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OpenCloudOS-Kernel
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Input: atmel_mxt_ts - simplify mxt_initialize a bit 

I think having control flow with 2 goto/labels/flags is quite hard to read,
this version is a bit more readable IMO.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
This commit is contained in:
Dmitry Torokhov 2014-08-08 09:28:45 -07:00
parent 23526d9497
commit 6cd1ab0fb6
1 changed files with 43 additions and 40 deletions
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83
drivers/input/touchscreen/atmel_mxt_ts.c
View File

@ -359,7 +359,6 @@ static int mxt_bootloader_read(struct mxt_data *data,
msg.buf = val;
ret = i2c_transfer(data->client->adapter, &msg, 1);
if (ret == 1) {
ret = 0;
} else {
@ -414,6 +413,7 @@ static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
case 0x5b:
bootloader = appmode - 0x26;
break;
default:
dev_err(&data->client->dev,
"Appmode i2c address 0x%02x not found\n",
@ -425,20 +425,20 @@ static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
return 0;
}
static int mxt_probe_bootloader(struct mxt_data *data, bool retry)
static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
{
struct device *dev = &data->client->dev;
int ret;
int error;
u8 val;
bool crc_failure;
ret = mxt_lookup_bootloader_address(data, retry);
if (ret)
return ret;
error = mxt_lookup_bootloader_address(data, alt_address);
if (error)
return error;
ret = mxt_bootloader_read(data, &val, 1);
if (ret)
return ret;
error = mxt_bootloader_read(data, &val, 1);
if (error)
return error;
/* Check app crc fail mode */
crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
@ -1645,41 +1645,39 @@ static void mxt_config_cb(const struct firmware *cfg, void *ctx)
static int mxt_initialize(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int recovery_attempts = 0;
int error;
bool alt_bootloader_addr = false;
bool retry = false;
retry_info:
error = mxt_get_info(data);
if (error) {
retry_bootloader:
error = mxt_probe_bootloader(data, alt_bootloader_addr);
while (1) {
error = mxt_get_info(data);
if (!error)
break;
/* Check bootloader state */
error = mxt_probe_bootloader(data, false);
if (error) {
if (alt_bootloader_addr) {
dev_info(&client->dev, "Trying alternate bootloader address\n");
error = mxt_probe_bootloader(data, true);
if (error) {
/* Chip is not in appmode or bootloader mode */
return error;
}
dev_info(&client->dev, "Trying alternate bootloader address\n");
alt_bootloader_addr = true;
goto retry_bootloader;
} else {
if (retry) {
dev_err(&client->dev, "Could not recover from bootloader mode\n");
/*
* We can reflash from this state, so do not
* abort init
*/
data->in_bootloader = true;
return 0;
}
/* Attempt to exit bootloader into app mode */
mxt_send_bootloader_cmd(data, false);
msleep(MXT_FW_RESET_TIME);
retry = true;
goto retry_info;
}
/* OK, we are in bootloader, see if we can recover */
if (++recovery_attempts > 1) {
dev_err(&client->dev, "Could not recover from bootloader mode\n");
/*
* We can reflash from this state, so do not
* abort initialization.
*/
data->in_bootloader = true;
return 0;
}
/* Attempt to exit bootloader into app mode */
mxt_send_bootloader_cmd(data, false);
msleep(MXT_FW_RESET_TIME);
}
/* Get object table information */
@ -1693,9 +1691,14 @@ retry_bootloader:
if (error)
goto err_free_object_table;
request_firmware_nowait(THIS_MODULE, true, MXT_CFG_NAME,
&data->client->dev, GFP_KERNEL, data,
mxt_config_cb);
error = request_firmware_nowait(THIS_MODULE, true, MXT_CFG_NAME,
&client->dev, GFP_KERNEL, data,
mxt_config_cb);
if (error) {
dev_err(&client->dev, "Failed to invoke firmware loader: %d\n",
error);
goto err_free_object_table;
}
return 0;