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);