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iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe

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Add voltage notifier, no need to query regulator voltage for
every saradc read, just get regulator voltage once at probe.

Signed-off-by: David Wu <david.wu@rock-chips.com>
Signed-off-by: Simon Xue <xxm@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20210810011007.54066-1-xxm@rock-chips.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
David Wu 2021-08-10 09:10:07 +08:00 committed by Jonathan Cameron
parent b76d26d69e
commit cabd6e9cf2
1 changed files with 40 additions and 7 deletions
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47
drivers/iio/adc/rockchip_saradc.c
View file

@ -49,10 +49,12 @@ struct rockchip_saradc {
struct clk *clk;
struct completion completion;
struct regulator *vref;
int uv_vref;
struct reset_control *reset;
const struct rockchip_saradc_data *data;
u16 last_val;
const struct iio_chan_spec *last_chan;
struct notifier_block nb;
};
static void rockchip_saradc_power_down(struct rockchip_saradc *info)
@ -105,13 +107,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev,
mutex_unlock(&indio_dev->mlock);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
ret = regulator_get_voltage(info->vref);
if (ret < 0) {
dev_err(&indio_dev->dev, "failed to get voltage\n");
return ret;
}
*val = ret / 1000;
*val = info->uv_vref / 1000;
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
default:
@ -298,6 +294,26 @@ static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
return IRQ_HANDLED;
}
static int rockchip_saradc_volt_notify(struct notifier_block *nb,
unsigned long event,
void *data)
{
struct rockchip_saradc *info =
container_of(nb, struct rockchip_saradc, nb);
if (event & REGULATOR_EVENT_VOLTAGE_CHANGE)
info->uv_vref = (unsigned long)data;
return NOTIFY_OK;
}
static void rockchip_saradc_regulator_unreg_notifier(void *data)
{
struct rockchip_saradc *info = data;
regulator_unregister_notifier(info->vref, &info->nb);
}
static int rockchip_saradc_probe(struct platform_device *pdev)
{
struct rockchip_saradc *info = NULL;
@ -410,6 +426,12 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
return ret;
}
ret = regulator_get_voltage(info->vref);
if (ret < 0)
return ret;
info->uv_vref = ret;
ret = clk_prepare_enable(info->pclk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to enable pclk\n");
@ -450,6 +472,17 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
if (ret)
return ret;
info->nb.notifier_call = rockchip_saradc_volt_notify;
ret = regulator_register_notifier(info->vref, &info->nb);
if (ret)
return ret;
ret = devm_add_action_or_reset(&pdev->dev,
rockchip_saradc_regulator_unreg_notifier,
info);
if (ret)
return ret;
return devm_iio_device_register(&pdev->dev, indio_dev);
}