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         if (ret < 0)
  35                 return ret;
  36
  37         return 0;
  38 }
  39
  40 static int sigmadsp_read_i2c(void *control_data,
  41         unsigned int addr, uint8_t data[], size_t len)
  42 {
  43         struct i2c_client *client = control_data;
  44         struct i2c_msg msgs[2];
  45         uint8_t buf[2];
  46         int ret;
  47
  48         put_unaligned_be16(addr, buf);
  49
  50         msgs[0].addr = client->addr;
  51         msgs[0].len = sizeof(buf);
  52         msgs[0].buf = buf;
  53         msgs[0].flags = 0;
  54
  55         msgs[1].addr = client->addr;
  56         msgs[1].len = len;
  57         msgs[1].buf = data;
  58         msgs[1].flags = I2C_M_RD;
  59
  60         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
  61         if (ret < 0)
  62                 return ret;
  63         else if (ret != ARRAY_SIZE(msgs))
  64                 return -EIO;
  65         return 0;
  66 }
  67
  68 /**
  69  * devm_sigmadsp_init_i2c() - Initialize SigmaDSP instance
  70  * @client: The parent I2C device
  71  * @ops: The sigmadsp_ops to use for this instance
  72  * @firmware_name: Name of the firmware file to load
  73  *
  74  * Allocates a SigmaDSP instance and loads the specified firmware file.
  75  *
  76  * Returns a pointer to a struct sigmadsp on success, or a PTR_ERR() on error.
  77  */
  78 struct sigmadsp *devm_sigmadsp_init_i2c(struct i2c_client *client,
  79         const struct sigmadsp_ops *ops, const char *firmware_name)
  80 {
  81         struct sigmadsp *sigmadsp;
  82
  83         sigmadsp = devm_sigmadsp_init(&client->dev, ops, firmware_name);
  84         if (IS_ERR(sigmadsp))
  85                 return sigmadsp;
  86
  87         sigmadsp->control_data = client;
  88         sigmadsp->write = sigmadsp_write_i2c;
  89         sigmadsp->read = sigmadsp_read_i2c;
  90
  91         return sigmadsp;
  92 }
  93 EXPORT_SYMBOL_GPL(devm_sigmadsp_init_i2c);
  94
  95 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
  96 MODULE_DESCRIPTION("SigmaDSP I2C firmware loader");
  97 MODULE_LICENSE("GPL");