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author | David Herrmann <dh.herrmann@googlemail.com> | 2011-11-17 13:12:00 (GMT) |
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committer | Jiri Kosina <jkosina@suse.cz> | 2011-11-22 22:08:09 (GMT) |
commit | fad8c0e34323eb7789f93750258a2cf02dc6cf69 (patch) | |
tree | bb2b0f3b89fa751702dec42681cdb1bf206d0259 /drivers/hid/hid-wiimote-core.c | |
parent | 7e274400629fbf8eab294fef39c3efde463966a9 (diff) | |
download | linux-fad8c0e34323eb7789f93750258a2cf02dc6cf69.tar.xz |
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>
Diffstat (limited to 'drivers/hid/hid-wiimote-core.c')
-rw-r--r-- | drivers/hid/hid-wiimote-core.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c index c955d50..f7f8b7f 100644 --- a/drivers/hid/hid-wiimote-core.c +++ b/drivers/hid/hid-wiimote-core.c @@ -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) |