ssm4567 驱动初始化时soft_reset写入0，出错，返回-5，其它寄存器写入默认值正常，可以正常读出

Question

Hi ADI, 
 we using ssm4567 on linux 3.10, while driver init, write soft_reset(0xff) to 0, return error code -5. other register can read write ok. what's the problem?

sarvdo · Accepted Answer

Hi ADI, 
 we using ssm4567 on allwinner A40i platform(Linux 3.10).i2c(0x34) interface can detect and read register value as following,but while insmod the codec driver module which got from github.com, the Soft_reset（0xff) return -5.(issue #1) 
 #2 issue, which we are using tinymix cmd, to config the control path, there is no any control path return. 
 #3. how to config the control path?

sarvdo · Answer

if we using alsamix, (not tinymix) pls list the setting cmd. 
 the driver is download from your web site........

btogorean · Answer

Hi, 
 First can you please point us to the source of the driver you use for ssm4567? I'm asking this because I see that you have kernel 3.10.65 but I was not able to find ssm4567 in the sources for that version and it looks like the driver was merged in upstream later. Did you backported it from a newer kernel version? 
 Related to the problems you're seeing: 
 The error "Error in caching of register: ff ret: -5" can be expected because register 0xFF is write only. I think in datasheet there is a mistake being marked R only. So when regmap framework tries to read that register in order to cache it is failing. 
 In 5.15 upstream the SSM4567_REG_SOFT_RESET register is not in readable_reg list so check to be the same on your version of the driver. 
 #2: For configuring I think the tool you want is amixer. It can list you all available controls and allows you to read the current state of a control and also set the state. We have a good wiki page for this topic here. 
 #3: If you want to just readback registers and check if what you set over amixer applied correctly to the chip I think you can leverage the Linux debugfs regmap interface.

btogorean · Answer

Hi, I mean the right connection is the one showed in the datasheet with only one speaker connected to one SSM4567 part.

If you connect two speakers like bellow that's wrong. You can tell that even from sense lines because current through speaker connected to OUTN would not be monitored.

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ssm4567 驱动初始化时soft_reset写入0，出错，返回-5，其它寄存器写入默认值正常，可以正常读出

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