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>

diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index 28579d7831557af8bf1b650bbf9e6abcbea1e8e1..e2a43a1d3aa3ab1fefc8559422c5dfb164ed5ef4 100644 (file)
--- 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)
 {