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Subject[PATCH v1 07/11] ti948: Add sysfs node for alive attribute
Date
This may be used by userspace to determine the state
of the device.

Signed-off-by: Michael Drake <michael.drake@codethink.co.uk>
Cc: Patrick Glaser <pglaser@tesla.com>
Cc: Nate Case <ncase@tesla.com>
---
drivers/gpu/drm/bridge/ti948.c | 28 ++++++++++++++++++++++++++--
1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti948.c b/drivers/gpu/drm/bridge/ti948.c
index b5c766711c4b..b624eaeabb43 100644
--- a/drivers/gpu/drm/bridge/ti948.c
+++ b/drivers/gpu/drm/bridge/ti948.c
@@ -412,6 +412,16 @@ static void ti948_alive_check(struct work_struct *work)
schedule_delayed_work(&ti948->alive_check, TI948_ALIVE_CHECK_DELAY);
}

+static ssize_t alive_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ti948_ctx *ti948 = ti948_ctx_from_dev(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%u\n", (unsigned int)ti948->alive);
+}
+
+static DEVICE_ATTR_RO(alive);
+
static int ti948_pm_resume(struct device *dev)
{
struct ti948_ctx *ti948 = ti948_ctx_from_dev(dev);
@@ -614,17 +624,31 @@ static int ti948_probe(struct i2c_client *client,

i2c_set_clientdata(client, ti948);

+ ret = device_create_file(&client->dev, &dev_attr_alive);
+ if (ret) {
+ dev_err(&client->dev, "Could not create alive attr\n");
+ return ret;
+ }
+
ret = ti948_pm_resume(&client->dev);
- if (ret != 0)
- return -EPROBE_DEFER;
+ if (ret != 0) {
+ ret = -EPROBE_DEFER;
+ goto error;
+ }

dev_info(&ti948->i2c->dev, "End probe (addr: %x)\n", ti948->i2c->addr);

return 0;
+
+error:
+ device_remove_file(&client->dev, &dev_attr_alive);
+ return ret;
}

static int ti948_remove(struct i2c_client *client)
{
+ device_remove_file(&client->dev, &dev_attr_alive);
+
return ti948_pm_suspend(&client->dev);
}

--
2.20.1
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