include/linux/power/bq2415x_charger.h

   1 /*
   2  * bq2415x charger driver
   3  *
   4  * Copyright (C) 2011-2012  Pali Rohár <pali.rohar@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #ifndef BQ2415X_CHARGER_H
  22 #define BQ2415X_CHARGER_H
  23
  24 /*
  25  * This is platform data for bq2415x chip. It contains default board
  26  * voltages and currents which can be also later configured via sysfs. If
  27  * value is -1 then default chip value (specified in datasheet) will be
  28  * used.
  29  *
  30  * Value resistor_sense is needed for for configuring charge and
  31  * termination current. It it is less or equal to zero, configuring charge
  32  * and termination current will not be possible.
  33  *
  34  * Function set_mode_hook is needed for automode (setting correct current
  35  * limit when charger is connected/disconnected or setting boost mode).
  36  * When is NULL, automode function is disabled. When is not NULL, it must
  37  * have this prototype:
  38  *
  39  *    int (*set_mode_hook)(
  40  *      void (*hook)(enum bq2415x_mode mode, void *data),
  41  *      void *data)
  42  *
  43  * hook is hook function (see below) and data is pointer to driver private
  44  * data
  45  *
  46  * bq2415x driver will call it as:
  47  *
  48  *    platform_data->set_mode_hook(bq2415x_hook_function, bq2415x_device);
  49  *
  50  * Board/platform function set_mode_hook return non zero value when hook
  51  * function was successful registered. Platform code should call that hook
  52  * function (which get from pointer, with data) every time when charger
  53  * was connected/disconnected or require to enable boost mode. bq2415x
  54  * driver then will set correct current limit, enable/disable charger or
  55  * boost mode.
  56  *
  57  * Hook function has this prototype:
  58  *
  59  *    void hook(enum bq2415x_mode mode, void *data);
  60  *
  61  * mode is bq2415x mode (charger or boost)
  62  * data is pointer to driver private data (which get from
  63  * set_charger_type_hook)
  64  *
  65  * When bq driver is being unloaded, it call function:
  66  *
  67  *    platform_data->set_mode_hook(NULL, NULL);
  68  *
  69  * (hook function and driver private data are NULL)
  70  *
  71  * After that board/platform code must not call driver hook function! It
  72  * is possible that pointer to hook function will not be valid and calling
  73  * will cause undefined result.
  74  */
  75
  76 /* Supported modes with maximal current limit */
  77 enum bq2415x_mode {
  78         BQ2415X_MODE_OFF,               /* offline mode (charger disabled) */
  79         BQ2415X_MODE_NONE,              /* unknown charger (100mA) */
  80         BQ2415X_MODE_HOST_CHARGER,      /* usb host/hub charger (500mA) */
  81         BQ2415X_MODE_DEDICATED_CHARGER, /* dedicated charger (unlimited) */
  82         BQ2415X_MODE_BOOST,             /* boost mode (charging disabled) */
  83 };
  84
  85 struct bq2415x_platform_data {
  86         int current_limit;              /* mA */
  87         int weak_battery_voltage;       /* mV */
  88         int battery_regulation_voltage; /* mV */
  89         int charge_current;             /* mA */
  90         int termination_current;        /* mA */
  91         int resistor_sense;             /* m ohm */
  92         int (*set_mode_hook)(void (*hook)(enum bq2415x_mode mode, void *data),
  93                              void *data);
  94 };
  95
  96 #endif