diff options
| author | Jim Broadus <jbroadus@gmail.com> | 2019-02-19 22:30:27 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2019-02-24 16:43:22 +0300 |
| commit | 93b6604c5a669d84e45fe5129294875bf82eb1ff (patch) | |
| tree | 07d6a5115257ca3c883421af21db513639977a00 /drivers/i2c | |
| parent | 088a8a7fb408d77b5c3029114f7ed457ed3ee715 (diff) | |
| download | linux-93b6604c5a669d84e45fe5129294875bf82eb1ff.tar.xz | |
i2c: Allow recovery of the initial IRQ by an I2C client device.
A previous change allowed I2C client devices to discover new IRQs upon
reprobe by clearing the IRQ in i2c_device_remove. However, if an IRQ was
assigned in i2c_new_device, that information is lost.
For example, the touchscreen and trackpad devices on a Dell Inspiron laptop
are I2C devices whose IRQs are defined by ACPI extended IRQ types. The
client device structures are initialized during an ACPI walk. After
removing the i2c_hid device, modprobe fails.
This change caches the initial IRQ value in i2c_new_device and then resets
the client device IRQ to the initial value in i2c_device_remove.
Fixes: 6f108dd70d30 ("i2c: Clear client->irq in i2c_device_remove")
Signed-off-by: Jim Broadus <jbroadus@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
[wsa: this is an easy to backport fix for the regression. We will
refactor the code to handle irq assignments better in general.]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-core-base.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 926ca0a7477f..cb6c5cb0df0b 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -430,7 +430,7 @@ static int i2c_device_remove(struct device *dev) dev_pm_clear_wake_irq(&client->dev); device_init_wakeup(&client->dev, false); - client->irq = 0; + client->irq = client->init_irq; return status; } @@ -741,10 +741,11 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info) client->flags = info->flags; client->addr = info->addr; - client->irq = info->irq; - if (!client->irq) - client->irq = i2c_dev_irq_from_resources(info->resources, + client->init_irq = info->irq; + if (!client->init_irq) + client->init_irq = i2c_dev_irq_from_resources(info->resources, info->num_resources); + client->irq = client->init_irq; strlcpy(client->name, info->type, sizeof(client->name)); |