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path: root/drivers/rtc/rtc-ds2404.c
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Diffstat (limited to 'drivers/rtc/rtc-ds2404.c')
-rw-r--r--drivers/rtc/rtc-ds2404.c169
1 files changed, 69 insertions, 100 deletions
diff --git a/drivers/rtc/rtc-ds2404.c b/drivers/rtc/rtc-ds2404.c
index 0480f592307e..3231fd9f61da 100644
--- a/drivers/rtc/rtc-ds2404.c
+++ b/drivers/rtc/rtc-ds2404.c
@@ -7,9 +7,8 @@
#include <linux/rtc.h>
#include <linux/types.h>
#include <linux/bcd.h>
-#include <linux/platform_data/rtc-ds2404.h>
#include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/io.h>
@@ -27,164 +26,140 @@
#define DS2404_CLK 1
#define DS2404_DQ 2
-struct ds2404_gpio {
- const char *name;
- unsigned int gpio;
-};
-
struct ds2404 {
- struct ds2404_gpio *gpio;
+ struct device *dev;
+ struct gpio_desc *rst_gpiod;
+ struct gpio_desc *clk_gpiod;
+ struct gpio_desc *dq_gpiod;
struct rtc_device *rtc;
};
-static struct ds2404_gpio ds2404_gpio[] = {
- { "RTC RST", 0 },
- { "RTC CLK", 0 },
- { "RTC DQ", 0 },
-};
-
-static int ds2404_gpio_map(struct ds2404 *chip, struct platform_device *pdev,
- struct ds2404_platform_data *pdata)
+static int ds2404_gpio_map(struct ds2404 *chip, struct platform_device *pdev)
{
- int i, err;
-
- ds2404_gpio[DS2404_RST].gpio = pdata->gpio_rst;
- ds2404_gpio[DS2404_CLK].gpio = pdata->gpio_clk;
- ds2404_gpio[DS2404_DQ].gpio = pdata->gpio_dq;
-
- for (i = 0; i < ARRAY_SIZE(ds2404_gpio); i++) {
- err = gpio_request(ds2404_gpio[i].gpio, ds2404_gpio[i].name);
- if (err) {
- dev_err(&pdev->dev, "error mapping gpio %s: %d\n",
- ds2404_gpio[i].name, err);
- goto err_request;
- }
- if (i != DS2404_DQ)
- gpio_direction_output(ds2404_gpio[i].gpio, 1);
- }
+ struct device *dev = &pdev->dev;
- chip->gpio = ds2404_gpio;
- return 0;
+ /* This will de-assert RESET, declare this GPIO as GPIOD_ACTIVE_LOW */
+ chip->rst_gpiod = devm_gpiod_get(dev, "rst", GPIOD_OUT_LOW);
+ if (IS_ERR(chip->rst_gpiod))
+ return PTR_ERR(chip->rst_gpiod);
-err_request:
- while (--i >= 0)
- gpio_free(ds2404_gpio[i].gpio);
- return err;
-}
+ chip->clk_gpiod = devm_gpiod_get(dev, "clk", GPIOD_OUT_HIGH);
+ if (IS_ERR(chip->clk_gpiod))
+ return PTR_ERR(chip->clk_gpiod);
-static void ds2404_gpio_unmap(void *data)
-{
- int i;
+ chip->dq_gpiod = devm_gpiod_get(dev, "dq", GPIOD_ASIS);
+ if (IS_ERR(chip->dq_gpiod))
+ return PTR_ERR(chip->dq_gpiod);
- for (i = 0; i < ARRAY_SIZE(ds2404_gpio); i++)
- gpio_free(ds2404_gpio[i].gpio);
+ return 0;
}
-static void ds2404_reset(struct device *dev)
+static void ds2404_reset(struct ds2404 *chip)
{
- gpio_set_value(ds2404_gpio[DS2404_RST].gpio, 0);
+ gpiod_set_value(chip->rst_gpiod, 1);
udelay(1000);
- gpio_set_value(ds2404_gpio[DS2404_RST].gpio, 1);
- gpio_set_value(ds2404_gpio[DS2404_CLK].gpio, 0);
- gpio_direction_output(ds2404_gpio[DS2404_DQ].gpio, 0);
+ gpiod_set_value(chip->rst_gpiod, 0);
+ gpiod_set_value(chip->clk_gpiod, 0);
+ gpiod_direction_output(chip->dq_gpiod, 0);
udelay(10);
}
-static void ds2404_write_byte(struct device *dev, u8 byte)
+static void ds2404_write_byte(struct ds2404 *chip, u8 byte)
{
int i;
- gpio_direction_output(ds2404_gpio[DS2404_DQ].gpio, 1);
+ gpiod_direction_output(chip->dq_gpiod, 1);
for (i = 0; i < 8; i++) {
- gpio_set_value(ds2404_gpio[DS2404_DQ].gpio, byte & (1 << i));
+ gpiod_set_value(chip->dq_gpiod, byte & (1 << i));
udelay(10);
- gpio_set_value(ds2404_gpio[DS2404_CLK].gpio, 1);
+ gpiod_set_value(chip->clk_gpiod, 1);
udelay(10);
- gpio_set_value(ds2404_gpio[DS2404_CLK].gpio, 0);
+ gpiod_set_value(chip->clk_gpiod, 0);
udelay(10);
}
}
-static u8 ds2404_read_byte(struct device *dev)
+static u8 ds2404_read_byte(struct ds2404 *chip)
{
int i;
u8 ret = 0;
- gpio_direction_input(ds2404_gpio[DS2404_DQ].gpio);
+ gpiod_direction_input(chip->dq_gpiod);
for (i = 0; i < 8; i++) {
- gpio_set_value(ds2404_gpio[DS2404_CLK].gpio, 0);
+ gpiod_set_value(chip->clk_gpiod, 0);
udelay(10);
- if (gpio_get_value(ds2404_gpio[DS2404_DQ].gpio))
+ if (gpiod_get_value(chip->dq_gpiod))
ret |= 1 << i;
- gpio_set_value(ds2404_gpio[DS2404_CLK].gpio, 1);
+ gpiod_set_value(chip->clk_gpiod, 1);
udelay(10);
}
return ret;
}
-static void ds2404_read_memory(struct device *dev, u16 offset,
+static void ds2404_read_memory(struct ds2404 *chip, u16 offset,
int length, u8 *out)
{
- ds2404_reset(dev);
- ds2404_write_byte(dev, DS2404_READ_MEMORY_CMD);
- ds2404_write_byte(dev, offset & 0xff);
- ds2404_write_byte(dev, (offset >> 8) & 0xff);
+ ds2404_reset(chip);
+ ds2404_write_byte(chip, DS2404_READ_MEMORY_CMD);
+ ds2404_write_byte(chip, offset & 0xff);
+ ds2404_write_byte(chip, (offset >> 8) & 0xff);
while (length--)
- *out++ = ds2404_read_byte(dev);
+ *out++ = ds2404_read_byte(chip);
}
-static void ds2404_write_memory(struct device *dev, u16 offset,
+static void ds2404_write_memory(struct ds2404 *chip, u16 offset,
int length, u8 *out)
{
int i;
u8 ta01, ta02, es;
- ds2404_reset(dev);
- ds2404_write_byte(dev, DS2404_WRITE_SCRATCHPAD_CMD);
- ds2404_write_byte(dev, offset & 0xff);
- ds2404_write_byte(dev, (offset >> 8) & 0xff);
+ ds2404_reset(chip);
+ ds2404_write_byte(chip, DS2404_WRITE_SCRATCHPAD_CMD);
+ ds2404_write_byte(chip, offset & 0xff);
+ ds2404_write_byte(chip, (offset >> 8) & 0xff);
for (i = 0; i < length; i++)
- ds2404_write_byte(dev, out[i]);
+ ds2404_write_byte(chip, out[i]);
- ds2404_reset(dev);
- ds2404_write_byte(dev, DS2404_READ_SCRATCHPAD_CMD);
+ ds2404_reset(chip);
+ ds2404_write_byte(chip, DS2404_READ_SCRATCHPAD_CMD);
- ta01 = ds2404_read_byte(dev);
- ta02 = ds2404_read_byte(dev);
- es = ds2404_read_byte(dev);
+ ta01 = ds2404_read_byte(chip);
+ ta02 = ds2404_read_byte(chip);
+ es = ds2404_read_byte(chip);
for (i = 0; i < length; i++) {
- if (out[i] != ds2404_read_byte(dev)) {
- dev_err(dev, "read invalid data\n");
+ if (out[i] != ds2404_read_byte(chip)) {
+ dev_err(chip->dev, "read invalid data\n");
return;
}
}
- ds2404_reset(dev);
- ds2404_write_byte(dev, DS2404_COPY_SCRATCHPAD_CMD);
- ds2404_write_byte(dev, ta01);
- ds2404_write_byte(dev, ta02);
- ds2404_write_byte(dev, es);
+ ds2404_reset(chip);
+ ds2404_write_byte(chip, DS2404_COPY_SCRATCHPAD_CMD);
+ ds2404_write_byte(chip, ta01);
+ ds2404_write_byte(chip, ta02);
+ ds2404_write_byte(chip, es);
- gpio_direction_input(ds2404_gpio[DS2404_DQ].gpio);
- while (gpio_get_value(ds2404_gpio[DS2404_DQ].gpio))
+ while (gpiod_get_value(chip->dq_gpiod))
;
}
-static void ds2404_enable_osc(struct device *dev)
+static void ds2404_enable_osc(struct ds2404 *chip)
{
u8 in[1] = { 0x10 }; /* enable oscillator */
- ds2404_write_memory(dev, 0x201, 1, in);
+
+ ds2404_write_memory(chip, 0x201, 1, in);
}
static int ds2404_read_time(struct device *dev, struct rtc_time *dt)
{
+ struct ds2404 *chip = dev_get_drvdata(dev);
unsigned long time = 0;
__le32 hw_time = 0;
- ds2404_read_memory(dev, 0x203, 4, (u8 *)&hw_time);
+ ds2404_read_memory(chip, 0x203, 4, (u8 *)&hw_time);
time = le32_to_cpu(hw_time);
rtc_time64_to_tm(time, dt);
@@ -193,8 +168,9 @@ static int ds2404_read_time(struct device *dev, struct rtc_time *dt)
static int ds2404_set_time(struct device *dev, struct rtc_time *dt)
{
+ struct ds2404 *chip = dev_get_drvdata(dev);
u32 time = cpu_to_le32(rtc_tm_to_time64(dt));
- ds2404_write_memory(dev, 0x203, 4, (u8 *)&time);
+ ds2404_write_memory(chip, 0x203, 4, (u8 *)&time);
return 0;
}
@@ -205,7 +181,6 @@ static const struct rtc_class_ops ds2404_rtc_ops = {
static int rtc_probe(struct platform_device *pdev)
{
- struct ds2404_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct ds2404 *chip;
int retval = -EBUSY;
@@ -213,22 +188,16 @@ static int rtc_probe(struct platform_device *pdev)
if (!chip)
return -ENOMEM;
+ chip->dev = &pdev->dev;
+
chip->rtc = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(chip->rtc))
return PTR_ERR(chip->rtc);
- retval = ds2404_gpio_map(chip, pdev, pdata);
+ retval = ds2404_gpio_map(chip, pdev);
if (retval)
return retval;
- retval = devm_add_action_or_reset(&pdev->dev, ds2404_gpio_unmap, chip);
- if (retval)
- return retval;
-
- dev_info(&pdev->dev, "using GPIOs RST:%d, CLK:%d, DQ:%d\n",
- chip->gpio[DS2404_RST].gpio, chip->gpio[DS2404_CLK].gpio,
- chip->gpio[DS2404_DQ].gpio);
-
platform_set_drvdata(pdev, chip);
chip->rtc->ops = &ds2404_rtc_ops;
@@ -238,7 +207,7 @@ static int rtc_probe(struct platform_device *pdev)
if (retval)
return retval;
- ds2404_enable_osc(&pdev->dev);
+ ds2404_enable_osc(chip);
return 0;
}
generated by cgit (git 2.34.1) at 2024-06-19 08:01:42 +0000