1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Load Analog Devices SigmaStudio firmware files |
4 | * |
5 | * Copyright 2009-2011 Analog Devices Inc. |
6 | */ |
7 | |
8 | #include <linux/export.h> |
9 | #include <linux/i2c.h> |
10 | #include <linux/module.h> |
11 | #include <linux/slab.h> |
12 | #include <asm/unaligned.h> |
13 | |
14 | #include "sigmadsp.h" |
15 | |
16 | static int sigmadsp_write_i2c(void *control_data, |
17 | unsigned int addr, const uint8_t data[], size_t len) |
18 | { |
19 | uint8_t *buf; |
20 | int ret; |
21 | |
22 | buf = kzalloc(size: 2 + len, GFP_KERNEL | GFP_DMA); |
23 | if (!buf) |
24 | return -ENOMEM; |
25 | |
26 | put_unaligned_be16(val: addr, p: buf); |
27 | memcpy(buf + 2, data, len); |
28 | |
29 | ret = i2c_master_send(client: control_data, buf, count: len + 2); |
30 | |
31 | kfree(objp: buf); |
32 | |
33 | if (ret < 0) |
34 | return ret; |
35 | |
36 | return 0; |
37 | } |
38 | |
39 | static int sigmadsp_read_i2c(void *control_data, |
40 | unsigned int addr, uint8_t data[], size_t len) |
41 | { |
42 | struct i2c_client *client = control_data; |
43 | struct i2c_msg msgs[2]; |
44 | uint8_t buf[2]; |
45 | int ret; |
46 | |
47 | put_unaligned_be16(val: addr, p: buf); |
48 | |
49 | msgs[0].addr = client->addr; |
50 | msgs[0].len = sizeof(buf); |
51 | msgs[0].buf = buf; |
52 | msgs[0].flags = 0; |
53 | |
54 | msgs[1].addr = client->addr; |
55 | msgs[1].len = len; |
56 | msgs[1].buf = data; |
57 | msgs[1].flags = I2C_M_RD; |
58 | |
59 | ret = i2c_transfer(adap: client->adapter, msgs, ARRAY_SIZE(msgs)); |
60 | if (ret < 0) |
61 | return ret; |
62 | else if (ret != ARRAY_SIZE(msgs)) |
63 | return -EIO; |
64 | return 0; |
65 | } |
66 | |
67 | /** |
68 | * devm_sigmadsp_init_i2c() - Initialize SigmaDSP instance |
69 | * @client: The parent I2C device |
70 | * @ops: The sigmadsp_ops to use for this instance |
71 | * @firmware_name: Name of the firmware file to load |
72 | * |
73 | * Allocates a SigmaDSP instance and loads the specified firmware file. |
74 | * |
75 | * Returns a pointer to a struct sigmadsp on success, or a PTR_ERR() on error. |
76 | */ |
77 | struct sigmadsp *devm_sigmadsp_init_i2c(struct i2c_client *client, |
78 | const struct sigmadsp_ops *ops, const char *firmware_name) |
79 | { |
80 | struct sigmadsp *sigmadsp; |
81 | |
82 | sigmadsp = devm_sigmadsp_init(dev: &client->dev, ops, firmware_name); |
83 | if (IS_ERR(ptr: sigmadsp)) |
84 | return sigmadsp; |
85 | |
86 | sigmadsp->control_data = client; |
87 | sigmadsp->write = sigmadsp_write_i2c; |
88 | sigmadsp->read = sigmadsp_read_i2c; |
89 | |
90 | return sigmadsp; |
91 | } |
92 | EXPORT_SYMBOL_GPL(devm_sigmadsp_init_i2c); |
93 | |
94 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>" ); |
95 | MODULE_DESCRIPTION("SigmaDSP I2C firmware loader" ); |
96 | MODULE_LICENSE("GPL" ); |
97 | |