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path: root/drivers/gnss/sirf.c
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Diffstat (limited to 'drivers/gnss/sirf.c')
-rw-r--r--drivers/gnss/sirf.c256
1 files changed, 212 insertions, 44 deletions
diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c
index 226f6e6fe01b..effed3a8d398 100644
--- a/drivers/gnss/sirf.c
+++ b/drivers/gnss/sirf.c
@@ -25,31 +25,83 @@
#define SIRF_ON_OFF_PULSE_TIME 100
#define SIRF_ACTIVATE_TIMEOUT 200
#define SIRF_HIBERNATE_TIMEOUT 200
+/*
+ * If no data arrives for this time, we assume that the chip is off.
+ * REVISIT: The report cycle is configurable and can be several minutes long,
+ * so this will only work reliably if the report cycle is set to a reasonable
+ * low value. Also power saving settings (like send data only on movement)
+ * might things work even worse.
+ * Workaround might be to parse shutdown or bootup messages.
+ */
+#define SIRF_REPORT_CYCLE 2000
struct sirf_data {
struct gnss_device *gdev;
struct serdev_device *serdev;
speed_t speed;
struct regulator *vcc;
+ struct regulator *lna;
struct gpio_desc *on_off;
struct gpio_desc *wakeup;
int irq;
bool active;
+
+ struct mutex gdev_mutex;
+ bool open;
+
+ struct mutex serdev_mutex;
+ int serdev_count;
+
wait_queue_head_t power_wait;
};
+static int sirf_serdev_open(struct sirf_data *data)
+{
+ int ret = 0;
+
+ mutex_lock(&data->serdev_mutex);
+ if (++data->serdev_count == 1) {
+ ret = serdev_device_open(data->serdev);
+ if (ret) {
+ data->serdev_count--;
+ goto out_unlock;
+ }
+
+ serdev_device_set_baudrate(data->serdev, data->speed);
+ serdev_device_set_flow_control(data->serdev, false);
+ }
+
+out_unlock:
+ mutex_unlock(&data->serdev_mutex);
+
+ return ret;
+}
+
+static void sirf_serdev_close(struct sirf_data *data)
+{
+ mutex_lock(&data->serdev_mutex);
+ if (--data->serdev_count == 0)
+ serdev_device_close(data->serdev);
+ mutex_unlock(&data->serdev_mutex);
+}
+
static int sirf_open(struct gnss_device *gdev)
{
struct sirf_data *data = gnss_get_drvdata(gdev);
struct serdev_device *serdev = data->serdev;
int ret;
- ret = serdev_device_open(serdev);
- if (ret)
- return ret;
+ mutex_lock(&data->gdev_mutex);
+ data->open = true;
+ mutex_unlock(&data->gdev_mutex);
- serdev_device_set_baudrate(serdev, data->speed);
- serdev_device_set_flow_control(serdev, false);
+ ret = sirf_serdev_open(data);
+ if (ret) {
+ mutex_lock(&data->gdev_mutex);
+ data->open = false;
+ mutex_unlock(&data->gdev_mutex);
+ return ret;
+ }
ret = pm_runtime_get_sync(&serdev->dev);
if (ret < 0) {
@@ -61,7 +113,11 @@ static int sirf_open(struct gnss_device *gdev)
return 0;
err_close:
- serdev_device_close(serdev);
+ sirf_serdev_close(data);
+
+ mutex_lock(&data->gdev_mutex);
+ data->open = false;
+ mutex_unlock(&data->gdev_mutex);
return ret;
}
@@ -71,9 +127,13 @@ static void sirf_close(struct gnss_device *gdev)
struct sirf_data *data = gnss_get_drvdata(gdev);
struct serdev_device *serdev = data->serdev;
- serdev_device_close(serdev);
+ sirf_serdev_close(data);
pm_runtime_put(&serdev->dev);
+
+ mutex_lock(&data->gdev_mutex);
+ data->open = false;
+ mutex_unlock(&data->gdev_mutex);
}
static int sirf_write_raw(struct gnss_device *gdev, const unsigned char *buf,
@@ -105,8 +165,19 @@ static int sirf_receive_buf(struct serdev_device *serdev,
{
struct sirf_data *data = serdev_device_get_drvdata(serdev);
struct gnss_device *gdev = data->gdev;
+ int ret = 0;
+
+ if (!data->wakeup && !data->active) {
+ data->active = true;
+ wake_up_interruptible(&data->power_wait);
+ }
+
+ mutex_lock(&data->gdev_mutex);
+ if (data->open)
+ ret = gnss_insert_raw(gdev, buf, count);
+ mutex_unlock(&data->gdev_mutex);
- return gnss_insert_raw(gdev, buf, count);
+ return ret;
}
static const struct serdev_device_ops sirf_serdev_ops = {
@@ -125,17 +196,45 @@ static irqreturn_t sirf_wakeup_handler(int irq, void *dev_id)
if (ret < 0)
goto out;
- data->active = !!ret;
+ data->active = ret;
wake_up_interruptible(&data->power_wait);
out:
return IRQ_HANDLED;
}
+static int sirf_wait_for_power_state_nowakeup(struct sirf_data *data,
+ bool active,
+ unsigned long timeout)
+{
+ int ret;
+
+ /* Wait for state change (including any shutdown messages). */
+ msleep(timeout);
+
+ /* Wait for data reception or timeout. */
+ data->active = false;
+ ret = wait_event_interruptible_timeout(data->power_wait,
+ data->active, msecs_to_jiffies(SIRF_REPORT_CYCLE));
+ if (ret < 0)
+ return ret;
+
+ if (ret > 0 && !active)
+ return -ETIMEDOUT;
+
+ if (ret == 0 && active)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
static int sirf_wait_for_power_state(struct sirf_data *data, bool active,
unsigned long timeout)
{
int ret;
+ if (!data->wakeup)
+ return sirf_wait_for_power_state_nowakeup(data, active, timeout);
+
ret = wait_event_interruptible_timeout(data->power_wait,
data->active == active, msecs_to_jiffies(timeout));
if (ret < 0)
@@ -168,21 +267,22 @@ static int sirf_set_active(struct sirf_data *data, bool active)
else
timeout = SIRF_HIBERNATE_TIMEOUT;
+ if (!data->wakeup) {
+ ret = sirf_serdev_open(data);
+ if (ret)
+ return ret;
+ }
+
do {
sirf_pulse_on_off(data);
ret = sirf_wait_for_power_state(data, active, timeout);
- if (ret < 0) {
- if (ret == -ETIMEDOUT)
- continue;
+ } while (ret == -ETIMEDOUT && retries--);
- return ret;
- }
+ if (!data->wakeup)
+ sirf_serdev_close(data);
- break;
- } while (retries--);
-
- if (retries < 0)
- return -ETIMEDOUT;
+ if (ret)
+ return ret;
return 0;
}
@@ -190,21 +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);
+
+ if (ret)
+ return ret;
+
+ ret = regulator_disable(data->lna);
+ if (ret)
+ goto err_reenable;
- return sirf_set_active(data, false);
+ 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;
+
+ 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 sirf_set_active(data, true);
+ return ret;
}
static int __maybe_unused sirf_suspend(struct device *dev)
@@ -275,6 +414,8 @@ static int sirf_probe(struct serdev_device *serdev)
data->serdev = serdev;
data->gdev = gdev;
+ mutex_init(&data->gdev_mutex);
+ mutex_init(&data->serdev_mutex);
init_waitqueue_head(&data->power_wait);
serdev_device_set_drvdata(serdev, data);
@@ -290,6 +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))
@@ -301,39 +448,53 @@ static int sirf_probe(struct serdev_device *serdev)
if (IS_ERR(data->wakeup))
goto err_put_device;
- /*
- * Configurations where WAKEUP has been left not connected,
- * are currently not supported.
- */
- if (!data->wakeup) {
- dev_err(dev, "no wakeup gpio specified\n");
- ret = -ENODEV;
+ ret = regulator_enable(data->vcc);
+ if (ret)
goto err_put_device;
- }
+
+ /* Wait for chip to boot into hibernate mode. */
+ msleep(SIRF_BOOT_DELAY);
}
if (data->wakeup) {
- ret = gpiod_to_irq(data->wakeup);
+ ret = gpiod_get_value_cansleep(data->wakeup);
if (ret < 0)
- goto err_put_device;
+ goto err_disable_vcc;
+ data->active = ret;
+ ret = gpiod_to_irq(data->wakeup);
+ if (ret < 0)
+ goto err_disable_vcc;
data->irq = ret;
- ret = devm_request_threaded_irq(dev, data->irq, NULL,
- sirf_wakeup_handler,
+ ret = request_threaded_irq(data->irq, NULL, sirf_wakeup_handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"wakeup", data);
if (ret)
- goto err_put_device;
+ goto err_disable_vcc;
}
if (data->on_off) {
- ret = regulator_enable(data->vcc);
- if (ret)
- goto err_put_device;
+ if (!data->wakeup) {
+ data->active = false;
- /* Wait for chip to boot into hibernate mode */
- msleep(SIRF_BOOT_DELAY);
+ ret = sirf_serdev_open(data);
+ if (ret)
+ goto err_disable_vcc;
+
+ msleep(SIRF_REPORT_CYCLE);
+ sirf_serdev_close(data);
+ }
+
+ /* Force hibernate mode if already active. */
+ if (data->active) {
+ ret = sirf_set_active(data, false);
+ if (ret) {
+ dev_err(dev, "failed to set hibernate mode: %d\n",
+ ret);
+ goto err_free_irq;
+ }
+ }
}
if (IS_ENABLED(CONFIG_PM)) {
@@ -342,7 +503,7 @@ static int sirf_probe(struct serdev_device *serdev)
} else {
ret = sirf_runtime_resume(dev);
if (ret < 0)
- goto err_disable_vcc;
+ goto err_free_irq;
}
ret = gnss_register_device(gdev);
@@ -356,6 +517,9 @@ err_disable_rpm:
pm_runtime_disable(dev);
else
sirf_runtime_suspend(dev);
+err_free_irq:
+ if (data->wakeup)
+ free_irq(data->irq, data);
err_disable_vcc:
if (data->on_off)
regulator_disable(data->vcc);
@@ -376,6 +540,9 @@ static void sirf_remove(struct serdev_device *serdev)
else
sirf_runtime_suspend(&serdev->dev);
+ if (data->wakeup)
+ free_irq(data->irq, data);
+
if (data->on_off)
regulator_disable(data->vcc);
@@ -386,6 +553,7 @@ static void sirf_remove(struct serdev_device *serdev)
static const struct of_device_id sirf_of_match[] = {
{ .compatible = "fastrax,uc430" },
{ .compatible = "linx,r4" },
+ { .compatible = "wi2wi,w2sg0004" },
{ .compatible = "wi2wi,w2sg0008i" },
{ .compatible = "wi2wi,w2sg0084i" },
{},