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 static int twl6030_gpadc_read_channel(u8 channel_no)
  29 {
  30         u8 lsb = 0;
  31         u8 msb = 0;
  32         int ret = 0;
  33
  34         ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC,
  35                                   GPCH0_LSB + channel_no * 2, &lsb);
  36         if (ret)
  37                 return ret;
  38
  39         ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC,
  40                                   GPCH0_MSB + channel_no * 2, &msb);
  41         if (ret)
  42                 return ret;
  43
  44         return (msb << 8) | lsb;
  45 }
  46
  47 static int twl6030_gpadc_sw2_trigger(void)
  48 {
  49         u8 val;
  50         int ret = 0;
  51
  52         ret = twl6030_i2c_write_u8(TWL6030_CHIP_ADC, CTRL_P2, CTRL_P2_SP2);
  53         if (ret)
  54                 return ret;
  55
  56         /* Waiting until the SW1 conversion ends*/
  57         val =  CTRL_P2_BUSY;
  58
  59         while (!((val & CTRL_P2_EOCP2) && (!(val & CTRL_P2_BUSY)))) {
  60                 ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, CTRL_P2, &val);
  61                 if (ret)
  62                         return ret;
  63                 udelay(1000);
  64         }
  65
  66         return 0;
  67 }
  68
  69 void twl6030_stop_usb_charging(void)
  70 {
  71         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CONTROLLER_CTRL1, 0);
  72
  73         return;
  74 }
  75
  76 void twl6030_start_usb_charging(void)
  77 {
  78         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  79                              CHARGERUSB_VICHRG, CHARGERUSB_VICHRG_1500);
  80         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  81                              CHARGERUSB_CINLIMIT, CHARGERUSB_CIN_LIMIT_NONE);
  82         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  83                              CONTROLLER_INT_MASK, MBAT_TEMP);
  84         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  85                              CHARGERUSB_INT_MASK, MASK_MCHARGERUSB_THMREG);
  86         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  87                              CHARGERUSB_VOREG, CHARGERUSB_VOREG_4P0);
  88         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  89                              CHARGERUSB_CTRL2, CHARGERUSB_CTRL2_VITERM_400);
  90         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_CTRL1, TERM);
  91         /* Enable USB charging */
  92         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  93                              CONTROLLER_CTRL1, CONTROLLER_CTRL1_EN_CHARGER);
  94         return;
  95 }
  96
  97 int twl6030_get_battery_current(void)
  98 {
  99         int battery_current = 0;
 100         u8 msb = 0;
 101         u8 lsb = 0;
 102
 103         twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, FG_REG_11, &msb);
 104         twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, FG_REG_10, &lsb);
 105         battery_current = ((msb << 8) | lsb);
 106
 107         /* convert 10 bit signed number to 16 bit signed number */
 108         if (battery_current >= 0x2000)
 109                 battery_current = (battery_current - 0x4000);
 110
 111         battery_current = battery_current * 3000 / 4096;
 112         printf("Battery Current: %d mA\n", battery_current);
 113
 114         return battery_current;
 115 }
 116
 117 int twl6030_get_battery_voltage(void)
 118 {
 119         int battery_volt = 0;
 120         int ret = 0;
 121
 122         /* Start GPADC SW conversion */
 123         ret = twl6030_gpadc_sw2_trigger();
 124         if (ret) {
 125                 printf("Failed to convert battery voltage\n");
 126                 return ret;
 127         }
 128
 129         /* measure Vbat voltage */
 130         battery_volt = twl6030_gpadc_read_channel(7);
 131         if (battery_volt < 0) {
 132                 printf("Failed to read battery voltage\n");
 133                 return ret;
 134         }
 135         battery_volt = (battery_volt * 25 * 1000) >> (10 + 2);
 136         printf("Battery Voltage: %d mV\n", battery_volt);
 137
 138         return battery_volt;
 139 }
 140
 141 void twl6030_init_battery_charging(void)
 142 {
 143         u8 stat1 = 0;
 144         int battery_volt = 0;
 145         int ret = 0;
 146
 147         /* Enable VBAT measurement */
 148         twl6030_i2c_write_u8(TWL6030_CHIP_PM, MISC1, VBAT_MEAS);
 149
 150         /* Enable GPADC module */
 151         ret = twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, TOGGLE1, FGS | GPADCS);
 152         if (ret) {
 153                 printf("Failed to enable GPADC\n");
 154                 return;
 155         }
 156
 157         battery_volt = twl6030_get_battery_voltage();
 158         if (battery_volt < 0)
 159                 return;
 160
 161         if (battery_volt < 3000)
 162                 printf("Main battery voltage too low!\n");
 163
 164         /* Check for the presence of USB charger */
 165         twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, CONTROLLER_STAT1, &stat1);
 166
 167         /* check for battery presence indirectly via Fuel gauge */
 168         if ((stat1 & VBUS_DET) && (battery_volt < 3300))
 169                 twl6030_start_usb_charging();
 170
 171         return;
 172 }
 173
 174 void twl6030_power_mmc_init()
 175 {
 176         /* set voltage to 3.0 and turnon for APP */
 177         twl6030_i2c_write_u8(TWL6030_CHIP_PM, VMMC_CFG_VOLTATE, 0x15);
 178         twl6030_i2c_write_u8(TWL6030_CHIP_PM, VMMC_CFG_STATE, 0x21);
 179 }
 180
 181 void twl6030_usb_device_settings()
 182 {
 183         u8 data = 0;
 184
 185         /* Select APP Group and set state to ON */
 186         twl6030_i2c_write_u8(TWL6030_CHIP_PM, VUSB_CFG_STATE, 0x21);
 187
 188         twl6030_i2c_read_u8(TWL6030_CHIP_PM, MISC2, &data);
 189         data |= 0x10;
 190
 191         /* Select the input supply for VBUS regulator */
 192         twl6030_i2c_write_u8(TWL6030_CHIP_PM, MISC2, data);
 193 }
 194 #endif