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>
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dd775ae254
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@ -38,6 +38,7 @@ struct regmap {
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void *work_buf; /* Scratch buffer used to format I/O */
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struct regmap_format format; /* Buffer format */
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const struct regmap_bus *bus;
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void *bus_context;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *debugfs;
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@ -15,8 +15,9 @@
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#include <linux/module.h>
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#include <linux/init.h>
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static int regmap_i2c_write(struct device *dev, const void *data, size_t count)
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static int regmap_i2c_write(void *context, const void *data, size_t count)
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{
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struct device *dev = context;
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struct i2c_client *i2c = to_i2c_client(dev);
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int ret;
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@ -29,10 +30,11 @@ static int regmap_i2c_write(struct device *dev, const void *data, size_t count)
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return -EIO;
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}
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static int regmap_i2c_gather_write(struct device *dev,
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static int regmap_i2c_gather_write(void *context,
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const void *reg, size_t reg_size,
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const void *val, size_t val_size)
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{
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struct device *dev = context;
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struct i2c_client *i2c = to_i2c_client(dev);
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struct i2c_msg xfer[2];
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int ret;
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@ -62,10 +64,11 @@ static int regmap_i2c_gather_write(struct device *dev,
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return -EIO;
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}
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static int regmap_i2c_read(struct device *dev,
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static int regmap_i2c_read(void *context,
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const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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struct device *dev = context;
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struct i2c_client *i2c = to_i2c_client(dev);
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struct i2c_msg xfer[2];
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int ret;
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@ -107,7 +110,7 @@ static struct regmap_bus regmap_i2c = {
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struct regmap *regmap_init_i2c(struct i2c_client *i2c,
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const struct regmap_config *config)
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{
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return regmap_init(&i2c->dev, ®map_i2c, config);
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return regmap_init(&i2c->dev, ®map_i2c, &i2c->dev, config);
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}
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EXPORT_SYMBOL_GPL(regmap_init_i2c);
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@ -124,7 +127,7 @@ EXPORT_SYMBOL_GPL(regmap_init_i2c);
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struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c,
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const struct regmap_config *config)
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{
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return devm_regmap_init(&i2c->dev, ®map_i2c, config);
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return devm_regmap_init(&i2c->dev, ®map_i2c, &i2c->dev, config);
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}
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EXPORT_SYMBOL_GPL(devm_regmap_init_i2c);
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@ -15,17 +15,19 @@
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#include <linux/init.h>
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#include <linux/module.h>
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static int regmap_spi_write(struct device *dev, const void *data, size_t count)
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static int regmap_spi_write(void *context, const void *data, size_t count)
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{
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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return spi_write(spi, data, count);
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}
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static int regmap_spi_gather_write(struct device *dev,
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static int regmap_spi_gather_write(void *context,
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const void *reg, size_t reg_len,
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const void *val, size_t val_len)
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{
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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struct spi_message m;
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struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
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@ -38,10 +40,11 @@ static int regmap_spi_gather_write(struct device *dev,
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return spi_sync(spi, &m);
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}
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static int regmap_spi_read(struct device *dev,
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static int regmap_spi_read(void *context,
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const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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return spi_write_then_read(spi, reg, reg_size, val, val_size);
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@ -66,7 +69,7 @@ static struct regmap_bus regmap_spi = {
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struct regmap *regmap_init_spi(struct spi_device *spi,
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const struct regmap_config *config)
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{
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return regmap_init(&spi->dev, ®map_spi, config);
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return regmap_init(&spi->dev, ®map_spi, &spi->dev, config);
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}
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EXPORT_SYMBOL_GPL(regmap_init_spi);
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@ -83,7 +86,7 @@ EXPORT_SYMBOL_GPL(regmap_init_spi);
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struct regmap *devm_regmap_init_spi(struct spi_device *spi,
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const struct regmap_config *config)
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{
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return devm_regmap_init(&spi->dev, ®map_spi, config);
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return devm_regmap_init(&spi->dev, ®map_spi, &spi->dev, config);
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}
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EXPORT_SYMBOL_GPL(devm_regmap_init_spi);
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@ -163,6 +163,7 @@ static unsigned int regmap_parse_32(void *buf)
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*
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* @dev: Device that will be interacted with
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* @bus: Bus-specific callbacks to use with device
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* @bus_context: Data passed to bus-specific callbacks
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer to
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@ -171,6 +172,7 @@ static unsigned int regmap_parse_32(void *buf)
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*/
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struct regmap *regmap_init(struct device *dev,
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const struct regmap_bus *bus,
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void *bus_context,
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const struct regmap_config *config)
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{
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struct regmap *map;
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@ -193,6 +195,7 @@ struct regmap *regmap_init(struct device *dev,
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map->format.buf_size += map->format.pad_bytes;
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map->dev = dev;
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map->bus = bus;
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map->bus_context = bus_context;
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map->max_register = config->max_register;
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map->writeable_reg = config->writeable_reg;
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map->readable_reg = config->readable_reg;
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@ -316,6 +319,7 @@ static void devm_regmap_release(struct device *dev, void *res)
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*
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* @dev: Device that will be interacted with
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* @bus: Bus-specific callbacks to use with device
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* @bus_context: Data passed to bus-specific callbacks
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer
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@ -325,6 +329,7 @@ static void devm_regmap_release(struct device *dev, void *res)
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*/
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struct regmap *devm_regmap_init(struct device *dev,
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const struct regmap_bus *bus,
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void *bus_context,
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const struct regmap_config *config)
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{
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struct regmap **ptr, *regmap;
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@ -333,7 +338,7 @@ struct regmap *devm_regmap_init(struct device *dev,
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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regmap = regmap_init(dev, bus, config);
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regmap = regmap_init(dev, bus, bus_context, config);
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if (!IS_ERR(regmap)) {
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*ptr = regmap;
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devres_add(dev, ptr);
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@ -391,6 +396,8 @@ void regmap_exit(struct regmap *map)
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{
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regcache_exit(map);
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regmap_debugfs_exit(map);
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if (map->bus->free_context)
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map->bus->free_context(map->bus_context);
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kfree(map->work_buf);
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kfree(map);
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}
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@ -444,12 +451,12 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
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*/
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if (val == (map->work_buf + map->format.pad_bytes +
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map->format.reg_bytes))
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ret = map->bus->write(map->dev, map->work_buf,
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ret = map->bus->write(map->bus_context, map->work_buf,
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map->format.reg_bytes +
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map->format.pad_bytes +
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val_len);
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else if (map->bus->gather_write)
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ret = map->bus->gather_write(map->dev, map->work_buf,
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ret = map->bus->gather_write(map->bus_context, map->work_buf,
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map->format.reg_bytes +
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map->format.pad_bytes,
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val, val_len);
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@ -464,7 +471,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
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memcpy(buf, map->work_buf, map->format.reg_bytes);
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memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
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val, val_len);
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ret = map->bus->write(map->dev, buf, len);
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ret = map->bus->write(map->bus_context, buf, len);
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kfree(buf);
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}
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@ -498,7 +505,7 @@ int _regmap_write(struct regmap *map, unsigned int reg,
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trace_regmap_hw_write_start(map->dev, reg, 1);
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ret = map->bus->write(map->dev, map->work_buf,
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ret = map->bus->write(map->bus_context, map->work_buf,
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map->format.buf_size);
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trace_regmap_hw_write_done(map->dev, reg, 1);
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trace_regmap_hw_read_start(map->dev, reg,
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val_len / map->format.val_bytes);
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ret = map->bus->read(map->dev, map->work_buf,
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ret = map->bus->read(map->bus_context, map->work_buf,
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map->format.reg_bytes + map->format.pad_bytes,
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val, val_len);
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@ -97,14 +97,15 @@ struct regmap_config {
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u8 write_flag_mask;
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};
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typedef int (*regmap_hw_write)(struct device *dev, const void *data,
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typedef int (*regmap_hw_write)(void *context, const void *data,
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size_t count);
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typedef int (*regmap_hw_gather_write)(struct device *dev,
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typedef int (*regmap_hw_gather_write)(void *context,
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const void *reg, size_t reg_len,
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const void *val, size_t val_len);
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typedef int (*regmap_hw_read)(struct device *dev,
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typedef int (*regmap_hw_read)(void *context,
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const void *reg_buf, size_t reg_size,
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void *val_buf, size_t val_size);
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typedef void (*regmap_hw_free_context)(void *context);
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/**
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* Description of a hardware bus for the register map infrastructure.
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@ -121,11 +122,13 @@ struct regmap_bus {
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regmap_hw_write write;
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regmap_hw_gather_write gather_write;
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regmap_hw_read read;
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regmap_hw_free_context free_context;
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u8 read_flag_mask;
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};
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struct regmap *regmap_init(struct device *dev,
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const struct regmap_bus *bus,
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void *bus_context,
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const struct regmap_config *config);
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struct regmap *regmap_init_i2c(struct i2c_client *i2c,
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const struct regmap_config *config);
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struct regmap *devm_regmap_init(struct device *dev,
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const struct regmap_bus *bus,
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void *bus_context,
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const struct regmap_config *config);
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struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c,
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const struct regmap_config *config);
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