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61c4a1ac4d
Forwarding the return value of i2c_master_send, leads to errors later on, since i2c_master_send returns the number of bytes transmittet. Check for ret < 0 instead and return 0 otherwise. Signed-off-by: Pascal Huerst <pascal.huerst@gmail.com> Acked-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@kernel.org>
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
/*
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* Load Analog Devices SigmaStudio firmware files
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*
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* Copyright 2009-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/export.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#include "sigmadsp.h"
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static int sigmadsp_write_i2c(void *control_data,
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unsigned int addr, const uint8_t data[], size_t len)
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{
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uint8_t *buf;
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int ret;
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buf = kzalloc(2 + len, GFP_KERNEL | GFP_DMA);
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if (!buf)
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return -ENOMEM;
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put_unaligned_be16(addr, buf);
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memcpy(buf + 2, data, len);
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ret = i2c_master_send(control_data, buf, len + 2);
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kfree(buf);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int sigmadsp_read_i2c(void *control_data,
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unsigned int addr, uint8_t data[], size_t len)
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{
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struct i2c_client *client = control_data;
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struct i2c_msg msgs[2];
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uint8_t buf[2];
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int ret;
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put_unaligned_be16(addr, buf);
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msgs[0].addr = client->addr;
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msgs[0].len = sizeof(buf);
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msgs[0].buf = buf;
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msgs[0].flags = 0;
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msgs[1].addr = client->addr;
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msgs[1].len = len;
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msgs[1].buf = data;
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msgs[1].flags = I2C_M_RD;
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret < 0)
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return ret;
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else if (ret != ARRAY_SIZE(msgs))
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return -EIO;
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return 0;
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}
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/**
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* devm_sigmadsp_init_i2c() - Initialize SigmaDSP instance
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* @client: The parent I2C device
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* @ops: The sigmadsp_ops to use for this instance
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* @firmware_name: Name of the firmware file to load
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*
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* Allocates a SigmaDSP instance and loads the specified firmware file.
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*
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* Returns a pointer to a struct sigmadsp on success, or a PTR_ERR() on error.
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*/
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struct sigmadsp *devm_sigmadsp_init_i2c(struct i2c_client *client,
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const struct sigmadsp_ops *ops, const char *firmware_name)
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{
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struct sigmadsp *sigmadsp;
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sigmadsp = devm_sigmadsp_init(&client->dev, ops, firmware_name);
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if (IS_ERR(sigmadsp))
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return sigmadsp;
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sigmadsp->control_data = client;
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sigmadsp->write = sigmadsp_write_i2c;
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sigmadsp->read = sigmadsp_read_i2c;
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return sigmadsp;
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}
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EXPORT_SYMBOL_GPL(devm_sigmadsp_init_i2c);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("SigmaDSP I2C firmware loader");
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MODULE_LICENSE("GPL");
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