/* * Batttery Driver for Dialog DA9052 PMICs * * Copyright(c) 2011 Dialog Semiconductor Ltd. * * Author: David Dajun Chen * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #include /* STATIC CONFIGURATION */ #define DA9052_BAT_CUTOFF_VOLT 2800 #define DA9052_BAT_TSH 62000 #define DA9052_BAT_LOW_CAP 4 #define DA9052_AVG_SZ 4 #define DA9052_VC_TBL_SZ 68 #define DA9052_VC_TBL_REF_SZ 3 #define DA9052_ISET_USB_MASK 0x0F #define DA9052_CHG_USB_ILIM_MASK 0x40 #define DA9052_CHG_LIM_COLS 16 #define DA9052_MEAN(x, y) ((x + y) / 2) enum charger_type_enum { DA9052_NOCHARGER = 1, DA9052_CHARGER, }; static const u16 da9052_chg_current_lim[2][DA9052_CHG_LIM_COLS] = { {70, 80, 90, 100, 110, 120, 400, 450, 500, 550, 600, 650, 700, 900, 1100, 1300}, {80, 90, 100, 110, 120, 400, 450, 500, 550, 600, 800, 1000, 1200, 1400, 1600, 1800}, }; static const u16 vc_tbl_ref[3] = {10, 25, 40}; /* Lookup table for voltage vs capacity */ static u32 const vc_tbl[3][68][2] = { /* For temperature 10 degree Celsius */ { {4082, 100}, {4036, 98}, {4020, 96}, {4008, 95}, {3997, 93}, {3983, 91}, {3964, 90}, {3943, 88}, {3926, 87}, {3912, 85}, {3900, 84}, {3890, 82}, {3881, 80}, {3873, 79}, {3865, 77}, {3857, 76}, {3848, 74}, {3839, 73}, {3829, 71}, {3820, 70}, {3811, 68}, {3802, 67}, {3794, 65}, {3785, 64}, {3778, 62}, {3770, 61}, {3763, 59}, {3756, 58}, {3750, 56}, {3744, 55}, {3738, 53}, {3732, 52}, {3727, 50}, {3722, 49}, {3717, 47}, {3712, 46}, {3708, 44}, {3703, 43}, {3700, 41}, {3696, 40}, {3693, 38}, {3691, 37}, {3688, 35}, {3686, 34}, {3683, 32}, {3681, 31}, {3678, 29}, {3675, 28}, {3672, 26}, {3669, 25}, {3665, 23}, {3661, 22}, {3656, 21}, {3651, 19}, {3645, 18}, {3639, 16}, {3631, 15}, {3622, 13}, {3611, 12}, {3600, 10}, {3587, 9}, {3572, 7}, {3548, 6}, {3503, 5}, {3420, 3}, {3268, 2}, {2992, 1}, {2746, 0} }, /* For temperature 25 degree Celsius */ { {4102, 100}, {4065, 98}, {4048, 96}, {4034, 95}, {4021, 93}, {4011, 92}, {4001, 90}, {3986, 88}, {3968, 87}, {3952, 85}, {3938, 84}, {3926, 82}, {3916, 81}, {3908, 79}, {3900, 77}, {3892, 76}, {3883, 74}, {3874, 73}, {3864, 71}, {3855, 70}, {3846, 68}, {3836, 67}, {3827, 65}, {3819, 64}, {3810, 62}, {3801, 61}, {3793, 59}, {3786, 58}, {3778, 56}, {3772, 55}, {3765, 53}, {3759, 52}, {3754, 50}, {3748, 49}, {3743, 47}, {3738, 46}, {3733, 44}, {3728, 43}, {3724, 41}, {3720, 40}, {3716, 38}, {3712, 37}, {3709, 35}, {3706, 34}, {3703, 33}, {3701, 31}, {3698, 30}, {3696, 28}, {3693, 27}, {3690, 25}, {3687, 24}, {3683, 22}, {3680, 21}, {3675, 19}, {3671, 18}, {3666, 17}, {3660, 15}, {3654, 14}, {3647, 12}, {3639, 11}, {3630, 9}, {3621, 8}, {3613, 6}, {3606, 5}, {3597, 4}, {3582, 2}, {3546, 1}, {2747, 0} }, /* For temperature 40 degree Celsius */ { {4114, 100}, {4081, 98}, {4065, 96}, {4050, 95}, {4036, 93}, {4024, 92}, {4013, 90}, {4002, 88}, {3990, 87}, {3976, 85}, {3962, 84}, {3950, 82}, {3939, 81}, {3930, 79}, {3921, 77}, {3912, 76}, {3902, 74}, {3893, 73}, {3883, 71}, {3874, 70}, {3865, 68}, {3856, 67}, {3847, 65}, {3838, 64}, {3829, 62}, {3820, 61}, {3812, 59}, {3803, 58}, {3795, 56}, {3787, 55}, {3780, 53}, {3773, 52}, {3767, 50}, {3761, 49}, {3756, 47}, {3751, 46}, {3746, 44}, {3741, 43}, {3736, 41}, {3732, 40}, {3728, 38}, {3724, 37}, {3720, 35}, {3716, 34}, {3713, 33}, {3710, 31}, {3707, 30}, {3704, 28}, {3701, 27}, {3698, 25}, {3695, 24}, {3691, 22}, {3686, 21}, {3681, 19}, {3676, 18}, {3671, 17}, {3666, 15}, {3661, 14}, {3655, 12}, {3648, 11}, {3640, 9}, {3632, 8}, {3622, 6}, {3616, 5}, {3611, 4}, {3604, 2}, {3594, 1}, {2747, 0} } }; struct da9052_battery { struct da9052 *da9052; struct power_supply psy; struct notifier_block nb; int charger_type; int status; int health; }; static inline int volt_reg_to_mV(int value) { return ((value * 1000) / 512) + 2500; } static inline int ichg_reg_to_mA(int value) { return (value * 3900) / 1000; } static int da9052_read_chgend_current(struct da9052_battery *bat, int *current_mA) { int ret; if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) return -EINVAL; ret = da9052_reg_read(bat->da9052, DA9052_ICHG_END_REG); if (ret < 0) return ret; *current_mA = ichg_reg_to_mA(ret & DA9052_ICHGEND_ICHGEND); return 0; } static int da9052_read_chg_current(struct da9052_battery *bat, int *current_mA) { int ret; if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) return -EINVAL; ret = da9052_reg_read(bat->da9052, DA9052_ICHG_AV_REG); if (ret < 0) return ret; *current_mA = ichg_reg_to_mA(ret & DA9052_ICHGAV_ICHGAV); return 0; } static int da9052_bat_check_status(struct da9052_battery *bat, int *status) { u8 v[2] = {0, 0}; u8 bat_status; u8 chg_end; int ret; int chg_current; int chg_end_current; bool dcinsel; bool dcindet; bool vbussel; bool vbusdet; bool dc; bool vbus; ret = da9052_group_read(bat->da9052, DA9052_STATUS_A_REG, 2, v); if (ret < 0) return ret; bat_status = v[0]; chg_end = v[1]; dcinsel = bat_status & DA9052_STATUSA_DCINSEL; dcindet = bat_status & DA9052_STATUSA_DCINDET; vbussel = bat_status & DA9052_STATUSA_VBUSSEL; vbusdet = bat_status & DA9052_STATUSA_VBUSDET; dc = dcinsel && dcindet; vbus = vbussel && vbusdet; /* Preference to WALL(DCIN) charger unit */ if (dc || vbus) { bat->charger_type = DA9052_CHARGER; /* If charging end flag is set and Charging current is greater * than charging end limit then battery is charging */ if ((chg_end & DA9052_STATUSB_CHGEND) != 0) { ret = da9052_read_chg_current(bat, &chg_current); if (ret < 0) return ret; ret = da9052_read_chgend_current(bat, &chg_end_current); if (ret < 0) return ret; if (chg_current >= chg_end_current) bat->status = POWER_SUPPLY_STATUS_CHARGING; else bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING; } else { /* If Charging end flag is cleared then battery is * charging */ bat->status = POWER_SUPPLY_STATUS_CHARGING; } } else if (dcindet || vbusdet) { bat->charger_type = DA9052_CHARGER; bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING; } else { bat->charger_type = DA9052_NOCHARGER; bat->status = POWER_SUPPLY_STATUS_DISCHARGING; } if (status != NULL) *status = bat->status; return 0; } static int da9052_bat_read_volt(struct da9052_battery *bat, int *volt_mV) { int volt; volt = da9052_adc_manual_read(bat->da9052, DA9052_ADC_MAN_MUXSEL_VBAT); if (volt < 0) return volt; *volt_mV = volt_reg_to_mV(volt); return 0; } static int da9052_bat_check_presence(struct da9052_battery *bat, int *illegal) { int bat_temp; bat_temp = da9052_adc_read_temp(bat->da9052); if (bat_temp < 0) return bat_temp; if (bat_temp > DA9052_BAT_TSH) *illegal = 1; else *illegal = 0; return 0; } static int da9052_bat_interpolate(int vbat_lower, int vbat_upper, int level_lower, int level_upper, int bat_voltage) { int tmp; tmp = ((level_upper - level_lower) * 1000) / (vbat_upper - vbat_lower); tmp = level_lower + (((bat_voltage - vbat_lower) * tmp) / 1000); return tmp; } static unsigned char da9052_determine_vc_tbl_index(unsigned char adc_temp) { int i; if (adc_temp <= vc_tbl_ref[0]) return 0; if (adc_temp > vc_tbl_ref[DA9052_VC_TBL_REF_SZ - 1]) return DA9052_VC_TBL_REF_SZ - 1; for (i = 0; i < DA9052_VC_TBL_REF_SZ; i++) { if ((adc_temp > vc_tbl_ref[i]) && (adc_temp <= DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1]))) return i; if ((adc_temp > DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1])) && (adc_temp <= vc_tbl_ref[i])) return i + 1; } /* * For some reason authors of the driver didn't presume that we can * end up here. It might be OK, but might be not, no one knows for * sure. Go check your battery, is it on fire? */ WARN_ON(1); return 0; } static int da9052_bat_read_capacity(struct da9052_battery *bat, int *capacity) { int adc_temp; int bat_voltage; int vbat_lower; int vbat_upper; int level_upper; int level_lower; int ret; int flag; int i = 0; int j; ret = da9052_bat_read_volt(bat, &bat_voltage); if (ret < 0) return ret; adc_temp = da9052_adc_read_temp(bat->da9052); if (adc_temp < 0) return adc_temp; i = da9052_determine_vc_tbl_index(adc_temp); if (bat_voltage >= vc_tbl[i][0][0]) { *capacity = 100; return 0; } if (bat_voltage <= vc_tbl[i][DA9052_VC_TBL_SZ - 1][0]) { *capacity = 0; return 0; } flag = 0; for (j = 0; j < (DA9052_VC_TBL_SZ-1); j++) { if ((bat_voltage <= vc_tbl[i][j][0]) && (bat_voltage >= vc_tbl[i][j + 1][0])) { vbat_upper = vc_tbl[i][j][0]; vbat_lower = vc_tbl[i][j + 1][0]; level_upper = vc_tbl[i][j][1]; level_lower = vc_tbl[i][j + 1][1]; flag = 1; break; } } if (!flag) return -EIO; *capacity = da9052_bat_interpolate(vbat_lower, vbat_upper, level_lower, level_upper, bat_voltage); return 0; } static int da9052_bat_check_health(struct da9052_battery *bat, int *health) { int ret; int bat_illegal; int capacity; ret = da9052_bat_check_presence(bat, &bat_illegal); if (ret < 0) return ret; if (bat_illegal) { bat->health = POWER_SUPPLY_HEALTH_UNKNOWN; return 0; } if (bat->health != POWER_SUPPLY_HEALTH_OVERHEAT) { ret = da9052_bat_read_capacity(bat, &capacity); if (ret < 0) return ret; if (capacity < DA9052_BAT_LOW_CAP) bat->health = POWER_SUPPLY_HEALTH_DEAD; else bat->health = POWER_SUPPLY_HEALTH_GOOD; } *health = bat->health; return 0; } static irqreturn_t da9052_bat_irq(int irq, void *data) { struct da9052_battery *bat = data; int virq; virq = regmap_irq_get_virq(bat->da9052->irq_data, irq); irq -= virq; if (irq == DA9052_IRQ_CHGEND) bat->status = POWER_SUPPLY_STATUS_FULL; else da9052_bat_check_status(bat, NULL); if (irq == DA9052_IRQ_CHGEND || irq == DA9052_IRQ_DCIN || irq == DA9052_IRQ_VBUS || irq == DA9052_IRQ_TBAT) { power_supply_changed(&bat->psy); } return IRQ_HANDLED; } static int da9052_USB_current_notifier(struct notifier_block *nb, unsigned long events, void *data) { u8 row; u8 col; int *current_mA = data; int ret; struct da9052_battery *bat = container_of(nb, struct da9052_battery, nb); if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) return -EPERM; ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG); if (ret & DA9052_CHG_USB_ILIM_MASK) return -EPERM; if (bat->da9052->chip_id == DA9052) row = 0; else row = 1; if (*current_mA < da9052_chg_current_lim[row][0] || *current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1]) return -EINVAL; for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) { if (*current_mA <= da9052_chg_current_lim[row][col]) break; } return da9052_reg_update(bat->da9052, DA9052_ISET_REG, DA9052_ISET_USB_MASK, col); } static int da9052_bat_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { int ret; int illegal; struct da9052_battery *bat = container_of(psy, struct da9052_battery, psy); ret = da9052_bat_check_presence(bat, &illegal); if (ret < 0) return ret; if (illegal && psp != POWER_SUPPLY_PROP_PRESENT) return -ENODEV; switch (psp) { case POWER_SUPPLY_PROP_STATUS: ret = da9052_bat_check_status(bat, &val->intval); break; case POWER_SUPPLY_PROP_ONLINE: val->intval = (bat->charger_type == DA9052_NOCHARGER) ? 0 : 1; break; case POWER_SUPPLY_PROP_PRESENT: ret = da9052_bat_check_presence(bat, &val->intval); break; case POWER_SUPPLY_PROP_HEALTH: ret = da9052_bat_check_health(bat, &val->intval); break; case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: val->intval = DA9052_BAT_CUTOFF_VOLT * 1000; break; case POWER_SUPPLY_PROP_VOLTAGE_AVG: ret = da9052_bat_read_volt(bat, &val->intval); break; case POWER_SUPPLY_PROP_CURRENT_AVG: ret = da9052_read_chg_current(bat, &val->intval); break; case POWER_SUPPLY_PROP_CAPACITY: ret = da9052_bat_read_capacity(bat, &val->intval); break; case POWER_SUPPLY_PROP_TEMP: val->intval = da9052_adc_read_temp(bat->da9052); ret = val->intval; break; case POWER_SUPPLY_PROP_TECHNOLOGY: val->intval = POWER_SUPPLY_TECHNOLOGY_LION; break; default: return -EINVAL; } return ret; } static enum power_supply_property da9052_bat_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, POWER_SUPPLY_PROP_VOLTAGE_AVG, POWER_SUPPLY_PROP_CURRENT_AVG, POWER_SUPPLY_PROP_CAPACITY, POWER_SUPPLY_PROP_TEMP, POWER_SUPPLY_PROP_TECHNOLOGY, }; static struct power_supply template_battery = { .name = "da9052-bat", .type = POWER_SUPPLY_TYPE_BATTERY, .properties = da9052_bat_props, .num_properties = ARRAY_SIZE(da9052_bat_props), .get_property = da9052_bat_get_property, }; static char *da9052_bat_irqs[] = { "BATT TEMP", "DCIN DET", "DCIN REM", "VBUS DET", "VBUS REM", "CHG END", }; static int da9052_bat_irq_bits[] = { DA9052_IRQ_TBAT, DA9052_IRQ_DCIN, DA9052_IRQ_DCINREM, DA9052_IRQ_VBUS, DA9052_IRQ_VBUSREM, DA9052_IRQ_CHGEND, }; static s32 __devinit da9052_bat_probe(struct platform_device *pdev) { struct da9052_pdata *pdata; struct da9052_battery *bat; int ret; int i; bat = kzalloc(sizeof(struct da9052_battery), GFP_KERNEL); if (!bat) return -ENOMEM; bat->da9052 = dev_get_drvdata(pdev->dev.parent); bat->psy = template_battery; bat->charger_type = DA9052_NOCHARGER; bat->status = POWER_SUPPLY_STATUS_UNKNOWN; bat->health = POWER_SUPPLY_HEALTH_UNKNOWN; bat->nb.notifier_call = da9052_USB_current_notifier; pdata = bat->da9052->dev->platform_data; if (pdata != NULL && pdata->use_for_apm) bat->psy.use_for_apm = pdata->use_for_apm; else bat->psy.use_for_apm = 1; for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) { ret = da9052_request_irq(bat->da9052, da9052_bat_irq_bits[i], da9052_bat_irqs[i], da9052_bat_irq, bat); if (ret != 0) { dev_err(bat->da9052->dev, "DA9052 failed to request %s IRQ: %d\n", da9052_bat_irqs[i], ret); goto err; } } ret = power_supply_register(&pdev->dev, &bat->psy); if (ret) goto err; platform_set_drvdata(pdev, bat); return 0; err: while (--i >= 0) da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat); kfree(bat); return ret; } static int __devexit da9052_bat_remove(struct platform_device *pdev) { int i; struct da9052_battery *bat = platform_get_drvdata(pdev); for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat); power_supply_unregister(&bat->psy); kfree(bat); return 0; } static struct platform_driver da9052_bat_driver = { .probe = da9052_bat_probe, .remove = __devexit_p(da9052_bat_remove), .driver = { .name = "da9052-bat", .owner = THIS_MODULE, }, }; module_platform_driver(da9052_bat_driver); MODULE_DESCRIPTION("DA9052 BAT Device Driver"); MODULE_AUTHOR("David Dajun Chen "); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:da9052-bat");