diff options
| author | Vitor Soares <Vitor.Soares@synopsys.com> | 2019-07-19 16:30:54 +0300 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@collabora.com> | 2019-07-27 12:22:19 +0300 |
| commit | 934d24a5e1508e73c0001afb54a3916e4270428f (patch) | |
| tree | 6d0ea86ce4114ad395d6d4cf7d3e9c62938e9310 /drivers/i3c/device.c | |
| parent | 5f9e832c137075045d15cd6899ab0505cfb2ca4b (diff) | |
| download | linux-934d24a5e1508e73c0001afb54a3916e4270428f.tar.xz | |
i3c: move i3c_device_match_id to device.c and export it
Some I3C device drivers need to know which entry matches the
i3c_device object passed to the probe function
Let's move i3c_device_match_id() to device.c and export it so it can be
used by drivers.
Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Diffstat (limited to 'drivers/i3c/device.c')
| -rw-r--r-- | drivers/i3c/device.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c index 69cc040c3a1c..9e2e1406f85e 100644 --- a/drivers/i3c/device.c +++ b/drivers/i3c/device.c @@ -201,6 +201,59 @@ struct i3c_device *dev_to_i3cdev(struct device *dev) EXPORT_SYMBOL_GPL(dev_to_i3cdev); /** + * i3c_device_match_id() - Returns the i3c_device_id entry matching @i3cdev + * @i3cdev: I3C device + * @id_table: I3C device match table + * + * Return: a pointer to an i3c_device_id object or NULL if there's no match. + */ +const struct i3c_device_id * +i3c_device_match_id(struct i3c_device *i3cdev, + const struct i3c_device_id *id_table) +{ + struct i3c_device_info devinfo; + const struct i3c_device_id *id; + + i3c_device_get_info(i3cdev, &devinfo); + + /* + * The lower 32bits of the provisional ID is just filled with a random + * value, try to match using DCR info. + */ + if (!I3C_PID_RND_LOWER_32BITS(devinfo.pid)) { + u16 manuf = I3C_PID_MANUF_ID(devinfo.pid); + u16 part = I3C_PID_PART_ID(devinfo.pid); + u16 ext_info = I3C_PID_EXTRA_INFO(devinfo.pid); + + /* First try to match by manufacturer/part ID. */ + for (id = id_table; id->match_flags != 0; id++) { + if ((id->match_flags & I3C_MATCH_MANUF_AND_PART) != + I3C_MATCH_MANUF_AND_PART) + continue; + + if (manuf != id->manuf_id || part != id->part_id) + continue; + + if ((id->match_flags & I3C_MATCH_EXTRA_INFO) && + ext_info != id->extra_info) + continue; + + return id; + } + } + + /* Fallback to DCR match. */ + for (id = id_table; id->match_flags != 0; id++) { + if ((id->match_flags & I3C_MATCH_DCR) && + id->dcr == devinfo.dcr) + return id; + } + + return NULL; +} +EXPORT_SYMBOL_GPL(i3c_device_match_id); + +/** * i3c_driver_register_with_owner() - register an I3C device driver * * @drv: driver to register |