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/*
* Remote Processor Procedure Call Driver
*
* Copyright(c) 2012-2015 Texas Instruments. All rights reserved.
*
* Erik Rainey <erik.rainey@ti.com>
* Suman Anna <s-anna@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/rpmsg_rpc.h>
#include "rpmsg_rpc_internal.h"
static ssize_t show_numfuncs(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct rppc_device *rppcdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%u\n", rppcdev->num_funcs - 1);
}
static ssize_t set_type_c(char *buf, uint32_t len,
struct rppc_param_signature *psig)
{
char *isptr = (psig->type & RPPC_PARAM_PTR ? " *" : "");
switch (psig->type & RPPC_PARAM_MASK) {
case RPPC_PARAM_S08:
return snprintf(buf, len, "int8_t%s", isptr);
case RPPC_PARAM_U08:
return snprintf(buf, len, "uint8_t%s", isptr);
case RPPC_PARAM_S16:
return snprintf(buf, len, "int16_t%s", isptr);
case RPPC_PARAM_U16:
return snprintf(buf, len, "uint16_t%s", isptr);
case RPPC_PARAM_S32:
return snprintf(buf, len, "int32_t%s", isptr);
case RPPC_PARAM_U32:
return snprintf(buf, len, "uint32_t%s", isptr);
case RPPC_PARAM_S64:
return snprintf(buf, len, "int64_t%s", isptr);
case RPPC_PARAM_U64:
return snprintf(buf, len, "uint64_t%s", isptr);
default:
return snprintf(buf, len, "<unknown>%s", isptr);
}
}
static ssize_t set_type_doxy(char *buf, uint32_t len,
struct rppc_param_signature *psig)
{
char *isptr = (psig->type & RPPC_PARAM_PTR ? " *" : "");
char dir[10];
switch (psig->direction) {
case RPPC_PARAMDIR_IN:
snprintf(dir, sizeof(dir), "[in]");
break;
case RPPC_PARAMDIR_OUT:
snprintf(dir, sizeof(dir), "[out]");
break;
case RPPC_PARAMDIR_BI:
snprintf(dir, sizeof(dir), "[in,out]");
break;
default:
snprintf(dir, sizeof(dir), "[unknown]");
break;
}
switch (psig->type & RPPC_PARAM_MASK) {
case RPPC_PARAM_S08:
return snprintf(buf, len, "%s int8_t%s", dir, isptr);
case RPPC_PARAM_U08:
return snprintf(buf, len, "%s uint8_t%s", dir, isptr);
case RPPC_PARAM_S16:
return snprintf(buf, len, "%s int16_t%s", dir, isptr);
case RPPC_PARAM_U16:
return snprintf(buf, len, "%s uint16_t%s", dir, isptr);
case RPPC_PARAM_S32:
return snprintf(buf, len, "%s int32_t%s", dir, isptr);
case RPPC_PARAM_U32:
return snprintf(buf, len, "%s uint32_t%s", dir, isptr);
case RPPC_PARAM_S64:
return snprintf(buf, len, "%s int64_t%s", dir, isptr);
case RPPC_PARAM_U64:
return snprintf(buf, len, "%s uint64_t%s", dir, isptr);
default:
return snprintf(buf, len, "%s <unknown>%s", dir, isptr);
}
}
static ssize_t show_c_function(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rppc_device *rppcdev = dev_get_drvdata(dev);
char return_value[11]; /* longest string is strlen("uintXX_t *") = 10 */
char parameters[110]; /* longest string * 10 + 9(,) */
char comment[300];
int p;
ssize_t pidx = 0;
ssize_t cidx = 0;
__u32 index = 0;
if (sscanf(attr->attr.name, "c_function%u\n", &index) != 1)
return -EIO;
memset(return_value, 0, sizeof(return_value));
memset(parameters, 0, sizeof(parameters));
strcpy(return_value, "void");
strcpy(parameters, "void");
cidx += snprintf(&comment[cidx], sizeof(comment) - cidx, "/**\n");
cidx += snprintf(&comment[cidx], sizeof(comment) - cidx,
" * \\fn %s\n", rppcdev->signatures[index].name);
for (p = 0; p < rppcdev->signatures[index].num_param; p++) {
if (p == 0) {
set_type_c(return_value, sizeof(return_value),
&rppcdev->signatures[index].params[0]);
cidx += snprintf(&comment[cidx], sizeof(comment) - cidx,
" * \\return %s\n", return_value);
} else {
pidx += set_type_c(¶meters[pidx],
sizeof(parameters) - pidx,
&rppcdev->signatures[index].params[p]);
if (p != rppcdev->signatures[index].num_param - 1)
parameters[pidx++] = ',';
cidx += snprintf(&comment[cidx], sizeof(comment) - cidx,
" * \\param ");
cidx += set_type_doxy(&comment[cidx],
sizeof(comment) - cidx,
&rppcdev->signatures[index].params[p]);
cidx += snprintf(&comment[cidx], sizeof(comment) - cidx,
"\n");
}
}
if (p <= 1)
pidx += strlen("void");
if (pidx < sizeof(parameters))
parameters[pidx] = '\0';
cidx += snprintf(&comment[cidx], sizeof(comment) - cidx, " */");
return snprintf(buf, PAGE_SIZE, "%s\nextern \"C\" %s %s(%s);\n",
comment, return_value, rppcdev->signatures[index].name,
parameters);
}
static struct device_attribute rppc_attrs[] = {
__ATTR(num_funcs, S_IRUGO, show_numfuncs, NULL),
};
/**
* rppc_create_sysfs - Creates the sysfs entry structures for the instance
* @rppcdev: the rppc device (remote server instance) handle
*
* Helper function to create all the sysfs entries associated with a rppc
* device. Each device is associated with a number of remote procedure
* functions. The number of such functions and the signatures of those
* functions are created in sysfs. Function is invoked after querying
* the remote side about the supported functions on this device.
*
* The entries are split into a set of static entries, which are common
* between all rppc devices, and a set of dynamic entries specific to
* each rppc device.
*
* Return: 0 on success, or an appropriate error code otherwise
*/
int rppc_create_sysfs(struct rppc_device *rppcdev)
{
int i;
int ret;
rppcdev->sig_attr = kzalloc(sizeof(*rppcdev->sig_attr) *
rppcdev->num_funcs, GFP_KERNEL);
if (!rppcdev->sig_attr)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(rppc_attrs); i++) {
ret = device_create_file(rppcdev->dev, &rppc_attrs[i]);
if (ret) {
dev_err(rppcdev->dev, "failed to create sysfs entry\n");
goto clean_static_entries;
}
}
for (i = 1; i < rppcdev->num_funcs; i++) {
sysfs_attr_init(&rppcdev->sig_attr[i].attr);
rppcdev->sig_attr[i].attr.name =
kzalloc(RPPC_MAX_FUNC_NAMELEN, GFP_KERNEL);
if (!rppcdev->sig_attr[i].attr.name) {
ret = -ENOMEM;
goto clean_dynamic_entries;
}
snprintf((char *)rppcdev->sig_attr[i].attr.name,
RPPC_MAX_FUNC_NAMELEN, "c_function%u", i);
rppcdev->sig_attr[i].attr.mode = S_IRUGO;
rppcdev->sig_attr[i].show = show_c_function;
rppcdev->sig_attr[i].store = NULL;
ret = device_create_file(rppcdev->dev, &rppcdev->sig_attr[i]);
if (ret) {
dev_err(rppcdev->dev, "failed to create sysfs function entry (%d)\n",
ret);
goto clean_dynamic_entries;
}
}
return 0;
clean_dynamic_entries:
while (i-- > 1) {
device_remove_file(rppcdev->dev, &rppcdev->sig_attr[i]);
kfree(rppcdev->sig_attr[i].attr.name);
}
i = ARRAY_SIZE(rppc_attrs);
clean_static_entries:
while (i-- > 0)
device_remove_file(rppcdev->dev, &rppc_attrs[i]);
kfree(rppcdev->sig_attr);
return ret;
}
/**
* rppc_remove_sysfs: Removes the sysfs entry structures for the instance
* @rppcdev: the rppc device (remote server instance) handle
*
* Helper function to remove all the sysfs entries associated with the
* rppc device.
*
* Return: 0 on success, or an appropriate error code otherwise
*/
int rppc_remove_sysfs(struct rppc_device *rppcdev)
{
int i;
if (rppcdev->sig_attr) {
for (i = 1; i < rppcdev->num_funcs; i++) {
device_remove_file(rppcdev->dev, &rppcdev->sig_attr[i]);
kfree(rppcdev->sig_attr[i].attr.name);
}
}
kfree(rppcdev->sig_attr);
for (i = 0; i < ARRAY_SIZE(rppc_attrs); i++)
device_remove_file(rppcdev->dev, &rppc_attrs[i]);
return 0;
}
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