WhyCan Forum(哇酷开发者社区)

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< /* Used for Winbond flashes only. */
< #define OPCODE_WINBOND_ID    0x4b    /* Get flash unique id */
< 
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< /* flash unique id probe */
< static int unique_id_prob(struct spi_device *spi, u8 *id)
< {
<     int			tmp;
<     u8			code[5];
< 
<     code[0] = OPCODE_WINBOND_ID;
<     tmp = spi_write_then_read(spi, &code, 5, id, 8);
<     if (tmp < 0) {
<         pr_debug("%s: error %d reading UNIQUE ID\n",
<                 dev_name(&spi->dev), tmp);
<         return tmp;
<     }
<     return 0;
< }
< 
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<     /* show unique id in kernel debug log for w25q64 or w25q128. */
<     if(info->jedec_id == 0xef4017 || info->jedec_id == 0xef4018) {
<         u8 unique_id[8];
<         if(!unique_id_prob(spi, unique_id)) {
<             dev_warn(&spi->dev, "flash id: %02x%02x%02x%02x%02x%02x%02x%02x\n",
<                     unique_id[7], unique_id[6], unique_id[5], unique_id[4],
<                     unique_id[3], unique_id[2], unique_id[1], unique_id[0]);
<         } else {
<             dev_warn(&spi->dev, "failed to get flash unique id.\n");
<         }
<     }
<