY_LEFTALT, 1);
 224 +
 225 +       input_report_key(chip->input, n516_lpc_keymap[keycode], 1);
 226 +       input_sync(chip->input);
 227 +       input_report_key(chip->input, n516_lpc_keymap[keycode], 0);
 228 +
 229 +       if (long_press)
 230 +               input_report_key(chip->input, KEY_LEFTALT, 0);
 231 +       input_sync(chip->input);
 232 +}
 233 +
 234 +static void n516_battery_event(struct n516_lpc_chip *chip, unsigned char battery_level)
 235 +{
 236 +       if (battery_level != chip->battery_level) {
 237 +               chip->battery_level = battery_level;
 238 +               power_supply_changed(&n516_battery);
 239 +       }
 240 +}
 241 +
 242 +static irqreturn_t n516_lpc_irq_thread(int irq, void *devid)
 243 +{
 244 +       struct n516_lpc_chip *chip = (struct n516_lpc_chip*)devid;
 245 +       int ret;
 246 +       unsigned char raw_msg;
 247 +       struct i2c_client *client = chip->i2c_client;
 248 +       struct i2c_msg msg = {client->addr, client->flags | I2C_M_RD, 1, &raw_msg};
 249 +
 250 +       if (client->dev.power.status >= DPM_OFF)
 251 +               return IRQ_HANDLED;
 252 +
 253 +       ret = i2c_transfer(client->adapter, &msg, 1);
 254 +       if (ret != 1) {
 255 +               dev_dbg(&client->dev, "I2C error: %d\n", ret);
 256 +               return IRQ_HANDLED;
 257 +       }
 258 +
 259 +       dev_dbg(&client->dev, "msg: 0x%02x\n", raw_msg);
 260 +
 261 +       /* Ack wakeup event */
 262 +       if ((raw_msg & ~0x40) < ARRAY_SIZE(n516_lpc_keymap))
 263 +               n516_key_event(chip, raw_msg);
 264 +       else if ((raw_msg >= 0x81) && (raw_msg <= 0x87))
 265 +               n516_battery_event(chip, raw_msg - 0x81);
 266 +       else if (raw_msg == 0x7e)
 267 +               n516_lpc_send_message(chip, 0x00);
 268 +       else
 269 +               dev_warn(&client->dev, "Unknown message: %x\n", raw_msg);
 270 +
 271 +       if (chip->suspending)
 272 +               chip->can_sleep = 0;
 273 +
 274 +       return IRQ_HANDLED;
 275 +}
 276 +
 277 +static void n516_lpc_power_off(void)
 278 +{
 279 +       struct i2c_client *client = the_lpc->i2c_client;
 280 +       unsigned char val = 0x01;
 281 +       struct i2c_msg msg = {client->addr, client->flags, 1, &val};
 282 +
 283 +       printk("Issue LPC POWEROFF command...\n");
 284 +       while (1)
 285 +               i2c_transfer(client->adapter, &msg, 1);
 286 +}
 287 +
 288 +static int n516_lpc_detect(struct i2c_client *client, struct i2c_board_info *info)
 289 +{
 290 +       return 0;
 291 +}
 292 +
 293 +static int n516_lpc_suspend_notifier(struct notifier_block *nb,
 294 +                                               unsigned long event,
 295 +                                               void *dummy)
 296 +{
 297 +       switch(event) {
 298 +       case PM_SUSPEND_PREPARE:
 299 +               the_lpc->suspending = 1;
 300 +               the_lpc->can_sleep = 1;
 301 +               break;
 302 +       case PM_POST_SUSPEND:
 303 +               the_lpc->suspending = 0;
 304 +               the_lpc->can_sleep = 1;
 305 +               break;
 306 +       default:
 307 +               return NOTIFY_DONE;
 308 +       }
 309 +       return NOTIFY_OK;
 310 +}
 311 +
 312 +static struct notifier_block n516_lpc_notif_block = {
 313 +       .notifier_call = n516_lpc_suspend_notifier,
 314 +};
 315 +
 316 +static int __devinit n516_lpc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 317 +{
 318 +       struct n516_lpc_chip *chip;
 319 +       struct input_dev *input;
 320 +       int ret = 0;
 321 +       int i;
 322 +
 323 +       chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 324 +       if (!chip)
 325 +               return -ENOMEM;
 326 +
 327 +       the_lpc = chip;
 328 +       chip->i2c_client = client;
 329 +       if ((batt_level > 0) && (batt_level < ARRAY_SIZE(batt_charge)))
 330 +               chip->battery_level = batt_level;
 331 +       else
 332 +               chip->battery_level = 1;
 333 +
 334 +       i2c_set_clientdata(client, chip);
 335 +
 336 +       ret = gpio_request(GPIO_LPC_INT, "LPC interrupt request");
 337 +       if (ret) {
 338 +               dev_err(&client->dev, "Unable to reguest LPC INT GPIO\n");
 339 +               goto err_gpio_req_lpcint;
 340 +       }
 341 +
 342 +       ret = gpio_request(GPIO_CHARG_STAT_N, "LPC charging status");
 343 +       if (ret) {
 344 +               dev_err(&client->dev, "Unable to reguest CHARG STAT GPIO\n");
 345 +               goto err_gpio_req_chargstat;
 346 +       }
 347 +
 348 +       /* Enter normal mode */
 349 +       n516_lpc_send_message(chip, 0x2);
 350 +
 351 +       input = input_allocate_device();
 352 +       if (!input) {
 353 +               dev_err(&client->dev, "Unable to allocate input device\n");
 354 +               ret = -ENOMEM;
 355 +               goto err_input_alloc;
 356 +       }
 357 +
 358 +       chip->input = input;
 359 +
 360 +       __set_bit(EV_KEY, input->evbit);
 361 +
 362 +       for (i = 0; i < ARRAY_SIZE(n516_lpc_keymap); i++)
 363 +               __set_bit(n516_lpc_keymap[i], input->keybit);
 364 +
 365 +       __set_bit(KEY_LEFTALT, input->keybit);
 366 +
 367 +       input->name = "n516-keys";
 368 +       input->phys = "n516-keys/input0";
 369 +       input->dev.parent = &client->dev;
 370 +       input->id.bustype = BUS_I2C;
 371 +       input->id.vendor = 0x0001;
 372 +       input->id.product = 0x0001;
 373 +       input->id.version = 0x0100;
 374 +
 375 +       ret = input_register_device(input);
 376 +       if (ret < 0) {
 377 +               dev_err(&client->dev, "Unable to register input device\n");
 378 +               goto err_input_register;
 379 +       }
 380 +
 381 +       ret = power_supply_register(NULL, &n516_battery);
 382 +       if (ret) {
 383 +               dev_err(&client->dev, "Unable to register N516 battery\n");
 384 +               goto err_bat_reg;
 385 +       }
 386 +
 387 +       ret = request_threaded_irq(gpio_to_irq(GPIO_LPC_INT), NULL,
 388 +                                       n516_lpc_irq_thread,
 389 +                                       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 390 +                                       "lpc", chip);
 391 +       if (ret) {
 392 +               dev_err(&client->dev, "request_irq failed: %d\n", ret);
 393 +               goto err_request_lpc_irq;
 394 +       }
 395 +
 396 +       ret = request_irq(gpio_to_irq(GPIO_CHARG_STAT_N), n516_bat_charge_irq,
 397 +                               IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 398 +                               "battery charging", &n516_battery);
 399 +       if (ret) {
 400 +               dev_err(&client->dev, "Unable to claim battery charging IRQ\n");
 401 +               goto err_request_chrg_irq;
 402 +       }
 403 +
 404 +       pm_power_off = n516_lpc_power_off;
 405 +       ret = register_pm_notifier(&n516_lpc_notif_block);
 406 +       if (ret) {
 407 +               dev_err(&client->dev, "Unable to register PM notify block\n");
 408 +               goto err_reg_pm_notifier;
 409 +       }
 410 +
 411 +       device_init_wakeup(&client->dev, 1);
 412 +
 413 +       return 0;
 414 +
 415 +       unregister_pm_notifier(&n516_lpc_notif_block);
 416 +err_reg_pm_notifier:
 417 +       free_irq(gpio_to_irq(GPIO_CHARG_STAT_N), &n516_battery);
 418 +err_request_chrg_irq:
 419 +       free_irq(gpio_to_irq(GPIO_LPC_INT), chip);
 420 +err_request_lpc_irq:
 421 +       power_supply_unregister(&n516_battery);
 422 +err_bat_reg:
 423 +       input_unregister_device(input);
 424 +err_input_register:
 425 +       input_free_device(input);
 426 +err_input_alloc:
 427 +       gpio_free(GPIO_CHARG_STAT_N);
 428 +err_gpio_req_chargstat:
 429 +       gpio_free(GPIO_LPC_INT);
 430 +err_gpio_req_lpcint:
 431 +       i2c_set_clientdata(client, NULL);
 432 +       kfree(chip);
 433 +
 434 +       return ret;
 435 +}
 436 +
 437 +static int __devexit n516_lpc_remove(struct i2c_client *client)
 438 +{
 439 +       struct n516_lpc_chip *chip = i2c_get_clientdata(client);
 440 +
 441 +       unregister_pm_notifier(&n516_lpc_notif_block);
 442 +       pm_power_off = NULL;
 443 +       free_irq(gpio_to_irq(GPIO_CHARG_STAT_N), &n516_battery);
 444 +       free_irq(gpio_to_irq(GPIO_LPC_INT), chip);
 445 +       power_supply_unregister(&n516_battery);
 446 +       input_unregister_device(chip->input);
 447 +       gpio_free(GPIO_CHARG_STAT_N);
 448 +       gpio_free(GPIO_LPC_INT);
 449 +       i2c_set_clientdata(client, NULL);
 450 +       kfree(chip);
 451 +
 452 +       return 0;
 453 +}
 454 +
 455 +#if CONFIG_PM
 456 +static int n516_lpc_suspend(struct i2c_client *client, pm_message_t msg)
 457 +{
 458 +       if (!the_lpc->can_sleep)
 459 +               return -EBUSY;
 460 +
 461 +       if (device_may_wakeup(&client->dev))
 462 +               enable_irq_wake(gpio_to_irq(GPIO_LPC_INT));
 463 +
 464 +       return 0;
 465 +}
 466 +
 467 +static int n516_lpc_resume(struct i2c_client *client)
 468 +{
 469 +       if (device_may_wakeup(&client->dev))
 470 +               disable_irq_wake(gpio_to_irq(GPIO_LPC_INT));
 471 +
 472 +       return 0;
 473 +}
 474 +#else
 475 +#define n516_lpc_suspend NULL
 476 +#define n516_lpc_resume NULL
 477 +#endif
 478 +
 479 +
 480 +static struct i2c_driver n516_lpc_driver = {
 481 +       .class          = I2C_CLASS_HWMON,
 482 +       .driver         = {
 483 +               .name   = "n516-keys",
 484 +               .owner  = THIS_MODULE,
 485 +       },
 486 +       .probe          = n516_lpc_probe,
 487 +       .remove         = __devexit_p(n516_lpc_remove),
 488 +       .detect         = n516_lpc_detect,
 489 +       .id_table       = n516_lpc_i2c_ids,
 490 +       .address_list   = normal_i2c,
 491 +       .suspend        = n516_lpc_suspend,
 492 +       .resume         = n516_lpc_resume,
 493 +};
 494 +
 495 +static int __init n516_lpc_init(void)
 496 +{
 497 +       return i2c_add_driver(&n516_lpc_driver);
 498 +}
 499 +module_init(n516_lpc_init);
 500 +
 501 +static void __exit n516_lpc_exit(void)
 502 +{
 503 +       i2c_del_driver(&n516_lpc_driver);
 504 +}
 505 +module_exit(n516_lpc_exit);
 506 +
 507 +MODULE_AUTHOR("Yauhen Kharuzhy");
 508 +MODULE_LICENSE("GPL");
 509 +MODULE_DESCRIPTION("Keys and power controller driver for N516");
 510 +MODULE_ALIAS("platform:n516-keys");