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Commit 8868e44a authored by Jag Raman's avatar Jag Raman Committed by David S. Miller
Browse files

sparc64: vcc: Create sysfs attribute group 



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

Signed-off-by: default avatarJagannathan Raman <jag.raman@oracle.com>
Reviewed-by: default avatarLiam Merwick <liam.merwick@oracle.com>
Reviewed-by: default avatarShannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5d171050

drivers/tty/vcc.c

+82 −0
Original line number Diff line number Diff line
@@ -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) {