mirror of
https://github.com/adulau/aha.git
synced 2024-12-29 12:16:20 +00:00
[PATCH] i2c: New Xicor X1205 RTC driver
New driver for the Xicor X1205 RTC chip. Signed-off-by: Alessandro Zummo <alessandro.zummo@towertech.it> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alessandro Zummo
Greg Kroah-Hartman
parent
ddec748f32
commit
4d4e5ce864
5 changed files with 777 additions and 0 deletions
38
Documentation/i2c/chips/x1205
Normal file
38
Documentation/i2c/chips/x1205
Normal file
|
|
@ -0,0 +1,38 @@
|
||||||
|
Kernel driver x1205
|
||||||
|
===================
|
||||||
|
|
||||||
|
Supported chips:
|
||||||
|
* Xicor X1205 RTC
|
||||||
|
Prefix: 'x1205'
|
||||||
|
Addresses scanned: none
|
||||||
|
Datasheet: http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html
|
||||||
|
|
||||||
|
Authors:
|
||||||
|
Karen Spearel <kas11@tampabay.rr.com>,
|
||||||
|
Alessandro Zummo <a.zummo@towertech.it>
|
||||||
|
|
||||||
|
Description
|
||||||
|
-----------
|
||||||
|
|
||||||
|
This module aims to provide complete access to the Xicor X1205 RTC.
|
||||||
|
Recently Xicor has merged with Intersil, but the chip is
|
||||||
|
still sold under the Xicor brand.
|
||||||
|
|
||||||
|
This chip is located at address 0x6f and uses a 2-byte 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.
|
||||||
|
|
||||||
|
example:
|
||||||
|
|
||||||
|
modprobe x1205 probe=0,0x6f
|
||||||
|
|
||||||
|
The module supports one more option, hctosys, which is used to set the
|
||||||
|
software clock from the x1205. On systems where the x1205 is the
|
||||||
|
only hardware rtc, this parameter could be used to achieve a correct
|
||||||
|
date/time earlier in the system boot sequence.
|
||||||
|
|
||||||
|
example:
|
||||||
|
|
||||||
|
modprobe x1205 probe=0,0x6f hctosys=1
|
||||||
|
|
@ -126,4 +126,13 @@ config SENSORS_MAX6875
|
||||||
This driver can also be built as a module. If so, the module
|
This driver can also be built as a module. If so, the module
|
||||||
will be called max6875.
|
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
|
endmenu
|
||||||
|
|
|
||||||
|
|
@ -13,6 +13,7 @@ obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
|
||||||
obj-$(CONFIG_SENSORS_RTC8564) += rtc8564.o
|
obj-$(CONFIG_SENSORS_RTC8564) += rtc8564.o
|
||||||
obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o
|
obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o
|
||||||
obj-$(CONFIG_TPS65010) += tps65010.o
|
obj-$(CONFIG_TPS65010) += tps65010.o
|
||||||
|
obj-$(CONFIG_RTC_X1205_I2C) += x1205.o
|
||||||
|
|
||||||
ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)
|
ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)
|
||||||
EXTRA_CFLAGS += -DDEBUG
|
EXTRA_CFLAGS += -DDEBUG
|
||||||
|
|
|
||||||
698
drivers/i2c/chips/x1205.c
Normal file
698
drivers/i2c/chips/x1205.c
Normal file
|
|
@ -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, ® },
|
||||||
|
};
|
||||||
|
|
||||||
|
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);
|
||||||
31
include/linux/x1205.h
Normal file
31
include/linux/x1205.h
Normal file
|
|
@ -0,0 +1,31 @@
|
||||||
|
/*
|
||||||
|
* x1205.h - defines for drivers/i2c/chips/x1205.c
|
||||||
|
* Copyright 2004 Karen Spearel
|
||||||
|
* Copyright 2005 Alessandro Zummo
|
||||||
|
*
|
||||||
|
* 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_X1205_H__
|
||||||
|
#define __LINUX_X1205_H__
|
||||||
|
|
||||||
|
/* commands */
|
||||||
|
|
||||||
|
#define X1205_CMD_GETDATETIME 0
|
||||||
|
#define X1205_CMD_SETTIME 1
|
||||||
|
#define X1205_CMD_SETDATETIME 2
|
||||||
|
#define X1205_CMD_GETALARM 3
|
||||||
|
#define X1205_CMD_SETALARM 4
|
||||||
|
#define X1205_CMD_GETDTRIM 5
|
||||||
|
#define X1205_CMD_SETDTRIM 6
|
||||||
|
#define X1205_CMD_GETATRIM 7
|
||||||
|
#define X1205_CMD_SETATRIM 8
|
||||||
|
|
||||||
|
extern int x1205_do_command(unsigned int cmd, void *arg);
|
||||||
|
extern int x1205_direct_attach(int adapter_id,
|
||||||
|
struct i2c_client_address_data *address_data);
|
||||||
|
|
||||||
|
#endif /* __LINUX_X1205_H__ */
|
||||||
Loading…
Reference in a new issue