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rtc: rx8581: Add support for Epson rx8571 RTC

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Add support for Epson rx8571 real-time clock. rx8571 rtc is compatible
with rx8581,except that rx8571 has additional 16 bytes of RAM.

16 bytes of nvmem is supported and exposed in sysfs (# is the instance
number,starting with 0): /sys/bus/nvmem/devices/rx8571-#/nvmem

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Biju Das 2019-02-21 09:40:45 +00:00 committed by Alexandre Belloni
parent 57e883b576
commit 51f896ffd1
2 changed files with 108 additions and 11 deletions
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5
drivers/rtc/Kconfig
View File

@ -611,9 +611,10 @@ config RTC_DRV_RX8010
will be called rtc-rx8010.
config RTC_DRV_RX8581
tristate "Epson RX-8581"
tristate "Epson RX-8571/RX-8581"
help
If you say yes here you will get support for the Epson RX-8581.
If you say yes here you will get support for the Epson RX-8571/
RX-8581.
This driver can also be built as a module. If so the module
will be called rtc-rx8581.

114
drivers/rtc/rtc-rx8581.c
View File

@ -15,6 +15,8 @@
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/bcd.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/log2.h>
@ -51,11 +53,19 @@
#define RX8581_CTRL_STOP 0x02 /* STOP bit */
#define RX8581_CTRL_RESET 0x01 /* RESET bit */
#define RX8571_USER_RAM 0x10
#define RX8571_NVRAM_SIZE 0x10
struct rx8581 {
struct regmap *regmap;
struct rtc_device *rtc;
};
struct rx85x1_config {
struct regmap_config regmap;
unsigned int num_nvram;
};
/*
* In the routines that deal directly with the rx8581 hardware, we use
* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
@ -181,25 +191,103 @@ static const struct rtc_class_ops rx8581_rtc_ops = {
.set_time = rx8581_rtc_set_time,
};
static int rx8581_probe(struct i2c_client *client,
const struct i2c_device_id *id)
static int rx8571_nvram_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct rx8581 *rx8581;
static const struct regmap_config config = {
struct rx8581 *rx8581 = priv;
return regmap_bulk_read(rx8581->regmap, RX8571_USER_RAM + offset,
val, bytes);
}
static int rx8571_nvram_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct rx8581 *rx8581 = priv;
return regmap_bulk_write(rx8581->regmap, RX8571_USER_RAM + offset,
val, bytes);
}
static int rx85x1_nvram_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct rx8581 *rx8581 = priv;
unsigned int tmp_val;
int ret;
ret = regmap_read(rx8581->regmap, RX8581_REG_RAM, &tmp_val);
(*(unsigned char *)val) = (unsigned char) tmp_val;
return ret;
}
static int rx85x1_nvram_write(void *priv, unsigned int offset, void *val,
size_t bytes)
{
struct rx8581 *rx8581 = priv;
unsigned char tmp_val;
tmp_val = *((unsigned char *)val);
return regmap_write(rx8581->regmap, RX8581_REG_RAM,
(unsigned int)tmp_val);
}
static const struct rx85x1_config rx8581_config = {
.regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0xf,
},
.num_nvram = 1
};
static const struct rx85x1_config rx8571_config = {
.regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x1f,
},
.num_nvram = 2
};
static int rx8581_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct rx8581 *rx8581;
const struct rx85x1_config *config = &rx8581_config;
const void *data = of_device_get_match_data(&client->dev);
static struct nvmem_config nvmem_cfg[] = {
{
.name = "rx85x1-",
.word_size = 1,
.stride = 1,
.size = 1,
.reg_read = rx85x1_nvram_read,
.reg_write = rx85x1_nvram_write,
}, {
.name = "rx8571-",
.word_size = 1,
.stride = 1,
.size = RX8571_NVRAM_SIZE,
.reg_read = rx8571_nvram_read,
.reg_write = rx8571_nvram_write,
},
};
int ret, i;
dev_dbg(&client->dev, "%s\n", __func__);
if (data)
config = data;
rx8581 = devm_kzalloc(&client->dev, sizeof(struct rx8581), GFP_KERNEL);
if (!rx8581)
return -ENOMEM;
i2c_set_clientdata(client, rx8581);
rx8581->regmap = devm_regmap_init_i2c(client, &config);
rx8581->regmap = devm_regmap_init_i2c(client, &config->regmap);
if (IS_ERR(rx8581->regmap))
return PTR_ERR(rx8581->regmap);
@ -213,7 +301,14 @@ static int rx8581_probe(struct i2c_client *client,
rx8581->rtc->start_secs = 0;
rx8581->rtc->set_start_time = true;
return rtc_register_device(rx8581->rtc);
ret = rtc_register_device(rx8581->rtc);
for (i = 0; i < config->num_nvram; i++) {
nvmem_cfg[i].priv = rx8581;
rtc_nvmem_register(rx8581->rtc, &nvmem_cfg[i]);
}
return ret;
}
static const struct i2c_device_id rx8581_id[] = {
@ -223,8 +318,9 @@ static const struct i2c_device_id rx8581_id[] = {
MODULE_DEVICE_TABLE(i2c, rx8581_id);
static const struct of_device_id rx8581_of_match[] = {
{ .compatible = "epson,rx8581" },
{ }
{ .compatible = "epson,rx8571", .data = &rx8571_config },
{ .compatible = "epson,rx8581", .data = &rx8581_config },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, rx8581_of_match);
@ -240,5 +336,5 @@ static struct i2c_driver rx8581_driver = {
module_i2c_driver(rx8581_driver);
MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
MODULE_DESCRIPTION("Epson RX-8581 RTC driver");
MODULE_DESCRIPTION("Epson RX-8571/RX-8581 RTC driver");
MODULE_LICENSE("GPL");