Release 4.12 drivers/rtc/rtc-max6900.c
/*
* rtc class driver for the Maxim MAX6900 chip
*
* Author: Dale Farnsworth <dale@farnsworth.org>
*
* based on previously existing rtc class drivers
*
* 2007 (c) MontaVista, Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/delay.h>
/*
* register indices
*/
#define MAX6900_REG_SC 0
/* seconds 00-59 */
#define MAX6900_REG_MN 1
/* minutes 00-59 */
#define MAX6900_REG_HR 2
/* hours 00-23 */
#define MAX6900_REG_DT 3
/* day of month 00-31 */
#define MAX6900_REG_MO 4
/* month 01-12 */
#define MAX6900_REG_DW 5
/* day of week 1-7 */
#define MAX6900_REG_YR 6
/* year 00-99 */
#define MAX6900_REG_CT 7
/* control */
/* register 8 is undocumented */
#define MAX6900_REG_CENTURY 9
/* century */
#define MAX6900_REG_LEN 10
#define MAX6900_BURST_LEN 8
/* can burst r/w first 8 regs */
#define MAX6900_REG_CT_WP (1 << 7)
/* Write Protect */
/*
* register read/write commands
*/
#define MAX6900_REG_CONTROL_WRITE 0x8e
#define MAX6900_REG_CENTURY_WRITE 0x92
#define MAX6900_REG_CENTURY_READ 0x93
#define MAX6900_REG_RESERVED_READ 0x96
#define MAX6900_REG_BURST_WRITE 0xbe
#define MAX6900_REG_BURST_READ 0xbf
#define MAX6900_IDLE_TIME_AFTER_WRITE 3
/* specification says 2.5 mS */
static struct i2c_driver max6900_driver;
static int max6900_i2c_read_regs(struct i2c_client *client, u8 *buf)
{
u8 reg_burst_read[1] = { MAX6900_REG_BURST_READ };
u8 reg_century_read[1] = { MAX6900_REG_CENTURY_READ };
struct i2c_msg msgs[4] = {
{
.addr = client->addr,
.flags = 0, /* write */
.len = sizeof(reg_burst_read),
.buf = reg_burst_read}
,
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = MAX6900_BURST_LEN,
.buf = buf}
,
{
.addr = client->addr,
.flags = 0, /* write */
.len = sizeof(reg_century_read),
.buf = reg_century_read}
,
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = sizeof(buf[MAX6900_REG_CENTURY]),
.buf = &buf[MAX6900_REG_CENTURY]
}
};
int rc;
rc = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (rc != ARRAY_SIZE(msgs)) {
dev_err(&client->dev, "%s: register read failed\n", __func__);
return -EIO;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 206 | 99.52% | 2 | 66.67% |
| Harvey Harrison | 1 | 0.48% | 1 | 33.33% |
| Total | 207 | 100.00% | 3 | 100.00% |
static int max6900_i2c_write_regs(struct i2c_client *client, u8 const *buf)
{
u8 i2c_century_buf[1 + 1] = { MAX6900_REG_CENTURY_WRITE };
struct i2c_msg century_msgs[1] = {
{
.addr = client->addr,
.flags = 0, /* write */
.len = sizeof(i2c_century_buf),
.buf = i2c_century_buf}
};
u8 i2c_burst_buf[MAX6900_BURST_LEN + 1] = { MAX6900_REG_BURST_WRITE };
struct i2c_msg burst_msgs[1] = {
{
.addr = client->addr,
.flags = 0, /* write */
.len = sizeof(i2c_burst_buf),
.buf = i2c_burst_buf}
};
int rc;
/*
* We have to make separate calls to i2c_transfer because of
* the need to delay after each write to the chip. Also,
* we write the century byte first, since we set the write-protect
* bit as part of the burst write.
*/
i2c_century_buf[1] = buf[MAX6900_REG_CENTURY];
rc = i2c_transfer(client->adapter, century_msgs,
ARRAY_SIZE(century_msgs));
if (rc != ARRAY_SIZE(century_msgs))
goto write_failed;
msleep(MAX6900_IDLE_TIME_AFTER_WRITE);
memcpy(&i2c_burst_buf[1], buf, MAX6900_BURST_LEN);
rc = i2c_transfer(client->adapter, burst_msgs, ARRAY_SIZE(burst_msgs));
if (rc != ARRAY_SIZE(burst_msgs))
goto write_failed;
msleep(MAX6900_IDLE_TIME_AFTER_WRITE);
return 0;
write_failed:
dev_err(&client->dev, "%s: register write failed\n", __func__);
return -EIO;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 227 | 99.56% | 2 | 66.67% |
| Harvey Harrison | 1 | 0.44% | 1 | 33.33% |
| Total | 228 | 100.00% | 3 | 100.00% |
static int max6900_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
{
int rc;
u8 regs[MAX6900_REG_LEN];
rc = max6900_i2c_read_regs(client, regs);
if (rc < 0)
return rc;
tm->tm_sec = bcd2bin(regs[MAX6900_REG_SC]);
tm->tm_min = bcd2bin(regs[MAX6900_REG_MN]);
tm->tm_hour = bcd2bin(regs[MAX6900_REG_HR] & 0x3f);
tm->tm_mday = bcd2bin(regs[MAX6900_REG_DT]);
tm->tm_mon = bcd2bin(regs[MAX6900_REG_MO]) - 1;
tm->tm_year = bcd2bin(regs[MAX6900_REG_YR]) +
bcd2bin(regs[MAX6900_REG_CENTURY]) * 100 - 1900;
tm->tm_wday = bcd2bin(regs[MAX6900_REG_DW]);
return rtc_valid_tm(tm);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 137 | 91.95% | 2 | 50.00% |
| Adrian Bunk | 8 | 5.37% | 1 | 25.00% |
| Wan ZongShun | 4 | 2.68% | 1 | 25.00% |
| Total | 149 | 100.00% | 4 | 100.00% |
static int max6900_i2c_clear_write_protect(struct i2c_client *client)
{
return i2c_smbus_write_byte_data(client, MAX6900_REG_CONTROL_WRITE, 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 20 | 95.24% | 1 | 50.00% |
| Sachin Kamat | 1 | 4.76% | 1 | 50.00% |
| Total | 21 | 100.00% | 2 | 100.00% |
static int
max6900_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
{
u8 regs[MAX6900_REG_LEN];
int rc;
rc = max6900_i2c_clear_write_protect(client);
if (rc < 0)
return rc;
regs[MAX6900_REG_SC] = bin2bcd(tm->tm_sec);
regs[MAX6900_REG_MN] = bin2bcd(tm->tm_min);
regs[MAX6900_REG_HR] = bin2bcd(tm->tm_hour);
regs[MAX6900_REG_DT] = bin2bcd(tm->tm_mday);
regs[MAX6900_REG_MO] = bin2bcd(tm->tm_mon + 1);
regs[MAX6900_REG_DW] = bin2bcd(tm->tm_wday);
regs[MAX6900_REG_YR] = bin2bcd(tm->tm_year % 100);
regs[MAX6900_REG_CENTURY] = bin2bcd((tm->tm_year + 1900) / 100);
/* set write protect */
regs[MAX6900_REG_CT] = MAX6900_REG_CT_WP;
rc = max6900_i2c_write_regs(client, regs);
if (rc < 0)
return rc;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 169 | 95.48% | 2 | 66.67% |
| Adrian Bunk | 8 | 4.52% | 1 | 33.33% |
| Total | 177 | 100.00% | 3 | 100.00% |
static int max6900_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
return max6900_i2c_read_time(to_i2c_client(dev), tm);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 27 | 100.00% | 1 | 100.00% |
| Total | 27 | 100.00% | 1 | 100.00% |
static int max6900_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
return max6900_i2c_set_time(to_i2c_client(dev), tm);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 27 | 100.00% | 1 | 100.00% |
| Total | 27 | 100.00% | 1 | 100.00% |
static const struct rtc_class_ops max6900_rtc_ops = {
.read_time = max6900_rtc_read_time,
.set_time = max6900_rtc_set_time,
};
static int
max6900_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct rtc_device *rtc;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
rtc = devm_rtc_device_register(&client->dev, max6900_driver.driver.name,
&max6900_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
i2c_set_clientdata(client, rtc);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 63 | 76.83% | 1 | 33.33% |
| Alessandro Zummo | 13 | 15.85% | 1 | 33.33% |
| Jingoo Han | 6 | 7.32% | 1 | 33.33% |
| Total | 82 | 100.00% | 3 | 100.00% |
static struct i2c_device_id max6900_id[] = {
{ "max6900", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max6900_id);
static struct i2c_driver max6900_driver = {
.driver = {
.name = "rtc-max6900",
},
.probe = max6900_probe,
.id_table = max6900_id,
};
module_i2c_driver(max6900_driver);
MODULE_DESCRIPTION("Maxim MAX6900 RTC driver");
MODULE_AUTHOR("Dale Farnsworth <dale@farnsworth.org>");
MODULE_LICENSE("GPL");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dale Farnsworth | 1010 | 90.34% | 2 | 18.18% |
| Alessandro Zummo | 71 | 6.35% | 2 | 18.18% |
| Adrian Bunk | 16 | 1.43% | 1 | 9.09% |
| Axel Lin | 8 | 0.72% | 2 | 18.18% |
| Jingoo Han | 6 | 0.54% | 1 | 9.09% |
| Wan ZongShun | 4 | 0.36% | 1 | 9.09% |
| Harvey Harrison | 2 | 0.18% | 1 | 9.09% |
| Sachin Kamat | 1 | 0.09% | 1 | 9.09% |
| Total | 1118 | 100.00% | 11 | 100.00% |
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