iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

rtc: ds1347: changed raw spi calls to register map calls

Browse Source 
This patch changes calls of spi read write calls to register map
read and write calls in rtc ds1347

Signed-off-by: Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Raghavendra Ganiga 2016-08-31 22:56:41 +05:30 committed by Alexandre Belloni
parent 68669d55f7
commit ee85bb5bbe
2 changed files with 54 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/rtc/Kconfig
View File

@ -665,6 +665,7 @@ config RTC_DRV_DS1343
will be called rtc-ds1343.
config RTC_DRV_DS1347
select REGMAP_SPI
tristate "Dallas/Maxim DS1347"
help
If you say yes here you get support for the

96
drivers/rtc/rtc-ds1347.c
View File

@ -18,6 +18,7 @@
#include <linux/rtc.h>
#include <linux/spi/spi.h>
#include <linux/bcd.h>
#include <linux/regmap.h>
/* Registers in ds1347 rtc */
@ -32,37 +33,28 @@
#define DS1347_STATUS_REG 0x17
#define DS1347_CLOCK_BURST 0x3F
static int ds1347_read_reg(struct device *dev, unsigned char address,
unsigned char *data)
{
struct spi_device *spi = to_spi_device(dev);
static const struct regmap_range ds1347_ranges[] = {
{
.range_min = DS1347_SECONDS_REG,
.range_max = DS1347_STATUS_REG,
},
};
*data = address | 0x80;
return spi_write_then_read(spi, data, 1, data, 1);
}
static int ds1347_write_reg(struct device *dev, unsigned char address,
unsigned char data)
{
struct spi_device *spi = to_spi_device(dev);
unsigned char buf[2];
buf[0] = address & 0x7F;
buf[1] = data;
return spi_write_then_read(spi, buf, 2, NULL, 0);
}
static const struct regmap_access_table ds1347_access_table = {
.yes_ranges = ds1347_ranges,
.n_yes_ranges = ARRAY_SIZE(ds1347_ranges),
};
static int ds1347_read_time(struct device *dev, struct rtc_time *dt)
{
struct spi_device *spi = to_spi_device(dev);
struct regmap *map;
int err;
unsigned char buf[8];
buf[0] = DS1347_CLOCK_BURST | 0x80;
map = spi_get_drvdata(spi);
err = spi_write_then_read(spi, buf, 1, buf, 8);
err = regmap_bulk_read(map, DS1347_CLOCK_BURST, buf, 8);
if (err)
return err;
@ -80,25 +72,27 @@ static int ds1347_read_time(struct device *dev, struct rtc_time *dt)
static int ds1347_set_time(struct device *dev, struct rtc_time *dt)
{
struct spi_device *spi = to_spi_device(dev);
unsigned char buf[9];
struct regmap *map;
unsigned char buf[8];
buf[0] = DS1347_CLOCK_BURST & 0x7F;
buf[1] = bin2bcd(dt->tm_sec);
buf[2] = bin2bcd(dt->tm_min);
buf[3] = (bin2bcd(dt->tm_hour) & 0x3F);
buf[4] = bin2bcd(dt->tm_mday);
buf[5] = bin2bcd(dt->tm_mon + 1);
buf[6] = bin2bcd(dt->tm_wday + 1);
map = spi_get_drvdata(spi);
buf[0] = bin2bcd(dt->tm_sec);
buf[1] = bin2bcd(dt->tm_min);
buf[2] = (bin2bcd(dt->tm_hour) & 0x3F);
buf[3] = bin2bcd(dt->tm_mday);
buf[4] = bin2bcd(dt->tm_mon + 1);
buf[5] = bin2bcd(dt->tm_wday + 1);
/* year in linux is from 1900 i.e in range of 100
in rtc it is from 00 to 99 */
dt->tm_year = dt->tm_year % 100;
buf[7] = bin2bcd(dt->tm_year);
buf[8] = bin2bcd(0x00);
buf[6] = bin2bcd(dt->tm_year);
buf[7] = bin2bcd(0x00);
/* write the rtc settings */
return spi_write_then_read(spi, buf, 9, NULL, 0);
return regmap_bulk_write(map, DS1347_CLOCK_BURST, buf, 8);
}
static const struct rtc_class_ops ds1347_rtc_ops = {
@ -109,35 +103,53 @@ static const struct rtc_class_ops ds1347_rtc_ops = {
static int ds1347_probe(struct spi_device *spi)
{
struct rtc_device *rtc;
unsigned char data;
struct regmap_config config;
struct regmap *map;
unsigned int data;
int res;
memset(&config, 0, sizeof(config));
config.reg_bits = 8;
config.val_bits = 8;
config.read_flag_mask = 0x80;
config.max_register = 0x3F;
config.wr_table = &ds1347_access_table;
/* spi setup with ds1347 in mode 3 and bits per word as 8 */
spi->mode = SPI_MODE_3;
spi->bits_per_word = 8;
spi_setup(spi);
map = devm_regmap_init_spi(spi, &config);
if (IS_ERR(map)) {
dev_err(&spi->dev, "ds1347 regmap init spi failed\n");
return PTR_ERR(map);
}
spi_set_drvdata(spi, map);
/* RTC Settings */
res = ds1347_read_reg(&spi->dev, DS1347_SECONDS_REG, &data);
res = regmap_read(map, DS1347_SECONDS_REG, &data);
if (res)
return res;
/* Disable the write protect of rtc */
ds1347_read_reg(&spi->dev, DS1347_CONTROL_REG, &data);
regmap_read(map, DS1347_CONTROL_REG, &data);
data = data & ~(1<<7);
ds1347_write_reg(&spi->dev, DS1347_CONTROL_REG, data);
regmap_write(map, DS1347_CONTROL_REG, data);
/* Enable the oscillator , disable the oscillator stop flag,
and glitch filter to reduce current consumption */
ds1347_read_reg(&spi->dev, DS1347_STATUS_REG, &data);
regmap_read(map, DS1347_STATUS_REG, &data);
data = data & 0x1B;
ds1347_write_reg(&spi->dev, DS1347_STATUS_REG, data);
regmap_write(map, DS1347_STATUS_REG, data);
/* display the settings */
ds1347_read_reg(&spi->dev, DS1347_CONTROL_REG, &data);
regmap_read(map, DS1347_CONTROL_REG, &data);
dev_info(&spi->dev, "DS1347 RTC CTRL Reg = 0x%02x\n", data);
ds1347_read_reg(&spi->dev, DS1347_STATUS_REG, &data);
regmap_read(map, DS1347_STATUS_REG, &data);
dev_info(&spi->dev, "DS1347 RTC Status Reg = 0x%02x\n", data);
rtc = devm_rtc_device_register(&spi->dev, "ds1347",
@ -146,8 +158,6 @@ static int ds1347_probe(struct spi_device *spi)
if (IS_ERR(rtc))
return PTR_ERR(rtc);
spi_set_drvdata(spi, rtc);
return 0;
}