Revision a3f9bcab509a4bf003942e7e2048904cfe7cb5c5 authored by Rahul Sharma on 20 November 2012, 11:28:26 UTC, committed by Inki Dae on 05 December 2012, 05:39:21 UTC
This patch is to preserve the display mode header during the mode adjustment. Display mode header is overwritten with the adjusted mode header which is throwing the stack dump. Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
1 parent 3dc5fa9
rtc-rv3029c2.c
/*
* Micro Crystal RV-3029C2 rtc class driver
*
* Author: Gregory Hermant <gregory.hermant@calao-systems.com>
*
* based on previously existing rtc class drivers
*
* 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.
*
* NOTE: Currently this driver only supports the bare minimum for read
* and write the RTC and alarms. The extra features provided by this chip
* (trickle charger, eeprom, T° compensation) are unavailable.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
/* Register map */
/* control section */
#define RV3029C2_ONOFF_CTRL 0x00
#define RV3029C2_IRQ_CTRL 0x01
#define RV3029C2_IRQ_CTRL_AIE (1 << 0)
#define RV3029C2_IRQ_FLAGS 0x02
#define RV3029C2_IRQ_FLAGS_AF (1 << 0)
#define RV3029C2_STATUS 0x03
#define RV3029C2_STATUS_VLOW1 (1 << 2)
#define RV3029C2_STATUS_VLOW2 (1 << 3)
#define RV3029C2_STATUS_SR (1 << 4)
#define RV3029C2_STATUS_PON (1 << 5)
#define RV3029C2_STATUS_EEBUSY (1 << 7)
#define RV3029C2_RST_CTRL 0x04
#define RV3029C2_CONTROL_SECTION_LEN 0x05
/* watch section */
#define RV3029C2_W_SEC 0x08
#define RV3029C2_W_MINUTES 0x09
#define RV3029C2_W_HOURS 0x0A
#define RV3029C2_REG_HR_12_24 (1<<6) /* 24h/12h mode */
#define RV3029C2_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
#define RV3029C2_W_DATE 0x0B
#define RV3029C2_W_DAYS 0x0C
#define RV3029C2_W_MONTHS 0x0D
#define RV3029C2_W_YEARS 0x0E
#define RV3029C2_WATCH_SECTION_LEN 0x07
/* alarm section */
#define RV3029C2_A_SC 0x10
#define RV3029C2_A_MN 0x11
#define RV3029C2_A_HR 0x12
#define RV3029C2_A_DT 0x13
#define RV3029C2_A_DW 0x14
#define RV3029C2_A_MO 0x15
#define RV3029C2_A_YR 0x16
#define RV3029C2_ALARM_SECTION_LEN 0x07
/* timer section */
#define RV3029C2_TIMER_LOW 0x18
#define RV3029C2_TIMER_HIGH 0x19
/* temperature section */
#define RV3029C2_TEMP_PAGE 0x20
/* eeprom data section */
#define RV3029C2_E2P_EEDATA1 0x28
#define RV3029C2_E2P_EEDATA2 0x29
/* eeprom control section */
#define RV3029C2_CONTROL_E2P_EECTRL 0x30
#define RV3029C2_TRICKLE_1K (1<<0) /* 1K resistance */
#define RV3029C2_TRICKLE_5K (1<<1) /* 5K resistance */
#define RV3029C2_TRICKLE_20K (1<<2) /* 20K resistance */
#define RV3029C2_TRICKLE_80K (1<<3) /* 80K resistance */
#define RV3029C2_CONTROL_E2P_XTALOFFSET 0x31
#define RV3029C2_CONTROL_E2P_QCOEF 0x32
#define RV3029C2_CONTROL_E2P_TURNOVER 0x33
/* user ram section */
#define RV3029C2_USR1_RAM_PAGE 0x38
#define RV3029C2_USR1_SECTION_LEN 0x04
#define RV3029C2_USR2_RAM_PAGE 0x3C
#define RV3029C2_USR2_SECTION_LEN 0x04
static int
rv3029c2_i2c_read_regs(struct i2c_client *client, u8 reg, u8 *buf,
unsigned len)
{
int ret;
if ((reg > RV3029C2_USR1_RAM_PAGE + 7) ||
(reg + len > RV3029C2_USR1_RAM_PAGE + 8))
return -EINVAL;
ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);
if (ret < 0)
return ret;
if (ret < len)
return -EIO;
return 0;
}
static int
rv3029c2_i2c_write_regs(struct i2c_client *client, u8 reg, u8 const buf[],
unsigned len)
{
if ((reg > RV3029C2_USR1_RAM_PAGE + 7) ||
(reg + len > RV3029C2_USR1_RAM_PAGE + 8))
return -EINVAL;
return i2c_smbus_write_i2c_block_data(client, reg, len, buf);
}
static int
rv3029c2_i2c_get_sr(struct i2c_client *client, u8 *buf)
{
int ret = rv3029c2_i2c_read_regs(client, RV3029C2_STATUS, buf, 1);
if (ret < 0)
return -EIO;
dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
return 0;
}
static int
rv3029c2_i2c_set_sr(struct i2c_client *client, u8 val)
{
u8 buf[1];
int sr;
buf[0] = val;
sr = rv3029c2_i2c_write_regs(client, RV3029C2_STATUS, buf, 1);
dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
if (sr < 0)
return -EIO;
return 0;
}
static int
rv3029c2_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
{
u8 buf[1];
int ret;
u8 regs[RV3029C2_WATCH_SECTION_LEN] = { 0, };
ret = rv3029c2_i2c_get_sr(client, buf);
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
return -EIO;
}
ret = rv3029c2_i2c_read_regs(client, RV3029C2_W_SEC , regs,
RV3029C2_WATCH_SECTION_LEN);
if (ret < 0) {
dev_err(&client->dev, "%s: reading RTC section failed\n",
__func__);
return ret;
}
tm->tm_sec = bcd2bin(regs[RV3029C2_W_SEC-RV3029C2_W_SEC]);
tm->tm_min = bcd2bin(regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC]);
/* HR field has a more complex interpretation */
{
const u8 _hr = regs[RV3029C2_W_HOURS-RV3029C2_W_SEC];
if (_hr & RV3029C2_REG_HR_12_24) {
/* 12h format */
tm->tm_hour = bcd2bin(_hr & 0x1f);
if (_hr & RV3029C2_REG_HR_PM) /* PM flag set */
tm->tm_hour += 12;
} else /* 24h format */
tm->tm_hour = bcd2bin(_hr & 0x3f);
}
tm->tm_mday = bcd2bin(regs[RV3029C2_W_DATE-RV3029C2_W_SEC]);
tm->tm_mon = bcd2bin(regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC]) - 1;
tm->tm_year = bcd2bin(regs[RV3029C2_W_YEARS-RV3029C2_W_SEC]) + 100;
tm->tm_wday = bcd2bin(regs[RV3029C2_W_DAYS-RV3029C2_W_SEC]) - 1;
return 0;
}
static int rv3029c2_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
return rv3029c2_i2c_read_time(to_i2c_client(dev), tm);
}
static int
rv3029c2_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
{
struct rtc_time *const tm = &alarm->time;
int ret;
u8 regs[8];
ret = rv3029c2_i2c_get_sr(client, regs);
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
return -EIO;
}
ret = rv3029c2_i2c_read_regs(client, RV3029C2_A_SC, regs,
RV3029C2_ALARM_SECTION_LEN);
if (ret < 0) {
dev_err(&client->dev, "%s: reading alarm section failed\n",
__func__);
return ret;
}
tm->tm_sec = bcd2bin(regs[RV3029C2_A_SC-RV3029C2_A_SC] & 0x7f);
tm->tm_min = bcd2bin(regs[RV3029C2_A_MN-RV3029C2_A_SC] & 0x7f);
tm->tm_hour = bcd2bin(regs[RV3029C2_A_HR-RV3029C2_A_SC] & 0x3f);
tm->tm_mday = bcd2bin(regs[RV3029C2_A_DT-RV3029C2_A_SC] & 0x3f);
tm->tm_mon = bcd2bin(regs[RV3029C2_A_MO-RV3029C2_A_SC] & 0x1f) - 1;
tm->tm_year = bcd2bin(regs[RV3029C2_A_YR-RV3029C2_A_SC] & 0x7f) + 100;
tm->tm_wday = bcd2bin(regs[RV3029C2_A_DW-RV3029C2_A_SC] & 0x07) - 1;
return 0;
}
static int
rv3029c2_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
return rv3029c2_i2c_read_alarm(to_i2c_client(dev), alarm);
}
static int rv3029c2_rtc_i2c_alarm_set_irq(struct i2c_client *client,
int enable)
{
int ret;
u8 buf[1];
/* enable AIE irq */
ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_CTRL, buf, 1);
if (ret < 0) {
dev_err(&client->dev, "can't read INT reg\n");
return ret;
}
if (enable)
buf[0] |= RV3029C2_IRQ_CTRL_AIE;
else
buf[0] &= ~RV3029C2_IRQ_CTRL_AIE;
ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_CTRL, buf, 1);
if (ret < 0) {
dev_err(&client->dev, "can't set INT reg\n");
return ret;
}
return 0;
}
static int rv3029c2_rtc_i2c_set_alarm(struct i2c_client *client,
struct rtc_wkalrm *alarm)
{
struct rtc_time *const tm = &alarm->time;
int ret;
u8 regs[8];
/*
* The clock has an 8 bit wide bcd-coded register (they never learn)
* for the year. tm_year is an offset from 1900 and we are interested
* in the 2000-2099 range, so any value less than 100 is invalid.
*/
if (tm->tm_year < 100)
return -EINVAL;
ret = rv3029c2_i2c_get_sr(client, regs);
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
return -EIO;
}
regs[RV3029C2_A_SC-RV3029C2_A_SC] = bin2bcd(tm->tm_sec & 0x7f);
regs[RV3029C2_A_MN-RV3029C2_A_SC] = bin2bcd(tm->tm_min & 0x7f);
regs[RV3029C2_A_HR-RV3029C2_A_SC] = bin2bcd(tm->tm_hour & 0x3f);
regs[RV3029C2_A_DT-RV3029C2_A_SC] = bin2bcd(tm->tm_mday & 0x3f);
regs[RV3029C2_A_MO-RV3029C2_A_SC] = bin2bcd((tm->tm_mon & 0x1f) - 1);
regs[RV3029C2_A_DW-RV3029C2_A_SC] = bin2bcd((tm->tm_wday & 7) - 1);
regs[RV3029C2_A_YR-RV3029C2_A_SC] = bin2bcd((tm->tm_year & 0x7f) - 100);
ret = rv3029c2_i2c_write_regs(client, RV3029C2_A_SC, regs,
RV3029C2_ALARM_SECTION_LEN);
if (ret < 0)
return ret;
if (alarm->enabled) {
u8 buf[1];
/* clear AF flag */
ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_FLAGS,
buf, 1);
if (ret < 0) {
dev_err(&client->dev, "can't read alarm flag\n");
return ret;
}
buf[0] &= ~RV3029C2_IRQ_FLAGS_AF;
ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_FLAGS,
buf, 1);
if (ret < 0) {
dev_err(&client->dev, "can't set alarm flag\n");
return ret;
}
/* enable AIE irq */
ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 1);
if (ret)
return ret;
dev_dbg(&client->dev, "alarm IRQ armed\n");
} else {
/* disable AIE irq */
ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 1);
if (ret)
return ret;
dev_dbg(&client->dev, "alarm IRQ disabled\n");
}
return 0;
}
static int rv3029c2_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
return rv3029c2_rtc_i2c_set_alarm(to_i2c_client(dev), alarm);
}
static int
rv3029c2_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
{
u8 regs[8];
int ret;
/*
* The clock has an 8 bit wide bcd-coded register (they never learn)
* for the year. tm_year is an offset from 1900 and we are interested
* in the 2000-2099 range, so any value less than 100 is invalid.
*/
if (tm->tm_year < 100)
return -EINVAL;
regs[RV3029C2_W_SEC-RV3029C2_W_SEC] = bin2bcd(tm->tm_sec);
regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC] = bin2bcd(tm->tm_min);
regs[RV3029C2_W_HOURS-RV3029C2_W_SEC] = bin2bcd(tm->tm_hour);
regs[RV3029C2_W_DATE-RV3029C2_W_SEC] = bin2bcd(tm->tm_mday);
regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC] = bin2bcd(tm->tm_mon+1);
regs[RV3029C2_W_DAYS-RV3029C2_W_SEC] = bin2bcd((tm->tm_wday & 7)+1);
regs[RV3029C2_W_YEARS-RV3029C2_W_SEC] = bin2bcd(tm->tm_year - 100);
ret = rv3029c2_i2c_write_regs(client, RV3029C2_W_SEC, regs,
RV3029C2_WATCH_SECTION_LEN);
if (ret < 0)
return ret;
ret = rv3029c2_i2c_get_sr(client, regs);
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
return ret;
}
/* clear PON bit */
ret = rv3029c2_i2c_set_sr(client, (regs[0] & ~RV3029C2_STATUS_PON));
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
return ret;
}
return 0;
}
static int rv3029c2_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
return rv3029c2_i2c_set_time(to_i2c_client(dev), tm);
}
static const struct rtc_class_ops rv3029c2_rtc_ops = {
.read_time = rv3029c2_rtc_read_time,
.set_time = rv3029c2_rtc_set_time,
.read_alarm = rv3029c2_rtc_read_alarm,
.set_alarm = rv3029c2_rtc_set_alarm,
};
static struct i2c_device_id rv3029c2_id[] = {
{ "rv3029c2", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, rv3029c2_id);
static int __devinit
rv3029c2_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct rtc_device *rtc;
int rc = 0;
u8 buf[1];
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_EMUL))
return -ENODEV;
rtc = rtc_device_register(client->name,
&client->dev, &rv3029c2_rtc_ops,
THIS_MODULE);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
i2c_set_clientdata(client, rtc);
rc = rv3029c2_i2c_get_sr(client, buf);
if (rc < 0) {
dev_err(&client->dev, "reading status failed\n");
goto exit_unregister;
}
return 0;
exit_unregister:
rtc_device_unregister(rtc);
return rc;
}
static int __devexit rv3029c2_remove(struct i2c_client *client)
{
struct rtc_device *rtc = i2c_get_clientdata(client);
rtc_device_unregister(rtc);
return 0;
}
static struct i2c_driver rv3029c2_driver = {
.driver = {
.name = "rtc-rv3029c2",
},
.probe = rv3029c2_probe,
.remove = __devexit_p(rv3029c2_remove),
.id_table = rv3029c2_id,
};
module_i2c_driver(rv3029c2_driver);
MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
MODULE_DESCRIPTION("Micro Crystal RV3029C2 RTC driver");
MODULE_LICENSE("GPL");
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