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usb: gadget: u_serial: allow more console gadget ports

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Allow configuring more than one console using USB serial or ACM gadget.

By default, only first (ttyGS0) is a console, but this may be changed
using function's new "console" attribute.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Michał Mirosław
2019-08-10 10:42:51 +02:00
committed by Felipe Balbi
parent b417343c6a
commit d7cb8fb7aa
4 changed files with 97 additions and 0 deletions
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48
drivers/usb/gadget/function/u_serial.c
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@@ -1081,6 +1081,54 @@ static void gs_console_exit(struct gs_port *port)
port->console = NULL;
}
ssize_t gserial_set_console(unsigned char port_num, const char *page, size_t count)
{
struct gs_port *port;
bool enable;
int ret;
ret = strtobool(page, &enable);
if (ret)
return ret;
mutex_lock(&ports[port_num].lock);
port = ports[port_num].port;
if (WARN_ON(port == NULL)) {
ret = -ENXIO;
goto out;
}
if (enable)
ret = gs_console_init(port);
else
gs_console_exit(port);
out:
mutex_unlock(&ports[port_num].lock);
return ret < 0 ? ret : count;
}
EXPORT_SYMBOL_GPL(gserial_set_console);
ssize_t gserial_get_console(unsigned char port_num, char *page)
{
struct gs_port *port;
ssize_t ret;
mutex_lock(&ports[port_num].lock);
port = ports[port_num].port;
if (WARN_ON(port == NULL))
ret = -ENXIO;
else
ret = sprintf(page, "%u\n", !!port->console);
mutex_unlock(&ports[port_num].lock);
return ret;
}
EXPORT_SYMBOL_GPL(gserial_get_console);
#else
static int gs_console_connect(struct gs_port *port)