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Use the generic pmbus bus access delay. Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Message-ID: <20240902075319.585656-2-patrick.rudolph@9elements.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for Maxim MAX15301
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*
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* Copyright (c) 2021 Flextronics International Sweden AB
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*
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* Even though the specification does not specifically mention it,
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* extensive empirical testing has revealed that auto-detection of
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* limit-registers will fail in a random fashion unless the delay
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* parameter is set to above about 80us. The default delay is set
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* to 100us to include some safety margin.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/ktime.h>
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#include <linux/delay.h>
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#include <linux/pmbus.h>
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#include "pmbus.h"
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static const struct i2c_device_id max15301_id[] = {
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{ "bmr461" },
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{ "max15301" },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, max15301_id);
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struct max15301_data {
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int id;
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struct pmbus_driver_info info;
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};
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#define to_max15301_data(x) container_of(x, struct max15301_data, info)
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#define MAX15301_WAIT_TIME 100 /* us */
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static ushort delay = MAX15301_WAIT_TIME;
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module_param(delay, ushort, 0644);
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MODULE_PARM_DESC(delay, "Delay between chip accesses in us");
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static struct max15301_data max15301_data = {
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.info = {
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.pages = 1,
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.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
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| PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
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| PMBUS_HAVE_STATUS_TEMP
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
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}
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};
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static int max15301_probe(struct i2c_client *client)
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{
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int status;
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u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
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const struct i2c_device_id *mid;
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struct pmbus_driver_info *info = &max15301_data.info;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_BYTE_DATA
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| I2C_FUNC_SMBUS_BLOCK_DATA))
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return -ENODEV;
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status = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, device_id);
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if (status < 0) {
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dev_err(&client->dev, "Failed to read Device Id\n");
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return status;
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}
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for (mid = max15301_id; mid->name[0]; mid++) {
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if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
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break;
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}
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if (!mid->name[0]) {
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dev_err(&client->dev, "Unsupported device\n");
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return -ENODEV;
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}
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info->access_delay = delay;
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return pmbus_do_probe(client, info);
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}
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static struct i2c_driver max15301_driver = {
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.driver = {
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.name = "max15301",
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},
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.probe = max15301_probe,
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.id_table = max15301_id,
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};
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module_i2c_driver(max15301_driver);
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MODULE_AUTHOR("Erik Rosen <erik.rosen@metormote.com>");
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MODULE_DESCRIPTION("PMBus driver for Maxim MAX15301");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(PMBUS);
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