diff options
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/eeprom/at25.c | 85 |
1 files changed, 44 insertions, 41 deletions
diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c index c9660a4625ce..b9d26c9ee768 100644 --- a/drivers/misc/eeprom/at25.c +++ b/drivers/misc/eeprom/at25.c @@ -31,9 +31,9 @@ #define FM25_SN_LEN 8 /* serial number length */ struct at25_data { + struct spi_eeprom chip; struct spi_device *spi; struct mutex lock; - struct spi_eeprom chip; unsigned addrlen; struct nvmem_config nvmem_config; struct nvmem_device *nvmem; @@ -360,6 +360,44 @@ static int at25_fw_to_chip(struct device *dev, struct spi_eeprom *chip) return 0; } +static int at25_fram_to_chip(struct device *dev, struct spi_eeprom *chip) +{ + struct at25_data *at25 = container_of(chip, struct at25_data, chip); + u8 sernum[FM25_SN_LEN]; + u8 id[FM25_ID_LEN]; + int i; + + strncpy(chip->name, "fm25", sizeof(chip->name)); + + /* Get ID of chip */ + fm25_aux_read(at25, id, FM25_RDID, FM25_ID_LEN); + if (id[6] != 0xc2) { + dev_err(dev, "Error: no Cypress FRAM (id %02x)\n", id[6]); + return -ENODEV; + } + /* Set size found in ID */ + if (id[7] < 0x21 || id[7] > 0x26) { + dev_err(dev, "Error: unsupported size (id %02x)\n", id[7]); + return -ENODEV; + } + + chip->byte_len = BIT(id[7] - 0x21 + 4) * 1024; + if (chip->byte_len > 64 * 1024) + chip->flags |= EE_ADDR3; + else + chip->flags |= EE_ADDR2; + + if (id[8]) { + fm25_aux_read(at25, sernum, FM25_RDSN, FM25_SN_LEN); + /* Swap byte order */ + for (i = 0; i < FM25_SN_LEN; i++) + at25->sernum[i] = sernum[FM25_SN_LEN - 1 - i]; + } + + chip->page_size = PAGE_SIZE; + return 0; +} + static const struct of_device_id at25_of_match[] = { { .compatible = "atmel,at25",}, { .compatible = "cypress,fm25",}, @@ -380,10 +418,7 @@ static int at25_probe(struct spi_device *spi) int err; int sr; struct spi_eeprom *pdata; - u8 id[FM25_ID_LEN]; - u8 sernum[FM25_SN_LEN]; bool is_fram; - int i; err = device_property_match_string(&spi->dev, "compatible", "cypress,fm25"); if (err >= 0) @@ -414,44 +449,12 @@ static int at25_probe(struct spi_device *spi) if (pdata) { at25->chip = *pdata; } else { - if (is_fram) { - /* We file fields for FRAM case later on */ - } else { - err = at25_fw_to_chip(&spi->dev, &at25->chip); - if (err) - return err; - } - } - - if (is_fram) { - /* Get ID of chip */ - fm25_aux_read(at25, id, FM25_RDID, FM25_ID_LEN); - if (id[6] != 0xc2) { - dev_err(&spi->dev, - "Error: no Cypress FRAM (id %02x)\n", id[6]); - return -ENODEV; - } - /* set size found in ID */ - if (id[7] < 0x21 || id[7] > 0x26) { - dev_err(&spi->dev, "Error: unsupported size (id %02x)\n", id[7]); - return -ENODEV; - } - - at25->chip.byte_len = BIT(id[7] - 0x21 + 4) * 1024; - if (at25->chip.byte_len > 64 * 1024) - at25->chip.flags |= EE_ADDR3; + if (is_fram) + err = at25_fram_to_chip(&spi->dev, &at25->chip); else - at25->chip.flags |= EE_ADDR2; - - if (id[8]) { - fm25_aux_read(at25, sernum, FM25_RDSN, FM25_SN_LEN); - /* swap byte order */ - for (i = 0; i < FM25_SN_LEN; i++) - at25->sernum[i] = sernum[FM25_SN_LEN - 1 - i]; - } - - at25->chip.page_size = PAGE_SIZE; - strncpy(at25->chip.name, "fm25", sizeof(at25->chip.name)); + err = at25_fw_to_chip(&spi->dev, &at25->chip); + if (err) + return err; } /* For now we only support 8/16/24 bit addressing */ |