drivers/power/twl6030.c

   1 /*
   2  * (C) Copyright 2010
   3  * Texas Instruments, <www.ti.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (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,
  21  * MA 02111-1307 USA
  22  */
  23 #include <config.h>
  24 #ifdef CONFIG_TWL6030_POWER
  25
  26 #include <twl6030.h>
  27
  28 /* Functions to read and write from TWL6030 */
  29 static inline int twl6030_i2c_write_u8(u8 chip_no, u8 reg, u8 val)
  30 {
  31         return i2c_write(chip_no, reg, 1, &val, 1);
  32 }
  33
  34 static inline int twl6030_i2c_read_u8(u8 chip_no, u8 reg, u8 *val)
  35 {
  36         return i2c_read(chip_no, reg, 1, val, 1);
  37 }
  38
  39 static int twl6030_gpadc_read_channel(u8 channel_no)
  40 {
  41         u8 lsb = 0;
  42         u8 msb = 0;
  43         int ret = 0;
  44
  45         ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC,
  46                                   GPCH0_LSB + channel_no * 2, &lsb);
  47         if (ret)
  48                 return ret;
  49
  50         ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC,
  51                                   GPCH0_MSB + channel_no * 2, &msb);
  52         if (ret)
  53                 return ret;
  54
  55         return (msb << 8) | lsb;
  56 }
  57
  58 static int twl6030_gpadc_sw2_trigger(void)
  59 {
  60         u8 val;
  61         int ret = 0;
  62
  63         ret = twl6030_i2c_write_u8(TWL6030_CHIP_ADC, CTRL_P2, CTRL_P2_SP2);
  64         if (ret)
  65                 return ret;
  66
  67         /* Waiting until the SW1 conversion ends*/
  68         val =  CTRL_P2_BUSY;
  69
  70         while (!((val & CTRL_P2_EOCP2) && (!(val & CTRL_P2_BUSY)))) {
  71                 ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, CTRL_P2, &val);
  72                 if (ret)
  73                         return ret;
  74                 udelay(1000);
  75         }
  76
  77         return 0;
  78 }
  79
  80 void twl6030_stop_usb_charging(void)
  81 {
  82         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CONTROLLER_CTRL1, 0);
  83
  84         return;
  85 }
  86
  87 void twl6030_start_usb_charging(void)
  88 {
  89         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  90                              CHARGERUSB_VICHRG, CHARGERUSB_VICHRG_1500);
  91         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  92                              CHARGERUSB_CINLIMIT, CHARGERUSB_CIN_LIMIT_NONE);
  93         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  94                              CONTROLLER_INT_MASK, MBAT_TEMP);
  95         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  96                              CHARGERUSB_INT_MASK, MASK_MCHARGERUSB_THMREG);
  97         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  98                              CHARGERUSB_VOREG, CHARGERUSB_VOREG_4P0);
  99         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
 100                              CHARGERUSB_CTRL2, CHARGERUSB_CTRL2_VITERM_400);
 101         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_CTRL1, TERM);
 102         /* Enable USB charging */
 103         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
 104                              CONTROLLER_CTRL1, CONTROLLER_CTRL1_EN_CHARGER);
 105         return;
 106 }
 107
 108 int twl6030_get_battery_current(void)
 109 {
 110         int battery_current = 0;
 111         u8 msb = 0;
 112         u8 lsb = 0;
 113
 114         twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, FG_REG_11, &msb);
 115         twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, FG_REG_10, &lsb);
 116         battery_current = ((msb << 8) | lsb);
 117
 118         /* convert 10 bit signed number to 16 bit signed number */
 119         if (battery_current >= 0x2000)
 120                 battery_current = (battery_current - 0x4000);
 121
 122         battery_current = battery_current * 3000 / 4096;
 123         printf("Battery Current: %d mA\n", battery_current);
 124
 125         return battery_current;
 126 }
 127
 128 int twl6030_get_battery_voltage(void)
 129 {
 130         int battery_volt = 0;
 131         int ret = 0;
 132
 133         /* Start GPADC SW conversion */
 134         ret = twl6030_gpadc_sw2_trigger();
 135         if (ret) {
 136                 printf("Failed to convert battery voltage\n");
 137                 return ret;
 138         }
 139
 140         /* measure Vbat voltage */
 141         battery_volt = twl6030_gpadc_read_channel(7);
 142         if (battery_volt < 0) {
 143                 printf("Failed to read battery voltage\n");
 144                 return ret;
 145         }
 146         battery_volt = (battery_volt * 25 * 1000) >> (10 + 2);
 147         printf("Battery Voltage: %d mV\n", battery_volt);
 148
 149         return battery_volt;
 150 }
 151
 152 void twl6030_init_battery_charging(void)
 153 {
 154         u8 stat1 = 0;
 155         int battery_volt = 0;
 156         int ret = 0;
 157
 158         /* Enable VBAT measurement */
 159         twl6030_i2c_write_u8(TWL6030_CHIP_PM, MISC1, VBAT_MEAS);
 160
 161         /* Enable GPADC module */
 162         ret = twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, TOGGLE1, FGS | GPADCS);
 163         if (ret) {
 164                 printf("Failed to enable GPADC\n");
 165                 return;
 166         }
 167
 168         battery_volt = twl6030_get_battery_voltage();
 169         if (battery_volt < 0)
 170                 return;
 171
 172         if (battery_volt < 3000)
 173                 printf("Main battery voltage too low!\n");
 174
 175         /* Check for the presence of USB charger */
 176         twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, CONTROLLER_STAT1, &stat1);
 177
 178         /* check for battery presence indirectly via Fuel gauge */
 179         if ((stat1 & VBUS_DET) && (battery_volt < 3300))
 180                 twl6030_start_usb_charging();
 181
 182         return;
 183 }
 184
 185 void twl6030_power_mmc_init()
 186 {
 187         /* set voltage to 3.0 and turnon for APP */
 188         twl6030_i2c_write_u8(TWL6030_CHIP_PM, VMMC_CFG_VOLTATE, 0x15);
 189         twl6030_i2c_write_u8(TWL6030_CHIP_PM, VMMC_CFG_STATE, 0x21);
 190 }
 191
 192 void twl6030_usb_device_settings()
 193 {
 194         u8 data = 0;
 195
 196         /* Select APP Group and set state to ON */
 197         twl6030_i2c_write_u8(TWL6030_CHIP_PM, VUSB_CFG_STATE, 0x21);
 198
 199         twl6030_i2c_read_u8(TWL6030_CHIP_PM, MISC2, &data);
 200         data |= 0x10;
 201
 202         /* Select the input supply for VBUS regulator */
 203         twl6030_i2c_write_u8(TWL6030_CHIP_PM, MISC2, data);
 204 }
 205 #endif