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path: root/drivers/hwmon/pmbus/mpq8785.c
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Diffstat (limited to 'drivers/hwmon/pmbus/mpq8785.c')
-rw-r--r--drivers/hwmon/pmbus/mpq8785.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/mpq8785.c b/drivers/hwmon/pmbus/mpq8785.c
new file mode 100644
index 0000000000..4e2549cc81
--- /dev/null
+++ b/drivers/hwmon/pmbus/mpq8785.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for MPS MPQ8785 Step-Down Converter
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include "pmbus.h"
+
+static int mpq8785_identify(struct i2c_client *client,
+ struct pmbus_driver_info *info)
+{
+ int vout_mode;
+
+ vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
+ if (vout_mode < 0 || vout_mode == 0xff)
+ return vout_mode < 0 ? vout_mode : -ENODEV;
+ switch (vout_mode >> 5) {
+ case 0:
+ info->format[PSC_VOLTAGE_OUT] = linear;
+ break;
+ case 1:
+ case 2:
+ info->format[PSC_VOLTAGE_OUT] = direct,
+ info->m[PSC_VOLTAGE_OUT] = 64;
+ info->b[PSC_VOLTAGE_OUT] = 0;
+ info->R[PSC_VOLTAGE_OUT] = 1;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ return 0;
+};
+
+static struct pmbus_driver_info mpq8785_info = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_IN] = direct,
+ .format[PSC_CURRENT_OUT] = direct,
+ .format[PSC_TEMPERATURE] = direct,
+ .m[PSC_VOLTAGE_IN] = 4,
+ .b[PSC_VOLTAGE_IN] = 0,
+ .R[PSC_VOLTAGE_IN] = 1,
+ .m[PSC_CURRENT_OUT] = 16,
+ .b[PSC_CURRENT_OUT] = 0,
+ .R[PSC_CURRENT_OUT] = 0,
+ .m[PSC_TEMPERATURE] = 1,
+ .b[PSC_TEMPERATURE] = 0,
+ .R[PSC_TEMPERATURE] = 0,
+ .func[0] =
+ PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
+ PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .identify = mpq8785_identify,
+};
+
+static int mpq8785_probe(struct i2c_client *client)
+{
+ return pmbus_do_probe(client, &mpq8785_info);
+};
+
+static const struct i2c_device_id mpq8785_id[] = {
+ { "mpq8785", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, mpq8785_id);
+
+static const struct of_device_id __maybe_unused mpq8785_of_match[] = {
+ { .compatible = "mps,mpq8785" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mpq8785_of_match);
+
+static struct i2c_driver mpq8785_driver = {
+ .driver = {
+ .name = "mpq8785",
+ .of_match_table = of_match_ptr(mpq8785_of_match),
+ },
+ .probe = mpq8785_probe,
+ .id_table = mpq8785_id,
+};
+
+module_i2c_driver(mpq8785_driver);
+
+MODULE_AUTHOR("Charles Hsu <ythsu0511@gmail.com>");
+MODULE_DESCRIPTION("PMBus driver for MPS MPQ8785");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);