From patchwork Tue Nov 24 09:44:41 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 57215 Delivered-To: patch@linaro.org Received: by 10.112.155.196 with SMTP id vy4csp1973518lbb; Tue, 24 Nov 2015 01:47:13 -0800 (PST) X-Received: by 10.68.101.97 with SMTP id ff1mr41957237pbb.166.1448358432921; Tue, 24 Nov 2015 01:47:12 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. 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Export the serial number through sysfs. Signed-off-by: Bartosz Golaszewski --- drivers/misc/eeprom/at24.c | 44 ++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 40 insertions(+), 4 deletions(-) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 6182f47..65fca1e 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -65,6 +65,7 @@ struct at24_data { */ struct mutex lock; struct bin_attribute bin; + struct bin_attribute *bin_serial; u8 *writebuf; unsigned write_max; @@ -103,6 +104,7 @@ MODULE_PARM_DESC(write_timeout, "Time (in ms) to try writes (default 25)"); #define AT24_BITMASK(x) (BIT(x) - 1) +#define AT24CS_SERIAL_SIZE 16 #define AT24CS_SERIAL_ADDR(addr) (addr + 0x08) /* create non-zero magic value for given eeprom parameters */ @@ -163,10 +165,8 @@ static struct i2c_client *at24_translate_offset(struct at24_data *at24, return at24->client[i]; } -static int __attribute__((unused)) at24cs_eeprom_serial_read( - struct at24_data *at24, - char *buf, unsigned offset, - size_t count) +static int at24cs_eeprom_serial_read(struct at24_data *at24, char *buf, + unsigned offset, size_t count) { unsigned long timeout, read_time; struct i2c_client *client; @@ -234,6 +234,16 @@ static int __attribute__((unused)) at24cs_eeprom_serial_read( return -ETIMEDOUT; } +static ssize_t at24cs_bin_serial_read(struct file *filp, 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 at24cs_eeprom_serial_read(at24, buf, off, count); +} + static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf, unsigned offset, size_t count) { @@ -658,6 +668,30 @@ 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; + if (at24->chip.flags & AT24_FLAG_SERIAL) { + /* + * For EEPROMs containing the serial number export an + * additional file allowing allowing convenvient access + * to it from user-space. + */ + at24->bin_serial = devm_kzalloc(&client->dev, + sizeof(struct bin_attribute), + GFP_KERNEL); + if (!at24->bin_serial) + return -ENOMEM; + + sysfs_bin_attr_init(at24->bin_serial); + at24->bin_serial->attr.name = "serial"; + at24->bin_serial->attr.mode = S_IRUSR; + at24->bin_serial->read = at24cs_bin_serial_read; + at24->bin_serial->size = AT24CS_SERIAL_SIZE; + + err = sysfs_create_bin_file(&client->dev.kobj, + at24->bin_serial); + if (err) + goto err_clients; + } + at24->macc.read = at24_macc_read; writable = !(chip.flags & AT24_FLAG_READONLY); @@ -757,6 +791,8 @@ static int at24_remove(struct i2c_client *client) at24 = i2c_get_clientdata(client); sysfs_remove_bin_file(&client->dev.kobj, &at24->bin); + if (at24->bin_serial) + sysfs_remove_bin_file(&client->dev.kobj, at24->bin_serial); for (i = 1; i < at24->num_addresses; i++) i2c_unregister_device(at24->client[i]);