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sparc64: vcc: Create sysfs attribute group 

Create sysfs attribute group to show the domain name and
send break command.

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jag Raman 2017-08-15 17:03:01 -04:00 committed by David S. Miller
parent 5d171050e2
commit 8868e44a56
1 changed files with 82 additions and 0 deletions
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82
drivers/tty/vcc.c
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@ -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 struct vio_version vcc_versions[] = {
{ .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) {