path: root/recipes/linux/linux-2.6.29/boc01/005-091008-isl12024.patch

Index: linux-2.6.29/drivers/misc/eeprom/at24.c
===================================================================
--- linux-2.6.29.orig/drivers/misc/eeprom/at24.c	2009-03-24 00:12:14.000000000 +0100
+++ linux-2.6.29/drivers/misc/eeprom/at24.c	2009-10-09 18:37:43.000000000 +0200
@@ -114,6 +114,8 @@
 	{ "spd", AT24_DEVICE_MAGIC(2048 / 8,
 		AT24_FLAG_READONLY | AT24_FLAG_IRUGO) },
 	{ "24c04", AT24_DEVICE_MAGIC(4096 / 8, 0) },
+	/* Intersil RTC/Unique-ID isl12024 eeprom handled here */
+	{ "isl12024-eeprom", AT24_DEVICE_MAGIC(4096 / 8, AT24_FLAG_ADDR16) },
 	/* 24rf08 quirk is handled at i2c-core */
 	{ "24c08", AT24_DEVICE_MAGIC(8192 / 8, 0) },
 	{ "24c16", AT24_DEVICE_MAGIC(16384 / 8, 0) },
Index: linux-2.6.29/drivers/rtc/Kconfig
===================================================================
--- linux-2.6.29.orig/drivers/rtc/Kconfig	2009-03-24 00:12:14.000000000 +0100
+++ linux-2.6.29/drivers/rtc/Kconfig	2009-10-09 18:37:43.000000000 +0200
@@ -128,6 +128,12 @@
 
 if I2C
 
+config RTC_DRV_ISL12024
+	tristate "Intersil 12024 RTC/Unique-ID"
+	help
+	  If you say yes ....
+	  This driver can also be built as a module.
+
 config RTC_DRV_DS1307
 	tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00"
 	help
Index: linux-2.6.29/drivers/rtc/Makefile
===================================================================
--- linux-2.6.29.orig/drivers/rtc/Makefile	2009-03-24 00:12:14.000000000 +0100
+++ linux-2.6.29/drivers/rtc/Makefile	2009-10-09 18:37:43.000000000 +0200
@@ -39,6 +39,7 @@
 obj-$(CONFIG_RTC_DRV_EP93XX)	+= rtc-ep93xx.o
 obj-$(CONFIG_RTC_DRV_FM3130)	+= rtc-fm3130.o
 obj-$(CONFIG_RTC_DRV_ISL1208)	+= rtc-isl1208.o
+obj-$(CONFIG_RTC_DRV_ISL12024)	+= rtc-isl12024.o
 obj-$(CONFIG_RTC_DRV_M41T80)	+= rtc-m41t80.o
 obj-$(CONFIG_RTC_DRV_M41T94)	+= rtc-m41t94.o
 obj-$(CONFIG_RTC_DRV_M48T35)	+= rtc-m48t35.o
Index: linux-2.6.29/drivers/rtc/rtc-isl12024.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.29/drivers/rtc/rtc-isl12024.c	2009-10-09 19:05:21.000000000 +0200
@@ -0,0 +1,498 @@
+/*
+ * Intersil ISL12024 class driver
+ *
+ *
+ * Copyright (C) 2007, CenoSYS (www.cenosys.com).
+ * 
+ * Guillaume Ligneul <guillaume.ligneul@gmail.com>
+ * Sylvain Giroudon <sylvain.giroudon@goobie.fr>
+ * Jeremy Laine <jeremy.laine@bolloretelecom.eu>
+ *
+ * This software program is licensed subject to the GNU General Public License
+ * (GPL).Version 2,June 1991, available at http://www.fsf.org/copyleft/gpl.html
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/delay.h>
+
+#define DRV_VERSION "0.3"
+
+#define ISL12024_CCR_BASE		0x30	/* Base address of CCR */
+#define ISL12024_ALM0_BASE		0x00	/* Base address of ALARM0 */
+#define ISL12024_INT_AL0E		0x20	/* Alarm 0 enable */
+
+/* Register map */
+
+/* device id section */
+#define ISL12024_REG_ID 0x20
+
+/* rtc section */
+#define ISL12024_REG_HR_MIL     (1<<7) /* 24h/12h mode */
+#define ISL12024_REG_HR_PM      (1<<5) /* PM/AM bit in 12h mode */
+#define ISL12024_REG_SC	 0x30
+#define ISL12024_REG_DT  0x33  /* Date */
+#define ISL12024_REG_MO  0x34  /* Month */
+#define ISL12024_REG_YR  0x35  /* Year */
+#define ISL12024_REG_DW  0x36
+#define ISL12024_REG_Y2K 0x37
+#define ISL12024_RTC_SECTION_LEN 8
+
+/* control/status section */
+#define ISL12024_REG_SR  0x3F
+#define ISL12024_REG_SR_BAT    (1<<7) /* battery */
+#define ISL12024_REG_SR_AL1    (1<<6) /* alarm 0 */
+#define ISL12024_REG_SR_AL0    (1<<5) /* alarm 1 */
+#define ISL12024_REG_SR_OSCF   (1<<4) /* oscillator fail */
+#define ISL12024_REG_SR_RWEL   (1<<2) /* register write enable latch */
+#define ISL12024_REG_SR_WEL    (1<<1) /* write enable latch */
+#define ISL12024_REG_SR_RTCF   (1<<0) /* rtc fail */
+#define ISL12024_REG_INT 0x11
+
+#define CCR_SEC			0
+#define CCR_MIN			1
+#define CCR_HOUR		2
+#define CCR_MDAY		3
+#define CCR_MONTH		4
+#define CCR_YEAR		5
+#define CCR_WDAY		6
+#define CCR_Y2K			7
+
+static int isl12024_get_status(struct i2c_client *client, unsigned char *sr);
+static int isl12024_fix_osc(struct i2c_client *client);
+
+static struct i2c_driver isl12024_driver;
+
+static int
+isl12024_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
+		       unsigned len)
+{
+	int ret;
+	u8  dt_addr[2];
+
+	struct i2c_msg msgs[2] = {
+			{
+					.addr	= client->addr,
+					.flags	= 0,
+					.len	= 2,
+					.buf	= dt_addr,
+			},
+			{
+					.addr	= client->addr,
+					.flags	= I2C_M_RD,
+					.len	= len ,
+					.buf	= buf,
+			},
+	};
+
+	dt_addr[0] = 0;
+	dt_addr[1] = reg;
+
+	ret = i2c_transfer(client->adapter, msgs, 2);
+	if ( ret < 0) {
+		dev_err(&client->dev, "read error\n");
+		return -EIO;
+	}
+	return ret;
+}
+
+
+static int
+isl12024_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
+		       unsigned len)
+{
+	int ret;
+	u8 i2c_buf[10];
+
+	struct i2c_msg msgs[1] = {
+			{
+				.addr	= client->addr,
+				.flags	= 0,
+				.len	= len+2,
+				.buf	= i2c_buf,
+			 },
+		};
+
+	i2c_buf[0] = 0;
+	i2c_buf[1] = reg;
+
+
+	memcpy(&i2c_buf[2], &buf[0], len );
+
+	ret = i2c_transfer(client->adapter, msgs, 1);
+	if ( ret < 0 )
+		dev_err(&client->dev, "i2c_transfer failed (%d)\n", ret);
+
+	return ret;
+}
+
+
+static int isl12024_i2c_validate_client(struct i2c_client *client)
+{
+	u8 regs[ISL12024_RTC_SECTION_LEN] = { 0, };
+	u8 zero_mask[ISL12024_RTC_SECTION_LEN] = {
+		0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8, 0xc6
+	};
+
+	int i;
+	int ret;
+
+	ret = isl12024_i2c_read_regs(client, ISL12024_REG_SC, regs, ISL12024_RTC_SECTION_LEN);
+
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < ISL12024_RTC_SECTION_LEN; ++i) {
+		if (regs[i] & zero_mask[i]) /* check if bits are cleared */
+			return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int isl12024_read_time(struct i2c_client *client,
+				 struct rtc_time *tm)
+{
+	unsigned char sr;
+	int err;
+	u8 regs[ISL12024_RTC_SECTION_LEN] = { 0, };
+
+	if (isl12024_get_status(client, &sr) < 0) {
+		dev_err(&client->dev, "reading SR failed\n");
+		return -EIO;
+	}
+
+	err = isl12024_i2c_read_regs(client, ISL12024_REG_SC, regs, ISL12024_RTC_SECTION_LEN);
+
+	if (err < 0) {
+		dev_err(&client->dev, "reading RTC section failed\n");
+		return err;
+	}
+
+	tm->tm_sec = bcd2bin(regs[0]);
+	tm->tm_min = bcd2bin(regs[1]);
+
+	{ /* HR field has a more complex interpretation */
+		const u8 _hr = regs[2];
+		if (_hr & ISL12024_REG_HR_MIL) /* 24h format */
+			tm->tm_hour = bcd2bin(_hr & 0x3f);
+		else { // 12h format
+			tm->tm_hour = bcd2bin(_hr & 0x1f);
+			if (_hr & ISL12024_REG_HR_PM) /* PM flag set */
+				tm->tm_hour += 12;
+		}
+	}
+
+	tm->tm_mday = bcd2bin(regs[3]);
+	tm->tm_mon  = bcd2bin(regs[4]);
+	tm->tm_year = bcd2bin(regs[5]) + 100;
+	tm->tm_wday = bcd2bin(regs[6]);
+
+	return rtc_valid_tm(tm);
+}
+
+static int isl12024_get_status(struct i2c_client *client, unsigned char *sr)
+{
+	static unsigned char sr_addr[2] = { 0, ISL12024_REG_SR };
+
+	struct i2c_msg msgs[] = {
+		{ client->addr, 0, 2, sr_addr },	/* setup read ptr */
+		{ client->addr, I2C_M_RD, 1, sr },	/* read status */
+	};
+
+	/* read status register */
+	if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
+		dev_err(&client->dev, "%s: read error\n", __func__);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+
+static int isl12024_set_datetime(struct i2c_client *client, struct rtc_time *tm,
+			int datetoo, u8 reg_base, unsigned char alm_enable)
+{
+	int i, xfer, nbytes;
+	unsigned char buf[8];
+	unsigned char rdata[10] = { 0, reg_base };
+
+	static const unsigned char wel[3] = { 0, ISL12024_REG_SR,
+						ISL12024_REG_SR_WEL };
+
+	static const unsigned char rwel[3] = { 0, ISL12024_REG_SR,
+						ISL12024_REG_SR_WEL | ISL12024_REG_SR_RWEL };
+
+	static const unsigned char diswe[3] = { 0, ISL12024_REG_SR, 0 };
+
+	dev_dbg(&client->dev,
+		"%s: secs=%d, mins=%d, hours=%d\n",
+		__func__,
+		tm->tm_sec, tm->tm_min, tm->tm_hour);
+
+	buf[CCR_SEC] = bin2bcd(tm->tm_sec);
+	buf[CCR_MIN] = bin2bcd(tm->tm_min);
+
+	/* set hour and 24hr bit */
+	buf[CCR_HOUR] = bin2bcd(tm->tm_hour) | ISL12024_REG_HR_MIL;
+
+	/* should we also set the date? */
+	if (datetoo) {
+		dev_dbg(&client->dev,
+			"%s: mday=%d, mon=%d, year=%d, wday=%d\n",
+			__func__,
+			tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
+
+		buf[CCR_MDAY] = bin2bcd(tm->tm_mday);
+
+		/* month, 1 - 12 */
+		buf[CCR_MONTH] = bin2bcd(tm->tm_mon);
+
+		/* year, since the rtc epoch*/
+		buf[CCR_YEAR] = bin2bcd(tm->tm_year % 100);
+		buf[CCR_WDAY] = tm->tm_wday & 0x07;
+		buf[CCR_Y2K] = bin2bcd(tm->tm_year / 100);
+	}
+
+	/* If writing alarm registers, set compare bits on registers 0-4 */
+	if (reg_base < ISL12024_CCR_BASE)
+		for (i = 0; i <= 4; i++)
+			buf[i] |= 0x80;
+
+	/* this sequence is required to unlock the chip */
+	if ((xfer = i2c_master_send(client, wel, 3)) != 3) {
+		dev_err(&client->dev, "%s: wel - %d\n", __func__, xfer);
+		return -EIO;
+	}
+
+	if ((xfer = i2c_master_send(client, rwel, 3)) != 3) {
+		dev_err(&client->dev, "%s: rwel - %d\n", __func__, xfer);
+		return -EIO;
+	}
+
+
+	/* write register's data */
+	if (datetoo)
+		nbytes = 8;
+	else
+		nbytes = 3;
+	for (i = 0; i < nbytes; i++)
+		rdata[2+i] = buf[i];
+
+	xfer = i2c_master_send(client, rdata, nbytes+2);
+	if (xfer != nbytes+2) {
+		dev_err(&client->dev,
+			"%s: result=%d addr=%02x, data=%02x\n",
+			__func__,
+			 xfer, rdata[1], rdata[2]);
+		return -EIO;
+	}
+
+	/* If we wrote to the nonvolatile region, wait 10msec for write cycle*/
+	if (reg_base < ISL12024_CCR_BASE) {
+		unsigned char al0e[3] = { 0, ISL12024_REG_INT, 0 };
+
+		msleep(10);
+
+		/* ...and set or clear the AL0E bit in the INT register */
+
+		/* Need to set RWEL again as the write has cleared it */
+		xfer = i2c_master_send(client, rwel, 3);
+		if (xfer != 3) {
+			dev_err(&client->dev,
+				"%s: aloe rwel - %d\n",
+				__func__,
+				xfer);
+			return -EIO;
+		}
+
+		if (alm_enable)
+			al0e[2] = ISL12024_INT_AL0E;
+
+		xfer = i2c_master_send(client, al0e, 3);
+		if (xfer != 3) {
+			dev_err(&client->dev,
+				"%s: al0e - %d\n",
+				__func__,
+				xfer);
+			return -EIO;
+		}
+
+		/* and wait 10msec again for this write to complete */
+		msleep(10);
+	}
+
+	/* disable further writes */
+	if ((xfer = i2c_master_send(client, diswe, 3)) != 3) {
+		dev_err(&client->dev, "%s: diswe - %d\n", __func__, xfer);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int isl12024_fix_osc(struct i2c_client *client)
+{
+	int err;
+	struct rtc_time tm;
+
+	tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+
+	err = isl12024_set_datetime(client, &tm, 0, ISL12024_CCR_BASE, 0);
+	if ( err < 0 )
+		dev_err(&client->dev, "unable to restart the oscillator (%d)\n", err);
+
+	return err;
+}
+
+static int isl12024_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	return isl12024_read_time(to_i2c_client(dev), tm);
+
+}
+
+static int isl12024_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	return isl12024_set_datetime(to_i2c_client(dev),
+			tm, 1, ISL12024_CCR_BASE, 0);
+}
+
+static int
+isl12024_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+
+	/* Nothing to do */
+
+	return 0;
+}
+
+static const struct rtc_class_ops isl12024_rtc_ops = {
+	.proc		= isl12024_rtc_proc,
+	.read_time	= isl12024_rtc_read_time,
+	.set_time	= isl12024_rtc_set_time,
+};
+
+static ssize_t isl12024_show_id(struct device *dev, struct device_attribute *attr,
+			    char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int err;
+	int len = 0;
+	int i;
+	u8 id_buffer[ISL12024_RTC_SECTION_LEN];
+
+	/* Read unique id from eeprom */
+	err = isl12024_i2c_read_regs(client, ISL12024_REG_ID, id_buffer, sizeof(id_buffer));
+	if (err < 0) {
+		dev_err(&client->dev, "reading RTC section failed\n");
+		return err;
+	}
+
+	/* Print hexadecimal */
+	for (i = 0; i < sizeof(id_buffer); i++)
+		len += sprintf(buf + len, "%02X", id_buffer[i]);
+	len += sprintf(buf + len, "\n");
+	return len;
+}
+
+static DEVICE_ATTR(id, S_IRUGO, isl12024_show_id, NULL);
+
+static int
+isl12024_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	int rc = 0;
+	unsigned char sr;
+	struct rtc_device *rtc = NULL;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+		return -ENODEV;
+
+	if (isl12024_i2c_validate_client(client) < 0)
+		return -ENODEV;
+
+        dev_info(&client->dev,
+                 "chip found, driver version " DRV_VERSION "\n");
+
+	rtc = rtc_device_register(isl12024_driver.driver.name,
+				  &client->dev, &isl12024_rtc_ops,
+				  THIS_MODULE);
+
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
+
+	i2c_set_clientdata(client, rtc);
+
+	rc = isl12024_get_status(client, &sr);
+        if (rc < 0) {
+                dev_err(&client->dev, "reading status failed\n");
+                goto exit_unregister;
+        }
+
+	/* Check for power failures and enable the osc */
+	if (sr & ISL12024_REG_SR_RTCF) {
+		dev_warn(&client->dev, "rtc power failure detected, "
+			 "please set clock.\n");
+		udelay(50);
+		isl12024_fix_osc(client);
+	}
+
+	/* Register sysfs hooks */
+	rc = device_create_file(&client->dev, &dev_attr_id);
+	if (rc < 0)
+		goto exit_unregister;
+
+	return 0;
+
+exit_unregister:
+	rtc_device_unregister(rtc);
+
+	return rc;
+}
+
+static int
+isl12024_remove(struct i2c_client *client)
+{
+	struct rtc_device *rtc = i2c_get_clientdata(client);
+
+	rtc_device_unregister(rtc);
+	device_remove_file(&client->dev, &dev_attr_id);
+
+	return 0;
+}
+
+static const struct i2c_device_id isl12024_id[] = {
+        { "isl12024", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, isl12024_id);
+
+static struct i2c_driver isl12024_driver = {
+        .driver = {
+                   .name = "rtc-isl12024",
+                   },
+        .probe = isl12024_probe,
+        .remove = isl12024_remove,
+        .id_table = isl12024_id,
+};
+
+/* module init/exit */
+
+static int __init isl12024_init(void)
+{
+	return i2c_add_driver(&isl12024_driver);
+}
+
+static void __exit isl12024_exit(void)
+{
+	i2c_del_driver(&isl12024_driver);
+}
+
+MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@cenosys.com>");
+MODULE_DESCRIPTION("Intersil ISL12024 driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(isl12024_init);
+module_exit(isl12024_exit);