The patch titled
rtc-ds1307 exports NVRAM
has been added to the -mm tree. Its filename is
rtc-ds1307-exports-nvram.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: rtc-ds1307 exports NVRAM
From: David Brownell <david-b@xxxxxxxxxxx>
Export the NVRAM on DS1307 and DS1338 chips, like several of the
other drivers do for such combination RTC-and-NVRAM chips.
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Acked-by: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/rtc/Kconfig | 4 -
drivers/rtc/rtc-ds1307.c | 93 +++++++++++++++++++++++++++++++++++++
2 files changed, 95 insertions(+), 2 deletions(-)
diff -puN drivers/rtc/Kconfig~rtc-ds1307-exports-nvram drivers/rtc/Kconfig
--- a/drivers/rtc/Kconfig~rtc-ds1307-exports-nvram
+++ a/drivers/rtc/Kconfig
@@ -135,8 +135,8 @@ config RTC_DRV_DS1307
The first seven registers on these chips hold an RTC, and other
registers may add features such as NVRAM, a trickle charger for
- the RTC/NVRAM backup power, and alarms. This driver may not
- expose all those available chip features.
+ the RTC/NVRAM backup power, and alarms. NVRAM is visible in
+ sysfs, but other chip features may not be available.
This driver can also be built as a module. If so, the module
will be called rtc-ds1307.
diff -puN drivers/rtc/rtc-ds1307.c~rtc-ds1307-exports-nvram drivers/rtc/rtc-ds1307.c
--- a/drivers/rtc/rtc-ds1307.c~rtc-ds1307-exports-nvram
+++ a/drivers/rtc/rtc-ds1307.c
@@ -89,6 +89,7 @@ enum ds_type {
struct ds1307 {
u8 reg_addr;
+ bool has_nvram;
u8 regs[8];
enum ds_type type;
struct i2c_msg msg[2];
@@ -242,6 +243,87 @@ static const struct rtc_class_ops ds13xx
.set_time = ds1307_set_time,
};
+/*----------------------------------------------------------------------*/
+
+#define NVRAM_SIZE 56
+
+static ssize_t
+ds1307_nvram_read(struct kobject *kobj, struct bin_attribute *attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct i2c_client *client;
+ struct ds1307 *ds1307;
+ struct i2c_msg msg[2];
+ int result;
+
+ client = to_i2c_client(container_of(kobj, struct device, kobj));
+ ds1307 = i2c_get_clientdata(client);
+
+ if (unlikely(off >= NVRAM_SIZE))
+ return 0;
+ if ((off + count) > NVRAM_SIZE)
+ count = NVRAM_SIZE - off;
+ if (unlikely(!count))
+ return count;
+
+ msg[0].addr = client->addr;
+ msg[0].flags = 0;
+ msg[0].len = 1;
+ msg[0].buf = buf;
+
+ buf[0] = 8 + off;
+
+ msg[1].addr = client->addr;
+ msg[1].flags = I2C_M_RD;
+ msg[1].len = count;
+ msg[1].buf = buf;
+
+ result = i2c_transfer(to_i2c_adapter(client->dev.parent), msg, 2);
+ if (result != 2) {
+ dev_err(&client->dev, "%s error %d\n", "nvram read", result);
+ return -EIO;
+ }
+ return count;
+}
+
+static ssize_t
+ds1307_nvram_write(struct kobject *kobj, struct bin_attribute *attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct i2c_client *client;
+ u8 buffer[NVRAM_SIZE + 1];
+ int ret;
+
+ client = to_i2c_client(container_of(kobj, struct device, kobj));
+
+ if (unlikely(off >= NVRAM_SIZE))
+ return -EFBIG;
+ if ((off + count) > NVRAM_SIZE)
+ count = NVRAM_SIZE - off;
+ if (unlikely(!count))
+ return count;
+
+ buffer[0] = 8 + off;
+ memcpy(buffer + 1, buf, count);
+
+ ret = i2c_master_send(client, buffer, count + 1);
+ return (ret < 0) ? ret : (ret - 1);
+}
+
+static struct bin_attribute nvram = {
+ .attr = {
+ .name = "nvram",
+ .mode = S_IRUGO | S_IWUSR,
+ .owner = THIS_MODULE,
+ },
+
+ .read = ds1307_nvram_read,
+ .write = ds1307_nvram_write,
+ .size = NVRAM_SIZE,
+};
+
+/*----------------------------------------------------------------------*/
+
static struct i2c_driver ds1307_driver;
static int __devinit ds1307_probe(struct i2c_client *client)
@@ -413,6 +495,14 @@ read_rtc:
goto exit_free;
}
+ if (chip->nvram56) {
+ err = sysfs_create_bin_file(&client->dev.kobj, &nvram);
+ if (err == 0) {
+ ds1307->has_nvram = true;
+ dev_info(&client->dev, "56 bytes nvram\n");
+ }
+ }
+
return 0;
exit_bad:
@@ -432,6 +522,9 @@ static int __devexit ds1307_remove(struc
{
struct ds1307 *ds1307 = i2c_get_clientdata(client);
+ if (ds1307->has_nvram)
+ sysfs_remove_bin_file(&client->dev.kobj, &nvram);
+
rtc_device_unregister(ds1307->rtc);
kfree(ds1307);
return 0;
_
Patches currently in -mm which might be from david-b@xxxxxxxxxxx are
origin.patch
rtc-m48t59-fix-section-mismatch-warning.patch
rtc_hctosys-expects-rtcs-in-utc-doc.patch
rtcs-handle-nvram-better.patch
rtc-ds1307-exports-nvram.patch
rtc-dont-write-rtc-century-when-setting-a-wake-alarm.patch
usb-s3c2410_udc-minor-irq-handler-cleanups.patch
pci-add-pci-identifiers-for-the-rdc-devices.patch
x86-add-support-for-the-rdc-r-321x-soc.patch
add-the-rdc-machine-specific-reboot-fixup.patch
rtc-release-correct-region-in-error-path.patch
rtc-fallback-to-requesting-only-the-ports-we-actually-use.patch
tle62x0-driver-stops-ignoring-read-errors.patch
rtc-convert-mutex-to-bitfield.patch
drivers-pmc-msp71xx-gpio-char-driver.patch
remove-pointless-casts-from-void-pointers.patch
spi-at25-driver-is-for-eeprom-not-flash.patch
spi-use-mutex-not-semaphore.patch
blackfin-spi-driver-use-cpu_relax-to-replace-continue-in-while-busywait.patch
blackfin-spi-driver-use-void-__iomem-for-regs_base.patch
blackfin-spi-driver-move-hard-coded-pin_req-to-board-file.patch
blackfin-spi-driver-reconfigure-speed_hz-and-bits_per_word-in-each-spi-transfer.patch
cosmetic-fixes-to-rtc-subsystems-kconfig.patch
rtc-pcf8583-dont-abuse-i2c_m_nostart.patch
pnp-request-ioport-and-iomem-resources-used-by-active-devices.patch
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