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Date: Mon, 13 Aug 2012 11:16:17 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Ramakrishna Pallala <ramakrishna.pallala@...el.com>
Cc: linux-kernel@...r.kernel.org,
Anton Vorontsov <cbouatmailru@...il.com>,
Anton Vorontsov <anton.vorontsov@...aro.org>
Subject: Re: [PATCH] smb347_charger: fix battery status reporting logic for
charger faults
On Fri, Jul 20, 2012 at 07:22:48PM +0530, Ramakrishna Pallala wrote:
> This patch checks for charger status register for determining the
> battery charging status and reports Discharing/Charging/Not Charging/Full
> accordingly.
>
> This patch also adds the interrupt support for Safety Timer Expiration.
> This interrupt is helpful in debugging the cause for charger fault.
>
> Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@...el.com>
Few nitpicks below, otherwise looks good to me.
> ---
> drivers/power/smb347-charger.c | 96 +++++++++++++++++++++++++++++++++------
> 1 files changed, 81 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/power/smb347-charger.c b/drivers/power/smb347-charger.c
> index 332dd01..b6a8c59 100644
> --- a/drivers/power/smb347-charger.c
> +++ b/drivers/power/smb347-charger.c
> @@ -80,6 +80,7 @@
> #define CFG_FAULT_IRQ_DCIN_UV BIT(2)
> #define CFG_STATUS_IRQ 0x0d
> #define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
> +#define CFG_STATUS_IRQ_CHARGE_TIMEOUT BIT(7)
> #define CFG_ADDRESS 0x0e
>
> /* Command registers */
> @@ -96,6 +97,9 @@
> #define IRQSTAT_C_TERMINATION_STAT BIT(0)
> #define IRQSTAT_C_TERMINATION_IRQ BIT(1)
> #define IRQSTAT_C_TAPER_IRQ BIT(3)
> +#define IRQSTAT_D 0x38
> +#define IRQSTAT_D_CHARGE_TIMEOUT_STAT BIT(2)
> +#define IRQSTAT_D_CHARGE_TIMEOUT_IRQ BIT(3)
> #define IRQSTAT_E 0x39
> #define IRQSTAT_E_USBIN_UV_STAT BIT(0)
> #define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
> @@ -109,8 +113,10 @@
> #define STAT_B 0x3c
> #define STAT_C 0x3d
> #define STAT_C_CHG_ENABLED BIT(0)
> +#define STAT_C_HOLDOFF_STAT BIT(3)
> #define STAT_C_CHG_MASK 0x06
> #define STAT_C_CHG_SHIFT 1
> +#define STAT_C_CHG_TERM BIT(5)
> #define STAT_C_CHARGER_ERROR BIT(6)
> #define STAT_E 0x3f
>
> @@ -701,7 +707,7 @@ fail:
> static irqreturn_t smb347_interrupt(int irq, void *data)
> {
> struct smb347_charger *smb = data;
> - unsigned int stat_c, irqstat_e, irqstat_c;
> + unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
> bool handled = false;
> int ret;
>
> @@ -717,6 +723,12 @@ static irqreturn_t smb347_interrupt(int irq, void *data)
> return IRQ_NONE;
> }
>
> + ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
> + if (ret < 0) {
> + dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
> + return IRQ_NONE;
> + }
> +
> ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
> if (ret < 0) {
> dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
> @@ -724,13 +736,11 @@ static irqreturn_t smb347_interrupt(int irq, void *data)
> }
>
> /*
> - * If we get charger error we report the error back to user and
> - * disable charging.
> + * If we get charger error we report the error back to user.
> + * If the error is recovered charging will resume again.
> */
> if (stat_c & STAT_C_CHARGER_ERROR) {
> - dev_err(smb->dev, "error in charger, disabling charging\n");
> -
> - smb347_charging_disable(smb);
> + dev_err(smb->dev, "charging stopped due to charger error\n");
> power_supply_changed(&smb->battery);
> handled = true;
> }
> @@ -743,6 +753,20 @@ static irqreturn_t smb347_interrupt(int irq, void *data)
> if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
> if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
> power_supply_changed(&smb->battery);
> + dev_dbg(smb->dev, "going to HW maintenance mode\n");
> + handled = true;
> + }
> +
> + /*
> + * If we got a charger timeout INT that means the charge
> + * full is not detected with in charge timeout value.
> + */
> + if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
> + dev_dbg(smb->dev, "total Charge Timeout INT recieved\n");
received not recieved
> +
> + if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
> + dev_warn(smb->dev, "charging stopped due to timeout\n");
> + power_supply_changed(&smb->battery);
> handled = true;
> }
>
> @@ -776,6 +800,7 @@ static int smb347_irq_set(struct smb347_charger *smb, bool enable)
> * Enable/disable interrupts for:
> * - under voltage
> * - termination current reached
> + * - charger timeout
> * - charger error
> */
> ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
> @@ -784,7 +809,8 @@ static int smb347_irq_set(struct smb347_charger *smb, bool enable)
> goto fail;
>
> ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
> - enable ? CFG_STATUS_IRQ_TERMINATION_OR_TAPER : 0);
> + enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
> + CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
> if (ret < 0)
> goto fail;
>
> @@ -988,6 +1014,50 @@ static enum power_supply_property smb347_usb_properties[] = {
> POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
> };
>
> +static int smb347_get_charging_status(struct smb347_charger *smb)
> +{
> + int ret, status;
> + unsigned int val;
> +
> + if (!smb)
> + return -ENODEV;
I don't think the above check is necessary.
> +
> + if (!smb347_is_ps_online(smb))
> + return POWER_SUPPLY_STATUS_DISCHARGING;
> +
> + ret = regmap_read(smb->regmap, STAT_C, &val);
> + if (ret < 0)
> + return ret;
> +
> + if ((val & STAT_C_CHARGER_ERROR) ||
> + (val & STAT_C_HOLDOFF_STAT)) {
> + /* set to NOT CHARGING upon charger error
> + * or charging has stopped.
> + */
Please use block comments defined in Documentation/CodingStyle.
> + status = POWER_SUPPLY_STATUS_NOT_CHARGING;
> + } else {
> + if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
> + /* set to charging if battery is in pre-charge,
> + * fast charge or taper charging mode.
> + */
ditto
> + status = POWER_SUPPLY_STATUS_CHARGING;
> + } else if (val & STAT_C_CHG_TERM) {
> + /* set the status to FULL if battery is not in pre
> + * charge, fast charge or taper charging mode AND
> + * charging is terminated at least once.
> + */
> + status = POWER_SUPPLY_STATUS_FULL;
> + } else {
> + /* in this case no charger error or termination
> + * occured but charging is not in progress!!!
> + */
ditto
> + status = POWER_SUPPLY_STATUS_NOT_CHARGING;
> + }
> + }
> +
> + return status;
> +}
> +
> static int smb347_battery_get_property(struct power_supply *psy,
> enum power_supply_property prop,
> union power_supply_propval *val)
> @@ -1003,14 +1073,10 @@ static int smb347_battery_get_property(struct power_supply *psy,
>
> switch (prop) {
> case POWER_SUPPLY_PROP_STATUS:
> - if (!smb347_is_ps_online(smb)) {
> - val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
> - break;
> - }
> - if (smb347_charging_status(smb))
> - val->intval = POWER_SUPPLY_STATUS_CHARGING;
> - else
> - val->intval = POWER_SUPPLY_STATUS_FULL;
> + ret = smb347_get_charging_status(smb);
> + if (ret < 0)
> + return ret;
> + val->intval = ret;
> break;
>
> case POWER_SUPPLY_PROP_CHARGE_TYPE:
> --
> 1.7.0.4
--
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