Commit | Line | Data |
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6b10998d LPC |
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 | ||
6b10998d | 9 | #include <linux/export.h> |
d48b088e | 10 | #include <linux/i2c.h> |
6b10998d | 11 | #include <linux/module.h> |
d48b088e LPC |
12 | #include <linux/slab.h> |
13 | #include <asm/unaligned.h> | |
6b10998d LPC |
14 | |
15 | #include "sigmadsp.h" | |
16 | ||
d48b088e LPC |
17 | static int sigmadsp_write_i2c(void *control_data, |
18 | unsigned int addr, const uint8_t data[], size_t len) | |
6b10998d | 19 | { |
d48b088e LPC |
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 | ||
61c4a1ac PH |
34 | if (ret < 0) |
35 | return ret; | |
36 | ||
37 | return 0; | |
6b10998d LPC |
38 | } |
39 | ||
a35daac7 LPC |
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 | ||
d48b088e LPC |
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) | |
6b10998d | 80 | { |
d48b088e LPC |
81 | struct sigmadsp *sigmadsp; |
82 | ||
83 | sigmadsp = devm_sigmadsp_init(&client->dev, ops, firmware_name); | |
84 | if (IS_ERR(sigmadsp)) | |
85 | return sigmadsp; | |
6b10998d | 86 | |
d48b088e LPC |
87 | sigmadsp->control_data = client; |
88 | sigmadsp->write = sigmadsp_write_i2c; | |
a35daac7 | 89 | sigmadsp->read = sigmadsp_read_i2c; |
6b10998d | 90 | |
d48b088e | 91 | return sigmadsp; |
6b10998d | 92 | } |
d48b088e | 93 | EXPORT_SYMBOL_GPL(devm_sigmadsp_init_i2c); |
6b10998d LPC |
94 | |
95 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
96 | MODULE_DESCRIPTION("SigmaDSP I2C firmware loader"); | |
97 | MODULE_LICENSE("GPL"); |