65 lines
1.7 KiB
Diff
65 lines
1.7 KiB
Diff
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From 086e9e79e1ffe10891b83211004dcfa516616fdd Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ond=C5=99ej=20Jirman?= <megi@xff.cz>
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Date: Wed, 23 Oct 2019 05:08:35 +0200
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Subject: [PATCH 032/464] gnss: ubx: Send soft powerdown message on suspend
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Signed-off-by: Ondrej Jirman <megi@xff.cz>
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---
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drivers/gnss/ubx.c | 35 +++++++++++++++++++++++++++++++++++
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1 file changed, 35 insertions(+)
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diff --git a/drivers/gnss/ubx.c b/drivers/gnss/ubx.c
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index c951be202ca2..6f09229da095 100644
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--- a/drivers/gnss/ubx.c
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+++ b/drivers/gnss/ubx.c
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@@ -33,11 +33,46 @@ static int ubx_set_active(struct gnss_serial *gserial)
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return 0;
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}
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+// RXM-PMREQ
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+static const u8 ubx_suspend_packet[] = {
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+ 0xb5, 0x62, // 'ub'
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+ 0x02, 0x41, // message class and id
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+ 0x08, 0x00, // message length
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+ 0x00, 0x00, 0x00, 0x00, // duration (0 == infinite)
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+ 0x02, 0x00, 0x00, 0x00, // flags (backup)
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+ 0x4d, 0x3b, // checksum
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+};
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+
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static int ubx_set_standby(struct gnss_serial *gserial)
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{
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struct ubx_data *data = gnss_serial_get_drvdata(gserial);
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int ret;
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+#if 0
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+ struct serdev_device *serdev = gserial->serdev;
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+
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+ // we can't know what state the device is in, so first make sure
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+ // it's woken up by writing a zero byte to it and then suspend it
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+ // for sure
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+
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+ ret = serdev_device_write(serdev, "", 1, MAX_SCHEDULE_TIMEOUT);
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+ if (ret < 0)
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+ return ret;
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+
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+ serdev_device_wait_until_sent(serdev, 0);
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+
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+ // wait for wakeup
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+ mdelay(100);
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+
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+ ret = serdev_device_write(serdev, ubx_suspend_packet,
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+ sizeof(ubx_suspend_packet),
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+ MAX_SCHEDULE_TIMEOUT);
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+ if (ret < 0 || ret < sizeof(ubx_suspend_packet))
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+ return ret;
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+
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+ serdev_device_wait_until_sent(serdev, 0);
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+#endif
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+
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ret = regulator_disable(data->vcc);
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if (ret)
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return ret;
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--
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2.34.1
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