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path: root/drivers/hwmon/pmbus/mp5990.c
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Diffstat (limited to 'drivers/hwmon/pmbus/mp5990.c')
-rw-r--r--drivers/hwmon/pmbus/mp5990.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/mp5990.c b/drivers/hwmon/pmbus/mp5990.c
new file mode 100644
index 0000000000..1dfbab25a0
--- /dev/null
+++ b/drivers/hwmon/pmbus/mp5990.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for MPS MP5990 Hot-Swap Controller
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include "pmbus.h"
+
+#define MP5990_EFUSE_CFG (0xC4)
+#define MP5990_VOUT_FORMAT BIT(9)
+
+struct mp5990_data {
+ struct pmbus_driver_info info;
+ u8 vout_mode;
+ u8 vout_linear_exponent;
+};
+
+#define to_mp5990_data(x) container_of(x, struct mp5990_data, info)
+
+static int mp5990_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct mp5990_data *data = to_mp5990_data(info);
+
+ switch (reg) {
+ case PMBUS_VOUT_MODE:
+ if (data->vout_mode == linear) {
+ /*
+ * The VOUT format used by the chip is linear11,
+ * not linear16. Report that VOUT is in linear mode
+ * and return exponent value extracted while probing
+ * the chip.
+ */
+ return data->vout_linear_exponent;
+ }
+
+ /*
+ * The datasheet does not support the VOUT command,
+ * but the device responds with a default value of 0x17.
+ * In the standard, 0x17 represents linear mode.
+ * Therefore, we should report that VOUT is in direct
+ * format when the chip is configured for it.
+ */
+ return PB_VOUT_MODE_DIRECT;
+
+ default:
+ return -ENODATA;
+ }
+}
+
+static int mp5990_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct mp5990_data *data = to_mp5990_data(info);
+ int ret;
+ s32 mantissa;
+
+ switch (reg) {
+ case PMBUS_READ_VOUT:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+ /*
+ * Because the VOUT format used by the chip is linear11 and not
+ * linear16, we disregard bits[15:11]. The exponent is reported
+ * as part of the VOUT_MODE command.
+ */
+ if (data->vout_mode == linear) {
+ mantissa = ((s16)((ret & 0x7ff) << 5)) >> 5;
+ ret = mantissa;
+ }
+ break;
+ default:
+ return -ENODATA;
+ }
+
+ return ret;
+}
+
+static struct pmbus_driver_info mp5990_info = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_IN] = direct,
+ .format[PSC_VOLTAGE_OUT] = direct,
+ .format[PSC_CURRENT_OUT] = direct,
+ .format[PSC_POWER] = direct,
+ .format[PSC_TEMPERATURE] = direct,
+ .m[PSC_VOLTAGE_IN] = 32,
+ .b[PSC_VOLTAGE_IN] = 0,
+ .R[PSC_VOLTAGE_IN] = 0,
+ .m[PSC_VOLTAGE_OUT] = 32,
+ .b[PSC_VOLTAGE_OUT] = 0,
+ .R[PSC_VOLTAGE_OUT] = 0,
+ .m[PSC_CURRENT_OUT] = 16,
+ .b[PSC_CURRENT_OUT] = 0,
+ .R[PSC_CURRENT_OUT] = 0,
+ .m[PSC_POWER] = 1,
+ .b[PSC_POWER] = 0,
+ .R[PSC_POWER] = 0,
+ .m[PSC_TEMPERATURE] = 1,
+ .b[PSC_TEMPERATURE] = 0,
+ .R[PSC_TEMPERATURE] = 0,
+ .func[0] =
+ PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_PIN |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT |
+ PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
+ .read_byte_data = mp5990_read_byte_data,
+ .read_word_data = mp5990_read_word_data,
+};
+
+static int mp5990_probe(struct i2c_client *client)
+{
+ struct pmbus_driver_info *info;
+ struct mp5990_data *data;
+ int ret;
+
+ data = devm_kzalloc(&client->dev, sizeof(struct mp5990_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ memcpy(&data->info, &mp5990_info, sizeof(*info));
+ info = &data->info;
+
+ /* Read Vout Config */
+ ret = i2c_smbus_read_word_data(client, MP5990_EFUSE_CFG);
+ if (ret < 0) {
+ dev_err(&client->dev, "Can't get vout mode.");
+ return ret;
+ }
+
+ /*
+ * EFUSE_CFG (0xC4) bit9=1 is linear mode, bit=0 is direct mode.
+ */
+ if (ret & MP5990_VOUT_FORMAT) {
+ data->vout_mode = linear;
+ data->info.format[PSC_VOLTAGE_IN] = linear;
+ data->info.format[PSC_VOLTAGE_OUT] = linear;
+ data->info.format[PSC_CURRENT_OUT] = linear;
+ data->info.format[PSC_POWER] = linear;
+ ret = i2c_smbus_read_word_data(client, PMBUS_READ_VOUT);
+ if (ret < 0) {
+ dev_err(&client->dev, "Can't get vout exponent.");
+ return ret;
+ }
+ data->vout_linear_exponent = (u8)((ret >> 11) & 0x1f);
+ } else {
+ data->vout_mode = direct;
+ }
+ return pmbus_do_probe(client, info);
+}
+
+static const struct of_device_id mp5990_of_match[] = {
+ { .compatible = "mps,mp5990" },
+ {}
+};
+
+static const struct i2c_device_id mp5990_id[] = {
+ {"mp5990", 0},
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, mp5990_id);
+
+static struct i2c_driver mp5990_driver = {
+ .driver = {
+ .name = "mp5990",
+ .of_match_table = mp5990_of_match,
+ },
+ .probe = mp5990_probe,
+ .id_table = mp5990_id,
+};
+module_i2c_driver(mp5990_driver);
+
+MODULE_AUTHOR("Peter Yin <peter.yin@quantatw.com>");
+MODULE_DESCRIPTION("PMBus driver for MP5990 HSC");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);