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| author |   Tim Wawrzynczak <twawrzynczak@chromium.org> | 2019-06-13 11:57:36 -0600 |
|---|---|---|
| committer |   Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2019-06-18 10:07:13 +0200 |
| commit | e90716a6612150218aaff1fd47ca6de954100a06 (patch) | |
| tree | ccfae2f4789fdf355865630fbb3db2c248c15061 /drivers/platform | |
| parent | Merge tag 'ib-mfd-cros-v5.3' into chrome-platform/for-next (diff) | |
| download | linux-dev-e90716a6612150218aaff1fd47ca6de954100a06.tar.xz linux-dev-e90716a6612150218aaff1fd47ca6de954100a06.zip | |
platform/chrome: cros_ec_debugfs: Add debugfs entry to retrieve EC uptime
The new debugfs entry 'uptime' is being made available to userspace so that
a userspace daemon can synchronize EC logs with host time.
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
[rework based on Tim's first approach]
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Tested-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/chrome/cros_ec_debugfs.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c index 4578eb3e0731..970ba13df9a1 100644 --- a/drivers/platform/chrome/cros_ec_debugfs.c +++ b/drivers/platform/chrome/cros_ec_debugfs.c @@ -241,6 +241,34 @@ static ssize_t cros_ec_pdinfo_read(struct file *file, read_buf, p - read_buf); } +static ssize_t cros_ec_uptime_read(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct cros_ec_debugfs *debug_info = file->private_data; + struct cros_ec_device *ec_dev = debug_info->ec->ec_dev; + struct { + struct cros_ec_command cmd; + struct ec_response_uptime_info resp; + } __packed msg = {}; + struct ec_response_uptime_info *resp; + char read_buf[32]; + int ret; + + resp = (struct ec_response_uptime_info *)&msg.resp; + + msg.cmd.command = EC_CMD_GET_UPTIME_INFO; + msg.cmd.insize = sizeof(*resp); + + ret = cros_ec_cmd_xfer_status(ec_dev, &msg.cmd); + if (ret < 0) + return ret; + + ret = scnprintf(read_buf, sizeof(read_buf), "%u\n", + resp->time_since_ec_boot_ms); + + return simple_read_from_buffer(user_buf, count, ppos, read_buf, ret); +} + static const struct file_operations cros_ec_console_log_fops = { .owner = THIS_MODULE, .open = cros_ec_console_log_open, @@ -257,6 +285,13 @@ static const struct file_operations cros_ec_pdinfo_fops = { .llseek = default_llseek, }; +const struct file_operations cros_ec_uptime_fops = { + .owner = THIS_MODULE, + .open = simple_open, + .read = cros_ec_uptime_read, + .llseek = default_llseek, +}; + static int ec_read_version_supported(struct cros_ec_dev *ec) { struct ec_params_get_cmd_versions_v1 *params; @@ -408,6 +443,9 @@ static int cros_ec_debugfs_probe(struct platform_device *pd) debugfs_create_file("pdinfo", 0444, debug_info->dir, debug_info, &cros_ec_pdinfo_fops); + debugfs_create_file("uptime", 0444, debug_info->dir, debug_info, + &cros_ec_uptime_fops); + ec->debug_info = debug_info; dev_set_drvdata(&pd->dev, ec); |