Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / soc / codecs / sigmadsp-i2c.c

diff --git a/kernel/sound/soc/codecs/sigmadsp-i2c.c b/kernel/sound/soc/codecs/sigmadsp-i2c.c
new file mode 100644 (file)
index 0000000..21ca3a5
--- /dev/null
+++ b/kernel/sound/soc/codecs/sigmadsp-i2c.c
@@ -0,0 +1,94 @@
+/*
+ * Load Analog Devices SigmaStudio firmware files
+ *
+ * Copyright 2009-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/export.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+
+#include "sigmadsp.h"
+
+static int sigmadsp_write_i2c(void *control_data,
+       unsigned int addr, const uint8_t data[], size_t len)
+{
+       uint8_t *buf;
+       int ret;
+
+       buf = kzalloc(2 + len, GFP_KERNEL | GFP_DMA);
+       if (!buf)
+               return -ENOMEM;
+
+       put_unaligned_be16(addr, buf);
+       memcpy(buf + 2, data, len);
+
+       ret = i2c_master_send(control_data, buf, len + 2);
+
+       kfree(buf);
+
+       return ret;
+}
+
+static int sigmadsp_read_i2c(void *control_data,
+       unsigned int addr, uint8_t data[], size_t len)
+{
+       struct i2c_client *client = control_data;
+       struct i2c_msg msgs[2];
+       uint8_t buf[2];
+       int ret;
+
+       put_unaligned_be16(addr, buf);
+
+       msgs[0].addr = client->addr;
+       msgs[0].len = sizeof(buf);
+       msgs[0].buf = buf;
+       msgs[0].flags = 0;
+
+       msgs[1].addr = client->addr;
+       msgs[1].len = len;
+       msgs[1].buf = data;
+       msgs[1].flags = I2C_M_RD;
+
+       ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+       if (ret < 0)
+               return ret;
+       else if (ret != ARRAY_SIZE(msgs))
+               return -EIO;
+       return 0;
+}
+
+/**
+ * devm_sigmadsp_init_i2c() - Initialize SigmaDSP instance
+ * @client: The parent I2C device
+ * @ops: The sigmadsp_ops to use for this instance
+ * @firmware_name: Name of the firmware file to load
+ *
+ * Allocates a SigmaDSP instance and loads the specified firmware file.
+ *
+ * Returns a pointer to a struct sigmadsp on success, or a PTR_ERR() on error.
+ */
+struct sigmadsp *devm_sigmadsp_init_i2c(struct i2c_client *client,
+       const struct sigmadsp_ops *ops, const char *firmware_name)
+{
+       struct sigmadsp *sigmadsp;
+
+       sigmadsp = devm_sigmadsp_init(&client->dev, ops, firmware_name);
+       if (IS_ERR(sigmadsp))
+               return sigmadsp;
+
+       sigmadsp->control_data = client;
+       sigmadsp->write = sigmadsp_write_i2c;
+       sigmadsp->read = sigmadsp_read_i2c;
+
+       return sigmadsp;
+}
+EXPORT_SYMBOL_GPL(devm_sigmadsp_init_i2c);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("SigmaDSP I2C firmware loader");
+MODULE_LICENSE("GPL");