hwmon: Add driver for STMicroelectronics PM6764 Voltage Regulator

Add the pmbus driver for the STMicroelectronics pm6764 voltage regulator.

the output voltage use the MFR_READ_VOUT 0xD4
vout value returned is linear11

Signed-off-by: Charles Hsu <hsu.yungteng@gmail.com>
[groeck: Fixed various compile errors; marked pm6764tr_of_match __maybe_unused]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 75 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/pm6764tr.c b/drivers/hwmon/pmbus/pm6764tr.c
new file mode 100644
index 000000000000..d97cb6d6c87f
--- /dev/null
+++ b/drivers/hwmon/pmbus/pm6764tr.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for STMicroelectronics digital controller PM6764TR
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+#include "pmbus.h"
+
+#define PM6764TR_PMBUS_READ_VOUT	0xD4
+
+static int pm6764tr_read_word_data(struct i2c_client *client, int page, int phase, int reg)
+{
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VMON:
+		ret = pmbus_read_word_data(client, page, phase, PM6764TR_PMBUS_READ_VOUT);
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static struct pmbus_driver_info pm6764tr_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = linear,
+	.format[PSC_VOLTAGE_OUT] = vid,
+	.format[PSC_TEMPERATURE] = linear,
+	.format[PSC_CURRENT_OUT] = linear,
+	.format[PSC_POWER] = linear,
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |  PMBUS_HAVE_PIN |
+	    PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | PMBUS_HAVE_VMON |
+		PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_VOUT |
+		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+	.read_word_data = pm6764tr_read_word_data,
+};
+
+static int pm6764tr_probe(struct i2c_client *client)
+{
+	return pmbus_do_probe(client, &pm6764tr_info);
+}
+
+static const struct i2c_device_id pm6764tr_id[] = {
+	{"pm6764tr", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, pm6764tr_id);
+
+static const struct of_device_id __maybe_unused pm6764tr_of_match[] = {
+	{.compatible = "st,pm6764tr"},
+	{}
+};
+
+/* This is the driver that will be inserted */
+static struct i2c_driver pm6764tr_driver = {
+	.driver = {
+		   .name = "pm6764tr",
+		   .of_match_table = of_match_ptr(pm6764tr_of_match),
+		   },
+	.probe_new = pm6764tr_probe,
+	.id_table = pm6764tr_id,
+};
+
+module_i2c_driver(pm6764tr_driver);
+
+MODULE_AUTHOR("Charles Hsu");
+MODULE_DESCRIPTION("PMBus driver for  ST PM6764TR");
+MODULE_LICENSE("GPL");