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/*
* 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);
if (ret < 0)
return ret;
return 0;
}
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");
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