1 files changed, 56 insertions, 47 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 43c0452a8ba9..aa9c6e0ff878 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -771,12 +771,15 @@ struct regmap *__regmap_init(struct device *dev,
 		map->reg_stride_order = ilog2(map->reg_stride);
 	else
 		map->reg_stride_order = -1;
-	map->use_single_read = config->use_single_read || !bus || !bus->read;
-	map->use_single_write = config->use_single_write || !bus || !bus->write;
-	map->can_multi_write = config->can_multi_write && bus && bus->write;
+	map->use_single_read = config->use_single_read || !(config->read || (bus && bus->read));
+	map->use_single_write = config->use_single_write || !(config->write || (bus && bus->write));
+	map->can_multi_write = config->can_multi_write && (config->write || (bus && bus->write));
 	if (bus) {
 		map->max_raw_read = bus->max_raw_read;
 		map->max_raw_write = bus->max_raw_write;
+	} else if (config->max_raw_read && config->max_raw_write) {
+		map->max_raw_read = config->max_raw_read;
+		map->max_raw_write = config->max_raw_write;
 	}
 	map->dev = dev;
 	map->bus = bus;
@@ -810,9 +813,19 @@ struct regmap *__regmap_init(struct device *dev,
 		map->read_flag_mask = bus->read_flag_mask;
 	}
 
-	if (!bus) {
+	if (config && config->read && config->write) {
+		map->reg_read  = _regmap_bus_read;
+
+		/* Bulk read/write */
+		map->read = config->read;
+		map->write = config->write;
+
+		reg_endian = REGMAP_ENDIAN_NATIVE;
+		val_endian = REGMAP_ENDIAN_NATIVE;
+	} else if (!bus) {
 		map->reg_read  = config->reg_read;
 		map->reg_write = config->reg_write;
+		map->reg_update_bits = config->reg_update_bits;
 
 		map->defer_caching = false;
 		goto skip_format_initialization;
@@ -825,10 +838,13 @@ struct regmap *__regmap_init(struct device *dev,
 	} else {
 		map->reg_read  = _regmap_bus_read;
 		map->reg_update_bits = bus->reg_update_bits;
-	}
+		/* Bulk read/write */
+		map->read = bus->read;
+		map->write = bus->write;
 
-	reg_endian = regmap_get_reg_endian(bus, config);
-	val_endian = regmap_get_val_endian(dev, bus, config);
+		reg_endian = regmap_get_reg_endian(bus, config);
+		val_endian = regmap_get_val_endian(dev, bus, config);
+	}
 
 	switch (config->reg_bits + map->reg_shift) {
 	case 2:
@@ -1363,7 +1379,7 @@ static int dev_get_regmap_match(struct device *dev, void *res, void *data)
 
 	/* If the user didn't specify a name match any */
 	if (data)
-		return !strcmp((*r)->name, data);
+		return (*r)->name && !strcmp((*r)->name, data);
 	else
 		return 1;
 }
@@ -1479,8 +1495,6 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
 	size_t len;
 	int i;
 
-	WARN_ON(!map->bus);
-
 	/* Check for unwritable or noinc registers in range
 	 * before we start
 	 */
@@ -1495,17 +1509,19 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
 	}
 
 	if (!map->cache_bypass && map->format.parse_val) {
-		unsigned int ival;
+		unsigned int ival, offset;
 		int val_bytes = map->format.val_bytes;
-		for (i = 0; i < val_len / val_bytes; i++) {
-			ival = map->format.parse_val(val + (i * val_bytes));
-			ret = regcache_write(map,
-					     reg + regmap_get_offset(map, i),
-					     ival);
+
+		/* Cache the last written value for noinc writes */
+		i = noinc ? val_len - val_bytes : 0;
+		for (; i < val_len; i += val_bytes) {
+			ival = map->format.parse_val(val + i);
+			offset = noinc ? 0 : regmap_get_offset(map, i / val_bytes);
+			ret = regcache_write(map, reg + offset, ival);
 			if (ret) {
 				dev_err(map->dev,
 					"Error in caching of register: %x ret: %d\n",
-					reg + regmap_get_offset(map, i), ret);
+					reg + offset, ret);
 				return ret;
 			}
 		}
@@ -1560,7 +1576,7 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
 		val = work_val;
 	}
 
-	if (map->async && map->bus->async_write) {
+	if (map->async && map->bus && map->bus->async_write) {
 		struct regmap_async *async;
 
 		trace_regmap_async_write_start(map, reg, val_len);
@@ -1628,11 +1644,11 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
 	 * write.
 	 */
 	if (val == work_val)
-		ret = map->bus->write(map->bus_context, map->work_buf,
-				      map->format.reg_bytes +
-				      map->format.pad_bytes +
-				      val_len);
-	else if (map->bus->gather_write)
+		ret = map->write(map->bus_context, map->work_buf,
+				 map->format.reg_bytes +
+				 map->format.pad_bytes +
+				 val_len);
+	else if (map->bus && map->bus->gather_write)
 		ret = map->bus->gather_write(map->bus_context, map->work_buf,
 					     map->format.reg_bytes +
 					     map->format.pad_bytes,
@@ -1650,7 +1666,7 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
 		memcpy(buf, map->work_buf, map->format.reg_bytes);
 		memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
 		       val, val_len);
-		ret = map->bus->write(map->bus_context, buf, len);
+		ret = map->write(map->bus_context, buf, len);
 
 		kfree(buf);
 	} else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
@@ -1707,7 +1723,7 @@ static int _regmap_bus_formatted_write(void *context, unsigned int reg,
 	struct regmap_range_node *range;
 	struct regmap *map = context;
 
-	WARN_ON(!map->bus || !map->format.format_write);
+	WARN_ON(!map->format.format_write);
 
 	range = _regmap_range_lookup(map, reg);
 	if (range) {
@@ -1720,8 +1736,7 @@ static int _regmap_bus_formatted_write(void *context, unsigned int reg,
 
 	trace_regmap_hw_write_start(map, reg, 1);
 
-	ret = map->bus->write(map->bus_context, map->work_buf,
-			      map->format.buf_size);
+	ret = map->write(map->bus_context, map->work_buf, map->format.buf_size);
 
 	trace_regmap_hw_write_done(map, reg, 1);
 
@@ -1741,7 +1756,7 @@ static int _regmap_bus_raw_write(void *context, unsigned int reg,
 {
 	struct regmap *map = context;
 
-	WARN_ON(!map->bus || !map->format.format_val);
+	WARN_ON(!map->format.format_val);
 
 	map->format.format_val(map->work_buf + map->format.reg_bytes
 			       + map->format.pad_bytes, val, 0);
@@ -1755,7 +1770,7 @@ static int _regmap_bus_raw_write(void *context, unsigned int reg,
 
 static inline void *_regmap_map_get_context(struct regmap *map)
 {
-	return (map->bus) ? map : map->bus_context;
+	return (map->bus || (!map->bus && map->read)) ? map : map->bus_context;
 }
 
 int _regmap_write(struct regmap *map, unsigned int reg,
@@ -1850,6 +1865,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
 	size_t val_count = val_len / val_bytes;
 	size_t chunk_count, chunk_bytes;
 	size_t chunk_regs = val_count;
+	size_t max_data = map->max_raw_write - map->format.reg_bytes -
+			map->format.pad_bytes;
 	int ret, i;
 
 	if (!val_count)
@@ -1857,8 +1874,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
 
 	if (map->use_single_write)
 		chunk_regs = 1;
-	else if (map->max_raw_write && val_len > map->max_raw_write)
-		chunk_regs = map->max_raw_write / val_bytes;
+	else if (map->max_raw_write && val_len > max_data)
+		chunk_regs = max_data / val_bytes;
 
 	chunk_count = val_count / chunk_regs;
 	chunk_bytes = chunk_regs * val_bytes;
@@ -2162,7 +2179,7 @@ static int _regmap_raw_multi_reg_write(struct regmap *map,
 	u8 = buf;
 	*u8 |= map->write_flag_mask;
 
-	ret = map->bus->write(map->bus_context, buf, len);
+	ret = map->write(map->bus_context, buf, len);
 
 	kfree(buf);
 
@@ -2460,9 +2477,7 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 	struct regmap_range_node *range;
 	int ret;
 
-	WARN_ON(!map->bus);
-
-	if (!map->bus || !map->bus->read)
+	if (!map->read)
 		return -EINVAL;
 
 	range = _regmap_range_lookup(map, reg);
@@ -2478,9 +2493,9 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 				      map->read_flag_mask);
 	trace_regmap_hw_read_start(map, reg, val_len / map->format.val_bytes);
 
-	ret = map->bus->read(map->bus_context, map->work_buf,
-			     map->format.reg_bytes + map->format.pad_bytes,
-			     val, val_len);
+	ret = map->read(map->bus_context, map->work_buf,
+			map->format.reg_bytes + map->format.pad_bytes,
+			val, val_len);
 
 	trace_regmap_hw_read_done(map, reg, val_len / map->format.val_bytes);
 
@@ -2591,8 +2606,6 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 	unsigned int v;
 	int ret, i;
 
-	if (!map->bus)
-		return -EINVAL;
 	if (val_len % map->format.val_bytes)
 		return -EINVAL;
 	if (!IS_ALIGNED(reg, map->reg_stride))
@@ -2607,7 +2620,7 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 		size_t chunk_count, chunk_bytes;
 		size_t chunk_regs = val_count;
 
-		if (!map->bus->read) {
+		if (!map->read) {
 			ret = -ENOTSUPP;
 			goto out;
 		}
@@ -2667,7 +2680,7 @@ EXPORT_SYMBOL_GPL(regmap_raw_read);
  * @val: Pointer to data buffer
  * @val_len: Length of output buffer in bytes.
  *
- * The regmap API usually assumes that bulk bus read operations will read a
+ * The regmap API usually assumes that bulk read operations will read a
  * range of registers. Some devices have certain registers for which a read
  * operation read will read from an internal FIFO.
  *
@@ -2685,10 +2698,6 @@ int regmap_noinc_read(struct regmap *map, unsigned int reg,
 	size_t read_len;
 	int ret;
 
-	if (!map->bus)
-		return -EINVAL;
-	if (!map->bus->read)
-		return -ENOTSUPP;
 	if (val_len % map->format.val_bytes)
 		return -EINVAL;
 	if (!IS_ALIGNED(reg, map->reg_stride))
@@ -2802,7 +2811,7 @@ int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
 	if (val_count == 0)
 		return -EINVAL;
 
-	if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
+	if (map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
 		ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
 		if (ret != 0)
 			return ret;