| Mike Frysinger | e359dc2 | 2011-03-22 16:34:40 -0700 | [diff] [blame] | 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> |
| 14 | #include <linux/sigma.h> |
| 15 | |
| 16 | /* Return: 0==OK, <0==error, =1 ==no more actions */ |
| 17 | static int |
| 18 | process_sigma_action(struct i2c_client *client, struct sigma_firmware *ssfw) |
| 19 | { |
| 20 | struct sigma_action *sa = (void *)(ssfw->fw->data + ssfw->pos); |
| 21 | size_t len = sigma_action_len(sa); |
| 22 | int ret = 0; |
| 23 | |
| 24 | pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__, |
| 25 | sa->instr, sa->addr, len); |
| 26 | |
| 27 | switch (sa->instr) { |
| 28 | case SIGMA_ACTION_WRITEXBYTES: |
| 29 | case SIGMA_ACTION_WRITESINGLE: |
| 30 | case SIGMA_ACTION_WRITESAFELOAD: |
| 31 | if (ssfw->fw->size < ssfw->pos + len) |
| 32 | return -EINVAL; |
| 33 | ret = i2c_master_send(client, (void *)&sa->addr, len); |
| 34 | if (ret < 0) |
| 35 | return -EINVAL; |
| 36 | break; |
| 37 | |
| 38 | case SIGMA_ACTION_DELAY: |
| 39 | ret = 0; |
| 40 | udelay(len); |
| 41 | len = 0; |
| 42 | break; |
| 43 | |
| 44 | case SIGMA_ACTION_END: |
| 45 | return 1; |
| 46 | |
| 47 | default: |
| 48 | return -EINVAL; |
| 49 | } |
| 50 | |
| 51 | /* when arrive here ret=0 or sent data */ |
| 52 | ssfw->pos += sigma_action_size(sa, len); |
| 53 | return ssfw->pos == ssfw->fw->size; |
| 54 | } |
| 55 | |
| 56 | static int |
| 57 | process_sigma_actions(struct i2c_client *client, struct sigma_firmware *ssfw) |
| 58 | { |
| 59 | pr_debug("%s: processing %p\n", __func__, ssfw); |
| 60 | |
| 61 | while (1) { |
| 62 | int ret = process_sigma_action(client, ssfw); |
| 63 | pr_debug("%s: action returned %i\n", __func__, ret); |
| 64 | if (ret == 1) |
| 65 | return 0; |
| 66 | else if (ret) |
| 67 | return ret; |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | int process_sigma_firmware(struct i2c_client *client, const char *name) |
| 72 | { |
| 73 | int ret; |
| 74 | struct sigma_firmware_header *ssfw_head; |
| 75 | struct sigma_firmware ssfw; |
| 76 | const struct firmware *fw; |
| 77 | u32 crc; |
| 78 | |
| 79 | pr_debug("%s: loading firmware %s\n", __func__, name); |
| 80 | |
| 81 | /* first load the blob */ |
| 82 | ret = request_firmware(&fw, name, &client->dev); |
| 83 | if (ret) { |
| 84 | pr_debug("%s: request_firmware() failed with %i\n", __func__, ret); |
| 85 | return ret; |
| 86 | } |
| 87 | ssfw.fw = fw; |
| 88 | |
| 89 | /* then verify the header */ |
| 90 | ret = -EINVAL; |
| 91 | if (fw->size < sizeof(*ssfw_head)) |
| 92 | goto done; |
| 93 | |
| 94 | ssfw_head = (void *)fw->data; |
| 95 | if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic))) |
| 96 | goto done; |
| 97 | |
| 98 | crc = crc32(0, fw->data, fw->size); |
| 99 | pr_debug("%s: crc=%x\n", __func__, crc); |
| 100 | if (crc != ssfw_head->crc) |
| 101 | goto done; |
| 102 | |
| 103 | ssfw.pos = sizeof(*ssfw_head); |
| 104 | |
| 105 | /* finally process all of the actions */ |
| 106 | ret = process_sigma_actions(client, &ssfw); |
| 107 | |
| 108 | done: |
| 109 | release_firmware(fw); |
| 110 | |
| 111 | pr_debug("%s: loaded %s\n", __func__, name); |
| 112 | |
| 113 | return ret; |
| 114 | } |
| 115 | EXPORT_SYMBOL(process_sigma_firmware); |