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USB: serial: f81534: only read configuration once

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In the original code, We'll read configuration in calc_num_ports()
and read again in attach(). In fact, we can move all content from
attach() to calc_num_ports() to simplify the code.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
[ johan: replace commit summary ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ji-Ze Hong (Peter Hong) 2018-01-11 14:47:18 +08:00 committed by Johan Hovold
parent 138651e118
commit f047d35782
1 changed files with 31 additions and 85 deletions
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116
drivers/usb/serial/f81534.c
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@ -753,14 +753,14 @@ static int f81534_find_config_idx(struct usb_serial *serial, u8 *index)
static int f81534_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds)
{
struct f81534_serial_private *serial_priv;
struct device *dev = &serial->interface->dev;
int size_bulk_in = usb_endpoint_maxp(epds->bulk_in[0]);
int size_bulk_out = usb_endpoint_maxp(epds->bulk_out[0]);
u8 setting[F81534_CUSTOM_DATA_SIZE];
u8 setting_idx;
u8 num_port = 0;
int index = 0;
int status;
size_t i;
int i;
if (size_bulk_out != F81534_WRITE_BUFFER_SIZE ||
size_bulk_in != F81534_MAX_RECEIVE_BLOCK_SIZE) {
@ -768,8 +768,16 @@ static int f81534_calc_num_ports(struct usb_serial *serial,
return -ENODEV;
}
serial_priv = devm_kzalloc(&serial->interface->dev,
sizeof(*serial_priv), GFP_KERNEL);
if (!serial_priv)
return -ENOMEM;
usb_set_serial_data(serial, serial_priv);
mutex_init(&serial_priv->urb_mutex);
/* Check had custom setting */
status = f81534_find_config_idx(serial, &setting_idx);
status = f81534_find_config_idx(serial, &serial_priv->setting_idx);
if (status) {
dev_err(&serial->interface->dev, "%s: find idx failed: %d\n",
__func__, status);
@ -780,11 +788,12 @@ static int f81534_calc_num_ports(struct usb_serial *serial,
* We'll read custom data only when data available, otherwise we'll
* read default value instead.
*/
if (setting_idx != F81534_CUSTOM_NO_CUSTOM_DATA) {
if (serial_priv->setting_idx != F81534_CUSTOM_NO_CUSTOM_DATA) {
status = f81534_read_flash(serial,
F81534_CUSTOM_ADDRESS_START +
F81534_CONF_OFFSET,
sizeof(setting), setting);
sizeof(serial_priv->conf_data),
serial_priv->conf_data);
if (status) {
dev_err(&serial->interface->dev,
"%s: get custom data failed: %d\n",
@ -794,13 +803,13 @@ static int f81534_calc_num_ports(struct usb_serial *serial,
dev_dbg(&serial->interface->dev,
"%s: read config from block: %d\n", __func__,
setting_idx);
serial_priv->setting_idx);
} else {
/* Read default board setting */
status = f81534_read_flash(serial,
F81534_DEF_CONF_ADDRESS_START, F81534_NUM_PORT,
setting);
F81534_DEF_CONF_ADDRESS_START,
sizeof(serial_priv->conf_data),
serial_priv->conf_data);
if (status) {
dev_err(&serial->interface->dev,
"%s: read failed: %d\n", __func__,
@ -814,7 +823,7 @@ static int f81534_calc_num_ports(struct usb_serial *serial,
/* New style, find all possible ports */
for (i = 0; i < F81534_NUM_PORT; ++i) {
if (setting[i] & F81534_PORT_UNAVAILABLE)
if (serial_priv->conf_data[i] & F81534_PORT_UNAVAILABLE)
continue;
++num_port;
@ -826,6 +835,17 @@ static int f81534_calc_num_ports(struct usb_serial *serial,
num_port = 4; /* Nothing found, oldest version IC */
}
/* Assign phy-to-logic mapping */
for (i = 0; i < F81534_NUM_PORT; ++i) {
if (serial_priv->conf_data[i] & F81534_PORT_UNAVAILABLE)
continue;
serial_priv->tty_idx[i] = index++;
dev_dbg(&serial->interface->dev,
"%s: phy_num: %d, tty_idx: %d\n", __func__, i,
serial_priv->tty_idx[i]);
}
/*
* Setup bulk-out endpoint multiplexing. All ports share the same
* bulk-out endpoint.
@ -1227,79 +1247,6 @@ static void f81534_write_usb_callback(struct urb *urb)
}
}
static int f81534_attach(struct usb_serial *serial)
{
struct f81534_serial_private *serial_priv;
int index = 0;
int status;
int i;
serial_priv = devm_kzalloc(&serial->interface->dev,
sizeof(*serial_priv), GFP_KERNEL);
if (!serial_priv)
return -ENOMEM;
usb_set_serial_data(serial, serial_priv);
mutex_init(&serial_priv->urb_mutex);
/* Check had custom setting */
status = f81534_find_config_idx(serial, &serial_priv->setting_idx);
if (status) {
dev_err(&serial->interface->dev, "%s: find idx failed: %d\n",
__func__, status);
return status;
}
/*
* We'll read custom data only when data available, otherwise we'll
* read default value instead.
*/
if (serial_priv->setting_idx == F81534_CUSTOM_NO_CUSTOM_DATA) {
/*
* The default configuration layout:
* byte 0/1/2/3: uart setting
*/
status = f81534_read_flash(serial,
F81534_DEF_CONF_ADDRESS_START,
F81534_DEF_CONF_SIZE,
serial_priv->conf_data);
if (status) {
dev_err(&serial->interface->dev,
"%s: read reserve data failed: %d\n",
__func__, status);
return status;
}
} else {
/* Only read 8 bytes for mode & GPIO */
status = f81534_read_flash(serial,
F81534_CUSTOM_ADDRESS_START +
F81534_CONF_OFFSET,
sizeof(serial_priv->conf_data),
serial_priv->conf_data);
if (status) {
dev_err(&serial->interface->dev,
"%s: idx: %d get data failed: %d\n",
__func__, serial_priv->setting_idx,
status);
return status;
}
}
/* Assign phy-to-logic mapping */
for (i = 0; i < F81534_NUM_PORT; ++i) {
if (serial_priv->conf_data[i] & F81534_PORT_UNAVAILABLE)
continue;
serial_priv->tty_idx[i] = index++;
dev_dbg(&serial->interface->dev,
"%s: phy_num: %d, tty_idx: %d\n", __func__, i,
serial_priv->tty_idx[i]);
}
return 0;
}
static void f81534_lsr_worker(struct work_struct *work)
{
struct f81534_port_private *port_priv;
@ -1543,7 +1490,6 @@ static struct usb_serial_driver f81534_device = {
.write = f81534_write,
.tx_empty = f81534_tx_empty,
.calc_num_ports = f81534_calc_num_ports,
.attach = f81534_attach,
.port_probe = f81534_port_probe,
.port_remove = f81534_port_remove,
.break_ctl = f81534_break_ctl,