ath9k: add debugfs files for reading/writing registers

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 90 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 7a2fe09d4a9..2ca9bba8a6a 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -794,6 +794,86 @@ static const struct file_operations fops_recv = {
         .owner = THIS_MODULE
 };
 
+static ssize_t read_file_regidx(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        char buf[32];
+        unsigned int len;
+
+        len = snprintf(buf, sizeof(buf), "0x%08x\n", sc->debug.regidx);
+        return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t write_file_regidx(struct file *file, const char __user *user_buf,
+                             size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        unsigned long regidx;
+        char buf[32];
+        ssize_t len;
+
+        len = min(count, sizeof(buf) - 1);
+        if (copy_from_user(buf, user_buf, len))
+                return -EINVAL;
+
+        buf[len] = '\0';
+        if (strict_strtoul(buf, 0, &regidx))
+                return -EINVAL;
+
+        sc->debug.regidx = regidx;
+        return count;
+}
+
+static const struct file_operations fops_regidx = {
+        .read = read_file_regidx,
+        .write = write_file_regidx,
+        .open = ath9k_debugfs_open,
+        .owner = THIS_MODULE
+};
+
+static ssize_t read_file_regval(struct file *file, char __user *user_buf,
+                             size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        struct ath_hw *ah = sc->sc_ah;
+        char buf[32];
+        unsigned int len;
+        u32 regval;
+
+        regval = REG_READ_D(ah, sc->debug.regidx);
+        len = snprintf(buf, sizeof(buf), "0x%08x\n", regval);
+        return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t write_file_regval(struct file *file, const char __user *user_buf,
+                             size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        struct ath_hw *ah = sc->sc_ah;
+        unsigned long regval;
+        char buf[32];
+        ssize_t len;
+
+        len = min(count, sizeof(buf) - 1);
+        if (copy_from_user(buf, user_buf, len))
+                return -EINVAL;
+
+        buf[len] = '\0';
+        if (strict_strtoul(buf, 0, &regval))
+                return -EINVAL;
+
+        REG_WRITE_D(ah, sc->debug.regidx, regval);
+        return count;
+}
+
+static const struct file_operations fops_regval = {
+        .read = read_file_regval,
+        .write = write_file_regval,
+        .open = ath9k_debugfs_open,
+        .owner = THIS_MODULE
+};
+
 int ath9k_init_debug(struct ath_hw *ah)
 {
         struct ath_common *common = ath9k_hw_common(ah);
@@ -845,6 +925,15 @@ int ath9k_init_debug(struct ath_hw *ah)
                         sc->debug.debugfs_phy, sc, &fops_tx_chainmask))
                 goto err;
 
+        if (!debugfs_create_file("regidx", S_IRUSR | S_IWUSR,
+                        sc->debug.debugfs_phy, sc, &fops_regidx))
+                goto err;
+
+        if (!debugfs_create_file("regval", S_IRUSR | S_IWUSR,
+                        sc->debug.debugfs_phy, sc, &fops_regval))
+                goto err;
+
+        sc->debug.regidx = 0;
         return 0;
 err:
         ath9k_exit_debug(ah);
diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
index 731436035ba..5147b8709e1 100644
--- a/drivers/net/wireless/ath/ath9k/debug.h
+++ b/drivers/net/wireless/ath/ath9k/debug.h
@@ -153,6 +153,7 @@ struct ath_stats {
 
 struct ath9k_debug {
         struct dentry *debugfs_phy;
+        u32 regidx;
         struct ath_stats stats;
 };