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206 lines
8.6 KiB
Diff
206 lines
8.6 KiB
Diff
From patchwork Sun Feb 7 21:49:02 2021
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Sun, 07 Feb 2021 13:49:21 -0800 (PST)
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From: Roderick Colenbrander <roderick@gaikai.com>
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To: Jiri Kosina <jikos@kernel.org>,
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Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Cc: linux-input@vger.kernel.org, Chris Ye <lzye@google.com>, =?utf-8?q?Barna?=
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=?utf-8?q?l?= <linux@florianmaerkl.de>,
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Roderick Colenbrander <roderick.colenbrander@sony.com>
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Subject: [PATCH v6 07/13] HID: playstation: add DualSense Bluetooth support.
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Date: Sun, 7 Feb 2021 13:49:02 -0800
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Message-Id: <20210207214908.79573-8-roderick@gaikai.com>
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From: Roderick Colenbrander <roderick.colenbrander@sony.com>
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This patch adds support for the DualSense when operating in Bluetooth mode.
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The device has the same behavior as the DualShock 4 in that by default it
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sends a limited input report (0x1), but after requesting calibration data,
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it switches to an extended input report (report 49), which adds data for
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touchpad, motion sensors, battery and more.
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Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
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---
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drivers/hid/Kconfig | 1 +
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drivers/hid/hid-playstation.c | 41 +++++++++++++++++++++++++++++++++++
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2 files changed, 42 insertions(+)
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diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
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index 0c141f2312f7..b3ec01c7a0b7 100644
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--- a/drivers/hid/Kconfig
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+++ b/drivers/hid/Kconfig
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@@ -856,6 +856,7 @@ config HID_PLANTRONICS
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config HID_PLAYSTATION
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tristate "PlayStation HID Driver"
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depends on HID
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+ select CRC32
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select POWER_SUPPLY
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help
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Provides support for Sony PS5 controllers including support for
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diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c
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index 20fe29fc61c0..a4ef9fae7a36 100644
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--- a/drivers/hid/hid-playstation.c
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+++ b/drivers/hid/hid-playstation.c
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@@ -6,6 +6,7 @@
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*/
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#include <linux/bits.h>
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+#include <linux/crc32.h>
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/input/mt.h>
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@@ -45,8 +46,14 @@ struct ps_calibration_data {
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int sens_denom;
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};
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+/* Seed values for DualShock4 / DualSense CRC32 for different report types. */
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+#define PS_INPUT_CRC32_SEED 0xA1
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+#define PS_FEATURE_CRC32_SEED 0xA3
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+
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#define DS_INPUT_REPORT_USB 0x01
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#define DS_INPUT_REPORT_USB_SIZE 64
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+#define DS_INPUT_REPORT_BT 0x31
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+#define DS_INPUT_REPORT_BT_SIZE 78
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#define DS_FEATURE_REPORT_CALIBRATION 0x05
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#define DS_FEATURE_REPORT_CALIBRATION_SIZE 41
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@@ -300,6 +307,17 @@ static int ps_device_register_battery(struct ps_device *dev)
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return 0;
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}
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+/* Compute crc32 of HID data and compare against expected CRC. */
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+static bool ps_check_crc32(uint8_t seed, uint8_t *data, size_t len, uint32_t report_crc)
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+{
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+ uint32_t crc;
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+
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+ crc = crc32_le(0xFFFFFFFF, &seed, 1);
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+ crc = ~crc32_le(crc, data, len);
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+
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+ return crc == report_crc;
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+}
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+
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static struct input_dev *ps_gamepad_create(struct hid_device *hdev)
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{
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struct input_dev *gamepad;
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@@ -351,6 +369,17 @@ static int ps_get_report(struct hid_device *hdev, uint8_t report_id, uint8_t *bu
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return -EINVAL;
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}
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+ if (hdev->bus == BUS_BLUETOOTH) {
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+ /* Last 4 bytes contains crc32. */
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+ uint8_t crc_offset = size - 4;
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+ uint32_t report_crc = get_unaligned_le32(&buf[crc_offset]);
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+
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+ if (!ps_check_crc32(PS_FEATURE_CRC32_SEED, buf, crc_offset, report_crc)) {
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+ hid_err(hdev, "CRC check failed for reportID=%d\n", report_id);
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+ return -EILSEQ;
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+ }
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+ }
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+
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return 0;
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}
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@@ -552,6 +581,17 @@ static int dualsense_parse_report(struct ps_device *ps_dev, struct hid_report *r
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if (hdev->bus == BUS_USB && report->id == DS_INPUT_REPORT_USB &&
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size == DS_INPUT_REPORT_USB_SIZE) {
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ds_report = (struct dualsense_input_report *)&data[1];
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+ } else if (hdev->bus == BUS_BLUETOOTH && report->id == DS_INPUT_REPORT_BT &&
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+ size == DS_INPUT_REPORT_BT_SIZE) {
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+ /* Last 4 bytes of input report contain crc32 */
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+ uint32_t report_crc = get_unaligned_le32(&data[size - 4]);
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+
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+ if (!ps_check_crc32(PS_INPUT_CRC32_SEED, data, size - 4, report_crc)) {
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+ hid_err(hdev, "DualSense input CRC's check failed\n");
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+ return -EILSEQ;
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+ }
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+
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+ ds_report = (struct dualsense_input_report *)&data[2];
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} else {
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hid_err(hdev, "Unhandled reportID=%d\n", report->id);
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return -1;
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@@ -815,6 +855,7 @@ static void ps_remove(struct hid_device *hdev)
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}
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static const struct hid_device_id ps_devices[] = {
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+ { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS5_CONTROLLER) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS5_CONTROLLER) },
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{ }
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};
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