此篇博文只记录移植的步骤,其他不做分析。首先上一张wm8960的硬件连接图:
1 上电操作
配置wm8960的上电脚,文件位置:arch/arm/mach-mx6/board-mx6q_sabresd.c
#define SABRESD_CODEC_PWR_EN IMX_GPIO_NR(7, 12)
440 /* Enable wm8960 power supply */
441 gpio_request(SABRESD_CODEC_PWR_EN, "audio-power");
442 gpio_direction_output(SABRESD_CODEC_PWR_EN, 1);
443 msleep(1);
444 gpio_set_value(SABRESD_CODEC_PWR_EN, 1);
445 printk("Power up wm8960 successful %s\n", __FUNCTION__);
另外,根据原理图可知上电脚为GPIO17,所以相关配置头文件里需将其配置为gpio口,文件位置:arch/arm/mach-mx6/board-mx6dl_sabresd.h
236 /* CODEC_PWR_EN */
237 MX6DL_PAD_GPIO_17__GPIO_7_12,
2:配置I2C,用于client的生成
,文件位置:arch/arm/mach-mx6/board-mx6q_sabresd.c 需确认你的i2c是接的哪个控制器。
805 static struct i2c_board_info mxc_i2c0_board_info[] __initdata = {
806 {
807 I2C_BOARD_INFO("wm8960", 0x1a),
808 },
};
3: 修改wm8960 codec相关的数据结构,此处根据wm8962修改而来,文件位置:
arch/arm/mach-mx6/board-mx6q_sabresd.c
以下是修改的地方
57 #include
58 #include
...省略部分内容...
410 static struct platform_device mx6_sabresd_audio_wm8960_device = {
411 .name = "imx-wm8960",
412 };
413
414 static struct mxc_audio_platform_data wm8960_data;
415
416 static int wm8960_clk_enable(int enable)
417 {
418 if (enable) {
419 clk_enable(clko);
420 printk("%s:wm clk enable\n", __FUNCTION__);
421 }
422 else {
423 clk_disable(clko);
424 printk("%s:wm clk disable\n", __FUNCTION__);
425 }
426 return 0;
427 }
428
429 static int mxc_wm8960_init(void)
430 {
431 int rate;
432
433 clko = clk_get(NULL, "clko_clk");
434 if (IS_ERR(clko)) {
435 pr_err("can't get CLKO clock.\n");
436 return PTR_ERR(clko);
437 }
438 /* both audio codec and comera use CLKO clk*/
439 rate = clk_round_rate(clko, 24000000);
440 clk_set_rate(clko, rate);
441
442 wm8960_data.sysclk = rate;
443
444 /* Enable wm8960 power supply */
445 gpio_request(SABRESD_CODEC_PWR_EN, "audio-power");
446 gpio_direction_output(SABRESD_CODEC_PWR_EN, 1);
447 msleep(1);
448 gpio_set_value(SABRESD_CODEC_PWR_EN, 1);
449 printk("%s:Power up wm8960 successful\n", __FUNCTION__);
450
451 return 0;
452 }
453
454 /* Note: we use struct wm8962_pdata for wm8960_config_data */
455 /* struct wm8962_pdata defind at linux/wm8962.h */
456 static struct wm8962_pdata wm8960_config_data = {
457 .gpio_init = {
458 [2] = WM8960_GPIO_FN_DMICCLK,
459 [4] = 0x8000 | WM8960_GPIO_FN_DMICDAT,
460 },
461 .clock_enable = wm8960_clk_enable,
462 };
463
464 static struct mxc_audio_platform_data wm8960_data = {
465 .ssi_num = 1,
466 .src_port = 2,
467 .ext_port = 3,
468 .hp_gpio = -1, //SABRESD_HEADPHONE_DET,
469 // .hp_active_low = 1,
470 .mic_gpio = -1, //SABRESD_MICROPHONE_DET,
471 // .mic_active_low = 1,
472 .init = mxc_wm8960_init,
473 .clock_enable = wm8960_clk_enable,
474 };
475
476 static struct regulator_consumer_supply sabresd_vwm8960_consumers[] = {
477 REGULATOR_SUPPLY("SPKVDD1", "0-001a"),
478 REGULATOR_SUPPLY("SPKVDD2", "0-001a"),
479 };
480
481 static struct regulator_init_data sabresd_vwm8960_init = {
482 .constraints = {
483 .name = "SPKVDD",
484 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
485 .boot_on = 1,
486 },
487 .num_consumer_supplies = ARRAY_SIZE(sabresd_vwm8960_consumers),
488 .consumer_supplies = sabresd_vwm8960_consumers,
489 };
490
491 static struct fixed_voltage_config sabresd_vwm8960_reg_config = {
492 .supply_name = "SPKVDD",
493 .microvolts = 4200000,
494 .gpio = SABRESD_CODEC_PWR_EN,
495 .enable_high = 1,
496 .enabled_at_boot = 1,
497 .init_data = &sabresd_vwm8960_init,
498 };
499
500 static struct platform_device sabresd_vwm8960_reg_devices = {
501 .name = "reg-fixed-voltage",
502 .id = 4,
503 .dev = {
504 .platform_data = &sabresd_vwm8960_reg_config,
505 },
506 };
...省略部分内容...
811 static struct i2c_board_info mxc_i2c0_board_info[] __initdata = {
812 {
813 I2C_BOARD_INFO("wm8960", 0x1a),
814 },
815 {
816 I2C_BOARD_INFO("ov564x", 0x3c),
817 .platform_data = (void *)&camera_data,
818 },
819 {
820 I2C_BOARD_INFO("mma8451", 0x1c),
821 .platform_data = (void *)&mma8451_position,
822 },
823 };
824
...省略部分内容...
1535 static int __init imx6q_init_audio(void)
1536 {
1537 if (board_is_mx6_reva()) {
1538 mxc_register_device(&mx6_sabresd_audio_wm8958_device,
1539 &wm8958_data);
1540 imx6q_add_imx_ssi(1, &mx6_sabresd_ssi_pdata);
1541
1542 mxc_wm8958_init();
1543 } else {
1544 platform_device_register(&sabresd_vwm8960_reg_devices);
1545 mxc_register_device(&mx6_sabresd_audio_wm8960_device,
1546 &wm8960_data);
1547 imx6q_add_imx_ssi(1, &mx6_sabresd_ssi_pdata);
1548
1549 mxc_wm8960_init();
1550 printk("%s\n", __FUNCTION__);
1551 }
1552
1553 return 0;
1554 }
...省略部分内容...
1859 if (board_is_mx6_reva()) {
1860 strcpy(mxc_i2c0_board_info[0].type, "wm8958");
1861 mxc_i2c0_board_info[0].platform_data = &wm8958_config_data;
1862 } else {
1863 strcpy(mxc_i2c0_board_info[0].type, "wm8960");
1864 mxc_i2c0_board_info[0].platform_data = &wm8960_config_data;
1865 }
4 修改wm8960.h:include/sound/wm8960.h
9 #ifndef _WM8960_PDATA_H
10 #define _WM8960_PDATA_H
11
12 #define WM8960_DRES_400R 0
13 #define WM8960_DRES_200R 1
14 #define WM8960_DRES_600R 2
15 #define WM8960_DRES_150R 3
16 #define WM8960_MAX_GPIO 6
17
18 #define WM8960_GPIO_FN_DMICCLK 19
19 #define WM8960_GPIO_FN_DMICDAT 20
20
21
22 struct wm8960_data {
23 bool capless; /* Headphone outputs configured in capless mode */
24
25 int dres; /* Discharge resistance for headphone outputs */
26
27 int gpio_base;
28 u32 gpio_init[WM8960_MAX_GPIO];
29
30 u32 mic_cfg;
31 bool irq_active_low;
32 bool spk_mono;
33 };
34
35 #endif
5 拷贝imx-wm8960.c到
sound/soc/imx/目录下(获取地址:https://github.com/PDi-Communication-Systems-Inc/kernel-imx/blob/6bfe025386e4419a50b1b1d5a847a1329d1745cd/sound/soc/imx/imx-wm8960.c)
修改同目录下Kconfig,添加如下:
80 config SND_SOC_IMX_WM8960
81 tristate "SoC Audio support for IMX boards with WM8960"
82 select SND_MXC_SOC_MX2
83 select SND_SOC_WM8960
84 help
85 Say Y if you want to add support for SoC audio on an i.MX board with
86 a WM8960 codec.
修改同目录下Makefile:
18 snd-soc-imx-wm8960-objs := imx-wm8960.o
30 obj-$(CONFIG_SND_SOC_IMX_WM8960) += snd-soc-imx-wm8960.o
用make menuconfig配置上wm8960,编译下载至开发板即可进行验证。
Ps :
一些调试命令及输出log:
root@imx6solo ~$ cat /proc/asound/cards
0 [wm8960audio ]: wm8960-audio - wm8960-audio
wm8960-audio
还可以用 ls /dev/snd 看是否有相关节点,如有,则声卡驱动大致ok。下面接着介绍测试的先关方法
6
移植alsa-lib
从官网( http://www.alsa-project.org/main/index.php/Download
)下载 alsa-lib-1.0.29.tar.bz2包,
6.1解压执行:
$ cd alsa-lib-1.0.29
$./configure --host=arm-none-linux-gnueabi --prefix=/home/***/alsa/alsa-lib
6.2 编译:
$ make
6.3 安装(需要root权限)
sudo make install
7 移植alsa-utils
从官网( http://www.alsa-project.org/main/index.php/Download
)下载 alsa-utils-1.0.29.tar.bz2
包,
7.1解压执行:
./configure --host=arm-none-linux-gnueabi --prefix=/home/**/alsa/alsa-utils --with-alsa-inc-prefix=/home/**/alsa/alsa-lib/include --with-alsa-prefix=/home/**/alsa/alsa-lib/lib --disable-alsamixer
注意上面最后的参数:--disable-alsamixer 若不加此参数编译会报错:
configure error required courses helper header not found 具体原因不清楚!!
7.2 编译
make
7.3安装(需要root权限)
sudo make install
8 开发板配置:
8.1 库的拷贝:
sudo cp alsa-lib/lib/libasound.* /home/**/rootfs/lib/
将alsa-utils/bin目录小的内容拷贝到目标板根文件系统中的bin下
sudo cp alsa-utils/bin/* /home/**/rootfs/bin
8.3 alsa的配置文件拷贝
除了库之外alsa的配置文件也需要拷贝到目标板根文件系统中,这里需要注意的是share目录在目标板的存放位置必须和在主机的存放路径一致!!
sudo cp -R **/alsa/alsa-lib/share/ /home/**/rootfs/**/alsa/alsa-lib/
重新挂载文件系统到目标板,通过 aplay -l可以查看我们的音频设备。
root@imx6solo ~$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
root@imx6solo ~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: wm8960audio [wm8960-audio], device 0: HiFi wm8960-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
播放声音文件:
aplay **.wav
最开始
一直没有声音,后来发现是wm8960没有初始化的原因,所以要对其进行初始化:
初始化步骤:
第1步 设置power1 2 3;
第2步 设置时钟;
第3步 设置ADC-DAC,注意设置非静音;
第4步 设置audio interface;
第5步 设置volume;
第6步 设置mixer;
可
参考如下代码(init at imx-wm8960.c:imx_hifi_hw_params function):
void wm8960_init(struct snd_soc_dai *codec_dai)
{
struct snd_soc_codec *codec = codec_dai->codec;
snd_soc_write(codec, 0x19, 0xc0); /* power1, ok*/
snd_soc_write(codec, 0x1a, 0x199); /* power2, ok*/
snd_soc_write(codec, 0x31, 0xf7); /* classd1 : enable L&R, ok */
snd_soc_write(codec, 0x33, 0x11b); /* classd3 : volume max, ok */
snd_soc_write(codec, 0x28, 0x179); /* ok */
snd_soc_write(codec, 0x29, 0x179); /* ok */
snd_soc_write(codec, 0x22, 0x100); /* dac to mixer, ok */
snd_soc_write(codec, 0x25, 0x100); /* dac to mixer, ok */
snd_soc_write(codec, 0x2f, 0x0c); /* left & right output mixer enable, ok */
snd_soc_write(codec, 0x05, 0x00); /* ok */
}