rtc-pcf8523: add low battery voltage support (f32bc70d) · Commits · 戴 / test

drivers/rtc/rtc-pcf8523.c

+31 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@
		#define REG_CONTROL3_PM_VDD (1 << 6) /* switch-over disabled */
		#define REG_CONTROL3_PM_DSM (1 << 5) /* direct switching mode */
		#define REG_CONTROL3_PM_MASK 0xe0
		#define REG_CONTROL3_BLF (1 << 2) /* battery low bit, read-only */

		#define REG_SECONDS 0x03
		#define REG_SECONDS_OS (1 << 7)
		@@ -250,9 +251,39 @@ static int pcf8523_rtc_set_time(struct device dev, struct rtc_time tm)
		return pcf8523_start_rtc(client);
		}

		#ifdef CONFIG_RTC_INTF_DEV
		static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd,
		unsigned long arg)
		{
		struct i2c_client *client = to_i2c_client(dev);
		u8 value;
		int ret = 0, err;

		switch (cmd) {
		case RTC_VL_READ:
		err = pcf8523_read(client, REG_CONTROL3, &value);
		if (err < 0)
		return err;

		if (value & REG_CONTROL3_BLF)
		ret = 1;

		if (copy_to_user((void __user *)arg, &ret, sizeof(int)))
		return -EFAULT;

		return 0;
		default:
		return -ENOIOCTLCMD;
		}
		}
		#else
		#define pcf8523_rtc_ioctl NULL
		#endif

		static const struct rtc_class_ops pcf8523_rtc_ops = {
		.read_time = pcf8523_rtc_read_time,
		.set_time = pcf8523_rtc_set_time,
		.ioctl = pcf8523_rtc_ioctl,
		};

		static int pcf8523_probe(struct i2c_client *client,