| Daniel Drake | 370803c | 2012-04-16 23:52:42 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Firmware loading and handling functions. |
| 3 | */ |
| 4 | |
| 5 | #include <linux/firmware.h> |
| 6 | #include <linux/module.h> |
| 7 | |
| 8 | #include "decl.h" |
| 9 | |
| 10 | /** |
| 11 | * lbs_get_firmware - Retrieves two-stage firmware |
| 12 | * |
| 13 | * @dev: A pointer to &device structure |
| 14 | * @card_model: Bus-specific card model ID used to filter firmware table |
| 15 | * elements |
| 16 | * @fw_table: Table of firmware file names and device model numbers |
| 17 | * terminated by an entry with a NULL helper name |
| 18 | * @helper: On success, the helper firmware; caller must free |
| 19 | * @mainfw: On success, the main firmware; caller must free |
| 20 | * |
| 21 | * returns: 0 on success, non-zero on failure |
| 22 | */ |
| 23 | int lbs_get_firmware(struct device *dev, u32 card_model, |
| 24 | const struct lbs_fw_table *fw_table, |
| 25 | const struct firmware **helper, |
| 26 | const struct firmware **mainfw) |
| 27 | { |
| 28 | const struct lbs_fw_table *iter; |
| 29 | int ret; |
| 30 | |
| 31 | BUG_ON(helper == NULL); |
| 32 | BUG_ON(mainfw == NULL); |
| 33 | |
| 34 | /* Search for firmware to use from the table. */ |
| 35 | iter = fw_table; |
| 36 | while (iter && iter->helper) { |
| 37 | if (iter->model != card_model) |
| 38 | goto next; |
| 39 | |
| 40 | if (*helper == NULL) { |
| 41 | ret = request_firmware(helper, iter->helper, dev); |
| 42 | if (ret) |
| 43 | goto next; |
| 44 | |
| 45 | /* If the device has one-stage firmware (ie cf8305) and |
| 46 | * we've got it then we don't need to bother with the |
| 47 | * main firmware. |
| 48 | */ |
| 49 | if (iter->fwname == NULL) |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | if (*mainfw == NULL) { |
| 54 | ret = request_firmware(mainfw, iter->fwname, dev); |
| 55 | if (ret) { |
| 56 | /* Clear the helper to ensure we don't have |
| 57 | * mismatched firmware pairs. |
| 58 | */ |
| 59 | release_firmware(*helper); |
| 60 | *helper = NULL; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | if (*helper && *mainfw) |
| 65 | return 0; |
| 66 | |
| 67 | next: |
| 68 | iter++; |
| 69 | } |
| 70 | |
| 71 | /* Failed */ |
| 72 | release_firmware(*helper); |
| 73 | *helper = NULL; |
| 74 | release_firmware(*mainfw); |
| 75 | *mainfw = NULL; |
| 76 | |
| 77 | return -ENOENT; |
| 78 | } |
| 79 | EXPORT_SYMBOL_GPL(lbs_get_firmware); |