Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / soc / codecs / adau1781-spi.c

diff --git a/kernel/sound/soc/codecs/adau1781-spi.c b/kernel/sound/soc/codecs/adau1781-spi.c
new file mode 100644 (file)
index 0000000..1946867
--- /dev/null
+++ b/kernel/sound/soc/codecs/adau1781-spi.c
@@ -0,0 +1,75 @@
+/*
+ * Driver for ADAU1381/ADAU1781 CODEC
+ *
+ * Copyright 2014 Analog Devices Inc.
+ *  Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <sound/soc.h>
+
+#include "adau1781.h"
+
+static void adau1781_spi_switch_mode(struct device *dev)
+{
+       struct spi_device *spi = to_spi_device(dev);
+
+       /*
+        * To get the device into SPI mode CLATCH has to be pulled low three
+        * times.  Do this by issuing three dummy reads.
+        */
+       spi_w8r8(spi, 0x00);
+       spi_w8r8(spi, 0x00);
+       spi_w8r8(spi, 0x00);
+}
+
+static int adau1781_spi_probe(struct spi_device *spi)
+{
+       const struct spi_device_id *id = spi_get_device_id(spi);
+       struct regmap_config config;
+
+       if (!id)
+               return -EINVAL;
+
+       config = adau1781_regmap_config;
+       config.val_bits = 8;
+       config.reg_bits = 24;
+       config.read_flag_mask = 0x1;
+
+       return adau1781_probe(&spi->dev,
+               devm_regmap_init_spi(spi, &config),
+               id->driver_data, adau1781_spi_switch_mode);
+}
+
+static int adau1781_spi_remove(struct spi_device *spi)
+{
+       snd_soc_unregister_codec(&spi->dev);
+       return 0;
+}
+
+static const struct spi_device_id adau1781_spi_id[] = {
+       { "adau1381", ADAU1381 },
+       { "adau1781", ADAU1781 },
+       { }
+};
+MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
+
+static struct spi_driver adau1781_spi_driver = {
+       .driver = {
+               .name = "adau1781",
+               .owner = THIS_MODULE,
+       },
+       .probe = adau1781_spi_probe,
+       .remove = adau1781_spi_remove,
+       .id_table = adau1781_spi_id,
+};
+module_spi_driver(adau1781_spi_driver);
+
+MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_LICENSE("GPL");