path: root/packages/linux/ixp4xx-kernel/2.6.15/60-nas100d-i2c.patch

 drivers/i2c/chips/Kconfig   |    9 
 drivers/i2c/chips/Makefile  |    1 
 drivers/i2c/chips/pcf8563.c |  466 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/pcf8563.h     |   27 ++
 4 files changed, 503 insertions(+)

--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-nslu2/drivers/i2c/chips/pcf8563.c	2006-01-20 11:57:40.000000000 +0100
@@ -0,0 +1,466 @@
+/*
+ * pcf8563.c - An i2c driver for the Philips PCF8563 RTC
+ * Copyright 2005 Tower Technologies
+ *
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ * Maintainers: http://www.nslu2-linux.org/
+ *
+ * based on the other drivers in this same directory.
+ *
+ * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/string.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/list.h>
+
+#include <linux/pcf8563.h>
+
+#define DRV_VERSION "0.3.4"
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = { 0x51, I2C_CLIENT_END };
+
+/* Module parameters */
+I2C_CLIENT_INSMOD;
+I2C_CLIENT_MODULE_PARM(hctosys,
+	"Set the system time from the hardware clock upon initialization");
+
+#define PCF8563_REG_ST1		0x00 /* status */
+#define PCF8563_REG_ST2		0x01
+
+#define PCF8563_REG_SC		0x02 /* datetime */
+#define PCF8563_REG_MN		0x03
+#define PCF8563_REG_HR		0x04
+#define PCF8563_REG_DM		0x05
+#define PCF8563_REG_DW		0x06
+#define PCF8563_REG_MO		0x07
+#define PCF8563_REG_YR		0x08
+
+#define PCF8563_REG_AMN		0x09 /* alarm */
+#define PCF8563_REG_AHR		0x0A
+#define PCF8563_REG_ADM		0x0B
+#define PCF8563_REG_ADW		0x0C
+
+#define PCF8563_REG_CLKO	0x0D /* clock out */
+#define PCF8563_REG_TMRC	0x0E /* timer control */
+#define PCF8563_REG_TMR		0x0F /* timer */
+
+#define PCF8563_SC_LV		0x80 /* low voltage */
+#define PCF8563_MO_C		0x80 /* century */
+
+/* Prototypes */
+static int pcf8563_attach(struct i2c_adapter *adapter);
+static int pcf8563_detach(struct i2c_client *client);
+static int pcf8563_probe(struct i2c_adapter *adapter, int address, int kind);
+static int pcf8563_command(struct i2c_client *client, unsigned int cmd,
+	void *arg);
+
+static struct i2c_driver pcf8563_driver = {
+	.owner		= THIS_MODULE,
+	.name		= "pcf8563",
+	.flags		= I2C_DF_NOTIFY,
+	.attach_adapter = &pcf8563_attach,
+	.detach_client	= &pcf8563_detach,
+};
+
+struct pcf8563_data {
+	struct i2c_client client;
+	struct list_head list;
+};
+
+static const unsigned char days_in_mo[] =
+	{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+
+static LIST_HEAD(pcf8563_clients);
+
+/* Workaround until the I2C subsytem will allow to send
+ * commands to a specific client. This function will send the command
+ * to the first client.
+ */
+int pcf8563_do_command(unsigned int cmd, void *arg)
+{
+	struct list_head *walk;
+	struct list_head *tmp;
+	struct pcf8563_data *data;
+
+	list_for_each_safe(walk, tmp, &pcf8563_clients) {
+		data = list_entry(walk, struct pcf8563_data, list);
+		return pcf8563_command(&data->client, cmd, arg);
+	}
+
+	return -ENODEV;
+}
+
+#define is_leap(year) \
+	((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
+
+/* make sure the rtc_time values are in bounds */
+
+static int pcf8563_validate_tm(struct rtc_time *tm)
+{
+	int year = tm->tm_year + 1900;
+
+	if ((tm->tm_year < 70) || (tm->tm_year > 255))
+		return -EINVAL;
+
+	if ((tm->tm_mon > 11) || (tm->tm_mday == 0))
+		return -EINVAL;
+
+	if (tm->tm_mday > days_in_mo[tm->tm_mon]
+		+ ((tm->tm_mon == 1) && is_leap(year)))
+		return -EINVAL;
+
+	if ((tm->tm_hour >= 24) || (tm->tm_min >= 60) || (tm->tm_sec >= 60))
+		return -EINVAL;
+
+	return 0;
+}
+
+/*
+ * In the routines that deal directly with the pcf8563 hardware, we use
+ * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
+ */
+static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
+{
+	unsigned char buf[13];
+	unsigned char addr = PCF8563_REG_ST1;
+
+	struct i2c_msg msgs[] = {
+		{ client->addr, 0, 1, &addr },	/* setup read ptr */
+		{ client->addr, I2C_M_RD, 13, buf },	/* read status + date */
+	};
+
+	/* read registers */
+	if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
+		dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
+		return -EIO;
+	}
+
+	if (buf[PCF8563_REG_SC] & PCF8563_SC_LV)
+		dev_info(&client->dev,
+			"low voltage detected, date/time is not reliable.\n");
+
+	dev_dbg(&client->dev,
+		"%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
+		"mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
+		__FUNCTION__,
+		buf[0], buf[1], buf[2], buf[3],
+		buf[4], buf[5], buf[6], buf[7],
+		buf[8]);
+
+
+	tm->tm_sec = BCD2BIN(buf[PCF8563_REG_SC] & 0x7F);
+	tm->tm_min = BCD2BIN(buf[PCF8563_REG_MN] & 0x7F);
+	tm->tm_hour = BCD2BIN(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
+	tm->tm_mday = BCD2BIN(buf[PCF8563_REG_DM] & 0x3F);
+	tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
+	tm->tm_mon = BCD2BIN(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
+	tm->tm_year = BCD2BIN(buf[PCF8563_REG_YR])
+		+ (buf[PCF8563_REG_MO] & PCF8563_MO_C ? 100 : 0);
+
+	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
+		"mday=%d, mon=%d, year=%d, wday=%d\n",
+		__FUNCTION__,
+		tm->tm_sec, tm->tm_min, tm->tm_hour,
+		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
+
+	if (pcf8563_validate_tm(tm) < 0) {
+		dev_err(&client->dev, "retrieved date/time is not valid.\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm,
+				int datetoo)
+{
+	int i, err;
+	unsigned char buf[9];
+
+	/* check if all values in the tm struct are correct */
+	if ((err = pcf8563_validate_tm(tm)) < 0)
+		return err;
+
+	dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
+		"mday=%d, mon=%d, year=%d, wday=%d\n",
+		__FUNCTION__,
+		tm->tm_sec, tm->tm_min, tm->tm_hour,
+		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
+
+	/* hours, minutes and seconds */
+	buf[PCF8563_REG_SC] = BIN2BCD(tm->tm_sec);
+	buf[PCF8563_REG_MN] = BIN2BCD(tm->tm_min);
+	buf[PCF8563_REG_HR] = BIN2BCD(tm->tm_hour);
+
+	/* should we also set the date? */
+	if (datetoo) {
+		buf[PCF8563_REG_DM] = BIN2BCD(tm->tm_mday);
+
+		/* month, 1 - 12 */
+		buf[PCF8563_REG_MO] = BIN2BCD(tm->tm_mon + 1);
+
+		/* year and century */
+		buf[PCF8563_REG_YR] = BIN2BCD(tm->tm_year % 100);
+		if (tm->tm_year / 100)
+			buf[PCF8563_REG_MO] |= PCF8563_MO_C;
+
+		buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
+	}
+
+	/* write register's data */
+	for (i = 0; i < (datetoo ? 7 : 3); i++) {
+		unsigned char data[2] = { PCF8563_REG_SC + i,
+						buf[PCF8563_REG_SC + i] };
+
+		err = i2c_master_send(client, data, sizeof(data));
+		if (err != sizeof(data)) {
+			dev_err(&client->dev,
+				"%s: err=%d addr=%02x, data=%02x\n",
+				__FUNCTION__, err, data[0], data[1]);
+			return -EIO;
+		}
+	};
+
+	return 0;
+}
+
+static int pcf8563_hctosys(struct i2c_client *client)
+{
+	int err;
+
+	struct rtc_time tm;
+	struct timespec tv;
+
+	err = pcf8563_command(client, PCF8563_CMD_GETDATETIME, &tm);
+
+	if (err) {
+		dev_err(&client->dev,
+			"Unable to set the system clock\n");
+		return err;
+	}
+
+	/* IMPORTANT: the RTC only stores whole seconds. It is arbitrary
+	 * whether it stores the most close value or the value with partial
+	 * seconds truncated. However, it is important that we use it to store
+	 * the truncated value. This is because otherwise it is necessary,
+	 * in an rtc sync function, to read both xtime.tv_sec and
+	 * xtime.tv_nsec. On some processors (i.e. ARM), an atomic read
+	 * of >32bits is not possible. So storing the most close value would
+	 * slow down the sync API. So here we have the truncated value and
+	 * the best guess is to add 0.5s.
+	 */
+
+	tv.tv_nsec = NSEC_PER_SEC >> 1;
+
+	/* WARNING: this is not the C library 'mktime' call, it is a built in
+	 * inline function from include/linux/time.h.  It expects (requires)
+	 * the month to be in the range 1-12
+	 */
+
+	tv.tv_sec  = mktime(tm.tm_year + 1900, tm.tm_mon + 1,
+				tm.tm_mday, tm.tm_hour,
+				tm.tm_min, tm.tm_sec);
+
+	do_settimeofday(&tv);
+
+	dev_info(&client->dev,
+		"setting the system clock to %d-%d-%d %d:%d:%d\n",
+		tm.tm_year + 1900, tm.tm_mon + 1,
+		tm.tm_mday, tm.tm_hour, tm.tm_min,
+		tm.tm_sec);
+
+	return 0;
+}
+
+struct pcf8563_limit
+{
+	unsigned char reg;
+	unsigned char mask;
+	unsigned char min;
+	unsigned char max;
+};
+
+static int pcf8563_validate_client(struct i2c_client *client)
+{
+	int i, xfer;
+
+	static const struct pcf8563_limit probe_limits_pattern[] = {
+		/* register, mask, min, max */
+		{ PCF8563_REG_SC,	0x7F,	0,	59	},
+		{ PCF8563_REG_MN,	0x7F,	0,	59	},
+		{ PCF8563_REG_HR,	0x3F,	0,	23	},
+		{ PCF8563_REG_DM,	0x3F,	0,	31	},
+		{ PCF8563_REG_MO,	0x1F,	0,	12	},
+		{ PCF8563_REG_YR,	0xFF,	0,	99	},
+	};
+
+	/* check limits (only registers with bcd values) */
+	for (i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) {
+		unsigned char addr, buf, value;
+
+		addr = probe_limits_pattern[i].reg;
+
+		struct i2c_msg msgs[2] = {
+			{ client->addr, 0, 2, &addr },
+			{ client->addr, I2C_M_RD, 1, &buf },
+		};
+
+		xfer = i2c_transfer(client->adapter, msgs, 2);
+
+		if (xfer != 2) {
+			dev_err(&client->adapter->dev,
+				"%s: could not read register %x\n",
+				__FUNCTION__, probe_limits_pattern[i].reg);
+
+			return -EIO;
+		}
+
+		value = BCD2BIN(buf & probe_limits_pattern[i].mask);
+
+		if (value > probe_limits_pattern[i].max ||
+			value < probe_limits_pattern[i].min) {
+			dev_dbg(&client->adapter->dev,
+				"%s: register=%x, lim pattern=%d, value=%d\n",
+				__FUNCTION__, probe_limits_pattern[i].reg, i, value);
+
+			return -ENODEV;
+		}
+	}
+
+	return 0;
+}
+
+static int pcf8563_attach(struct i2c_adapter *adapter)
+{
+	return i2c_probe(adapter, &addr_data, pcf8563_probe);
+}
+
+static int pcf8563_probe(struct i2c_adapter *adapter, int address, int kind)
+{
+	struct i2c_client *client;
+	struct pcf8563_data *data;
+
+	int err = 0;
+
+	dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
+		err = -ENODEV;
+		goto exit;
+	}
+
+	if (!(data = kzalloc(sizeof(struct pcf8563_data), GFP_KERNEL))) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	client = &data->client;
+	client->addr = address;
+	client->driver = &pcf8563_driver;
+	client->adapter	= adapter;
+
+	strlcpy(client->name, pcf8563_driver.name, I2C_NAME_SIZE);
+
+	i2c_set_clientdata(client, data);
+
+	/* Verify the chip is really an PCF8563 */
+	if (kind < 0) {
+		if (pcf8563_validate_client(client) < 0) {
+			err = -ENODEV;
+			goto exit_kfree;
+		}
+	}
+
+	/* Inform the i2c layer */
+	if ((err = i2c_attach_client(client)))
+		goto exit_kfree;
+
+	list_add(&data->list, &pcf8563_clients);
+
+	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
+
+	/* If requested, set the system time */
+	if (hctosys)
+		pcf8563_hctosys(client);
+
+	return 0;
+
+exit_kfree:
+	kfree(data);
+
+exit:
+	return err;
+}
+
+static int pcf8563_detach(struct i2c_client *client)
+{
+	int err;
+	struct pcf8563_data *data = i2c_get_clientdata(client);
+
+	if ((err = i2c_detach_client(client)))
+		return err;
+
+	list_del(&data->list);
+
+	kfree(data);
+
+	return 0;
+}
+
+static int pcf8563_command(struct i2c_client *client, unsigned int cmd,
+	void *param)
+{
+	if (param == NULL)
+		return -EINVAL;
+
+	if (!capable(CAP_SYS_TIME))
+		return -EACCES;
+
+	dev_dbg(&client->dev, "%s: cmd=%d\n", __FUNCTION__, cmd);
+
+	switch (cmd) {
+	case PCF8563_CMD_GETDATETIME:
+		return pcf8563_get_datetime(client, param);
+
+	case PCF8563_CMD_SETTIME:
+		return pcf8563_set_datetime(client, param, 0);
+
+	case PCF8563_CMD_SETDATETIME:
+		return pcf8563_set_datetime(client, param, 1);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int __init pcf8563_init(void)
+{
+	return i2c_add_driver(&pcf8563_driver);
+}
+
+static void __exit pcf8563_exit(void)
+{
+	i2c_del_driver(&pcf8563_driver);
+}
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("Philips PCF8563 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+EXPORT_SYMBOL_GPL(pcf8563_do_command);
+
+module_init(pcf8563_init);
+module_exit(pcf8563_exit);
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-nslu2/include/linux/pcf8563.h	2006-01-20 11:57:40.000000000 +0100
@@ -0,0 +1,27 @@
+/*
+ * pcf8563.h - defines for drivers/i2c/chips/pcf8563.c
+ * Copyright 2005 Tower Technologies
+ *
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ * Maintainers: http://www.nslu2-linux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __LINUX_PCF8563_H__
+#define __LINUX_PCF8563_H__
+
+/* commands */
+
+#define PCF8563_CMD_GETDATETIME	0
+#define PCF8563_CMD_SETTIME	1
+#define PCF8563_CMD_SETDATETIME	2
+#define PCF8563_CMD_GETALARM	3
+#define PCF8563_CMD_SETALARM	4
+
+extern int pcf8563_do_command(unsigned int cmd, void *arg);
+
+#endif /* __LINUX_PCF8563_H__ */
--- linux-nslu2.orig/drivers/i2c/chips/Kconfig	2006-01-20 11:55:58.000000000 +0100
+++ linux-nslu2/drivers/i2c/chips/Kconfig	2006-01-20 11:57:40.000000000 +0100
@@ -117,4 +117,13 @@ config SENSORS_MAX6875
 	  This driver can also be built as a module.  If so, the module
 	  will be called max6875.
 
+config RTC_PCF8563_I2C
+	tristate "Philips PCF8563 RTC"
+	depends on I2C && EXPERIMENTAL
+	help
+	  If you say yes here you get support for the Philips PCF8563
+	  Real Time Clock chip. This chip is used by the Iomega NAS100D.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called pcf8563.
 endmenu
--- linux-nslu2.orig/drivers/i2c/chips/Makefile	2006-01-20 11:55:58.000000000 +0100
+++ linux-nslu2/drivers/i2c/chips/Makefile	2006-01-20 11:58:08.000000000 +0100
@@ -12,6 +12,7 @@ obj-$(CONFIG_SENSORS_PCF8574)	+= pcf8574
 obj-$(CONFIG_SENSORS_PCF8591)	+= pcf8591.o
 obj-$(CONFIG_ISP1301_OMAP)	+= isp1301_omap.o
 obj-$(CONFIG_TPS65010)		+= tps65010.o
+obj-$(CONFIG_RTC_PCF8563_I2C)	+= pcf8563.o
 
 ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)
 EXTRA_CFLAGS += -DDEBUG