staging: most: core: fix sysfs attribute management
This patch creates a new attribute group to manage the attributes of a registered aim module in sysfs and changes the show and store functions accordingly. Signed-off-by: Christian Gromm <christian.gromm@microchip.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm
Greg Kroah-Hartman
parent
a6404e6e5a
commit
bdafb7e83b
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@ -534,28 +534,57 @@ static const struct attribute_group *interface_attr_groups[] = {
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/* ___ ___
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* ___A I M___
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*/
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static ssize_t links_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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static struct most_aim *match_module(char *name)
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{
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struct most_aim *aim;
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list_for_each_entry(aim, &mc.mod_list, list) {
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if (!strcmp(aim->name, name))
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return aim;
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}
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return NULL;
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}
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static ssize_t links_show(struct device_driver *drv, char *buf)
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{
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struct most_channel *c;
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struct most_inst_obj *i;
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struct most_aim *aim = to_most_aim(dev);
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int offs = 0;
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list_for_each_entry(i, &instance_list, list) {
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list_for_each_entry(c, &i->channel_list, list) {
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if (c->pipe0.aim == aim || c->pipe1.aim == aim) {
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offs += snprintf(buf + offs, PAGE_SIZE - offs,
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"%s:%s\n",
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if (c->pipe0.aim) {
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offs += snprintf(buf + offs,
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PAGE_SIZE - offs,
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"%s:%s:%s\n",
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c->pipe0.aim->name,
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dev_name(&i->iface->dev),
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dev_name(&c->dev));
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}
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if (c->pipe1.aim) {
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offs += snprintf(buf + offs,
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PAGE_SIZE - offs,
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"%s:%s:%s\n",
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c->pipe1.aim->name,
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dev_name(&i->iface->dev),
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dev_name(&c->dev));
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}
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}
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}
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return offs;
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}
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static ssize_t modules_show(struct device_driver *drv, char *buf)
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{
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struct most_aim *aim;
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int offs = 0;
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list_for_each_entry(aim, &mc.mod_list, list) {
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offs += snprintf(buf + offs, PAGE_SIZE - offs, "%s\n",
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aim->name);
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}
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return offs;
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}
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/**
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* split_string - parses and changes string in the buffer buf and
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* splits it into two mandatory and one optional substrings.
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@ -578,7 +607,7 @@ static ssize_t links_show(struct device *dev, struct device_attribute *attr,
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* Input: "mdev1:ep81"
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* Output: *a -> "mdev1", *b -> "ep81", *c == NULL
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*/
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static int split_string(char *buf, char **a, char **b, char **c)
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static int split_string(char *buf, char **a, char **b, char **c, char **d)
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{
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*a = strsep(&buf, ":");
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if (!*a)
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@ -588,8 +617,12 @@ static int split_string(char *buf, char **a, char **b, char **c)
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if (!*b)
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return -EIO;
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if (c)
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*c = strsep(&buf, ":\n");
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*c = strsep(&buf, ":\n");
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if (!*c)
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return -EIO;
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if (d)
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*d = strsep(&buf, ":\n");
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return 0;
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}
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@ -674,38 +707,38 @@ inline int link_channel_to_aim(struct most_channel *c, struct most_aim *aim,
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* (1) would create the device node /dev/my_rxchannel
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* (2) would create the device node /dev/mdev1-ep81
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*/
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static ssize_t add_link_store(struct device *dev,
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struct device_attribute *attr,
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static ssize_t add_link_store(struct device_driver *drv,
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const char *buf,
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size_t len)
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{
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struct most_channel *c;
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struct most_aim *aim = to_most_aim(dev);
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struct most_aim *aim;
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char buffer[STRING_SIZE];
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char *mdev;
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char *mdev_ch;
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char *mdev_devnod;
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char *aim_name;
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char *aim_param;
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char devnod_buf[STRING_SIZE];
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int ret;
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size_t max_len = min_t(size_t, len + 1, STRING_SIZE);
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strlcpy(buffer, buf, max_len);
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ret = split_string(buffer, &mdev, &mdev_ch, &mdev_devnod);
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ret = split_string(buffer, &mdev, &mdev_ch, &aim_name, &aim_param);
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if (ret)
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return ret;
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if (!mdev_devnod || *mdev_devnod == 0) {
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aim = match_module(aim_name);
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if (!aim_param || *aim_param == 0) {
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snprintf(devnod_buf, sizeof(devnod_buf), "%s-%s", mdev,
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mdev_ch);
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mdev_devnod = devnod_buf;
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aim_param = devnod_buf;
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}
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c = get_channel_by_name(mdev, mdev_ch);
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if (IS_ERR(c))
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return -ENODEV;
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ret = link_channel_to_aim(c, aim, mdev_devnod);
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ret = link_channel_to_aim(c, aim, aim_param);
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if (ret)
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return ret;
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@ -722,24 +755,24 @@ static ssize_t add_link_store(struct device *dev,
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* Example:
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* echo "mdev0:ep81" >remove_link
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*/
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static ssize_t remove_link_store(struct device *dev,
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struct device_attribute *attr,
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static ssize_t remove_link_store(struct device_driver *drv,
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const char *buf,
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size_t len)
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{
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struct most_channel *c;
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struct most_aim *aim = to_most_aim(dev);
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struct most_aim *aim;
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char buffer[STRING_SIZE];
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char *mdev;
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char *mdev_ch;
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char *aim_name;
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int ret;
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size_t max_len = min_t(size_t, len + 1, STRING_SIZE);
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strlcpy(buffer, buf, max_len);
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ret = split_string(buffer, &mdev, &mdev_ch, NULL);
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ret = split_string(buffer, &mdev, &mdev_ch, &aim_name, NULL);
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if (ret)
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return ret;
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aim = match_module(aim_name);
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c = get_channel_by_name(mdev, mdev_ch);
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if (IS_ERR(c))
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return -ENODEV;
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@ -753,23 +786,27 @@ static ssize_t remove_link_store(struct device *dev,
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return len;
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}
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static DEVICE_ATTR_RO(links);
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static DEVICE_ATTR_WO(add_link);
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static DEVICE_ATTR_WO(remove_link);
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#define DRV_ATTR(_name) (&driver_attr_##_name.attr)
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static struct attribute *aim_attrs[] = {
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DEV_ATTR(links),
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DEV_ATTR(add_link),
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DEV_ATTR(remove_link),
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static DRIVER_ATTR_RO(links);
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static DRIVER_ATTR_RO(modules);
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static DRIVER_ATTR_WO(add_link);
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static DRIVER_ATTR_WO(remove_link);
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static struct attribute *module_attrs[] = {
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DRV_ATTR(links),
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DRV_ATTR(modules),
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DRV_ATTR(add_link),
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DRV_ATTR(remove_link),
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NULL,
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};
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static struct attribute_group aim_attr_group = {
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.attrs = aim_attrs,
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static struct attribute_group module_attr_group = {
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.attrs = module_attrs,
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};
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static const struct attribute_group *aim_attr_groups[] = {
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&aim_attr_group,
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static const struct attribute_group *module_attr_groups[] = {
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&module_attr_group,
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NULL,
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};
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@ -1287,7 +1324,6 @@ int most_register_aim(struct most_aim *aim)
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aim->dev.init_name = aim->name;
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aim->dev.bus = &mc.bus;
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aim->dev.parent = &mc.dev;
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aim->dev.groups = aim_attr_groups;
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aim->dev.release = release_aim;
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ret = device_register(&aim->dev);
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if (ret) {
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@ -1553,6 +1589,7 @@ static int __init most_init(void)
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mc.bus.match = most_match,
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mc.drv.name = "most_core",
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mc.drv.bus = &mc.bus,
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mc.drv.groups = module_attr_groups;
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err = bus_register(&mc.bus);
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if (err) {
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