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i2c: core: Allow empty id_table in ACPI case as well 

For now empty ID table is not allowed with ACPI and prevents driver to
be probed.

Add a check to allow empty ID table.

This introduces a helper i2c_acpi_match_device().

Note, we rename some static function in i2c-core-acpi.c to distinguish
with public API.

Fixes: da10c06a04 ("i2c: Make I2C ID tables non-mandatory for DT'ed devices")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Rajmohan Mani <rajmohan.mani@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[wsa: needed to get some drivers probed again]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
zero-colors
Andy Shevchenko 2017-07-17 17:13:28 +03:00 committed by Wolfram Sang
parent 16f73eb02d
commit c64ffff7a9
3 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/i2c/i2c-core-acpi.c
View File

@ -230,6 +230,16 @@ void i2c_acpi_register_devices(struct i2c_adapter *adap)
dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
}
const struct acpi_device_id *
i2c_acpi_match_device(const struct acpi_device_id *matches,
struct i2c_client *client)
{
if (!(client && matches))
return NULL;
return acpi_match_device(matches, &client->dev);
}
static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
void *data, void **return_value)
{
@ -289,7 +299,7 @@ u32 i2c_acpi_find_bus_speed(struct device *dev)
}
EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
static int i2c_acpi_match_adapter(struct device *dev, void *data)
static int i2c_acpi_find_match_adapter(struct device *dev, void *data)
{
struct i2c_adapter *adapter = i2c_verify_adapter(dev);
@ -299,7 +309,7 @@ static int i2c_acpi_match_adapter(struct device *dev, void *data)
return ACPI_HANDLE(dev) == (acpi_handle)data;
}
static int i2c_acpi_match_device(struct device *dev, void *data)
static int i2c_acpi_find_match_device(struct device *dev, void *data)
{
return ACPI_COMPANION(dev) == data;
}
@ -309,7 +319,7 @@ static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
struct device *dev;
dev = bus_find_device(&i2c_bus_type, NULL, handle,
i2c_acpi_match_adapter);
i2c_acpi_find_match_adapter);
return dev ? i2c_verify_adapter(dev) : NULL;
}
@ -317,7 +327,8 @@ static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
{
struct device *dev;
dev = bus_find_device(&i2c_bus_type, NULL, adev, i2c_acpi_match_device);
dev = bus_find_device(&i2c_bus_type, NULL, adev,
i2c_acpi_find_match_device);
return dev ? i2c_verify_client(dev) : NULL;
}

1
drivers/i2c/i2c-core-base.c
View File

@ -357,6 +357,7 @@ static int i2c_device_probe(struct device *dev)
* Tree match table entry is supplied for the probing device.
*/
if (!driver->id_table &&
!i2c_acpi_match_device(dev->driver->acpi_match_table, client) &&
!i2c_of_match_device(dev->driver->of_match_table, client))
return -ENODEV;

9
drivers/i2c/i2c-core.h
View File

@ -31,9 +31,18 @@ int i2c_check_addr_validity(unsigned addr, unsigned short flags);
int i2c_check_7bit_addr_validity_strict(unsigned short addr);
#ifdef CONFIG_ACPI
const struct acpi_device_id *
i2c_acpi_match_device(const struct acpi_device_id *matches,
struct i2c_client *client);
void i2c_acpi_register_devices(struct i2c_adapter *adap);
#else /* CONFIG_ACPI */
static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
static inline const struct acpi_device_id *
i2c_acpi_match_device(const struct acpi_device_id *matches,
struct i2c_client *client)
{
return NULL;
}
#endif /* CONFIG_ACPI */
extern struct notifier_block i2c_acpi_notifier;