#define ABX8XX_REG_CD_TIMER_CTL 0x18
+#define ABX8XX_REG_OSC 0x1c
+#define ABX8XX_OSC_FOS BIT(3)
+#define ABX8XX_OSC_BOS BIT(4)
+#define ABX8XX_OSC_ACAL_512 BIT(5)
+#define ABX8XX_OSC_ACAL_1024 BIT(6)
+
+#define ABX8XX_OSC_OSEL BIT(7)
+
+#define ABX8XX_REG_OSS 0x1d
+#define ABX8XX_OSS_OF BIT(1)
+#define ABX8XX_OSS_OMODE BIT(4)
+
#define ABX8XX_REG_CFG_KEY 0x1f
+#define ABX8XX_CFG_KEY_OSC 0xa1
#define ABX8XX_CFG_KEY_MISC 0x9d
#define ABX8XX_REG_ID0 0x28
[ABX80X] = {.pn = 0}
};
+static int abx80x_is_rc_mode(struct i2c_client *client)
+{
+ int flags = 0;
+
+ flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
+ if (flags < 0) {
+ dev_err(&client->dev,
+ "Failed to read autocalibration attribute\n");
+ return flags;
+ }
+
+ return (flags & ABX8XX_OSS_OMODE) ? 1 : 0;
+}
+
static int abx80x_enable_trickle_charger(struct i2c_client *client,
u8 trickle_cfg)
{
{
struct i2c_client *client = to_i2c_client(dev);
unsigned char buf[8];
- int err;
+ int err, flags, rc_mode = 0;
+
+ /* Read the Oscillator Failure only in XT mode */
+ rc_mode = abx80x_is_rc_mode(client);
+ if (rc_mode < 0)
+ return rc_mode;
+
+ if (!rc_mode) {
+ flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
+ if (flags < 0)
+ return flags;
+
+ if (flags & ABX8XX_OSS_OF) {
+ dev_err(dev, "Oscillator failure, data is invalid.\n");
+ return -EINVAL;
+ }
+ }
err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
sizeof(buf), buf);
{
struct i2c_client *client = to_i2c_client(dev);
unsigned char buf[8];
- int err;
+ int err, flags;
if (tm->tm_year < 100)
return -EINVAL;
return -EIO;
}
+ /* Clear the OF bit of Oscillator Status Register */
+ flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
+ if (flags < 0)
+ return flags;
+
+ err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
+ flags & ~ABX8XX_OSS_OF);
+ if (err < 0) {
+ dev_err(&client->dev, "Unable to write oscillator status register\n");
+ return err;
+ }
+
return 0;
}
return 0;
}
+static int abx80x_rtc_set_autocalibration(struct device *dev,
+ int autocalibration)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int retval, flags = 0;
+
+ if ((autocalibration != 0) && (autocalibration != 1024) &&
+ (autocalibration != 512)) {
+ dev_err(dev, "autocalibration value outside permitted range\n");
+ return -EINVAL;
+ }
+
+ flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
+ if (flags < 0)
+ return flags;
+
+ if (autocalibration == 0) {
+ flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024);
+ } else if (autocalibration == 1024) {
+ /* 1024 autocalibration is 0x10 */
+ flags |= ABX8XX_OSC_ACAL_1024;
+ flags &= ~(ABX8XX_OSC_ACAL_512);
+ } else {
+ /* 512 autocalibration is 0x11 */
+ flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512);
+ }
+
+ /* Unlock write access to Oscillator Control Register */
+ retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
+ ABX8XX_CFG_KEY_OSC);
+ if (retval < 0) {
+ dev_err(dev, "Failed to write CONFIG_KEY register\n");
+ return retval;
+ }
+
+ retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
+
+ return retval;
+}
+
+static int abx80x_rtc_get_autocalibration(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int flags = 0, autocalibration;
+
+ flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
+ if (flags < 0)
+ return flags;
+
+ if (flags & ABX8XX_OSC_ACAL_512)
+ autocalibration = 512;
+ else if (flags & ABX8XX_OSC_ACAL_1024)
+ autocalibration = 1024;
+ else
+ autocalibration = 0;
+
+ return autocalibration;
+}
+
+static ssize_t autocalibration_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int retval;
+ unsigned long autocalibration = 0;
+
+ retval = kstrtoul(buf, 10, &autocalibration);
+ if (retval < 0) {
+ dev_err(dev, "Failed to store RTC autocalibration attribute\n");
+ return -EINVAL;
+ }
+
+ retval = abx80x_rtc_set_autocalibration(dev, autocalibration);
+
+ return retval ? retval : count;
+}
+
+static ssize_t autocalibration_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int autocalibration = 0;
+
+ autocalibration = abx80x_rtc_get_autocalibration(dev);
+ if (autocalibration < 0) {
+ dev_err(dev, "Failed to read RTC autocalibration\n");
+ sprintf(buf, "0\n");
+ return autocalibration;
+ }
+
+ return sprintf(buf, "%d\n", autocalibration);
+}
+
+static DEVICE_ATTR_RW(autocalibration);
+
+static ssize_t oscillator_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int retval, flags, rc_mode = 0;
+
+ if (strncmp(buf, "rc", 2) == 0) {
+ rc_mode = 1;
+ } else if (strncmp(buf, "xtal", 4) == 0) {
+ rc_mode = 0;
+ } else {
+ dev_err(dev, "Oscillator selection value outside permitted ones\n");
+ return -EINVAL;
+ }
+
+ flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
+ if (flags < 0)
+ return flags;
+
+ if (rc_mode == 0)
+ flags &= ~(ABX8XX_OSC_OSEL);
+ else
+ flags |= (ABX8XX_OSC_OSEL);
+
+ /* Unlock write access on Oscillator Control register */
+ retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
+ ABX8XX_CFG_KEY_OSC);
+ if (retval < 0) {
+ dev_err(dev, "Failed to write CONFIG_KEY register\n");
+ return retval;
+ }
+
+ retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
+ if (retval < 0) {
+ dev_err(dev, "Failed to write Oscillator Control register\n");
+ return retval;
+ }
+
+ return retval ? retval : count;
+}
+
+static ssize_t oscillator_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int rc_mode = 0;
+ struct i2c_client *client = to_i2c_client(dev);
+
+ rc_mode = abx80x_is_rc_mode(client);
+
+ if (rc_mode < 0) {
+ dev_err(dev, "Failed to read RTC oscillator selection\n");
+ sprintf(buf, "\n");
+ return rc_mode;
+ }
+
+ if (rc_mode)
+ return sprintf(buf, "rc\n");
+ else
+ return sprintf(buf, "xtal\n");
+}
+
+static DEVICE_ATTR_RW(oscillator);
+
+static struct attribute *rtc_calib_attrs[] = {
+ &dev_attr_autocalibration.attr,
+ &dev_attr_oscillator.attr,
+ NULL,
+};
+
+static const struct attribute_group rtc_calib_attr_group = {
+ .attrs = rtc_calib_attrs,
+};
+
static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct i2c_client *client = to_i2c_client(dev);
return (trickle_cfg | i);
}
+static void rtc_calib_remove_sysfs_group(void *_dev)
+{
+ struct device *dev = _dev;
+
+ sysfs_remove_group(&dev->kobj, &rtc_calib_attr_group);
+}
+
static int abx80x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
}
}
+ /* Export sysfs entries */
+ err = sysfs_create_group(&(&client->dev)->kobj, &rtc_calib_attr_group);
+ if (err) {
+ dev_err(&client->dev, "Failed to create sysfs group: %d\n",
+ err);
+ return err;
+ }
+
+ err = devm_add_action(&client->dev, rtc_calib_remove_sysfs_group,
+ &client->dev);
+ if (err) {
+ rtc_calib_remove_sysfs_group(&client->dev);
+ dev_err(&client->dev,
+ "Failed to add sysfs cleanup action: %d\n",
+ err);
+ return err;
+ }
+
return 0;
}
projects / deliverable / linux.git / blobdiff