From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: linux-usb@vger.kernel.org
Cc: Felipe Balbi <balbi@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ladislav Michl <ladis@linux-mips.org>
Subject: [PATCH v4 6/6] USB: gadget: legacy/serial: allow dynamic removal
Date: Mon, 22 Jul 2019 17:14:39 +0200 [thread overview]
Message-ID: <728d64c793a7aade68fb9d3488ba017492f8eded.1563808218.git.mirq-linux@rere.qmqm.pl> (raw)
In-Reply-To: <cover.1563808218.git.mirq-linux@rere.qmqm.pl>
Legacy serial USB gadget is still useful as an early console,
before userspace is up. Later it could be replaced with proper
configfs-configured composite gadget - that use case is enabled
by this patch.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
v4: initial revision, new in the patchset
---
drivers/usb/gadget/legacy/serial.c | 49 +++++++++++++++++++++++++++++-
1 file changed, 48 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/legacy/serial.c b/drivers/usb/gadget/legacy/serial.c
index de30d7628eef..da44f89f5e73 100644
--- a/drivers/usb/gadget/legacy/serial.c
+++ b/drivers/usb/gadget/legacy/serial.c
@@ -97,6 +97,36 @@ static unsigned n_ports = 1;
module_param(n_ports, uint, 0);
MODULE_PARM_DESC(n_ports, "number of ports to create, default=1");
+static bool enable = true;
+
+static int switch_gserial_enable(bool do_enable);
+
+static int enable_set(const char *s, const struct kernel_param *kp)
+{
+ bool do_enable;
+ int ret;
+
+ if (!s) /* called for no-arg enable == default */
+ return 0;
+
+ ret = strtobool(s, &do_enable);
+ if (ret || enable == do_enable)
+ return ret;
+
+ ret = switch_gserial_enable(do_enable);
+ if (!ret)
+ enable = do_enable;
+
+ return ret;
+}
+
+static const struct kernel_param_ops enable_ops = {
+ .set = enable_set,
+ .get = param_get_bool,
+};
+
+module_param_cb(enable, &enable_ops, &enable, 0644);
+
/*-------------------------------------------------------------------------*/
static struct usb_configuration serial_config_driver = {
@@ -240,6 +270,19 @@ static struct usb_composite_driver gserial_driver = {
.unbind = gs_unbind,
};
+static int switch_gserial_enable(bool do_enable)
+{
+ if (!serial_config_driver.label)
+ /* init() was not called, yet */
+ return 0;
+
+ if (do_enable)
+ return usb_composite_probe(&gserial_driver);
+
+ usb_composite_unregister(&gserial_driver);
+ return 0;
+}
+
static int __init init(void)
{
/* We *could* export two configs; that'd be much cleaner...
@@ -266,12 +309,16 @@ static int __init init(void)
}
strings_dev[STRING_DESCRIPTION_IDX].s = serial_config_driver.label;
+ if (!enable)
+ return 0;
+
return usb_composite_probe(&gserial_driver);
}
module_init(init);
static void __exit cleanup(void)
{
- usb_composite_unregister(&gserial_driver);
+ if (enable)
+ usb_composite_unregister(&gserial_driver);
}
module_exit(cleanup);
--
2.20.1
next prev parent reply other threads:[~2019-07-22 15:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-22 15:14 [PATCH v4 0/6] usb: gadget: u_serial: console improvements Michał Mirosław
2019-07-22 15:14 ` [PATCH v4 2/6] usb: gadget: u_serial: reimplement console support Michał Mirosław
2019-07-22 15:14 ` [PATCH v4 3/6] usb: gadget: u_serial: make OBEX port not a console Michał Mirosław
2019-07-22 15:14 ` [PATCH v4 1/6] usb: gadget: u_serial: add missing port entry locking Michał Mirosław
2019-07-22 15:14 ` [PATCH v4 5/6] usb: gadget: u_serial: diagnose missed console messages Michał Mirosław
2019-07-22 15:14 ` Michał Mirosław [this message]
2019-07-22 15:14 ` [PATCH v4 4/6] usb: gadget: u_serial: allow more console gadget ports Michał Mirosław
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