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HID: wiimote: Add read-mem helpers 

Add helper functions similar to the write-mem helpers but for reading wiimote
memory and eeprom.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
David Herrmann 2011-11-17 14:12:00 +01:00 committed by Jiri Kosina
parent 7e27440062
commit fad8c0e343
2 changed files with 81 additions and 0 deletions
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77
drivers/hid/hid-wiimote-core.c
View File

@ -312,6 +312,37 @@ static void wiiproto_req_wmem(struct wiimote_data *wdata, bool eeprom,
wiimote_queue(wdata, cmd, sizeof(cmd));
}
#define wiiproto_req_rreg(wdata, os, sz) \
wiiproto_req_rmem((wdata), false, (os), (sz))
#define wiiproto_req_reeprom(wdata, os, sz) \
wiiproto_req_rmem((wdata), true, (os), (sz))
static void wiiproto_req_rmem(struct wiimote_data *wdata, bool eeprom,
__u32 offset, __u16 size)
{
__u8 cmd[7];
if (size == 0) {
hid_warn(wdata->hdev, "Invalid length %d rmem request\n", size);
return;
}
cmd[0] = WIIPROTO_REQ_RMEM;
cmd[1] = 0;
cmd[2] = (offset >> 16) & 0xff;
cmd[3] = (offset >> 8) & 0xff;
cmd[4] = offset & 0xff;
cmd[5] = (size >> 8) & 0xff;
cmd[6] = size & 0xff;
if (!eeprom)
cmd[1] |= 0x04;
wiiproto_keep_rumble(wdata, &cmd[1]);
wiimote_queue(wdata, cmd, sizeof(cmd));
}
/* requries the cmd-mutex to be held */
int wiimote_cmd_write(struct wiimote_data *wdata, __u32 offset,
const __u8 *wmem, __u8 size)
@ -331,6 +362,36 @@ int wiimote_cmd_write(struct wiimote_data *wdata, __u32 offset,
return ret;
}
/* requries the cmd-mutex to be held */
ssize_t wiimote_cmd_read(struct wiimote_data *wdata, __u32 offset, __u8 *rmem,
__u8 size)
{
unsigned long flags;
ssize_t ret;
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->state.cmd_read_size = size;
wdata->state.cmd_read_buf = rmem;
wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, offset & 0xffff);
wiiproto_req_rreg(wdata, offset, size);
spin_unlock_irqrestore(&wdata->state.lock, flags);
ret = wiimote_cmd_wait(wdata);
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->state.cmd_read_buf = NULL;
spin_unlock_irqrestore(&wdata->state.lock, flags);
if (!ret) {
if (wdata->state.cmd_read_size == 0)
ret = -EIO;
else
ret = wdata->state.cmd_read_size;
}
return ret;
}
static int wiimote_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
@ -742,7 +803,23 @@ static void handler_status(struct wiimote_data *wdata, const __u8 *payload)
static void handler_data(struct wiimote_data *wdata, const __u8 *payload)
{
__u16 offset = payload[3] << 8 | payload[4];
__u8 size = (payload[2] >> 4) + 1;
__u8 err = payload[2] & 0x0f;
handler_keys(wdata, payload);
if (wiimote_cmd_pending(wdata, WIIPROTO_REQ_RMEM, offset)) {
if (err)
size = 0;
else if (size > wdata->state.cmd_read_size)
size = wdata->state.cmd_read_size;
wdata->state.cmd_read_size = size;
if (wdata->state.cmd_read_buf)
memcpy(wdata->state.cmd_read_buf, &payload[5], size);
wiimote_cmd_complete(wdata);
}
}
static void handler_return(struct wiimote_data *wdata, const __u8 *payload)

4
drivers/hid/hid-wiimote.h
View File

@ -62,6 +62,8 @@ struct wiimote_state {
/* results of synchronous requests */
__u8 cmd_battery;
__u8 cmd_err;
__u8 *cmd_read_buf;
__u8 cmd_read_size;
};
struct wiimote_data {
@ -113,6 +115,8 @@ enum wiiproto_reqs {
extern void wiiproto_req_drm(struct wiimote_data *wdata, __u8 drm);
extern int wiimote_cmd_write(struct wiimote_data *wdata, __u32 offset,
const __u8 *wmem, __u8 size);
extern ssize_t wiimote_cmd_read(struct wiimote_data *wdata, __u32 offset,
__u8 *rmem, __u8 size);
/* requires the state.lock spinlock to be held */
static inline bool wiimote_cmd_pending(struct wiimote_data *wdata, int cmd,