rtc-ds1307: SMBus compatibility
Change i2c access functions to SMBus access functions in order to use the
ds1307 with SMBus adapter.
Signed-off-by: Sebastien Barre <sbarre@sdelcc.com>
Acked-by: David Brownell <david-b@pacbell.net>
Tested-by: David Brownell <david-b@pacbell.net>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Acked-by: Jean Delvare <khali@linux-fr.org>
Cc: Rodolfo Giometti <giometti@enneenne.com>
Tested-by: Sebastien Barre <sbarre@sdelcc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 162330b..fec13e7 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -86,13 +86,11 @@
struct ds1307 {
- u8 reg_addr;
u8 regs[11];
enum ds_type type;
unsigned long flags;
#define HAS_NVRAM 0 /* bit 0 == sysfs file active */
#define HAS_ALARM 1 /* bit 1 == irq claimed */
- struct i2c_msg msg[2];
struct i2c_client *client;
struct rtc_device *rtc;
struct work_struct work;
@@ -204,13 +202,9 @@
int tmp;
/* read the RTC date and time registers all at once */
- ds1307->reg_addr = 0;
- ds1307->msg[1].flags = I2C_M_RD;
- ds1307->msg[1].len = 7;
-
- tmp = i2c_transfer(to_i2c_adapter(ds1307->client->dev.parent),
- ds1307->msg, 2);
- if (tmp != 2) {
+ tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
+ DS1307_REG_SECS, 7, ds1307->regs);
+ if (tmp != 7) {
dev_err(dev, "%s error %d\n", "read", tmp);
return -EIO;
}
@@ -257,7 +251,6 @@
t->tm_hour, t->tm_mday,
t->tm_mon, t->tm_year, t->tm_wday);
- *buf++ = 0; /* first register addr */
buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec);
buf[DS1307_REG_MIN] = bin2bcd(t->tm_min);
buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour);
@@ -282,18 +275,14 @@
break;
}
- ds1307->msg[1].flags = 0;
- ds1307->msg[1].len = 8;
-
dev_dbg(dev, "%s: %02x %02x %02x %02x %02x %02x %02x\n",
"write", buf[0], buf[1], buf[2], buf[3],
buf[4], buf[5], buf[6]);
- result = i2c_transfer(to_i2c_adapter(ds1307->client->dev.parent),
- &ds1307->msg[1], 1);
- if (result != 1) {
- dev_err(dev, "%s error %d\n", "write", tmp);
- return -EIO;
+ result = i2c_smbus_write_i2c_block_data(ds1307->client, 0, 7, buf);
+ if (result < 0) {
+ dev_err(dev, "%s error %d\n", "write", result);
+ return result;
}
return 0;
}
@@ -308,13 +297,9 @@
return -EINVAL;
/* read all ALARM1, ALARM2, and status registers at once */
- ds1307->reg_addr = DS1339_REG_ALARM1_SECS;
- ds1307->msg[1].flags = I2C_M_RD;
- ds1307->msg[1].len = 9;
-
- ret = i2c_transfer(to_i2c_adapter(client->dev.parent),
- ds1307->msg, 2);
- if (ret != 2) {
+ ret = i2c_smbus_read_i2c_block_data(client,
+ DS1339_REG_ALARM1_SECS, 9, ds1307->regs);
+ if (ret != 9) {
dev_err(dev, "%s error %d\n", "alarm read", ret);
return -EIO;
}
@@ -371,13 +356,9 @@
t->enabled, t->pending);
/* read current status of both alarms and the chip */
- ds1307->reg_addr = DS1339_REG_ALARM1_SECS;
- ds1307->msg[1].flags = I2C_M_RD;
- ds1307->msg[1].len = 9;
-
- ret = i2c_transfer(to_i2c_adapter(client->dev.parent),
- ds1307->msg, 2);
- if (ret != 2) {
+ ret = i2c_smbus_read_i2c_block_data(client,
+ DS1339_REG_ALARM1_SECS, 9, buf);
+ if (ret != 9) {
dev_err(dev, "%s error %d\n", "alarm write", ret);
return -EIO;
}
@@ -392,7 +373,6 @@
ds1307->regs[6], control, status);
/* set ALARM1, using 24 hour and day-of-month modes */
- *buf++ = DS1339_REG_ALARM1_SECS; /* first register addr */
buf[0] = bin2bcd(t->time.tm_sec);
buf[1] = bin2bcd(t->time.tm_min);
buf[2] = bin2bcd(t->time.tm_hour);
@@ -411,14 +391,11 @@
}
buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
- ds1307->msg[1].flags = 0;
- ds1307->msg[1].len = 10;
-
- ret = i2c_transfer(to_i2c_adapter(client->dev.parent),
- &ds1307->msg[1], 1);
- if (ret != 1) {
+ ret = i2c_smbus_write_i2c_block_data(client,
+ DS1339_REG_ALARM1_SECS, 9, buf);
+ if (ret < 0) {
dev_err(dev, "can't set alarm time\n");
- return -EIO;
+ return ret;
}
return 0;
@@ -490,7 +467,6 @@
{
struct i2c_client *client;
struct ds1307 *ds1307;
- struct i2c_msg msg[2];
int result;
client = kobj_to_i2c_client(kobj);
@@ -503,24 +479,10 @@
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) {
+ result = i2c_smbus_read_i2c_block_data(client, 8 + off, count, buf);
+ if (result < 0)
dev_err(&client->dev, "%s error %d\n", "nvram read", result);
- return -EIO;
- }
- return count;
+ return result;
}
static ssize_t
@@ -528,8 +490,7 @@
char *buf, loff_t off, size_t count)
{
struct i2c_client *client;
- u8 buffer[NVRAM_SIZE + 1];
- int ret;
+ int result;
client = kobj_to_i2c_client(kobj);
@@ -540,11 +501,12 @@
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);
+ result = i2c_smbus_write_i2c_block_data(client, 8 + off, count, buf);
+ if (result < 0) {
+ dev_err(&client->dev, "%s error %d\n", "nvram write", result);
+ return result;
+ }
+ return count;
}
static struct bin_attribute nvram = {
@@ -571,9 +533,11 @@
const struct chip_desc *chip = &chips[id->driver_data];
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
int want_irq = false;
+ unsigned char *buf;
if (!i2c_check_functionality(adapter,
- I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
+ I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK))
return -EIO;
if (!(ds1307 = kzalloc(sizeof(struct ds1307), GFP_KERNEL)))
@@ -581,18 +545,8 @@
ds1307->client = client;
i2c_set_clientdata(client, ds1307);
-
- ds1307->msg[0].addr = client->addr;
- ds1307->msg[0].flags = 0;
- ds1307->msg[0].len = 1;
- ds1307->msg[0].buf = &ds1307->reg_addr;
-
- ds1307->msg[1].addr = client->addr;
- ds1307->msg[1].flags = I2C_M_RD;
- ds1307->msg[1].len = sizeof(ds1307->regs);
- ds1307->msg[1].buf = ds1307->regs;
-
ds1307->type = id->driver_data;
+ buf = ds1307->regs;
switch (ds1307->type) {
case ds_1337:
@@ -602,21 +556,15 @@
INIT_WORK(&ds1307->work, ds1307_work);
want_irq = true;
}
-
- ds1307->reg_addr = DS1337_REG_CONTROL;
- ds1307->msg[1].len = 2;
-
/* get registers that the "rtc" read below won't read... */
- tmp = i2c_transfer(adapter, ds1307->msg, 2);
+ tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
+ DS1337_REG_CONTROL, 2, buf);
if (tmp != 2) {
pr_debug("read error %d\n", tmp);
err = -EIO;
goto exit_free;
}
- ds1307->reg_addr = 0;
- ds1307->msg[1].len = sizeof(ds1307->regs);
-
/* oscillator off? turn it on, so clock can tick. */
if (ds1307->regs[0] & DS1337_BIT_nEOSC)
ds1307->regs[0] &= ~DS1337_BIT_nEOSC;
@@ -647,9 +595,8 @@
read_rtc:
/* read RTC registers */
-
- tmp = i2c_transfer(adapter, ds1307->msg, 2);
- if (tmp != 2) {
+ tmp = i2c_smbus_read_i2c_block_data(ds1307->client, 0, 8, buf);
+ if (tmp != 8) {
pr_debug("read error %d\n", tmp);
err = -EIO;
goto exit_free;