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/module.h>
15 #include <linux/sigma.h>
16 #include <linux/export.h>
18 /* Return: 0==OK, <0==error, =1 ==no more actions */
20 process_sigma_action(struct i2c_client *client, struct sigma_firmware *ssfw)
22 struct sigma_action *sa = (void *)(ssfw->fw->data + ssfw->pos);
23 size_t len = sigma_action_len(sa);
26 pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__,
27 sa->instr, sa->addr, len);
30 case SIGMA_ACTION_WRITEXBYTES:
31 case SIGMA_ACTION_WRITESINGLE:
32 case SIGMA_ACTION_WRITESAFELOAD:
33 if (ssfw->fw->size < ssfw->pos + len)
35 ret = i2c_master_send(client, (void *)&sa->addr, len);
40 case SIGMA_ACTION_DELAY:
46 case SIGMA_ACTION_END:
53 /* when arrive here ret=0 or sent data */
54 ssfw->pos += sigma_action_size(sa, len);
55 return ssfw->pos == ssfw->fw->size;
59 process_sigma_actions(struct i2c_client *client, struct sigma_firmware *ssfw)
61 pr_debug("%s: processing %p\n", __func__, ssfw);
64 int ret = process_sigma_action(client, ssfw);
65 pr_debug("%s: action returned %i\n", __func__, ret);
73 int process_sigma_firmware(struct i2c_client *client, const char *name)
76 struct sigma_firmware_header *ssfw_head;
77 struct sigma_firmware ssfw;
78 const struct firmware *fw;
81 pr_debug("%s: loading firmware %s\n", __func__, name);
83 /* first load the blob */
84 ret = request_firmware(&fw, name, &client->dev);
86 pr_debug("%s: request_firmware() failed with %i\n", __func__, ret);
91 /* then verify the header */
93 if (fw->size < sizeof(*ssfw_head))
96 ssfw_head = (void *)fw->data;
97 if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic)))
100 crc = crc32(0, fw->data, fw->size);
101 pr_debug("%s: crc=%x\n", __func__, crc);
102 if (crc != ssfw_head->crc)
105 ssfw.pos = sizeof(*ssfw_head);
107 /* finally process all of the actions */
108 ret = process_sigma_actions(client, &ssfw);
111 release_firmware(fw);
113 pr_debug("%s: loaded %s\n", __func__, name);
117 EXPORT_SYMBOL(process_sigma_firmware);
119 MODULE_LICENSE("GPL");