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HID: wiimote: Add write-register helpers

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Add helpers to synchronously write registers of the wiimote. This is heavily
used by initialization functions for wiimote peripherals.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
David Herrmann 2011-09-06 13:50:35 +02:00 committed by Jiri Kosina
parent 29d28064e2
commit 33e84013d7
1 changed files with 27 additions and 1 deletions
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28
drivers/hid/hid-wiimote.c
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@ -39,6 +39,9 @@ struct wiimote_state {
struct completion ready;
int cmd;
__u32 opt;
/* results of synchronous requests */
__u8 cmd_err;
};
struct wiimote_data {
@ -394,6 +397,25 @@ static void wiiproto_req_wmem(struct wiimote_data *wdata, bool eeprom,
wiimote_queue(wdata, cmd, sizeof(cmd));
}
/* requries the cmd-mutex to be held */
static int wiimote_cmd_write(struct wiimote_data *wdata, __u32 offset,
const __u8 *wmem, __u8 size)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&wdata->state.lock, flags);
wiimote_cmd_set(wdata, WIIPROTO_REQ_WMEM, 0);
wiiproto_req_wreg(wdata, offset, wmem, size);
spin_unlock_irqrestore(&wdata->state.lock, flags);
ret = wiimote_cmd_wait(wdata);
if (!ret && wdata->state.cmd_err)
ret = -EIO;
return ret;
}
static enum led_brightness wiimote_leds_get(struct led_classdev *led_dev)
{
struct wiimote_data *wdata;
@ -635,9 +657,13 @@ static void handler_return(struct wiimote_data *wdata, const __u8 *payload)
handler_keys(wdata, payload);
if (err)
if (wiimote_cmd_pending(wdata, cmd, 0)) {
wdata->state.cmd_err = err;
wiimote_cmd_complete(wdata);
} else if (err) {
hid_warn(wdata->hdev, "Remote error %hhu on req %hhu\n", err,
cmd);
}
}
static void handler_drm_KA(struct wiimote_data *wdata, const __u8 *payload)