diff options
| -rw-r--r-- | drivers/iio/adc/rockchip_saradc.c | 47 |
1 files changed, 40 insertions, 7 deletions
diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c index f3eb8d2e50dc..a237fe469a30 100644 --- a/drivers/iio/adc/rockchip_saradc.c +++ b/drivers/iio/adc/rockchip_saradc.c @@ -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 @@ out: 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); } |