linux-kernel - [PATCH] hwmon: (pmbus) Add driver for STMicroelectronics PM6764 Voltage Regulator

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Date:   Wed, 4 Nov 2020 15:09:23 +0800
From:   Yungteng Hsu <hsu.yungteng@...il.com>
To:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org
Cc:     Yungteng Hsu <hsu.yungteng@...il.com>, alan@...hat.com
Subject: [PATCH] hwmon: (pmbus) 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@...il.com>
---
 drivers/hwmon/pmbus/Kconfig    |  8 ++++
 drivers/hwmon/pmbus/Makefile   |  1 +
 drivers/hwmon/pmbus/pm6764tr.c | 74 ++++++++++++++++++++++++++++++++++
 3 files changed, 83 insertions(+)
 create mode 100644 drivers/hwmon/pmbus/pm6764tr.c

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index a25faf69fce3..2b487c401a4e 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -220,6 +220,14 @@ config SENSORS_MP2975
   This driver can also be built as a module. If so, the module will
   be called mp2975.

+config SENSORS_PM6764TR
+ tristate "PM6764TR"
+ help
+  If you say yes here you get hardware monitoring support for PM6764TR.
+
+  This driver can also be built as a module. If so, the module will
+  be called pm6764tr.
+
 config SENSORS_PXE1610
  tristate "Infineon PXE1610"
  help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 4c97ad0bd791..31ebdef5d4a6 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
 obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
 obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
 obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
+obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o
 obj-$(CONFIG_SENSORS_PXE1610) += pxe1610.o
 obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
 obj-$(CONFIG_SENSORS_TPS53679) += tps53679.o
diff --git a/drivers/hwmon/pmbus/pm6764tr.c b/drivers/hwmon/pmbus/pm6764tr.c
new file mode 100644
index 000000000000..b125a1cbfea5
--- /dev/null
+++ b/drivers/hwmon/pmbus/pm6764tr.c
@@ -0,0 +1,74 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/i2c.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 reg)
+{
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_VMON:
+ ret = pmbus_read_word_data(client, page,
+   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,
+  const struct i2c_device_id *id)
+{
+ return pmbus_do_probe(client, id, &pm6764tr_info);
+}
+
+static const struct i2c_device_id pm6764tr_id[] = {
+ {"pm6764tr", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, pm6764tr_id);
+
+static const struct of_device_id pm6764tr_of_match[] = {
+ {.compatible = "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 = pm6764tr_probe,
+ .remove = pmbus_do_remove,
+ .id_table = pm6764tr_id,
+};
+
+module_i2c_driver(pm6764tr_driver);
+
+MODULE_AUTHOR("Charles Hsu");
+MODULE_DESCRIPTION("PMBus driver for  ST PM6764TR");
+MODULE_LICENSE("GPL");
--
2.25.1