sound/soc/codecs/sigmadsp-i2c.c

   1 /*
   2  * Load Analog Devices SigmaStudio firmware files
   3  *
   4  * Copyright 2009-2011 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/export.h>
  10 #include <linux/i2c.h>
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <asm/unaligned.h>
  14
  15 #include "sigmadsp.h"
  16
  17 static int sigmadsp_write_i2c(void *control_data,
  18         unsigned int addr, const uint8_t data[], size_t len)
  19 {
  20         uint8_t *buf;
  21         int ret;
  22
  23         buf = kzalloc(2 + len, GFP_KERNEL | GFP_DMA);
  24         if (!buf)
  25                 return -ENOMEM;
  26
  27         put_unaligned_be16(addr, buf);
  28         memcpy(buf + 2, data, len);
  29
  30         ret = i2c_master_send(control_data, buf, len + 2);
  31
  32         kfree(buf);
  33
  34         return ret;
  35 }
  36
  37 static int sigmadsp_read_i2c(void *control_data,
  38         unsigned int addr, uint8_t data[], size_t len)
  39 {
  40         struct i2c_client *client = control_data;
  41         struct i2c_msg msgs[2];
  42         uint8_t buf[2];
  43         int ret;
  44
  45         put_unaligned_be16(addr, buf);
  46
  47         msgs[0].addr = client->addr;
  48         msgs[0].len = sizeof(buf);
  49         msgs[0].buf = buf;
  50         msgs[0].flags = 0;
  51
  52         msgs[1].addr = client->addr;
  53         msgs[1].len = len;
  54         msgs[1].buf = data;
  55         msgs[1].flags = I2C_M_RD;
  56
  57         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
  58         if (ret < 0)
  59                 return ret;
  60         else if (ret != ARRAY_SIZE(msgs))
  61                 return -EIO;
  62         return 0;
  63 }
  64
  65 /**
  66  * devm_sigmadsp_init_i2c() - Initialize SigmaDSP instance
  67  * @client: The parent I2C device
  68  * @ops: The sigmadsp_ops to use for this instance
  69  * @firmware_name: Name of the firmware file to load
  70  *
  71  * Allocates a SigmaDSP instance and loads the specified firmware file.
  72  *
  73  * Returns a pointer to a struct sigmadsp on success, or a PTR_ERR() on error.
  74  */
  75 struct sigmadsp *devm_sigmadsp_init_i2c(struct i2c_client *client,
  76         const struct sigmadsp_ops *ops, const char *firmware_name)
  77 {
  78         struct sigmadsp *sigmadsp;
  79
  80         sigmadsp = devm_sigmadsp_init(&client->dev, ops, firmware_name);
  81         if (IS_ERR(sigmadsp))
  82                 return sigmadsp;
  83
  84         sigmadsp->control_data = client;
  85         sigmadsp->write = sigmadsp_write_i2c;
  86         sigmadsp->read = sigmadsp_read_i2c;
  87
  88         return sigmadsp;
  89 }
  90 EXPORT_SYMBOL_GPL(devm_sigmadsp_init_i2c);
  91
  92 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
  93 MODULE_DESCRIPTION("SigmaDSP I2C firmware loader");
  94 MODULE_LICENSE("GPL");