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authorMark Brown <broonie@linaro.org>2013-10-28 13:01:34 -0700
committerMark Brown <broonie@linaro.org>2013-10-28 13:01:34 -0700
commit18f513db93408fdeeba68d5b0931bc26315d28b4 (patch)
tree111d33e40ac84adea0c625a393d5724a69d0da4b /drivers/base/regmap/regmap.c
parent6cf3d823230794a6e6b3f99541cdb91176614036 (diff)
parente33fabd365596178e72f62bb4b89f0aaad0509ad (diff)
downloadlinux-linaro-stable-18f513db93408fdeeba68d5b0931bc26315d28b4.tar.gz
Merge remote-tracking branch 'regmap/topic/multi' into regmap-next
Diffstat (limited to 'drivers/base/regmap/regmap.c')
-rw-r--r--drivers/base/regmap/regmap.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index c7111d0d16fb..9c021d9cace0 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1564,6 +1564,47 @@ out:
}
EXPORT_SYMBOL_GPL(regmap_bulk_write);
+/*
+ * regmap_multi_reg_write(): Write multiple registers to the device
+ *
+ * where the set of register are supplied in any order
+ *
+ * @map: Register map to write to
+ * @regs: Array of structures containing register,value to be written
+ * @num_regs: Number of registers to write
+ *
+ * This function is intended to be used for writing a large block of data
+ * atomically to the device in single transfer for those I2C client devices
+ * that implement this alternative block write mode.
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_multi_reg_write(struct regmap *map, struct reg_default *regs,
+ int num_regs)
+{
+ int ret = 0, i;
+
+ for (i = 0; i < num_regs; i++) {
+ int reg = regs[i].reg;
+ if (reg % map->reg_stride)
+ return -EINVAL;
+ }
+
+ map->lock(map->lock_arg);
+
+ for (i = 0; i < num_regs; i++) {
+ ret = _regmap_write(map, regs[i].reg, regs[i].def);
+ if (ret != 0)
+ goto out;
+ }
+out:
+ map->unlock(map->lock_arg);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
+
/**
* regmap_raw_write_async(): Write raw values to one or more registers
* asynchronously