ALSA: hda: cs35l41: Add Amp Name based on channel and index

This will be used to identify ALSA controls and firmware.
The Amp Name will be a channel identifier (L or R), and an
index, which identifies which amp for that channel.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220509214703.4482-10-vitalyr@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: Stefan Binding

sound/pci/hda/cs35l41_hda.c

@@ -88,6 +88,17 @@ static int cs35l41_hda_channel_map(struct device *dev, unsigned int tx_num, unsi
 				    unsigned int rx_num, unsigned int *rx_slot)
 {
 	struct cs35l41_hda *cs35l41 = dev_get_drvdata(dev);
+	static const char * const channel_name[] = { "L", "R" };
+
+	if (!cs35l41->amp_name) {
+		if (*rx_slot >= ARRAY_SIZE(channel_name))
+			return -EINVAL;
+
+		cs35l41->amp_name = devm_kasprintf(cs35l41->dev, GFP_KERNEL, "%s%d",
+						   channel_name[*rx_slot], cs35l41->channel_index);
+		if (!cs35l41->amp_name)
+			return -ENOMEM;
+	}
 
 	return cs35l41_set_channels(cs35l41->dev, cs35l41->regmap, tx_num, tx_slot, rx_num,
 				    rx_slot);
@@ -345,6 +356,11 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i
 		goto err;
 	hw_cfg->spk_pos = values[cs35l41->index];
 
+	cs35l41->channel_index = 0;
+	for (i = 0; i < cs35l41->index; i++)
+		if (values[i] == hw_cfg->spk_pos)
+			cs35l41->channel_index++;
+
 	property = "cirrus,gpio1-func";
 	ret = device_property_read_u32_array(physdev, property, values, nval);
 	if (ret)
@@ -410,6 +426,7 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i
 	/* check I2C address to assign the index */
 	cs35l41->index = id == 0x40 ? 0 : 1;
 	cs35l41->hw_cfg.spk_pos = cs35l41->index;
+	cs35l41->channel_index = 0;
 	cs35l41->reset_gpio = gpiod_get_index(physdev, NULL, 0, GPIOD_OUT_HIGH);
 	cs35l41->hw_cfg.bst_type = CS35L41_EXT_BOOST_NO_VSPK_SWITCH;
 	hw_cfg->gpio2.func = CS35L41_GPIO2_INT_OPEN_DRAIN;

sound/pci/hda/cs35l41_hda.h

@@ -35,7 +35,9 @@ struct cs35l41_hda {
 
 	int irq;
 	int index;
+	int channel_index;
 	unsigned volatile long irq_errors;
+	const char *amp_name;
 	struct regmap_irq_chip_data *irq_data;
 };