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-rw-r--r--drivers/usb/gadget/acm_ms.c10
-rw-r--r--drivers/usb/gadget/cdc2.c9
-rw-r--r--drivers/usb/gadget/dbgp.c10
-rw-r--r--drivers/usb/gadget/f_acm.c3
-rw-r--r--drivers/usb/gadget/f_obex.c4
-rw-r--r--drivers/usb/gadget/f_serial.c4
-rw-r--r--drivers/usb/gadget/multi.c12
-rw-r--r--drivers/usb/gadget/nokia.c37
-rw-r--r--drivers/usb/gadget/serial.c31
-rw-r--r--drivers/usb/gadget/u_serial.c310
-rw-r--r--drivers/usb/gadget/u_serial.h8
11 files changed, 229 insertions, 209 deletions
diff --git a/drivers/usb/gadget/acm_ms.c b/drivers/usb/gadget/acm_ms.c
index 35cbe7283514..eb0fbdae5ccb 100644
--- a/drivers/usb/gadget/acm_ms.c
+++ b/drivers/usb/gadget/acm_ms.c
@@ -111,6 +111,7 @@ FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
static struct fsg_common fsg_common;
/*-------------------------------------------------------------------------*/
+static unsigned char tty_line;
/*
* We _always_ have both ACM and mass storage functions.
@@ -125,7 +126,7 @@ static int __init acm_ms_do_config(struct usb_configuration *c)
}
- status = acm_bind_config(c, 0);
+ status = acm_bind_config(c, tty_line);
if (status < 0)
return status;
@@ -152,7 +153,7 @@ static int __init acm_ms_bind(struct usb_composite_dev *cdev)
void *retp;
/* set up serial link layer */
- status = gserial_setup(cdev->gadget, 1);
+ status = gserial_alloc_line(&tty_line);
if (status < 0)
return status;
@@ -188,14 +189,13 @@ static int __init acm_ms_bind(struct usb_composite_dev *cdev)
fail1:
fsg_common_put(&fsg_common);
fail0:
- gserial_cleanup();
+ gserial_free_line(tty_line);
return status;
}
static int __exit acm_ms_unbind(struct usb_composite_dev *cdev)
{
- gserial_cleanup();
-
+ gserial_free_line(tty_line);
return 0;
}
diff --git a/drivers/usb/gadget/cdc2.c b/drivers/usb/gadget/cdc2.c
index 379df679ef30..16911a5aeb03 100644
--- a/drivers/usb/gadget/cdc2.c
+++ b/drivers/usb/gadget/cdc2.c
@@ -108,6 +108,7 @@ static u8 hostaddr[ETH_ALEN];
/*-------------------------------------------------------------------------*/
+static unsigned char tty_line;
/*
* We _always_ have both CDC ECM and CDC ACM functions.
*/
@@ -124,7 +125,7 @@ static int __init cdc_do_config(struct usb_configuration *c)
if (status < 0)
return status;
- status = acm_bind_config(c, 0);
+ status = acm_bind_config(c, tty_line);
if (status < 0)
return status;
@@ -157,7 +158,7 @@ static int __init cdc_bind(struct usb_composite_dev *cdev)
return status;
/* set up serial link layer */
- status = gserial_setup(cdev->gadget, 1);
+ status = gserial_alloc_line(&tty_line);
if (status < 0)
goto fail0;
@@ -183,7 +184,7 @@ static int __init cdc_bind(struct usb_composite_dev *cdev)
return 0;
fail1:
- gserial_cleanup();
+ gserial_free_line(tty_line);
fail0:
gether_cleanup();
return status;
@@ -191,7 +192,7 @@ fail0:
static int __exit cdc_unbind(struct usb_composite_dev *cdev)
{
- gserial_cleanup();
+ gserial_free_line(tty_line);
gether_cleanup();
return 0;
}
diff --git a/drivers/usb/gadget/dbgp.c b/drivers/usb/gadget/dbgp.c
index 41eb98df5644..986fc511a2ed 100644
--- a/drivers/usb/gadget/dbgp.c
+++ b/drivers/usb/gadget/dbgp.c
@@ -231,6 +231,10 @@ static void dbgp_unbind(struct usb_gadget *gadget)
gadget->ep0->driver_data = NULL;
}
+#ifdef CONFIG_USB_G_DBGP_SERIAL
+static unsigned char tty_line;
+#endif
+
static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
{
int stp;
@@ -268,7 +272,7 @@ static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
dbgp.serial->in->desc = &i_desc;
dbgp.serial->out->desc = &o_desc;
- if (gserial_setup(gadget, 1) < 0) {
+ if (gserial_alloc_line(&tty_line)) {
stp = 3;
goto fail_3;
}
@@ -377,7 +381,7 @@ static int dbgp_setup(struct usb_gadget *gadget,
#ifdef CONFIG_USB_G_DBGP_PRINTK
err = dbgp_enable_ep();
#else
- err = gserial_connect(dbgp.serial, 0);
+ err = gserial_connect(dbgp.serial, tty_line);
#endif
if (err < 0)
goto fail;
@@ -420,7 +424,7 @@ static void __exit dbgp_exit(void)
{
usb_gadget_unregister_driver(&dbgp_driver);
#ifdef CONFIG_USB_G_DBGP_SERIAL
- gserial_cleanup();
+ gserial_free_line(tty_line);
#endif
}
diff --git a/drivers/usb/gadget/f_acm.c b/drivers/usb/gadget/f_acm.c
index d4a7c1912105..3178fa70916e 100644
--- a/drivers/usb/gadget/f_acm.c
+++ b/drivers/usb/gadget/f_acm.c
@@ -719,9 +719,6 @@ acm_unbind(struct usb_configuration *c, struct usb_function *f)
*
* Returns zero on success, else negative errno.
*
- * Caller must have called @gserial_setup() with enough ports to
- * handle all the ones it binds. Caller is also responsible
- * for calling @gserial_cleanup() before module unload.
*/
int acm_bind_config(struct usb_configuration *c, u8 port_num)
{
diff --git a/drivers/usb/gadget/f_obex.c b/drivers/usb/gadget/f_obex.c
index d8dd8782768c..36a004563b82 100644
--- a/drivers/usb/gadget/f_obex.c
+++ b/drivers/usb/gadget/f_obex.c
@@ -406,10 +406,6 @@ static inline bool can_support_obex(struct usb_configuration *c)
* Context: single threaded during gadget setup
*
* Returns zero on success, else negative errno.
- *
- * Caller must have called @gserial_setup() with enough ports to
- * handle all the ones it binds. Caller is also responsible
- * for calling @gserial_cleanup() before module unload.
*/
int __init obex_bind_config(struct usb_configuration *c, u8 port_num)
{
diff --git a/drivers/usb/gadget/f_serial.c b/drivers/usb/gadget/f_serial.c
index 98fa7795df5f..da33cfb3031d 100644
--- a/drivers/usb/gadget/f_serial.c
+++ b/drivers/usb/gadget/f_serial.c
@@ -260,10 +260,6 @@ gser_unbind(struct usb_configuration *c, struct usb_function *f)
* Context: single threaded during gadget setup
*
* Returns zero on success, else negative errno.
- *
- * Caller must have called @gserial_setup() with enough ports to
- * handle all the ones it binds. Caller is also responsible
- * for calling @gserial_cleanup() before module unload.
*/
int __init gser_bind_config(struct usb_configuration *c, u8 port_num)
{
diff --git a/drivers/usb/gadget/multi.c b/drivers/usb/gadget/multi.c
index 00667911100d..9ca0ac0334e7 100644
--- a/drivers/usb/gadget/multi.c
+++ b/drivers/usb/gadget/multi.c
@@ -136,6 +136,7 @@ static struct fsg_common fsg_common;
static u8 hostaddr[ETH_ALEN];
+static unsigned char tty_line;
/********** RNDIS **********/
@@ -154,7 +155,7 @@ static __init int rndis_do_config(struct usb_configuration *c)
if (ret < 0)
return ret;
- ret = acm_bind_config(c, 0);
+ ret = acm_bind_config(c, tty_line);
if (ret < 0)
return ret;
@@ -205,7 +206,7 @@ static __init int cdc_do_config(struct usb_configuration *c)
if (ret < 0)
return ret;
- ret = acm_bind_config(c, 0);
+ ret = acm_bind_config(c, tty_line);
if (ret < 0)
return ret;
@@ -242,7 +243,6 @@ static int cdc_config_register(struct usb_composite_dev *cdev)
/****************************** Gadget Bind ******************************/
-
static int __ref multi_bind(struct usb_composite_dev *cdev)
{
struct usb_gadget *gadget = cdev->gadget;
@@ -260,7 +260,7 @@ static int __ref multi_bind(struct usb_composite_dev *cdev)
return status;
/* set up serial link layer */
- status = gserial_setup(cdev->gadget, 1);
+ status = gserial_alloc_line(&tty_line);
if (status < 0)
goto fail0;
@@ -300,7 +300,7 @@ static int __ref multi_bind(struct usb_composite_dev *cdev)
fail2:
fsg_common_put(&fsg_common);
fail1:
- gserial_cleanup();
+ gserial_free_line(tty_line);
fail0:
gether_cleanup();
return status;
@@ -308,7 +308,7 @@ fail0:
static int __exit multi_unbind(struct usb_composite_dev *cdev)
{
- gserial_cleanup();
+ gserial_free_line(tty_line);
gether_cleanup();
return 0;
}
diff --git a/drivers/usb/gadget/nokia.c b/drivers/usb/gadget/nokia.c
index 48f0d5c372a8..084d0d7cb8fa 100644
--- a/drivers/usb/gadget/nokia.c
+++ b/drivers/usb/gadget/nokia.c
@@ -100,6 +100,15 @@ MODULE_LICENSE("GPL");
static u8 hostaddr[ETH_ALEN];
+enum {
+ TTY_PORT_OBEX0,
+ TTY_PORT_OBEX1,
+ TTY_PORT_ACM,
+ TTY_PORTS_MAX,
+};
+
+static unsigned char tty_lines[TTY_PORTS_MAX];
+
static int __init nokia_bind_config(struct usb_configuration *c)
{
int status = 0;
@@ -108,15 +117,15 @@ static int __init nokia_bind_config(struct usb_configuration *c)
if (status)
printk(KERN_DEBUG "could not bind phonet config\n");
- status = obex_bind_config(c, 0);
+ status = obex_bind_config(c, tty_lines[TTY_PORT_OBEX0]);
if (status)
printk(KERN_DEBUG "could not bind obex config %d\n", 0);
- status = obex_bind_config(c, 1);
+ status = obex_bind_config(c, tty_lines[TTY_PORT_OBEX1]);
if (status)
printk(KERN_DEBUG "could not bind obex config %d\n", 0);
- status = acm_bind_config(c, 2);
+ status = acm_bind_config(c, tty_lines[TTY_PORT_ACM]);
if (status)
printk(KERN_DEBUG "could not bind acm config\n");
@@ -147,14 +156,17 @@ static int __init nokia_bind(struct usb_composite_dev *cdev)
{
struct usb_gadget *gadget = cdev->gadget;
int status;
+ int cur_line;
status = gphonet_setup(cdev->gadget);
if (status < 0)
goto err_phonet;
- status = gserial_setup(cdev->gadget, 3);
- if (status < 0)
- goto err_serial;
+ for (cur_line = 0; cur_line < TTY_PORTS_MAX; cur_line++) {
+ status = gserial_alloc_line(&tty_lines[cur_line]);
+ if (status)
+ goto err_ether;
+ }
status = gether_setup(cdev->gadget, hostaddr);
if (status < 0)
@@ -191,8 +203,10 @@ static int __init nokia_bind(struct usb_composite_dev *cdev)
err_usb:
gether_cleanup();
err_ether:
- gserial_cleanup();
-err_serial:
+ cur_line--;
+ while (cur_line >= 0)
+ gserial_free_line(tty_lines[cur_line--]);
+
gphonet_cleanup();
err_phonet:
return status;
@@ -200,8 +214,13 @@ err_phonet:
static int __exit nokia_unbind(struct usb_composite_dev *cdev)
{
+ int i;
+
gphonet_cleanup();
- gserial_cleanup();
+
+ for (i = 0; i < TTY_PORTS_MAX; i++)
+ gserial_free_line(tty_lines[i]);
+
gether_cleanup();
return 0;
diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index 4816f494fc4d..a883562f6a89 100644
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -127,6 +127,7 @@ module_param(n_ports, uint, 0);
MODULE_PARM_DESC(n_ports, "number of ports to create, default=1");
/*-------------------------------------------------------------------------*/
+static unsigned char tty_lines[MAX_U_SERIAL_PORTS];
static int __init serial_bind_acm_config(struct usb_configuration *c)
{
@@ -134,7 +135,7 @@ static int __init serial_bind_acm_config(struct usb_configuration *c)
int status = 0;
for (i = 0; i < n_ports && status == 0; i++)
- status = acm_bind_config(c, i);
+ status = acm_bind_config(c, tty_lines[i]);
return status;
}
@@ -144,7 +145,7 @@ static int __init serial_bind_obex_config(struct usb_configuration *c)
int status = 0;
for (i = 0; i < n_ports && status == 0; i++)
- status = obex_bind_config(c, i);
+ status = obex_bind_config(c, tty_lines[i]);
return status;
}
@@ -154,7 +155,7 @@ static int __init serial_bind_gser_config(struct usb_configuration *c)
int status = 0;
for (i = 0; i < n_ports && status == 0; i++)
- status = gser_bind_config(c, i);
+ status = gser_bind_config(c, tty_lines[i]);
return status;
}
@@ -165,13 +166,25 @@ static struct usb_configuration serial_config_driver = {
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
};
+static int gs_unbind(struct usb_composite_dev *cdev)
+{
+ int i;
+
+ for (i = 0; i < n_ports; i++)
+ gserial_free_line(tty_lines[i]);
+ return 0;
+}
+
static int __init gs_bind(struct usb_composite_dev *cdev)
{
int status;
+ int cur_line;
- status = gserial_setup(cdev->gadget, n_ports);
- if (status < 0)
- return status;
+ for (cur_line = 0; cur_line < n_ports; cur_line++) {
+ status = gserial_alloc_line(&tty_lines[cur_line]);
+ if (status)
+ goto fail;
+ }
/* Allocate string descriptor numbers ... note that string
* contents can be overridden by the composite_dev glue.
@@ -209,7 +222,9 @@ static int __init gs_bind(struct usb_composite_dev *cdev)
return 0;
fail:
- gserial_cleanup();
+ cur_line--;
+ while (cur_line >= 0)
+ gserial_free_line(tty_lines[cur_line--]);
return status;
}
@@ -219,6 +234,7 @@ static __refdata struct usb_composite_driver gserial_driver = {
.strings = dev_strings,
.max_speed = USB_SPEED_SUPER,
.bind = gs_bind,
+ .unbind = gs_unbind,
};
static int __init init(void)
@@ -254,6 +270,5 @@ module_init(init);
static void __exit cleanup(void)
{
usb_composite_unregister(&gserial_driver);
- gserial_cleanup();
}
module_exit(cleanup);
diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index 1662d839a1d6..ea360fda2e14 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -36,11 +36,12 @@
* "serial port" functionality through the USB gadget stack. Each such
* port is exposed through a /dev/ttyGS* node.
*
- * After initialization (gserial_setup), these TTY port devices stay
- * available until they are removed (gserial_cleanup). Each one may be
- * connected to a USB function (gserial_connect), or disconnected (with
- * gserial_disconnect) when the USB host issues a config change event.
- * Data can only flow when the port is connected to the host.
+ * After this module has been loaded, the individual TTY port can be requested
+ * (gserial_alloc_line()) and it will stay available until they are removed
+ * (gserial_free_line()). Each one may be connected to a USB function
+ * (gserial_connect), or disconnected (with gserial_disconnect) when the USB
+ * host issues a config change event. Data can only flow when the port is
+ * connected to the host.
*
* A given TTY port can be made available in multiple configurations.
* For example, each one might expose a ttyGS0 node which provides a
@@ -120,13 +121,10 @@ struct gs_port {
struct usb_cdc_line_coding port_line_coding; /* 8-N-1 etc */
};
-/* increase N_PORTS if you need more */
-#define N_PORTS 4
static struct portmaster {
struct mutex lock; /* protect open/close */
struct gs_port *port;
-} ports[N_PORTS];
-static unsigned n_ports;
+} ports[MAX_U_SERIAL_PORTS];
#define GS_CLOSE_TIMEOUT 15 /* seconds */
@@ -1033,10 +1031,19 @@ static int
gs_port_alloc(unsigned port_num, struct usb_cdc_line_coding *coding)
{
struct gs_port *port;
+ int ret = 0;
+
+ mutex_lock(&ports[port_num].lock);
+ if (ports[port_num].port) {
+ ret = -EBUSY;
+ goto out;
+ }
port = kzalloc(sizeof(struct gs_port), GFP_KERNEL);
- if (port == NULL)
- return -ENOMEM;
+ if (port == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
tty_port_init(&port->port);
spin_lock_init(&port->port_lock);
@@ -1052,114 +1059,10 @@ gs_port_alloc(unsigned port_num, struct usb_cdc_line_coding *coding)
port->port_line_coding = *coding;
ports[port_num].port = port;
-
- return 0;
-}
-
-/**
- * gserial_setup - initialize TTY driver for one or more ports
- * @g: gadget to associate with these ports
- * @count: how many ports to support
- * Context: may sleep
- *
- * The TTY stack needs to know in advance how many devices it should
- * plan to manage. Use this call to set up the ports you will be
- * exporting through USB. Later, connect them to functions based
- * on what configuration is activated by the USB host; and disconnect
- * them as appropriate.
- *
- * An example would be a two-configuration device in which both
- * configurations expose port 0, but through different functions.
- * One configuration could even expose port 1 while the other
- * one doesn't.
- *
- * Returns negative errno or zero.
- */
-int gserial_setup(struct usb_gadget *g, unsigned count)
-{
- unsigned i;
- struct usb_cdc_line_coding coding;
- int status;
-
- if (count == 0 || count > N_PORTS)
- return -EINVAL;
-
- if (gs_tty_driver)
- return -EBUSY;
-
- gs_tty_driver = alloc_tty_driver(count);
- if (!gs_tty_driver)
- return -ENOMEM;
-
- gs_tty_driver->driver_name = "g_serial";
- gs_tty_driver->name = PREFIX;
- /* uses dynamically assigned dev_t values */
-
- gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
- gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
- gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
- gs_tty_driver->init_termios = tty_std_termios;
-
- /* 9600-8-N-1 ... matches defaults expected by "usbser.sys" on
- * MS-Windows. Otherwise, most of these flags shouldn't affect
- * anything unless we were to actually hook up to a serial line.
- */
- gs_tty_driver->init_termios.c_cflag =
- B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- gs_tty_driver->init_termios.c_ispeed = 9600;
- gs_tty_driver->init_termios.c_ospeed = 9600;
-
- coding.dwDTERate = cpu_to_le32(9600);
- coding.bCharFormat = 8;
- coding.bParityType = USB_CDC_NO_PARITY;
- coding.bDataBits = USB_CDC_1_STOP_BITS;
-
- tty_set_operations(gs_tty_driver, &gs_tty_ops);
-
- /* make devices be openable */
- for (i = 0; i < count; i++) {
- mutex_init(&ports[i].lock);
- status = gs_port_alloc(i, &coding);
- if (status) {
- count = i;
- goto fail;
- }
- }
- n_ports = count;
-
- /* export the driver ... */
- status = tty_register_driver(gs_tty_driver);
- if (status) {
- pr_err("%s: cannot register, err %d\n",
- __func__, status);
- goto fail;
- }
-
- /* ... and sysfs class devices, so mdev/udev make /dev/ttyGS* */
- for (i = 0; i < count; i++) {
- struct device *tty_dev;
-
- tty_dev = tty_port_register_device(&ports[i].port->port,
- gs_tty_driver, i, &g->dev);
- if (IS_ERR(tty_dev))
- pr_warning("%s: no classdev for port %d, err %ld\n",
- __func__, i, PTR_ERR(tty_dev));
- }
-
- pr_debug("%s: registered %d ttyGS* device%s\n", __func__,
- count, (count == 1) ? "" : "s");
-
- return status;
-fail:
- while (count--) {
- tty_port_destroy(&ports[count].port->port);
- kfree(ports[count].port);
- }
- put_tty_driver(gs_tty_driver);
- gs_tty_driver = NULL;
- return status;
+out:
+ mutex_unlock(&ports[port_num].lock);
+ return ret;
}
-EXPORT_SYMBOL_GPL(gserial_setup);
static int gs_closed(struct gs_port *port)
{
@@ -1171,56 +1074,77 @@ static int gs_closed(struct gs_port *port)
return cond;
}
-/**
- * gserial_cleanup - remove TTY-over-USB driver and devices
- * Context: may sleep
- *
- * This is called to free all resources allocated by @gserial_setup().
- * Accordingly, it may need to wait until some open /dev/ files have
- * closed.
- *
- * The caller must have issued @gserial_disconnect() for any ports
- * that had previously been connected, so that there is never any
- * I/O pending when it's called.
- */
-void gserial_cleanup(void)
+static void gserial_free_port(struct gs_port *port)
+{
+ tasklet_kill(&port->push);
+ /* wait for old opens to finish */
+ wait_event(port->port.close_wait, gs_closed(port));
+ WARN_ON(port->port_usb != NULL);
+ tty_port_destroy(&port->port);
+ kfree(port);
+}
+
+void gserial_free_line(unsigned char port_num)
{
- unsigned i;
struct gs_port *port;
- if (!gs_tty_driver)
+ mutex_lock(&ports[port_num].lock);
+ if (WARN_ON(!ports[port_num].port)) {
+ mutex_unlock(&ports[port_num].lock);
return;
+ }
+ port = ports[port_num].port;
+ ports[port_num].port = NULL;
+ mutex_unlock(&ports[port_num].lock);
- /* start sysfs and /dev/ttyGS* node removal */
- for (i = 0; i < n_ports; i++)
- tty_unregister_device(gs_tty_driver, i);
-
- for (i = 0; i < n_ports; i++) {
- /* prevent new opens */
- mutex_lock(&ports[i].lock);
- port = ports[i].port;
- ports[i].port = NULL;
- mutex_unlock(&ports[i].lock);
-
- tasklet_kill(&port->push);
+ gserial_free_port(port);
+ tty_unregister_device(gs_tty_driver, port_num);
+}
+EXPORT_SYMBOL_GPL(gserial_free_line);
- /* wait for old opens to finish */
- wait_event(port->port.close_wait, gs_closed(port));
+int gserial_alloc_line(unsigned char *line_num)
+{
+ struct usb_cdc_line_coding coding;
+ struct device *tty_dev;
+ int ret;
+ int port_num;
- WARN_ON(port->port_usb != NULL);
+ coding.dwDTERate = cpu_to_le32(9600);
+ coding.bCharFormat = 8;
+ coding.bParityType = USB_CDC_NO_PARITY;
+ coding.bDataBits = USB_CDC_1_STOP_BITS;
- tty_port_destroy(&port->port);
- kfree(port);
+ for (port_num = 0; port_num < MAX_U_SERIAL_PORTS; port_num++) {
+ ret = gs_port_alloc(port_num, &coding);
+ if (ret == -EBUSY)
+ continue;
+ if (ret)
+ return ret;
+ break;
}
- n_ports = 0;
+ if (ret)
+ return ret;
- tty_unregister_driver(gs_tty_driver);
- put_tty_driver(gs_tty_driver);
- gs_tty_driver = NULL;
+ /* ... and sysfs class devices, so mdev/udev make /dev/ttyGS* */
- pr_debug("%s: cleaned up ttyGS* support\n", __func__);
+ tty_dev = tty_port_register_device(&ports[port_num].port->port,
+ gs_tty_driver, port_num, NULL);
+ if (IS_ERR(tty_dev)) {
+ struct gs_port *port;
+ pr_err("%s: failed to register tty for port %d, err %ld\n",
+ __func__, port_num, PTR_ERR(tty_dev));
+
+ ret = PTR_ERR(tty_dev);
+ port = ports[port_num].port;
+ ports[port_num].port = NULL;
+ gserial_free_port(port);
+ goto err;
+ }
+ *line_num = port_num;
+err:
+ return ret;
}
-EXPORT_SYMBOL_GPL(gserial_cleanup);
+EXPORT_SYMBOL_GPL(gserial_alloc_line);
/**
* gserial_connect - notify TTY I/O glue that USB link is active
@@ -1237,8 +1161,8 @@ EXPORT_SYMBOL_GPL(gserial_cleanup);
*
* Caller needs to have set up the endpoints and USB function in @dev
* before calling this, as well as the appropriate (speed-specific)
- * endpoint descriptors, and also have set up the TTY driver by calling
- * @gserial_setup().
+ * endpoint descriptors, and also have allocate @port_num by calling
+ * @gserial_alloc_line().
*
* Returns negative errno or zero.
* On success, ep->driver_data will be overwritten.
@@ -1249,11 +1173,18 @@ int gserial_connect(struct gserial *gser, u8 port_num)
unsigned long flags;
int status;
- if (!gs_tty_driver || port_num >= n_ports)
+ if (port_num >= MAX_U_SERIAL_PORTS)
return -ENXIO;
- /* we "know" gserial_cleanup() hasn't been called */
port = ports[port_num].port;
+ if (!port) {
+ pr_err("serial line %d not allocated.\n", port_num);
+ return -EINVAL;
+ }
+ if (port->port_usb) {
+ pr_err("serial line %d is in use.\n", port_num);
+ return -EBUSY;
+ }
/* activate the endpoints */
status = usb_ep_enable(gser->in);
@@ -1357,4 +1288,63 @@ void gserial_disconnect(struct gserial *gser)
}
EXPORT_SYMBOL_GPL(gserial_disconnect);
+int userial_init(void)
+{
+ unsigned i;
+ int status;
+
+ gs_tty_driver = alloc_tty_driver(MAX_U_SERIAL_PORTS);
+ if (!gs_tty_driver)
+ return -ENOMEM;
+
+ gs_tty_driver->driver_name = "g_serial";
+ gs_tty_driver->name = PREFIX;
+ /* uses dynamically assigned dev_t values */
+
+ gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+ gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+ gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+ gs_tty_driver->init_termios = tty_std_termios;
+
+ /* 9600-8-N-1 ... matches defaults expected by "usbser.sys" on
+ * MS-Windows. Otherwise, most of these flags shouldn't affect
+ * anything unless we were to actually hook up to a serial line.
+ */
+ gs_tty_driver->init_termios.c_cflag =
+ B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ gs_tty_driver->init_termios.c_ispeed = 9600;
+ gs_tty_driver->init_termios.c_ospeed = 9600;
+
+ tty_set_operations(gs_tty_driver, &gs_tty_ops);
+ for (i = 0; i < MAX_U_SERIAL_PORTS; i++)
+ mutex_init(&ports[i].lock);
+
+ /* export the driver ... */
+ status = tty_register_driver(gs_tty_driver);
+ if (status) {
+ pr_err("%s: cannot register, err %d\n",
+ __func__, status);
+ goto fail;
+ }
+
+ pr_debug("%s: registered %d ttyGS* device%s\n", __func__,
+ MAX_U_SERIAL_PORTS,
+ (MAX_U_SERIAL_PORTS == 1) ? "" : "s");
+
+ return status;
+fail:
+ put_tty_driver(gs_tty_driver);
+ gs_tty_driver = NULL;
+ return status;
+}
+module_init(userial_init);
+
+static void userial_cleanup(void)
+{
+ tty_unregister_driver(gs_tty_driver);
+ put_tty_driver(gs_tty_driver);
+ gs_tty_driver = NULL;
+}
+module_exit(userial_cleanup);
+
MODULE_LICENSE("GPL");
diff --git a/drivers/usb/gadget/u_serial.h b/drivers/usb/gadget/u_serial.h
index 9b0fe6450fbf..f06ee9a5db51 100644
--- a/drivers/usb/gadget/u_serial.h
+++ b/drivers/usb/gadget/u_serial.h
@@ -15,6 +15,8 @@
#include <linux/usb/composite.h>
#include <linux/usb/cdc.h>
+#define MAX_U_SERIAL_PORTS 4
+
/*
* One non-multiplexed "serial" I/O port ... there can be several of these
* on any given USB peripheral device, if it provides enough endpoints.
@@ -49,9 +51,9 @@ struct gserial {
struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t flags);
void gs_free_req(struct usb_ep *, struct usb_request *req);
-/* port setup/teardown is handled by gadget driver */
-int gserial_setup(struct usb_gadget *g, unsigned n_ports);
-void gserial_cleanup(void);
+/* management of individual TTY ports */
+int gserial_alloc_line(unsigned char *port_line);
+void gserial_free_line(unsigned char port_line);
/* connect/disconnect is handled by individual functions */
int gserial_connect(struct gserial *, u8 port_num);
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-16 22:20:01 +0000