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e359dc24 MF |
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/crc32.h> | |
10 | #include <linux/delay.h> | |
11 | #include <linux/firmware.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/i2c.h> | |
27c46a25 | 14 | #include <linux/module.h> |
e359dc24 MF |
15 | #include <linux/sigma.h> |
16 | ||
17 | /* Return: 0==OK, <0==error, =1 ==no more actions */ | |
18 | static int | |
19 | process_sigma_action(struct i2c_client *client, struct sigma_firmware *ssfw) | |
20 | { | |
21 | struct sigma_action *sa = (void *)(ssfw->fw->data + ssfw->pos); | |
22 | size_t len = sigma_action_len(sa); | |
23 | int ret = 0; | |
24 | ||
25 | pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__, | |
26 | sa->instr, sa->addr, len); | |
27 | ||
28 | switch (sa->instr) { | |
29 | case SIGMA_ACTION_WRITEXBYTES: | |
30 | case SIGMA_ACTION_WRITESINGLE: | |
31 | case SIGMA_ACTION_WRITESAFELOAD: | |
32 | if (ssfw->fw->size < ssfw->pos + len) | |
33 | return -EINVAL; | |
34 | ret = i2c_master_send(client, (void *)&sa->addr, len); | |
35 | if (ret < 0) | |
36 | return -EINVAL; | |
37 | break; | |
38 | ||
39 | case SIGMA_ACTION_DELAY: | |
40 | ret = 0; | |
41 | udelay(len); | |
42 | len = 0; | |
43 | break; | |
44 | ||
45 | case SIGMA_ACTION_END: | |
46 | return 1; | |
47 | ||
48 | default: | |
49 | return -EINVAL; | |
50 | } | |
51 | ||
52 | /* when arrive here ret=0 or sent data */ | |
53 | ssfw->pos += sigma_action_size(sa, len); | |
54 | return ssfw->pos == ssfw->fw->size; | |
55 | } | |
56 | ||
57 | static int | |
58 | process_sigma_actions(struct i2c_client *client, struct sigma_firmware *ssfw) | |
59 | { | |
60 | pr_debug("%s: processing %p\n", __func__, ssfw); | |
61 | ||
62 | while (1) { | |
63 | int ret = process_sigma_action(client, ssfw); | |
64 | pr_debug("%s: action returned %i\n", __func__, ret); | |
65 | if (ret == 1) | |
66 | return 0; | |
67 | else if (ret) | |
68 | return ret; | |
69 | } | |
70 | } | |
71 | ||
72 | int process_sigma_firmware(struct i2c_client *client, const char *name) | |
73 | { | |
74 | int ret; | |
75 | struct sigma_firmware_header *ssfw_head; | |
76 | struct sigma_firmware ssfw; | |
77 | const struct firmware *fw; | |
78 | u32 crc; | |
79 | ||
80 | pr_debug("%s: loading firmware %s\n", __func__, name); | |
81 | ||
82 | /* first load the blob */ | |
83 | ret = request_firmware(&fw, name, &client->dev); | |
84 | if (ret) { | |
85 | pr_debug("%s: request_firmware() failed with %i\n", __func__, ret); | |
86 | return ret; | |
87 | } | |
88 | ssfw.fw = fw; | |
89 | ||
90 | /* then verify the header */ | |
91 | ret = -EINVAL; | |
92 | if (fw->size < sizeof(*ssfw_head)) | |
93 | goto done; | |
94 | ||
95 | ssfw_head = (void *)fw->data; | |
96 | if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic))) | |
97 | goto done; | |
98 | ||
99 | crc = crc32(0, fw->data, fw->size); | |
100 | pr_debug("%s: crc=%x\n", __func__, crc); | |
101 | if (crc != ssfw_head->crc) | |
102 | goto done; | |
103 | ||
104 | ssfw.pos = sizeof(*ssfw_head); | |
105 | ||
106 | /* finally process all of the actions */ | |
107 | ret = process_sigma_actions(client, &ssfw); | |
108 | ||
109 | done: | |
110 | release_firmware(fw); | |
111 | ||
112 | pr_debug("%s: loaded %s\n", __func__, name); | |
113 | ||
114 | return ret; | |
115 | } | |
116 | EXPORT_SYMBOL(process_sigma_firmware); | |
27c46a25 RD |
117 | |
118 | MODULE_LICENSE("GPL"); |