http://blog.csdn.net/mike8825/article/details/69489865?locationnum=3&fps=1
1、DTS相应修改：
DTS相关代码：kernel/arch/arm/boot/dts/qcom/msm8909-qrd-skuc.dtsi：
1 sound { 2 compatible = "qcom,msm8x16-audio-codec"; 3 qcom,model = "msm8909-skuc-snd-card"; 4 qcom,msm-snd-card-id = <0>; 5 qcom,msm-codec-type = "internal"; 6 qcom,msm-ext-pa = "primary"; 7 qcom,msm-mclk-freq = <9600000>; 8 qcom,msm-mbhc-hphl-swh = <0>; //高通平台耳机驱动机制为MBHC，hphl为高通耳机平台的设置，简单的理解就是低电平检测还是高电平检测 9 qcom,msm-mbhc-gnd-swh = <0>; 10 qcom,msm-hs-micbias-type = "internal"; 11 qcom,msm-micbias1-ext-cap; 12 qcom,msm-micbias2-ext-cap; 13 qcom,audio-routing = 14 "RX_BIAS", "MCLK", 15 "SPK_RX_BIAS", "MCLK", 16 "INT_LDO_H", "MCLK", 17 "MIC BIAS Internal1", "Handset Mic", 18 "MIC BIAS Internal2", "Headset Mic", 19 "MIC BIAS Internal3", "Secondary Mic", 20 "AMIC1", "MIC BIAS Internal1", 21 "AMIC2", "MIC BIAS Internal2", 22 "AMIC3", "MIC BIAS Internal3"; 23 pinctrl-names = "cdc_lines_act", 24 "cdc_lines_sus"; 25 pinctrl-0 = <&cdc_pdm_lines_act>; 26 pinctrl-1 = <&cdc_pdm_lines_sus>; 27 asoc-platform = <&pcm0>, <&pcm1>, <&voip>, <&voice>, 28 <&loopback>, <&compress>, <&hostless>, 29 <&afe>, <&lsm>, <&routing>, <&lpa>, 30 <&voice_svc>; 31 asoc-platform-names = "msm-pcm-dsp.0", "msm-pcm-dsp.1", 32 "msm-voip-dsp", "msm-pcm-voice", "msm-pcm-loopback", 33 "msm-compress-dsp", "msm-pcm-hostless", "msm-pcm-afe", 34 "msm-lsm-client", "msm-pcm-routing", "msm-pcm-lpa", 35 "msm-voice-svc"; 36 asoc-cpu = <&dai_pri_auxpcm>, <&dai_hdmi>, 37 <&dai_mi2s0>, <&dai_mi2s1>, <&dai_mi2s2>, <&dai_mi2s3>, 38 <&sb_0_rx>, <&sb_0_tx>, <&sb_1_rx>, <&sb_1_tx>, 39 <&sb_3_rx>, <&sb_3_tx>, <&sb_4_rx>, <&sb_4_tx>, 40 <&bt_sco_rx>, <&bt_sco_tx>, <&int_fm_rx>, <&int_fm_tx>, 41 <&afe_pcm_rx>, <&afe_pcm_tx>, <&afe_proxy_rx>, <&afe_proxy_tx>, 42 <&incall_record_rx>, <&incall_record_tx>, <&incall_music_rx>, 43 <&incall_music_2_rx>; 44 asoc-cpu-names = "msm-dai-q6-auxpcm.1", "msm-dai-q6-hdmi.8", 45 "msm-dai-q6-mi2s.0", "msm-dai-q6-mi2s.1", 46 "msm-dai-q6-mi2s.2", "msm-dai-q6-mi2s.3", 47 "msm-dai-q6-dev.16384", "msm-dai-q6-dev.16385", 48 "msm-dai-q6-dev.16386", "msm-dai-q6-dev.16387", 49 "msm-dai-q6-dev.16390", "msm-dai-q6-dev.16391", 50 "msm-dai-q6-dev.16392", "msm-dai-q6-dev.16393", 51 "msm-dai-q6-dev.12288", "msm-dai-q6-dev.12289", 52 "msm-dai-q6-dev.12292", "msm-dai-q6-dev.12293", 53 "msm-dai-q6-dev.224", "msm-dai-q6-dev.225", 54 "msm-dai-q6-dev.241", "msm-dai-q6-dev.240", 55 "msm-dai-q6-dev.32771", "msm-dai-q6-dev.32772", 56 "msm-dai-q6-dev.32773", "msm-dai-q6-dev.32770"; 57 asoc-codec = <&stub_codec>, <&pm8909_conga_dig>; //在这里使用了pm8909电源管理芯片的codec芯片 58 asoc-codec-names = "msm-stub-codec.1", "tombak_codec"; 59 };
通过find ./ -name "*8909*" | xargs grep -n "pm8909_conga_dig"来搜索关键字：
kernel/arch/arm/boot/dts/qcom/msm-pm8909.dtsi：
pm8909_conga_dig: 8909_wcd_codec@f000 { compatible = "qcom,msm8x16_wcd_codec"; reg = <0xf000 0x100>; interrupt-parent = <&spmi_bus>; interrupts = <0x1 0xf0 0x0>, <0x1 0xf0 0x1>, <0x1 0xf0 0x2>, <0x1 0xf0 0x3>, <0x1 0xf0 0x4>, <0x1 0xf0 0x5>, <0x1 0xf0 0x6>, <0x1 0xf0 0x7>; interrupt-names = "spk_cnp_int", "spk_clip_int", "spk_ocp_int", "ins_rem_det1", "but_rel_det", "but_press_det", "ins_rem_det", "mbhc_int"; cdc-vdda-cp-supply = <&pm8909_s2>; qcom,cdc-vdda-cp-voltage = <1800000 2200000>; qcom,cdc-vdda-cp-current = <500000>; cdc-vdda-h-supply = <&pm8909_l5>; qcom,cdc-vdda-h-voltage = <1800000 1800000>; qcom,cdc-vdda-h-current = <10000>; cdc-vdd-px-supply = <&pm8909_l5>; qcom,cdc-vdd-px-voltage = <1800000 1800000>; qcom,cdc-vdd-px-current = <5000>; cdc-vdd-pa-supply = <&pm8909_s2>; qcom,cdc-vdd-pa-voltage = <1800000 2200000>; qcom,cdc-vdd-pa-current = <260000>; cdc-vdd-mic-bias-supply = <&pm8909_l13>; qcom,cdc-vdd-mic-bias-voltage = <3075000 3075000>; qcom,cdc-vdd-mic-bias-current = <5000>; qcom,cdc-mclk-clk-rate = <9600000>; qcom,cdc-static-supplies = "cdc-vdda-h", "cdc-vdd-px", "cdc-vdd-pa", "cdc-vdda-cp"; qcom,cdc-on-demand-supplies = "cdc-vdd-mic-bias"; }; pm8909_conga_analog: 8909_wcd_codec@f100 { compatible = "qcom,msm8x16_wcd_codec"; reg = <0xf100 0x100>; interrupt-parent = <&spmi_bus>; interrupts = <0x1 0xf1 0x0>, <0x1 0xf1 0x1>, <0x1 0xf1 0x2>, <0x1 0xf1 0x3>, <0x1 0xf1 0x4>, <0x1 0xf1 0x5>; interrupt-names = "ear_ocp_int", "hphr_ocp_int", "hphl_ocp_det", "ear_cnp_int", "hphr_cnp_int", "hphl_cnp_int"; };
msm8909的耳机接口在pm8909上，耳机检测脚是HS_DET。
确定自己的插座是NO还是NC的，详情查看博客：http://www.cnblogs.com/linhaostudy/p/8260813.html
通过检查，判断JACK为NO状态；根据高通bring up 手册更改相应的DTSI：
1 qcom,msm-mbhc-hphl-swh = <1>; //由0改为1
2、kernel分析：
kernel/sound/soc/codecs/msm8x16-wcd.c
1 static const struct wcd_mbhc_intr intr_ids = { 2 .mbhc_sw_intr = MSM8X16_WCD_IRQ_MBHC_HS_DET, 3 .mbhc_btn_press_intr = MSM8X16_WCD_IRQ_MBHC_PRESS, 4 .mbhc_btn_release_intr = MSM8X16_WCD_IRQ_MBHC_RELEASE, 5 .mbhc_hs_ins_intr = MSM8X16_WCD_IRQ_MBHC_INSREM_DET1, 6 .mbhc_hs_rem_intr = MSM8X16_WCD_IRQ_MBHC_INSREM_DET, 7 .hph_left_ocp = MSM8X16_WCD_IRQ_HPHL_OCP, 8 .hph_right_ocp = MSM8X16_WCD_IRQ_HPHR_OCP, 9 };
这个结构体描述了msm8909的wcdx系列的codec芯片的MBHC的信息；
1 static int msm8x16_wcd_codec_probe(struct snd_soc_codec *codec) 2 { 3 struct msm8x16_wcd_priv *msm8x16_wcd_priv; 4 struct msm8x16_wcd *msm8x16_wcd; 5 int i, ret; 6 7 dev_dbg(codec->dev, "%s()\n", __func__); 8 9 msm8x16_wcd_priv = kzalloc(sizeof(struct msm8x16_wcd_priv), GFP_KERNEL); 10 if (!msm8x16_wcd_priv) { 11 dev_err(codec->dev, "Failed to allocate private data\n"); 12 return -ENOMEM; 13 } 14 15 for (i = 0; i < NUM_DECIMATORS; i++) { 16 tx_hpf_work[i].msm8x16_wcd = msm8x16_wcd_priv; 17 tx_hpf_work[i].decimator = i + 1; 18 INIT_DELAYED_WORK(&tx_hpf_work[i].dwork, 19 tx_hpf_corner_freq_callback); 20 } 21 22 codec->control_data = dev_get_drvdata(codec->dev); 23 snd_soc_codec_set_drvdata(codec, msm8x16_wcd_priv); 24 msm8x16_wcd_priv->codec = codec; 25 26 /* codec resmgr module init */ 27 msm8x16_wcd = codec->control_data; 28 msm8x16_wcd->dig_base = ioremap(MSM8X16_DIGITAL_CODEC_BASE_ADDR, 29 MSM8X16_DIGITAL_CODEC_REG_SIZE); 30 if (msm8x16_wcd->dig_base == NULL) { 31 dev_err(codec->dev, "%s ioremap failed\n", __func__); 32 kfree(msm8x16_wcd_priv); 33 return -ENOMEM; 34 } 35 msm8x16_wcd_priv->spkdrv_reg = 36 wcd8x16_wcd_codec_find_regulator(codec->control_data, 37 MSM89XX_VDD_SPKDRV_NAME); 38 msm8x16_wcd_priv->pmic_rev = snd_soc_read(codec, 39 MSM8X16_WCD_A_DIGITAL_REVISION1); 40 msm8x16_wcd_priv->codec_version = snd_soc_read(codec, 41 MSM8X16_WCD_A_DIGITAL_PERPH_SUBTYPE); 42 if (msm8x16_wcd_priv->codec_version == CONGA) { 43 dev_dbg(codec->dev, "%s :Conga REV: %d\n", __func__, 44 msm8x16_wcd_priv->codec_version); 45 msm8x16_wcd_priv->ext_spk_boost_set = true; 46 } else { 47 dev_dbg(codec->dev, "%s :PMIC REV: %d\n", __func__, 48 msm8x16_wcd_priv->pmic_rev); 49 } 50 /* 51 * set to default boost option BOOST_SWITCH, user mixer path can change 52 * it to BOOST_ALWAYS or BOOST_BYPASS based on solution chosen. 53 */ 54 msm8x16_wcd_priv->boost_option = BOOST_SWITCH; 55 msm8x16_wcd_dt_parse_boost_info(codec); // 56 msm8x16_wcd_set_boost_v(codec); 57 58 snd_soc_add_codec_controls(codec, impedance_detect_controls, 59 ARRAY_SIZE(impedance_detect_controls)); 60 61 msm8x16_wcd_bringup(codec); 62 msm8x16_wcd_codec_init_reg(codec); 63 msm8x16_wcd_update_reg_defaults(codec); 64 65 wcd9xxx_spmi_set_codec(codec); 66 67 msm8x16_wcd_priv->on_demand_list[ON_DEMAND_MICBIAS].supply = 68 wcd8x16_wcd_codec_find_regulator( 69 codec->control_data, 70 on_demand_supply_name[ON_DEMAND_MICBIAS]); 71 atomic_set(&msm8x16_wcd_priv->on_demand_list[ON_DEMAND_MICBIAS].ref, 0); 72 73 BLOCKING_INIT_NOTIFIER_HEAD(&msm8x16_wcd_priv->notifier); 74 75 msm8x16_wcd_priv->fw_data = kzalloc(sizeof(*(msm8x16_wcd_priv->fw_data)) 76 , GFP_KERNEL); 77 if (!msm8x16_wcd_priv->fw_data) { 78 dev_err(codec->dev, "Failed to allocate fw_data\n"); 79 iounmap(msm8x16_wcd->dig_base); 80 kfree(msm8x16_wcd_priv); 81 return -ENOMEM; 82 } 83 84 set_bit(WCD9XXX_MBHC_CAL, msm8x16_wcd_priv->fw_data->cal_bit); 85 ret = wcd_cal_create_hwdep(msm8x16_wcd_priv->fw_data, 86 WCD9XXX_CODEC_HWDEP_NODE, codec); 87 if (ret < 0) { 88 dev_err(codec->dev, "%s hwdep failed %d\n", __func__, ret); 89 iounmap(msm8x16_wcd->dig_base); 90 kfree(msm8x16_wcd_priv->fw_data); 91 kfree(msm8x16_wcd_priv); 92 return ret; 93 } 94 95 wcd_mbhc_init(&msm8x16_wcd_priv->mbhc, codec, &mbhc_cb, &intr_ids, 96 true); //在这里处理相应耳机的相应信息 97 98 msm8x16_wcd_priv->mclk_enabled = false; 99 msm8x16_wcd_priv->clock_active = false; 100 msm8x16_wcd_priv->config_mode_active = false; 101 102 /* Set initial MICBIAS voltage level */ 103 msm8x16_wcd_set_micb_v(codec); 104 105 /* Set initial cap mode */ 106 msm8x16_wcd_configure_cap(codec, false, false); 107 registered_codec = codec; 108 modem_state_notifier = 109 subsys_notif_register_notifier("modem", 110 &modem_state_notifier_block); 111 if (!modem_state_notifier) { 112 dev_err(codec->dev, "Failed to register modem state notifier\n" 113 ); 114 iounmap(msm8x16_wcd->dig_base); 115 kfree(msm8x16_wcd_priv->fw_data); 116 kfree(msm8x16_wcd_priv); 117 registered_codec = NULL; 118 return -ENOMEM; 119 } 120 return 0; 121 }
来到kernel/sound/soc/codecs/wcd-mbhc-v2.c：
1 int wcd_mbhc_init(struct wcd_mbhc *mbhc, struct snd_soc_codec *codec,
2 const struct wcd_mbhc_cb *mbhc_cb,
3 const struct wcd_mbhc_intr *mbhc_cdc_intr_ids,
4 bool impedance_det_en)
5 {
6 int ret = 0;
7 int hph_swh = 0;
8 int gnd_swh = 0;
9 struct snd_soc_card *card = codec->card;
10 const char *hph_switch = "qcom,msm-mbhc-hphl-swh";
11 const char *gnd_switch = "qcom,msm-mbhc-gnd-swh";
12 const char *ext1_cap = "qcom,msm-micbias1-ext-cap";
13 const char *ext2_cap = "qcom,msm-micbias2-ext-cap";
14
15 pr_debug("%s: enter\n", __func__);
16
17 ret = of_property_read_u32(card->dev->of_node, hph_switch, &hph_swh); //在这里找到设备树信息，通过高低电平判断no或者nc的jack
18 if (ret) {
19 dev_err(card->dev,
20 "%s: missing %s in dt node\n", __func__, hph_switch);
21 goto err;
22 }
23
24 ret = of_property_read_u32(card->dev->of_node, gnd_switch, &gnd_swh);
25 if (ret) {
26 dev_err(card->dev,
27 "%s: missing %s in dt node\n", __func__, gnd_switch);
28 goto err;
29 }
30 mbhc->micbias1_cap_mode =
31 (of_property_read_bool(card->dev->of_node, ext1_cap) ?
32 MICBIAS_EXT_BYP_CAP : MICBIAS_NO_EXT_BYP_CAP);
33
34 mbhc->micbias2_cap_mode =
35 (of_property_read_bool(card->dev->of_node, ext2_cap) ?
36 MICBIAS_EXT_BYP_CAP : MICBIAS_NO_EXT_BYP_CAP);
37
38 mbhc->in_swch_irq_handler = false;
39 mbhc->current_plug = MBHC_PLUG_TYPE_NONE;
40 mbhc->is_btn_press = false;
41 mbhc->codec = codec;
42 mbhc->intr_ids = mbhc_cdc_intr_ids;
43 mbhc->impedance_detect = impedance_det_en;
44 mbhc->hphl_swh = hph_swh;
45 mbhc->gnd_swh = gnd_swh;
46 mbhc->micbias_enable = false;
47 mbhc->mbhc_cb = mbhc_cb;
48 mbhc->btn_press_intr = false;
49
50 if (mbhc->intr_ids == NULL) {
51 pr_err("%s: Interrupt mapping not provided\n", __func__);
52 return -EINVAL;
53 }
54
55 if (mbhc->headset_jack.jack == NULL) {
56 ret = snd_soc_jack_new(codec, "Headset Jack",
57 WCD_MBHC_JACK_MASK, &mbhc->headset_jack); //通过snd_soc_jack_new()函数新建一个新的jack，将该jack指向Machine对应的CODEC，使该jack与CODEC建立联系。snd_soc_jack_new -》snd_jack_new -》 snd_device_new - 》 snd_jack_dev_register -》
err = input_register_device(jack->input_dev); //最终注册input设备
58 if (ret) {
59 pr_err("%s: Failed to create new jack\n", __func__);
60 return ret;
61 }
62
63 ret = snd_soc_jack_new(codec, "Button Jack",
64 WCD_MBHC_JACK_BUTTON_MASK,
65 &mbhc->button_jack);
66 if (ret) {
67 pr_err("Failed to create new jack\n");
68 return ret;
69 }
70
71 ret = snd_jack_set_key(mbhc->button_jack.jack,
72 SND_JACK_BTN_0,
73 KEY_MEDIA);
74 if (ret) {
75 pr_err("%s: Failed to set code for btn-0\n",
76 __func__);
77 return ret;
78 }
79
80 INIT_DELAYED_WORK(&mbhc->mbhc_btn_dwork, wcd_btn_lpress_fn);
81 }
82
83 /* Register event notifier */
84 mbhc->nblock.notifier_call = wcd_event_notify;
85 ret = msm8x16_register_notifier(codec, &mbhc->nblock);
86 if (ret) {
87 pr_err("%s: Failed to register notifier %d\n", __func__, ret);
88 return ret;
89 }
90
91 init_waitqueue_head(&mbhc->wait_btn_press);
92 mutex_init(&mbhc->codec_resource_lock);
93 //初测耳机插拔中断
94 ret = wcd9xxx_spmi_request_irq(mbhc->intr_ids->mbhc_sw_intr,
95 wcd_mbhc_mech_plug_detect_irq,
96 "mbhc sw intr", mbhc);
97 if (ret) {
98 pr_err("%s: Failed to request irq %d, ret = %d\n", __func__,
99 mbhc->intr_ids->mbhc_sw_intr, ret);
100 goto err_mbhc_sw_irq;
101 }
102 //申请耳机按下的中断
103 ret = wcd9xxx_spmi_request_irq(mbhc->intr_ids->mbhc_btn_press_intr,
104 wcd_mbhc_btn_press_handler,
105 "Button Press detect",
106 mbhc);
107 if (ret) {
108 pr_err("%s: Failed to request irq %d\n", __func__,
109 mbhc->intr_ids->mbhc_btn_press_intr);
110 goto err_btn_press_irq;
111 }
112
113 ret = wcd9xxx_spmi_request_irq(mbhc->intr_ids->mbhc_btn_release_intr,
114 wcd_mbhc_release_handler,
115 "Button Release detect", mbhc);
116 if (ret) {
117 pr_err("%s: Failed to request irq %d\n", __func__,
118 mbhc->intr_ids->mbhc_btn_release_intr);
119 goto err_btn_release_irq;
120 }
121 //这个应该是注册检测高阻抗的耳机延长线设备的插入中断
122 ret = wcd9xxx_spmi_request_irq(mbhc->intr_ids->mbhc_hs_ins_intr,
123 wcd_mbhc_hs_ins_irq, //耳机插入监测函数
124 "Elect Insert", mbhc);
125 if (ret) {
126 pr_err("%s: Failed to request irq %d\n", __func__,
127 mbhc->intr_ids->mbhc_hs_ins_intr);
128 goto err_mbhc_hs_ins_irq;
129 }
130 wcd9xxx_spmi_disable_irq(mbhc->intr_ids->mbhc_hs_ins_intr);
131 //这个应该是注册检测高阻抗的耳机延长线设备的拔出中断
132 ret = wcd9xxx_spmi_request_irq(mbhc->intr_ids->mbhc_hs_rem_intr,
133 wcd_mbhc_hs_rem_irq,
134 "Elect Remove", mbhc);
135 if (ret) {
136 pr_err("%s: Failed to request irq %d\n", __func__,
137 mbhc->intr_ids->mbhc_hs_rem_intr);
138 goto err_mbhc_hs_rem_irq;
139 }
140 wcd9xxx_spmi_disable_irq(mbhc->intr_ids->mbhc_hs_rem_intr);
141
142 ret = wcd9xxx_spmi_request_irq(mbhc->intr_ids->hph_left_ocp,
143 wcd_mbhc_hphl_ocp_irq, "HPH_L OCP detect",
144 mbhc);
145 if (ret) {
146 pr_err("%s: Failed to request irq %d\n", __func__,
147 mbhc->intr_ids->hph_left_ocp);
148 goto err_hphl_ocp_irq;
149 }
150
151 ret = wcd9xxx_spmi_request_irq(mbhc->intr_ids->hph_right_ocp,
152 wcd_mbhc_hphr_ocp_irq, "HPH_R OCP detect",
153 mbhc);
154 if (ret) {
155 pr_err("%s: Failed to request irq %d\n", __func__,
156 mbhc->intr_ids->hph_right_ocp);
157 goto err_hphr_ocp_irq;
158 }
159
160 pr_debug("%s: leave ret %d\n", __func__, ret);
161 return ret;
162
163 err_hphr_ocp_irq:
164 wcd9xxx_spmi_free_irq(mbhc->intr_ids->hph_left_ocp, mbhc);
165 err_hphl_ocp_irq:
166 wcd9xxx_spmi_free_irq(mbhc->intr_ids->mbhc_hs_rem_intr, mbhc);
167 err_mbhc_hs_rem_irq:
168 wcd9xxx_spmi_free_irq(mbhc->intr_ids->mbhc_hs_ins_intr, mbhc);
169 err_mbhc_hs_ins_irq:
170 wcd9xxx_spmi_free_irq(mbhc->intr_ids->mbhc_btn_release_intr, mbhc);
171 err_btn_release_irq:
172 wcd9xxx_spmi_free_irq(mbhc->intr_ids->mbhc_btn_press_intr, mbhc);
173 err_btn_press_irq:
174 wcd9xxx_spmi_free_irq(mbhc->intr_ids->mbhc_sw_intr, mbhc);
175 err_mbhc_sw_irq:
176 msm8x16_unregister_notifier(codec, &mbhc->nblock);
177 mutex_destroy(&mbhc->codec_resource_lock);
178 err:
179 pr_debug("%s: leave ret %d\n", __func__, ret);
180 return ret;
181 }
1 static irqreturn_t wcd_mbhc_mech_plug_detect_irq(int irq, void *data) 2 { 3 int r = IRQ_HANDLED; 4 struct wcd_mbhc *mbhc = data; 5 6 pr_debug("%s: enter\n", __func__); 7 if (unlikely(wcd9xxx_spmi_lock_sleep() == false)) { 8 pr_warn("%s: failed to hold suspend\n", __func__); 9 r = IRQ_NONE; 10 } else { 11 /* Call handler */ 12 wcd_mbhc_swch_irq_handler(mbhc); //中断函数中的接口，负责处理相应的 13 wcd9xxx_spmi_unlock_sleep(); 14 } 15 pr_debug("%s: leave %d\n", __func__, r); 16 return r; 17 }
//初始化函数，主要注册了耳机插拔和耳机按键的input设备，注册了耳机四个按键的键值，注册了一系列的中断，我们先看看其中比较重要的三个中断，耳机插入中断和按键按下松开中断。
1 static void wcd_mbhc_swch_irq_handler(struct wcd_mbhc *mbhc) 2 { 3 bool detection_type; 4 bool micbias1; 5 struct snd_soc_codec *codec = mbhc->codec; 6 pr_debug("%s: enter\n", __func__); 7 8 WCD_MBHC_RSC_LOCK(mbhc); 9 10 mbhc->in_swch_irq_handler = true; 11 12 /* cancel pending button press, 如果有耳机按键任务在运行，去掉掉该任务*/ */ 13 if (wcd_cancel_btn_work(mbhc)) 14 pr_debug("%s: button press is canceled\n", __func__); 15 /*读取当前的检测类型，如果detection_type = 1, 是指当前为插入，检测插入耳机类型，如果为0，表示当前拔出*/ 16 detection_type = (snd_soc_read(codec, 17 MSM8X16_WCD_A_ANALOG_MBHC_DET_CTL_1)) & 0x20; 18 19 /* Set the detection type appropriately */ 20 snd_soc_update_bits(codec, MSM8X16_WCD_A_ANALOG_MBHC_DET_CTL_1, 21 0x20, (!detection_type << 5)); 22 23 pr_debug("%s: mbhc->current_plug: %d detection_type: %d\n", __func__, 24 mbhc->current_plug, detection_type); 25 wcd_cancel_hs_detect_plug(mbhc, &mbhc->correct_plug_swch); 26 /*如果当前是检测耳机插入， 就进行耳机插入的检测*/ 27 micbias1 = (snd_soc_read(codec, MSM8X16_WCD_A_ANALOG_MICB_1_EN) & 0x80); 28 if ((mbhc->current_plug == MBHC_PLUG_TYPE_NONE) && 29 detection_type) { 30 /* Make sure MASTER_BIAS_CTL is enabled *//*下面是使能一系列的micbias相关的寄存器，把micbias2使能*/ 31 snd_soc_update_bits(codec, 32 MSM8X16_WCD_A_ANALOG_MASTER_BIAS_CTL, 33 0x30, 0x30); 34 snd_soc_update_bits(codec, 35 MSM8X16_WCD_A_ANALOG_MICB_1_EN, 36 0x04, 0x04); 37 if (!mbhc->mbhc_cfg->hs_ext_micbias) 38 /* Enable Tx2 RBias if the headset 39 * is using internal micbias*/ 40 snd_soc_update_bits(codec, 41 MSM8X16_WCD_A_ANALOG_MICB_1_INT_RBIAS, 42 0x10, 0x10); 43 /* Remove pull down on MIC BIAS2 */ 44 snd_soc_update_bits(codec, 45 MSM8X16_WCD_A_ANALOG_MICB_2_EN, 46 0x20, 0x00); 47 /* Enable HW FSM */ 48 snd_soc_update_bits(codec, 49 MSM8X16_WCD_A_ANALOG_MBHC_FSM_CTL, 50 0x80, 0x80); 51 /* Apply trim if needed on the device */ 52 if (mbhc->mbhc_cb && mbhc->mbhc_cb->trim_btn_reg) 53 mbhc->mbhc_cb->trim_btn_reg(codec); 54 /* Enable external voltage source to micbias if present */ /*如果micbias电压是外供的，这里把它使能*/ 55 if (mbhc->mbhc_cb && mbhc->mbhc_cb->enable_mb_source) 56 mbhc->mbhc_cb->enable_mb_source(codec, true); 57 mbhc->btn_press_intr = false; 58 wcd_mbhc_detect_plug_type(mbhc);
/*下面是检测耳机拔出，耳机拔出后，关闭micbias电压， 上报耳机拔出事件*/ 59 } else if ((mbhc->current_plug != MBHC_PLUG_TYPE_NONE) 60 && !detection_type) { 61 /* Disable external voltage source to micbias if present */ 62 if (mbhc->mbhc_cb && mbhc->mbhc_cb->enable_mb_source) 63 mbhc->mbhc_cb->enable_mb_source(codec, false); 64 /* Disable HW FSM */ 65 snd_soc_update_bits(codec, 66 MSM8X16_WCD_A_ANALOG_MBHC_FSM_CTL, 67 0xB0, 0x00); 68 snd_soc_update_bits(codec, 69 MSM8X16_WCD_A_ANALOG_MICB_1_EN, 70 0x04, 0x00); 71 if (mbhc->mbhc_cb && mbhc->mbhc_cb->set_cap_mode) 72 mbhc->mbhc_cb->set_cap_mode(codec, micbias1, false); 73 mbhc->btn_press_intr = false; 74 if (mbhc->current_plug == MBHC_PLUG_TYPE_HEADPHONE) { //如果判断是headphone，上报数据； 75 wcd_mbhc_report_plug(mbhc, 0, SND_JACK_HEADPHONE); 76 } else if (mbhc->current_plug == MBHC_PLUG_TYPE_GND_MIC_SWAP) { 77 wcd_mbhc_report_plug(mbhc, 0, SND_JACK_UNSUPPORTED); 78 } else if (mbhc->current_plug == MBHC_PLUG_TYPE_HEADSET) { 79 /* make sure to turn off Rbias */ 80 snd_soc_update_bits(codec, 81 MSM8X16_WCD_A_ANALOG_MICB_1_INT_RBIAS, 82 0x18, 0x08); 83 snd_soc_update_bits(codec, 84 MSM8X16_WCD_A_ANALOG_MICB_2_EN, 85 0x20, 0x20); 86 wcd9xxx_spmi_disable_irq( 87 mbhc->intr_ids->mbhc_hs_rem_intr); 88 wcd9xxx_spmi_disable_irq( 89 mbhc->intr_ids->mbhc_hs_ins_intr); 90 snd_soc_update_bits(codec, 91 MSM8X16_WCD_A_ANALOG_MBHC_DET_CTL_1, 92 0x01, 0x01); 93 snd_soc_update_bits(codec, 94 MSM8X16_WCD_A_ANALOG_MBHC_DET_CTL_2, 95 0x06, 0x00); 96 wcd_mbhc_report_plug(mbhc, 0, SND_JACK_HEADSET);
/*如果当前是耳机延长线设备拔出，就关闭相关的中断检测，上报LINEOUT设备拔出事件*/ 97 } else if (mbhc->current_plug == MBHC_PLUG_TYPE_HIGH_HPH) { 98 mbhc->is_extn_cable = false; 99 wcd9xxx_spmi_disable_irq( 100 mbhc->intr_ids->mbhc_hs_rem_intr); 101 wcd9xxx_spmi_disable_irq( 102 mbhc->intr_ids->mbhc_hs_ins_intr); 103 snd_soc_update_bits(codec, 104 MSM8X16_WCD_A_ANALOG_MBHC_DET_CTL_1, 105 0x01, 0x01); 106 snd_soc_update_bits(codec, 107 MSM8X16_WCD_A_ANALOG_MBHC_DET_CTL_2, 108 0x06, 0x00); 109 wcd_mbhc_report_plug(mbhc, 0, SND_JACK_LINEOUT); 110 } 111 } else if (!detection_type) { 112 /* Disable external voltage source to micbias if present */ 113 if (mbhc->mbhc_cb && mbhc->mbhc_cb->enable_mb_source) 114 mbhc->mbhc_cb->enable_mb_source(codec, false); 115 /* Disable HW FSM */ 116 snd_soc_update_bits(codec, 117 MSM8X16_WCD_A_ANALOG_MBHC_FSM_CTL, 118 0xB0, 0x00); 119 } 120 121 mbhc->in_swch_irq_handler = false; 122 WCD_MBHC_RSC_UNLOCK(mbhc); 123 pr_debug("%s: leave\n", __func__); 124 }
经过一系列的检测，判断是headset,headphones等，如果是headphones，最终通过wcd_mbhc_jack_report将数据汇报上去。
1 static void wcd_mbhc_report_plug(struct wcd_mbhc *mbhc, int insertion, 2 enum snd_jack_types jack_type) 3 { 4 struct snd_soc_codec *codec = mbhc->codec; 5 WCD_MBHC_RSC_ASSERT_LOCKED(mbhc); 6 7 pr_debug("%s: enter insertion %d hph_status %x\n", 8 __func__, insertion, mbhc->hph_status); 9 if (!insertion) { 10 /* Report removal */ 11 mbhc->hph_status &= ~jack_type; 12 /* 13 * cancel possibly scheduled btn work and 14 * report release if we reported button press 15 */ 16 if (wcd_cancel_btn_work(mbhc)) { 17 pr_debug("%s: button press is canceled\n", __func__); 18 } else if (mbhc->buttons_pressed) { 19 pr_debug("%s: release of button press%d\n", 20 __func__, jack_type); 21 wcd_mbhc_jack_report(mbhc, &mbhc->button_jack, 0, 22 mbhc->buttons_pressed); 23 mbhc->buttons_pressed &= 24 ~WCD_MBHC_JACK_BUTTON_MASK; 25 } 26 27 if (mbhc->micbias_enable) 28 mbhc->micbias_enable = false; 29 30 mbhc->zl = mbhc->zr = 0; 31 mbhc->is_hs_inserted = false; 32 pr_debug("%s: Reporting removal %d(%x)\n", __func__, 33 jack_type, mbhc->hph_status); 34 wcd_mbhc_jack_report(mbhc, &mbhc->headset_jack, 35 mbhc->hph_status, WCD_MBHC_JACK_MASK); 36 wcd_mbhc_set_and_turnoff_hph_padac(mbhc); 37 hphrocp_off_report(mbhc, SND_JACK_OC_HPHR); 38 hphlocp_off_report(mbhc, SND_JACK_OC_HPHL); 39 mbhc->current_plug = MBHC_PLUG_TYPE_NONE; 40 } else { 41 /* 42 * Report removal of current jack type. 43 * Headphone to headset shouldn't report headphone 44 * removal. 45 */ 46 if (mbhc->mbhc_cfg->detect_extn_cable && 47 (mbhc->current_plug == MBHC_PLUG_TYPE_HIGH_HPH || 48 jack_type == SND_JACK_LINEOUT) && 49 (mbhc->hph_status && mbhc->hph_status != jack_type)) { 50 51 if (mbhc->micbias_enable) 52 mbhc->micbias_enable = false; 53 54 mbhc->zl = mbhc->zr = 0; 55 mbhc->is_hs_inserted = false; 56 pr_debug("%s: Reporting removal (%x)\n", 57 __func__, mbhc->hph_status); 58 wcd_mbhc_jack_report(mbhc, &mbhc->headset_jack, 59 0, WCD_MBHC_JACK_MASK); 60 61 if (mbhc->hph_status == SND_JACK_LINEOUT) { 62 63 pr_debug("%s: Enable micbias\n", __func__); 64 /* Disable current source and enable micbias */ 65 snd_soc_update_bits(codec, 66 MSM8X16_WCD_A_ANALOG_MBHC_FSM_CTL, 67 0xB0, 0x80); 68 snd_soc_update_bits(codec, 69 MSM8X16_WCD_A_ANALOG_MICB_2_EN, 70 0x80, 0x80); 71 72 pr_debug("%s: set up elec removal detection\n", 73 __func__); 74 snd_soc_update_bits(codec, 75 MSM8X16_WCD_A_ANALOG_MBHC_DET_CTL_1, 76 0x01, 0x00); 77 usleep_range(200, 210); 78 wcd9xxx_spmi_enable_irq( 79 mbhc->intr_ids->mbhc_hs_rem_intr); 80 } 81 mbhc->hph_status &= ~(SND_JACK_HEADSET | 82 SND_JACK_LINEOUT | 83 SND_JACK_UNSUPPORTED); 84 } 85 86 if (mbhc->current_plug == MBHC_PLUG_TYPE_HEADSET && 87 jack_type == SND_JACK_HEADPHONE) 88 mbhc->hph_status &= ~SND_JACK_HEADSET; 89 90 /* Report insertion */ 91 mbhc->hph_status |= jack_type; 92 93 if (jack_type == SND_JACK_HEADPHONE) 94 mbhc->current_plug = MBHC_PLUG_TYPE_HEADPHONE; 95 else if (jack_type == SND_JACK_UNSUPPORTED) 96 mbhc->current_plug = MBHC_PLUG_TYPE_GND_MIC_SWAP; 97 else if (jack_type == SND_JACK_HEADSET) { 98 mbhc->current_plug = MBHC_PLUG_TYPE_HEADSET; 99 mbhc->jiffies_atreport = jiffies; 100 } 101 else if (jack_type == SND_JACK_LINEOUT) 102 mbhc->current_plug = MBHC_PLUG_TYPE_HIGH_HPH; 103 104 if (mbhc->impedance_detect) 105 wcd_mbhc_calc_impedance(mbhc, 106 &mbhc->zl, &mbhc->zr); 107 mbhc->is_hs_inserted = true; 108 pr_debug("%s: Reporting insertion %d(%x)\n", __func__, 109 jack_type, mbhc->hph_status); 110 wcd_mbhc_jack_report(mbhc, &mbhc->headset_jack, 111 mbhc->hph_status, WCD_MBHC_JACK_MASK); 112 wcd_mbhc_clr_and_turnon_hph_padac(mbhc); 113 } 114 pr_debug("%s: leave hph_status %x\n", __func__, mbhc->hph_status); 115 }
1 static void wcd_mbhc_jack_report(struct wcd_mbhc *mbhc, 2 struct snd_soc_jack *jack, int status, int mask) 3 { 4 snd_soc_jack_report_no_dapm(jack, status, mask); 5 }
1 void snd_soc_jack_report_no_dapm(struct snd_soc_jack *jack, int status, 2 int mask) 3 { 4 jack->status &= ~mask; 5 jack->status |= status & mask; 6 7 snd_jack_report(jack->jack, jack->status); 8 } 9 EXPORT_SYMBOL_GPL(snd_soc_jack_report_no_dapm);
1 void snd_jack_report(struct snd_jack *jack, int status) 2 { 3 int i; 4 5 if (!jack) 6 return; 7 8 for (i = 0; i < ARRAY_SIZE(jack->key); i++) { 9 int testbit = SND_JACK_BTN_0 >> i; 10 11 if (jack->type & testbit) 12 input_report_key(jack->input_dev, jack->key[i], 13 status & testbit); 14 } 15 16 for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) { 17 int testbit = 1 << i; 18 if (jack->type & testbit) 19 input_report_switch(jack->input_dev, 20 jack_switch_types[i], 21 status & testbit); 22 } 23 24 input_sync(jack->input_dev); //上报键值 25 } 26 EXPORT_SYMBOL(snd_jack_report);
最终汇报上去的有效数据是5 6 1 (插头类型 耳机信号 值插入)
0 0 0（同步）
插入的时候：
拔出的时候：
然后也可以根据高通文档判断是否是handset还是handphone：
高通是通过申请为/dev/input/event事件来确定的；
handset插入事件：
handset拔出事件：
