mfd: Add regmap cache support for wm8350

Use the most simple possible transformation on the existing code so keep
the table sitting around, further patches in this series will delete the
existing cache code - the main purpose of this patch is to ensure that
we always have a cache for bisection.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 74 insertions, 16 deletions

diff --git a/drivers/mfd/wm8350-core.c b/drivers/mfd/wm8350-core.c
index 8a9b11ca076a..fadcbbe9e2ba 100644
--- a/drivers/mfd/wm8350-core.c
+++ b/drivers/mfd/wm8350-core.c
@@ -32,9 +32,6 @@
 #include <linux/mfd/wm8350/supply.h>
 #include <linux/mfd/wm8350/wdt.h>
 
-#define WM8350_UNLOCK_KEY               0x0013
-#define WM8350_LOCK_KEY                 0x0000
-
 #define WM8350_CLOCK_CONTROL_1          0x28
 #define WM8350_AIF_TEST                 0x74
 
@@ -295,15 +292,20 @@ EXPORT_SYMBOL_GPL(wm8350_block_write);
  */
 int wm8350_reg_lock(struct wm8350 *wm8350)
 {
-        u16 key = WM8350_LOCK_KEY;
         int ret;
 
+        mutex_lock(&reg_lock_mutex);
+
         ldbg(__func__);
-        mutex_lock(&io_mutex);
-        ret = wm8350_write(wm8350, WM8350_SECURITY, 1, &key);
+
+        ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_LOCK_KEY);
         if (ret)
                 dev_err(wm8350->dev, "lock failed\n");
-        mutex_unlock(&io_mutex);
+
+        wm8350->unlocked = false;
+
+        mutex_unlock(&reg_lock_mutex);
+
         return ret;
 }
 EXPORT_SYMBOL_GPL(wm8350_reg_lock);
@@ -319,15 +321,20 @@ EXPORT_SYMBOL_GPL(wm8350_reg_lock);
  */
 int wm8350_reg_unlock(struct wm8350 *wm8350)
 {
-        u16 key = WM8350_UNLOCK_KEY;
         int ret;
 
+        mutex_lock(&reg_lock_mutex);
+
         ldbg(__func__);
-        mutex_lock(&io_mutex);
-        ret = wm8350_write(wm8350, WM8350_SECURITY, 1, &key);
+
+        ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_UNLOCK_KEY);
         if (ret)
                 dev_err(wm8350->dev, "unlock failed\n");
-        mutex_unlock(&io_mutex);
+
+        wm8350->unlocked = true;
+
+        mutex_unlock(&reg_lock_mutex);
+
         return ret;
 }
 EXPORT_SYMBOL_GPL(wm8350_reg_unlock);
diff --git a/drivers/mfd/wm8350-i2c.c b/drivers/mfd/wm8350-i2c.c
index a68aceb4e48c..2e57101c8d3d 100644
--- a/drivers/mfd/wm8350-i2c.c
+++ b/drivers/mfd/wm8350-i2c.c
@@ -23,11 +23,6 @@
 #include <linux/regmap.h>
 #include <linux/slab.h>
 
-static const struct regmap_config wm8350_regmap = {
-        .reg_bits = 8,
-        .val_bits = 16,
-};
-
 static int wm8350_i2c_probe(struct i2c_client *i2c,
                             const struct i2c_device_id *id)
 {
diff --git a/drivers/mfd/wm8350-regmap.c b/drivers/mfd/wm8350-regmap.c
index e965139e5cd5..7974cadaa422 100644
--- a/drivers/mfd/wm8350-regmap.c
+++ b/drivers/mfd/wm8350-regmap.c
@@ -3433,3 +3433,59 @@ const struct wm8350_reg_access wm8350_reg_io_map[] = {
         { 0x0000, 0x0000, 0x0000 }, /* R254 */
         { 0x0000, 0x0000, 0x0000 }, /* R255 */
 };
+
+static bool wm8350_readable(struct device *dev, unsigned int reg)
+{
+        return wm8350_reg_io_map[reg].readable;
+}
+
+static bool wm8350_writeable(struct device *dev, unsigned int reg)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(dev);
+
+        if (!wm8350->unlocked) {
+                if ((reg >= WM8350_GPIO_FUNCTION_SELECT_1 &&
+                     reg <= WM8350_GPIO_FUNCTION_SELECT_4) ||
+                    (reg >= WM8350_BATTERY_CHARGER_CONTROL_1 &&
+                     reg <= WM8350_BATTERY_CHARGER_CONTROL_3))
+                        return false;
+        }
+
+        return wm8350_reg_io_map[reg].writable;
+}
+
+static bool wm8350_volatile(struct device *dev, unsigned int reg)
+{
+        return wm8350_reg_io_map[reg].vol;
+}
+
+static bool wm8350_precious(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case WM8350_SYSTEM_INTERRUPTS:
+        case WM8350_INT_STATUS_1:
+        case WM8350_INT_STATUS_2:
+        case WM8350_POWER_UP_INT_STATUS:
+        case WM8350_UNDER_VOLTAGE_INT_STATUS:
+        case WM8350_OVER_CURRENT_INT_STATUS:
+        case WM8350_GPIO_INT_STATUS:
+        case WM8350_COMPARATOR_INT_STATUS:
+                return true;
+
+        default:
+                return false;
+        }
+}
+
+const struct regmap_config wm8350_regmap = {
+        .reg_bits = 8,
+        .val_bits = 16,
+
+        .cache_type = REGCACHE_RBTREE,
+
+        .max_register = WM8350_MAX_REGISTER,
+        .readable_reg = wm8350_readable,
+        .writeable_reg = wm8350_writeable,
+        .volatile_reg = wm8350_volatile,
+        .precious_reg = wm8350_precious,
+};