mirror of https://gitee.com/openkylin/linux.git
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
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/*
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* rl6231.c - RL6231 class device shared support
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*
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* Copyright 2014 Realtek Semiconductor Corp.
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*
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* Author: Oder Chiou <oder_chiou@realtek.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/spi/spi.h>
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#include <linux/acpi.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/soc-dapm.h>
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#include <sound/initval.h>
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#include <sound/tlv.h>
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#include "rl6231.h"
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/**
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* rl6231_calc_dmic_clk - Calculate the parameter of dmic.
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*
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* @rate: base clock rate.
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*
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* Choose dmic clock between 1MHz and 3MHz.
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* It is better for clock to approximate 3MHz.
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*/
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int rl6231_calc_dmic_clk(int rate)
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{
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int div[] = {2, 3, 4, 6, 8, 12}, idx = -EINVAL;
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int i, red, bound, temp;
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red = 3000000 * 12;
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for (i = 0; i < ARRAY_SIZE(div); i++) {
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bound = div[i] * 3000000;
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if (rate > bound)
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continue;
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temp = bound - rate;
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if (temp < red) {
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red = temp;
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idx = i;
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}
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}
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return idx;
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}
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EXPORT_SYMBOL_GPL(rl6231_calc_dmic_clk);
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MODULE_DESCRIPTION("RL6231 class device shared support");
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MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
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MODULE_LICENSE("GPL v2");
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