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-rw-r--r--drivers/i2c/chips/Kconfig9
-rw-r--r--drivers/i2c/chips/Makefile1
-rw-r--r--drivers/i2c/chips/ds1337.c3
-rw-r--r--drivers/i2c/chips/ds1374.c7
-rw-r--r--drivers/i2c/chips/eeprom.c9
-rw-r--r--drivers/i2c/chips/isp1301_omap.c1
-rw-r--r--drivers/i2c/chips/m41t00.c4
-rw-r--r--drivers/i2c/chips/max6875.c6
-rw-r--r--drivers/i2c/chips/pca9539.c3
-rw-r--r--drivers/i2c/chips/pcf8574.c5
-rw-r--r--drivers/i2c/chips/pcf8591.c5
-rw-r--r--drivers/i2c/chips/rtc8564.c5
-rw-r--r--drivers/i2c/chips/tps65010.c3
-rw-r--r--drivers/i2c/chips/x1205.c698
14 files changed, 728 insertions, 31 deletions
diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig
index 6bd44a44cd2..f9fae28f561 100644
--- a/drivers/i2c/chips/Kconfig
+++ b/drivers/i2c/chips/Kconfig
@@ -126,4 +126,13 @@ config SENSORS_MAX6875
This driver can also be built as a module. If so, the module
will be called max6875.
+config RTC_X1205_I2C
+ tristate "Xicor X1205 RTC chip"
+ depends on I2C && EXPERIMENTAL
+ help
+ If you say yes here you get support for the Xicor X1205 RTC chip.
+
+ This driver can also be built as a module. If so, the module
+ will be called x1205.
+
endmenu
diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile
index a876dd42b86..46178b57b1f 100644
--- a/drivers/i2c/chips/Makefile
+++ b/drivers/i2c/chips/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
obj-$(CONFIG_SENSORS_RTC8564) += rtc8564.o
obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o
obj-$(CONFIG_TPS65010) += tps65010.o
+obj-$(CONFIG_RTC_X1205_I2C) += x1205.o
ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)
EXTRA_CFLAGS += -DDEBUG
diff --git a/drivers/i2c/chips/ds1337.c b/drivers/i2c/chips/ds1337.c
index 9d3175c0339..01b03700741 100644
--- a/drivers/i2c/chips/ds1337.c
+++ b/drivers/i2c/chips/ds1337.c
@@ -243,11 +243,10 @@ static int ds1337_detect(struct i2c_adapter *adapter, int address, int kind)
I2C_FUNC_I2C))
goto exit;
- if (!(data = kmalloc(sizeof(struct ds1337_data), GFP_KERNEL))) {
+ if (!(data = kzalloc(sizeof(struct ds1337_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
- memset(data, 0, sizeof(struct ds1337_data));
INIT_LIST_HEAD(&data->list);
/* The common I2C client data is placed right before the
diff --git a/drivers/i2c/chips/ds1374.c b/drivers/i2c/chips/ds1374.c
index 0936327a946..da488b735ab 100644
--- a/drivers/i2c/chips/ds1374.c
+++ b/drivers/i2c/chips/ds1374.c
@@ -167,7 +167,8 @@ static void ds1374_set_tlet(ulong arg)
static ulong new_time;
-DECLARE_TASKLET_DISABLED(ds1374_tasklet, ds1374_set_tlet, (ulong) & new_time);
+static DECLARE_TASKLET_DISABLED(ds1374_tasklet, ds1374_set_tlet,
+ (ulong) & new_time);
int ds1374_set_rtc_time(ulong nowtime)
{
@@ -193,13 +194,11 @@ static int ds1374_probe(struct i2c_adapter *adap, int addr, int kind)
struct i2c_client *client;
int rc;
- client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
+ client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (!client)
return -ENOMEM;
- memset(client, 0, sizeof(struct i2c_client));
strncpy(client->name, DS1374_DRV_NAME, I2C_NAME_SIZE);
- client->flags = I2C_DF_NOTIFY;
client->addr = addr;
client->adapter = adap;
client->driver = &ds1374_driver;
diff --git a/drivers/i2c/chips/eeprom.c b/drivers/i2c/chips/eeprom.c
index d58403a4790..4baf573fa04 100644
--- a/drivers/i2c/chips/eeprom.c
+++ b/drivers/i2c/chips/eeprom.c
@@ -88,8 +88,8 @@ static void eeprom_update_client(struct i2c_client *client, u8 slice)
dev_dbg(&client->dev, "Starting eeprom update, slice %u\n", slice);
if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
- for (i = slice << 5; i < (slice + 1) << 5; i += I2C_SMBUS_I2C_BLOCK_MAX)
- if (i2c_smbus_read_i2c_block_data(client, i, data->data + i) != I2C_SMBUS_I2C_BLOCK_MAX)
+ for (i = slice << 5; i < (slice + 1) << 5; i += I2C_SMBUS_BLOCK_MAX)
+ if (i2c_smbus_read_i2c_block_data(client, i, data->data + i) != I2C_SMBUS_BLOCK_MAX)
goto exit;
} else {
if (i2c_smbus_write_byte(client, slice << 5)) {
@@ -155,7 +155,7 @@ static int eeprom_attach_adapter(struct i2c_adapter *adapter)
}
/* This function is called by i2c_probe */
-int eeprom_detect(struct i2c_adapter *adapter, int address, int kind)
+static int eeprom_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *new_client;
struct eeprom_data *data;
@@ -171,11 +171,10 @@ int eeprom_detect(struct i2c_adapter *adapter, int address, int kind)
| I2C_FUNC_SMBUS_BYTE))
goto exit;
- if (!(data = kmalloc(sizeof(struct eeprom_data), GFP_KERNEL))) {
+ if (!(data = kzalloc(sizeof(struct eeprom_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
- memset(data, 0, sizeof(struct eeprom_data));
new_client = &data->client;
memset(data->data, 0xff, EEPROM_SIZE);
diff --git a/drivers/i2c/chips/isp1301_omap.c b/drivers/i2c/chips/isp1301_omap.c
index 8ee56d4b389..eaa4742e04f 100644
--- a/drivers/i2c/chips/isp1301_omap.c
+++ b/drivers/i2c/chips/isp1301_omap.c
@@ -888,6 +888,7 @@ static int otg_remove(struct device *dev)
}
struct device_driver omap_otg_driver = {
+ .owner = THIS_MODULE,
.name = "omap_otg",
.bus = &platform_bus_type,
.probe = otg_probe,
diff --git a/drivers/i2c/chips/m41t00.c b/drivers/i2c/chips/m41t00.c
index 3f14528a52a..3df309ae44a 100644
--- a/drivers/i2c/chips/m41t00.c
+++ b/drivers/i2c/chips/m41t00.c
@@ -174,13 +174,11 @@ m41t00_probe(struct i2c_adapter *adap, int addr, int kind)
struct i2c_client *client;
int rc;
- client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
+ client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (!client)
return -ENOMEM;
- memset(client, 0, sizeof(struct i2c_client));
strncpy(client->name, M41T00_DRV_NAME, I2C_NAME_SIZE);
- client->flags = I2C_DF_NOTIFY;
client->addr = addr;
client->adapter = adap;
client->driver = &m41t00_driver;
diff --git a/drivers/i2c/chips/max6875.c b/drivers/i2c/chips/max6875.c
index 9e1aeb69abf..b376a006883 100644
--- a/drivers/i2c/chips/max6875.c
+++ b/drivers/i2c/chips/max6875.c
@@ -179,16 +179,14 @@ static int max6875_detect(struct i2c_adapter *adapter, int address, int kind)
if (address & 1)
return 0;
- if (!(data = kmalloc(sizeof(struct max6875_data), GFP_KERNEL)))
+ if (!(data = kzalloc(sizeof(struct max6875_data), GFP_KERNEL)))
return -ENOMEM;
- memset(data, 0, sizeof(struct max6875_data));
/* A fake client is created on the odd address */
- if (!(fake_client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL))) {
+ if (!(fake_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL))) {
err = -ENOMEM;
goto exit_kfree1;
}
- memset(fake_client, 0, sizeof(struct i2c_client));
/* Init real i2c_client */
real_client = &data->client;
diff --git a/drivers/i2c/chips/pca9539.c b/drivers/i2c/chips/pca9539.c
index 225577fdda4..59a93034622 100644
--- a/drivers/i2c/chips/pca9539.c
+++ b/drivers/i2c/chips/pca9539.c
@@ -122,11 +122,10 @@ static int pca9539_detect(struct i2c_adapter *adapter, int address, int kind)
/* OK. For now, we presume we have a valid client. We now create the
client structure, even though we cannot fill it completely yet. */
- if (!(data = kmalloc(sizeof(struct pca9539_data), GFP_KERNEL))) {
+ if (!(data = kzalloc(sizeof(struct pca9539_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
- memset(data, 0, sizeof(struct pca9539_data));
new_client = &data->client;
i2c_set_clientdata(new_client, data);
diff --git a/drivers/i2c/chips/pcf8574.c b/drivers/i2c/chips/pcf8574.c
index 6525743ff9f..c323c2de236 100644
--- a/drivers/i2c/chips/pcf8574.c
+++ b/drivers/i2c/chips/pcf8574.c
@@ -115,7 +115,7 @@ static int pcf8574_attach_adapter(struct i2c_adapter *adapter)
}
/* This function is called by i2c_probe */
-int pcf8574_detect(struct i2c_adapter *adapter, int address, int kind)
+static int pcf8574_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *new_client;
struct pcf8574_data *data;
@@ -127,11 +127,10 @@ int pcf8574_detect(struct i2c_adapter *adapter, int address, int kind)
/* OK. For now, we presume we have a valid client. We now create the
client structure, even though we cannot fill it completely yet. */
- if (!(data = kmalloc(sizeof(struct pcf8574_data), GFP_KERNEL))) {
+ if (!(data = kzalloc(sizeof(struct pcf8574_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
- memset(data, 0, sizeof(struct pcf8574_data));
new_client = &data->client;
i2c_set_clientdata(new_client, data);
diff --git a/drivers/i2c/chips/pcf8591.c b/drivers/i2c/chips/pcf8591.c
index 80f1df9a450..ce420a67560 100644
--- a/drivers/i2c/chips/pcf8591.c
+++ b/drivers/i2c/chips/pcf8591.c
@@ -166,7 +166,7 @@ static int pcf8591_attach_adapter(struct i2c_adapter *adapter)
}
/* This function is called by i2c_probe */
-int pcf8591_detect(struct i2c_adapter *adapter, int address, int kind)
+static int pcf8591_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *new_client;
struct pcf8591_data *data;
@@ -178,11 +178,10 @@ int pcf8591_detect(struct i2c_adapter *adapter, int address, int kind)
/* OK. For now, we presume we have a valid client. We now create the
client structure, even though we cannot fill it completely yet. */
- if (!(data = kmalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) {
+ if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
- memset(data, 0, sizeof(struct pcf8591_data));
new_client = &data->client;
i2c_set_clientdata(new_client, data);
diff --git a/drivers/i2c/chips/rtc8564.c b/drivers/i2c/chips/rtc8564.c
index 0b5385c892b..916cdc1af23 100644
--- a/drivers/i2c/chips/rtc8564.c
+++ b/drivers/i2c/chips/rtc8564.c
@@ -148,17 +148,16 @@ static int rtc8564_attach(struct i2c_adapter *adap, int addr, int kind)
{addr, I2C_M_RD, 2, data}
};
- d = kmalloc(sizeof(struct rtc8564_data), GFP_KERNEL);
+ d = kzalloc(sizeof(struct rtc8564_data), GFP_KERNEL);
if (!d) {
ret = -ENOMEM;
goto done;
}
- memset(d, 0, sizeof(struct rtc8564_data));
new_client = &d->client;
strlcpy(new_client->name, "RTC8564", I2C_NAME_SIZE);
i2c_set_clientdata(new_client, d);
- new_client->flags = I2C_CLIENT_ALLOW_USE | I2C_DF_NOTIFY;
+ new_client->flags = I2C_CLIENT_ALLOW_USE;
new_client->addr = addr;
new_client->adapter = adap;
new_client->driver = &rtc8564_driver;
diff --git a/drivers/i2c/chips/tps65010.c b/drivers/i2c/chips/tps65010.c
index 280e9638c0f..280dd7a45db 100644
--- a/drivers/i2c/chips/tps65010.c
+++ b/drivers/i2c/chips/tps65010.c
@@ -500,11 +500,10 @@ tps65010_probe(struct i2c_adapter *bus, int address, int kind)
return 0;
}
- tps = kmalloc(sizeof *tps, GFP_KERNEL);
+ tps = kzalloc(sizeof *tps, GFP_KERNEL);
if (!tps)
return 0;
- memset(tps, 0, sizeof *tps);
init_MUTEX(&tps->lock);
INIT_WORK(&tps->work, tps65010_work, tps);
tps->irq = -1;
diff --git a/drivers/i2c/chips/x1205.c b/drivers/i2c/chips/x1205.c
new file mode 100644
index 00000000000..7da366cdc18
--- /dev/null
+++ b/drivers/i2c/chips/x1205.c
@@ -0,0 +1,698 @@
+/*
+ * x1205.c - An i2c driver for the Xicor X1205 RTC
+ * Copyright 2004 Karen Spearel
+ * Copyright 2005 Alessandro Zummo
+ *
+ * please send all reports to:
+ * kas11 at tampabay dot rr dot com
+ * a dot zummo at towertech dot it
+ *
+ * based on the other drivers in this same directory.
+ *
+ * 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/x1205.h>
+
+#define DRV_VERSION "0.9.9"
+
+/* Addresses to scan: none. This chip is located at
+ * 0x6f and uses a two bytes register addressing.
+ * Two bytes need to be written to read a single register,
+ * while most other chips just require one and take the second
+ * one as the data to be written. To prevent corrupting
+ * unknown chips, the user must explicitely set the probe parameter.
+ */
+
+static unsigned short normal_i2c[] = { I2C_CLIENT_END };
+
+/* Insmod parameters */
+I2C_CLIENT_INSMOD;
+I2C_CLIENT_MODULE_PARM(hctosys,
+ "Set the system time from the hardware clock upon initialization");
+
+/* offsets into CCR area */
+
+#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
+
+#define X1205_REG_SR 0x3F /* status register */
+#define X1205_REG_Y2K 0x37
+#define X1205_REG_DW 0x36
+#define X1205_REG_YR 0x35
+#define X1205_REG_MO 0x34
+#define X1205_REG_DT 0x33
+#define X1205_REG_HR 0x32
+#define X1205_REG_MN 0x31
+#define X1205_REG_SC 0x30
+#define X1205_REG_DTR 0x13
+#define X1205_REG_ATR 0x12
+#define X1205_REG_INT 0x11
+#define X1205_REG_0 0x10
+#define X1205_REG_Y2K1 0x0F
+#define X1205_REG_DWA1 0x0E
+#define X1205_REG_YRA1 0x0D
+#define X1205_REG_MOA1 0x0C
+#define X1205_REG_DTA1 0x0B
+#define X1205_REG_HRA1 0x0A
+#define X1205_REG_MNA1 0x09
+#define X1205_REG_SCA1 0x08
+#define X1205_REG_Y2K0 0x07
+#define X1205_REG_DWA0 0x06
+#define X1205_REG_YRA0 0x05
+#define X1205_REG_MOA0 0x04
+#define X1205_REG_DTA0 0x03
+#define X1205_REG_HRA0 0x02
+#define X1205_REG_MNA0 0x01
+#define X1205_REG_SCA0 0x00
+
+#define X1205_CCR_BASE 0x30 /* Base address of CCR */
+#define X1205_ALM0_BASE 0x00 /* Base address of ALARM0 */
+
+#define X1205_SR_RTCF 0x01 /* Clock failure */
+#define X1205_SR_WEL 0x02 /* Write Enable Latch */
+#define X1205_SR_RWEL 0x04 /* Register Write Enable */
+
+#define X1205_DTR_DTR0 0x01
+#define X1205_DTR_DTR1 0x02
+#define X1205_DTR_DTR2 0x04
+
+#define X1205_HR_MIL 0x80 /* Set in ccr.hour for 24 hr mode */
+
+/* Prototypes */
+static int x1205_attach(struct i2c_adapter *adapter);
+static int x1205_detach(struct i2c_client *client);
+static int x1205_probe(struct i2c_adapter *adapter, int address, int kind);
+static int x1205_command(struct i2c_client *client, unsigned int cmd,
+ void *arg);
+
+static struct i2c_driver x1205_driver = {
+ .owner = THIS_MODULE,
+ .name = "x1205",
+ .flags = I2C_DF_NOTIFY,
+ .attach_adapter = &x1205_attach,
+ .detach_client = &x1205_detach,
+};
+
+struct x1205_data {
+ struct i2c_client client;
+ struct list_head list;
+ unsigned int epoch;
+};
+
+static const unsigned char days_in_mo[] =
+ { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+
+static LIST_HEAD(x1205_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 x1205_do_command(unsigned int cmd, void *arg)
+{
+ struct list_head *walk;
+ struct list_head *tmp;
+ struct x1205_data *data;
+
+ list_for_each_safe(walk, tmp, &x1205_clients) {
+ data = list_entry(walk, struct x1205_data, list);
+ return x1205_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 x1205_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 x1205 hardware, we use
+ * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
+ * Epoch is initialized as 2000. Time is set to UTC.
+ */
+static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm,
+ u8 reg_base)
+{
+ unsigned char dt_addr[2] = { 0, reg_base };
+ static unsigned char sr_addr[2] = { 0, X1205_REG_SR };
+
+ unsigned char buf[8], sr;
+
+ struct i2c_msg msgs[] = {
+ { client->addr, 0, 2, sr_addr }, /* setup read ptr */
+ { client->addr, I2C_M_RD, 1, &sr }, /* read status */
+ { client->addr, 0, 2, dt_addr }, /* setup read ptr */
+ { client->addr, I2C_M_RD, 8, buf }, /* read date */
+ };
+
+ struct x1205_data *data = i2c_get_clientdata(client);
+
+ /* read status register */
+ if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+ dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
+ return -EIO;
+ }
+
+ /* check for battery failure */
+ if (sr & X1205_SR_RTCF) {
+ dev_warn(&client->dev,
+ "Clock had a power failure, you must set the date.\n");
+ return -EINVAL;
+ }
+
+ /* read date registers */
+ if ((i2c_transfer(client->adapter, &msgs[2], 2)) != 2) {
+ dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
+ return -EIO;
+ }
+
+ dev_dbg(&client->dev,
+ "%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
+ "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
+ __FUNCTION__,
+ buf[0], buf[1], buf[2], buf[3],
+ buf[4], buf[5], buf[6], buf[7]);
+
+ tm->tm_sec = BCD2BIN(buf[CCR_SEC]);
+ tm->tm_min = BCD2BIN(buf[CCR_MIN]);
+ tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
+ tm->tm_mday = BCD2BIN(buf[CCR_MDAY]);
+ tm->tm_mon = BCD2BIN(buf[CCR_MONTH]);
+ data->epoch = BCD2BIN(buf[CCR_Y2K]) * 100;
+ tm->tm_year = BCD2BIN(buf[CCR_YEAR]) + data->epoch - 1900;
+ tm->tm_wday = buf[CCR_WDAY];
+
+ 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);
+
+ return 0;
+}
+
+static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
+ int datetoo, u8 reg_base)
+{
+ int i, err, xfer;
+
+ unsigned char buf[8];
+
+ static const unsigned char wel[3] = { 0, X1205_REG_SR,
+ X1205_SR_WEL };
+
+ static const unsigned char rwel[3] = { 0, X1205_REG_SR,
+ X1205_SR_WEL | X1205_SR_RWEL };
+
+ static const unsigned char diswe[3] = { 0, X1205_REG_SR, 0 };
+
+ struct x1205_data *data = i2c_get_clientdata(client);
+
+ /* check if all values in the tm struct are correct */
+ if ((err = x1205_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);
+
+ 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) | X1205_HR_MIL;
+
+ /* should we also set the date? */
+ if (datetoo) {
+ buf[CCR_MDAY] = BIN2BCD(tm->tm_mday);
+
+ /* month, 0 - 11 */
+ buf[CCR_MONTH] = BIN2BCD(tm->tm_mon);
+
+ /* year, since 1900 */
+ buf[CCR_YEAR] = BIN2BCD(tm->tm_year + 1900 - data->epoch);
+ buf[CCR_WDAY] = tm->tm_wday & 0x07;
+ buf[CCR_Y2K] = BIN2BCD(data->epoch / 100);
+ }
+
+ /* this sequence is required to unlock the chip */
+ xfer = i2c_master_send(client, wel, 3);
+ if (xfer != 3) {
+ dev_err(&client->dev, "%s: wel - %d\n", __FUNCTION__, xfer);
+ return -EIO;
+ }
+
+ xfer = i2c_master_send(client, rwel, 3);
+ if (xfer != 3) {
+ dev_err(&client->dev, "%s: rwel - %d\n", __FUNCTION__, xfer);
+ return -EIO;
+ }
+
+ /* write register's data */
+ for (i = 0; i < (datetoo ? 8 : 3); i++) {
+ unsigned char rdata[3] = { 0, reg_base + i, buf[i] };
+
+ xfer = i2c_master_send(client, rdata, 3);
+ if (xfer != 3) {
+ dev_err(&client->dev,
+ "%s: xfer=%d addr=%02x, data=%02x\n",
+ __FUNCTION__,
+ xfer, rdata[1], rdata[2]);
+ return -EIO;
+ }
+ };
+
+ /* disable further writes */
+ xfer = i2c_master_send(client, diswe, 3);
+ if (xfer != 3) {
+ dev_err(&client->dev, "%s: diswe - %d\n", __FUNCTION__, xfer);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int x1205_get_dtrim(struct i2c_client *client, int *trim)
+{
+ unsigned char dtr;
+ static unsigned char dtr_addr[2] = { 0, X1205_REG_DTR };
+
+ struct i2c_msg msgs[] = {
+ { client->addr, 0, 2, dtr_addr }, /* setup read ptr */
+ { client->addr, I2C_M_RD, 1, &dtr }, /* read dtr */
+ };
+
+ /* read dtr register */
+ if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+ dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
+ return -EIO;
+ }
+
+ dev_dbg(&client->dev, "%s: raw dtr=%x\n", __FUNCTION__, dtr);
+
+ *trim = 0;
+
+ if (dtr & X1205_DTR_DTR0)
+ *trim += 20;
+
+ if (dtr & X1205_DTR_DTR1)
+ *trim += 10;
+
+ if (dtr & X1205_DTR_DTR2)
+ *trim = -*trim;
+
+ return 0;
+}
+
+static int x1205_get_atrim(struct i2c_client *client, int *trim)
+{
+ s8 atr;
+ static unsigned char atr_addr[2] = { 0, X1205_REG_ATR };
+
+ struct i2c_msg msgs[] = {
+ { client->addr, 0, 2, atr_addr }, /* setup read ptr */
+ { client->addr, I2C_M_RD, 1, &atr }, /* read atr */
+ };
+
+ /* read atr register */
+ if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+ dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
+ return -EIO;
+ }
+
+ dev_dbg(&client->dev, "%s: raw atr=%x\n", __FUNCTION__, atr);
+
+ /* atr is a two's complement value on 6 bits,
+ * perform sign extension. The formula is
+ * Catr = (atr * 0.25pF) + 11.00pF.
+ */
+ if (atr & 0x20)
+ atr |= 0xC0;
+
+ dev_dbg(&client->dev, "%s: raw atr=%x (%d)\n", __FUNCTION__, atr, atr);
+
+ *trim = (atr * 250) + 11000;
+
+ dev_dbg(&client->dev, "%s: real=%d\n", __FUNCTION__, *trim);
+
+ return 0;
+}
+
+static int x1205_hctosys(struct i2c_client *client)
+{
+ int err;
+
+ struct rtc_time tm;
+ struct timespec tv;
+
+ err = x1205_command(client, X1205_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 x1205_limit
+{
+ unsigned char reg;
+ unsigned char mask;
+ unsigned char min;
+ unsigned char max;
+};
+
+static int x1205_validate_client(struct i2c_client *client)
+{
+ int i, xfer;
+
+ /* Probe array. We will read the register at the specified
+ * address and check if the given bits are zero.
+ */
+ static const unsigned char probe_zero_pattern[] = {
+ /* register, mask */
+ X1205_REG_SR, 0x18,
+ X1205_REG_DTR, 0xF8,
+ X1205_REG_ATR, 0xC0,
+ X1205_REG_INT, 0x18,
+ X1205_REG_0, 0xFF,
+ };
+
+ static const struct x1205_limit probe_limits_pattern[] = {
+ /* register, mask, min, max */
+ { X1205_REG_Y2K, 0xFF, 19, 20 },
+ { X1205_REG_DW, 0xFF, 0, 6 },
+ { X1205_REG_YR, 0xFF, 0, 99 },
+ { X1205_REG_MO, 0xFF, 0, 12 },
+ { X1205_REG_DT, 0xFF, 0, 31 },
+ { X1205_REG_HR, 0x7F, 0, 23 },
+ { X1205_REG_MN, 0xFF, 0, 59 },
+ { X1205_REG_SC, 0xFF, 0, 59 },
+ { X1205_REG_Y2K1, 0xFF, 19, 20 },
+ { X1205_REG_Y2K0, 0xFF, 19, 20 },
+ };
+
+ /* check that registers have bits a 0 where expected */
+ for (i = 0; i < ARRAY_SIZE(probe_zero_pattern); i += 2) {
+ unsigned char buf;
+
+ unsigned char addr[2] = { 0, probe_zero_pattern[i] };
+
+ 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__, addr[1]);
+
+ return -EIO;
+ }
+
+ if ((buf & probe_zero_pattern[i+1]) != 0) {
+ dev_err(&client->adapter->dev,
+ "%s: register=%02x, zero pattern=%d, value=%x\n",
+ __FUNCTION__, addr[1], i, buf);
+
+ return -ENODEV;
+ }
+ }
+
+ /* check limits (only registers with bcd values) */
+ for (i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) {
+ unsigned char reg, value;
+
+ unsigned char addr[2] = { 0, probe_limits_pattern[i].reg };
+
+ struct i2c_msg msgs[2] = {
+ { client->addr, 0, 2, addr },
+ { client->addr, I2C_M_RD, 1, &reg },
+ };
+
+ xfer = i2c_transfer(client->adapter, msgs, 2);
+
+ if (xfer != 2) {
+ dev_err(&client->adapter->dev,
+ "%s: could not read register %x\n",
+ __FUNCTION__, addr[1]);
+
+ return -EIO;
+ }
+
+ value = BCD2BIN(reg & 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__, addr[1], i, value);
+
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+static int x1205_attach(struct i2c_adapter *adapter)
+{
+ dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
+
+ return i2c_probe(adapter, &addr_data, x1205_probe);
+}
+
+int x1205_direct_attach(int adapter_id,
+ struct i2c_client_address_data *address_data)
+{
+ int err;
+ struct i2c_adapter *adapter = i2c_get_adapter(adapter_id);
+
+ if (adapter) {
+ err = i2c_probe(adapter,
+ address_data, x1205_probe);
+
+ i2c_put_adapter(adapter);
+
+ return err;
+ }
+
+ return -ENODEV;
+}
+
+static int x1205_probe(struct i2c_adapter *adapter, int address, int kind)
+{
+ struct i2c_client *client;
+ struct x1205_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 x1205_data), GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ /* Initialize our structures */
+ data->epoch = 2000;
+
+ client = &data->client;
+ client->addr = address;
+ client->driver = &x1205_driver;
+ client->adapter = adapter;
+
+ strlcpy(client->name, "x1205", I2C_NAME_SIZE);
+
+ i2c_set_clientdata(client, data);
+
+ /* Verify the chip is really an X1205 */
+ if (kind < 0) {
+ if (x1205_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, &x1205_clients);
+
+ dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
+
+ /* If requested, set the system time */
+ if (hctosys)
+ x1205_hctosys(client);
+
+ return 0;
+
+exit_kfree:
+ kfree(data);
+
+exit:
+ return err;
+}
+
+static int x1205_detach(struct i2c_client *client)
+{
+ int err;
+ struct x1205_data *data = i2c_get_clientdata(client);
+
+ dev_dbg(&client->dev, "%s\n", __FUNCTION__);
+
+ if ((err = i2c_detach_client(client)))
+ return err;
+
+ list_del(&data->list);
+
+ kfree(data);
+
+ return 0;
+}
+
+static int x1205_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 X1205_CMD_GETDATETIME:
+ return x1205_get_datetime(client, param, X1205_CCR_BASE);
+
+ case X1205_CMD_SETTIME:
+ return x1205_set_datetime(client, param, 0,
+ X1205_CCR_BASE);
+
+ case X1205_CMD_SETDATETIME:
+ return x1205_set_datetime(client, param, 1,
+ X1205_CCR_BASE);
+
+ case X1205_CMD_GETALARM:
+ return x1205_get_datetime(client, param, X1205_ALM0_BASE);
+
+ case X1205_CMD_SETALARM:
+ return x1205_set_datetime(client, param, 1,
+ X1205_ALM0_BASE);
+
+ case X1205_CMD_GETDTRIM:
+ return x1205_get_dtrim(client, param);
+
+ case X1205_CMD_GETATRIM:
+ return x1205_get_atrim(client, param);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int __init x1205_init(void)
+{
+ return i2c_add_driver(&x1205_driver);
+}
+
+static void __exit x1205_exit(void)
+{
+ i2c_del_driver(&x1205_driver);
+}
+
+MODULE_AUTHOR(
+ "Karen Spearel <kas11@tampabay.rr.com>, "
+ "Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("Xicor X1205 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+EXPORT_SYMBOL_GPL(x1205_do_command);
+EXPORT_SYMBOL_GPL(x1205_direct_attach);
+
+module_init(x1205_init);
+module_exit(x1205_exit);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-22 10:15:34 +0000