diff options
Diffstat (limited to 'drivers/misc/eeprom')
| -rw-r--r-- | drivers/misc/eeprom/at24.c | 71 | ||||
| -rw-r--r-- | drivers/misc/eeprom/at25.c | 61 |
2 files changed, 102 insertions, 30 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index d4775528abc6..db39f4a52f53 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -53,6 +53,7 @@ struct at24_data { struct at24_platform_data chip; + struct memory_accessor macc; bool use_smbus; /* @@ -225,14 +226,11 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf, return status; } -static ssize_t at24_bin_read(struct kobject *kobj, struct bin_attribute *attr, +static ssize_t at24_read(struct at24_data *at24, char *buf, loff_t off, size_t count) { - struct at24_data *at24; ssize_t retval = 0; - at24 = dev_get_drvdata(container_of(kobj, struct device, kobj)); - if (unlikely(!count)) return count; @@ -262,12 +260,14 @@ static ssize_t at24_bin_read(struct kobject *kobj, struct bin_attribute *attr, return retval; } +static ssize_t at24_bin_read(struct kobject *kobj, struct bin_attribute *attr, + char *buf, loff_t off, size_t count) +{ + struct at24_data *at24; -/* - * REVISIT: export at24_bin{read,write}() to let other kernel code use - * eeprom data. For example, it might hold a board's Ethernet address, or - * board-specific calibration data generated on the manufacturing floor. - */ + at24 = dev_get_drvdata(container_of(kobj, struct device, kobj)); + return at24_read(at24, buf, off, count); +} /* @@ -278,7 +278,7 @@ static ssize_t at24_bin_read(struct kobject *kobj, struct bin_attribute *attr, * We only use page mode writes; the alternative is sloooow. This routine * writes at most one page. */ -static ssize_t at24_eeprom_write(struct at24_data *at24, char *buf, +static ssize_t at24_eeprom_write(struct at24_data *at24, const char *buf, unsigned offset, size_t count) { struct i2c_client *client; @@ -347,14 +347,11 @@ static ssize_t at24_eeprom_write(struct at24_data *at24, char *buf, return -ETIMEDOUT; } -static ssize_t at24_bin_write(struct kobject *kobj, struct bin_attribute *attr, - char *buf, loff_t off, size_t count) +static ssize_t at24_write(struct at24_data *at24, const char *buf, loff_t off, + size_t count) { - struct at24_data *at24; ssize_t retval = 0; - at24 = dev_get_drvdata(container_of(kobj, struct device, kobj)); - if (unlikely(!count)) return count; @@ -384,6 +381,39 @@ static ssize_t at24_bin_write(struct kobject *kobj, struct bin_attribute *attr, return retval; } +static ssize_t at24_bin_write(struct kobject *kobj, struct bin_attribute *attr, + char *buf, loff_t off, size_t count) +{ + struct at24_data *at24; + + at24 = dev_get_drvdata(container_of(kobj, struct device, kobj)); + return at24_write(at24, buf, off, count); +} + +/*-------------------------------------------------------------------------*/ + +/* + * This lets other kernel code access the eeprom data. For example, it + * might hold a board's Ethernet address, or board-specific calibration + * data generated on the manufacturing floor. + */ + +static ssize_t at24_macc_read(struct memory_accessor *macc, char *buf, + off_t offset, size_t count) +{ + struct at24_data *at24 = container_of(macc, struct at24_data, macc); + + return at24_read(at24, buf, offset, count); +} + +static ssize_t at24_macc_write(struct memory_accessor *macc, const char *buf, + off_t offset, size_t count) +{ + struct at24_data *at24 = container_of(macc, struct at24_data, macc); + + return at24_write(at24, buf, offset, count); +} + /*-------------------------------------------------------------------------*/ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) @@ -413,6 +443,9 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) * is recommended anyhow. */ chip.page_size = 1; + + chip.setup = NULL; + chip.context = NULL; } if (!is_power_of_2(chip.byte_len)) @@ -463,6 +496,8 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) at24->bin.read = at24_bin_read; at24->bin.size = chip.byte_len; + at24->macc.read = at24_macc_read; + writable = !(chip.flags & AT24_FLAG_READONLY); if (writable) { if (!use_smbus || i2c_check_functionality(client->adapter, @@ -470,6 +505,8 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) unsigned write_max = chip.page_size; + at24->macc.write = at24_macc_write; + at24->bin.write = at24_bin_write; at24->bin.attr.mode |= S_IWUSR; @@ -520,6 +557,10 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) at24->write_max, use_smbus ? ", use_smbus" : ""); + /* export data to kernel code */ + if (chip.setup) + chip.setup(&at24->macc, chip.context); + return 0; err_clients: diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c index 290dbe99647a..b34cb5f79eea 100644 --- a/drivers/misc/eeprom/at25.c +++ b/drivers/misc/eeprom/at25.c @@ -30,6 +30,7 @@ struct at25_data { struct spi_device *spi; + struct memory_accessor mem; struct mutex lock; struct spi_eeprom chip; struct bin_attribute bin; @@ -75,6 +76,13 @@ at25_ee_read( struct spi_transfer t[2]; struct spi_message m; + if (unlikely(offset >= at25->bin.size)) + return 0; + if ((offset + count) > at25->bin.size) + count = at25->bin.size - offset; + if (unlikely(!count)) + return count; + cp = command; *cp++ = AT25_READ; @@ -127,25 +135,26 @@ at25_bin_read(struct kobject *kobj, struct bin_attribute *bin_attr, dev = container_of(kobj, struct device, kobj); at25 = dev_get_drvdata(dev); - if (unlikely(off >= at25->bin.size)) - return 0; - if ((off + count) > at25->bin.size) - count = at25->bin.size - off; - if (unlikely(!count)) - return count; - return at25_ee_read(at25, buf, off, count); } static ssize_t -at25_ee_write(struct at25_data *at25, char *buf, loff_t off, size_t count) +at25_ee_write(struct at25_data *at25, const char *buf, loff_t off, + size_t count) { ssize_t status = 0; unsigned written = 0; unsigned buf_size; u8 *bounce; + if (unlikely(off >= at25->bin.size)) + return -EFBIG; + if ((off + count) > at25->bin.size) + count = at25->bin.size - off; + if (unlikely(!count)) + return count; + /* Temp buffer starts with command and address */ buf_size = at25->chip.page_size; if (buf_size > io_limit) @@ -253,18 +262,31 @@ at25_bin_write(struct kobject *kobj, struct bin_attribute *bin_attr, dev = container_of(kobj, struct device, kobj); at25 = dev_get_drvdata(dev); - if (unlikely(off >= at25->bin.size)) - return -EFBIG; - if ((off + count) > at25->bin.size) - count = at25->bin.size - off; - if (unlikely(!count)) - return count; - return at25_ee_write(at25, buf, off, count); } /*-------------------------------------------------------------------------*/ +/* Let in-kernel code access the eeprom data. */ + +static ssize_t at25_mem_read(struct memory_accessor *mem, char *buf, + off_t offset, size_t count) +{ + struct at25_data *at25 = container_of(mem, struct at25_data, mem); + + return at25_ee_read(at25, buf, offset, count); +} + +static ssize_t at25_mem_write(struct memory_accessor *mem, const char *buf, + off_t offset, size_t count) +{ + struct at25_data *at25 = container_of(mem, struct at25_data, mem); + + return at25_ee_write(at25, buf, offset, count); +} + +/*-------------------------------------------------------------------------*/ + static int at25_probe(struct spi_device *spi) { struct at25_data *at25 = NULL; @@ -317,6 +339,10 @@ static int at25_probe(struct spi_device *spi) at25->addrlen = addrlen; /* Export the EEPROM bytes through sysfs, since that's convenient. + * And maybe to other kernel code; it might hold a board's Ethernet + * address, or board-specific calibration data generated on the + * manufacturing floor. + * * Default to root-only access to the data; EEPROMs often hold data * that's sensitive for read and/or write, like ethernet addresses, * security codes, board-specific manufacturing calibrations, etc. @@ -324,17 +350,22 @@ static int at25_probe(struct spi_device *spi) at25->bin.attr.name = "eeprom"; at25->bin.attr.mode = S_IRUSR; at25->bin.read = at25_bin_read; + at25->mem.read = at25_mem_read; at25->bin.size = at25->chip.byte_len; if (!(chip->flags & EE_READONLY)) { at25->bin.write = at25_bin_write; at25->bin.attr.mode |= S_IWUSR; + at25->mem.write = at25_mem_write; } err = sysfs_create_bin_file(&spi->dev.kobj, &at25->bin); if (err) goto fail; + if (chip->setup) + chip->setup(&at25->mem, chip->context); + dev_info(&spi->dev, "%Zd %s %s eeprom%s, pagesize %u\n", (at25->bin.size < 1024) ? at25->bin.size |