diff options
Diffstat (limited to 'drivers/rtc/rtc-cros-ec.c')
| -rw-r--r-- | drivers/rtc/rtc-cros-ec.c | 83 |
1 files changed, 45 insertions, 38 deletions
diff --git a/drivers/rtc/rtc-cros-ec.c b/drivers/rtc/rtc-cros-ec.c index a3ec066d8066..e956505a06fb 100644 --- a/drivers/rtc/rtc-cros-ec.c +++ b/drivers/rtc/rtc-cros-ec.c @@ -5,6 +5,7 @@ // Author: Stephen Barber <smbarber@chromium.org> #include <linux/kernel.h> +#include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_data/cros_ec_commands.h> #include <linux/platform_data/cros_ec_proto.h> @@ -34,21 +35,18 @@ struct cros_ec_rtc { static int cros_ec_rtc_get(struct cros_ec_device *cros_ec, u32 command, u32 *response) { + DEFINE_RAW_FLEX(struct cros_ec_command, msg, data, + sizeof(struct ec_response_rtc)); int ret; - struct { - struct cros_ec_command msg; - struct ec_response_rtc data; - } __packed msg; - memset(&msg, 0, sizeof(msg)); - msg.msg.command = command; - msg.msg.insize = sizeof(msg.data); + msg->command = command; + msg->insize = sizeof(struct ec_response_rtc); - ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg); + ret = cros_ec_cmd_xfer_status(cros_ec, msg); if (ret < 0) return ret; - *response = msg.data.time; + *response = ((struct ec_response_rtc *)msg->data)->time; return 0; } @@ -56,18 +54,15 @@ static int cros_ec_rtc_get(struct cros_ec_device *cros_ec, u32 command, static int cros_ec_rtc_set(struct cros_ec_device *cros_ec, u32 command, u32 param) { + DEFINE_RAW_FLEX(struct cros_ec_command, msg, data, + sizeof(struct ec_response_rtc)); int ret; - struct { - struct cros_ec_command msg; - struct ec_response_rtc data; - } __packed msg; - memset(&msg, 0, sizeof(msg)); - msg.msg.command = command; - msg.msg.outsize = sizeof(msg.data); - msg.data.time = param; + msg->command = command; + msg->outsize = sizeof(struct ec_response_rtc); + ((struct ec_response_rtc *)msg->data)->time = param; - ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg); + ret = cros_ec_cmd_xfer_status(cros_ec, msg); if (ret < 0) return ret; return 0; @@ -182,21 +177,15 @@ static int cros_ec_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, alarm_offset); if (ret < 0) { - if (ret == -EINVAL && alarm_offset >= SECS_PER_DAY) { - /* - * RTC chips on some older Chromebooks can only handle - * alarms up to 24h in the future. Try to set an alarm - * below that limit to avoid suspend failures. - */ - ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, - SECS_PER_DAY - 1); - } - - if (ret < 0) { - dev_err(dev, "error setting alarm in %u seconds: %d\n", - alarm_offset, ret); - return ret; - } + dev_err(dev, "error setting alarm in %u seconds: %d\n", + alarm_offset, ret); + /* + * The EC code returns -EINVAL if the alarm time is too + * far in the future. Convert it to the expected error code. + */ + if (ret == -EINVAL) + ret = -ERANGE; + return ret; } return 0; @@ -342,7 +331,7 @@ static int cros_ec_rtc_probe(struct platform_device *pdev) return ret; } - ret = device_init_wakeup(&pdev->dev, 1); + ret = device_init_wakeup(&pdev->dev, true); if (ret) { dev_err(&pdev->dev, "failed to initialize wakeup\n"); return ret; @@ -355,6 +344,20 @@ static int cros_ec_rtc_probe(struct platform_device *pdev) cros_ec_rtc->rtc->ops = &cros_ec_rtc_ops; cros_ec_rtc->rtc->range_max = U32_MAX; + /* + * The RTC on some older Chromebooks can only handle alarms less than + * 24 hours in the future. The only way to find out is to try to set an + * alarm further in the future. If that fails, assume that the RTC + * connected to the EC can only handle less than 24 hours of alarm + * window. + */ + ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, SECS_PER_DAY * 2); + if (ret == -EINVAL) + cros_ec_rtc->rtc->alarm_offset_max = SECS_PER_DAY - 1; + + (void)cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, + EC_RTC_ALARM_CLEAR); + ret = devm_rtc_register_device(cros_ec_rtc->rtc); if (ret) return ret; @@ -371,7 +374,7 @@ static int cros_ec_rtc_probe(struct platform_device *pdev) return 0; } -static int cros_ec_rtc_remove(struct platform_device *pdev) +static void cros_ec_rtc_remove(struct platform_device *pdev) { struct cros_ec_rtc *cros_ec_rtc = platform_get_drvdata(pdev); struct device *dev = &pdev->dev; @@ -382,10 +385,14 @@ static int cros_ec_rtc_remove(struct platform_device *pdev) &cros_ec_rtc->notifier); if (ret) dev_err(dev, "failed to unregister notifier\n"); - - return 0; } +static const struct platform_device_id cros_ec_rtc_id[] = { + { DRV_NAME, 0 }, + {} +}; +MODULE_DEVICE_TABLE(platform, cros_ec_rtc_id); + static struct platform_driver cros_ec_rtc_driver = { .probe = cros_ec_rtc_probe, .remove = cros_ec_rtc_remove, @@ -393,6 +400,7 @@ static struct platform_driver cros_ec_rtc_driver = { .name = DRV_NAME, .pm = &cros_ec_rtc_pm_ops, }, + .id_table = cros_ec_rtc_id, }; module_platform_driver(cros_ec_rtc_driver); @@ -400,4 +408,3 @@ module_platform_driver(cros_ec_rtc_driver); MODULE_DESCRIPTION("RTC driver for Chrome OS ECs"); MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>"); MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:" DRV_NAME); |