HID: rmi: Add functions for writing to registers

Writing to registers is needed for setting configuration parameters.

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index 28579d783155..e2a43a1d3aa3 100644
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c
@@ -274,6 +274,46 @@ static inline int rmi_read(struct hid_device *hdev, u16 addr, void *buf)
         return rmi_read_block(hdev, addr, buf, 1);
 }
 
+static int rmi_write_block(struct hid_device *hdev, u16 addr, void *buf,
+                const int len)
+{
+        struct rmi_data *data = hid_get_drvdata(hdev);
+        int ret;
+
+        mutex_lock(&data->page_mutex);
+
+        if (RMI_PAGE(addr) != data->page) {
+                ret = rmi_set_page(hdev, RMI_PAGE(addr));
+                if (ret < 0)
+                        goto exit;
+        }
+
+        data->writeReport[0] = RMI_WRITE_REPORT_ID;
+        data->writeReport[1] = len;
+        data->writeReport[2] = addr & 0xFF;
+        data->writeReport[3] = (addr >> 8) & 0xFF;
+        memcpy(&data->writeReport[4], buf, len);
+
+        ret = rmi_write_report(hdev, data->writeReport,
+                                        data->output_report_size);
+        if (ret < 0) {
+                dev_err(&hdev->dev,
+                        "failed to write request output report (%d)\n",
+                        ret);
+                goto exit;
+        }
+        ret = 0;
+
+exit:
+        mutex_unlock(&data->page_mutex);
+        return ret;
+}
+
+static inline int rmi_write(struct hid_device *hdev, u16 addr, void *buf)
+{
+        return rmi_write_block(hdev, addr, buf, 1);
+}
+
 static void rmi_f11_process_touch(struct rmi_data *hdata, int slot,
                 u8 finger_state, u8 *touch_data)
 {