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path: root/drivers/rtc/rtc-pcf2127.c
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Diffstat (limited to 'drivers/rtc/rtc-pcf2127.c')
-rw-r--r--drivers/rtc/rtc-pcf2127.c335
1 files changed, 263 insertions, 72 deletions
diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 629bfdf8c745..2bfdf638b673 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -1,12 +1,12 @@
/*
- * An I2C driver for the NXP PCF2127 RTC
+ * An I2C and SPI driver for the NXP PCF2127/29 RTC
* Copyright 2013 Til-Technologies
*
* Author: Renaud Cerrato <r.cerrato@til-technologies.fr>
*
* based on the other drivers in this same directory.
*
- * http://www.nxp.com/documents/data_sheet/PCF2127AT.pdf
+ * Datasheet: http://cache.nxp.com/documents/data_sheet/PCF2127.pdf
*
* 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
@@ -14,11 +14,13 @@
*/
#include <linux/i2c.h>
+#include <linux/spi/spi.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#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 +38,30 @@
#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 +69,12 @@ 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 +94,7 @@ 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 +103,18 @@ 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 +129,11 @@ 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 +143,17 @@ 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;
@@ -174,71 +166,270 @@ 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__);
+ dev_dbg(dev, "%s\n", __func__);
- if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
- return -ENODEV;
-
- 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;
+
+ dev_set_drvdata(dev, pcf2127);
- pcf2127->rtc = devm_rtc_device_register(&client->dev,
- pcf2127_driver.driver.name,
- &pcf2127_rtc_ops, THIS_MODULE);
+ 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" },
+ { .compatible = "nxp,pcf2129" },
{}
};
MODULE_DEVICE_TABLE(of, pcf2127_of_match);
#endif
-static struct i2c_driver pcf2127_driver = {
+#if IS_ENABLED(CONFIG_I2C)
+
+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 },
+ { "pcf2129", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pcf2127_i2c_id);
+
+static struct i2c_driver pcf2127_i2c_driver = {
+ .driver = {
+ .name = "rtc-pcf2127-i2c",
+ .of_match_table = of_match_ptr(pcf2127_of_match),
+ },
+ .probe = pcf2127_i2c_probe,
+ .id_table = pcf2127_i2c_id,
+};
+
+static int pcf2127_i2c_register_driver(void)
+{
+ return i2c_add_driver(&pcf2127_i2c_driver);
+}
+
+static void pcf2127_i2c_unregister_driver(void)
+{
+ i2c_del_driver(&pcf2127_i2c_driver);
+}
+
+#else
+
+static int pcf2127_i2c_register_driver(void)
+{
+ return 0;
+}
+
+static void pcf2127_i2c_unregister_driver(void)
+{
+}
+
+#endif
+
+#if IS_ENABLED(CONFIG_SPI_MASTER)
+
+static struct spi_driver pcf2127_spi_driver;
+
+static int pcf2127_spi_probe(struct spi_device *spi)
+{
+ static const struct regmap_config config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .read_flag_mask = 0xa0,
+ .write_flag_mask = 0x20,
+ };
+ struct regmap *regmap;
+
+ regmap = devm_regmap_init_spi(spi, &config);
+ if (IS_ERR(regmap)) {
+ dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
+ __func__, PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ return pcf2127_probe(&spi->dev, regmap, pcf2127_spi_driver.driver.name);
+}
+
+static const struct spi_device_id pcf2127_spi_id[] = {
+ { "pcf2127", 0 },
+ { "pcf2129", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, pcf2127_spi_id);
+
+static struct spi_driver pcf2127_spi_driver = {
.driver = {
- .name = "rtc-pcf2127",
+ .name = "rtc-pcf2127-spi",
.of_match_table = of_match_ptr(pcf2127_of_match),
},
- .probe = pcf2127_probe,
- .id_table = pcf2127_id,
+ .probe = pcf2127_spi_probe,
+ .id_table = pcf2127_spi_id,
};
-module_i2c_driver(pcf2127_driver);
+static int pcf2127_spi_register_driver(void)
+{
+ return spi_register_driver(&pcf2127_spi_driver);
+}
+
+static void pcf2127_spi_unregister_driver(void)
+{
+ spi_unregister_driver(&pcf2127_spi_driver);
+}
+
+#else
+
+static int pcf2127_spi_register_driver(void)
+{
+ return 0;
+}
+
+static void pcf2127_spi_unregister_driver(void)
+{
+}
+
+#endif
+
+static int __init pcf2127_init(void)
+{
+ int ret;
+
+ ret = pcf2127_i2c_register_driver();
+ if (ret) {
+ pr_err("Failed to register pcf2127 i2c driver: %d\n", ret);
+ return ret;
+ }
+
+ ret = pcf2127_spi_register_driver();
+ if (ret) {
+ pr_err("Failed to register pcf2127 spi driver: %d\n", ret);
+ pcf2127_i2c_unregister_driver();
+ }
+
+ return ret;
+}
+module_init(pcf2127_init)
+
+static void __exit pcf2127_exit(void)
+{
+ pcf2127_spi_unregister_driver();
+ pcf2127_i2c_unregister_driver();
+}
+module_exit(pcf2127_exit)
MODULE_AUTHOR("Renaud Cerrato <r.cerrato@til-technologies.fr>");
-MODULE_DESCRIPTION("NXP PCF2127 RTC driver");
+MODULE_DESCRIPTION("NXP PCF2127/29 RTC driver");
MODULE_LICENSE("GPL v2");