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path: root/drivers/hwmon/pmbus/bel-pfe.c
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Diffstat (limited to 'drivers/hwmon/pmbus/bel-pfe.c')
-rw-r--r--drivers/hwmon/pmbus/bel-pfe.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/bel-pfe.c b/drivers/hwmon/pmbus/bel-pfe.c
new file mode 100644
index 000000000000..f236e18f45a5
--- /dev/null
+++ b/drivers/hwmon/pmbus/bel-pfe.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for BEL PFE family power supplies.
+ *
+ * Copyright (c) 2019 Facebook Inc.
+ */
+
+#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"
+
+enum chips {pfe1100, pfe3000};
+
+/*
+ * Disable status check for pfe3000 devices, because some devices report
+ * communication error (invalid command) for VOUT_MODE command (0x20)
+ * although correct VOUT_MODE (0x16) is returned: it leads to incorrect
+ * exponent in linear mode.
+ */
+static struct pmbus_platform_data pfe3000_plat_data = {
+ .flags = PMBUS_SKIP_STATUS_CHECK,
+};
+
+static struct pmbus_driver_info pfe_driver_info[] = {
+ [pfe1100] = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .format[PSC_VOLTAGE_OUT] = linear,
+ .format[PSC_CURRENT_IN] = linear,
+ .format[PSC_CURRENT_OUT] = linear,
+ .format[PSC_POWER] = linear,
+ .format[PSC_TEMPERATURE] = linear,
+ .format[PSC_FAN] = linear,
+
+ .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_POUT |
+ PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
+ PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
+ PMBUS_HAVE_STATUS_TEMP |
+ PMBUS_HAVE_FAN12,
+ },
+
+ [pfe3000] = {
+ .pages = 7,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .format[PSC_VOLTAGE_OUT] = linear,
+ .format[PSC_CURRENT_IN] = linear,
+ .format[PSC_CURRENT_OUT] = linear,
+ .format[PSC_POWER] = linear,
+ .format[PSC_TEMPERATURE] = linear,
+ .format[PSC_FAN] = linear,
+
+ /* Page 0: V1. */
+ .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
+ PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
+ PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
+ PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |
+ PMBUS_HAVE_VCAP,
+
+ /* Page 1: Vsb. */
+ .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
+ PMBUS_HAVE_POUT,
+
+ /*
+ * Page 2: V1 Ishare.
+ * Page 3: Reserved.
+ * Page 4: V1 Cathode.
+ * Page 5: Vsb Cathode.
+ * Page 6: V1 Sense.
+ */
+ .func[2] = PMBUS_HAVE_VOUT,
+ .func[4] = PMBUS_HAVE_VOUT,
+ .func[5] = PMBUS_HAVE_VOUT,
+ .func[6] = PMBUS_HAVE_VOUT,
+ },
+};
+
+static int pfe_pmbus_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int model;
+
+ model = (int)id->driver_data;
+
+ /*
+ * PFE3000-12-069RA devices may not stay in page 0 during device
+ * probe which leads to probe failure (read status word failed).
+ * So let's set the device to page 0 at the beginning.
+ */
+ if (model == pfe3000) {
+ client->dev.platform_data = &pfe3000_plat_data;
+ i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
+ }
+
+ return pmbus_do_probe(client, id, &pfe_driver_info[model]);
+}
+
+static const struct i2c_device_id pfe_device_id[] = {
+ {"pfe1100", pfe1100},
+ {"pfe3000", pfe3000},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, pfe_device_id);
+
+static struct i2c_driver pfe_pmbus_driver = {
+ .driver = {
+ .name = "bel-pfe",
+ },
+ .probe = pfe_pmbus_probe,
+ .remove = pmbus_do_remove,
+ .id_table = pfe_device_id,
+};
+
+module_i2c_driver(pfe_pmbus_driver);
+
+MODULE_AUTHOR("Tao Ren <rentao.bupt@gmail.com>");
+MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies");
+MODULE_LICENSE("GPL");