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Message-Id: <20170329174953.89247-1-cbostic@linux.vnet.ibm.com>
Date: Wed, 29 Mar 2017 12:49:53 -0500
From: Christopher Bostic <cbostic@...ux.vnet.ibm.com>
To: robh+dt@...nel.org, mark.rutland@....com, linux@...linux.org.uk,
rostedt@...dmis.org, mingo@...hat.com, gregkh@...uxfoundation.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc: Jeremy Kerr <jk@...abs.org>, joel@....id.au,
linux-kernel@...r.kernel.org, andrew@...id.au,
alistair@...ple.id.au, benh@...nel.crashing.org,
Chris Bostic <cbostic@...ux.net.ibm.com>
Subject: [PATCH v4 14/23] drivers/fsi: Add sysfs files for FSI master & slave accesses
From: Jeremy Kerr <jk@...abs.org>
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@...abs.org>
Signed-off-by: Joel Stanley <joel@....id.au>
Signed-off-by: Chris Bostic <cbostic@...ux.net.ibm.com>
---
drivers/fsi/fsi-core.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 116 insertions(+)
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 4359e26..f0f0556 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -294,6 +294,95 @@ 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)
{
@@ -409,6 +498,14 @@ 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);
+
fsi_slave_scan(slave);
return 0;
}
@@ -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;
--
1.8.2.2
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