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HID: hid-logitech-hidpp: Add range sysfs for Logitech G920

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The G920 can adjust the amount of 'turn' it permits, this patch adds
a sysfs file 'range' to control this.

Signed-off-by: Simon Wood <simon@mungewell.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Simon Wood 2015-11-19 16:42:13 -07:00 committed by Jiri Kosina
parent 7bfd2927ad
commit 7f4b49fef6
1 changed files with 139 additions and 1 deletions
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140
drivers/hid/hid-logitech-hidpp.c
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@ -1295,6 +1295,133 @@ static int k400_connect(struct hid_device *hdev, bool connected)
return k400_disable_tap_to_click(hidpp);
}
/* ------------------------------------------------------------------------- */
/* Logitech G920 Driving Force Racing Wheel for Xbox One */
/* ------------------------------------------------------------------------- */
#define HIDPP_PAGE_G920_FORCE_FEEDBACK 0x8123
/* Using session ID = 1 */
#define CMD_G920_FORCE_GET_APERTURE 0x51
#define CMD_G920_FORCE_SET_APERTURE 0x61
struct g920_private_data {
u8 force_feature;
u16 range;
};
#define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
static ssize_t g920_range_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct hid_device *hid = to_hid_device(dev);
struct hidpp_device *hidpp = hid_get_drvdata(hid);
struct g920_private_data *pdata;
pdata = hidpp->private_data;
if (!pdata) {
hid_err(hid, "Private driver data not found!\n");
return -EINVAL;
}
return scnprintf(buf, PAGE_SIZE, "%u\n", pdata->range);
}
static ssize_t g920_range_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hid = to_hid_device(dev);
struct hidpp_device *hidpp = hid_get_drvdata(hid);
struct g920_private_data *pdata;
struct hidpp_report response;
u8 params[2];
int ret;
u16 range = simple_strtoul(buf, NULL, 10);
pdata = hidpp->private_data;
if (!pdata) {
hid_err(hid, "Private driver data not found!\n");
return -EINVAL;
}
if (range < 180)
range = 180;
else if (range > 900)
range = 900;
params[0] = range >> 8;
params[1] = range & 0x00FF;
ret = hidpp_send_fap_command_sync(hidpp, pdata->force_feature,
CMD_G920_FORCE_SET_APERTURE, params, 2, &response);
if (ret)
return ret;
pdata->range = range;
return count;
}
static DEVICE_ATTR(range, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, g920_range_show, g920_range_store);
static int g920_allocate(struct hid_device *hdev)
{
struct hidpp_device *hidpp = hid_get_drvdata(hdev);
struct g920_private_data *pdata;
pdata = devm_kzalloc(&hdev->dev, sizeof(struct g920_private_data),
GFP_KERNEL);
if (!pdata)
return -ENOMEM;
hidpp->private_data = pdata;
return 0;
}
static int g920_get_config(struct hidpp_device *hidpp)
{
struct g920_private_data *pdata = hidpp->private_data;
struct hidpp_report response;
u8 feature_type;
u8 feature_index;
int ret;
pdata = hidpp->private_data;
if (!pdata) {
hid_err(hidpp->hid_dev, "Private driver data not found!\n");
return -EINVAL;
}
/* Find feature and store for later use */
ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_G920_FORCE_FEEDBACK,
&feature_index, &feature_type);
if (ret)
return ret;
pdata->force_feature = feature_index;
/* Read current Range */
ret = hidpp_send_fap_command_sync(hidpp, feature_index,
CMD_G920_FORCE_GET_APERTURE, NULL, 0, &response);
if (ret > 0) {
hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
__func__, ret);
return -EPROTO;
}
if (ret)
return ret;
pdata->range = get_unaligned_be16(&response.fap.params[0]);
/* Create sysfs interface */
ret = device_create_file(&(hidpp->hid_dev->dev), &dev_attr_range);
if (ret)
hid_warn(hidpp->hid_dev, "Unable to create sysfs interface for \"range\", errno %d\n", ret);
return 0;
}
/* -------------------------------------------------------------------------- */
/* Generic HID++ devices */
/* -------------------------------------------------------------------------- */
@ -1595,6 +1722,10 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
ret = k400_allocate(hdev);
if (ret)
goto allocate_fail;
} else if (hidpp->quirks & HIDPP_QUIRK_CLASS_G920) {
ret = g920_allocate(hdev);
if (ret)
goto allocate_fail;
}
INIT_WORK(&hidpp->work, delayed_work_cb);
@ -1648,6 +1779,10 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
ret = wtp_get_config(hidpp);
if (ret)
goto hid_hw_open_failed;
} else if (connected && (hidpp->quirks & HIDPP_QUIRK_CLASS_G920)) {
ret = g920_get_config(hidpp);
if (ret)
goto hid_hw_open_failed;
}
/* Block incoming packets */
@ -1673,6 +1808,7 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
hid_hw_open_failed:
hid_device_io_stop(hdev);
if (hidpp->quirks & HIDPP_QUIRK_CLASS_G920) {
device_remove_file(&hdev->dev, &dev_attr_range);
hid_hw_close(hdev);
hid_hw_stop(hdev);
}
@ -1689,8 +1825,10 @@ static void hidpp_remove(struct hid_device *hdev)
{
struct hidpp_device *hidpp = hid_get_drvdata(hdev);
if (hidpp->quirks & HIDPP_QUIRK_CLASS_G920)
if (hidpp->quirks & HIDPP_QUIRK_CLASS_G920) {
device_remove_file(&hdev->dev, &dev_attr_range);
hid_hw_close(hdev);
}
hid_hw_stop(hdev);
cancel_work_sync(&hidpp->work);
mutex_destroy(&hidpp->send_mutex);