RTC for 4.6 #2
Drivers:
- abx80x: handle both XT and RC oscillators, XT failure bit and autocalibration
- m41t80: avoid out of range year values
- rv8803: workaround an i2c HW issue
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Merge tag 'rtc-4.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
Pull more RTC updates from Alexandre Belloni:
"A second pull request for v4.6 with a few fixesi before -rc1. The new
features for abx80x actually make the RTC behave correctly.
Drivers:
- abx80x: handle both XT and RC oscillators, XT failure bit and
autocalibration
- m41t80: avoid out of range year values
- rv8803: workaround an i2c HW issue"
* tag 'rtc-4.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
rtc: abx80x: handle the oscillator failure bit
rtc: abx80x: handle autocalibration
rtc: rv8803: workaround i2c HW issue
rtc: mcp795: add devicetree support
rtc: asm9260: remove incorrect __init/__exit annotations
rtc: m41t80: avoid out of range year values
rtc: s3c: Don't print an error on probe deferral
rtc: rv3029: stop mentioning rv3029c2
This commit is contained in:
Linus Torvalds
commit
8407ef4685
8 changed files with 316 additions and 16 deletions
11
Documentation/devicetree/bindings/rtc/maxim,mcp795.txt
Normal file
11
Documentation/devicetree/bindings/rtc/maxim,mcp795.txt
Normal file
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@ -0,0 +1,11 @@
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* Maxim MCP795 SPI Serial Real-Time Clock
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Required properties:
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- compatible: Should contain "maxim,mcp795".
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- reg: SPI address for chip
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Example:
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mcp795: rtc@0 {
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compatible = "maxim,mcp795";
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reg = <0>;
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};
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@ -589,7 +589,7 @@ config RTC_DRV_RV3029_HWMON
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default y
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help
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Say Y here if you want to expose temperature sensor data on
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rtc-rv3029c2.
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rtc-rv3029.
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config RTC_DRV_RV8803
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tristate "Micro Crystal RV8803"
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@ -49,7 +49,20 @@
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#define ABX8XX_REG_CD_TIMER_CTL 0x18
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#define ABX8XX_REG_OSC 0x1c
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#define ABX8XX_OSC_FOS BIT(3)
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#define ABX8XX_OSC_BOS BIT(4)
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#define ABX8XX_OSC_ACAL_512 BIT(5)
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#define ABX8XX_OSC_ACAL_1024 BIT(6)
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#define ABX8XX_OSC_OSEL BIT(7)
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#define ABX8XX_REG_OSS 0x1d
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#define ABX8XX_OSS_OF BIT(1)
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#define ABX8XX_OSS_OMODE BIT(4)
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#define ABX8XX_REG_CFG_KEY 0x1f
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#define ABX8XX_CFG_KEY_OSC 0xa1
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#define ABX8XX_CFG_KEY_MISC 0x9d
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#define ABX8XX_REG_ID0 0x28
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@ -81,6 +94,20 @@ static struct abx80x_cap abx80x_caps[] = {
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[ABX80X] = {.pn = 0}
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};
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static int abx80x_is_rc_mode(struct i2c_client *client)
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{
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int flags = 0;
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
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if (flags < 0) {
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dev_err(&client->dev,
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"Failed to read autocalibration attribute\n");
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return flags;
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}
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return (flags & ABX8XX_OSS_OMODE) ? 1 : 0;
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}
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static int abx80x_enable_trickle_charger(struct i2c_client *client,
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u8 trickle_cfg)
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{
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@ -112,7 +139,23 @@ static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[8];
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int err;
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int err, flags, rc_mode = 0;
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/* Read the Oscillator Failure only in XT mode */
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rc_mode = abx80x_is_rc_mode(client);
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if (rc_mode < 0)
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return rc_mode;
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if (!rc_mode) {
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
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if (flags < 0)
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return flags;
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if (flags & ABX8XX_OSS_OF) {
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dev_err(dev, "Oscillator failure, data is invalid.\n");
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return -EINVAL;
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}
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}
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err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
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sizeof(buf), buf);
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@ -140,7 +183,7 @@ static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[8];
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int err;
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int err, flags;
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if (tm->tm_year < 100)
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return -EINVAL;
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@ -161,6 +204,18 @@ static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
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return -EIO;
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}
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/* Clear the OF bit of Oscillator Status Register */
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
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if (flags < 0)
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return flags;
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err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
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flags & ~ABX8XX_OSS_OF);
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if (err < 0) {
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dev_err(&client->dev, "Unable to write oscillator status register\n");
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return err;
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}
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return 0;
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}
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@ -248,6 +303,174 @@ static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
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return 0;
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}
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static int abx80x_rtc_set_autocalibration(struct device *dev,
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int autocalibration)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int retval, flags = 0;
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if ((autocalibration != 0) && (autocalibration != 1024) &&
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(autocalibration != 512)) {
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dev_err(dev, "autocalibration value outside permitted range\n");
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return -EINVAL;
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}
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
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if (flags < 0)
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return flags;
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if (autocalibration == 0) {
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flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024);
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} else if (autocalibration == 1024) {
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/* 1024 autocalibration is 0x10 */
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flags |= ABX8XX_OSC_ACAL_1024;
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flags &= ~(ABX8XX_OSC_ACAL_512);
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} else {
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/* 512 autocalibration is 0x11 */
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flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512);
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}
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/* Unlock write access to Oscillator Control Register */
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retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
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ABX8XX_CFG_KEY_OSC);
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if (retval < 0) {
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dev_err(dev, "Failed to write CONFIG_KEY register\n");
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return retval;
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}
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retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
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return retval;
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}
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static int abx80x_rtc_get_autocalibration(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int flags = 0, autocalibration;
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
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if (flags < 0)
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return flags;
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if (flags & ABX8XX_OSC_ACAL_512)
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autocalibration = 512;
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else if (flags & ABX8XX_OSC_ACAL_1024)
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autocalibration = 1024;
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else
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autocalibration = 0;
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return autocalibration;
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}
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static ssize_t autocalibration_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int retval;
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unsigned long autocalibration = 0;
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retval = kstrtoul(buf, 10, &autocalibration);
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if (retval < 0) {
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dev_err(dev, "Failed to store RTC autocalibration attribute\n");
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return -EINVAL;
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}
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retval = abx80x_rtc_set_autocalibration(dev, autocalibration);
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return retval ? retval : count;
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}
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static ssize_t autocalibration_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int autocalibration = 0;
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autocalibration = abx80x_rtc_get_autocalibration(dev);
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if (autocalibration < 0) {
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dev_err(dev, "Failed to read RTC autocalibration\n");
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sprintf(buf, "0\n");
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return autocalibration;
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}
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return sprintf(buf, "%d\n", autocalibration);
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}
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static DEVICE_ATTR_RW(autocalibration);
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static ssize_t oscillator_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int retval, flags, rc_mode = 0;
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if (strncmp(buf, "rc", 2) == 0) {
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rc_mode = 1;
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} else if (strncmp(buf, "xtal", 4) == 0) {
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rc_mode = 0;
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} else {
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dev_err(dev, "Oscillator selection value outside permitted ones\n");
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return -EINVAL;
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}
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
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if (flags < 0)
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return flags;
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if (rc_mode == 0)
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flags &= ~(ABX8XX_OSC_OSEL);
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else
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flags |= (ABX8XX_OSC_OSEL);
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/* Unlock write access on Oscillator Control register */
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retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
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ABX8XX_CFG_KEY_OSC);
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if (retval < 0) {
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dev_err(dev, "Failed to write CONFIG_KEY register\n");
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return retval;
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}
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retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
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if (retval < 0) {
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dev_err(dev, "Failed to write Oscillator Control register\n");
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return retval;
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}
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return retval ? retval : count;
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}
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static ssize_t oscillator_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int rc_mode = 0;
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struct i2c_client *client = to_i2c_client(dev);
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rc_mode = abx80x_is_rc_mode(client);
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if (rc_mode < 0) {
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dev_err(dev, "Failed to read RTC oscillator selection\n");
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sprintf(buf, "\n");
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return rc_mode;
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}
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if (rc_mode)
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return sprintf(buf, "rc\n");
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else
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return sprintf(buf, "xtal\n");
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}
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static DEVICE_ATTR_RW(oscillator);
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static struct attribute *rtc_calib_attrs[] = {
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&dev_attr_autocalibration.attr,
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&dev_attr_oscillator.attr,
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NULL,
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};
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static const struct attribute_group rtc_calib_attr_group = {
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.attrs = rtc_calib_attrs,
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};
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static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct i2c_client *client = to_i2c_client(dev);
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|
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@ -303,6 +526,13 @@ static int abx80x_dt_trickle_cfg(struct device_node *np)
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return (trickle_cfg | i);
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}
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|
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static void rtc_calib_remove_sysfs_group(void *_dev)
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{
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struct device *dev = _dev;
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sysfs_remove_group(&dev->kobj, &rtc_calib_attr_group);
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}
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|
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static int abx80x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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|
|
@ -405,6 +635,24 @@ static int abx80x_probe(struct i2c_client *client,
|
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}
|
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}
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|
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/* Export sysfs entries */
|
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err = sysfs_create_group(&(&client->dev)->kobj, &rtc_calib_attr_group);
|
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if (err) {
|
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dev_err(&client->dev, "Failed to create sysfs group: %d\n",
|
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err);
|
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return err;
|
||||
}
|
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|
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err = devm_add_action(&client->dev, rtc_calib_remove_sysfs_group,
|
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&client->dev);
|
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if (err) {
|
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rtc_calib_remove_sysfs_group(&client->dev);
|
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dev_err(&client->dev,
|
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"Failed to add sysfs cleanup action: %d\n",
|
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err);
|
||||
return err;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -255,7 +255,7 @@ static const struct rtc_class_ops asm9260_rtc_ops = {
|
|||
.alarm_irq_enable = asm9260_alarm_irq_enable,
|
||||
};
|
||||
|
||||
static int __init asm9260_rtc_probe(struct platform_device *pdev)
|
||||
static int asm9260_rtc_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct asm9260_rtc_priv *priv;
|
||||
struct device *dev = &pdev->dev;
|
||||
|
|
@ -323,7 +323,7 @@ static int __init asm9260_rtc_probe(struct platform_device *pdev)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int __exit asm9260_rtc_remove(struct platform_device *pdev)
|
||||
static int asm9260_rtc_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct asm9260_rtc_priv *priv = platform_get_drvdata(pdev);
|
||||
|
||||
|
|
|
|||
|
|
@ -176,7 +176,13 @@ static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm)
|
|||
bin2bcd(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f);
|
||||
buf[M41T80_REG_MON] =
|
||||
bin2bcd(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f);
|
||||
|
||||
/* assume 20YY not 19YY */
|
||||
if (tm->tm_year < 100 || tm->tm_year > 199) {
|
||||
dev_err(&client->dev, "Year must be between 2000 and 2099. It's %d.\n",
|
||||
tm->tm_year + 1900);
|
||||
return -EINVAL;
|
||||
}
|
||||
buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year % 100);
|
||||
|
||||
if (i2c_transfer(client->adapter, msgs, 1) != 1) {
|
||||
|
|
|
|||
|
|
@ -20,6 +20,7 @@
|
|||
#include <linux/printk.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/rtc.h>
|
||||
#include <linux/of.h>
|
||||
|
||||
/* MCP795 Instructions, see datasheet table 3-1 */
|
||||
#define MCP795_EEREAD 0x03
|
||||
|
|
@ -183,9 +184,18 @@ static int mcp795_probe(struct spi_device *spi)
|
|||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static const struct of_device_id mcp795_of_match[] = {
|
||||
{ .compatible = "maxim,mcp795" },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, mcp795_of_match);
|
||||
#endif
|
||||
|
||||
static struct spi_driver mcp795_driver = {
|
||||
.driver = {
|
||||
.name = "rtc-mcp795",
|
||||
.of_match_table = of_match_ptr(mcp795_of_match),
|
||||
},
|
||||
.probe = mcp795_probe,
|
||||
};
|
||||
|
|
|
|||
|
|
@ -61,11 +61,14 @@ 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;
|
||||
int flags, try = 0;
|
||||
|
||||
mutex_lock(&rv8803->flags_lock);
|
||||
|
||||
flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
|
||||
do {
|
||||
flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
|
||||
try++;
|
||||
} while ((flags == -ENXIO) && (try < 3));
|
||||
if (flags <= 0) {
|
||||
mutex_unlock(&rv8803->flags_lock);
|
||||
return IRQ_NONE;
|
||||
|
|
@ -424,7 +427,7 @@ 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;
|
||||
int err, flags, try = 0;
|
||||
|
||||
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
|
||||
I2C_FUNC_SMBUS_I2C_BLOCK)) {
|
||||
|
|
@ -441,7 +444,16 @@ static int rv8803_probe(struct i2c_client *client,
|
|||
rv8803->client = client;
|
||||
i2c_set_clientdata(client, rv8803);
|
||||
|
||||
flags = i2c_smbus_read_byte_data(client, RV8803_FLAG);
|
||||
/*
|
||||
* 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));
|
||||
|
||||
if (flags < 0)
|
||||
return flags;
|
||||
|
||||
|
|
@ -476,8 +488,12 @@ static int rv8803_probe(struct i2c_client *client,
|
|||
return PTR_ERR(rv8803->rtc);
|
||||
}
|
||||
|
||||
err = i2c_smbus_write_byte_data(rv8803->client, RV8803_EXT,
|
||||
RV8803_EXT_WADA);
|
||||
try = 0;
|
||||
do {
|
||||
err = i2c_smbus_write_byte_data(rv8803->client, RV8803_EXT,
|
||||
RV8803_EXT_WADA);
|
||||
try++;
|
||||
} while ((err == -ENXIO) && (try < 3));
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
|
|
|
|||
|
|
@ -501,18 +501,27 @@ static int s3c_rtc_probe(struct platform_device *pdev)
|
|||
|
||||
info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
|
||||
if (IS_ERR(info->rtc_clk)) {
|
||||
dev_err(&pdev->dev, "failed to find rtc clock\n");
|
||||
return PTR_ERR(info->rtc_clk);
|
||||
ret = PTR_ERR(info->rtc_clk);
|
||||
if (ret != -EPROBE_DEFER)
|
||||
dev_err(&pdev->dev, "failed to find rtc clock\n");
|
||||
else
|
||||
dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
|
||||
return ret;
|
||||
}
|
||||
clk_prepare_enable(info->rtc_clk);
|
||||
|
||||
if (info->data->needs_src_clk) {
|
||||
info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
|
||||
if (IS_ERR(info->rtc_src_clk)) {
|
||||
dev_err(&pdev->dev,
|
||||
"failed to find rtc source clock\n");
|
||||
ret = PTR_ERR(info->rtc_src_clk);
|
||||
if (ret != -EPROBE_DEFER)
|
||||
dev_err(&pdev->dev,
|
||||
"failed to find rtc source clock\n");
|
||||
else
|
||||
dev_dbg(&pdev->dev,
|
||||
"probe deferred due to missing rtc src clk\n");
|
||||
clk_disable_unprepare(info->rtc_clk);
|
||||
return PTR_ERR(info->rtc_src_clk);
|
||||
return ret;
|
||||
}
|
||||
clk_prepare_enable(info->rtc_src_clk);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue