2
* Load Analog Devices SigmaStudio firmware files
4
* Copyright 2009-2011 Analog Devices Inc.
6
* Licensed under the GPL-2 or later.
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>
14
#include <linux/sigma.h>
16
/* Return: 0==OK, <0==error, =1 ==no more actions */
18
process_sigma_action(struct i2c_client *client, struct sigma_firmware *ssfw)
20
struct sigma_action *sa = (void *)(ssfw->fw->data + ssfw->pos);
21
size_t len = sigma_action_len(sa);
24
pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__,
25
sa->instr, sa->addr, len);
28
case SIGMA_ACTION_WRITEXBYTES:
29
case SIGMA_ACTION_WRITESINGLE:
30
case SIGMA_ACTION_WRITESAFELOAD:
31
if (ssfw->fw->size < ssfw->pos + len)
33
ret = i2c_master_send(client, (void *)&sa->addr, len);
38
case SIGMA_ACTION_DELAY:
44
case SIGMA_ACTION_END:
51
/* when arrive here ret=0 or sent data */
52
ssfw->pos += sigma_action_size(sa, len);
53
return ssfw->pos == ssfw->fw->size;
57
process_sigma_actions(struct i2c_client *client, struct sigma_firmware *ssfw)
59
pr_debug("%s: processing %p\n", __func__, ssfw);
62
int ret = process_sigma_action(client, ssfw);
63
pr_debug("%s: action returned %i\n", __func__, ret);
71
int process_sigma_firmware(struct i2c_client *client, const char *name)
74
struct sigma_firmware_header *ssfw_head;
75
struct sigma_firmware ssfw;
76
const struct firmware *fw;
79
pr_debug("%s: loading firmware %s\n", __func__, name);
81
/* first load the blob */
82
ret = request_firmware(&fw, name, &client->dev);
84
pr_debug("%s: request_firmware() failed with %i\n", __func__, ret);
89
/* then verify the header */
91
if (fw->size < sizeof(*ssfw_head))
94
ssfw_head = (void *)fw->data;
95
if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic)))
98
crc = crc32(0, fw->data, fw->size);
99
pr_debug("%s: crc=%x\n", __func__, crc);
100
if (crc != ssfw_head->crc)
103
ssfw.pos = sizeof(*ssfw_head);
105
/* finally process all of the actions */
106
ret = process_sigma_actions(client, &ssfw);
109
release_firmware(fw);
111
pr_debug("%s: loaded %s\n", __func__, name);
115
EXPORT_SYMBOL(process_sigma_firmware);