--- /dev/null
+/*
+ * wm8978.c -- WM8978 ALSA SoC Audio Codec driver
+ *
+ * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ * Copyright (C) 2007 Carlos Munoz <carlos@kenati.com>
+ * Copyright 2006-2009 Wolfson Microelectronics PLC.
+ * Based on wm8974 and wm8990 by Liam Girdwood <lrg@slimlogic.co.uk>
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.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 <asm/div64.h>
+
+#include "wm8978.h"
+
+static struct snd_soc_codec *wm8978_codec;
+
+/* wm8978 register cache. Note that register 0 is not included in the cache. */
+static const u16 wm8978_reg[WM8978_CACHEREGNUM] = {
+ 0x0000, 0x0000, 0x0000, 0x0000, /* 0x00...0x03 */
+ 0x0050, 0x0000, 0x0140, 0x0000, /* 0x04...0x07 */
+ 0x0000, 0x0000, 0x0000, 0x00ff, /* 0x08...0x0b */
+ 0x00ff, 0x0000, 0x0100, 0x00ff, /* 0x0c...0x0f */
+ 0x00ff, 0x0000, 0x012c, 0x002c, /* 0x10...0x13 */
+ 0x002c, 0x002c, 0x002c, 0x0000, /* 0x14...0x17 */
+ 0x0032, 0x0000, 0x0000, 0x0000, /* 0x18...0x1b */
+ 0x0000, 0x0000, 0x0000, 0x0000, /* 0x1c...0x1f */
+ 0x0038, 0x000b, 0x0032, 0x0000, /* 0x20...0x23 */
+ 0x0008, 0x000c, 0x0093, 0x00e9, /* 0x24...0x27 */
+ 0x0000, 0x0000, 0x0000, 0x0000, /* 0x28...0x2b */
+ 0x0033, 0x0010, 0x0010, 0x0100, /* 0x2c...0x2f */
+ 0x0100, 0x0002, 0x0001, 0x0001, /* 0x30...0x33 */
+ 0x0039, 0x0039, 0x0039, 0x0039, /* 0x34...0x37 */
+ 0x0001, 0x0001, /* 0x38...0x3b */
+};
+
+/* codec private data */
+struct wm8978_priv {
+ struct snd_soc_codec codec;
+ unsigned int f_pllout;
+ unsigned int f_mclk;
+ unsigned int f_256fs;
+ unsigned int f_opclk;
+ enum wm8978_sysclk_src sysclk;
+ u16 reg_cache[WM8978_CACHEREGNUM];
+};
+
+static const char *wm8978_companding[] = {"Off", "NC", "u-law", "A-law"};
+static const char *wm8978_eqmode[] = {"Capture", "Playback"};
+static const char *wm8978_bw[] = {"Narrow", "Wide"};
+static const char *wm8978_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz"};
+static const char *wm8978_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz"};
+static const char *wm8978_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz"};
+static const char *wm8978_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz"};
+static const char *wm8978_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz"};
+static const char *wm8978_alc3[] = {"ALC", "Limiter"};
+static const char *wm8978_alc1[] = {"Off", "Right", "Left", "Both"};
+
+static const SOC_ENUM_SINGLE_DECL(adc_compand, WM8978_COMPANDING_CONTROL, 1,
+ wm8978_companding);
+static const SOC_ENUM_SINGLE_DECL(dac_compand, WM8978_COMPANDING_CONTROL, 3,
+ wm8978_companding);
+static const SOC_ENUM_SINGLE_DECL(eqmode, WM8978_EQ1, 8, wm8978_eqmode);
+static const SOC_ENUM_SINGLE_DECL(eq1, WM8978_EQ1, 5, wm8978_eq1);
+static const SOC_ENUM_SINGLE_DECL(eq2bw, WM8978_EQ2, 8, wm8978_bw);
+static const SOC_ENUM_SINGLE_DECL(eq2, WM8978_EQ2, 5, wm8978_eq2);
+static const SOC_ENUM_SINGLE_DECL(eq3bw, WM8978_EQ3, 8, wm8978_bw);
+static const SOC_ENUM_SINGLE_DECL(eq3, WM8978_EQ3, 5, wm8978_eq3);
+static const SOC_ENUM_SINGLE_DECL(eq4bw, WM8978_EQ4, 8, wm8978_bw);
+static const SOC_ENUM_SINGLE_DECL(eq4, WM8978_EQ4, 5, wm8978_eq4);
+static const SOC_ENUM_SINGLE_DECL(eq5, WM8978_EQ5, 5, wm8978_eq5);
+static const SOC_ENUM_SINGLE_DECL(alc3, WM8978_ALC_CONTROL_3, 8, wm8978_alc3);
+static const SOC_ENUM_SINGLE_DECL(alc1, WM8978_ALC_CONTROL_1, 7, wm8978_alc1);
+
+static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
+static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
+static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
+static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);
+static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1);
+
+static const struct snd_kcontrol_new wm8978_snd_controls[] = {
+
+ SOC_SINGLE("Digital Loopback Switch",
+ WM8978_COMPANDING_CONTROL, 0, 1, 0),
+
+ SOC_ENUM("ADC Companding", adc_compand),
+ SOC_ENUM("DAC Companding", dac_compand),
+
+ SOC_DOUBLE("DAC Inversion Switch", WM8978_DAC_CONTROL, 0, 1, 1, 0),
+
+ SOC_DOUBLE_R_TLV("PCM Volume",
+ WM8978_LEFT_DAC_DIGITAL_VOLUME, WM8978_RIGHT_DAC_DIGITAL_VOLUME,
+ 0, 255, 0, digital_tlv),
+
+ SOC_SINGLE("High Pass Filter Switch", WM8978_ADC_CONTROL, 8, 1, 0),
+ SOC_SINGLE("High Pass Cut Off", WM8978_ADC_CONTROL, 4, 7, 0),
+ SOC_DOUBLE("ADC Inversion Switch", WM8978_ADC_CONTROL, 0, 1, 1, 0),
+
+ SOC_DOUBLE_R_TLV("ADC Volume",
+ WM8978_LEFT_ADC_DIGITAL_VOLUME, WM8978_RIGHT_ADC_DIGITAL_VOLUME,
+ 0, 255, 0, digital_tlv),
+
+ SOC_ENUM("Equaliser Function", eqmode),
+ SOC_ENUM("EQ1 Cut Off", eq1),
+ SOC_SINGLE_TLV("EQ1 Volume", WM8978_EQ1, 0, 24, 1, eq_tlv),
+
+ SOC_ENUM("Equaliser EQ2 Bandwith", eq2bw),
+ SOC_ENUM("EQ2 Cut Off", eq2),
+ SOC_SINGLE_TLV("EQ2 Volume", WM8978_EQ2, 0, 24, 1, eq_tlv),
+
+ SOC_ENUM("Equaliser EQ3 Bandwith", eq3bw),
+ SOC_ENUM("EQ3 Cut Off", eq3),
+ SOC_SINGLE_TLV("EQ3 Volume", WM8978_EQ3, 0, 24, 1, eq_tlv),
+
+ SOC_ENUM("Equaliser EQ4 Bandwith", eq4bw),
+ SOC_ENUM("EQ4 Cut Off", eq4),
+ SOC_SINGLE_TLV("EQ4 Volume", WM8978_EQ4, 0, 24, 1, eq_tlv),
+
+ SOC_ENUM("EQ5 Cut Off", eq5),
+ SOC_SINGLE_TLV("EQ5 Volume", WM8978_EQ5, 0, 24, 1, eq_tlv),
+
+ SOC_SINGLE("DAC Playback Limiter Switch",
+ WM8978_DAC_LIMITER_1, 8, 1, 0),
+ SOC_SINGLE("DAC Playback Limiter Decay",
+ WM8978_DAC_LIMITER_1, 4, 15, 0),
+ SOC_SINGLE("DAC Playback Limiter Attack",
+ WM8978_DAC_LIMITER_1, 0, 15, 0),
+
+ SOC_SINGLE("DAC Playback Limiter Threshold",
+ WM8978_DAC_LIMITER_2, 4, 7, 0),
+ SOC_SINGLE("DAC Playback Limiter Boost",
+ WM8978_DAC_LIMITER_2, 0, 15, 0),
+
+ SOC_ENUM("ALC Enable Switch", alc1),
+ SOC_SINGLE("ALC Capture Min Gain", WM8978_ALC_CONTROL_1, 0, 7, 0),
+ SOC_SINGLE("ALC Capture Max Gain", WM8978_ALC_CONTROL_1, 3, 7, 0),
+
+ SOC_SINGLE("ALC Capture Hold", WM8978_ALC_CONTROL_2, 4, 7, 0),
+ SOC_SINGLE("ALC Capture Target", WM8978_ALC_CONTROL_2, 0, 15, 0),
+
+ SOC_ENUM("ALC Capture Mode", alc3),
+ SOC_SINGLE("ALC Capture Decay", WM8978_ALC_CONTROL_3, 4, 15, 0),
+ SOC_SINGLE("ALC Capture Attack", WM8978_ALC_CONTROL_3, 0, 15, 0),
+
+ SOC_SINGLE("ALC Capture Noise Gate Switch", WM8978_NOISE_GATE, 3, 1, 0),
+ SOC_SINGLE("ALC Capture Noise Gate Threshold",
+ WM8978_NOISE_GATE, 0, 7, 0),
+
+ SOC_DOUBLE_R("Capture PGA ZC Switch",
+ WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
+ 7, 1, 0),
+
+ /* OUT1 - Headphones */
+ SOC_DOUBLE_R("Headphone Playback ZC Switch",
+ WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 7, 1, 0),
+
+ SOC_DOUBLE_R_TLV("Headphone Playback Volume",
+ WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL,
+ 0, 63, 0, spk_tlv),
+
+ /* OUT2 - Speakers */
+ SOC_DOUBLE_R("Speaker Playback ZC Switch",
+ WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 7, 1, 0),
+
+ SOC_DOUBLE_R_TLV("Speaker Playback Volume",
+ WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL,
+ 0, 63, 0, spk_tlv),
+
+ /* OUT3/4 - Line Output */
+ SOC_DOUBLE_R("Line Playback Switch",
+ WM8978_OUT3_MIXER_CONTROL, WM8978_OUT4_MIXER_CONTROL, 6, 1, 1),
+
+ /* Mixer #3: Boost (Input) mixer */
+ SOC_DOUBLE_R("PGA Boost (+20dB)",
+ WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
+ 8, 1, 0),
+ SOC_DOUBLE_R_TLV("L2/R2 Boost Volume",
+ WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
+ 4, 7, 0, boost_tlv),
+ SOC_DOUBLE_R_TLV("Aux Boost Volume",
+ WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
+ 0, 7, 0, boost_tlv),
+
+ /* Input PGA volume */
+ SOC_DOUBLE_R_TLV("Input PGA Volume",
+ WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
+ 0, 63, 0, inpga_tlv),
+
+ /* Headphone */
+ SOC_DOUBLE_R("Headphone Switch",
+ WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 6, 1, 1),
+
+ /* Speaker */
+ SOC_DOUBLE_R("Speaker Switch",
+ WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 6, 1, 1),
+};
+
+/* Mixer #1: Output (OUT1, OUT2) Mixer: mix AUX, Input mixer output and DAC */
+static const struct snd_kcontrol_new wm8978_left_out_mixer[] = {
+ SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_LEFT_MIXER_CONTROL, 1, 1, 0),
+ SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_LEFT_MIXER_CONTROL, 5, 1, 0),
+ SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_LEFT_MIXER_CONTROL, 0, 1, 0),
+};
+
+static const struct snd_kcontrol_new wm8978_right_out_mixer[] = {
+ SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_RIGHT_MIXER_CONTROL, 1, 1, 0),
+ SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 5, 1, 0),
+ SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 0, 1, 0),
+};
+
+/* OUT3/OUT4 Mixer not implemented */
+
+/* Mixer #2: Input PGA Mute */
+static const struct snd_kcontrol_new wm8978_left_input_mixer[] = {
+ SOC_DAPM_SINGLE("L2 Switch", WM8978_INPUT_CONTROL, 2, 1, 0),
+ SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 1, 1, 0),
+ SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 0, 1, 0),
+};
+static const struct snd_kcontrol_new wm8978_right_input_mixer[] = {
+ SOC_DAPM_SINGLE("R2 Switch", WM8978_INPUT_CONTROL, 6, 1, 0),
+ SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 5, 1, 0),
+ SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 4, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget wm8978_dapm_widgets[] = {
+ SND_SOC_DAPM_DAC("Left DAC", "Left HiFi Playback",
+ WM8978_POWER_MANAGEMENT_3, 0, 0),
+ SND_SOC_DAPM_DAC("Right DAC", "Right HiFi Playback",
+ WM8978_POWER_MANAGEMENT_3, 1, 0),
+ SND_SOC_DAPM_ADC("Left ADC", "Left HiFi Capture",
+ WM8978_POWER_MANAGEMENT_2, 0, 0),
+ SND_SOC_DAPM_ADC("Right ADC", "Right HiFi Capture",
+ WM8978_POWER_MANAGEMENT_2, 1, 0),
+
+ /* Mixer #1: OUT1,2 */
+ SOC_MIXER_ARRAY("Left Output Mixer", WM8978_POWER_MANAGEMENT_3,
+ 2, 0, wm8978_left_out_mixer),
+ SOC_MIXER_ARRAY("Right Output Mixer", WM8978_POWER_MANAGEMENT_3,
+ 3, 0, wm8978_right_out_mixer),
+
+ SOC_MIXER_ARRAY("Left Input Mixer", WM8978_POWER_MANAGEMENT_2,
+ 2, 0, wm8978_left_input_mixer),
+ SOC_MIXER_ARRAY("Right Input Mixer", WM8978_POWER_MANAGEMENT_2,
+ 3, 0, wm8978_right_input_mixer),
+
+ SND_SOC_DAPM_PGA("Left Boost Mixer", WM8978_POWER_MANAGEMENT_2,
+ 4, 0, NULL, 0),
+ SND_SOC_DAPM_PGA("Right Boost Mixer", WM8978_POWER_MANAGEMENT_2,
+ 5, 0, NULL, 0),
+
+ SND_SOC_DAPM_PGA("Left Capture PGA", WM8978_LEFT_INP_PGA_CONTROL,
+ 6, 1, NULL, 0),
+ SND_SOC_DAPM_PGA("Right Capture PGA", WM8978_RIGHT_INP_PGA_CONTROL,
+ 6, 1, NULL, 0),
+
+ SND_SOC_DAPM_PGA("Left Headphone Out", WM8978_POWER_MANAGEMENT_2,
+ 7, 0, NULL, 0),
+ SND_SOC_DAPM_PGA("Right Headphone Out", WM8978_POWER_MANAGEMENT_2,
+ 8, 0, NULL, 0),
+
+ SND_SOC_DAPM_PGA("Left Speaker Out", WM8978_POWER_MANAGEMENT_3,
+ 6, 0, NULL, 0),
+ SND_SOC_DAPM_PGA("Right Speaker Out", WM8978_POWER_MANAGEMENT_3,
+ 5, 0, NULL, 0),
+
+ SND_SOC_DAPM_MIXER("OUT4 VMID", WM8978_POWER_MANAGEMENT_3,
+ 8, 0, NULL, 0),
+
+ SND_SOC_DAPM_MICBIAS("Mic Bias", WM8978_POWER_MANAGEMENT_1, 4, 0),
+
+ SND_SOC_DAPM_INPUT("LMICN"),
+ SND_SOC_DAPM_INPUT("LMICP"),
+ SND_SOC_DAPM_INPUT("RMICN"),
+ SND_SOC_DAPM_INPUT("RMICP"),
+ SND_SOC_DAPM_INPUT("LAUX"),
+ SND_SOC_DAPM_INPUT("RAUX"),
+ SND_SOC_DAPM_INPUT("L2"),
+ SND_SOC_DAPM_INPUT("R2"),
+ SND_SOC_DAPM_OUTPUT("LHP"),
+ SND_SOC_DAPM_OUTPUT("RHP"),
+ SND_SOC_DAPM_OUTPUT("LSPK"),
+ SND_SOC_DAPM_OUTPUT("RSPK"),
+};
+
+static const struct snd_soc_dapm_route audio_map[] = {
+ /* Output mixer */
+ {"Right Output Mixer", "PCM Playback Switch", "Right DAC"},
+ {"Right Output Mixer", "Aux Playback Switch", "RAUX"},
+ {"Right Output Mixer", "Line Bypass Switch", "Right Boost Mixer"},
+
+ {"Left Output Mixer", "PCM Playback Switch", "Left DAC"},
+ {"Left Output Mixer", "Aux Playback Switch", "LAUX"},
+ {"Left Output Mixer", "Line Bypass Switch", "Left Boost Mixer"},
+
+ /* Outputs */
+ {"Right Headphone Out", NULL, "Right Output Mixer"},
+ {"RHP", NULL, "Right Headphone Out"},
+
+ {"Left Headphone Out", NULL, "Left Output Mixer"},
+ {"LHP", NULL, "Left Headphone Out"},
+
+ {"Right Speaker Out", NULL, "Right Output Mixer"},
+ {"RSPK", NULL, "Right Speaker Out"},
+
+ {"Left Speaker Out", NULL, "Left Output Mixer"},
+ {"LSPK", NULL, "Left Speaker Out"},
+
+ /* Boost Mixer */
+ {"Right ADC", NULL, "Right Boost Mixer"},
+
+ {"Right Boost Mixer", NULL, "RAUX"},
+ {"Right Boost Mixer", NULL, "Right Capture PGA"},
+ {"Right Boost Mixer", NULL, "R2"},
+
+ {"Left ADC", NULL, "Left Boost Mixer"},
+
+ {"Left Boost Mixer", NULL, "LAUX"},
+ {"Left Boost Mixer", NULL, "Left Capture PGA"},
+ {"Left Boost Mixer", NULL, "L2"},
+
+ /* Input PGA */
+ {"Right Capture PGA", NULL, "Right Input Mixer"},
+ {"Left Capture PGA", NULL, "Left Input Mixer"},
+
+ {"Right Input Mixer", "R2 Switch", "R2"},
+ {"Right Input Mixer", "MicN Switch", "RMICN"},
+ {"Right Input Mixer", "MicP Switch", "RMICP"},
+
+ {"Left Input Mixer", "L2 Switch", "L2"},
+ {"Left Input Mixer", "MicN Switch", "LMICN"},
+ {"Left Input Mixer", "MicP Switch", "LMICP"},
+};
+
+static int wm8978_add_widgets(struct snd_soc_codec *codec)
+{
+ snd_soc_dapm_new_controls(codec, wm8978_dapm_widgets,
+ ARRAY_SIZE(wm8978_dapm_widgets));
+
+ /* set up the WM8978 audio map */
+ snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
+
+ return 0;
+}
+
+/* PLL divisors */
+struct wm8978_pll_div {
+ u32 k;
+ u8 n;
+ u8 div2;
+};
+
+#define FIXED_PLL_SIZE (1 << 24)
+
+static void pll_factors(struct wm8978_pll_div *pll_div, unsigned int target,
+ unsigned int source)
+{
+ u64 k_part;
+ unsigned int k, n_div, n_mod;
+
+ n_div = target / source;
+ if (n_div < 6) {
+ source >>= 1;
+ pll_div->div2 = 1;
+ n_div = target / source;
+ } else {
+ pll_div->div2 = 0;
+ }
+
+ if (n_div < 6 || n_div > 12)
+ dev_warn(wm8978_codec->dev,
+ "WM8978 N value exceeds recommended range! N = %u\n",
+ n_div);
+
+ pll_div->n = n_div;
+ n_mod = target - source * n_div;
+ k_part = FIXED_PLL_SIZE * (long long)n_mod + source / 2;
+
+ do_div(k_part, source);
+
+ k = k_part & 0xFFFFFFFF;
+
+ pll_div->k = k;
+}
+/*
+ * Calculate internal frequencies and dividers, according to Figure 40
+ * "PLL and Clock Select Circuit" in WM8978 datasheet Rev. 2.6
+ */
+static int wm8978_configure_pll(struct snd_soc_codec *codec)
+{
+ struct wm8978_priv *wm8978 = codec->private_data;
+ struct wm8978_pll_div pll_div;
+ unsigned int f_opclk = wm8978->f_opclk, f_mclk = wm8978->f_mclk,
+ f_256fs = wm8978->f_256fs;
+ unsigned int f2, opclk_div;
+
+ if (!f_mclk)
+ return -EINVAL;
+
+ if (f_opclk) {
+ /*
+ * The user needs OPCLK. Choose OPCLKDIV to put
+ * 6 <= R = f2 / f1 < 13, 1 <= OPCLKDIV <= 4.
+ * f_opclk = f_mclk * prescale * R / 4 / OPCLKDIV, where
+ * prescale = 1, or prescale = 2. Prescale is calculated inside
+ * pll_factors(). We have to select f_PLLOUT, such that
+ * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
+ * f_mclk * 3 / 16 <= f_opclk < f_mclk * 13 / 4.
+ */
+ if (16 * f_opclk < 3 * f_mclk || 4 * f_opclk >= 13 * f_mclk)
+ return -EINVAL;
+
+ if (4 * f_opclk < 3 * f_mclk)
+ /* Have to use OPCLKDIV */
+ opclk_div = (3 * f_mclk / 4 + f_opclk - 1) / f_opclk;
+ else
+ opclk_div = 1;
+
+ dev_dbg(codec->dev, "%s: OPCLKDIV=%d\n", __func__, opclk_div);
+
+ snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 0x30,
+ (opclk_div - 1) << 4);
+
+ wm8978->f_pllout = f_opclk * opclk_div;
+ } else if (f_256fs) {
+ /*
+ * Not using OPCLK, choose R:
+ * 6 <= R = f2 / f1 < 13, to put 1 <= MCLKDIV <= 12.
+ * f_256fs = f_mclk * prescale * R / 4 / MCLKDIV, where
+ * prescale = 1, or prescale = 2. Prescale is calculated inside
+ * pll_factors(). We have to select f_PLLOUT, such that
+ * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
+ * f_mclk * 3 / 48 <= f_256fs < f_mclk * 13 / 4. This means MCLK
+ * must be 3.781MHz <= f_MCLK <= 32.768MHz
+ */
+ if (48 * f_256fs < 3 * f_mclk || 4 * f_256fs >= 13 * f_mclk)
+ return -EINVAL;
+
+ /*
+ * MCLKDIV will be selected in .hw_params(), just choose a
+ * suitable f_PLLOUT
+ */
+ if (4 * f_256fs < 3 * f_mclk)
+ /* Will have to use MCLKDIV */
+ wm8978->f_pllout = wm8978->f_mclk * 3 / 4;
+ else
+ wm8978->f_pllout = f_256fs;
+
+ /* GPIO1 into default mode as input - before configuring PLL */
+ snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
+ } else {
+ return -EINVAL;
+ }
+
+ f2 = wm8978->f_pllout * 4;
+
+ dev_dbg(codec->dev, "%s: f_MCLK=%uHz, f_PLLOUT=%uHz\n", __func__,
+ wm8978->f_mclk, wm8978->f_pllout);
+
+ pll_factors(&pll_div, f2, wm8978->f_mclk);
+
+ dev_dbg(codec->dev, "%s: calculated PLL N=0x%x, K=0x%x, div2=%d\n",
+ __func__, pll_div.n, pll_div.k, pll_div.div2);
+
+ /* Turn PLL off for configuration... */
+ snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
+
+ snd_soc_write(codec, WM8978_PLL_N, (pll_div.div2 << 4) | pll_div.n);
+ snd_soc_write(codec, WM8978_PLL_K1, pll_div.k >> 18);
+ snd_soc_write(codec, WM8978_PLL_K2, (pll_div.k >> 9) & 0x1ff);
+ snd_soc_write(codec, WM8978_PLL_K3, pll_div.k & 0x1ff);
+
+ /* ...and on again */
+ snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
+
+ if (f_opclk)
+ /* Output PLL (OPCLK) to GPIO1 */
+ snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 4);
+
+ return 0;
+}
+
+/*
+ * Configure WM8978 clock dividers.
+ */
+static int wm8978_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
+ int div_id, int div)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ struct wm8978_priv *wm8978 = codec->private_data;
+ int ret = 0;
+
+ switch (div_id) {
+ case WM8978_OPCLKRATE:
+ wm8978->f_opclk = div;
+
+ if (wm8978->f_mclk)
+ ret = wm8978_configure_pll(codec);
+ break;
+ case WM8978_MCLKDIV:
+ if (div & ~0xe0)
+ return -EINVAL;
+ snd_soc_update_bits(codec, WM8978_CLOCKING, 0xe0, div);
+ break;
+ case WM8978_ADCCLK:
+ if (div & ~8)
+ return -EINVAL;
+ snd_soc_update_bits(codec, WM8978_ADC_CONTROL, 8, div);
+ break;
+ case WM8978_DACCLK:
+ if (div & ~8)
+ return -EINVAL;
+ snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 8, div);
+ break;
+ case WM8978_BCLKDIV:
+ if (div & ~0x1c)
+ return -EINVAL;
+ snd_soc_update_bits(codec, WM8978_CLOCKING, 0x1c, div);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ dev_dbg(codec->dev, "%s: ID %d, value %u\n", __func__, div_id, div);
+
+ return ret;
+}
+
+/*
+ * @freq: when .set_pll() us not used, freq is codec MCLK input frequency
+ */
+static int wm8978_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id,
+ unsigned int freq, int dir)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ struct wm8978_priv *wm8978 = codec->private_data;
+ int ret = 0;
+
+ dev_dbg(codec->dev, "%s: ID %d, freq %u\n", __func__, clk_id, freq);
+
+ if (freq) {
+ wm8978->f_mclk = freq;
+
+ /* Even if MCLK is used for system clock, might have to drive OPCLK */
+ if (wm8978->f_opclk)
+ ret = wm8978_configure_pll(codec);
+
+ /* Our sysclk is fixed to 256 * fs, will configure in .hw_params() */
+
+ if (!ret)
+ wm8978->sysclk = clk_id;
+ }
+
+ if (wm8978->sysclk == WM8978_PLL && (!freq || clk_id == WM8978_MCLK)) {
+ /* Clock CODEC directly from MCLK */
+ snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
+
+ /* GPIO1 into default mode as input - before configuring PLL */
+ snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
+
+ /* Turn off PLL */
+ snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
+ wm8978->sysclk = WM8978_MCLK;
+ wm8978->f_pllout = 0;
+ wm8978->f_opclk = 0;
+ }
+
+ return ret;
+}
+
+/*
+ * Set ADC and Voice DAC format.
+ */
+static int wm8978_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ /*
+ * BCLK polarity mask = 0x100, LRC clock polarity mask = 0x80,
+ * Data Format mask = 0x18: all will be calculated anew
+ */
+ u16 iface = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x198;
+ u16 clk = snd_soc_read(codec, WM8978_CLOCKING);
+
+ dev_dbg(codec->dev, "%s\n", __func__);
+
+ /* set master/slave audio interface */
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ clk |= 1;
+ break;
+ case SND_SOC_DAIFMT_CBS_CFS:
+ clk &= ~1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* interface format */
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ iface |= 0x10;
+ break;
+ case SND_SOC_DAIFMT_RIGHT_J:
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ iface |= 0x8;
+ break;
+ case SND_SOC_DAIFMT_DSP_A:
+ iface |= 0x18;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* clock inversion */
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ break;
+ case SND_SOC_DAIFMT_IB_IF:
+ iface |= 0x180;
+ break;
+ case SND_SOC_DAIFMT_IB_NF:
+ iface |= 0x100;
+ break;
+ case SND_SOC_DAIFMT_NB_IF:
+ iface |= 0x80;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface);
+ snd_soc_write(codec, WM8978_CLOCKING, clk);
+
+ return 0;
+}
+
+/* MCLK dividers */
+static const int mclk_numerator[] = {1, 3, 2, 3, 4, 6, 8, 12};
+static const int mclk_denominator[] = {1, 2, 1, 1, 1, 1, 1, 1};
+
+/*
+ * Set PCM DAI bit size and sample rate.
+ */
+static int wm8978_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_device *socdev = rtd->socdev;
+ struct snd_soc_codec *codec = socdev->card->codec;
+ struct wm8978_priv *wm8978 = codec->private_data;
+ /* Word length mask = 0x60 */
+ u16 iface_ctl = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x60;
+ /* Sampling rate mask = 0xe (for filters) */
+ u16 add_ctl = snd_soc_read(codec, WM8978_ADDITIONAL_CONTROL) & ~0xe;
+ u16 clking = snd_soc_read(codec, WM8978_CLOCKING);
+ enum wm8978_sysclk_src current_clk_id = clking & 0x100 ?
+ WM8978_PLL : WM8978_MCLK;
+ unsigned int f_sel, diff, diff_best = INT_MAX;
+ int i, best = 0;
+
+ if (!wm8978->f_mclk)
+ return -EINVAL;
+
+ /* bit size */
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ break;
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ iface_ctl |= 0x20;
+ break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ iface_ctl |= 0x40;
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ iface_ctl |= 0x60;
+ break;
+ }
+
+ /* filter coefficient */
+ switch (params_rate(params)) {
+ case 8000:
+ add_ctl |= 0x5 << 1;
+ break;
+ case 11025:
+ add_ctl |= 0x4 << 1;
+ break;
+ case 16000:
+ add_ctl |= 0x3 << 1;
+ break;
+ case 22050:
+ add_ctl |= 0x2 << 1;
+ break;
+ case 32000:
+ add_ctl |= 0x1 << 1;
+ break;
+ case 44100:
+ case 48000:
+ break;
+ }
+
+ /* Sampling rate is known now, can configure the MCLK divider */
+ wm8978->f_256fs = params_rate(params) * 256;
+
+ if (wm8978->sysclk == WM8978_MCLK) {
+ f_sel = wm8978->f_mclk;
+ } else {
+ if (!wm8978->f_pllout) {
+ int ret = wm8978_configure_pll(codec);
+ if (ret < 0)
+ return ret;
+ }
+ f_sel = wm8978->f_pllout;
+ }
+
+ /*
+ * In some cases it is possible to reconfigure PLL to a higher frequency
+ * by raising OPCLKDIV, but normally OPCLK is configured to 256 * fs or
+ * 512 * fs, so, we should be fine.
+ */
+ if (f_sel < wm8978->f_256fs || f_sel > 12 * wm8978->f_256fs)
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
+ diff = abs(wm8978->f_256fs * 3 -
+ f_sel * 3 * mclk_denominator[i] / mclk_numerator[i]);
+
+ if (diff < diff_best) {
+ diff_best = diff;
+ best = i;
+ }
+
+ if (!diff)
+ break;
+ }
+
+ if (diff)
+ dev_warn(codec->dev, "Imprecise clock: %u%s\n",
+ f_sel * mclk_denominator[best] / mclk_numerator[best],
+ wm8978->sysclk == WM8978_MCLK ?
+ ", consider using PLL" : "");
+
+ dev_dbg(codec->dev, "%s: fmt %d, rate %u, MCLK divisor #%d\n", __func__,
+ params_format(params), params_rate(params), best);
+
+ /* MCLK divisor mask = 0xe0 */
+ snd_soc_update_bits(codec, WM8978_CLOCKING, 0xe0, best << 5);
+
+ snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface_ctl);
+ snd_soc_write(codec, WM8978_ADDITIONAL_CONTROL, add_ctl);
+
+ if (wm8978->sysclk != current_clk_id) {
+ if (wm8978->sysclk == WM8978_PLL)
+ /* Run CODEC from PLL instead of MCLK */
+ snd_soc_update_bits(codec, WM8978_CLOCKING,
+ 0x100, 0x100);
+ else
+ /* Clock CODEC directly from MCLK */
+ snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
+ }
+
+ return 0;
+}
+
+static int wm8978_mute(struct snd_soc_dai *dai, int mute)
+{
+ struct snd_soc_codec *codec = dai->codec;
+
+ dev_dbg(codec->dev, "%s: %d\n", __func__, mute);
+
+ if (mute)
+ snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0x40);
+ else
+ snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0);
+
+ return 0;
+}
+
+static int wm8978_set_bias_level(struct snd_soc_codec *codec,
+ enum snd_soc_bias_level level)
+{
+ u16 power1 = snd_soc_read(codec, WM8978_POWER_MANAGEMENT_1) & ~3;
+
+ switch (level) {
+ case SND_SOC_BIAS_ON:
+ case SND_SOC_BIAS_PREPARE:
+ power1 |= 1; /* VMID 75k */
+ snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
+ break;
+ case SND_SOC_BIAS_STANDBY:
+ /* bit 3: enable bias, bit 2: enable I/O tie off buffer */
+ power1 |= 0xc;
+
+ if (codec->bias_level == SND_SOC_BIAS_OFF) {
+ /* Initial cap charge at VMID 5k */
+ snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1,
+ power1 | 0x3);
+ mdelay(100);
+ }
+
+ power1 |= 0x2; /* VMID 500k */
+ snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
+ break;
+ case SND_SOC_BIAS_OFF:
+ /* Preserve PLL - OPCLK may be used by someone */
+ snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, ~0x20, 0);
+ snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0);
+ snd_soc_write(codec, WM8978_POWER_MANAGEMENT_3, 0);
+ break;
+ }
+
+ dev_dbg(codec->dev, "%s: %d, %x\n", __func__, level, power1);
+
+ codec->bias_level = level;
+ return 0;
+}
+
+#define WM8978_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_soc_dai_ops wm8978_dai_ops = {
+ .hw_params = wm8978_hw_params,
+ .digital_mute = wm8978_mute,
+ .set_fmt = wm8978_set_dai_fmt,
+ .set_clkdiv = wm8978_set_dai_clkdiv,
+ .set_sysclk = wm8978_set_dai_sysclk,
+};
+
+/* Also supports 12kHz */
+struct snd_soc_dai wm8978_dai = {
+ .name = "WM8978 HiFi",
+ .id = 1,
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = WM8978_FORMATS,
+ },
+ .capture = {
+ .stream_name = "Capture",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = WM8978_FORMATS,
+ },
+ .ops = &wm8978_dai_ops,
+};
+EXPORT_SYMBOL_GPL(wm8978_dai);
+
+static int wm8978_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = socdev->card->codec;
+
+ wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
+ /* Also switch PLL off */
+ snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 0);
+ /* Put to sleep */
+ snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0x40);
+
+ return 0;
+}
+
+static int wm8978_resume(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = socdev->card->codec;
+ struct wm8978_priv *wm8978 = codec->private_data;
+ int i;
+ u16 *cache = codec->reg_cache;
+
+ /* Wake up the codec */
+ snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0);
+
+ /* Sync reg_cache with the hardware */
+ for (i = 0; i < ARRAY_SIZE(wm8978_reg); i++) {
+ if (i == WM8978_RESET)
+ continue;
+ if (cache[i] != wm8978_reg[i])
+ snd_soc_write(codec, i, cache[i]);
+ }
+
+ wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+ if (wm8978->f_pllout)
+ /* Switch PLL on */
+ snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
+
+ return 0;
+}
+
+static int wm8978_probe(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec;
+ int ret = 0;
+
+ if (wm8978_codec == NULL) {
+ dev_err(&pdev->dev, "Codec device not registered\n");
+ return -ENODEV;
+ }
+
+ socdev->card->codec = wm8978_codec;
+ codec = wm8978_codec;
+
+ /* register pcms */
+ ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+ if (ret < 0) {
+ dev_err(codec->dev, "failed to create pcms: %d\n", ret);
+ goto pcm_err;
+ }
+
+ snd_soc_add_controls(codec, wm8978_snd_controls,
+ ARRAY_SIZE(wm8978_snd_controls));
+ wm8978_add_widgets(codec);
+
+pcm_err:
+ return ret;
+}
+
+/* power down chip */
+static int wm8978_remove(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+
+ snd_soc_free_pcms(socdev);
+ snd_soc_dapm_free(socdev);
+
+ return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_wm8978 = {
+ .probe = wm8978_probe,
+ .remove = wm8978_remove,
+ .suspend = wm8978_suspend,
+ .resume = wm8978_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_wm8978);
+
+/*
+ * These registers contain an "update" bit - bit 8. This means, for example,
+ * that one can write new DAC digital volume for both channels, but only when
+ * the update bit is set, will also the volume be updated - simultaneously for
+ * both channels.
+ */
+static const int update_reg[] = {
+ WM8978_LEFT_DAC_DIGITAL_VOLUME,
+ WM8978_RIGHT_DAC_DIGITAL_VOLUME,
+ WM8978_LEFT_ADC_DIGITAL_VOLUME,
+ WM8978_RIGHT_ADC_DIGITAL_VOLUME,
+ WM8978_LEFT_INP_PGA_CONTROL,
+ WM8978_RIGHT_INP_PGA_CONTROL,
+ WM8978_LOUT1_HP_CONTROL,
+ WM8978_ROUT1_HP_CONTROL,
+ WM8978_LOUT2_SPK_CONTROL,
+ WM8978_ROUT2_SPK_CONTROL,
+};
+
+static __devinit int wm8978_register(struct wm8978_priv *wm8978)
+{
+ int ret, i;
+ struct snd_soc_codec *codec = &wm8978->codec;
+
+ if (wm8978_codec) {
+ dev_err(codec->dev, "Another WM8978 is registered\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Set default system clock to PLL, it is more precise, this is also the
+ * default hardware setting
+ */
+ wm8978->sysclk = WM8978_PLL;
+
+ mutex_init(&codec->mutex);
+ INIT_LIST_HEAD(&codec->dapm_widgets);
+ INIT_LIST_HEAD(&codec->dapm_paths);
+
+ codec->private_data = wm8978;
+ codec->name = "WM8978";
+ codec->owner = THIS_MODULE;
+ codec->bias_level = SND_SOC_BIAS_OFF;
+ codec->set_bias_level = wm8978_set_bias_level;
+ codec->dai = &wm8978_dai;
+ codec->num_dai = 1;
+ codec->reg_cache_size = WM8978_CACHEREGNUM;
+ codec->reg_cache = &wm8978->reg_cache;
+
+ ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
+ if (ret < 0) {
+ dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
+ goto err;
+ }
+
+ memcpy(codec->reg_cache, wm8978_reg, sizeof(wm8978_reg));
+
+ /*
+ * Set the update bit in all registers, that have one. This way all
+ * writes to those registers will also cause the update bit to be
+ * written.
+ */
+ for (i = 0; i < ARRAY_SIZE(update_reg); i++)
+ ((u16 *)codec->reg_cache)[update_reg[i]] |= 0x100;
+
+ /* Reset the codec */
+ ret = snd_soc_write(codec, WM8978_RESET, 0);
+ if (ret < 0) {
+ dev_err(codec->dev, "Failed to issue reset\n");
+ goto err;
+ }
+
+ wm8978_dai.dev = codec->dev;
+
+ wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+ wm8978_codec = codec;
+
+ ret = snd_soc_register_codec(codec);
+ if (ret != 0) {
+ dev_err(codec->dev, "Failed to register codec: %d\n", ret);
+ goto err;
+ }
+
+ ret = snd_soc_register_dai(&wm8978_dai);
+ if (ret != 0) {
+ dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
+ goto err_codec;
+ }
+
+ return 0;
+
+err_codec:
+ snd_soc_unregister_codec(codec);
+err:
+ kfree(wm8978);
+ return ret;
+}
+
+static __devexit void wm8978_unregister(struct wm8978_priv *wm8978)
+{
+ wm8978_set_bias_level(&wm8978->codec, SND_SOC_BIAS_OFF);
+ snd_soc_unregister_dai(&wm8978_dai);
+ snd_soc_unregister_codec(&wm8978->codec);
+ kfree(wm8978);
+ wm8978_codec = NULL;
+}
+
+static __devinit int wm8978_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct wm8978_priv *wm8978;
+ struct snd_soc_codec *codec;
+
+ wm8978 = kzalloc(sizeof(struct wm8978_priv), GFP_KERNEL);
+ if (wm8978 == NULL)
+ return -ENOMEM;
+
+ codec = &wm8978->codec;
+ codec->hw_write = (hw_write_t)i2c_master_send;
+
+ i2c_set_clientdata(i2c, wm8978);
+ codec->control_data = i2c;
+
+ codec->dev = &i2c->dev;
+
+ return wm8978_register(wm8978);
+}
+
+static __devexit int wm8978_i2c_remove(struct i2c_client *client)
+{
+ struct wm8978_priv *wm8978 = i2c_get_clientdata(client);
+ wm8978_unregister(wm8978);
+ return 0;
+}
+
+static const struct i2c_device_id wm8978_i2c_id[] = {
+ { "wm8978", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id);
+
+static struct i2c_driver wm8978_i2c_driver = {
+ .driver = {
+ .name = "WM8978",
+ .owner = THIS_MODULE,
+ },
+ .probe = wm8978_i2c_probe,
+ .remove = __devexit_p(wm8978_i2c_remove),
+ .id_table = wm8978_i2c_id,
+};
+
+static int __init wm8978_modinit(void)
+{
+ return i2c_add_driver(&wm8978_i2c_driver);
+}
+module_init(wm8978_modinit);
+
+static void __exit wm8978_exit(void)
+{
+ i2c_del_driver(&wm8978_i2c_driver);
+}
+module_exit(wm8978_exit);
+
+MODULE_DESCRIPTION("ASoC WM8978 codec driver");
+MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
+MODULE_LICENSE("GPL");
projects / linux-2.6-microblaze.git / commitdiff