On 16.09.2015 02:58, Andreas Dannenberg wrote:
> A new optional device property called "ti,ovp-voltage" is introduced to
> allow configuring the input over voltage protection setting.
>
> This commit also adds the basic sysfs support for custom properties
> which is being used to allow userspace to read the current ovp-voltage
> setting.
>
> Signed-off-by: Andreas Dannenberg <[email protected]>
> ---
> drivers/power/bq24257_charger.c | 67
> +++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 64 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/power/bq24257_charger.c b/drivers/power/bq24257_charger.c
> index d7488cf..47af858 100644
> --- a/drivers/power/bq24257_charger.c
> +++ b/drivers/power/bq24257_charger.c
> @@ -75,6 +75,7 @@ struct bq24257_init_data {
> u8 vbat; /* regulation voltage */
> u8 iterm; /* termination current */
> u8 in_ilimit; /* input current limit */
> + u8 vovp; /* over voltage protection voltage */
> };
>
> struct bq24257_state {
> @@ -198,6 +199,13 @@ static const u32 bq24257_iilimit_map[] = {
>
> #define BQ24257_IILIMIT_MAP_SIZE ARRAY_SIZE(bq24257_iilimit_map)
>
> +static const u32 bq24257_vovp_map[] = {
> + 6000000, 6500000, 7000000, 8000000, 9000000, 9500000, 10000000,
> + 10500000
> +};
> +
> +#define BQ24257_VOVP_MAP_SIZE ARRAY_SIZE(bq24257_vovp_map)
> +
> static int bq24257_field_read(struct bq24257_device *bq,
> enum bq24257_fields field_id)
> {
> @@ -413,6 +421,17 @@ enum bq24257_in_ilimit {
> IILIMIT_NONE,
> };
>
> +enum bq24257_vovp {
> + VOVP_6000,
> + VOVP_6500,
> + VOVP_7000,
> + VOVP_8000,
> + VOVP_9000,
> + VOVP_9500,
> + VOVP_10000,
> + VOVP_10500
> +};
What is the purpose of this enum? It is duplicating values from the map
(so you can make a mistake in its order) but actually is not used. I
don't see benefit.
> +
> enum bq24257_port_type {
> PORT_TYPE_DCP, /* Dedicated Charging Port */
> PORT_TYPE_CDP, /* Charging Downstream Port */
> @@ -594,7 +613,8 @@ static int bq24257_hw_init(struct bq24257_device *bq)
> } init_data[] = {
> {F_ICHG, bq->init_data.ichg},
> {F_VBAT, bq->init_data.vbat},
> - {F_ITERM, bq->init_data.iterm}
> + {F_ITERM, bq->init_data.iterm},
> + {F_VOVP, bq->init_data.vovp},
> };
>
> /*
> @@ -664,6 +684,28 @@ static const struct power_supply_desc
> bq24257_power_supply_desc = {
> .get_property = bq24257_power_supply_get_property,
> };
>
> +static ssize_t bq24257_show_ovp_voltage(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct power_supply *psy = dev_get_drvdata(dev);
> + struct bq24257_device *bq = power_supply_get_drvdata(psy);
> +
> + return scnprintf(buf, PAGE_SIZE, "%d\n",
"%u", you are printing u32.
> + bq24257_vovp_map[bq->init_data.vovp]);
> +}
> +
> +static DEVICE_ATTR(ovp_voltage, S_IRUGO, bq24257_show_ovp_voltage, NULL);
> +
> +static struct attribute *bq24257_charger_attr[] = {
> + &dev_attr_ovp_voltage.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group bq24257_attr_group = {
> + .attrs = bq24257_charger_attr,
> +};
> +
> static int bq24257_power_supply_init(struct bq24257_device *bq)
> {
> struct power_supply_config psy_cfg = { .drv_data = bq, };
> @@ -750,6 +792,15 @@ static int bq24257_fw_probe(struct bq24257_device *bq)
> BQ24257_IILIMIT_MAP_SIZE);
> }
>
> + ret = device_property_read_u32(bq->dev, "ti,ovp-voltage",
> + &property);
> + if (ret < 0)
> + bq->init_data.vovp = VOVP_6500;
> + else
> + bq->init_data.vovp = bq24257_find_idx(property,
> + bq24257_vovp_map,
> + BQ24257_VOVP_MAP_SIZE);
> +
> return 0;
> }
>
> @@ -889,10 +940,18 @@ static int bq24257_probe(struct i2c_client *client,
> return ret;
>
> ret = bq24257_power_supply_init(bq);
> - if (ret < 0)
> + if (ret < 0) {
> dev_err(dev, "Failed to register power supply\n");
> + return ret;
> + }
>
> - return ret;
> + ret = sysfs_create_group(&bq->charger->dev.kobj, &bq24257_attr_group);
> + if (ret < 0) {
> + dev_err(dev, "Can't create sysfs entries\n");
power_supply_unregister(bq->charger);
or convert in separate patch to devm-like method.
Best regards,
Krzysztof
> + return ret;
> + }
> +
> + return 0;
> }
>
> static int bq24257_remove(struct i2c_client *client)
> @@ -902,6 +961,8 @@ static int bq24257_remove(struct i2c_client *client)
> if (!bq->in_ilimit_autoset_disable)
> cancel_delayed_work_sync(&bq->iilimit_setup_work);
>
> + sysfs_remove_group(&bq->charger->dev.kobj, &bq24257_attr_group);
> +
> power_supply_unregister(bq->charger);
>
> bq24257_field_write(bq, F_RESET, 1); /* reset to defaults */
>
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