ASoC: rcar: add rsnd_is_accessible_reg()

Current rcar driver is supporting Gen1,
and Gen2 will be supported soon.
Then, some registers are used from Gen1 only,
or from Gen2 only.
To avoid NULL pointer access, this patch adds
register accessible check function.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/sound/soc/sh/rcar/gen.c b/sound/soc/sh/rcar/gen.c
index 0ebea44e890fc29a0caadbe7d6c3bc84c62e7d82..970439d5ec0e753a197a9f8d0c6df818b6aa933e 100644 (file)
--- a/sound/soc/sh/rcar/gen.c
+++ b/sound/soc/sh/rcar/gen.c
@@ -86,12 +86,28 @@ static struct regmap_bus rsnd_regmap_bus = {
        .val_format_endian_default      = REGMAP_ENDIAN_NATIVE,
 };
 
+static int rsnd_is_accessible_reg(struct rsnd_priv *priv,
+                                 struct rsnd_gen *gen, enum rsnd_reg reg)
+{
+       if (!gen->regs[reg]) {
+               struct device *dev = rsnd_priv_to_dev(priv);
+
+               dev_err(dev, "unsupported register access %x\n", reg);
+               return 0;
+       }
+
+       return 1;
+}
+
 u32 rsnd_read(struct rsnd_priv *priv,
              struct rsnd_mod *mod, enum rsnd_reg reg)
 {
        struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
        u32 val;
 
+       if (!rsnd_is_accessible_reg(priv, gen, reg))
+               return 0;
+
        regmap_fields_read(gen->regs[reg], rsnd_mod_id(mod), &val);
 
        return val;
@@ -103,6 +119,9 @@ void rsnd_write(struct rsnd_priv *priv,
 {
        struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
 
+       if (!rsnd_is_accessible_reg(priv, gen, reg))
+               return;
+
        regmap_fields_write(gen->regs[reg], rsnd_mod_id(mod), data);
 }
 
@@ -111,6 +130,9 @@ void rsnd_bset(struct rsnd_priv *priv, struct rsnd_mod *mod,
 {
        struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
 
+       if (!rsnd_is_accessible_reg(priv, gen, reg))
+               return;
+
        regmap_fields_update_bits(gen->regs[reg], rsnd_mod_id(mod),
                                  mask, data);
 }
@@ -134,6 +156,10 @@ static int rsnd_gen_regmap_init(struct rsnd_priv *priv,
        }
 
        for (i = 0; i < RSND_REG_MAX; i++) {
+               gen->regs[i] = NULL;
+               if (!regf[i].reg)
+                       continue;
+
                gen->regs[i] = devm_regmap_field_alloc(dev, gen->regmap, regf[i]);
                if (IS_ERR(gen->regs[i]))
                        return PTR_ERR(gen->regs[i]);