Commit 907b3262 authored by Akinobu Mita's avatar Akinobu Mita Committed by Alexandre Belloni

rtc: pcf2127: convert to use regmap

pcf2127 has selectable I2C-bus and SPI-bus interface support.
Currently rtc-pcf2127 driver only supports I2C.

This is preparation for support for SPI interface.
Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent a696b31e
......@@ -19,6 +19,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#define PCF2127_REG_CTRL1 (0x00) /* Control Register 1 */
#define PCF2127_REG_CTRL2 (0x01) /* Control Register 2 */
......@@ -36,29 +37,30 @@
#define PCF2127_OSF BIT(7) /* Oscillator Fail flag */
static struct i2c_driver pcf2127_driver;
struct pcf2127 {
struct rtc_device *rtc;
struct regmap *regmap;
};
/*
* In the routines that deal directly with the pcf2127 hardware, we use
* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
*/
static int pcf2127_get_datetime(struct i2c_client *client, struct rtc_time *tm)
static int pcf2127_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
unsigned char buf[10] = { PCF2127_REG_CTRL1 };
struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
unsigned char buf[10];
int ret;
/* read registers */
if (i2c_master_send(client, buf, 1) != 1 ||
i2c_master_recv(client, buf, sizeof(buf)) != sizeof(buf)) {
dev_err(&client->dev, "%s: read error\n", __func__);
return -EIO;
ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_CTRL1, buf,
sizeof(buf));
if (ret) {
dev_err(dev, "%s: read error\n", __func__);
return ret;
}
if (buf[PCF2127_REG_CTRL3] & PCF2127_REG_CTRL3_BLF)
dev_info(&client->dev,
dev_info(dev,
"low voltage detected, check/replace RTC battery.\n");
if (buf[PCF2127_REG_SC] & PCF2127_OSF) {
......@@ -66,12 +68,12 @@ static int pcf2127_get_datetime(struct i2c_client *client, struct rtc_time *tm)
* no need clear the flag here,
* it will be cleared once the new date is saved
*/
dev_warn(&client->dev,
dev_warn(dev,
"oscillator stop detected, date/time is not reliable\n");
return -EINVAL;
}
dev_dbg(&client->dev,
dev_dbg(dev,
"%s: raw data is cr1=%02x, cr2=%02x, cr3=%02x, "
"sec=%02x, min=%02x, hr=%02x, "
"mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
......@@ -91,7 +93,7 @@ static int pcf2127_get_datetime(struct i2c_client *client, struct rtc_time *tm)
if (tm->tm_year < 70)
tm->tm_year += 100; /* assume we are in 1970...2069 */
dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
__func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
......@@ -100,20 +102,18 @@ static int pcf2127_get_datetime(struct i2c_client *client, struct rtc_time *tm)
return rtc_valid_tm(tm);
}
static int pcf2127_set_datetime(struct i2c_client *client, struct rtc_time *tm)
static int pcf2127_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
unsigned char buf[8];
struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
unsigned char buf[7];
int i = 0, err;
dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
__func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
/* start register address */
buf[i++] = PCF2127_REG_SC;
/* hours, minutes and seconds */
buf[i++] = bin2bcd(tm->tm_sec); /* this will also clear OSF flag */
buf[i++] = bin2bcd(tm->tm_min);
......@@ -128,11 +128,11 @@ static int pcf2127_set_datetime(struct i2c_client *client, struct rtc_time *tm)
buf[i++] = bin2bcd(tm->tm_year % 100);
/* write register's data */
err = i2c_master_send(client, buf, i);
if (err != i) {
dev_err(&client->dev,
err = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_SC, buf, i);
if (err) {
dev_err(dev,
"%s: err=%d", __func__, err);
return -EIO;
return err;
}
return 0;
......@@ -142,26 +142,17 @@ static int pcf2127_set_datetime(struct i2c_client *client, struct rtc_time *tm)
static int pcf2127_rtc_ioctl(struct device *dev,
unsigned int cmd, unsigned long arg)
{
struct i2c_client *client = to_i2c_client(dev);
unsigned char buf = PCF2127_REG_CTRL3;
struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
int touser;
int ret;
switch (cmd) {
case RTC_VL_READ:
ret = i2c_master_send(client, &buf, 1);
if (!ret)
ret = -EIO;
if (ret < 0)
return ret;
ret = i2c_master_recv(client, &buf, 1);
if (!ret)
ret = -EIO;
if (ret < 0)
ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL3, &touser);
if (ret)
return ret;
touser = buf & PCF2127_REG_CTRL3_BLF ? 1 : 0;
touser = touser & PCF2127_REG_CTRL3_BLF ? 1 : 0;
if (copy_to_user((void __user *)arg, &touser, sizeof(int)))
return -EFAULT;
......@@ -174,52 +165,33 @@ static int pcf2127_rtc_ioctl(struct device *dev,
#define pcf2127_rtc_ioctl NULL
#endif
static int pcf2127_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
return pcf2127_get_datetime(to_i2c_client(dev), tm);
}
static int pcf2127_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
return pcf2127_set_datetime(to_i2c_client(dev), tm);
}
static const struct rtc_class_ops pcf2127_rtc_ops = {
.ioctl = pcf2127_rtc_ioctl,
.read_time = pcf2127_rtc_read_time,
.set_time = pcf2127_rtc_set_time,
};
static int pcf2127_probe(struct i2c_client *client,
const struct i2c_device_id *id)
static int pcf2127_probe(struct device *dev, struct regmap *regmap,
const char *name)
{
struct pcf2127 *pcf2127;
dev_dbg(&client->dev, "%s\n", __func__);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
dev_dbg(dev, "%s\n", __func__);
pcf2127 = devm_kzalloc(&client->dev, sizeof(struct pcf2127),
GFP_KERNEL);
pcf2127 = devm_kzalloc(dev, sizeof(*pcf2127), GFP_KERNEL);
if (!pcf2127)
return -ENOMEM;
i2c_set_clientdata(client, pcf2127);
pcf2127->regmap = regmap;
pcf2127->rtc = devm_rtc_device_register(&client->dev,
pcf2127_driver.driver.name,
&pcf2127_rtc_ops, THIS_MODULE);
dev_set_drvdata(dev, pcf2127);
pcf2127->rtc = devm_rtc_device_register(dev, name, &pcf2127_rtc_ops,
THIS_MODULE);
return PTR_ERR_OR_ZERO(pcf2127->rtc);
}
static const struct i2c_device_id pcf2127_id[] = {
{ "pcf2127", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pcf2127_id);
#ifdef CONFIG_OF
static const struct of_device_id pcf2127_of_match[] = {
{ .compatible = "nxp,pcf2127" },
......@@ -228,16 +200,118 @@ static const struct of_device_id pcf2127_of_match[] = {
MODULE_DEVICE_TABLE(of, pcf2127_of_match);
#endif
static struct i2c_driver pcf2127_driver = {
static int pcf2127_i2c_write(void *context, const void *data, size_t count)
{
struct device *dev = context;
struct i2c_client *client = to_i2c_client(dev);
int ret;
ret = i2c_master_send(client, data, count);
if (ret != count)
return ret < 0 ? ret : -EIO;
return 0;
}
static int pcf2127_i2c_gather_write(void *context,
const void *reg, size_t reg_size,
const void *val, size_t val_size)
{
struct device *dev = context;
struct i2c_client *client = to_i2c_client(dev);
int ret;
void *buf;
if (WARN_ON(reg_size != 1))
return -EINVAL;
buf = kmalloc(val_size + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
memcpy(buf, reg, 1);
memcpy(buf + 1, val, val_size);
ret = i2c_master_send(client, buf, val_size + 1);
if (ret != val_size + 1)
return ret < 0 ? ret : -EIO;
return 0;
}
static int pcf2127_i2c_read(void *context, const void *reg, size_t reg_size,
void *val, size_t val_size)
{
struct device *dev = context;
struct i2c_client *client = to_i2c_client(dev);
int ret;
if (WARN_ON(reg_size != 1))
return -EINVAL;
ret = i2c_master_send(client, reg, 1);
if (ret != 1)
return ret < 0 ? ret : -EIO;
ret = i2c_master_recv(client, val, val_size);
if (ret != val_size)
return ret < 0 ? ret : -EIO;
return 0;
}
/*
* The reason we need this custom regmap_bus instead of using regmap_init_i2c()
* is that the STOP condition is required between set register address and
* read register data when reading from registers.
*/
static const struct regmap_bus pcf2127_i2c_regmap = {
.write = pcf2127_i2c_write,
.gather_write = pcf2127_i2c_gather_write,
.read = pcf2127_i2c_read,
};
static struct i2c_driver pcf2127_i2c_driver;
static int pcf2127_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct regmap *regmap;
static const struct regmap_config config = {
.reg_bits = 8,
.val_bits = 8,
};
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
regmap = devm_regmap_init(&client->dev, &pcf2127_i2c_regmap,
&client->dev, &config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
__func__, PTR_ERR(regmap));
return PTR_ERR(regmap);
}
return pcf2127_probe(&client->dev, regmap,
pcf2127_i2c_driver.driver.name);
}
static const struct i2c_device_id pcf2127_i2c_id[] = {
{ "pcf2127", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pcf2127_i2c_id);
static struct i2c_driver pcf2127_i2c_driver = {
.driver = {
.name = "rtc-pcf2127",
.name = "rtc-pcf2127-i2c",
.of_match_table = of_match_ptr(pcf2127_of_match),
},
.probe = pcf2127_probe,
.id_table = pcf2127_id,
.probe = pcf2127_i2c_probe,
.id_table = pcf2127_i2c_id,
};
module_i2c_driver(pcf2127_driver);
module_i2c_driver(pcf2127_i2c_driver);
MODULE_AUTHOR("Renaud Cerrato <r.cerrato@til-technologies.fr>");
MODULE_DESCRIPTION("NXP PCF2127 RTC driver");
......
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