regmap: introduce explicit bus_context for bus callbacks
The only context needed by I2C and SPI bus definitions is the device
itself; this can be converted to an i2c_client or spi_device in order
to perform IO on the device. However, other bus types may need more
context in order to perform IO. Enable this by having regmap_init accept
a bus_context parameter, and pass this to all bus callbacks. The
existing callbacks simply pass the struct device here. Future bus types
may pass something else.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 7a3f535..bde30c5 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -163,6 +163,7 @@
*
* @dev: Device that will be interacted with
* @bus: Bus-specific callbacks to use with device
+ * @bus_context: Data passed to bus-specific callbacks
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer to
@@ -171,6 +172,7 @@
*/
struct regmap *regmap_init(struct device *dev,
const struct regmap_bus *bus,
+ void *bus_context,
const struct regmap_config *config)
{
struct regmap *map;
@@ -193,6 +195,7 @@
map->format.buf_size += map->format.pad_bytes;
map->dev = dev;
map->bus = bus;
+ map->bus_context = bus_context;
map->max_register = config->max_register;
map->writeable_reg = config->writeable_reg;
map->readable_reg = config->readable_reg;
@@ -316,6 +319,7 @@
*
* @dev: Device that will be interacted with
* @bus: Bus-specific callbacks to use with device
+ * @bus_context: Data passed to bus-specific callbacks
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer
@@ -325,6 +329,7 @@
*/
struct regmap *devm_regmap_init(struct device *dev,
const struct regmap_bus *bus,
+ void *bus_context,
const struct regmap_config *config)
{
struct regmap **ptr, *regmap;
@@ -333,7 +338,7 @@
if (!ptr)
return ERR_PTR(-ENOMEM);
- regmap = regmap_init(dev, bus, config);
+ regmap = regmap_init(dev, bus, bus_context, config);
if (!IS_ERR(regmap)) {
*ptr = regmap;
devres_add(dev, ptr);
@@ -391,6 +396,8 @@
{
regcache_exit(map);
regmap_debugfs_exit(map);
+ if (map->bus->free_context)
+ map->bus->free_context(map->bus_context);
kfree(map->work_buf);
kfree(map);
}
@@ -444,12 +451,12 @@
*/
if (val == (map->work_buf + map->format.pad_bytes +
map->format.reg_bytes))
- ret = map->bus->write(map->dev, map->work_buf,
+ 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->bus->gather_write(map->dev, map->work_buf,
+ ret = map->bus->gather_write(map->bus_context, map->work_buf,
map->format.reg_bytes +
map->format.pad_bytes,
val, val_len);
@@ -464,7 +471,7 @@
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->dev, buf, len);
+ ret = map->bus->write(map->bus_context, buf, len);
kfree(buf);
}
@@ -498,7 +505,7 @@
trace_regmap_hw_write_start(map->dev, reg, 1);
- ret = map->bus->write(map->dev, map->work_buf,
+ ret = map->bus->write(map->bus_context, map->work_buf,
map->format.buf_size);
trace_regmap_hw_write_done(map->dev, reg, 1);
@@ -639,7 +646,7 @@
trace_regmap_hw_read_start(map->dev, reg,
val_len / map->format.val_bytes);
- ret = map->bus->read(map->dev, map->work_buf,
+ ret = map->bus->read(map->bus_context, map->work_buf,
map->format.reg_bytes + map->format.pad_bytes,
val, val_len);