119 строки
2.5 KiB
C
119 строки
2.5 KiB
C
/*
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* Load Analog Devices SigmaStudio firmware files
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*
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* Copyright 2009-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/crc32.h>
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#include <linux/delay.h>
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#include <linux/firmware.h>
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/sigma.h>
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/* Return: 0==OK, <0==error, =1 ==no more actions */
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static int
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process_sigma_action(struct i2c_client *client, struct sigma_firmware *ssfw)
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{
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struct sigma_action *sa = (void *)(ssfw->fw->data + ssfw->pos);
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size_t len = sigma_action_len(sa);
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int ret = 0;
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pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__,
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sa->instr, sa->addr, len);
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switch (sa->instr) {
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case SIGMA_ACTION_WRITEXBYTES:
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case SIGMA_ACTION_WRITESINGLE:
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case SIGMA_ACTION_WRITESAFELOAD:
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if (ssfw->fw->size < ssfw->pos + len)
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return -EINVAL;
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ret = i2c_master_send(client, (void *)&sa->addr, len);
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if (ret < 0)
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return -EINVAL;
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break;
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case SIGMA_ACTION_DELAY:
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ret = 0;
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udelay(len);
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len = 0;
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break;
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case SIGMA_ACTION_END:
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return 1;
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default:
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return -EINVAL;
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}
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/* when arrive here ret=0 or sent data */
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ssfw->pos += sigma_action_size(sa, len);
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return ssfw->pos == ssfw->fw->size;
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}
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static int
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process_sigma_actions(struct i2c_client *client, struct sigma_firmware *ssfw)
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{
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pr_debug("%s: processing %p\n", __func__, ssfw);
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while (1) {
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int ret = process_sigma_action(client, ssfw);
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pr_debug("%s: action returned %i\n", __func__, ret);
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if (ret == 1)
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return 0;
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else if (ret)
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return ret;
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}
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}
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int process_sigma_firmware(struct i2c_client *client, const char *name)
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{
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int ret;
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struct sigma_firmware_header *ssfw_head;
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struct sigma_firmware ssfw;
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const struct firmware *fw;
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u32 crc;
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pr_debug("%s: loading firmware %s\n", __func__, name);
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/* first load the blob */
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ret = request_firmware(&fw, name, &client->dev);
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if (ret) {
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pr_debug("%s: request_firmware() failed with %i\n", __func__, ret);
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return ret;
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}
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ssfw.fw = fw;
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/* then verify the header */
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ret = -EINVAL;
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if (fw->size < sizeof(*ssfw_head))
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goto done;
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ssfw_head = (void *)fw->data;
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if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic)))
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goto done;
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crc = crc32(0, fw->data, fw->size);
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pr_debug("%s: crc=%x\n", __func__, crc);
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if (crc != ssfw_head->crc)
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goto done;
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ssfw.pos = sizeof(*ssfw_head);
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/* finally process all of the actions */
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ret = process_sigma_actions(client, &ssfw);
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done:
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release_firmware(fw);
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pr_debug("%s: loaded %s\n", __func__, name);
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return ret;
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}
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EXPORT_SYMBOL(process_sigma_firmware);
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MODULE_LICENSE("GPL");
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