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authorBrian Norris <briannorris@chromium.org>2017-02-10 05:03:57 +0300
committerJiri Kosina <jkosina@suse.cz>2017-03-06 15:48:44 +0300
commit572d3c6444979a6a49c6b464110563f578e8dece (patch)
treeedfa44f72e6d60a0b4ca84705e39f6a3b8dd9812 /drivers/hid/i2c-hid
parentcb5cfd91a7ae5ae355e657e5ce4931836b7665eb (diff)
downloadlinux-572d3c6444979a6a49c6b464110563f578e8dece.tar.xz
HID: i2c-hid: support regulator power on/off
On some boards, we need to enable a regulator before using the HID, and it's also nice to save power in suspend by disabling it. Support an optional "vdd-supply" and a companion initialization delay. Signed-off-by: Brian Norris <briannorris@chromium.org> Signed-off-by: Caesar Wang <wxt@rock-chips.com> Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Jiri Kosina <jikos@kernel.org> Cc: linux-input@vger.kernel.org Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/i2c-hid')
-rw-r--r--drivers/hid/i2c-hid/i2c-hid.c42
1 files changed, 40 insertions, 2 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index ea3c3546cef7..a3f6daf0886b 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -994,6 +994,11 @@ static int i2c_hid_of_probe(struct i2c_client *client,
}
pdata->hid_descriptor_address = val;
+ ret = of_property_read_u32(dev->of_node, "post-power-on-delay-ms",
+ &val);
+ if (!ret)
+ pdata->post_power_delay_ms = val;
+
return 0;
}
@@ -1053,6 +1058,24 @@ static int i2c_hid_probe(struct i2c_client *client,
ihid->pdata = *platform_data;
}
+ ihid->pdata.supply = devm_regulator_get(&client->dev, "vdd");
+ if (IS_ERR(ihid->pdata.supply)) {
+ ret = PTR_ERR(ihid->pdata.supply);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&client->dev, "Failed to get regulator: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = regulator_enable(ihid->pdata.supply);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to enable regulator: %d\n",
+ ret);
+ goto err;
+ }
+ if (ihid->pdata.post_power_delay_ms)
+ msleep(ihid->pdata.post_power_delay_ms);
+
i2c_set_clientdata(client, ihid);
ihid->client = client;
@@ -1068,7 +1091,7 @@ static int i2c_hid_probe(struct i2c_client *client,
* real computation later. */
ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
if (ret < 0)
- goto err;
+ goto err_regulator;
pm_runtime_get_noresume(&client->dev);
pm_runtime_set_active(&client->dev);
@@ -1125,6 +1148,9 @@ err_pm:
pm_runtime_put_noidle(&client->dev);
pm_runtime_disable(&client->dev);
+err_regulator:
+ regulator_disable(ihid->pdata.supply);
+
err:
i2c_hid_free_buffers(ihid);
kfree(ihid);
@@ -1149,6 +1175,8 @@ static int i2c_hid_remove(struct i2c_client *client)
if (ihid->bufsize)
i2c_hid_free_buffers(ihid);
+ regulator_disable(ihid->pdata.supply);
+
kfree(ihid);
return 0;
@@ -1199,6 +1227,10 @@ static int i2c_hid_suspend(struct device *dev)
else
hid_warn(hid, "Failed to enable irq wake: %d\n",
wake_status);
+ } else {
+ ret = regulator_disable(ihid->pdata.supply);
+ if (ret < 0)
+ hid_warn(hid, "Failed to disable supply: %d\n", ret);
}
return 0;
@@ -1212,7 +1244,13 @@ static int i2c_hid_resume(struct device *dev)
struct hid_device *hid = ihid->hid;
int wake_status;
- if (device_may_wakeup(&client->dev) && ihid->irq_wake_enabled) {
+ if (!device_may_wakeup(&client->dev)) {
+ ret = regulator_enable(ihid->pdata.supply);
+ if (ret < 0)
+ hid_warn(hid, "Failed to enable supply: %d\n", ret);
+ if (ihid->pdata.post_power_delay_ms)
+ msleep(ihid->pdata.post_power_delay_ms);
+ } else if (ihid->irq_wake_enabled) {
wake_status = disable_irq_wake(client->irq);
if (!wake_status)
ihid->irq_wake_enabled = false;