From: Jiri Prchal <jiri.prchal@aksignal.cz>
To: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Rob Herring <robh+dt@kernel.org>,
Christian Eggers <ceggers@arri.de>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Prchal <jiri.prchal@aksignal.cz>
Subject: [PATCH v8 4/5] nvmem: eeprom: at25: export FRAM serial num
Date: Mon, 7 Jun 2021 18:12:00 +0200 [thread overview]
Message-ID: <20210607161201.223697-5-jiri.prchal@aksignal.cz> (raw)
In-Reply-To: <20210607161201.223697-1-jiri.prchal@aksignal.cz>
This exports serial number of FRAM in sysfs file named "sernum".
Formatted in hex, each byte separated by space.
Example:
$ cat /sys/class/spi_master/spi0/spi0.0/sernum
0000a43644f2ae6c
Signed-off-by: Jiri Prchal <jiri.prchal@aksignal.cz>
---
v2: no change here
v3: resend and added more recipients
v4: resend
v5: reworked up on Greg comments: no spaces in string, sysfs done correctly
v6: no change here
v7: moved FM25_SN_LEN, static array, used sysfs_emit, DEVICE_ATTR_RO
v8: clarify sysfs_emit format
---
drivers/misc/eeprom/at25.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c
index e25cec7c474b..4a47a7e2d90d 100644
--- a/drivers/misc/eeprom/at25.c
+++ b/drivers/misc/eeprom/at25.c
@@ -31,6 +31,7 @@
* AT25M02, AT25128B
*/
+#define FM25_SN_LEN 8 /* serial number length */
struct at25_data {
struct spi_device *spi;
struct mutex lock;
@@ -39,6 +40,7 @@ struct at25_data {
struct nvmem_config nvmem_config;
struct nvmem_device *nvmem;
int has_sernum;
+ u8 sernum[FM25_SN_LEN];
};
#define AT25_WREN 0x06 /* latch the write enable */
@@ -172,6 +174,21 @@ static int fm25_aux_read(struct at25_data *at25, u8 *buf, uint8_t command,
return status;
}
+static ssize_t sernum_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct at25_data *at25;
+
+ at25 = dev_get_drvdata(dev);
+ return sysfs_emit(buf, "%*phN\n", sizeof at25->sernum, at25->sernum);
+}
+static DEVICE_ATTR_RO(sernum);
+
+static struct attribute *sernum_attrs[] = {
+ &dev_attr_sernum.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(sernum);
+
static int at25_ee_write(void *priv, unsigned int off, void *val, size_t count)
{
struct at25_data *at25 = priv;
@@ -416,8 +433,10 @@ static int at25_probe(struct spi_device *spi)
else
at25->chip.flags |= EE_ADDR2;
- if (id[8])
+ if (id[8]) {
at25->has_sernum = 1;
+ fm25_aux_read(at25, at25->sernum, FM25_RDSN, FM25_SN_LEN);
+ }
else
at25->has_sernum = 0;
@@ -471,6 +490,7 @@ static struct spi_driver at25_driver = {
.driver = {
.name = "at25",
.of_match_table = at25_of_match,
+ .dev_groups = sernum_groups,
},
.probe = at25_probe,
};
--
2.25.1
next prev parent reply other threads:[~2021-06-07 16:12 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 16:11 [PATCH v8 0/5] add support for FRAM Jiri Prchal
2021-06-07 16:11 ` [PATCH v8 1/5] nvmem: prepare basics for FRAM support Jiri Prchal
2021-06-07 16:11 ` [PATCH v8 2/5] nvmem: eeprom: at25: add support for FRAM Jiri Prchal
2021-06-08 9:07 ` Greg Kroah-Hartman
2021-06-08 9:57 ` Jiří Prchal
2021-06-07 16:11 ` [PATCH v8 3/5] dt-bindings: nvmem: at25: add for FRAM support Jiri Prchal
2021-06-07 16:12 ` Jiri Prchal [this message]
2021-06-08 9:05 ` [PATCH v8 4/5] nvmem: eeprom: at25: export FRAM serial num Greg Kroah-Hartman
2021-06-07 16:12 ` [PATCH v8 5/5] nvmem: eeprom: add documentation of sysfs fram and sernum file Jiri Prchal
2021-06-08 9:05 ` Greg Kroah-Hartman
2021-06-08 9:50 ` Jiří Prchal
2021-06-08 10:04 ` Greg Kroah-Hartman
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