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gnss: sirf: add a separate supply for a lna 

Devices might have a separate lna between antenna input of the gps
chip and the antenna which might have a separate supply.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Signed-off-by: Johan Hovold <johan@kernel.org>
hifive-unleashed-5.1
Andreas Kemnade 2019-01-24 07:34:38 +01:00 committed by Johan Hovold
parent 176f011bda
commit 8fafef42c7
1 changed files with 52 additions and 6 deletions
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58
drivers/gnss/sirf.c
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@ -40,6 +40,7 @@ struct sirf_data {
struct serdev_device *serdev;
speed_t speed;
struct regulator *vcc;
struct regulator *lna;
struct gpio_desc *on_off;
struct gpio_desc *wakeup;
int irq;
@ -289,21 +290,60 @@ static int sirf_set_active(struct sirf_data *data, bool active)
static int sirf_runtime_suspend(struct device *dev)
{
struct sirf_data *data = dev_get_drvdata(dev);
int ret2;
int ret;
if (!data->on_off)
return regulator_disable(data->vcc);
if (data->on_off)
ret = sirf_set_active(data, false);
else
ret = regulator_disable(data->vcc);
return sirf_set_active(data, false);
if (ret)
return ret;
ret = regulator_disable(data->lna);
if (ret)
goto err_reenable;
return 0;
err_reenable:
if (data->on_off)
ret2 = sirf_set_active(data, true);
else
ret2 = regulator_enable(data->vcc);
if (ret2)
dev_err(dev,
"failed to reenable power on failed suspend: %d\n",
ret2);
return ret;
}
static int sirf_runtime_resume(struct device *dev)
{
struct sirf_data *data = dev_get_drvdata(dev);
int ret;
if (!data->on_off)
return regulator_enable(data->vcc);
ret = regulator_enable(data->lna);
if (ret)
return ret;
return sirf_set_active(data, true);
if (data->on_off)
ret = sirf_set_active(data, true);
else
ret = regulator_enable(data->vcc);
if (ret)
goto err_disable_lna;
return 0;
err_disable_lna:
regulator_disable(data->lna);
return ret;
}
static int __maybe_unused sirf_suspend(struct device *dev)
@ -391,6 +431,12 @@ static int sirf_probe(struct serdev_device *serdev)
goto err_put_device;
}
data->lna = devm_regulator_get(dev, "lna");
if (IS_ERR(data->lna)) {
ret = PTR_ERR(data->lna);
goto err_put_device;
}
data->on_off = devm_gpiod_get_optional(dev, "sirf,onoff",
GPIOD_OUT_LOW);
if (IS_ERR(data->on_off))