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443 lines
11 KiB
443 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* cx20442.c -- CX20442 ALSA Soc Audio driver |
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* |
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* Copyright 2009 Janusz Krzysztofik <[email protected]> |
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* |
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* Initially based on sound/soc/codecs/wm8400.c |
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* Copyright 2008, 2009 Wolfson Microelectronics PLC. |
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* Author: Mark Brown <[email protected]> |
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*/ |
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#include <linux/tty.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/regulator/consumer.h> |
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#include <sound/core.h> |
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#include <sound/initval.h> |
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#include <sound/soc.h> |
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#include "cx20442.h" |
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struct cx20442_priv { |
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struct tty_struct *tty; |
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struct regulator *por; |
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u8 reg_cache; |
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}; |
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#define CX20442_PM 0x0 |
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#define CX20442_TELIN 0 |
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#define CX20442_TELOUT 1 |
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#define CX20442_MIC 2 |
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#define CX20442_SPKOUT 3 |
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#define CX20442_AGC 4 |
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static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = { |
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SND_SOC_DAPM_OUTPUT("TELOUT"), |
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SND_SOC_DAPM_OUTPUT("SPKOUT"), |
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SND_SOC_DAPM_OUTPUT("AGCOUT"), |
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SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0), |
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SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0), |
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SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0), |
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SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0), |
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SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), |
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SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0), |
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SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0), |
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SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0), |
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SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0), |
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SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0), |
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SND_SOC_DAPM_INPUT("TELIN"), |
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SND_SOC_DAPM_INPUT("MIC"), |
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SND_SOC_DAPM_INPUT("AGCIN"), |
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}; |
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static const struct snd_soc_dapm_route cx20442_audio_map[] = { |
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{"TELOUT", NULL, "TELOUT Amp"}, |
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{"SPKOUT", NULL, "SPKOUT Mixer"}, |
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{"SPKOUT Mixer", NULL, "SPKOUT Amp"}, |
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{"TELOUT Amp", NULL, "DAC"}, |
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{"SPKOUT Amp", NULL, "DAC"}, |
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{"SPKOUT Mixer", NULL, "SPKOUT AGC"}, |
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{"SPKOUT AGC", NULL, "AGCIN"}, |
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{"AGCOUT", NULL, "MIC AGC"}, |
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{"MIC AGC", NULL, "MIC"}, |
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{"MIC Bias", NULL, "MIC"}, |
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{"Input Mixer", NULL, "MIC Bias"}, |
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{"TELIN Bias", NULL, "TELIN"}, |
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{"Input Mixer", NULL, "TELIN Bias"}, |
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{"ADC", NULL, "Input Mixer"}, |
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}; |
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static unsigned int cx20442_read_reg_cache(struct snd_soc_component *component, |
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unsigned int reg) |
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{ |
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struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component); |
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if (reg >= 1) |
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return -EINVAL; |
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return cx20442->reg_cache; |
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} |
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enum v253_vls { |
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V253_VLS_NONE = 0, |
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V253_VLS_T, |
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V253_VLS_L, |
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V253_VLS_LT, |
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V253_VLS_S, |
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V253_VLS_ST, |
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V253_VLS_M, |
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V253_VLS_MST, |
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V253_VLS_S1, |
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V253_VLS_S1T, |
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V253_VLS_MS1T, |
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V253_VLS_M1, |
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V253_VLS_M1ST, |
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V253_VLS_M1S1T, |
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V253_VLS_H, |
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V253_VLS_HT, |
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V253_VLS_MS, |
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V253_VLS_MS1, |
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V253_VLS_M1S, |
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V253_VLS_M1S1, |
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V253_VLS_TEST, |
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}; |
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static int cx20442_pm_to_v253_vls(u8 value) |
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{ |
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switch (value & ~(1 << CX20442_AGC)) { |
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case 0: |
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return V253_VLS_T; |
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case (1 << CX20442_SPKOUT): |
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case (1 << CX20442_MIC): |
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case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC): |
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return V253_VLS_M1S1; |
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case (1 << CX20442_TELOUT): |
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case (1 << CX20442_TELIN): |
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case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN): |
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return V253_VLS_L; |
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case (1 << CX20442_TELOUT) | (1 << CX20442_MIC): |
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return V253_VLS_NONE; |
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} |
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return -EINVAL; |
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} |
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static int cx20442_pm_to_v253_vsp(u8 value) |
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{ |
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switch (value & ~(1 << CX20442_AGC)) { |
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case (1 << CX20442_SPKOUT): |
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case (1 << CX20442_MIC): |
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case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC): |
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return (bool)(value & (1 << CX20442_AGC)); |
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} |
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return (value & (1 << CX20442_AGC)) ? -EINVAL : 0; |
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} |
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static int cx20442_write(struct snd_soc_component *component, unsigned int reg, |
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unsigned int value) |
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{ |
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struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component); |
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int vls, vsp, old, len; |
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char buf[18]; |
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if (reg >= 1) |
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return -EINVAL; |
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/* tty and write pointers required for talking to the modem |
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* are expected to be set by the line discipline initialization code */ |
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if (!cx20442->tty || !cx20442->tty->ops->write) |
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return -EIO; |
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old = cx20442->reg_cache; |
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cx20442->reg_cache = value; |
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vls = cx20442_pm_to_v253_vls(value); |
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if (vls < 0) |
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return vls; |
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vsp = cx20442_pm_to_v253_vsp(value); |
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if (vsp < 0) |
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return vsp; |
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if ((vls == V253_VLS_T) || |
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(vls == cx20442_pm_to_v253_vls(old))) { |
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if (vsp == cx20442_pm_to_v253_vsp(old)) |
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return 0; |
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len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp); |
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} else if (vsp == cx20442_pm_to_v253_vsp(old)) |
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len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls); |
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else |
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len = snprintf(buf, ARRAY_SIZE(buf), |
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"at+vls=%d;+vsp=%d\r", vls, vsp); |
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if (unlikely(len > (ARRAY_SIZE(buf) - 1))) |
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return -ENOMEM; |
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dev_dbg(component->dev, "%s: %s\n", __func__, buf); |
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if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len) |
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return -EIO; |
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return 0; |
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} |
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/* |
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* Line discpline related code |
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* |
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* Any of the callback functions below can be used in two ways: |
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* 1) registerd by a machine driver as one of line discipline operations, |
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* 2) called from a machine's provided line discipline callback function |
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* in case when extra machine specific code must be run as well. |
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*/ |
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/* Modem init: echo off, digital speaker off, quiet off, voice mode */ |
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static const char *v253_init = "ate0m0q0+fclass=8\r"; |
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/* Line discipline .open() */ |
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static int v253_open(struct tty_struct *tty) |
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{ |
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int ret, len = strlen(v253_init); |
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/* Doesn't make sense without write callback */ |
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if (!tty->ops->write) |
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return -EINVAL; |
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/* Won't work if no codec pointer has been passed by a card driver */ |
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if (!tty->disc_data) |
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return -ENODEV; |
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tty->receive_room = 16; |
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if (tty->ops->write(tty, v253_init, len) != len) { |
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ret = -EIO; |
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goto err; |
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} |
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/* Actual setup will be performed after the modem responds. */ |
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return 0; |
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err: |
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tty->disc_data = NULL; |
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return ret; |
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} |
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/* Line discipline .close() */ |
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static void v253_close(struct tty_struct *tty) |
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{ |
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struct snd_soc_component *component = tty->disc_data; |
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struct cx20442_priv *cx20442; |
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tty->disc_data = NULL; |
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if (!component) |
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return; |
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cx20442 = snd_soc_component_get_drvdata(component); |
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/* Prevent the codec driver from further accessing the modem */ |
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cx20442->tty = NULL; |
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component->card->pop_time = 0; |
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} |
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/* Line discipline .hangup() */ |
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static int v253_hangup(struct tty_struct *tty) |
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{ |
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v253_close(tty); |
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return 0; |
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} |
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/* Line discipline .receive_buf() */ |
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static void v253_receive(struct tty_struct *tty, |
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const unsigned char *cp, char *fp, int count) |
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{ |
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struct snd_soc_component *component = tty->disc_data; |
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struct cx20442_priv *cx20442; |
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if (!component) |
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return; |
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cx20442 = snd_soc_component_get_drvdata(component); |
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if (!cx20442->tty) { |
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/* First modem response, complete setup procedure */ |
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/* Set up codec driver access to modem controls */ |
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cx20442->tty = tty; |
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component->card->pop_time = 1; |
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} |
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} |
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/* Line discipline .write_wakeup() */ |
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static void v253_wakeup(struct tty_struct *tty) |
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{ |
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} |
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struct tty_ldisc_ops v253_ops = { |
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.magic = TTY_LDISC_MAGIC, |
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.name = "cx20442", |
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.owner = THIS_MODULE, |
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.open = v253_open, |
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.close = v253_close, |
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.hangup = v253_hangup, |
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.receive_buf = v253_receive, |
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.write_wakeup = v253_wakeup, |
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}; |
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EXPORT_SYMBOL_GPL(v253_ops); |
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/* |
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* Codec DAI |
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*/ |
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static struct snd_soc_dai_driver cx20442_dai = { |
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.name = "cx20442-voice", |
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.playback = { |
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.stream_name = "Playback", |
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.channels_min = 1, |
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.channels_max = 1, |
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.rates = SNDRV_PCM_RATE_8000, |
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.formats = SNDRV_PCM_FMTBIT_S16_LE, |
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}, |
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.capture = { |
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.stream_name = "Capture", |
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.channels_min = 1, |
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.channels_max = 1, |
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.rates = SNDRV_PCM_RATE_8000, |
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.formats = SNDRV_PCM_FMTBIT_S16_LE, |
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}, |
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}; |
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static int cx20442_set_bias_level(struct snd_soc_component *component, |
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enum snd_soc_bias_level level) |
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{ |
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struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component); |
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int err = 0; |
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switch (level) { |
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case SND_SOC_BIAS_PREPARE: |
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if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_STANDBY) |
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break; |
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if (IS_ERR(cx20442->por)) |
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err = PTR_ERR(cx20442->por); |
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else |
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err = regulator_enable(cx20442->por); |
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break; |
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case SND_SOC_BIAS_STANDBY: |
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if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_PREPARE) |
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break; |
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if (IS_ERR(cx20442->por)) |
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err = PTR_ERR(cx20442->por); |
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else |
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err = regulator_disable(cx20442->por); |
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break; |
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default: |
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break; |
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} |
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return err; |
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} |
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static int cx20442_component_probe(struct snd_soc_component *component) |
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{ |
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struct cx20442_priv *cx20442; |
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cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL); |
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if (cx20442 == NULL) |
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return -ENOMEM; |
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cx20442->por = regulator_get(component->dev, "POR"); |
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if (IS_ERR(cx20442->por)) { |
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int err = PTR_ERR(cx20442->por); |
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dev_warn(component->dev, "failed to get POR supply (%d)", err); |
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/* |
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* When running on a non-dt platform and requested regulator |
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* is not available, regulator_get() never returns |
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* -EPROBE_DEFER as it is not able to justify if the regulator |
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* may still appear later. On the other hand, the board can |
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* still set full constraints flag at late_initcall in order |
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* to instruct regulator_get() to return a dummy one if |
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* sufficient. Hence, if we get -ENODEV here, let's convert |
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* it to -EPROBE_DEFER and wait for the board to decide or |
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* let Deferred Probe infrastructure handle this error. |
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*/ |
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if (err == -ENODEV) |
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err = -EPROBE_DEFER; |
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kfree(cx20442); |
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return err; |
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} |
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cx20442->tty = NULL; |
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snd_soc_component_set_drvdata(component, cx20442); |
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component->card->pop_time = 0; |
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return 0; |
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} |
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/* power down chip */ |
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static void cx20442_component_remove(struct snd_soc_component *component) |
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{ |
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struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component); |
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if (cx20442->tty) { |
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struct tty_struct *tty = cx20442->tty; |
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tty_hangup(tty); |
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} |
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if (!IS_ERR(cx20442->por)) { |
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/* should be already in STANDBY, hence disabled */ |
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regulator_put(cx20442->por); |
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} |
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snd_soc_component_set_drvdata(component, NULL); |
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kfree(cx20442); |
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} |
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static const struct snd_soc_component_driver cx20442_component_dev = { |
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.probe = cx20442_component_probe, |
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.remove = cx20442_component_remove, |
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.set_bias_level = cx20442_set_bias_level, |
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.read = cx20442_read_reg_cache, |
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.write = cx20442_write, |
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.dapm_widgets = cx20442_dapm_widgets, |
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.num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets), |
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.dapm_routes = cx20442_audio_map, |
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.num_dapm_routes = ARRAY_SIZE(cx20442_audio_map), |
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.idle_bias_on = 1, |
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.use_pmdown_time = 1, |
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.endianness = 1, |
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.non_legacy_dai_naming = 1, |
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}; |
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static int cx20442_platform_probe(struct platform_device *pdev) |
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{ |
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return devm_snd_soc_register_component(&pdev->dev, |
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&cx20442_component_dev, &cx20442_dai, 1); |
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} |
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static struct platform_driver cx20442_platform_driver = { |
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.driver = { |
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.name = "cx20442-codec", |
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}, |
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.probe = cx20442_platform_probe, |
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}; |
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module_platform_driver(cx20442_platform_driver); |
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MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver"); |
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MODULE_AUTHOR("Janusz Krzysztofik"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:cx20442-codec");
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