3 files changed, 119 insertions, 1 deletions

diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index 8a3f51f7b1b9..db9d00c36a3e 100644
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -3,12 +3,15 @@
 # subsystems should select the appropriate symbols.
 
 config REGMAP
-        default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_MMIO || REGMAP_IRQ)
+        default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)
         select LZO_COMPRESS
         select LZO_DECOMPRESS
         select IRQ_DOMAIN if REGMAP_IRQ
         bool
 
+config REGMAP_AC97
+        tristate
+
 config REGMAP_I2C
         tristate
         depends on I2C
diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile
index a7c670b4123a..0a533653ef3b 100644
--- a/drivers/base/regmap/Makefile
+++ b/drivers/base/regmap/Makefile
@@ -1,6 +1,7 @@
 obj-$(CONFIG_REGMAP) += regmap.o regcache.o
 obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-lzo.o regcache-flat.o
 obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o
+obj-$(CONFIG_REGMAP_AC97) += regmap-ac97.o
 obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
 obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
 obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o
diff --git a/drivers/base/regmap/regmap-ac97.c b/drivers/base/regmap/regmap-ac97.c
new file mode 100644
index 000000000000..e4c45d2299c1
--- /dev/null
+++ b/drivers/base/regmap/regmap-ac97.c
@@ -0,0 +1,114 @@
+/*
+ * Register map access API - AC'97 support
+ *
+ * Copyright 2013 Linaro Ltd.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <sound/ac97_codec.h>
+
+bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case AC97_RESET:
+        case AC97_POWERDOWN:
+        case AC97_INT_PAGING:
+        case AC97_EXTENDED_ID:
+        case AC97_EXTENDED_STATUS:
+        case AC97_EXTENDED_MID:
+        case AC97_EXTENDED_MSTATUS:
+        case AC97_GPIO_STATUS:
+        case AC97_MISC_AFE:
+        case AC97_VENDOR_ID1:
+        case AC97_VENDOR_ID2:
+        case AC97_CODEC_CLASS_REV:
+        case AC97_PCI_SVID:
+        case AC97_PCI_SID:
+        case AC97_FUNC_SELECT:
+        case AC97_FUNC_INFO:
+        case AC97_SENSE_INFO:
+                return true;
+        default:
+                return false;
+        }
+}
+EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
+
+static int regmap_ac97_reg_read(void *context, unsigned int reg,
+        unsigned int *val)
+{
+        struct snd_ac97 *ac97 = context;
+
+        *val = ac97->bus->ops->read(ac97, reg);
+
+        return 0;
+}
+
+static int regmap_ac97_reg_write(void *context, unsigned int reg,
+        unsigned int val)
+{
+        struct snd_ac97 *ac97 = context;
+
+        ac97->bus->ops->write(ac97, reg, val);
+
+        return 0;
+}
+
+static const struct regmap_bus ac97_regmap_bus = {
+                .reg_write = regmap_ac97_reg_write,
+                .reg_read = regmap_ac97_reg_read,
+};
+
+/**
+ * regmap_init_ac97(): Initialise AC'97 register map
+ *
+ * @ac97: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer to
+ * a struct regmap.
+ */
+struct regmap *regmap_init_ac97(struct snd_ac97 *ac97,
+                                const struct regmap_config *config)
+{
+        return regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
+}
+EXPORT_SYMBOL_GPL(regmap_init_ac97);
+
+/**
+ * devm_regmap_init_ac97(): Initialise AC'97 register map
+ *
+ * @ac97: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap.  The regmap will be automatically freed by the
+ * device management code.
+ */
+struct regmap *devm_regmap_init_ac97(struct snd_ac97 *ac97,
+                                     const struct regmap_config *config)
+{
+        return devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
+}
+EXPORT_SYMBOL_GPL(devm_regmap_init_ac97);
+
+MODULE_LICENSE("GPL v2");