diff options
Diffstat (limited to 'sound/soc/codecs/rl6231.c')
| -rw-r--r-- | sound/soc/codecs/rl6231.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/sound/soc/codecs/rl6231.c b/sound/soc/codecs/rl6231.c new file mode 100644 index 000000000000..7b82fbe0d14c --- /dev/null +++ b/sound/soc/codecs/rl6231.c @@ -0,0 +1,152 @@ +/* + * rl6231.c - RL6231 class device shared support + * + * Copyright 2014 Realtek Semiconductor Corp. + * + * Author: Oder Chiou <oder_chiou@realtek.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/pm.h> +#include <linux/gpio.h> +#include <linux/i2c.h> +#include <linux/regmap.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/acpi.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <sound/soc-dapm.h> +#include <sound/initval.h> +#include <sound/tlv.h> + +#include "rl6231.h" + +/** + * rl6231_calc_dmic_clk - Calculate the parameter of dmic. + * + * @rate: base clock rate. + * + * Choose dmic clock between 1MHz and 3MHz. + * It is better for clock to approximate 3MHz. + */ +int rl6231_calc_dmic_clk(int rate) +{ + int div[] = {2, 3, 4, 6, 8, 12}, idx = -EINVAL; + int i, red, bound, temp; + + red = 3000000 * 12; + for (i = 0; i < ARRAY_SIZE(div); i++) { + bound = div[i] * 3000000; + if (rate > bound) + continue; + temp = bound - rate; + if (temp < red) { + red = temp; + idx = i; + } + } + + return idx; +} +EXPORT_SYMBOL_GPL(rl6231_calc_dmic_clk); + +/** + * rl6231_pll_calc - Calcualte PLL M/N/K code. + * @freq_in: external clock provided to codec. + * @freq_out: target clock which codec works on. + * @pll_code: Pointer to structure with M, N, K and bypass flag. + * + * Calcualte M/N/K code to configure PLL for codec. + * + * Returns 0 for success or negative error code. + */ +int rl6231_pll_calc(const unsigned int freq_in, + const unsigned int freq_out, struct rl6231_pll_code *pll_code) +{ + int max_n = RL6231_PLL_N_MAX, max_m = RL6231_PLL_M_MAX; + int k, red, n_t, pll_out, in_t, out_t; + int n = 0, m = 0, m_t = 0; + int red_t = abs(freq_out - freq_in); + bool bypass = false; + + if (RL6231_PLL_INP_MAX < freq_in || RL6231_PLL_INP_MIN > freq_in) + return -EINVAL; + + k = 100000000 / freq_out - 2; + if (k > RL6231_PLL_K_MAX) + k = RL6231_PLL_K_MAX; + for (n_t = 0; n_t <= max_n; n_t++) { + in_t = freq_in / (k + 2); + pll_out = freq_out / (n_t + 2); + if (in_t < 0) + continue; + if (in_t == pll_out) { + bypass = true; + n = n_t; + goto code_find; + } + red = abs(in_t - pll_out); + if (red < red_t) { + bypass = true; + n = n_t; + m = m_t; + if (red == 0) + goto code_find; + red_t = red; + } + for (m_t = 0; m_t <= max_m; m_t++) { + out_t = in_t / (m_t + 2); + red = abs(out_t - pll_out); + if (red < red_t) { + bypass = false; + n = n_t; + m = m_t; + if (red == 0) + goto code_find; + red_t = red; + } + } + } + pr_debug("Only get approximation about PLL\n"); + +code_find: + + pll_code->m_bp = bypass; + pll_code->m_code = m; + pll_code->n_code = n; + pll_code->k_code = k; + return 0; +} +EXPORT_SYMBOL_GPL(rl6231_pll_calc); + +int rl6231_get_clk_info(int sclk, int rate) +{ + int i, pd[] = {1, 2, 3, 4, 6, 8, 12, 16}; + + if (sclk <= 0 || rate <= 0) + return -EINVAL; + + rate = rate << 8; + for (i = 0; i < ARRAY_SIZE(pd); i++) + if (sclk == rate * pd[i]) + return i; + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(rl6231_get_clk_info); + +MODULE_DESCRIPTION("RL6231 class device shared support"); +MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>"); +MODULE_LICENSE("GPL v2"); |