--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2018 MediaTek Inc.
+ * Author: Sirui Zhao <Sirui.Zhao@mediatek.com>
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <net/genetlink.h>
+
+#include "mt753x.h"
+#include "mt753x_nl.h"
+
+struct mt753x_nl_cmd_item {
+ enum mt753x_cmd cmd;
+ bool require_dev;
+ int (*process)(struct genl_info *info, struct gsw_mt753x *gsw);
+ u32 nr_required_attrs;
+ const enum mt753x_attr *required_attrs;
+};
+
+static int mt753x_nl_response(struct sk_buff *skb, struct genl_info *info);
+
+/*
+static const struct nla_policy mt753x_nl_cmd_policy[] = {
+ [MT753X_ATTR_TYPE_MESG] = { .type = NLA_STRING },
+ [MT753X_ATTR_TYPE_PHY] = { .type = NLA_S32 },
+ [MT753X_ATTR_TYPE_REG] = { .type = NLA_S32 },
+ [MT753X_ATTR_TYPE_VAL] = { .type = NLA_S32 },
+ [MT753X_ATTR_TYPE_DEV_NAME] = { .type = NLA_S32 },
+ [MT753X_ATTR_TYPE_DEV_ID] = { .type = NLA_S32 },
+ [MT753X_ATTR_TYPE_DEVAD] = { .type = NLA_S32 },
+};
+*/
+
+static const struct genl_ops mt753x_nl_ops[] = {
+ {
+ .cmd = MT753X_CMD_REQUEST,
+ .doit = mt753x_nl_response,
+// .policy = mt753x_nl_cmd_policy,
+ .flags = GENL_ADMIN_PERM,
+ }, {
+ .cmd = MT753X_CMD_READ,
+ .doit = mt753x_nl_response,
+// .policy = mt753x_nl_cmd_policy,
+ .flags = GENL_ADMIN_PERM,
+ }, {
+ .cmd = MT753X_CMD_WRITE,
+ .doit = mt753x_nl_response,
+// .policy = mt753x_nl_cmd_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+};
+
+static struct genl_family mt753x_nl_family = {
+ .name = MT753X_GENL_NAME,
+ .version = MT753X_GENL_VERSION,
+ .maxattr = MT753X_NR_ATTR_TYPE,
+ .ops = mt753x_nl_ops,
+ .n_ops = ARRAY_SIZE(mt753x_nl_ops),
+};
+
+static int mt753x_nl_list_devs(char *buff, int size)
+{
+ struct gsw_mt753x *gsw;
+ int len, total = 0;
+ char buf[80];
+
+ memset(buff, 0, size);
+
+ mt753x_lock_gsw();
+
+ list_for_each_entry(gsw, &mt753x_devs, list) {
+ len = snprintf(buf, sizeof(buf),
+ "id: %d, model: %s, node: %s\n",
+ gsw->id, gsw->name, gsw->dev->of_node->name);
+ strncat(buff, buf, size - total);
+ total += len;
+ }
+
+ mt753x_put_gsw();
+
+ return total;
+}
+
+static int mt753x_nl_prepare_reply(struct genl_info *info, u8 cmd,
+ struct sk_buff **skbp)
+{
+ struct sk_buff *msg;
+ void *reply;
+
+ if (!info)
+ return -EINVAL;
+
+ msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ /* Construct send-back message header */
+ reply = genlmsg_put(msg, info->snd_portid, info->snd_seq,
+ &mt753x_nl_family, 0, cmd);
+ if (!reply) {
+ nlmsg_free(msg);
+ return -EINVAL;
+ }
+
+ *skbp = msg;
+ return 0;
+}
+
+static int mt753x_nl_send_reply(struct sk_buff *skb, struct genl_info *info)
+{
+ struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
+ void *reply = genlmsg_data(genlhdr);
+
+ /* Finalize a generic netlink message (update message header) */
+ genlmsg_end(skb, reply);
+
+ /* reply to a request */
+ return genlmsg_reply(skb, info);
+}
+
+static s32 mt753x_nl_get_s32(struct genl_info *info, enum mt753x_attr attr,
+ s32 defval)
+{
+ struct nlattr *na;
+
+ na = info->attrs[attr];
+ if (na)
+ return nla_get_s32(na);
+
+ return defval;
+}
+
+static int mt753x_nl_get_u32(struct genl_info *info, enum mt753x_attr attr,
+ u32 *val)
+{
+ struct nlattr *na;
+
+ na = info->attrs[attr];
+ if (na) {
+ *val = nla_get_u32(na);
+ return 0;
+ }
+
+ return -1;
+}
+
+static struct gsw_mt753x *mt753x_nl_parse_find_gsw(struct genl_info *info)
+{
+ struct gsw_mt753x *gsw;
+ struct nlattr *na;
+ int gsw_id;
+
+ na = info->attrs[MT753X_ATTR_TYPE_DEV_ID];
+ if (na) {
+ gsw_id = nla_get_s32(na);
+ if (gsw_id >= 0)
+ gsw = mt753x_get_gsw(gsw_id);
+ else
+ gsw = mt753x_get_first_gsw();
+ } else {
+ gsw = mt753x_get_first_gsw();
+ }
+
+ return gsw;
+}
+
+static int mt753x_nl_get_swdevs(struct genl_info *info, struct gsw_mt753x *gsw)
+{
+ struct sk_buff *rep_skb = NULL;
+ char dev_info[512];
+ int ret;
+
+ ret = mt753x_nl_list_devs(dev_info, sizeof(dev_info));
+ if (!ret) {
+ pr_info("No switch registered\n");
+ return -EINVAL;
+ }
+
+ ret = mt753x_nl_prepare_reply(info, MT753X_CMD_REPLY, &rep_skb);
+ if (ret < 0)
+ goto err;
+
+ ret = nla_put_string(rep_skb, MT753X_ATTR_TYPE_MESG, dev_info);
+ if (ret < 0)
+ goto err;
+
+ return mt753x_nl_send_reply(rep_skb, info);
+
+err:
+ if (rep_skb)
+ nlmsg_free(rep_skb);
+
+ return ret;
+}
+
+static int mt753x_nl_reply_read(struct genl_info *info, struct gsw_mt753x *gsw)
+{
+ struct sk_buff *rep_skb = NULL;
+ s32 phy, devad, reg;
+ int value;
+ int ret = 0;
+
+ phy = mt753x_nl_get_s32(info, MT753X_ATTR_TYPE_PHY, -1);
+ devad = mt753x_nl_get_s32(info, MT753X_ATTR_TYPE_DEVAD, -1);
+ reg = mt753x_nl_get_s32(info, MT753X_ATTR_TYPE_REG, -1);
+
+ if (reg < 0)
+ goto err;
+
+ ret = mt753x_nl_prepare_reply(info, MT753X_CMD_READ, &rep_skb);
+ if (ret < 0)
+ goto err;
+
+ if (phy >= 0) {
+ if (devad < 0)
+ value = gsw->mii_read(gsw, phy, reg);
+ else
+ value = gsw->mmd_read(gsw, phy, devad, reg);
+ } else {
+ value = mt753x_reg_read(gsw, reg);
+ }
+
+ ret = nla_put_s32(rep_skb, MT753X_ATTR_TYPE_REG, reg);
+ if (ret < 0)
+ goto err;
+
+ ret = nla_put_s32(rep_skb, MT753X_ATTR_TYPE_VAL, value);
+ if (ret < 0)
+ goto err;
+
+ return mt753x_nl_send_reply(rep_skb, info);
+
+err:
+ if (rep_skb)
+ nlmsg_free(rep_skb);
+
+ return ret;
+}
+
+static int mt753x_nl_reply_write(struct genl_info *info, struct gsw_mt753x *gsw)
+{
+ struct sk_buff *rep_skb = NULL;
+ s32 phy, devad, reg;
+ u32 value;
+ int ret = 0;
+
+ phy = mt753x_nl_get_s32(info, MT753X_ATTR_TYPE_PHY, -1);
+ devad = mt753x_nl_get_s32(info, MT753X_ATTR_TYPE_DEVAD, -1);
+ reg = mt753x_nl_get_s32(info, MT753X_ATTR_TYPE_REG, -1);
+
+ if (mt753x_nl_get_u32(info, MT753X_ATTR_TYPE_VAL, &value))
+ goto err;
+
+ if (reg < 0)
+ goto err;
+
+ ret = mt753x_nl_prepare_reply(info, MT753X_CMD_WRITE, &rep_skb);
+ if (ret < 0)
+ goto err;
+
+ if (phy >= 0) {
+ if (devad < 0)
+ gsw->mii_write(gsw, phy, reg, value);
+ else
+ gsw->mmd_write(gsw, phy, devad, reg, value);
+ } else {
+ mt753x_reg_write(gsw, reg, value);
+ }
+
+ ret = nla_put_s32(rep_skb, MT753X_ATTR_TYPE_REG, reg);
+ if (ret < 0)
+ goto err;
+
+ ret = nla_put_s32(rep_skb, MT753X_ATTR_TYPE_VAL, value);
+ if (ret < 0)
+ goto err;
+
+ return mt753x_nl_send_reply(rep_skb, info);
+
+err:
+ if (rep_skb)
+ nlmsg_free(rep_skb);
+
+ return ret;
+}
+
+static const enum mt753x_attr mt753x_nl_cmd_read_attrs[] = {
+ MT753X_ATTR_TYPE_REG
+};
+
+static const enum mt753x_attr mt753x_nl_cmd_write_attrs[] = {
+ MT753X_ATTR_TYPE_REG,
+ MT753X_ATTR_TYPE_VAL
+};
+
+static const struct mt753x_nl_cmd_item mt753x_nl_cmds[] = {
+ {
+ .cmd = MT753X_CMD_REQUEST,
+ .require_dev = false,
+ .process = mt753x_nl_get_swdevs
+ }, {
+ .cmd = MT753X_CMD_READ,
+ .require_dev = true,
+ .process = mt753x_nl_reply_read,
+ .required_attrs = mt753x_nl_cmd_read_attrs,
+ .nr_required_attrs = ARRAY_SIZE(mt753x_nl_cmd_read_attrs),
+ }, {
+ .cmd = MT753X_CMD_WRITE,
+ .require_dev = true,
+ .process = mt753x_nl_reply_write,
+ .required_attrs = mt753x_nl_cmd_write_attrs,
+ .nr_required_attrs = ARRAY_SIZE(mt753x_nl_cmd_write_attrs),
+ }
+};
+
+static int mt753x_nl_response(struct sk_buff *skb, struct genl_info *info)
+{
+ struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
+ const struct mt753x_nl_cmd_item *cmditem = NULL;
+ struct gsw_mt753x *gsw = NULL;
+ u32 sat_req_attrs = 0;
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(mt753x_nl_cmds); i++) {
+ if (hdr->cmd == mt753x_nl_cmds[i].cmd) {
+ cmditem = &mt753x_nl_cmds[i];
+ break;
+ }
+ }
+
+ if (!cmditem) {
+ pr_info("mt753x-nl: unknown cmd %u\n", hdr->cmd);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < cmditem->nr_required_attrs; i++) {
+ if (info->attrs[cmditem->required_attrs[i]])
+ sat_req_attrs++;
+ }
+
+ if (sat_req_attrs != cmditem->nr_required_attrs) {
+ pr_info("mt753x-nl: missing required attr(s) for cmd %u\n",
+ hdr->cmd);
+ return -EINVAL;
+ }
+
+ if (cmditem->require_dev) {
+ gsw = mt753x_nl_parse_find_gsw(info);
+ if (!gsw) {
+ pr_info("mt753x-nl: failed to find switch dev\n");
+ return -EINVAL;
+ }
+ }
+
+ ret = cmditem->process(info, gsw);
+
+ mt753x_put_gsw();
+
+ return ret;
+}
+
+int __init mt753x_nl_init(void)
+{
+ int ret;
+
+ ret = genl_register_family(&mt753x_nl_family);
+ if (ret) {
+ pr_info("mt753x-nl: genl_register_family_with_ops failed\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+void __exit mt753x_nl_exit(void)
+{
+ genl_unregister_family(&mt753x_nl_family);
+}
projects / openwrt / openwrt.git / blobdiff