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Commit e6e38082 authored by Mylène Josserand's avatar Mylène Josserand Committed by Alexandre Belloni
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rtc: rv3029: convert to use regmap 

To add support of rv3049, the current driver is converted to use regmap.
Signed-off-by: default avatarMylène Josserand <mylene.josserand@free-electrons.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 4e7f1a60
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Showing with 142 additions and 133 deletions
drivers/rtc/rtc-rv3029c2.c
View file @ e6e38082
......@@ -20,7 +20,7 @@
#include <linux/of.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/regmap.h>
/* Register map */
/* control section */
......@@ -116,81 +116,84 @@
#define RV3029_USR2_RAM_PAGE 0x3C
#define RV3029_USR2_SECTION_LEN 0x04
static int rv3029_read_regs(struct i2c_client *client, u8 reg, u8 *buf,
struct rv3029_data {
struct device *dev;
struct rtc_device *rtc;
struct regmap *regmap;
int irq;
};
static int rv3029_read_regs(struct device *dev, u8 reg, u8 *buf,
unsigned len)
{
int ret;
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
if ((reg > RV3029_USR1_RAM_PAGE + 7) ||
(reg + len > RV3029_USR1_RAM_PAGE + 8))
return -EINVAL;
ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);
if (ret < 0)
return ret;
if (ret < len)
return -EIO;
return 0;
return regmap_bulk_read(rv3029->regmap, reg, buf, len);
}
static int rv3029_write_regs(struct i2c_client *client, u8 reg, u8 const buf[],
static int rv3029_write_regs(struct device *dev, u8 reg, u8 const buf[],
unsigned len)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
if ((reg > RV3029_USR1_RAM_PAGE + 7) ||
(reg + len > RV3029_USR1_RAM_PAGE + 8))
return -EINVAL;
return i2c_smbus_write_i2c_block_data(client, reg, len, buf);
return regmap_bulk_write(rv3029->regmap, reg, buf, len);
}
static int rv3029_update_bits(struct i2c_client *client, u8 reg, u8 mask,
u8 set)
static int rv3029_update_bits(struct device *dev, u8 reg, u8 mask, u8 set)
{
u8 buf;
int ret;
ret = rv3029_read_regs(client, reg, &buf, 1);
ret = rv3029_read_regs(dev, reg, &buf, 1);
if (ret < 0)
return ret;
buf &= ~mask;
buf |= set & mask;
ret = rv3029_write_regs(client, reg, &buf, 1);
ret = rv3029_write_regs(dev, reg, &buf, 1);
if (ret < 0)
return ret;
return 0;
}
static int rv3029_get_sr(struct i2c_client *client, u8 *buf)
static int rv3029_get_sr(struct device *dev, u8 *buf)
{
int ret = rv3029_read_regs(client, RV3029_STATUS, buf, 1);
int ret = rv3029_read_regs(dev, RV3029_STATUS, buf, 1);
if (ret < 0)
return -EIO;
dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
return 0;
}
static int rv3029_set_sr(struct i2c_client *client, u8 val)
static int rv3029_set_sr(struct device *dev, u8 val)
{
u8 buf[1];
int sr;
buf[0] = val;
sr = rv3029_write_regs(client, RV3029_STATUS, buf, 1);
dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
sr = rv3029_write_regs(dev, RV3029_STATUS, buf, 1);
dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
if (sr < 0)
return -EIO;
return 0;
}
static int rv3029_eeprom_busywait(struct i2c_client *client)
static int rv3029_eeprom_busywait(struct device *dev)
{
int i, ret;
u8 sr;
for (i = 100; i > 0; i--) {
ret = rv3029_get_sr(client, &sr);
ret = rv3029_get_sr(dev, &sr);
if (ret < 0)
break;
if (!(sr & RV3029_STATUS_EEBUSY))
......@@ -198,28 +201,28 @@ static int rv3029_eeprom_busywait(struct i2c_client *client)
usleep_range(1000, 10000);
}
if (i <= 0) {
dev_err(&client->dev, "EEPROM busy wait timeout.\n");
dev_err(dev, "EEPROM busy wait timeout.\n");
return -ETIMEDOUT;
}
return ret;
}
static int rv3029_eeprom_exit(struct i2c_client *client)
static int rv3029_eeprom_exit(struct device *dev)
{
/* Re-enable eeprom refresh */
return rv3029_update_bits(client, RV3029_ONOFF_CTRL,
return rv3029_update_bits(dev, RV3029_ONOFF_CTRL,
RV3029_ONOFF_CTRL_EERE,
RV3029_ONOFF_CTRL_EERE);
}
static int rv3029_eeprom_enter(struct i2c_client *client)
static int rv3029_eeprom_enter(struct device *dev)
{
int ret;
u8 sr;
/* Check whether we are in the allowed voltage range. */
ret = rv3029_get_sr(client, &sr);
ret = rv3029_get_sr(dev, &sr);
if (ret < 0)
return ret;
if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
......@@ -228,119 +231,118 @@ static int rv3029_eeprom_enter(struct i2c_client *client)
*/
sr &= ~RV3029_STATUS_VLOW1;
sr &= ~RV3029_STATUS_VLOW2;
ret = rv3029_set_sr(client, sr);
ret = rv3029_set_sr(dev, sr);
if (ret < 0)
return ret;
usleep_range(1000, 10000);
ret = rv3029_get_sr(client, &sr);
ret = rv3029_get_sr(dev, &sr);
if (ret < 0)
return ret;
if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
dev_err(&client->dev,
dev_err(dev,
"Supply voltage is too low to safely access the EEPROM.\n");
return -ENODEV;
}
}
/* Disable eeprom refresh. */
ret = rv3029_update_bits(client, RV3029_ONOFF_CTRL,
RV3029_ONOFF_CTRL_EERE, 0);
ret = rv3029_update_bits(dev, RV3029_ONOFF_CTRL, RV3029_ONOFF_CTRL_EERE,
0);
if (ret < 0)
return ret;
/* Wait for any previous eeprom accesses to finish. */
ret = rv3029_eeprom_busywait(client);
ret = rv3029_eeprom_busywait(dev);
if (ret < 0)
rv3029_eeprom_exit(client);
rv3029_eeprom_exit(dev);
return ret;
}
static int rv3029_eeprom_read(struct i2c_client *client, u8 reg,
static int rv3029_eeprom_read(struct device *dev, u8 reg,
u8 buf[], size_t len)
{
int ret, err;
err = rv3029_eeprom_enter(client);
err = rv3029_eeprom_enter(dev);
if (err < 0)
return err;
ret = rv3029_read_regs(client, reg, buf, len);
ret = rv3029_read_regs(dev, reg, buf, len);
err = rv3029_eeprom_exit(client);
err = rv3029_eeprom_exit(dev);
if (err < 0)
return err;
return ret;
}
static int rv3029_eeprom_write(struct i2c_client *client, u8 reg,
static int rv3029_eeprom_write(struct device *dev, u8 reg,
u8 const buf[], size_t len)
{
int ret, err;
size_t i;
u8 tmp;
err = rv3029_eeprom_enter(client);
err = rv3029_eeprom_enter(dev);
if (err < 0)
return err;
for (i = 0; i < len; i++, reg++) {
ret = rv3029_read_regs(client, reg, &tmp, 1);
ret = rv3029_read_regs(dev, reg, &tmp, 1);
if (ret < 0)
break;
if (tmp != buf[i]) {
ret = rv3029_write_regs(client, reg, &buf[i], 1);
ret = rv3029_write_regs(dev, reg, &buf[i], 1);
if (ret < 0)
break;
}
ret = rv3029_eeprom_busywait(client);
ret = rv3029_eeprom_busywait(dev);
if (ret < 0)
break;
}
err = rv3029_eeprom_exit(client);
err = rv3029_eeprom_exit(dev);
if (err < 0)
return err;
return ret;
}
static int rv3029_eeprom_update_bits(struct i2c_client *client,
static int rv3029_eeprom_update_bits(struct device *dev,
u8 reg, u8 mask, u8 set)
{
u8 buf;
int ret;
ret = rv3029_eeprom_read(client, reg, &buf, 1);
ret = rv3029_eeprom_read(dev, reg, &buf, 1);
if (ret < 0)
return ret;
buf &= ~mask;
buf |= set & mask;
ret = rv3029_eeprom_write(client, reg, &buf, 1);
ret = rv3029_eeprom_write(dev, reg, &buf, 1);
if (ret < 0)
return ret;
return 0;
}
static int rv3029_read_time(struct i2c_client *client, struct rtc_time *tm)
static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
{
u8 buf[1];
int ret;
u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };
ret = rv3029_get_sr(client, buf);
ret = rv3029_get_sr(dev, buf);
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
dev_err(dev, "%s: reading SR failed\n", __func__);
return -EIO;
}
ret = rv3029_read_regs(client, RV3029_W_SEC, regs,
ret = rv3029_read_regs(dev, RV3029_W_SEC, regs,
RV3029_WATCH_SECTION_LEN);
if (ret < 0) {
dev_err(&client->dev, "%s: reading RTC section failed\n",
__func__);
dev_err(dev, "%s: reading RTC section failed\n", __func__);
return ret;
}
......@@ -368,30 +370,23 @@ static int rv3029_read_time(struct i2c_client *client, struct rtc_time *tm)
return 0;
}
static int rv3029_rtc_read_time(struct device *dev, struct rtc_time *tm)
static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
return rv3029_read_time(to_i2c_client(dev), tm);
}
static int rv3029_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct i2c_client *client = to_i2c_client(dev);
struct rtc_time *const tm = &alarm->time;
int ret;
u8 regs[8];
ret = rv3029_get_sr(client, regs);
ret = rv3029_get_sr(dev, regs);
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
dev_err(dev, "%s: reading SR failed\n", __func__);
return -EIO;
}
ret = rv3029_read_regs(client, RV3029_A_SC, regs,
ret = rv3029_read_regs(dev, RV3029_A_SC, regs,
RV3029_ALARM_SECTION_LEN);
if (ret < 0) {
dev_err(&client->dev, "%s: reading alarm section failed\n",
__func__);
dev_err(dev, "%s: reading alarm section failed\n", __func__);
return ret;
}
......@@ -406,25 +401,23 @@ static int rv3029_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
return 0;
}
static int rv3029_rtc_alarm_set_irq(struct i2c_client *client, int enable)
static int rv3029_rtc_alarm_set_irq(struct device *dev, int enable)
{
int ret;
/* enable/disable AIE irq */
ret = rv3029_update_bits(client, RV3029_IRQ_CTRL,
RV3029_IRQ_CTRL_AIE,
ret = rv3029_update_bits(dev, RV3029_IRQ_CTRL, RV3029_IRQ_CTRL_AIE,
(enable ? RV3029_IRQ_CTRL_AIE : 0));
if (ret < 0) {
dev_err(&client->dev, "can't update INT reg\n");
dev_err(dev, "can't update INT reg\n");
return ret;
}
return 0;
}
static int rv3029_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct i2c_client *client = to_i2c_client(dev);
struct rtc_time *const tm = &alarm->time;
int ret;
u8 regs[8];
......@@ -437,9 +430,9 @@ static int rv3029_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
if (tm->tm_year < 100)
return -EINVAL;
ret = rv3029_get_sr(client, regs);
ret = rv3029_get_sr(dev, regs);
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
dev_err(dev, "%s: reading SR failed\n", __func__);
return -EIO;
}
regs[RV3029_A_SC-RV3029_A_SC] = bin2bcd(tm->tm_sec & 0x7f);
......@@ -450,38 +443,38 @@ static int rv3029_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
regs[RV3029_A_DW-RV3029_A_SC] = bin2bcd((tm->tm_wday & 7) - 1);
regs[RV3029_A_YR-RV3029_A_SC] = bin2bcd((tm->tm_year & 0x7f) - 100);
ret = rv3029_write_regs(client, RV3029_A_SC, regs,
ret = rv3029_write_regs(dev, RV3029_A_SC, regs,
RV3029_ALARM_SECTION_LEN);
if (ret < 0)
return ret;
if (alarm->enabled) {
/* clear AF flag */
ret = rv3029_update_bits(client, RV3029_IRQ_FLAGS,
ret = rv3029_update_bits(dev, RV3029_IRQ_FLAGS,
RV3029_IRQ_FLAGS_AF, 0);
if (ret < 0) {
dev_err(&client->dev, "can't clear alarm flag\n");
dev_err(dev, "can't clear alarm flag\n");
return ret;
}
/* enable AIE irq */
ret = rv3029_rtc_alarm_set_irq(client, 1);
ret = rv3029_rtc_alarm_set_irq(dev, 1);
if (ret)
return ret;
dev_dbg(&client->dev, "alarm IRQ armed\n");
dev_dbg(dev, "alarm IRQ armed\n");
} else {
/* disable AIE irq */
ret = rv3029_rtc_alarm_set_irq(client, 0);
ret = rv3029_rtc_alarm_set_irq(dev, 0);
if (ret)
return ret;
dev_dbg(&client->dev, "alarm IRQ disabled\n");
dev_dbg(dev, "alarm IRQ disabled\n");
}
return 0;
}
static int rv3029_set_time(struct i2c_client *client, struct rtc_time const *tm)
static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
{
u8 regs[8];
int ret;
......@@ -502,31 +495,25 @@ static int rv3029_set_time(struct i2c_client *client, struct rtc_time const *tm)
regs[RV3029_W_DAYS-RV3029_W_SEC] = bin2bcd((tm->tm_wday & 7)+1);
regs[RV3029_W_YEARS-RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);
ret = rv3029_write_regs(client, RV3029_W_SEC, regs,
ret = rv3029_write_regs(dev, RV3029_W_SEC, regs,
RV3029_WATCH_SECTION_LEN);
if (ret < 0)
return ret;
ret = rv3029_get_sr(client, regs);
ret = rv3029_get_sr(dev, regs);
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
dev_err(dev, "%s: reading SR failed\n", __func__);
return ret;
}
/* clear PON bit */
ret = rv3029_set_sr(client, (regs[0] & ~RV3029_STATUS_PON));
ret = rv3029_set_sr(dev, (regs[0] & ~RV3029_STATUS_PON));
if (ret < 0) {
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
dev_err(dev, "%s: reading SR failed\n", __func__);
return ret;
}
return 0;
}
static int rv3029_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
return rv3029_set_time(to_i2c_client(dev), tm);
}
static const struct rv3029_trickle_tab_elem {
u32 r; /* resistance in ohms */
u8 conf; /* trickle config bits */
......@@ -584,9 +571,9 @@ static const struct rv3029_trickle_tab_elem {
},
};
static void rv3029_trickle_config(struct i2c_client *client)
static void rv3029_trickle_config(struct device *dev)
{
struct device_node *of_node = client->dev.of_node;
struct device_node *of_node = dev->of_node;
const struct rv3029_trickle_tab_elem *elem;
int i, err;
u32 ohms;
......@@ -608,27 +595,26 @@ static void rv3029_trickle_config(struct i2c_client *client)
break;
}
trickle_set_bits = elem->conf;
dev_info(&client->dev,
dev_info(dev,
"Trickle charger enabled at %d ohms resistance.\n",
elem->r);
}
err = rv3029_eeprom_update_bits(client, RV3029_CONTROL_E2P_EECTRL,
err = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL,
RV3029_TRICKLE_MASK,
trickle_set_bits);
if (err < 0) {
dev_err(&client->dev,
"Failed to update trickle charger config\n");
dev_err(dev, "Failed to update trickle charger config\n");
}
}
#ifdef CONFIG_RTC_DRV_RV3029_HWMON
static int rv3029_read_temp(struct i2c_client *client, int *temp_mC)
static int rv3029_read_temp(struct device *dev, int *temp_mC)
{
int ret;
u8 temp;
ret = rv3029_read_regs(client, RV3029_TEMP_PAGE, &temp, 1);
ret = rv3029_read_regs(dev, RV3029_TEMP_PAGE, &temp, 1);
if (ret < 0)
return ret;
......@@ -641,10 +627,9 @@ static ssize_t rv3029_hwmon_show_temp(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = dev_get_drvdata(dev);
int ret, temp_mC;
ret = rv3029_read_temp(client, &temp_mC);
ret = rv3029_read_temp(dev, &temp_mC);
if (ret < 0)
return ret;
......@@ -656,7 +641,6 @@ static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
const char *buf,
size_t count)
{
struct i2c_client *client = dev_get_drvdata(dev);
unsigned long interval_ms;
int ret;
u8 th_set_bits = 0;
......@@ -670,7 +654,7 @@ static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
if (interval_ms >= 16000)
th_set_bits |= RV3029_EECTRL_THP;
}
ret = rv3029_eeprom_update_bits(client, RV3029_CONTROL_E2P_EECTRL,
ret = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL,
RV3029_EECTRL_THE | RV3029_EECTRL_THP,
th_set_bits);
if (ret < 0)
......@@ -683,11 +667,10 @@ static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = dev_get_drvdata(dev);
int ret, interval_ms;
u8 eectrl;
ret = rv3029_eeprom_read(client, RV3029_CONTROL_E2P_EECTRL,
ret = rv3029_eeprom_read(dev, RV3029_CONTROL_E2P_EECTRL,
&eectrl, 1);
if (ret < 0)
return ret;
......@@ -717,32 +700,32 @@ static struct attribute *rv3029_hwmon_attrs[] = {
};
ATTRIBUTE_GROUPS(rv3029_hwmon);
static void rv3029_hwmon_register(struct i2c_client *client)
static void rv3029_hwmon_register(struct device *dev, const char *name)
{
struct rv3029_data *rv3029 = dev_get_drvdata(dev);
struct device *hwmon_dev;
hwmon_dev = devm_hwmon_device_register_with_groups(
&client->dev, client->name, client, rv3029_hwmon_groups);
hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,
rv3029_hwmon_groups);
if (IS_ERR(hwmon_dev)) {
dev_warn(&client->dev,
"unable to register hwmon device %ld\n",
dev_warn(dev, "unable to register hwmon device %ld\n",
PTR_ERR(hwmon_dev));
}
}
#else /* CONFIG_RTC_DRV_RV3029_HWMON */
static void rv3029_hwmon_register(struct i2c_client *client)
static void rv3029_hwmon_register(struct device *dev, const char *name)
{
}
#endif /* CONFIG_RTC_DRV_RV3029_HWMON */
static const struct rtc_class_ops rv3029_rtc_ops = {
.read_time = rv3029_rtc_read_time,
.set_time = rv3029_rtc_set_time,
.read_alarm = rv3029_rtc_read_alarm,
.set_alarm = rv3029_rtc_set_alarm,
.read_time = rv3029_read_time,
.set_time = rv3029_set_time,
.read_alarm = rv3029_read_alarm,
.set_alarm = rv3029_set_alarm,
};
static struct i2c_device_id rv3029_id[] = {
......@@ -752,41 +735,67 @@ static struct i2c_device_id rv3029_id[] = {
};
MODULE_DEVICE_TABLE(i2c, rv3029_id);
static int rv3029_probe(struct i2c_client *client,
const struct i2c_device_id *id)
static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
const char *name)
{
struct rtc_device *rtc;
struct rv3029_data *rv3029;
int rc = 0;
u8 buf[1];
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_EMUL))
return -ENODEV;
rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
if (!rv3029)
return -ENOMEM;
rv3029->regmap = regmap;
rv3029->irq = irq;
rv3029->dev = dev;
dev_set_drvdata(dev, rv3029);
rc = rv3029_get_sr(client, buf);
rc = rv3029_get_sr(dev, buf);
if (rc < 0) {
dev_err(&client->dev, "reading status failed\n");
dev_err(dev, "reading status failed\n");
return rc;
}
rv3029_trickle_config(client);
rv3029_hwmon_register(client);
rv3029_trickle_config(dev);
rv3029_hwmon_register(dev, name);
rv3029->rtc = devm_rtc_device_register(dev, name, &rv3029_rtc_ops,
THIS_MODULE);
rtc = devm_rtc_device_register(&client->dev, client->name,
&rv3029_rtc_ops, THIS_MODULE);
return PTR_ERR_OR_ZERO(rv3029->rtc);
}
if (IS_ERR(rtc))
return PTR_ERR(rtc);
static int rv3029_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_SMBUS_I2C_BLOCK |
I2C_FUNC_SMBUS_BYTE)) {
dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");
return -ENODEV;
}
i2c_set_clientdata(client, rtc);
regmap = devm_regmap_init_i2c(client, &config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
__func__, PTR_ERR(regmap));
return PTR_ERR(regmap);
}
return 0;
return rv3029_probe(&client->dev, regmap, client->irq, client->name);
}
static struct i2c_driver rv3029_driver = {
.driver = {
.name = "rtc-rv3029c2",
},
.probe = rv3029_probe,
.probe = rv3029_i2c_probe,
.id_table = rv3029_id,
};
......
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