Create sysfs attribute group to show the domain name and
send break command.
Signed-off-by: Jagannathan Raman <jag.raman@xxxxxxxxxx>
Reviewed-by: Liam Merwick <liam.merwick@xxxxxxxxxx>
Reviewed-by: Shannon Nelson <shannon.nelson@xxxxxxxxxx>
---
v2: remove sysfs attr group during cleanup
drivers/tty/vcc.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 82 insertions(+), 0 deletions(-)
diff --git a/drivers/tty/vcc.c b/drivers/tty/vcc.c
index 4edace1..72e0879 100644
--- a/drivers/tty/vcc.c
+++ b/drivers/tty/vcc.c
@@ -7,6 +7,7 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/sysfs.h>
#include <linux/tty.h>
#include <asm/vio.h>
#include <asm/ldc.h>
@@ -52,6 +53,9 @@ struct vcc_port {
#define VCC_MAX_PORTS 1024
#define VCC_MINOR_START 0 /* must be zero */
+#define VCC_CTL_BREAK -1
+#define VCC_CTL_HUP -2
+
static const char vcc_driver_name[] = "vcc";
static const char vcc_device_node[] = "vcc";
static struct tty_driver *vcc_tty_driver;
@@ -268,6 +272,77 @@ static void vcc_event(void *arg, int event)
{ .major = 1, .minor = 0 },
};
+static ssize_t vcc_sysfs_domain_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct vcc_port *port;
+ int rv;
+
+ port = dev_get_drvdata(dev);
+ if (!port)
+ return -ENODEV;
+
+ rv = scnprintf(buf, PAGE_SIZE, "%s\n", port->domain);
+
+ return rv;
+}
+
+static int vcc_send_ctl(struct vcc_port *port, int ctl)
+{
+ struct vio_vcc pkt;
+ int rv;
+
+ pkt.tag.type = VIO_TYPE_CTRL;
+ pkt.tag.sid = ctl;
+ pkt.tag.stype = 0;
+
+ rv = ldc_write(port->vio.lp, &pkt, sizeof(pkt.tag));
+ WARN_ON(!rv);
+ vccdbg("VCC: ldc_write(%ld)=%d\n", sizeof(pkt.tag), rv);
+
+ return rv;
+}
+
+static ssize_t vcc_sysfs_break_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct vcc_port *port;
+ unsigned long flags;
+ int rv = count;
+ int brk;
+
+ port = dev_get_drvdata(dev);
+ if (!port)
+ return -ENODEV;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ if (sscanf(buf, "%ud", &brk) != 1 || brk != 1)
+ rv = -EINVAL;
+ else if (vcc_send_ctl(port, VCC_CTL_BREAK) < 0)
+ pr_err("VCC: unable to send CTL_BREAK\n");
+
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ return rv;
+}
+
+static DEVICE_ATTR(domain, 0400, vcc_sysfs_domain_show, NULL);
+static DEVICE_ATTR(break, 0200, NULL, vcc_sysfs_break_store);
+
+static struct attribute *vcc_sysfs_entries[] = {
+ &dev_attr_domain.attr,
+ &dev_attr_break.attr,
+ NULL
+};
+
+static struct attribute_group vcc_attribute_group = {
+ .name = NULL,
+ .attrs = vcc_sysfs_entries,
+};
+
/**
* vcc_probe() - Initialize VCC port
* @vdev: Pointer to VIO device of the new VCC port
@@ -349,6 +424,10 @@ static int vcc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
mdesc_release(hp);
+ rv = sysfs_create_group(&vdev->dev.kobj, &vcc_attribute_group);
+ if (rv)
+ goto free_domain;
+
dev_set_drvdata(&vdev->dev, port);
/* It's possible to receive IRQs in the middle of vio_port_up. Disable
@@ -360,6 +439,8 @@ static int vcc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
return 0;
+free_domain:
+ kfree(port->domain);
unreg_tty:
tty_unregister_device(vcc_tty_driver, port->index);
free_table:
@@ -408,6 +489,7 @@ static int vcc_remove(struct vio_dev *vdev)
del_timer_sync(&port->vio.timer);
vio_ldc_free(&port->vio);
+ sysfs_remove_group(&vdev->dev.kobj, &vcc_attribute_group);
dev_set_drvdata(&vdev->dev, NULL);
if (port->tty) {
--
1.7.1
--
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