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regmap: Support bulk reads for devices without raw formatting
When doing a bulk read from a device which lacks raw I/O support we fall back to doing register at a time reads but we still use the raw formatters in order to render the data into the word size used by the device (since bulk reads still operate on the device word size rather than unsigned ints). This means that devices without raw formatting such as those that provide reg_read() are not supported. Provide handling for them by copying the values read into native endian values of the appropriate size. Signed-off-by: Mark Brown <broonie@kernel.org>
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1 changed files with 28 additions and 1 deletions
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@ -2338,7 +2338,34 @@ int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
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&ival);
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if (ret != 0)
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return ret;
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map->format.format_val(val + (i * val_bytes), ival, 0);
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if (map->format.format_val) {
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map->format.format_val(val + (i * val_bytes), ival, 0);
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} else {
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/* Devices providing read and write
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* operations can use the bulk I/O
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* functions if they define a val_bytes,
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* we assume that the values are native
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* endian.
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*/
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u32 *u32 = val;
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u16 *u16 = val;
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u8 *u8 = val;
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switch (map->format.val_bytes) {
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case 4:
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u32[i] = ival;
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break;
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case 2:
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u16[i] = ival;
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break;
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case 1:
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u8[i] = ival;
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break;
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default:
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return -EINVAL;
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}
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}
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}
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}
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