From: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@xxxxxxx>
- regmap subsystem provides multiple benefits over direct smbus APIs
- The susbsytem can be helpful in following cases
- Differnet types of bus (i2c/i3c)
- Different Register address size (1byte/2byte)
Signed-off-by: Akshay Gupta <Akshay.Gupta@xxxxxxx>
Signed-off-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@xxxxxxx>
---
drivers/hwmon/Kconfig | 1 +
drivers/hwmon/sbrmi.c | 61 ++++++++++++++++++++++++-------------------
2 files changed, 35 insertions(+), 27 deletions(-)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index a608264da87d..903a8ebbd2d7 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1759,6 +1759,7 @@ config SENSORS_SBTSI
config SENSORS_SBRMI
tristate "Emulated SB-RMI sensor"
depends on I2C
+ select REGMAP_I2C
help
If you say yes here you get support for emulated RMI
sensors on AMD SoCs with APML interface connected to a BMC device.
diff --git a/drivers/hwmon/sbrmi.c b/drivers/hwmon/sbrmi.c
index 484703f0ea5f..901bd82d71d4 100644
--- a/drivers/hwmon/sbrmi.c
+++ b/drivers/hwmon/sbrmi.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
+#include <linux/regmap.h>
/* Do not allow setting negative power limit */
#define SBRMI_PWR_MIN 0
@@ -63,6 +64,7 @@ enum sbrmi_reg {
struct sbrmi_data {
struct i2c_client *client;
struct mutex lock;
+ struct regmap *regmap;
u32 pwr_limit_max;
};
@@ -73,22 +75,21 @@ struct sbrmi_mailbox_msg {
u32 data_out;
};
-static int sbrmi_enable_alert(struct i2c_client *client)
+static int sbrmi_enable_alert(struct sbrmi_data *data)
{
- int ctrl;
+ int ctrl, ret = 0;
/*
* Enable the SB-RMI Software alert status
* by writing 0 to bit 4 of Control register(0x1)
*/
- ctrl = i2c_smbus_read_byte_data(client, SBRMI_CTRL);
- if (ctrl < 0)
- return ctrl;
+ ret = regmap_read(data->regmap, SBRMI_STATUS, &ctrl);
+ if (ret < 0)
+ return ret;
if (ctrl & 0x10) {
ctrl &= ~0x10;
- return i2c_smbus_write_byte_data(client,
- SBRMI_CTRL, ctrl);
+ return regmap_write(data->regmap, SBRMI_CTRL, ctrl);
}
return 0;
@@ -97,6 +98,7 @@ static int sbrmi_enable_alert(struct i2c_client *client)
static int rmi_mailbox_xfer(struct sbrmi_data *data,
struct sbrmi_mailbox_msg *msg)
{
+ unsigned int bytes = 0;
int i, ret, retry = 10;
int sw_status;
u8 byte;
@@ -104,14 +106,12 @@ static int rmi_mailbox_xfer(struct sbrmi_data *data,
mutex_lock(&data->lock);
/* Indicate firmware a command is to be serviced */
- ret = i2c_smbus_write_byte_data(data->client,
- SBRMI_INBNDMSG7, START_CMD);
+ ret = regmap_write(data->regmap, SBRMI_INBNDMSG7, START_CMD);
if (ret < 0)
goto exit_unlock;
/* Write the command to SBRMI::InBndMsg_inst0 */
- ret = i2c_smbus_write_byte_data(data->client,
- SBRMI_INBNDMSG0, msg->cmd);
+ ret = regmap_write(data->regmap, SBRMI_INBNDMSG0, msg->cmd);
if (ret < 0)
goto exit_unlock;
@@ -122,8 +122,7 @@ static int rmi_mailbox_xfer(struct sbrmi_data *data,
*/
for (i = 0; i < 4; i++) {
byte = (msg->data_in >> i * 8) & 0xff;
- ret = i2c_smbus_write_byte_data(data->client,
- SBRMI_INBNDMSG1 + i, byte);
+ ret = regmap_write(data->regmap, SBRMI_INBNDMSG1 + i, byte);
if (ret < 0)
goto exit_unlock;
}
@@ -132,8 +131,7 @@ static int rmi_mailbox_xfer(struct sbrmi_data *data,
* Write 0x01 to SBRMI::SoftwareInterrupt to notify firmware to
* perform the requested read or write command
*/
- ret = i2c_smbus_write_byte_data(data->client,
- SBRMI_SW_INTERRUPT, TRIGGER_MAILBOX);
+ ret = regmap_write(data->regmap, SBRMI_SW_INTERRUPT, TRIGGER_MAILBOX);
if (ret < 0)
goto exit_unlock;
@@ -143,8 +141,7 @@ static int rmi_mailbox_xfer(struct sbrmi_data *data,
* of the requested command
*/
do {
- sw_status = i2c_smbus_read_byte_data(data->client,
- SBRMI_STATUS);
+ ret = regmap_read(data->regmap, SBRMI_STATUS, &sw_status);
if (sw_status < 0) {
ret = sw_status;
goto exit_unlock;
@@ -168,11 +165,11 @@ static int rmi_mailbox_xfer(struct sbrmi_data *data,
*/
if (msg->read) {
for (i = 0; i < 4; i++) {
- ret = i2c_smbus_read_byte_data(data->client,
- SBRMI_OUTBNDMSG1 + i);
+ ret = regmap_read(data->regmap,
+ SBRMI_OUTBNDMSG1 + i, &bytes);
if (ret < 0)
goto exit_unlock;
- msg->data_out |= ret << i * 8;
+ msg->data_out |= bytes << i * 8;
}
}
@@ -180,9 +177,8 @@ static int rmi_mailbox_xfer(struct sbrmi_data *data,
* BMC must write 1'b1 to SBRMI::Status[SwAlertSts] to clear the
* ALERT to initiator
*/
- ret = i2c_smbus_write_byte_data(data->client, SBRMI_STATUS,
- sw_status | SW_ALERT_MASK);
-
+ ret = regmap_write(data->regmap, SBRMI_STATUS,
+ sw_status | SW_ALERT_MASK);
exit_unlock:
mutex_unlock(&data->lock);
return ret;
@@ -265,7 +261,7 @@ static umode_t sbrmi_is_visible(const void *data,
return 0;
}
-static const struct hwmon_channel_info * const sbrmi_info[] = {
+static const struct hwmon_channel_info *sbrmi_info[] = {
HWMON_CHANNEL_INFO(power,
HWMON_P_INPUT | HWMON_P_CAP | HWMON_P_CAP_MAX),
NULL
@@ -302,6 +298,10 @@ static int sbrmi_probe(struct i2c_client *client)
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct sbrmi_data *data;
+ struct regmap_config sbrmi_i2c_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ };
int ret;
data = devm_kzalloc(dev, sizeof(struct sbrmi_data), GFP_KERNEL);
@@ -310,9 +310,12 @@ static int sbrmi_probe(struct i2c_client *client)
data->client = client;
mutex_init(&data->lock);
+ data->regmap = devm_regmap_init_i2c(client, &sbrmi_i2c_regmap_config);
+ if (IS_ERR(data->regmap))
+ return PTR_ERR(data->regmap);
/* Enable alert for SB-RMI sequence */
- ret = sbrmi_enable_alert(client);
+ ret = sbrmi_enable_alert(data);
if (ret < 0)
return ret;
@@ -321,8 +324,12 @@ static int sbrmi_probe(struct i2c_client *client)
if (ret < 0)
return ret;
- hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
- &sbrmi_chip_info, NULL);
+ dev_set_drvdata(dev, (void *)data);
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+ data,
+ &sbrmi_chip_info,
+ NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
--
2.25.1
