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authorNick Crews <ncrews@chromium.org>2019-02-08 17:37:19 -0700
committerEnric Balletbo i Serra <enric.balletbo@collabora.com>2019-02-21 21:36:53 +0100
commit0d2f2a3da1f2a9ebeb66bb03073dd149fccf1bdd (patch)
tree1fb3c4114555aae7a7831adff13aa3f0ffd3f782 /drivers/platform
parentb787bb126cbcd73754bcbc055ae9f804ac576e4a (diff)
downloadlinux-0d2f2a3da1f2a9ebeb66bb03073dd149fccf1bdd.tar.bz2
platform/chrome: wilco_ec: Add RTC driver
This Embedded Controller has an internal RTC that is exposed as a standard RTC class driver with read/write functionality. The driver is added to the drivers/rtc/ so that the maintainer of that directory will be able to comment on this change, as that maintainer is the expert on this system. In addition, the driver code is called indirectly after a corresponding device is registered from core.c, as opposed to core.c registering the driver callbacks directly. To test: > hwclock --show --rtc /dev/rtc1 2007-12-31 16:01:20.460959-08:00 > hwclock --systohc --rtc /dev/rtc1 > hwclock --show --rtc /dev/rtc1 2018-11-29 17:08:00.780793-08:00 > hwclock --show --rtc /dev/rtc1 2007-12-31 16:01:20.460959-08:00 > hwclock --systohc --rtc /dev/rtc1 > hwclock --show --rtc /dev/rtc1 2018-11-29 17:08:00.780793-08:00 Signed-off-by: Duncan Laurie <dlaurie@google.com> Signed-off-by: Nick Crews <ncrews@chromium.org> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> [Fix the sparse warning: symbol 'wilco_ec_rtc_read/write' was not declared] Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/chrome/wilco_ec/core.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/platform/chrome/wilco_ec/core.c b/drivers/platform/chrome/wilco_ec/core.c
index af5fd288b63b..05e1e2be1c91 100644
--- a/drivers/platform/chrome/wilco_ec/core.c
+++ b/drivers/platform/chrome/wilco_ec/core.c
@@ -42,6 +42,7 @@ static int wilco_ec_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct wilco_ec_device *ec;
+ int ret;
ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL);
if (!ec)
@@ -78,13 +79,30 @@ static int wilco_ec_probe(struct platform_device *pdev)
PLATFORM_DEVID_AUTO,
NULL, 0);
+ /* Register a child device that will be found by the RTC driver. */
+ ec->rtc_pdev = platform_device_register_data(dev, "rtc-wilco-ec",
+ PLATFORM_DEVID_AUTO,
+ NULL, 0);
+ if (IS_ERR(ec->rtc_pdev)) {
+ dev_err(dev, "Failed to create RTC platform device\n");
+ ret = PTR_ERR(ec->rtc_pdev);
+ goto unregister_debugfs;
+ }
+
return 0;
+
+unregister_debugfs:
+ if (ec->debugfs_pdev)
+ platform_device_unregister(ec->debugfs_pdev);
+ cros_ec_lpc_mec_destroy();
+ return ret;
}
static int wilco_ec_remove(struct platform_device *pdev)
{
struct wilco_ec_device *ec = platform_get_drvdata(pdev);
+ platform_device_unregister(ec->rtc_pdev);
if (ec->debugfs_pdev)
platform_device_unregister(ec->debugfs_pdev);