Re: [alsa-devel] [PATCH 1/5] [RFC] ALSA ASoC driver for TLVaic23b audio codec
Mark Brown wrote:
On Mon, Sep 29, 2008 at 03:15:04PM +0530, Arun KS wrote:
ASOC Audio driver for TLVaic23b audio codec
This looks good overall, thanks! There's quite a few comments below but they're mostly minor things at the coding style issues.
The only issue I've got overall is that the name of the codec seems to vary through the driver - sometimes it's referred to as the tlv320aic23, sometimes as aic23 and sometimes as tlvaic23. It'd be good if the naming scheme were more consistent. My inclination would be to go with tlv320aic23 since it will reduce the risk of collisions and the general style is to use the full part number (then again, I know the tlv320aic3x driver didn't do that).
--- a/sound/soc/codecs/Kconfig +++ b/sound/soc/codecs/Kconfig @@ -55,3 +55,7 @@ config SND_SOC_TWL4030 tristate depends on SND_SOC && TWL4030_CORE
This patch is against the OMAP tree - please generate all submitted patches against either the ASoC dev tree or the topic/asoc branch of:
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git
Even if other patches in the series depend on the OMAP tree there should be no reason not to merge an I2C codec driver like this with no external dependencies immediately.
+config SND_SOC_TLV320AIC23
- tristate
- depends on I2C
Please also add this to the SND_SOC_ALL_CODECS Kconfig option.
+static int aic23_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)+{
- u8 data;
- /* TLV320AIC23 has 7 bit address and 9 bits of data
* so we need to switch one data bit into reg and rest* of data into val*/- if ((reg < 0 || reg > 9) && (reg != 15)) {
printk(KERN_WARNING "Invalid register R%d\n", reg);return -1;- }
It'd be nice if this said which device was being written to - adding in the driver name to the printk(), for example. It'd make it easier for someone seeing the message in their logs to work out where it came from.
- data = (reg << 1) | (value >> 8 & 0x01);
- aic23_write_reg_cache(codec, reg, value);
- if (codec->hw_write(codec->control_data, (u8) data,
(u8) (value & 0xff)) == 0)return 0;- printk(KERN_ERR "I2C: cannot write %03x to register R%d\n", value, reg);
Again, saying where the error came from would be nice.
SOC_SINGLE("Mic Mute", ANALOG_AUDIO_CONTROL_ADDR, 1, 0x01, 0),This should be "Mic Switch" to help UIs display the control correctly.
+/* aic23 related */ +static const struct aic23_samplerate_reg_info
- rate_reg_info[NUMBER_SAMPLE_RATES_SUPPORTED] = {
- {4000, 0x06, 1}, /* 4000 */
You could just use [] for the size of the array and let the compiler figure it out - you actually use ARRAY_SIZE() rather than the #define for the array size later anyway.
+static int aic23_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)+{
- u16 reg;
- switch (level) {
- case SND_SOC_BIAS_ON:
reg = aic23_read_reg_cache(codec, POWER_DOWN_CONTROL_ADDR);aic23_write(codec, POWER_DOWN_CONTROL_ADDR,reg & (~DEVICE_POWER_OFF));/* Activate interface */reg = aic23_read_reg_cache(codec, DIGITAL_INTERFACE_ACT_ADDR);aic23_write(codec, DIGITAL_INTERFACE_ACT_ADDR, reg | ACT_ON);break;- case SND_SOC_BIAS_PREPARE:
break;- case SND_SOC_BIAS_STANDBY:
reg = aic23_read_reg_cache(codec, POWER_DOWN_CONTROL_ADDR);aic23_write(codec, POWER_DOWN_CONTROL_ADDR,reg | DEVICE_POWER_OFF);/* Deactivate interface */reg = aic23_read_reg_cache(codec, DIGITAL_INTERFACE_ACT_ADDR);aic23_write(codec, DIGITAL_INTERFACE_ACT_ADDR, reg & (~ACT_ON));Hrm. This probably deserves a comment about what DEVICE_POWER_OFF does that the normal DAPM control doesn't. Given that there are no bypass paths there should be no risk of interfering with DAPM but it raises a bit of an eyebrow.
There is bypass for Line and sidetone for Mic.
I will add that also and will make DEVICE_POWER_OFF also as DAPM control. Will send the patches against ASoC dev tree.
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
- codec->hw_write = (hw_write_t) i2c_smbus_write_byte_data;
- codec->hw_read = NULL;
- ret = i2c_add_driver(&aic23b_i2c_driver);
- if (ret != 0)
printk(KERN_ERR "can't add i2c driver");+#else
- /* Add other interfaces here */
+#endif
If the device doesn't support anything except I2C then please remove all the conditionals on I2C support from the driver (they don't add anything). If the device does support other control methods then please change this to be something like:
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) ... #endif /* Add other interfaces here */
That way if someone adds support for the other control interfaces they'll be encouraged to do it in a way that allows kernels to be built supporting multiple systems simultaneously.
+#define AIC23_CACHEREGNUM 16 +/* Codec TLV320AIC23 */ +#define LEFT_LINE_VOLUME_ADDR 0x00 +#define RIGHT_LINE_VOLUME_ADDR 0x01 +#define LEFT_CHANNEL_VOLUME_ADDR 0x02 +#define RIGHT_CHANNEL_VOLUME_ADDR 0x03 +#define ANALOG_AUDIO_CONTROL_ADDR 0x04 +#define DIGITAL_AUDIO_CONTROL_ADDR 0x05 +#define POWER_DOWN_CONTROL_ADDR 0x06 +#define DIGITAL_AUDIO_FORMAT_ADDR 0x07 +#define SAMPLE_RATE_CONTROL_ADDR 0x08 +#define DIGITAL_INTERFACE_ACT_ADDR 0x09 +#define RESET_CONTROL_ADDR 0x0F
These (and most of the rest of the defines in the header) should all be namespaced - there's a very good chance of them colliding with other things and this header is going to be included in the machine drivers.
+/* Define to set the AIC23 as the master w.r.t McBSP */ +#define AIC23_MASTER
+#ifndef DEFAULT_BITPERSAMPLE +#define DEFAULT_BITPERSAMPLE 16 +#endif
+#define DEFAULT_SAMPLE_RATE 44100 +#define CODEC_CLOCK 12000000 +#define AUDIO_MCBSP OMAP_MCBSP1
None of these should be in this driver - they should all be part of the machine driver.
+struct aic23_samplerate_reg_info {
- u32 sample_rate;
- u8 control; /* SR3, SR2, SR1, SR0 and BOSR */
- u8 divider /* if 0 CLKIN = MCLK, if 1 CLKIN = MCLK/2 */
+};
This could just be pushed into the driver.
participants (1)
-
Arun KS