* Nishanth Menon <n...@ti.com> [140528 14:48]: > TWL4030's Battery Charger seems to be designed for non-hotpluggable > batteries. > > If battery is not present in the system, BATSTS is always set with the > expectation that software will take actions to move to a required safe > state (could be power down or disable various charger paths). > > It does not seem possible even by manipulating the edge detection > of the event (using BCIEDR2 register) to have a consistent hotplug > handling. This seems to be the result of BATSTS interrupt generated > when the thermistor of the battery pack is disconnected from the > dedicated ADIN1 pin. Clearing the status just results in the status > being regenerated by the monitoring ADC(MADC) and disabling the > edges of event just makes hotplug no longer function. The only > other option is to disable the detection of the MADC by disabling > BCIMFEN4::BATSTSMCHGEN (battery presence detector) - but then, we can > never again detect battery reconnection. > > So, detect battery presence based on precharge(which is hardware > automatic state) or default main charger configuration at the time of > probe and enable charger logic only if battery was present. > > Reported-by: Russell King <li...@arm.linux.org.uk> > Tested-by: Tony Lindgren <t...@atomide.com> > Signed-off-by: Nishanth Menon <n...@ti.com>
Dmitry, can we please get this first patch merged? This is needed on some omap3 platforms for DT based booting when no battery is present. Only the second patch in this series is still being discussed AFAIK. Regards, Tony > --- > V2: just a rebase, picked up tony's tested-by, minor formatting fix > V1: https://patchwork.kernel.org/patch/4124751/ > drivers/power/twl4030_charger.c | 44 > ++++++++++++++++++++++++++++++++++++++- > 1 file changed, 43 insertions(+), 1 deletion(-) > > diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c > index f141088..2598c58 100644 > --- a/drivers/power/twl4030_charger.c > +++ b/drivers/power/twl4030_charger.c > @@ -28,10 +28,13 @@ > #define TWL4030_BCIICHG 0x08 > #define TWL4030_BCIVAC 0x0a > #define TWL4030_BCIVBUS 0x0c > +#define TWL4030_BCIMFSTS3 0x0F > #define TWL4030_BCIMFSTS4 0x10 > #define TWL4030_BCICTL1 0x23 > #define TWL4030_BB_CFG 0x12 > > +#define TWL4030_BCIMFSTS1 0x01 > + > #define TWL4030_BCIAUTOWEN BIT(5) > #define TWL4030_CONFIG_DONE BIT(4) > #define TWL4030_BCIAUTOUSB BIT(1) > @@ -52,6 +55,9 @@ > #define TWL4030_BBISEL_500uA 0x02 > #define TWL4030_BBISEL_1000uA 0x03 > > +#define TWL4030_BATSTSPCHG BIT(2) > +#define TWL4030_BATSTSMCHG BIT(6) > + > /* BCI interrupts */ > #define TWL4030_WOVF BIT(0) /* Watchdog overflow */ > #define TWL4030_TMOVF BIT(1) /* Timer overflow */ > @@ -145,6 +151,35 @@ static int twl4030bci_read_adc_val(u8 reg) > } > > /* > + * Check if Battery Pack was present > + */ > +static int twl4030_is_battery_present(struct twl4030_bci *bci) > +{ > + int ret; > + u8 val = 0; > + > + /* Battery presence in Main charge? */ > + ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3); > + if (ret) > + return ret; > + if (val & TWL4030_BATSTSMCHG) > + return 0; > + > + /* > + * OK, It could be that bootloader did not enable main charger, > + * pre-charge is h/w auto. So, Battery presence in Pre-charge? > + */ > + ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val, > + TWL4030_BCIMFSTS1); > + if (ret) > + return ret; > + if (val & TWL4030_BATSTSPCHG) > + return 0; > + > + return -ENODEV; > +} > + > +/* > * Check if VBUS power is present > */ > static int twl4030_bci_have_vbus(struct twl4030_bci *bci) > @@ -541,8 +576,14 @@ static int __init twl4030_bci_probe(struct > platform_device *pdev) > bci->irq_chg = platform_get_irq(pdev, 0); > bci->irq_bci = platform_get_irq(pdev, 1); > > - platform_set_drvdata(pdev, bci); > + /* Only proceed further *IF* battery is physically present */ > + ret = twl4030_is_battery_present(bci); > + if (ret) { > + dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret); > + goto fail_no_battery; > + } > > + platform_set_drvdata(pdev, bci); > bci->ac.name = "twl4030_ac"; > bci->ac.type = POWER_SUPPLY_TYPE_MAINS; > bci->ac.properties = twl4030_charger_props; > @@ -633,6 +674,7 @@ fail_chg_irq: > fail_register_usb: > power_supply_unregister(&bci->ac); > fail_register_ac: > +fail_no_battery: > kfree(bci); > > return ret; > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
