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drivers/fsi: Add sysfs files for FSI master & slave accesses 

This change adds a 'raw' file for reads & writes, and a 'term' file for
the TERM command, and a 'break' file for issuing a BREAK.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeremy Kerr 2017-06-06 16:08:49 -05:00 committed by Greg Kroah-Hartman
parent 356d8009a5
commit 125739cbc1
1 changed files with 116 additions and 0 deletions
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116
drivers/fsi/fsi-core.c
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@ -287,6 +287,95 @@ static int fsi_slave_scan(struct fsi_slave *slave)
return 0;
}
static ssize_t fsi_slave_sysfs_raw_read(struct file *file,
struct kobject *kobj, struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj));
size_t total_len, read_len;
int rc;
if (off < 0)
return -EINVAL;
if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
return -EINVAL;
for (total_len = 0; total_len < count; total_len += read_len) {
read_len = min_t(size_t, count, 4);
read_len -= off & 0x3;
rc = fsi_slave_read(slave, off, buf + total_len, read_len);
if (rc)
return rc;
off += read_len;
}
return count;
}
static ssize_t fsi_slave_sysfs_raw_write(struct file *file,
struct kobject *kobj, struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
{
struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj));
size_t total_len, write_len;
int rc;
if (off < 0)
return -EINVAL;
if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
return -EINVAL;
for (total_len = 0; total_len < count; total_len += write_len) {
write_len = min_t(size_t, count, 4);
write_len -= off & 0x3;
rc = fsi_slave_write(slave, off, buf + total_len, write_len);
if (rc)
return rc;
off += write_len;
}
return count;
}
static struct bin_attribute fsi_slave_raw_attr = {
.attr = {
.name = "raw",
.mode = 0600,
},
.size = 0,
.read = fsi_slave_sysfs_raw_read,
.write = fsi_slave_sysfs_raw_write,
};
static ssize_t fsi_slave_sysfs_term_write(struct file *file,
struct kobject *kobj, struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
{
struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj));
struct fsi_master *master = slave->master;
if (!master->term)
return -ENODEV;
master->term(master, slave->link, slave->id);
return count;
}
static struct bin_attribute fsi_slave_term_attr = {
.attr = {
.name = "term",
.mode = 0200,
},
.size = 0,
.write = fsi_slave_sysfs_term_write,
};
/* Encode slave local bus echo delay */
static inline uint32_t fsi_smode_echodly(int x)
{
@ -402,6 +491,14 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
return rc;
}
rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr);
if (rc)
dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc);
rc = device_create_bin_file(&slave->dev, &fsi_slave_term_attr);
if (rc)
dev_warn(&slave->dev, "failed to create term attr: %d\n", rc);
rc = fsi_slave_scan(slave);
if (rc)
dev_dbg(&master->dev, "failed during slave scan with: %d\n",
@ -523,6 +620,18 @@ static ssize_t master_rescan_store(struct device *dev,
static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store);
static ssize_t master_break_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct fsi_master *master = to_fsi_master(dev);
fsi_master_break(master, 0);
return count;
}
static DEVICE_ATTR(break, 0200, NULL, master_break_store);
int fsi_master_register(struct fsi_master *master)
{
int rc;
@ -546,6 +655,13 @@ int fsi_master_register(struct fsi_master *master)
return rc;
}
rc = device_create_file(&master->dev, &dev_attr_break);
if (rc) {
device_unregister(&master->dev);
ida_simple_remove(&master_ida, master->idx);
return rc;
}
fsi_master_scan(master);
return 0;