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path: root/drivers/rtc/rtc-rv8803.c
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Diffstat (limited to 'drivers/rtc/rtc-rv8803.c')
-rw-r--r--drivers/rtc/rtc-rv8803.c205
1 files changed, 133 insertions, 72 deletions
diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index f623038e586e..9a2f6a95d5a7 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -13,12 +13,15 @@
#include <linux/bcd.h>
#include <linux/bitops.h>
+#include <linux/log2.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtc.h>
+#define RV8803_I2C_TRY_COUNT 4
+
#define RV8803_SEC 0x00
#define RV8803_MIN 0x01
#define RV8803_HOUR 0x02
@@ -56,19 +59,85 @@ struct rv8803_data {
u8 ctrl;
};
+static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
+{
+ int try = RV8803_I2C_TRY_COUNT;
+ s32 ret;
+
+ /*
+ * There is a 61µs window during which the RTC does not acknowledge I2C
+ * transfers. In that case, ensure that there are multiple attempts.
+ */
+ do
+ ret = i2c_smbus_read_byte_data(client, reg);
+ while ((ret == -ENXIO || ret == -EIO) && --try);
+ if (ret < 0)
+ dev_err(&client->dev, "Unable to read register 0x%02x\n", reg);
+
+ return ret;
+}
+
+static int rv8803_read_regs(const struct i2c_client *client,
+ u8 reg, u8 count, u8 *values)
+{
+ int try = RV8803_I2C_TRY_COUNT;
+ s32 ret;
+
+ do
+ ret = i2c_smbus_read_i2c_block_data(client, reg, count, values);
+ while ((ret == -ENXIO || ret == -EIO) && --try);
+ if (ret != count) {
+ dev_err(&client->dev,
+ "Unable to read registers 0x%02x..0x%02x\n",
+ reg, reg + count - 1);
+ return ret < 0 ? ret : -EIO;
+ }
+
+ return 0;
+}
+
+static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value)
+{
+ int try = RV8803_I2C_TRY_COUNT;
+ s32 ret;
+
+ do
+ ret = i2c_smbus_write_byte_data(client, reg, value);
+ while ((ret == -ENXIO || ret == -EIO) && --try);
+ if (ret)
+ dev_err(&client->dev, "Unable to write register 0x%02x\n", reg);
+
+ return ret;
+}
+
+static int rv8803_write_regs(const struct i2c_client *client,
+ u8 reg, u8 count, const u8 *values)
+{
+ int try = RV8803_I2C_TRY_COUNT;
+ s32 ret;
+
+ do
+ ret = i2c_smbus_write_i2c_block_data(client, reg, count,
+ values);
+ while ((ret == -ENXIO || ret == -EIO) && --try);
+ if (ret)
+ dev_err(&client->dev,
+ "Unable to write registers 0x%02x..0x%02x\n",
+ reg, reg + count - 1);
+
+ return ret;
+}
+
static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
{
struct i2c_client *client = dev_id;
struct rv8803_data *rv8803 = i2c_get_clientdata(client);
unsigned long events = 0;
- int flags, try = 0;
+ int flags;
mutex_lock(&rv8803->flags_lock);
- do {
- flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
- try++;
- } while ((flags == -ENXIO) && (try < 3));
+ flags = rv8803_read_reg(client, RV8803_FLAG);
if (flags <= 0) {
mutex_unlock(&rv8803->flags_lock);
return IRQ_NONE;
@@ -100,9 +169,8 @@ static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
if (events) {
rtc_update_irq(rv8803->rtc, 1, events);
- i2c_smbus_write_byte_data(client, RV8803_FLAG, flags);
- i2c_smbus_write_byte_data(rv8803->client, RV8803_CTRL,
- rv8803->ctrl);
+ rv8803_write_reg(client, RV8803_FLAG, flags);
+ rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl);
}
mutex_unlock(&rv8803->flags_lock);
@@ -118,7 +186,7 @@ static int rv8803_get_time(struct device *dev, struct rtc_time *tm)
u8 *date = date1;
int ret, flags;
- flags = i2c_smbus_read_byte_data(rv8803->client, RV8803_FLAG);
+ flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
if (flags < 0)
return flags;
@@ -127,16 +195,14 @@ static int rv8803_get_time(struct device *dev, struct rtc_time *tm)
return -EINVAL;
}
- ret = i2c_smbus_read_i2c_block_data(rv8803->client, RV8803_SEC,
- 7, date);
- if (ret != 7)
- return ret < 0 ? ret : -EIO;
+ ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date);
+ if (ret)
+ return ret;
if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) {
- ret = i2c_smbus_read_i2c_block_data(rv8803->client, RV8803_SEC,
- 7, date2);
- if (ret != 7)
- return ret < 0 ? ret : -EIO;
+ ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2);
+ if (ret)
+ return ret;
if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59))
date = date2;
@@ -145,23 +211,33 @@ static int rv8803_get_time(struct device *dev, struct rtc_time *tm)
tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f);
tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f);
tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f);
- tm->tm_wday = ffs(date[RV8803_WEEK] & 0x7f);
+ tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f);
tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f);
tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1;
tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100;
- return rtc_valid_tm(tm);
+ return 0;
}
static int rv8803_set_time(struct device *dev, struct rtc_time *tm)
{
struct rv8803_data *rv8803 = dev_get_drvdata(dev);
u8 date[7];
- int flags, ret;
+ int ctrl, flags, ret;
if ((tm->tm_year < 100) || (tm->tm_year > 199))
return -EINVAL;
+ ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);
+ if (ctrl < 0)
+ return ctrl;
+
+ /* Stop the clock */
+ ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
+ ctrl | RV8803_CTRL_RESET);
+ if (ret)
+ return ret;
+
date[RV8803_SEC] = bin2bcd(tm->tm_sec);
date[RV8803_MIN] = bin2bcd(tm->tm_min);
date[RV8803_HOUR] = bin2bcd(tm->tm_hour);
@@ -170,21 +246,26 @@ static int rv8803_set_time(struct device *dev, struct rtc_time *tm)
date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1);
date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100);
- ret = i2c_smbus_write_i2c_block_data(rv8803->client, RV8803_SEC,
- 7, date);
- if (ret < 0)
+ ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date);
+ if (ret)
+ return ret;
+
+ /* Restart the clock */
+ ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
+ ctrl & ~RV8803_CTRL_RESET);
+ if (ret)
return ret;
mutex_lock(&rv8803->flags_lock);
- flags = i2c_smbus_read_byte_data(rv8803->client, RV8803_FLAG);
+ flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
if (flags < 0) {
mutex_unlock(&rv8803->flags_lock);
return flags;
}
- ret = i2c_smbus_write_byte_data(rv8803->client, RV8803_FLAG,
- flags & ~RV8803_FLAG_V2F);
+ ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
+ flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F));
mutex_unlock(&rv8803->flags_lock);
@@ -198,22 +279,18 @@ static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
u8 alarmvals[3];
int flags, ret;
- ret = i2c_smbus_read_i2c_block_data(client, RV8803_ALARM_MIN,
- 3, alarmvals);
- if (ret != 3)
- return ret < 0 ? ret : -EIO;
+ ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals);
+ if (ret)
+ return ret;
- flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
+ flags = rv8803_read_reg(client, RV8803_FLAG);
if (flags < 0)
return flags;
alrm->time.tm_sec = 0;
alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
- alrm->time.tm_wday = -1;
alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
- alrm->time.tm_mon = -1;
- alrm->time.tm_year = -1;
alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE);
alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled;
@@ -239,10 +316,10 @@ static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
mutex_lock(&rv8803->flags_lock);
- ret = i2c_smbus_read_i2c_block_data(client, RV8803_FLAG, 2, ctrl);
- if (ret != 2) {
+ ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl);
+ if (ret) {
mutex_unlock(&rv8803->flags_lock);
- return ret < 0 ? ret : -EIO;
+ return ret;
}
alarmvals[0] = bin2bcd(alrm->time.tm_min);
@@ -251,8 +328,8 @@ static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) {
rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE);
- err = i2c_smbus_write_byte_data(rv8803->client, RV8803_CTRL,
- rv8803->ctrl);
+ err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
+ rv8803->ctrl);
if (err) {
mutex_unlock(&rv8803->flags_lock);
return err;
@@ -260,13 +337,12 @@ static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
}
ctrl[1] &= ~RV8803_FLAG_AF;
- err = i2c_smbus_write_byte_data(rv8803->client, RV8803_FLAG, ctrl[1]);
+ err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]);
mutex_unlock(&rv8803->flags_lock);
if (err)
return err;
- err = i2c_smbus_write_i2c_block_data(rv8803->client, RV8803_ALARM_MIN,
- 3, alarmvals);
+ err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals);
if (err)
return err;
@@ -276,8 +352,8 @@ static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
if (rv8803->rtc->aie_timer.enabled)
rv8803->ctrl |= RV8803_CTRL_AIE;
- err = i2c_smbus_write_byte_data(rv8803->client, RV8803_CTRL,
- rv8803->ctrl);
+ err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
+ rv8803->ctrl);
if (err)
return err;
}
@@ -306,21 +382,20 @@ static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled)
}
mutex_lock(&rv8803->flags_lock);
- flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
+ flags = rv8803_read_reg(client, RV8803_FLAG);
if (flags < 0) {
mutex_unlock(&rv8803->flags_lock);
return flags;
}
flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF);
- err = i2c_smbus_write_byte_data(client, RV8803_FLAG, flags);
+ err = rv8803_write_reg(client, RV8803_FLAG, flags);
mutex_unlock(&rv8803->flags_lock);
if (err)
return err;
if (ctrl != rv8803->ctrl) {
rv8803->ctrl = ctrl;
- err = i2c_smbus_write_byte_data(client, RV8803_CTRL,
- rv8803->ctrl);
+ err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl);
if (err)
return err;
}
@@ -336,7 +411,7 @@ static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
switch (cmd) {
case RTC_VL_READ:
- flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
+ flags = rv8803_read_reg(client, RV8803_FLAG);
if (flags < 0)
return flags;
@@ -355,16 +430,16 @@ static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
case RTC_VL_CLR:
mutex_lock(&rv8803->flags_lock);
- flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
+ flags = rv8803_read_reg(client, RV8803_FLAG);
if (flags < 0) {
mutex_unlock(&rv8803->flags_lock);
return flags;
}
flags &= ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F);
- ret = i2c_smbus_write_byte_data(client, RV8803_FLAG, flags);
+ ret = rv8803_write_reg(client, RV8803_FLAG, flags);
mutex_unlock(&rv8803->flags_lock);
- if (ret < 0)
+ if (ret)
return ret;
return 0;
@@ -382,8 +457,8 @@ static ssize_t rv8803_nvram_write(struct file *filp, struct kobject *kobj,
struct i2c_client *client = to_i2c_client(dev);
int ret;
- ret = i2c_smbus_write_byte_data(client, RV8803_RAM, buf[0]);
- if (ret < 0)
+ ret = rv8803_write_reg(client, RV8803_RAM, buf[0]);
+ if (ret)
return ret;
return 1;
@@ -397,7 +472,7 @@ static ssize_t rv8803_nvram_read(struct file *filp, struct kobject *kobj,
struct i2c_client *client = to_i2c_client(dev);
int ret;
- ret = i2c_smbus_read_byte_data(client, RV8803_RAM);
+ ret = rv8803_read_reg(client, RV8803_RAM);
if (ret < 0)
return ret;
@@ -427,7 +502,7 @@ static int rv8803_probe(struct i2c_client *client,
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct rv8803_data *rv8803;
- int err, flags, try = 0;
+ int err, flags;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_I2C_BLOCK)) {
@@ -444,16 +519,7 @@ static int rv8803_probe(struct i2c_client *client,
rv8803->client = client;
i2c_set_clientdata(client, rv8803);
- /*
- * There is a 60µs window where the RTC may not reply on the i2c bus in
- * that case, the transfer is not ACKed. In that case, ensure there are
- * multiple attempts.
- */
- do {
- flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
- try++;
- } while ((flags == -ENXIO) && (try < 3));
-
+ flags = rv8803_read_reg(client, RV8803_FLAG);
if (flags < 0)
return flags;
@@ -488,12 +554,7 @@ static int rv8803_probe(struct i2c_client *client,
return PTR_ERR(rv8803->rtc);
}
- try = 0;
- do {
- err = i2c_smbus_write_byte_data(rv8803->client, RV8803_EXT,
- RV8803_EXT_WADA);
- try++;
- } while ((err == -ENXIO) && (try < 3));
+ err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
if (err)
return err;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 16:14:13 +0000