bel-pfe.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Hardware monitoring driver for BEL PFE family power supplies.
  4 *
  5 * Copyright (c) 2019 Facebook Inc.
  6 */
  7
  8#include <linux/err.h>
  9#include <linux/i2c.h>
 10#include <linux/init.h>
 11#include <linux/kernel.h>
 12#include <linux/module.h>
 13#include <linux/pmbus.h>
 14
 15#include "pmbus.h"
 16
 17enum chips {pfe1100, pfe3000};
 18
 19/*
 20 * Disable status check because some devices report communication error
 21 * (invalid command) for VOUT_MODE command (0x20) although the correct
 22 * VOUT_MODE (0x16) is returned: it leads to incorrect exponent in linear
 23 * mode.
 24 * This affects both pfe3000 and pfe1100.
 25 */
 26static struct pmbus_platform_data pfe_plat_data = {
 27	.flags = PMBUS_SKIP_STATUS_CHECK,
 28};
 29
 30static struct pmbus_driver_info pfe_driver_info[] = {
 31	[pfe1100] = {
 32		.pages = 1,
 33		.format[PSC_VOLTAGE_IN] = linear,
 34		.format[PSC_VOLTAGE_OUT] = linear,
 35		.format[PSC_CURRENT_IN] = linear,
 36		.format[PSC_CURRENT_OUT] = linear,
 37		.format[PSC_POWER] = linear,
 38		.format[PSC_TEMPERATURE] = linear,
 39		.format[PSC_FAN] = linear,
 40
 41		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 42			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
 43			   PMBUS_HAVE_POUT |
 44			   PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
 45			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 46			   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
 47			   PMBUS_HAVE_STATUS_TEMP |
 48			   PMBUS_HAVE_FAN12,
 49	},
 50
 51	[pfe3000] = {
 52		.pages = 7,
 53		.format[PSC_VOLTAGE_IN] = linear,
 54		.format[PSC_VOLTAGE_OUT] = linear,
 55		.format[PSC_CURRENT_IN] = linear,
 56		.format[PSC_CURRENT_OUT] = linear,
 57		.format[PSC_POWER] = linear,
 58		.format[PSC_TEMPERATURE] = linear,
 59		.format[PSC_FAN] = linear,
 60
 61		/* Page 0: V1. */
 62		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 63			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
 64			   PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
 65			   PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
 66			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 67			   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
 68			   PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |
 69			   PMBUS_HAVE_VCAP,
 70
 71		/* Page 1: Vsb. */
 72		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 73			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
 74			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 75			   PMBUS_HAVE_POUT,
 76
 77		/*
 78		 * Page 2: V1 Ishare.
 79		 * Page 3: Reserved.
 80		 * Page 4: V1 Cathode.
 81		 * Page 5: Vsb Cathode.
 82		 * Page 6: V1 Sense.
 83		 */
 84		.func[2] = PMBUS_HAVE_VOUT,
 85		.func[4] = PMBUS_HAVE_VOUT,
 86		.func[5] = PMBUS_HAVE_VOUT,
 87		.func[6] = PMBUS_HAVE_VOUT,
 88	},
 89};
 90
 91static const struct i2c_device_id pfe_device_id[];
 92
 93static int pfe_pmbus_probe(struct i2c_client *client)
 94{
 95	int model;
 96
 97	model = (int)i2c_match_id(pfe_device_id, client)->driver_data;
 98	client->dev.platform_data = &pfe_plat_data;
 99
100	/*
101	 * PFE3000-12-069RA devices may not stay in page 0 during device
102	 * probe which leads to probe failure (read status word failed).
103	 * So let's set the device to page 0 at the beginning.
104	 */
105	if (model == pfe3000)
106		i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
107
108	return pmbus_do_probe(client, &pfe_driver_info[model]);
109}
110
111static const struct i2c_device_id pfe_device_id[] = {
112	{"pfe1100", pfe1100},
113	{"pfe3000", pfe3000},
114	{}
115};
116
117MODULE_DEVICE_TABLE(i2c, pfe_device_id);
118
119static struct i2c_driver pfe_pmbus_driver = {
120	.driver = {
121		   .name = "bel-pfe",
122	},
123	.probe = pfe_pmbus_probe,
124	.id_table = pfe_device_id,
125};
126
127module_i2c_driver(pfe_pmbus_driver);
128
129MODULE_AUTHOR("Tao Ren <rentao.bupt@gmail.com>");
130MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies");
131MODULE_LICENSE("GPL");
132MODULE_IMPORT_NS("PMBUS");