Currently the I2C framework insists on devices supplying an I2C ID
table. Many of the devices which do so unnecessarily adding quite a
few wasted lines to kernel code. This patch allows drivers a means
to 'not' supply the aforementioned table and match on either DT
and/or ACPI match tables instead.
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
drivers/i2c/i2c-core.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 7c7f4b8..703da9e 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -260,13 +260,25 @@ static int i2c_device_probe(struct device *dev)
{
struct i2c_client *client = i2c_verify_client(dev);
struct i2c_driver *driver;
+ const struct of_device_id *of_match = dev->driver->of_match_table;
+ const struct acpi_device_id *acpi_match = dev->driver->acpi_match_table;
int status;
if (!client)
return 0;
driver = to_i2c_driver(dev->driver);
- if (!driver->probe || !driver->id_table)
+ if (!driver->probe)
+ return -EINVAL;
+
+ /*
+ * An I2C ID table is not madatory, if and only if, a suitable Device
+ * Tree and/or ACPI match table entry is supplied for the probing
+ * device.
+ */
+ if (!driver->id_table &&
+ !of_match_device(of_match, dev) &&
+ !acpi_match_device(acpi_match, dev))
return -ENODEV;
if (!device_can_wakeup(&client->dev))
@@ -275,7 +287,12 @@ static int i2c_device_probe(struct device *dev)
dev_dbg(dev, "probe\n");
acpi_dev_pm_attach(&client->dev, true);
- status = driver->probe(client, i2c_match_id(driver->id_table, client));
+
+ if (!driver->id_table)
+ status = driver->probe(client, NULL);
+ else
+ status = driver->probe(client,
+ i2c_match_id(driver->id_table, client));
if (status)
acpi_dev_pm_detach(&client->dev, true);
--
1.8.3.2
--
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