Resend...
---
drivers/i2c/chips/m41t00.c | 294 ++++++++++++++++++++++++++++++++++-----------
include/linux/m41t00.h | 50 +++++++
2 files changed, 276 insertions(+), 68 deletions(-)
---
diff -Nurp linux-2.6.16-mm1-cleanup/drivers/i2c/chips/m41t00.c linux-2.6.16-mm1-newsupp/drivers/i2c/chips/m41t00.c
--- linux-2.6.16-mm1-cleanup/drivers/i2c/chips/m41t00.c 2006-03-27 16:00:35.000000000 -0700
+++ linux-2.6.16-mm1-newsupp/drivers/i2c/chips/m41t00.c 2006-03-27 16:49:35.000000000 -0700
@@ -1,5 +1,5 @@
/*
- * I2C client/driver for the ST M41T00 Real-Time Clock chip.
+ * I2C client/driver for the ST M41T00 family of i2c rtc chips.
*
* Author: Mark A. Greer <mgreer at mvista.com>
*
@@ -19,21 +19,17 @@
#include <linux/i2c.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
-#include <linux/mutex.h>
#include <linux/workqueue.h>
-
+#include <linux/platform_device.h>
+#include <linux/m41t00.h>
#include <asm/time.h>
#include <asm/rtc.h>
-#define M41T00_DRV_NAME "m41t00"
-
-static DEFINE_MUTEX(m41t00_mutex);
-
static struct i2c_driver m41t00_driver;
static struct i2c_client *save_client;
static unsigned short ignore[] = { I2C_CLIENT_END };
-static unsigned short normal_addr[] = { 0x68, I2C_CLIENT_END };
+static unsigned short normal_addr[] = { 0, I2C_CLIENT_END };
static struct i2c_client_address_data addr_data = {
.normal_i2c = normal_addr,
@@ -41,34 +37,55 @@ static struct i2c_client_address_data ad
.ignore = ignore,
};
+struct m41t00_chip_info {
+ u16 type;
+ u16 read_limit;
+ u8 sec; /* Offsets for chip regs */
+ u8 min;
+ u8 hour;
+ u8 day;
+ u8 mon;
+ u8 year;
+ u8 alarm_mon;
+ u8 alarm_hour;
+ u8 sqw;
+ u32 sqw_freq;
+};
+
+static struct m41t00_chip_info m41t00_chip_info_tbl[] = {
+ { M41T00_TYPE_M41T00, 5, 0, 1, 2, 4, 5, 6, 0, 0, 0, 0 },
+ { M41T00_TYPE_M41T81, 1, 1, 2, 3, 5, 6, 7, 0xa, 0xc, 0x13, 0 },
+ { M41T00_TYPE_M41T85, 1, 1, 2, 3, 5, 6, 7, 0xa, 0xc, 0x13, 0 },
+};
+static struct m41t00_chip_info *m41t00_chip;
+
ulong
m41t00_get_rtc_time(void)
{
s32 sec, min, hour, day, mon, year;
s32 sec1, min1, hour1, day1, mon1, year1;
- ulong limit = 10;
+ u16 reads = 0;
+ u8 buf[8], msgbuf[1] = { 0 }; /* offset into rtc's regs */
+ struct i2c_msg msgs[] = {
+ {
+ .addr = save_client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = msgbuf,
+ },
+ {
+ .addr = save_client->addr,
+ .flags = I2C_M_RD,
+ .len = 8,
+ .buf = buf,
+ },
+ };
sec = min = hour = day = mon = year = 0;
- sec1 = min1 = hour1 = day1 = mon1 = year1 = 0;
- mutex_lock(&m41t00_mutex);
do {
- if (((sec = i2c_smbus_read_byte_data(save_client, 0)) >= 0)
- && ((min = i2c_smbus_read_byte_data(save_client, 1))
- >= 0)
- && ((hour = i2c_smbus_read_byte_data(save_client, 2))
- >= 0)
- && ((day = i2c_smbus_read_byte_data(save_client, 4))
- >= 0)
- && ((mon = i2c_smbus_read_byte_data(save_client, 5))
- >= 0)
- && ((year = i2c_smbus_read_byte_data(save_client, 6))
- >= 0)
- && ((sec == sec1) && (min == min1) && (hour == hour1)
- && (day == day1) && (mon == mon1)
- && (year == year1)))
-
- break;
+ if (i2c_transfer(save_client->adapter, msgs, 2) < 0)
+ goto read_err;
sec1 = sec;
min1 = min;
@@ -76,21 +93,21 @@ m41t00_get_rtc_time(void)
day1 = day;
mon1 = mon;
year1 = year;
- } while (--limit > 0);
- mutex_unlock(&m41t00_mutex);
-
- if (limit == 0) {
- dev_warn(&save_client->dev,
- "m41t00: can't read rtc chip\n");
- sec = min = hour = day = mon = year = 0;
- }
- sec &= 0x7f;
- min &= 0x7f;
- hour &= 0x3f;
- day &= 0x3f;
- mon &= 0x1f;
- year &= 0xff;
+ sec = buf[m41t00_chip->sec] & 0x7f;
+ min = buf[m41t00_chip->min] & 0x7f;
+ hour = buf[m41t00_chip->hour] & 0x3f;
+ day = buf[m41t00_chip->day] & 0x3f;
+ mon = buf[m41t00_chip->mon] & 0x1f;
+ year = buf[m41t00_chip->year] & 0xff;
+ } while ((++reads < m41t00_chip->read_limit) && ((sec != sec1)
+ || (min != min1) || (hour != hour1) || (day != day1)
+ || (mon != mon1) || (year != year1)));
+
+ if ((m41t00_chip->read_limit > 1) && ((sec != sec1) || (min != min1)
+ || (hour != hour1) || (day != day1) || (mon != mon1)
+ || (year != year1)))
+ goto read_err;
sec = BCD2BIN(sec);
min = BCD2BIN(min);
@@ -104,40 +121,59 @@ m41t00_get_rtc_time(void)
year += 100;
return mktime(year, mon, day, hour, min, sec);
+
+read_err:
+ dev_err(&save_client->dev, "m41t00_get_rtc_time: Read error\n");
+ return 0;
}
static void
m41t00_set(void *arg)
{
struct rtc_time tm;
- ulong nowtime = *(ulong *)arg;
+ int nowtime = *(int *)arg;
+ s32 sec, min, hour, day, mon, year;
+ u8 wbuf[9], *buf = &wbuf[1], msgbuf[1] = { 0 };
+ struct i2c_msg msgs[] = {
+ {
+ .addr = save_client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = msgbuf,
+ },
+ {
+ .addr = save_client->addr,
+ .flags = I2C_M_RD,
+ .len = 8,
+ .buf = buf,
+ },
+ };
to_tm(nowtime, &tm);
tm.tm_year = (tm.tm_year - 1900) % 100;
- tm.tm_sec = BIN2BCD(tm.tm_sec);
- tm.tm_min = BIN2BCD(tm.tm_min);
- tm.tm_hour = BIN2BCD(tm.tm_hour);
- tm.tm_mon = BIN2BCD(tm.tm_mon);
- tm.tm_mday = BIN2BCD(tm.tm_mday);
- tm.tm_year = BIN2BCD(tm.tm_year);
-
- mutex_lock(&m41t00_mutex);
- if ((i2c_smbus_write_byte_data(save_client, 0, tm.tm_sec & 0x7f) < 0)
- || (i2c_smbus_write_byte_data(save_client, 1, tm.tm_min & 0x7f)
- < 0)
- || (i2c_smbus_write_byte_data(save_client, 2, tm.tm_hour & 0x7f)
- < 0)
- || (i2c_smbus_write_byte_data(save_client, 4, tm.tm_mday & 0x7f)
- < 0)
- || (i2c_smbus_write_byte_data(save_client, 5, tm.tm_mon & 0x7f)
- < 0)
- || (i2c_smbus_write_byte_data(save_client, 6, tm.tm_year & 0x7f)
- < 0))
+ sec = BIN2BCD(tm.tm_sec);
+ min = BIN2BCD(tm.tm_min);
+ hour = BIN2BCD(tm.tm_hour);
+ day = BIN2BCD(tm.tm_mday);
+ mon = BIN2BCD(tm.tm_mon);
+ year = BIN2BCD(tm.tm_year);
+
+ /* Read reg values into buf[0..7]/wbuf[1..8] */
+ if (i2c_transfer(save_client->adapter, msgs, 2) < 0) {
+ dev_err(&save_client->dev, "m41t00_set: Read error\n");
+ return;
+ }
- dev_warn(&save_client->dev,"m41t00: can't write to rtc chip\n");
+ wbuf[0] = 0; /* offset into rtc's regs */
+ buf[m41t00_chip->sec] = (buf[m41t00_chip->sec] & ~0x7f) | (sec & 0x7f);
+ buf[m41t00_chip->min] = (buf[m41t00_chip->min] & ~0x7f) | (min & 0x7f);
+ buf[m41t00_chip->hour] = (buf[m41t00_chip->hour]& ~0x3f) | (hour& 0x3f);
+ buf[m41t00_chip->day] = (buf[m41t00_chip->day] & ~0x3f) | (day & 0x3f);
+ buf[m41t00_chip->mon] = (buf[m41t00_chip->mon] & ~0x1f) | (mon & 0x1f);
- mutex_unlock(&m41t00_mutex);
+ if (i2c_master_send(save_client, wbuf, 9) < 0)
+ dev_err(&save_client->dev, "m41t00_set: Write error\n");
}
static ulong new_time;
@@ -160,6 +196,47 @@ m41t00_set_rtc_time(ulong nowtime)
/*
*****************************************************************************
*
+ * platform_data Driver Interface
+ *
+ *****************************************************************************
+ */
+static int __init
+m41t00_platform_probe(struct platform_device *pdev)
+{
+ struct m41t00_platform_data *pdata;
+ int i;
+
+ if (pdev && (pdata = pdev->dev.platform_data)) {
+ normal_addr[0] = pdata->i2c_addr;
+
+ for (i=0; i<ARRAY_SIZE(m41t00_chip_info_tbl); i++)
+ if (m41t00_chip_info_tbl[i].type == pdata->type) {
+ m41t00_chip = &m41t00_chip_info_tbl[i];
+ m41t00_chip->sqw_freq = pdata->sqw_freq;
+ return 0;
+ }
+ }
+ return -ENODEV;
+}
+
+static int __exit
+m41t00_platform_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static struct platform_driver m41t00_platform_driver = {
+ .probe = m41t00_platform_probe,
+ .remove = m41t00_platform_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = M41T00_DRV_NAME,
+ },
+};
+
+/*
+ *****************************************************************************
+ *
* Driver Interface
*
*****************************************************************************
@@ -169,24 +246,100 @@ m41t00_probe(struct i2c_adapter *adap, i
{
struct i2c_client *client;
int rc;
+ u8 rbuf[1], wbuf[2], msgbuf[1] = { 0 }; /* offset into rtc's regs */
+ struct i2c_msg msgs[] = {
+ {
+ .addr = 0,
+ .flags = 0,
+ .len = 1,
+ .buf = msgbuf,
+ },
+ {
+ .addr = 0,
+ .flags = I2C_M_RD,
+ .len = 1,
+ .buf = rbuf,
+ },
+ };
client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (!client)
return -ENOMEM;
- strlcpy(client->name, M41T00_DRV_NAME, I2C_NAME_SIZE);
+ strlcpy(client->name, m41t00_driver.driver.name, I2C_NAME_SIZE);
client->addr = addr;
client->adapter = adap;
client->driver = &m41t00_driver;
- if ((rc = i2c_attach_client(client)) != 0) {
- kfree(client);
- return rc;
+ if ((rc = i2c_attach_client(client)) != 0)
+ goto attach_err;
+
+ msgs[0].addr = addr;
+ msgs[1].addr = addr;
+
+ if (m41t00_chip->type != M41T00_TYPE_M41T00) {
+ /* If asked, set SQW frequency & enable */
+ if (m41t00_chip->sqw_freq) {
+ msgbuf[0] = m41t00_chip->alarm_mon;
+ if ((rc = i2c_transfer(client->adapter, msgs, 2)) < 0)
+ goto sqw_err;
+
+ wbuf[0] = m41t00_chip->alarm_mon;
+ wbuf[1] = rbuf[0] & ~0x40;
+ if ((rc = i2c_master_send(client, wbuf, 2)) < 0)
+ goto sqw_err;
+
+ wbuf[0] = m41t00_chip->sqw;
+ wbuf[1] = m41t00_chip->sqw_freq;
+ if ((rc = i2c_master_send(client, wbuf, 2)) < 0)
+ goto sqw_err;
+
+ wbuf[0] = m41t00_chip->alarm_mon;
+ wbuf[1] = rbuf[0] | 0x40;
+ if ((rc = i2c_master_send(client, wbuf, 2)) < 0)
+ goto sqw_err;
+ }
+
+ /* Make sure HT (Halt Update) bit is cleared */
+ msgbuf[0] = m41t00_chip->alarm_hour;
+ if ((rc = i2c_transfer(client->adapter, msgs, 2)) < 0)
+ goto ht_err;
+
+ if (rbuf[0] & 0x40) {
+ wbuf[0] = m41t00_chip->alarm_hour;
+ wbuf[1] = rbuf[0] & ~0x40;
+ if ((rc = i2c_master_send(client, wbuf, 2)) < 0)
+ goto ht_err;
+ }
+ }
+
+ /* Make sure ST (stop) bit is cleared */
+ msgbuf[0] = m41t00_chip->sec;
+ if ((rc = i2c_transfer(client->adapter, msgs, 2)) < 0)
+ goto st_err;
+
+ if (rbuf[0] & 0x80) {
+ wbuf[0] = m41t00_chip->sec;
+ wbuf[1] = rbuf[0] & ~0x80;
+ if ((rc = i2c_master_send(client, wbuf, 2)) < 0)
+ goto st_err;
}
m41t00_wq = create_singlethread_workqueue("m41t00");
save_client = client;
return 0;
+
+st_err:
+ dev_err(&client->dev, "m41t00_probe: Can't clear ST bit\n");
+ goto attach_err;
+ht_err:
+ dev_err(&client->dev, "m41t00_probe: Can't clear HT bit\n");
+ goto attach_err;
+sqw_err:
+ dev_err(&client->dev, "m41t00_probe: Can't set SQW Frequency\n");
+attach_err:
+ kfree(client);
+ return rc;
}
static int
@@ -219,13 +372,18 @@ static struct i2c_driver m41t00_driver =
static int __init
m41t00_init(void)
{
- return i2c_add_driver(&m41t00_driver);
+ int rc;
+
+ if (!(rc = platform_driver_register(&m41t00_platform_driver)))
+ rc = i2c_add_driver(&m41t00_driver);
+ return rc;
}
static void __exit
m41t00_exit(void)
{
i2c_del_driver(&m41t00_driver);
+ platform_driver_unregister(&m41t00_platform_driver);
}
module_init(m41t00_init);
diff -Nurp linux-2.6.16-mm1-cleanup/include/linux/m41t00.h linux-2.6.16-mm1-newsupp/include/linux/m41t00.h
--- linux-2.6.16-mm1-cleanup/include/linux/m41t00.h 1969-12-31 17:00:00.000000000 -0700
+++ linux-2.6.16-mm1-newsupp/include/linux/m41t00.h 2006-03-27 16:25:51.000000000 -0700
@@ -0,0 +1,50 @@
+/*
+ * Definitions for the ST M41T00 family of i2c rtc chips.
+ *
+ * Author: Mark A. Greer <mgreer at mvista.com>
+ *
+ * 2005 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#ifndef _M41T00_H
+#define _M41T00_H
+
+#define M41T00_DRV_NAME "m41t00"
+#define M41T00_I2C_ADDR 0x68
+
+#define M41T00_TYPE_M41T00 0
+#define M41T00_TYPE_M41T81 81
+#define M41T00_TYPE_M41T85 85
+
+struct m41t00_platform_data {
+ u16 type;
+ u16 i2c_addr;
+ u32 sqw_freq;
+};
+
+/* SQW output disabled, this is default value by power on*/
+#define SQW_FREQ_DISABLE (0)
+
+#define SQW_FREQ_32KHZ (1<<4) /* 32.768 KHz */
+#define SQW_FREQ_8KHZ (2<<4) /* 8.192 KHz */
+#define SQW_FREQ_4KHZ (3<<4) /* 4.096 KHz */
+#define SQW_FREQ_2KHZ (4<<4) /* 2.048 KHz */
+#define SQW_FREQ_1KHZ (5<<4) /* 1.024 KHz */
+#define SQW_FREQ_512HZ (6<<4) /* 512 Hz */
+#define SQW_FREQ_256HZ (7<<4) /* 256 Hz */
+#define SQW_FREQ_128HZ (8<<4) /* 128 Hz */
+#define SQW_FREQ_64HZ (9<<4) /* 64 Hz */
+#define SQW_FREQ_32HZ (10<<4) /* 32 Hz */
+#define SQW_FREQ_16HZ (11<<4) /* 16 Hz */
+#define SQW_FREQ_8HZ (12<<4) /* 8 Hz */
+#define SQW_FREQ_4HZ (13<<4) /* 4 Hz */
+#define SQW_FREQ_2HZ (14<<4) /* 2 Hz */
+#define SQW_FREQ_1HZ (15<<4) /* 1 Hz */
+
+extern ulong m41t00_get_rtc_time(void);
+extern int m41t00_set_rtc_time(ulong nowtime);
+
+#endif /* _M41T00_H */
