lkml.org 
[lkml]   [2018]   [Feb]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/3] HID: steam: add serial number information.
Date
This device has a feature report to send and receive commands.
Use it to get the serial number and set the device's uniq value.

Signed-off-by: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
---
drivers/hid/hid-steam.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 86 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-steam.c b/drivers/hid/hid-steam.c
index 03f912ab5484..f269a986e2be 100644
--- a/drivers/hid/hid-steam.c
+++ b/drivers/hid/hid-steam.c
@@ -34,12 +34,17 @@ struct steam_device {
unsigned long quirks;
struct work_struct work_connect;
bool connected;
+ char serial_no[11];
};

static int steam_register(struct steam_device *steam);
static void steam_unregister(struct steam_device *steam);
static void steam_do_connect_event(struct steam_device *steam, bool connected);
static void steam_do_input_event(struct steam_device *steam, u8 *data);
+static int steam_send_report(struct steam_device *steam,
+ u8 *cmd, int size);
+static int steam_recv_report(struct steam_device *steam,
+ u8 *data, int size);

static int steam_input_open(struct input_dev *dev)
{
@@ -55,6 +60,78 @@ static void steam_input_close(struct input_dev *dev)
hid_hw_close(steam->hid_dev);
}

+#define STEAM_FEATURE_REPORT_SIZE 65
+
+static int steam_send_report(struct steam_device *steam,
+ u8 *cmd, int size)
+{
+ int retry;
+ int ret;
+ u8 *buf = kzalloc(STEAM_FEATURE_REPORT_SIZE, GFP_KERNEL);
+
+ if (!buf)
+ return -ENOMEM;
+
+ /* The report ID is always 0 */
+ memcpy(buf + 1, cmd, size);
+
+ /* Sometimes the wireless controller fails with EPIPE
+ * when sending a feature report.
+ * Doing a HID_REQ_GET_REPORT and waiting for a while
+ * seems to fix that.
+ */
+ for (retry = 0; retry < 10; ++retry) {
+ ret = hid_hw_raw_request(steam->hid_dev, 0,
+ buf, size + 1,
+ HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+ if (ret != -EPIPE)
+ break;
+ dbg_hid("%s: failed, retrying (%d times)\n", __func__, retry+1);
+ steam_recv_report(steam, NULL, 0);
+ msleep(50);
+ }
+ kfree(buf);
+ return ret;
+}
+
+static int steam_recv_report(struct steam_device *steam,
+ u8 *data, int size)
+{
+ int ret;
+ u8 *buf = kzalloc(STEAM_FEATURE_REPORT_SIZE, GFP_KERNEL);
+
+ if (!buf)
+ return -ENOMEM;
+
+ /* The report ID is always 0 */
+ ret = hid_hw_raw_request(steam->hid_dev, 0x00,
+ buf, STEAM_FEATURE_REPORT_SIZE,
+ HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
+ memcpy(data, buf + 1, size);
+ kfree(buf);
+ return ret;
+}
+
+static int steam_get_serial(struct steam_device *steam)
+{
+ /* Send: 0xae 0x15 0x01
+ * Recv: 0xae 0x15 0x01 serialnumber (10 chars)
+ */
+ int ret;
+ u8 cmd[] = {0xae, 0x15, 0x01};
+ u8 reply[14];
+
+ ret = steam_send_report(steam, cmd, sizeof(cmd));
+ if (ret < 0)
+ return ret;
+ ret = steam_recv_report(steam, reply, sizeof(reply));
+ if (ret < 0)
+ return ret;
+ reply[13] = 0;
+ strcpy(steam->serial_no, reply + 3);
+ return 0;
+}
+
static void steam_work_connect_cb(struct work_struct *work)
{
struct steam_device *steam = container_of(work, struct steam_device,
@@ -385,7 +462,12 @@ static int steam_register(struct steam_device *steam)

dbg_hid("%s\n", __func__);

- hid_info(hdev, "Steam Controller connected");
+ ret = steam_get_serial(steam);
+ if (ret)
+ return ret;
+
+ hid_info(hdev, "Steam Controller SN: '%s' connected",
+ steam->serial_no);

input = input_allocate_device();
if (!input)
@@ -398,7 +480,7 @@ static int steam_register(struct steam_device *steam)

input->name = "Steam Controller";
input->phys = hdev->phys;
- input->uniq = hdev->uniq;
+ input->uniq = steam->serial_no;
input->id.bustype = hdev->bus;
input->id.vendor = hdev->vendor;
input->id.product = hdev->product;
@@ -447,7 +529,8 @@ static void steam_unregister(struct steam_device *steam)
dbg_hid("%s\n", __func__);

if (steam->input_dev) {
- hid_info(steam->hid_dev, "Steam Controller disconnected");
+ hid_info(steam->hid_dev, "Steam Controller SN: '%s' disconnected",
+ steam->serial_no);
input_unregister_device(steam->input_dev);
steam->input_dev = NULL;
}
--
2.16.1
\
 
 \ /
  Last update: 2018-02-13 13:05    [W:0.121 / U:7.196 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site