Adds a new sysfs node under the cros_ec device which contains the uptime of the EC in milliseconds since boot.
Signed-off-by: Tim Wawrzynczak <[email protected]> --- drivers/platform/chrome/cros_ec_sysfs.c | 34 +++++++++++++++++++++++++ include/linux/mfd/cros_ec_commands.h | 15 +++++++++++ 2 files changed, 49 insertions(+) diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c index 5a6db3fe213a..7e5ca1e2900b 100644 --- a/drivers/platform/chrome/cros_ec_sysfs.c +++ b/drivers/platform/chrome/cros_ec_sysfs.c @@ -123,6 +123,38 @@ static ssize_t reboot_store(struct device *dev, return count; } +static ssize_t uptime_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ec_response_uptime_info *resp; + struct cros_ec_command *msg; + int ret; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + u32 time_since_ec_boot_ms; + + msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL); + if (!msg) + return -ENOMEM; + + /* Get EC uptime information */ + msg->version = 0; + msg->command = EC_CMD_GET_UPTIME_INFO + ec->cmd_offset; + msg->insize = sizeof(*resp); + msg->outsize = 0; + ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); + if (ret < 0) { + time_since_ec_boot_ms = 0; + } else { + resp = (struct ec_response_uptime_info *)msg->data; + time_since_ec_boot_ms = resp->time_since_ec_boot_ms; + } + + ret = scnprintf(buf, PAGE_SIZE, "%u\n", time_since_ec_boot_ms); + + kfree(msg); + return ret; +} + static ssize_t version_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -330,12 +362,14 @@ static DEVICE_ATTR_RW(reboot); static DEVICE_ATTR_RO(version); static DEVICE_ATTR_RO(flashinfo); static DEVICE_ATTR_RW(kb_wake_angle); +static DEVICE_ATTR_RO(uptime); static struct attribute *__ec_attrs[] = { &dev_attr_kb_wake_angle.attr, &dev_attr_reboot.attr, &dev_attr_version.attr, &dev_attr_flashinfo.attr, + &dev_attr_uptime.attr, NULL, }; diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h index a8c882b5c222..38e7e6dcca97 100644 --- a/include/linux/mfd/cros_ec_commands.h +++ b/include/linux/mfd/cros_ec_commands.h @@ -4697,6 +4697,21 @@ struct __ec_align4 ec_params_rwsig_action { uint32_t action; }; +/* For getting EC uptime & AP reset information */ +#define EC_CMD_GET_UPTIME_INFO 0x0121 + +struct __ec_align4 ec_response_uptime_info { + uint32_t time_since_ec_boot_ms; /* uptime in ms */ + uint32_t ap_resets_since_ec_boot; /* AP resets recorded by EC */ + uint32_t ec_reset_flags; /* RESET_* flags */ + /* Empty log entries have cause and timestamp set to zero */ + struct ap_reset_log_entry { + uint16_t reset_cause; /* enum chipset_*_reason */ + uint16_t reserved; /* reserved for protocol growth */ + uint32_t reset_time_ms; /* time of reset assertion */ + } recent_ap_reset[4]; +}; + /*****************************************************************************/ /* The command range 0x200-0x2FF is reserved for Rotor. */ -- 2.20.1
