/*
 * Shared helper functions for devices from the ADAU family
 *
 * Copyright 2011-2016 Analog Devices Inc.
 * Author: Lars-Peter Clausen <lars@metafoo.de>
 *
 * Licensed under the GPL-2 or later.
 */

#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");
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<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-10-15 12:09:13 -0700</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-10-15 12:09:13 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/drivers/opl4/opl4_lib.c?id=df34d04a6f09ba41037e58c3df6d6fbed0ffcde9'>df34d04a6f09ba41037e58c3df6d6fbed0ffcde9</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/drivers/opl4/opl4_lib.c?id=df34d04a6f09ba41037e58c3df6d6fbed0ffcde9'>patch</a>)</td></tr>
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<div class='commit-subject'>Merge tag 'befs-v4.9-rc1' of git://github.com/luisbg/linux-befs</div><div class='commit-msg'>Pull befs fixes from Luis de Bethencourt:
 "I recently took maintainership of the befs file system [0]. This is
  the first time I send you a git pull request, so please let me know if
  all the below is OK.

  Salah Triki and myself have been cleaning the code and fixing a few
  small bugs.

  Sorry I couldn't send this sooner in the merge window, I was waiting
  to have my GPG key signed by kernel members at ELCE in Berlin a few
  days ago."

[0] https://lkml.org/lkml/2016/7/27/502

* tag 'befs-v4.9-rc1' of git://github.com/luisbg/linux-befs: (39 commits)
  befs: befs: fix style issues in datastream.c
  befs: improve documentation in datastream.c
  befs: fix typos in datastream.c
  befs: fix typos in btree.c
  befs: fix style issues in super.c
  befs: fix comment style
  befs: add check for ag_shift in superblock
  befs: dump inode_size superblock information
  befs: remove unnecessary initialization
  befs: fix typo in befs_sb_info
  befs: add flags field to validate superblock state
  befs: fix typo in befs_find_key
  befs: remove unused BEFS_BT_PARMATCH
  fs: befs: remove ret variable
  fs: befs: remove in vain variable assignment
  fs: befs: remove unnecessary *befs_sb variable
  fs: befs: remove useless initialization to zero
  fs: befs: remove in vain variable assignment
  fs: befs: Insert NULL inode to dentry
  fs: befs: Remove useless calls to brelse in befs_find_brun_dblindirect
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=df34d04a6f09ba41037e58c3df6d6fbed0ffcde9'>Diffstat</a> (limited to 'sound/drivers/opl4/opl4_lib.c')</div><table summary='diffstat' class='diffstat'>