libertas: sysfs interface for accessing non-volatile configuration

This will create the following sysfs directories:
/sys/class/net/mshX
		...
		|-- boot_options
		|   |-- bootflag
		|   `-- boottime
		...
		|-- mesh_ie
		|   |-- capability
		|   |-- mesh_id
		|   |-- metric_id
		|   `-- protocol_id

Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 423 insertions, 9 deletions

diff --git a/drivers/net/wireless/libertas/Makefile b/drivers/net/wireless/libertas/Makefile
index f0724e31adfd..02080a3682a9 100644
--- a/drivers/net/wireless/libertas/Makefile
+++ b/drivers/net/wireless/libertas/Makefile
@@ -1,9 +1,5 @@
-libertas-objs := main.o wext.o \
-                rx.o tx.o cmd.o           \
-                cmdresp.o scan.o          \
-                11d.o             \
-                debugfs.o         \
-                ethtool.o assoc.o
+libertas-objs := main.o wext.o rx.o tx.o cmd.o cmdresp.o scan.o 11d.o   \
+                 debugfs.o persistcfg.o ethtool.o assoc.o
 
 usb8xxx-objs += if_usb.o
 libertas_cs-objs += if_cs.o
diff --git a/drivers/net/wireless/libertas/decl.h b/drivers/net/wireless/libertas/decl.h
index 0632b09655d2..a8ac974dacac 100644
--- a/drivers/net/wireless/libertas/decl.h
+++ b/drivers/net/wireless/libertas/decl.h
@@ -60,6 +60,10 @@ void lbs_mac_event_disconnected(struct lbs_private *priv);
 
 void lbs_send_iwevcustom_event(struct lbs_private *priv, s8 *str);
 
+/* persistcfg.c */
+void lbs_persist_config_init(struct net_device *net);
+void lbs_persist_config_remove(struct net_device *net);
+
 /* main.c */
 struct chan_freq_power *lbs_get_region_cfp_table(u8 region,
         int *cfp_no);
diff --git a/drivers/net/wireless/libertas/defs.h b/drivers/net/wireless/libertas/defs.h
index 3793cb92296a..12e687550bce 100644
--- a/drivers/net/wireless/libertas/defs.h
+++ b/drivers/net/wireless/libertas/defs.h
@@ -40,6 +40,7 @@
 #define LBS_DEB_THREAD  0x00100000
 #define LBS_DEB_HEX     0x00200000
 #define LBS_DEB_SDIO    0x00400000
+#define LBS_DEB_SYSFS   0x00800000
 
 extern unsigned int lbs_debug;
 
@@ -81,7 +82,8 @@ do { if ((lbs_debug & (grp)) == (grp)) \
 #define lbs_deb_usbd(dev, fmt, args...) LBS_DEB_LL(LBS_DEB_USB, " usbd", "%s:" fmt, (dev)->bus_id, ##args)
 #define lbs_deb_cs(fmt, args...)        LBS_DEB_LL(LBS_DEB_CS, " cs", fmt, ##args)
 #define lbs_deb_thread(fmt, args...)    LBS_DEB_LL(LBS_DEB_THREAD, " thread", fmt, ##args)
-#define lbs_deb_sdio(fmt, args...)      LBS_DEB_LL(LBS_DEB_SDIO, " thread", fmt, ##args)
+#define lbs_deb_sdio(fmt, args...)      LBS_DEB_LL(LBS_DEB_SDIO, " sdio", fmt, ##args)
+#define lbs_deb_sysfs(fmt, args...)     LBS_DEB_LL(LBS_DEB_SYSFS, " sysfs", fmt, ##args)
 
 #define lbs_pr_info(format, args...) \
         printk(KERN_INFO DRV_NAME": " format, ## args)
diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 01299c8ed27c..db246d0a1eda 100644
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -1302,8 +1302,9 @@ void lbs_stop_card(struct lbs_private *priv)
 
         lbs_debugfs_remove_one(priv);
         device_remove_file(&dev->dev, &dev_attr_lbs_rtap);
-        if (priv->mesh_tlv)
+        if (priv->mesh_tlv) {
                 device_remove_file(&dev->dev, &dev_attr_lbs_mesh);
+        }
 
         /* Flush pending command nodes */
         del_timer_sync(&priv->command_timer);
@@ -1372,6 +1373,8 @@ static int lbs_add_mesh(struct lbs_private *priv)
         if (ret)
                 goto err_unregister;
 
+        lbs_persist_config_init(mesh_dev);
+
         /* Everything successful */
         ret = 0;
         goto done;
@@ -1398,8 +1401,9 @@ static void lbs_remove_mesh(struct lbs_private *priv)
 
         lbs_deb_enter(LBS_DEB_MESH);
         netif_stop_queue(mesh_dev);
-        netif_carrier_off(priv->mesh_dev);
+        netif_carrier_off(mesh_dev);
         sysfs_remove_group(&(mesh_dev->dev.kobj), &lbs_mesh_attr_group);
+        lbs_persist_config_remove(mesh_dev);
         unregister_netdev(mesh_dev);
         priv->mesh_dev = NULL;
         free_netdev(mesh_dev);
diff --git a/drivers/net/wireless/libertas/persistcfg.c b/drivers/net/wireless/libertas/persistcfg.c
new file mode 100644
index 000000000000..baa662738895
--- /dev/null
+++ b/drivers/net/wireless/libertas/persistcfg.c
@@ -0,0 +1,408 @@
+#include <linux/moduleparam.h>
+#include <linux/delay.h>
+#include <linux/etherdevice.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/kthread.h>
+#include <linux/kfifo.h>
+
+#include "host.h"
+#include "decl.h"
+#include "dev.h"
+#include "wext.h"
+#include "debugfs.h"
+#include "scan.h"
+#include "assoc.h"
+#include "cmd.h"
+
+static int mesh_get_default_parameters(struct device *dev,
+                                       struct mrvl_mesh_defaults *defs)
+{
+        struct lbs_private *priv = to_net_dev(dev)->priv;
+        struct cmd_ds_mesh_config cmd;
+        int ret;
+
+        memset(&cmd, 0, sizeof(struct cmd_ds_mesh_config));
+        ret = lbs_mesh_config_send(priv, &cmd, CMD_ACT_MESH_CONFIG_GET,
+                                   CMD_TYPE_MESH_GET_DEFAULTS);
+
+        if (ret)
+                return -EOPNOTSUPP;
+
+        memcpy(defs, &cmd.data[0], sizeof(struct mrvl_mesh_defaults));
+
+        return 0;
+}
+
+/**
+ * @brief Get function for sysfs attribute bootflag
+ */
+static ssize_t bootflag_get(struct device *dev,
+                            struct device_attribute *attr, char *buf)
+{
+        struct mrvl_mesh_defaults defs;
+        int ret;
+
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        if (ret)
+                return ret;
+
+        return snprintf(buf, 12, "0x%x\n", le32_to_cpu(defs.bootflag));
+}
+
+/**
+ * @brief Set function for sysfs attribute bootflag
+ */
+static ssize_t bootflag_set(struct device *dev, struct device_attribute *attr,
+                            const char *buf, size_t count)
+{
+        struct lbs_private *priv = to_net_dev(dev)->priv;
+        struct cmd_ds_mesh_config cmd;
+        uint32_t datum;
+        int ret;
+
+        memset(&cmd, 0, sizeof(cmd));
+        ret = sscanf(buf, "%x", &datum);
+        if (ret != 1)
+                return -EINVAL;
+
+        *((__le32 *)&cmd.data[0]) = cpu_to_le32(!!datum);
+        cmd.length = cpu_to_le16(sizeof(uint32_t));
+        ret = lbs_mesh_config_send(priv, &cmd, CMD_ACT_MESH_CONFIG_SET,
+                                   CMD_TYPE_MESH_SET_BOOTFLAG);
+        if (ret)
+                return ret;
+
+        return strlen(buf);
+}
+
+/**
+ * @brief Get function for sysfs attribute boottime
+ */
+static ssize_t boottime_get(struct device *dev,
+                            struct device_attribute *attr, char *buf)
+{
+        struct mrvl_mesh_defaults defs;
+        int ret;
+
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        if (ret)
+                return ret;
+
+        return snprintf(buf, 12, "0x%x\n", defs.boottime);
+}
+
+/**
+ * @brief Set function for sysfs attribute boottime
+ */
+static ssize_t boottime_set(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct lbs_private *priv = to_net_dev(dev)->priv;
+        struct cmd_ds_mesh_config cmd;
+        uint32_t datum;
+        int ret;
+
+        memset(&cmd, 0, sizeof(cmd));
+        ret = sscanf(buf, "%x", &datum);
+        if (ret != 1)
+                return -EINVAL;
+
+        /* A too small boot time will result in the device booting into
+         * standalone (no-host) mode before the host can take control of it,
+         * so the change will be hard to revert.  This may be a desired
+         * feature (e.g to configure a very fast boot time for devices that
+         * will not be attached to a host), but dangerous.  So I'm enforcing a
+         * lower limit of 20 seconds:  remove and recompile the driver if this
+         * does not work for you.
+         */
+        datum = (datum < 20) ? 20 : datum;
+        cmd.data[0] = datum;
+        cmd.length = cpu_to_le16(sizeof(uint8_t));
+        ret = lbs_mesh_config_send(priv, &cmd, CMD_ACT_MESH_CONFIG_SET,
+                                   CMD_TYPE_MESH_SET_BOOTTIME);
+        if (ret)
+                return ret;
+
+        return strlen(buf);
+}
+
+/**
+ * @brief Get function for sysfs attribute mesh_id
+ */
+static ssize_t mesh_id_get(struct device *dev, struct device_attribute *attr,
+                           char *buf)
+{
+        struct mrvl_mesh_defaults defs;
+        int maxlen;
+        int ret;
+
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        if (ret)
+                return ret;
+
+        if (defs.meshie.val.mesh_id_len > IW_ESSID_MAX_SIZE) {
+                printk(KERN_ERR "Inconsistent mesh ID length");
+                defs.meshie.val.mesh_id_len = IW_ESSID_MAX_SIZE;
+        }
+
+        /* SSID not null terminated: reserve room for \0 + \n */
+        maxlen = defs.meshie.val.mesh_id_len + 2;
+        maxlen = (PAGE_SIZE > maxlen) ? maxlen : PAGE_SIZE;
+
+        defs.meshie.val.mesh_id[defs.meshie.val.mesh_id_len] = '\0';
+
+        return snprintf(buf, maxlen, "%s\n", defs.meshie.val.mesh_id);
+}
+
+/**
+ * @brief Set function for sysfs attribute mesh_id
+ */
+static ssize_t mesh_id_set(struct device *dev, struct device_attribute *attr,
+                           const char *buf, size_t count)
+{
+        struct cmd_ds_mesh_config cmd;
+        struct mrvl_mesh_defaults defs;
+        struct mrvl_meshie *ie;
+        struct lbs_private *priv = to_net_dev(dev)->priv;
+        int len;
+        int ret;
+
+        if (count < 2 || count > IW_ESSID_MAX_SIZE + 1)
+                return -EINVAL;
+
+        memset(&cmd, 0, sizeof(struct cmd_ds_mesh_config));
+        ie = (struct mrvl_meshie *) &cmd.data[0];
+
+        /* fetch all other Information Element parameters */
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        cmd.length = cpu_to_le16(sizeof(struct mrvl_meshie));
+
+        /* transfer IE elements */
+        memcpy(ie, &defs.meshie, sizeof(struct mrvl_meshie));
+
+        len = count - 1;
+        memcpy(ie->val.mesh_id, buf, len);
+        /* SSID len */
+        ie->val.mesh_id_len = len;
+        /* IE len */
+        ie->hdr.len = sizeof(struct mrvl_meshie_val) - IW_ESSID_MAX_SIZE + len;
+
+        ret = lbs_mesh_config_send(priv, &cmd, CMD_ACT_MESH_CONFIG_SET,
+                                   CMD_TYPE_MESH_SET_MESH_IE);
+        if (ret)
+                return ret;
+
+        return strlen(buf);
+}
+
+/**
+ * @brief Get function for sysfs attribute protocol_id
+ */
+static ssize_t protocol_id_get(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+        struct mrvl_mesh_defaults defs;
+        int ret;
+
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        if (ret)
+                return ret;
+
+        return snprintf(buf, 5, "%d\n", defs.meshie.val.active_protocol_id);
+}
+
+/**
+ * @brief Set function for sysfs attribute protocol_id
+ */
+static ssize_t protocol_id_set(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct cmd_ds_mesh_config cmd;
+        struct mrvl_mesh_defaults defs;
+        struct mrvl_meshie *ie;
+        struct lbs_private *priv = to_net_dev(dev)->priv;
+        uint32_t datum;
+        int ret;
+
+        memset(&cmd, 0, sizeof(cmd));
+        ret = sscanf(buf, "%x", &datum);
+        if (ret != 1)
+                return -EINVAL;
+
+        /* fetch all other Information Element parameters */
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        cmd.length = cpu_to_le16(sizeof(struct mrvl_meshie));
+
+        /* transfer IE elements */
+        ie = (struct mrvl_meshie *) &cmd.data[0];
+        memcpy(ie, &defs.meshie, sizeof(struct mrvl_meshie));
+        /* update protocol id */
+        ie->val.active_protocol_id = datum;
+
+        ret = lbs_mesh_config_send(priv, &cmd, CMD_ACT_MESH_CONFIG_SET,
+                                   CMD_TYPE_MESH_SET_MESH_IE);
+        if (ret)
+                return ret;
+
+        return strlen(buf);
+}
+
+/**
+ * @brief Get function for sysfs attribute metric_id
+ */
+static ssize_t metric_id_get(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct mrvl_mesh_defaults defs;
+        int ret;
+
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        if (ret)
+                return ret;
+
+        return snprintf(buf, 5, "%d\n", defs.meshie.val.active_metric_id);
+}
+
+/**
+ * @brief Set function for sysfs attribute metric_id
+ */
+static ssize_t metric_id_set(struct device *dev, struct device_attribute *attr,
+                             const char *buf, size_t count)
+{
+        struct cmd_ds_mesh_config cmd;
+        struct mrvl_mesh_defaults defs;
+        struct mrvl_meshie *ie;
+        struct lbs_private *priv = to_net_dev(dev)->priv;
+        uint32_t datum;
+        int ret;
+
+        memset(&cmd, 0, sizeof(cmd));
+        ret = sscanf(buf, "%x", &datum);
+        if (ret != 1)
+                return -EINVAL;
+
+        /* fetch all other Information Element parameters */
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        cmd.length = cpu_to_le16(sizeof(struct mrvl_meshie));
+
+        /* transfer IE elements */
+        ie = (struct mrvl_meshie *) &cmd.data[0];
+        memcpy(ie, &defs.meshie, sizeof(struct mrvl_meshie));
+        /* update metric id */
+        ie->val.active_metric_id = datum;
+
+        ret = lbs_mesh_config_send(priv, &cmd, CMD_ACT_MESH_CONFIG_SET,
+                                   CMD_TYPE_MESH_SET_MESH_IE);
+        if (ret)
+                return ret;
+
+        return strlen(buf);
+}
+
+/**
+ * @brief Get function for sysfs attribute capability
+ */
+static ssize_t capability_get(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct mrvl_mesh_defaults defs;
+        int ret;
+
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        if (ret)
+                return ret;
+
+        return snprintf(buf, 5, "%d\n", defs.meshie.val.mesh_capability);
+}
+
+/**
+ * @brief Set function for sysfs attribute capability
+ */
+static ssize_t capability_set(struct device *dev, struct device_attribute *attr,
+                              const char *buf, size_t count)
+{
+        struct cmd_ds_mesh_config cmd;
+        struct mrvl_mesh_defaults defs;
+        struct mrvl_meshie *ie;
+        struct lbs_private *priv = to_net_dev(dev)->priv;
+        uint32_t datum;
+        int ret;
+
+        memset(&cmd, 0, sizeof(cmd));
+        ret = sscanf(buf, "%x", &datum);
+        if (ret != 1)
+                return -EINVAL;
+
+        /* fetch all other Information Element parameters */
+        ret = mesh_get_default_parameters(dev, &defs);
+
+        cmd.length = cpu_to_le16(sizeof(struct mrvl_meshie));
+
+        /* transfer IE elements */
+        ie = (struct mrvl_meshie *) &cmd.data[0];
+        memcpy(ie, &defs.meshie, sizeof(struct mrvl_meshie));
+        /* update value */
+        ie->val.mesh_capability = datum;
+
+        ret = lbs_mesh_config_send(priv, &cmd, CMD_ACT_MESH_CONFIG_SET,
+                                   CMD_TYPE_MESH_SET_MESH_IE);
+        if (ret)
+                return ret;
+
+        return strlen(buf);
+}
+
+
+static DEVICE_ATTR(bootflag, 0644, bootflag_get, bootflag_set);
+static DEVICE_ATTR(boottime, 0644, boottime_get, boottime_set);
+static DEVICE_ATTR(mesh_id, 0644, mesh_id_get, mesh_id_set);
+static DEVICE_ATTR(protocol_id, 0644, protocol_id_get, protocol_id_set);
+static DEVICE_ATTR(metric_id, 0644, metric_id_get, metric_id_set);
+static DEVICE_ATTR(capability, 0644, capability_get, capability_set);
+
+static struct attribute *boot_opts_attrs[] = {
+        &dev_attr_bootflag.attr,
+        &dev_attr_boottime.attr,
+        NULL
+};
+
+static struct attribute_group boot_opts_group = {
+        .name = "boot_options",
+        .attrs = boot_opts_attrs,
+};
+
+static struct attribute *mesh_ie_attrs[] = {
+        &dev_attr_mesh_id.attr,
+        &dev_attr_protocol_id.attr,
+        &dev_attr_metric_id.attr,
+        &dev_attr_capability.attr,
+        NULL
+};
+
+static struct attribute_group mesh_ie_group = {
+        .name = "mesh_ie",
+        .attrs = mesh_ie_attrs,
+};
+
+void lbs_persist_config_init(struct net_device *dev)
+{
+        int ret;
+        ret = sysfs_create_group(&(dev->dev.kobj), &boot_opts_group);
+        ret = sysfs_create_group(&(dev->dev.kobj), &mesh_ie_group);
+}
+
+void lbs_persist_config_remove(struct net_device *dev)
+{
+        sysfs_remove_group(&(dev->dev.kobj), &boot_opts_group);
+        sysfs_remove_group(&(dev->dev.kobj), &mesh_ie_group);
+}