rtc-rs5c372.c

linux 内核源代码

	t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]);
	t->time.tm_mday = -1;
	t->time.tm_mon = -1;
	t->time.tm_year = -1;
	t->time.tm_wday = -1;
	t->time.tm_yday = -1;
	t->time.tm_isdst = -1;

	/* ... and status */
	t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE);
	t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG);

	return 0;
}

static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
	struct i2c_client	*client = to_i2c_client(dev);
	struct rs5c372		*rs5c = i2c_get_clientdata(client);
	int			status;
	unsigned char		buf[4];

	/* only handle up to 24 hours in the future, like RTC_ALM_SET */
	if (t->time.tm_mday != -1
			|| t->time.tm_mon != -1
			|| t->time.tm_year != -1)
		return -EINVAL;

	/* REVISIT: round up tm_sec */

	/* if needed, disable irq (clears pending status) */
	status = rs5c_get_regs(rs5c);
	if (status < 0)
		return status;
	if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) {
		buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
		buf[1] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE;
		if (i2c_master_send(client, buf, 2) != 2) {
			pr_debug("%s: can't disable alarm\n", rs5c->rtc->name);
			return -EIO;
		}
		rs5c->regs[RS5C_REG_CTRL1] = buf[1];
	}

	/* set alarm */
	buf[0] = RS5C_ADDR(RS5C_REG_ALARM_A_MIN);
	buf[1] = BIN2BCD(t->time.tm_min);
	buf[2] = rs5c_hr2reg(rs5c, t->time.tm_hour);
	buf[3] = 0x7f;	/* any/all days */
	if ((i2c_master_send(client, buf, 4)) != 4) {
		pr_debug("%s: can't set alarm time\n", rs5c->rtc->name);
		return -EIO;
	}

	/* ... and maybe enable its irq */
	if (t->enabled) {
		buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
		buf[1] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE;
		if ((i2c_master_send(client, buf, 2)) != 2)
			printk(KERN_WARNING "%s: can't enable alarm\n",
				rs5c->rtc->name);
		rs5c->regs[RS5C_REG_CTRL1] = buf[1];
	}

	return 0;
}

#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)

static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
{
	int err, osc, trim;

	err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
	if (err == 0) {
		seq_printf(seq, "crystal\t\t: %d.%03d KHz\n",
				osc / 1000, osc % 1000);
		seq_printf(seq, "trim\t\t: %d\n", trim);
	}

	return 0;
}

#else
#define	rs5c372_rtc_proc	NULL
#endif

static const struct rtc_class_ops rs5c372_rtc_ops = {
	.proc		= rs5c372_rtc_proc,
	.ioctl		= rs5c_rtc_ioctl,
	.read_time	= rs5c372_rtc_read_time,
	.set_time	= rs5c372_rtc_set_time,
	.read_alarm	= rs5c_read_alarm,
	.set_alarm	= rs5c_set_alarm,
};

#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)

static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	int err, trim;

	err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim);
	if (err)
		return err;

	return sprintf(buf, "%d\n", trim);
}
static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);

static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	int err, osc;

	err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL);
	if (err)
		return err;

	return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
}
static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);

static int rs5c_sysfs_register(struct device *dev)
{
	int err;

	err = device_create_file(dev, &dev_attr_trim);
	if (err)
		return err;
	err = device_create_file(dev, &dev_attr_osc);
	if (err)
		device_remove_file(dev, &dev_attr_trim);

	return err;
}

static void rs5c_sysfs_unregister(struct device *dev)
{
	device_remove_file(dev, &dev_attr_trim);
	device_remove_file(dev, &dev_attr_osc);
}

#else
static int rs5c_sysfs_register(struct device *dev)
{
	return 0;
}

static void rs5c_sysfs_unregister(struct device *dev)
{
	/* nothing */
}
#endif	/* SYSFS */

static struct i2c_driver rs5c372_driver;

static int rs5c372_probe(struct i2c_client *client)
{
	int err = 0;
	struct rs5c372 *rs5c372;
	struct rtc_time tm;

	dev_dbg(&client->dev, "%s\n", __FUNCTION__);

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		err = -ENODEV;
		goto exit;
	}

	if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}

	/* we read registers 0x0f then 0x00-0x0f; skip the first one */
	rs5c372->regs=&rs5c372->buf[1];

	rs5c372->client = client;
	i2c_set_clientdata(client, rs5c372);

	err = rs5c_get_regs(rs5c372);
	if (err < 0)
		goto exit_kfree;

	if (strcmp(client->name, "rs5c372a") == 0)
		rs5c372->type = rtc_rs5c372a;
	else if (strcmp(client->name, "rs5c372b") == 0)
		rs5c372->type = rtc_rs5c372b;
	else if (strcmp(client->name, "rv5c386") == 0)
		rs5c372->type = rtc_rv5c386;
	else if (strcmp(client->name, "rv5c387a") == 0)
		rs5c372->type = rtc_rv5c387a;
	else {
		rs5c372->type = rtc_rs5c372b;
		dev_warn(&client->dev, "assuming rs5c372b\n");
	}

	/* clock may be set for am/pm or 24 hr time */
	switch (rs5c372->type) {
	case rtc_rs5c372a:
	case rtc_rs5c372b:
		/* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b.
		 * so does periodic irq, except some 327a modes.
		 */
		if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24)
			rs5c372->time24 = 1;
		break;
	case rtc_rv5c386:
	case rtc_rv5c387a:
		if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24)
			rs5c372->time24 = 1;
		/* alarm uses ALARM_W; and nINTRB for alarm and periodic
		 * irq, on both 386 and 387
		 */
		break;
	default:
		dev_err(&client->dev, "unknown RTC type\n");
		goto exit_kfree;
	}

	/* if the oscillator lost power and no other software (like
	 * the bootloader) set it up, do it here.
	 */
	if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP) {
		unsigned char buf[3];

		rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;

		buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
		buf[1] = rs5c372->regs[RS5C_REG_CTRL1];
		buf[2] = rs5c372->regs[RS5C_REG_CTRL2];

		/* use 24hr mode */
		switch (rs5c372->type) {
		case rtc_rs5c372a:
		case rtc_rs5c372b:
			buf[2] |= RS5C372_CTRL2_24;
			rs5c372->time24 = 1;
			break;
		case rtc_rv5c386:
		case rtc_rv5c387a:
			buf[1] |= RV5C387_CTRL1_24;
			rs5c372->time24 = 1;
			break;
		default:
			/* impossible */
			break;
		}

		if ((i2c_master_send(client, buf, 3)) != 3) {
			dev_err(&client->dev, "setup error\n");
			goto exit_kfree;
		}
		rs5c372->regs[RS5C_REG_CTRL1] = buf[1];
		rs5c372->regs[RS5C_REG_CTRL2] = buf[2];
	}

	if (rs5c372_get_datetime(client, &tm) < 0)
		dev_warn(&client->dev, "clock needs to be set\n");

	dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
			({ char *s; switch (rs5c372->type) {
			case rtc_rs5c372a:	s = "rs5c372a"; break;
			case rtc_rs5c372b:	s = "rs5c372b"; break;
			case rtc_rv5c386:	s = "rv5c386"; break;
			case rtc_rv5c387a:	s = "rv5c387a"; break;
			default:		s = "chip"; break;
			}; s;}),
			rs5c372->time24 ? "24hr" : "am/pm"
			);

	/* REVISIT use client->irq to register alarm irq ... */

	rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name,
				&client->dev, &rs5c372_rtc_ops, THIS_MODULE);

	if (IS_ERR(rs5c372->rtc)) {
		err = PTR_ERR(rs5c372->rtc);
		goto exit_kfree;
	}

	err = rs5c_sysfs_register(&client->dev);
	if (err)
		goto exit_devreg;

	return 0;

exit_devreg:
	rtc_device_unregister(rs5c372->rtc);

exit_kfree:
	kfree(rs5c372);

exit:
	return err;
}

static int rs5c372_remove(struct i2c_client *client)
{
	struct rs5c372 *rs5c372 = i2c_get_clientdata(client);

	rtc_device_unregister(rs5c372->rtc);
	rs5c_sysfs_unregister(&client->dev);
	kfree(rs5c372);
	return 0;
}

static struct i2c_driver rs5c372_driver = {
	.driver		= {
		.name	= "rtc-rs5c372",
	},
	.probe		= rs5c372_probe,
	.remove		= rs5c372_remove,
};

static __init int rs5c372_init(void)
{
	return i2c_add_driver(&rs5c372_driver);
}

static __exit void rs5c372_exit(void)
{
	i2c_del_driver(&rs5c372_driver);
}

module_init(rs5c372_init);
module_exit(rs5c372_exit);

MODULE_AUTHOR(
		"Pavel Mironchik <[e-mail]>, "
		"Alessandro Zummo <[e-mail]>");
MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);