| Message ID | 20210102223109.996781-3-roderick@gaikai.com |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
Hi 2021. január 2., szombat 23:30 keltezéssel, Roderick Colenbrander írta: > From: Roderick Colenbrander roderick.colenbrander@sony.com > > Use the DualSense MAC address as a unique identifier for the HID device. > > Signed-off-by: Roderick Colenbrander roderick.colenbrander@sony.com > > [...] > /* Button masks for DualSense input report. */ > #define DS_BUTTONS0_HAT_SWITCH GENMASK(3, 0) > #define DS_BUTTONS0_SQUARE BIT(4) > @@ -132,6 +136,7 @@ static struct input_dev *ps_allocate_input_dev(struct hid_device *hdev, const ch > return input_dev; > } > > + I think this extra empty line is not necessary here. > static struct input_dev *ps_gamepad_create(struct hid_device *hdev) > { > struct input_dev *gamepad; > @@ -162,6 +167,34 @@ static struct input_dev *ps_gamepad_create(struct hid_device *hdev) > return gamepad; > } > > +static int dualsense_get_mac_address(struct dualsense *ds) > +{ > + uint8_t *buf; > + int ret = 0; > + > + buf = kzalloc(DS_FEATURE_REPORT_PAIRING_INFO_SIZE, GFP_KERNEL); > + if (!buf) > + return -ENOMEM; > + > + ret = hid_hw_raw_request(ds->base.hdev, DS_FEATURE_REPORT_PAIRING_INFO, buf, > + DS_FEATURE_REPORT_PAIRING_INFO_SIZE, HID_FEATURE_REPORT, > + HID_REQ_GET_REPORT); > + if (ret < 0) > + goto err_free; > + else if (ret != DS_FEATURE_REPORT_PAIRING_INFO_SIZE) { As per coding style[1], please either use {} for all branches, or just drop the `else` and maybe add a new line: ``` if (ret < 0) goto ... if (ret != ...) { ... } ``` > + hid_err(ds->base.hdev, "failed to retrieve DualSense pairing info\n"); I think this message could be improved to better pinpoint the actual problem that triggers it. > + ret = -EINVAL; > + goto err_free; > + } > + > + /* Note MAC address is stored in little endian order. */ Maybe this comment would be better placed in `struct ps_device`? > + memcpy(ds->base.mac_address, &buf[1], sizeof(ds->base.mac_address)); > + > +err_free: > + kfree(buf); > + return ret; > +} > [...] [1]: https://www.kernel.org/doc/html/latest/process/coding-style.html#placing-braces-and-spaces Regards, Barnabás Pőcze
diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c index 3d5fe9069c26..af4a635997bb 100644 --- a/drivers/hid/hid-playstation.c +++ b/drivers/hid/hid-playstation.c @@ -21,12 +21,16 @@ /* Base class for playstation devices. */ struct ps_device { struct hid_device *hdev; + uint8_t mac_address[6]; int (*parse_report)(struct ps_device *dev, struct hid_report *report, u8 *data, int size); }; #define DS_INPUT_REPORT_USB 0x01 +#define DS_FEATURE_REPORT_PAIRING_INFO 9 +#define DS_FEATURE_REPORT_PAIRING_INFO_SIZE 19 + /* Button masks for DualSense input report. */ #define DS_BUTTONS0_HAT_SWITCH GENMASK(3, 0) #define DS_BUTTONS0_SQUARE BIT(4) @@ -132,6 +136,7 @@ static struct input_dev *ps_allocate_input_dev(struct hid_device *hdev, const ch return input_dev; } + static struct input_dev *ps_gamepad_create(struct hid_device *hdev) { struct input_dev *gamepad; @@ -162,6 +167,34 @@ static struct input_dev *ps_gamepad_create(struct hid_device *hdev) return gamepad; } +static int dualsense_get_mac_address(struct dualsense *ds) +{ + uint8_t *buf; + int ret = 0; + + buf = kzalloc(DS_FEATURE_REPORT_PAIRING_INFO_SIZE, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = hid_hw_raw_request(ds->base.hdev, DS_FEATURE_REPORT_PAIRING_INFO, buf, + DS_FEATURE_REPORT_PAIRING_INFO_SIZE, HID_FEATURE_REPORT, + HID_REQ_GET_REPORT); + if (ret < 0) + goto err_free; + else if (ret != DS_FEATURE_REPORT_PAIRING_INFO_SIZE) { + hid_err(ds->base.hdev, "failed to retrieve DualSense pairing info\n"); + ret = -EINVAL; + goto err_free; + } + + /* Note MAC address is stored in little endian order. */ + memcpy(ds->base.mac_address, &buf[1], sizeof(ds->base.mac_address)); + +err_free: + kfree(buf); + return ret; +} + static int dualsense_parse_report(struct ps_device *ps_dev, struct hid_report *report, u8 *data, int size) { @@ -230,6 +263,13 @@ static struct ps_device *dualsense_create(struct hid_device *hdev) ds->base.parse_report = dualsense_parse_report; hid_set_drvdata(hdev, ds); + ret = dualsense_get_mac_address(ds); + if (ret < 0) { + hid_err(hdev, "Failed to get MAC address from DualSense\n"); + return ERR_PTR(ret); + } + snprintf(hdev->uniq, sizeof(hdev->uniq), "%pMR", ds->base.mac_address); + ds->gamepad = ps_gamepad_create(hdev); if (IS_ERR(ds->gamepad)) { ret = PTR_ERR(ds->gamepad);