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Commit 6fc7f10c authored by Alessandro Zummo's avatar Alessandro Zummo Committed by Linus Torvalds
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[PATCH] RTC subsystem: I2C cleanup 

This patch, completely optional, removes from drivers/i2c/chips all the
drivers that are implemented in the new RTC subsystem.

It should be noted that none of the current driver is actually integrated,
i.e.  usable without further patches.
Signed-off-by: default avatarAlessandro Zummo <a.zummo@towertech.it>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 0c86edc0
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Showing with 0 additions and 1212 deletions
drivers/i2c/chips/Kconfig
View file @ 6fc7f10c
......@@ -65,15 +65,6 @@ config SENSORS_PCF8591
This driver can also be built as a module. If so, the module
will be called pcf8591.
config SENSORS_RTC8564
tristate "Epson 8564 RTC chip"
depends on I2C && EXPERIMENTAL
help
If you say yes here you get support for the Epson 8564 RTC chip.
This driver can also be built as a module. If so, the module
will be called i2c-rtc8564.
config ISP1301_OMAP
tristate "Philips ISP1301 with OMAP OTG"
depends on I2C && ARCH_OMAP_OTG
......@@ -126,13 +117,4 @@ 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
drivers/i2c/chips/Makefile
View file @ 6fc7f10c
......@@ -10,10 +10,8 @@ obj-$(CONFIG_SENSORS_M41T00) += m41t00.o
obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o
obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o
obj-$(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
......
drivers/i2c/chips/rtc8564.c deleted 100644 → 0
View file @ 0c86edc0
/*
* linux/drivers/i2c/chips/rtc8564.c
*
* Copyright (C) 2002-2004 Stefan Eletzhofer
*
* based on linux/drivers/acron/char/pcf8583.c
* Copyright (C) 2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Driver for system3's EPSON RTC 8564 chip
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bcd.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/rtc.h> /* get the user-level API */
#include <linux/init.h>
#include "rtc8564.h"
#ifdef DEBUG
# define _DBG(x, fmt, args...) do{ if (debug>=x) printk(KERN_DEBUG"%s: " fmt "\n", __FUNCTION__, ##args); } while(0);
#else
# define _DBG(x, fmt, args...) do { } while(0);
#endif
#define _DBGRTCTM(x, rtctm) if (debug>=x) printk("%s: secs=%d, mins=%d, hours=%d, mday=%d, " \
"mon=%d, year=%d, wday=%d VL=%d\n", __FUNCTION__, \
(rtctm).secs, (rtctm).mins, (rtctm).hours, (rtctm).mday, \
(rtctm).mon, (rtctm).year, (rtctm).wday, (rtctm).vl);
struct rtc8564_data {
struct i2c_client client;
u16 ctrl;
};
static inline u8 _rtc8564_ctrl1(struct i2c_client *client)
{
struct rtc8564_data *data = i2c_get_clientdata(client);
return data->ctrl & 0xff;
}
static inline u8 _rtc8564_ctrl2(struct i2c_client *client)
{
struct rtc8564_data *data = i2c_get_clientdata(client);
return (data->ctrl & 0xff00) >> 8;
}
#define CTRL1(c) _rtc8564_ctrl1(c)
#define CTRL2(c) _rtc8564_ctrl2(c)
static int debug;
module_param(debug, int, S_IRUGO | S_IWUSR);
static struct i2c_driver rtc8564_driver;
static unsigned short ignore[] = { I2C_CLIENT_END };
static unsigned short normal_addr[] = { 0x51, I2C_CLIENT_END };
static struct i2c_client_address_data addr_data = {
.normal_i2c = normal_addr,
.probe = ignore,
.ignore = ignore,
};
static int rtc8564_read_mem(struct i2c_client *client, struct mem *mem);
static int rtc8564_write_mem(struct i2c_client *client, struct mem *mem);
static int rtc8564_read(struct i2c_client *client, unsigned char adr,
unsigned char *buf, unsigned char len)
{
int ret = -EIO;
unsigned char addr[1] = { adr };
struct i2c_msg msgs[2] = {
{client->addr, 0, 1, addr},
{client->addr, I2C_M_RD, len, buf}
};
_DBG(1, "client=%p, adr=%d, buf=%p, len=%d", client, adr, buf, len);
if (!buf) {
ret = -EINVAL;
goto done;
}
ret = i2c_transfer(client->adapter, msgs, 2);
if (ret == 2) {
ret = 0;
}
done:
return ret;
}
static int rtc8564_write(struct i2c_client *client, unsigned char adr,
unsigned char *data, unsigned char len)
{
int ret = 0;
unsigned char _data[16];
struct i2c_msg wr;
int i;
if (!data || len > 15) {
ret = -EINVAL;
goto done;
}
_DBG(1, "client=%p, adr=%d, buf=%p, len=%d", client, adr, data, len);
_data[0] = adr;
for (i = 0; i < len; i++) {
_data[i + 1] = data[i];
_DBG(5, "data[%d] = 0x%02x (%d)", i, data[i], data[i]);
}
wr.addr = client->addr;
wr.flags = 0;
wr.len = len + 1;
wr.buf = _data;
ret = i2c_transfer(client->adapter, &wr, 1);
if (ret == 1) {
ret = 0;
}
done:
return ret;
}
static int rtc8564_attach(struct i2c_adapter *adap, int addr, int kind)
{
int ret;
struct i2c_client *new_client;
struct rtc8564_data *d;
unsigned char data[10];
unsigned char ad[1] = { 0 };
struct i2c_msg ctrl_wr[1] = {
{addr, 0, 2, data}
};
struct i2c_msg ctrl_rd[2] = {
{addr, 0, 1, ad},
{addr, I2C_M_RD, 2, data}
};
d = kzalloc(sizeof(struct rtc8564_data), GFP_KERNEL);
if (!d) {
ret = -ENOMEM;
goto done;
}
new_client = &d->client;
strlcpy(new_client->name, "RTC8564", I2C_NAME_SIZE);
i2c_set_clientdata(new_client, d);
new_client->addr = addr;
new_client->adapter = adap;
new_client->driver = &rtc8564_driver;
_DBG(1, "client=%p", new_client);
/* init ctrl1 reg */
data[0] = 0;
data[1] = 0;
ret = i2c_transfer(new_client->adapter, ctrl_wr, 1);
if (ret != 1) {
printk(KERN_INFO "rtc8564: cant init ctrl1\n");
ret = -ENODEV;
goto done;
}
/* read back ctrl1 and ctrl2 */
ret = i2c_transfer(new_client->adapter, ctrl_rd, 2);
if (ret != 2) {
printk(KERN_INFO "rtc8564: cant read ctrl\n");
ret = -ENODEV;
goto done;
}
d->ctrl = data[0] | (data[1] << 8);
_DBG(1, "RTC8564_REG_CTRL1=%02x, RTC8564_REG_CTRL2=%02x",
data[0], data[1]);
ret = i2c_attach_client(new_client);
done:
if (ret) {
kfree(d);
}
return ret;
}
static int rtc8564_probe(struct i2c_adapter *adap)
{
return i2c_probe(adap, &addr_data, rtc8564_attach);
}
static int rtc8564_detach(struct i2c_client *client)
{
i2c_detach_client(client);
kfree(i2c_get_clientdata(client));
return 0;
}
static int rtc8564_get_datetime(struct i2c_client *client, struct rtc_tm *dt)
{
int ret = -EIO;
unsigned char buf[15];
_DBG(1, "client=%p, dt=%p", client, dt);
if (!dt)
return -EINVAL;
memset(buf, 0, sizeof(buf));
ret = rtc8564_read(client, 0, buf, 15);
if (ret)
return ret;
/* century stored in minute alarm reg */
dt->year = BCD2BIN(buf[RTC8564_REG_YEAR]);
dt->year += 100 * BCD2BIN(buf[RTC8564_REG_AL_MIN] & 0x3f);
dt->mday = BCD2BIN(buf[RTC8564_REG_DAY] & 0x3f);
dt->wday = BCD2BIN(buf[RTC8564_REG_WDAY] & 7);
dt->mon = BCD2BIN(buf[RTC8564_REG_MON_CENT] & 0x1f);
dt->secs = BCD2BIN(buf[RTC8564_REG_SEC] & 0x7f);
dt->vl = (buf[RTC8564_REG_SEC] & 0x80) == 0x80;
dt->mins = BCD2BIN(buf[RTC8564_REG_MIN] & 0x7f);
dt->hours = BCD2BIN(buf[RTC8564_REG_HR] & 0x3f);
_DBGRTCTM(2, *dt);
return 0;
}
static int
rtc8564_set_datetime(struct i2c_client *client, struct rtc_tm *dt, int datetoo)
{
int ret, len = 5;
unsigned char buf[15];
_DBG(1, "client=%p, dt=%p", client, dt);
if (!dt)
return -EINVAL;
_DBGRTCTM(2, *dt);
buf[RTC8564_REG_CTRL1] = CTRL1(client) | RTC8564_CTRL1_STOP;
buf[RTC8564_REG_CTRL2] = CTRL2(client);
buf[RTC8564_REG_SEC] = BIN2BCD(dt->secs);
buf[RTC8564_REG_MIN] = BIN2BCD(dt->mins);
buf[RTC8564_REG_HR] = BIN2BCD(dt->hours);
if (datetoo) {
len += 5;
buf[RTC8564_REG_DAY] = BIN2BCD(dt->mday);
buf[RTC8564_REG_WDAY] = BIN2BCD(dt->wday);
buf[RTC8564_REG_MON_CENT] = BIN2BCD(dt->mon) & 0x1f;
/* century stored in minute alarm reg */
buf[RTC8564_REG_YEAR] = BIN2BCD(dt->year % 100);
buf[RTC8564_REG_AL_MIN] = BIN2BCD(dt->year / 100);
}
ret = rtc8564_write(client, 0, buf, len);
if (ret) {
_DBG(1, "error writing data! %d", ret);
}
buf[RTC8564_REG_CTRL1] = CTRL1(client);
ret = rtc8564_write(client, 0, buf, 1);
if (ret) {
_DBG(1, "error writing data! %d", ret);
}
return ret;
}
static int rtc8564_get_ctrl(struct i2c_client *client, unsigned int *ctrl)
{
struct rtc8564_data *data = i2c_get_clientdata(client);
if (!ctrl)
return -1;
*ctrl = data->ctrl;
return 0;
}
static int rtc8564_set_ctrl(struct i2c_client *client, unsigned int *ctrl)
{
struct rtc8564_data *data = i2c_get_clientdata(client);
unsigned char buf[2];
if (!ctrl)
return -1;
buf[0] = *ctrl & 0xff;
buf[1] = (*ctrl & 0xff00) >> 8;
data->ctrl = *ctrl;
return rtc8564_write(client, 0, buf, 2);
}
static int rtc8564_read_mem(struct i2c_client *client, struct mem *mem)
{
if (!mem)
return -EINVAL;
return rtc8564_read(client, mem->loc, mem->data, mem->nr);
}
static int rtc8564_write_mem(struct i2c_client *client, struct mem *mem)
{
if (!mem)
return -EINVAL;
return rtc8564_write(client, mem->loc, mem->data, mem->nr);
}
static int
rtc8564_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
_DBG(1, "cmd=%d", cmd);
switch (cmd) {
case RTC_GETDATETIME:
return rtc8564_get_datetime(client, arg);
case RTC_SETTIME:
return rtc8564_set_datetime(client, arg, 0);
case RTC_SETDATETIME:
return rtc8564_set_datetime(client, arg, 1);
case RTC_GETCTRL:
return rtc8564_get_ctrl(client, arg);
case RTC_SETCTRL:
return rtc8564_set_ctrl(client, arg);
case MEM_READ:
return rtc8564_read_mem(client, arg);
case MEM_WRITE:
return rtc8564_write_mem(client, arg);
default:
return -EINVAL;
}
}
static struct i2c_driver rtc8564_driver = {
.driver = {
.name = "RTC8564",
},
.id = I2C_DRIVERID_RTC8564,
.attach_adapter = rtc8564_probe,
.detach_client = rtc8564_detach,
.command = rtc8564_command
};
static __init int rtc8564_init(void)
{
return i2c_add_driver(&rtc8564_driver);
}
static __exit void rtc8564_exit(void)
{
i2c_del_driver(&rtc8564_driver);
}
MODULE_AUTHOR("Stefan Eletzhofer <Stefan.Eletzhofer@eletztrick.de>");
MODULE_DESCRIPTION("EPSON RTC8564 Driver");
MODULE_LICENSE("GPL");
module_init(rtc8564_init);
module_exit(rtc8564_exit);
drivers/i2c/chips/rtc8564.h deleted 100644 → 0
View file @ 0c86edc0
/*
* linux/drivers/i2c/chips/rtc8564.h
*
* Copyright (C) 2002-2004 Stefan Eletzhofer
*
* based on linux/drivers/acron/char/pcf8583.h
* Copyright (C) 2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
struct rtc_tm {
unsigned char secs;
unsigned char mins;
unsigned char hours;
unsigned char mday;
unsigned char mon;
unsigned short year; /* xxxx 4 digits :) */
unsigned char wday;
unsigned char vl;
};
struct mem {
unsigned int loc;
unsigned int nr;
unsigned char *data;
};
#define RTC_GETDATETIME 0
#define RTC_SETTIME 1
#define RTC_SETDATETIME 2
#define RTC_GETCTRL 3
#define RTC_SETCTRL 4
#define MEM_READ 5
#define MEM_WRITE 6
#define RTC8564_REG_CTRL1 0x0 /* T 0 S 0 | T 0 0 0 */
#define RTC8564_REG_CTRL2 0x1 /* 0 0 0 TI/TP | AF TF AIE TIE */
#define RTC8564_REG_SEC 0x2 /* VL 4 2 1 | 8 4 2 1 */
#define RTC8564_REG_MIN 0x3 /* x 4 2 1 | 8 4 2 1 */
#define RTC8564_REG_HR 0x4 /* x x 2 1 | 8 4 2 1 */
#define RTC8564_REG_DAY 0x5 /* x x 2 1 | 8 4 2 1 */
#define RTC8564_REG_WDAY 0x6 /* x x x x | x 4 2 1 */
#define RTC8564_REG_MON_CENT 0x7 /* C x x 1 | 8 4 2 1 */
#define RTC8564_REG_YEAR 0x8 /* 8 4 2 1 | 8 4 2 1 */
#define RTC8564_REG_AL_MIN 0x9 /* AE 4 2 1 | 8 4 2 1 */
#define RTC8564_REG_AL_HR 0xa /* AE 4 2 1 | 8 4 2 1 */
#define RTC8564_REG_AL_DAY 0xb /* AE x 2 1 | 8 4 2 1 */
#define RTC8564_REG_AL_WDAY 0xc /* AE x x x | x 4 2 1 */
#define RTC8564_REG_CLKOUT 0xd /* FE x x x | x x FD1 FD0 */
#define RTC8564_REG_TCTL 0xe /* TE x x x | x x FD1 FD0 */
#define RTC8564_REG_TIMER 0xf /* 8 bit binary */
/* Control reg */
#define RTC8564_CTRL1_TEST1 (1<<3)
#define RTC8564_CTRL1_STOP (1<<5)
#define RTC8564_CTRL1_TEST2 (1<<7)
#define RTC8564_CTRL2_TIE (1<<0)
#define RTC8564_CTRL2_AIE (1<<1)
#define RTC8564_CTRL2_TF (1<<2)
#define RTC8564_CTRL2_AF (1<<3)
#define RTC8564_CTRL2_TI_TP (1<<4)
/* CLKOUT frequencies */
#define RTC8564_FD_32768HZ (0x0)
#define RTC8564_FD_1024HZ (0x1)
#define RTC8564_FD_32 (0x2)
#define RTC8564_FD_1HZ (0x3)
/* Timer CTRL */
#define RTC8564_TD_4096HZ (0x0)
#define RTC8564_TD_64HZ (0x1)
#define RTC8564_TD_1HZ (0x2)
#define RTC8564_TD_1_60HZ (0x3)
#define I2C_DRIVERID_RTC8564 0xf000
drivers/i2c/chips/x1205.c deleted 100644 → 0
View file @ 0c86edc0
/*
* 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 = {
.driver = {
.name = "x1205",
},
.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);
include/linux/x1205.h deleted 100644 → 0
View file @ 0c86edc0
/*
* 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__ */
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