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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /sound/soc/codecs/adau-utils.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | sound/soc/codecs/adau-utils.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/sound/soc/codecs/adau-utils.c b/sound/soc/codecs/adau-utils.c new file mode 100644 index 0000000000..836940f2ab --- /dev/null +++ b/sound/soc/codecs/adau-utils.c @@ -0,0 +1,60 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Shared helper functions for devices from the ADAU family + * + * Copyright 2011-2016 Analog Devices Inc. + * Author: Lars-Peter Clausen <lars@metafoo.de> + */ + +#include <linux/gcd.h> +#include <linux/kernel.h> +#include <linux/module.h> + +#include "adau-utils.h" + +int adau_calc_pll_cfg(unsigned int freq_in, unsigned int freq_out, + uint8_t regs[5]) +{ + unsigned int r, n, m, i, j; + unsigned int div; + + if (!freq_out) { + r = 0; + n = 0; + m = 0; + div = 0; + } else { + if (freq_out % freq_in != 0) { + div = DIV_ROUND_UP(freq_in, 13500000); + freq_in /= div; + r = freq_out / freq_in; + i = freq_out % freq_in; + j = gcd(i, freq_in); + n = i / j; + m = freq_in / j; + div--; + } else { + r = freq_out / freq_in; + n = 0; + m = 0; + div = 0; + } + if (n > 0xffff || m > 0xffff || div > 3 || r > 8 || r < 2) + return -EINVAL; + } + + regs[0] = m >> 8; + regs[1] = m & 0xff; + regs[2] = n >> 8; + regs[3] = n & 0xff; + regs[4] = (r << 3) | (div << 1); + if (m != 0) + regs[4] |= 1; /* Fractional mode */ + + return 0; +} +EXPORT_SYMBOL_GPL(adau_calc_pll_cfg); + +MODULE_DESCRIPTION("ASoC ADAU audio CODECs shared helper functions"); +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); +MODULE_LICENSE("GPL v2"); |