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path: root/drivers/rtc/rtc-pcf8523.c
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Diffstat (limited to 'drivers/rtc/rtc-pcf8523.c')
-rw-r--r--drivers/rtc/rtc-pcf8523.c434
1 files changed, 182 insertions, 252 deletions
diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
index 8b6fb20774bf..c93acade7205 100644
--- a/drivers/rtc/rtc-pcf8523.c
+++ b/drivers/rtc/rtc-pcf8523.c
@@ -4,8 +4,10 @@
*/
#include <linux/bcd.h>
+#include <linux/bitfield.h>
#include <linux/i2c.h>
#include <linux/module.h>
+#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/of.h>
#include <linux/pm_wakeirq.h>
@@ -19,11 +21,10 @@
#define PCF8523_CONTROL2_AF BIT(3)
#define PCF8523_REG_CONTROL3 0x02
-#define PCF8523_CONTROL3_PM_BLD BIT(7) /* battery low detection disabled */
-#define PCF8523_CONTROL3_PM_VDD BIT(6) /* switch-over disabled */
-#define PCF8523_CONTROL3_PM_DSM BIT(5) /* direct switching mode */
-#define PCF8523_CONTROL3_PM_MASK 0xe0
+#define PCF8523_CONTROL3_PM GENMASK(7,5)
+#define PCF8523_PM_STANDBY 0x7
#define PCF8523_CONTROL3_BLF BIT(2) /* battery low bit, read-only */
+#define PCF8523_CONTROL3_BSF BIT(3)
#define PCF8523_REG_SECONDS 0x03
#define PCF8523_SECONDS_OS BIT(7)
@@ -48,127 +49,45 @@
struct pcf8523 {
struct rtc_device *rtc;
- struct i2c_client *client;
+ struct regmap *regmap;
};
-static int pcf8523_read(struct i2c_client *client, u8 reg, u8 *valuep)
+static int pcf8523_load_capacitance(struct pcf8523 *pcf8523, struct device_node *node)
{
- struct i2c_msg msgs[2];
- u8 value = 0;
- int err;
-
- msgs[0].addr = client->addr;
- msgs[0].flags = 0;
- msgs[0].len = sizeof(reg);
- msgs[0].buf = &reg;
-
- msgs[1].addr = client->addr;
- msgs[1].flags = I2C_M_RD;
- msgs[1].len = sizeof(value);
- msgs[1].buf = &value;
-
- err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
- if (err < 0)
- return err;
-
- *valuep = value;
-
- return 0;
-}
-
-static int pcf8523_write(struct i2c_client *client, u8 reg, u8 value)
-{
- u8 buffer[2] = { reg, value };
- struct i2c_msg msg;
- int err;
-
- msg.addr = client->addr;
- msg.flags = 0;
- msg.len = sizeof(buffer);
- msg.buf = buffer;
-
- err = i2c_transfer(client->adapter, &msg, 1);
- if (err < 0)
- return err;
-
- return 0;
-}
-
-static int pcf8523_voltage_low(struct i2c_client *client)
-{
- u8 value;
- int err;
-
- err = pcf8523_read(client, PCF8523_REG_CONTROL3, &value);
- if (err < 0)
- return err;
-
- return !!(value & PCF8523_CONTROL3_BLF);
-}
-
-static int pcf8523_load_capacitance(struct i2c_client *client)
-{
- u32 load;
- u8 value;
- int err;
-
- err = pcf8523_read(client, PCF8523_REG_CONTROL1, &value);
- if (err < 0)
- return err;
+ u32 load, value = 0;
load = 12500;
- of_property_read_u32(client->dev.of_node, "quartz-load-femtofarads",
- &load);
+ of_property_read_u32(node, "quartz-load-femtofarads", &load);
switch (load) {
default:
- dev_warn(&client->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 12500",
+ dev_warn(&pcf8523->rtc->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 12500",
load);
fallthrough;
case 12500:
value |= PCF8523_CONTROL1_CAP_SEL;
break;
case 7000:
- value &= ~PCF8523_CONTROL1_CAP_SEL;
break;
}
- err = pcf8523_write(client, PCF8523_REG_CONTROL1, value);
-
- return err;
-}
-
-static int pcf8523_set_pm(struct i2c_client *client, u8 pm)
-{
- u8 value;
- int err;
-
- err = pcf8523_read(client, PCF8523_REG_CONTROL3, &value);
- if (err < 0)
- return err;
-
- value = (value & ~PCF8523_CONTROL3_PM_MASK) | pm;
-
- err = pcf8523_write(client, PCF8523_REG_CONTROL3, value);
- if (err < 0)
- return err;
-
- return 0;
+ return regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,
+ PCF8523_CONTROL1_CAP_SEL, value);
}
static irqreturn_t pcf8523_irq(int irq, void *dev_id)
{
- struct pcf8523 *pcf8523 = i2c_get_clientdata(dev_id);
- u8 value;
+ struct pcf8523 *pcf8523 = dev_id;
+ u32 value;
int err;
- err = pcf8523_read(pcf8523->client, PCF8523_REG_CONTROL2, &value);
+ err = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL2, &value);
if (err < 0)
return IRQ_HANDLED;
if (value & PCF8523_CONTROL2_AF) {
value &= ~PCF8523_CONTROL2_AF;
- pcf8523_write(pcf8523->client, PCF8523_REG_CONTROL2, value);
+ regmap_write(pcf8523->regmap, PCF8523_REG_CONTROL2, value);
rtc_update_irq(pcf8523->rtc, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;
@@ -177,68 +96,14 @@ static irqreturn_t pcf8523_irq(int irq, void *dev_id)
return IRQ_NONE;
}
-static int pcf8523_stop_rtc(struct i2c_client *client)
-{
- u8 value;
- int err;
-
- err = pcf8523_read(client, PCF8523_REG_CONTROL1, &value);
- if (err < 0)
- return err;
-
- value |= PCF8523_CONTROL1_STOP;
-
- err = pcf8523_write(client, PCF8523_REG_CONTROL1, value);
- if (err < 0)
- return err;
-
- return 0;
-}
-
-static int pcf8523_start_rtc(struct i2c_client *client)
-{
- u8 value;
- int err;
-
- err = pcf8523_read(client, PCF8523_REG_CONTROL1, &value);
- if (err < 0)
- return err;
-
- value &= ~PCF8523_CONTROL1_STOP;
-
- err = pcf8523_write(client, PCF8523_REG_CONTROL1, value);
- if (err < 0)
- return err;
-
- return 0;
-}
-
static int pcf8523_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
- struct i2c_client *client = to_i2c_client(dev);
- u8 start = PCF8523_REG_SECONDS, regs[7];
- struct i2c_msg msgs[2];
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
+ u8 regs[7];
int err;
- err = pcf8523_voltage_low(client);
- if (err < 0) {
- return err;
- } else if (err > 0) {
- dev_err(dev, "low voltage detected, time is unreliable\n");
- return -EINVAL;
- }
-
- msgs[0].addr = client->addr;
- msgs[0].flags = 0;
- msgs[0].len = 1;
- msgs[0].buf = &start;
-
- msgs[1].addr = client->addr;
- msgs[1].flags = I2C_M_RD;
- msgs[1].len = sizeof(regs);
- msgs[1].buf = regs;
-
- err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ err = regmap_bulk_read(pcf8523->regmap, PCF8523_REG_SECONDS, regs,
+ sizeof(regs));
if (err < 0)
return err;
@@ -258,63 +123,50 @@ static int pcf8523_rtc_read_time(struct device *dev, struct rtc_time *tm)
static int pcf8523_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct i2c_msg msg;
- u8 regs[8];
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
+ u8 regs[7];
int err;
- err = pcf8523_stop_rtc(client);
+ err = regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,
+ PCF8523_CONTROL1_STOP, PCF8523_CONTROL1_STOP);
if (err < 0)
return err;
- regs[0] = PCF8523_REG_SECONDS;
/* This will purposely overwrite PCF8523_SECONDS_OS */
- regs[1] = bin2bcd(tm->tm_sec);
- regs[2] = bin2bcd(tm->tm_min);
- regs[3] = bin2bcd(tm->tm_hour);
- regs[4] = bin2bcd(tm->tm_mday);
- regs[5] = tm->tm_wday;
- regs[6] = bin2bcd(tm->tm_mon + 1);
- regs[7] = bin2bcd(tm->tm_year - 100);
-
- msg.addr = client->addr;
- msg.flags = 0;
- msg.len = sizeof(regs);
- msg.buf = regs;
-
- err = i2c_transfer(client->adapter, &msg, 1);
+ regs[0] = bin2bcd(tm->tm_sec);
+ regs[1] = bin2bcd(tm->tm_min);
+ regs[2] = bin2bcd(tm->tm_hour);
+ regs[3] = bin2bcd(tm->tm_mday);
+ regs[4] = tm->tm_wday;
+ regs[5] = bin2bcd(tm->tm_mon + 1);
+ regs[6] = bin2bcd(tm->tm_year - 100);
+
+ err = regmap_bulk_write(pcf8523->regmap, PCF8523_REG_SECONDS, regs,
+ sizeof(regs));
if (err < 0) {
/*
* If the time cannot be set, restart the RTC anyway. Note
* that errors are ignored if the RTC cannot be started so
* that we have a chance to propagate the original error.
*/
- pcf8523_start_rtc(client);
+ regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,
+ PCF8523_CONTROL1_STOP, 0);
return err;
}
- return pcf8523_start_rtc(client);
+ return regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,
+ PCF8523_CONTROL1_STOP, 0);
}
static int pcf8523_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
{
- struct i2c_client *client = to_i2c_client(dev);
- u8 start = PCF8523_REG_MINUTE_ALARM, regs[4];
- struct i2c_msg msgs[2];
- u8 value;
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
+ u8 regs[4];
+ u32 value;
int err;
- msgs[0].addr = client->addr;
- msgs[0].flags = 0;
- msgs[0].len = 1;
- msgs[0].buf = &start;
-
- msgs[1].addr = client->addr;
- msgs[1].flags = I2C_M_RD;
- msgs[1].len = sizeof(regs);
- msgs[1].buf = regs;
-
- err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ err = regmap_bulk_read(pcf8523->regmap, PCF8523_REG_MINUTE_ALARM, regs,
+ sizeof(regs));
if (err < 0)
return err;
@@ -324,12 +176,12 @@ static int pcf8523_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
tm->time.tm_mday = bcd2bin(regs[2] & 0x3F);
tm->time.tm_wday = bcd2bin(regs[3] & 0x7);
- err = pcf8523_read(client, PCF8523_REG_CONTROL1, &value);
+ err = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL1, &value);
if (err < 0)
return err;
tm->enabled = !!(value & PCF8523_CONTROL1_AIE);
- err = pcf8523_read(client, PCF8523_REG_CONTROL2, &value);
+ err = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL2, &value);
if (err < 0)
return err;
tm->pending = !!(value & PCF8523_CONTROL2_AF);
@@ -339,30 +191,16 @@ static int pcf8523_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
static int pcf8523_irq_enable(struct device *dev, unsigned int enabled)
{
- struct i2c_client *client = to_i2c_client(dev);
- u8 value;
- int err;
-
- err = pcf8523_read(client, PCF8523_REG_CONTROL1, &value);
- if (err < 0)
- return err;
-
- value &= PCF8523_CONTROL1_AIE;
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
- if (enabled)
- value |= PCF8523_CONTROL1_AIE;
-
- err = pcf8523_write(client, PCF8523_REG_CONTROL1, value);
- if (err < 0)
- return err;
-
- return 0;
+ return regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,
+ PCF8523_CONTROL1_AIE, enabled ?
+ PCF8523_CONTROL1_AIE : 0);
}
static int pcf8523_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct i2c_msg msg;
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
u8 regs[5];
int err;
@@ -370,7 +208,7 @@ static int pcf8523_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
if (err)
return err;
- err = pcf8523_write(client, PCF8523_REG_CONTROL2, 0);
+ err = regmap_write(pcf8523->regmap, PCF8523_REG_CONTROL2, 0);
if (err < 0)
return err;
@@ -382,16 +220,13 @@ static int pcf8523_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
rtc_time64_to_tm(alarm_time, &tm->time);
}
- regs[0] = PCF8523_REG_MINUTE_ALARM;
- regs[1] = bin2bcd(tm->time.tm_min);
- regs[2] = bin2bcd(tm->time.tm_hour);
- regs[3] = bin2bcd(tm->time.tm_mday);
- regs[4] = ALARM_DIS;
- msg.addr = client->addr;
- msg.flags = 0;
- msg.len = sizeof(regs);
- msg.buf = regs;
- err = i2c_transfer(client->adapter, &msg, 1);
+ regs[0] = bin2bcd(tm->time.tm_min);
+ regs[1] = bin2bcd(tm->time.tm_hour);
+ regs[2] = bin2bcd(tm->time.tm_mday);
+ regs[3] = ALARM_DIS;
+
+ err = regmap_bulk_write(pcf8523->regmap, PCF8523_REG_MINUTE_ALARM, regs,
+ sizeof(regs));
if (err < 0)
return err;
@@ -401,24 +236,101 @@ static int pcf8523_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
return 0;
}
-#ifdef CONFIG_RTC_INTF_DEV
+static int pcf8523_param_get(struct device *dev, struct rtc_param *param)
+{
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
+ int ret;
+
+ switch(param->param) {
+ u32 value;
+
+ case RTC_PARAM_BACKUP_SWITCH_MODE:
+ ret = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL3, &value);
+ if (ret < 0)
+ return ret;
+
+ value = FIELD_GET(PCF8523_CONTROL3_PM, value);
+
+ switch(value) {
+ case 0x0:
+ case 0x4:
+ param->uvalue = RTC_BSM_LEVEL;
+ break;
+ case 0x1:
+ case 0x5:
+ param->uvalue = RTC_BSM_DIRECT;
+ break;
+ case PCF8523_PM_STANDBY:
+ param->uvalue = RTC_BSM_STANDBY;
+ break;
+ default:
+ param->uvalue = RTC_BSM_DISABLED;
+ }
+
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int pcf8523_param_set(struct device *dev, struct rtc_param *param)
+{
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
+
+ switch(param->param) {
+ u8 mode;
+ case RTC_PARAM_BACKUP_SWITCH_MODE:
+ switch (param->uvalue) {
+ case RTC_BSM_DISABLED:
+ mode = 0x2;
+ break;
+ case RTC_BSM_DIRECT:
+ mode = 0x1;
+ break;
+ case RTC_BSM_LEVEL:
+ mode = 0x0;
+ break;
+ case RTC_BSM_STANDBY:
+ mode = PCF8523_PM_STANDBY;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL3,
+ PCF8523_CONTROL3_PM,
+ FIELD_PREP(PCF8523_CONTROL3_PM, mode));
+
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd,
unsigned long arg)
{
- struct i2c_client *client = to_i2c_client(dev);
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
unsigned int flags = 0;
- u8 value;
+ u32 value;
int ret;
switch (cmd) {
case RTC_VL_READ:
- ret = pcf8523_voltage_low(client);
+ ret = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL3, &value);
if (ret < 0)
return ret;
- if (ret)
+
+ if (value & PCF8523_CONTROL3_BLF)
flags |= RTC_VL_BACKUP_LOW;
- ret = pcf8523_read(client, PCF8523_REG_SECONDS, &value);
+ ret = regmap_read(pcf8523->regmap, PCF8523_REG_SECONDS, &value);
if (ret < 0)
return ret;
@@ -431,18 +343,15 @@ static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd,
return -ENOIOCTLCMD;
}
}
-#else
-#define pcf8523_rtc_ioctl NULL
-#endif
static int pcf8523_rtc_read_offset(struct device *dev, long *offset)
{
- struct i2c_client *client = to_i2c_client(dev);
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
int err;
- u8 value;
+ u32 value;
s8 val;
- err = pcf8523_read(client, PCF8523_REG_OFFSET, &value);
+ err = regmap_read(pcf8523->regmap, PCF8523_REG_OFFSET, &value);
if (err < 0)
return err;
@@ -455,9 +364,9 @@ static int pcf8523_rtc_read_offset(struct device *dev, long *offset)
static int pcf8523_rtc_set_offset(struct device *dev, long offset)
{
- struct i2c_client *client = to_i2c_client(dev);
+ struct pcf8523 *pcf8523 = dev_get_drvdata(dev);
long reg_m0, reg_m1;
- u8 value;
+ u32 value;
reg_m0 = clamp(DIV_ROUND_CLOSEST(offset, 4340), -64L, 63L);
reg_m1 = clamp(DIV_ROUND_CLOSEST(offset, 4069), -64L, 63L);
@@ -467,7 +376,7 @@ static int pcf8523_rtc_set_offset(struct device *dev, long offset)
else
value = (reg_m1 & 0x7f) | PCF8523_OFFSET_MODE;
- return pcf8523_write(client, PCF8523_REG_OFFSET, value);
+ return regmap_write(pcf8523->regmap, PCF8523_REG_OFFSET, value);
}
static const struct rtc_class_ops pcf8523_rtc_ops = {
@@ -479,6 +388,14 @@ static const struct rtc_class_ops pcf8523_rtc_ops = {
.ioctl = pcf8523_rtc_ioctl,
.read_offset = pcf8523_rtc_read_offset,
.set_offset = pcf8523_rtc_set_offset,
+ .param_get = pcf8523_param_get,
+ .param_set = pcf8523_param_set,
+};
+
+static const struct regmap_config regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x13,
};
static int pcf8523_probe(struct i2c_client *client,
@@ -487,6 +404,7 @@ static int pcf8523_probe(struct i2c_client *client,
struct pcf8523 *pcf8523;
struct rtc_device *rtc;
bool wakeup_source = false;
+ u32 value;
int err;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
@@ -496,46 +414,60 @@ static int pcf8523_probe(struct i2c_client *client,
if (!pcf8523)
return -ENOMEM;
+ pcf8523->regmap = devm_regmap_init_i2c(client, &regmap_config);
+ if (IS_ERR(pcf8523->regmap))
+ return PTR_ERR(pcf8523->regmap);
+
i2c_set_clientdata(client, pcf8523);
- pcf8523->client = client;
- err = pcf8523_load_capacitance(client);
+ rtc = devm_rtc_allocate_device(&client->dev);
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+ pcf8523->rtc = rtc;
+
+ err = pcf8523_load_capacitance(pcf8523, client->dev.of_node);
if (err < 0)
dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
err);
- err = pcf8523_set_pm(client, 0);
+ err = regmap_read(pcf8523->regmap, PCF8523_REG_SECONDS, &value);
if (err < 0)
return err;
- rtc = devm_rtc_allocate_device(&client->dev);
- if (IS_ERR(rtc))
- return PTR_ERR(rtc);
+ if (value & PCF8523_SECONDS_OS) {
+ err = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL3, &value);
+ if (err < 0)
+ return err;
+
+ if (FIELD_GET(PCF8523_CONTROL3_PM, value) == PCF8523_PM_STANDBY) {
+ err = regmap_write(pcf8523->regmap, PCF8523_REG_CONTROL3,
+ value & ~PCF8523_CONTROL3_PM);
+ if (err < 0)
+ return err;
+ }
+ }
- pcf8523->rtc = rtc;
rtc->ops = &pcf8523_rtc_ops;
rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
rtc->range_max = RTC_TIMESTAMP_END_2099;
rtc->uie_unsupported = 1;
if (client->irq > 0) {
- err = pcf8523_write(client, PCF8523_TMR_CLKOUT_CTRL, 0x38);
+ err = regmap_write(pcf8523->regmap, PCF8523_TMR_CLKOUT_CTRL, 0x38);
if (err < 0)
return err;
err = devm_request_threaded_irq(&client->dev, client->irq,
NULL, pcf8523_irq,
IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_LOW,
- dev_name(&rtc->dev), client);
+ dev_name(&rtc->dev), pcf8523);
if (err)
return err;
dev_pm_set_wake_irq(&client->dev, client->irq);
}
-#ifdef CONFIG_OF
wakeup_source = of_property_read_bool(client->dev.of_node, "wakeup-source");
-#endif
if (client->irq > 0 || wakeup_source)
device_init_wakeup(&client->dev, true);
@@ -548,19 +480,17 @@ static const struct i2c_device_id pcf8523_id[] = {
};
MODULE_DEVICE_TABLE(i2c, pcf8523_id);
-#ifdef CONFIG_OF
static const struct of_device_id pcf8523_of_match[] = {
{ .compatible = "nxp,pcf8523" },
{ .compatible = "microcrystal,rv8523" },
{ }
};
MODULE_DEVICE_TABLE(of, pcf8523_of_match);
-#endif
static struct i2c_driver pcf8523_driver = {
.driver = {
.name = "rtc-pcf8523",
- .of_match_table = of_match_ptr(pcf8523_of_match),
+ .of_match_table = pcf8523_of_match,
},
.probe = pcf8523_probe,
.id_table = pcf8523_id,
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