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dd43193976
pmbus_do_probe doesn't use the id information provided in its second
argument, so this can be removed, which then allows using the
single-parameter i2c probe function ("probe_new") for probes.
This avoids scanning the identifier tables during probes.
Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:
* if the information in i2c_client is sufficient, that's used instead
(client->name);
* configured v. probed comparisons are performed by comparing the
configured name to the detected name, instead of the ids; this
involves strcmp but is still cheaper than comparing all the device
names when scanning the tables;
* anything else is handled by calling i2c_match_id() with the same
level of error-handling (if any) as before.
Additionally, the mismatch message in the ltc2978 driver is adjusted
so that it no longer assumes that the driver_data is an index into
ltc2978_id.
Signed-off-by: Stephen Kitt <steve@sk2.org>
Acked-by: Wolfram Sang <wsa@kernel.org>
Link: https://lore.kernel.org/r/20200808210004.30880-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for Maxim MAX16064
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*
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* Copyright (c) 2011 Ericsson AB.
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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/i2c.h>
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#include "pmbus.h"
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#define MAX16064_MFR_VOUT_PEAK 0xd4
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#define MAX16064_MFR_TEMPERATURE_PEAK 0xd6
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static int max16064_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_VOUT_MAX:
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ret = pmbus_read_word_data(client, page, phase,
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MAX16064_MFR_VOUT_PEAK);
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break;
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case PMBUS_VIRT_READ_TEMP_MAX:
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ret = pmbus_read_word_data(client, page, phase,
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MAX16064_MFR_TEMPERATURE_PEAK);
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break;
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case PMBUS_VIRT_RESET_VOUT_HISTORY:
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case PMBUS_VIRT_RESET_TEMP_HISTORY:
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ret = 0;
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static int max16064_write_word_data(struct i2c_client *client, int page,
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int reg, u16 word)
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{
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int ret;
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switch (reg) {
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case PMBUS_VIRT_RESET_VOUT_HISTORY:
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ret = pmbus_write_word_data(client, page,
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MAX16064_MFR_VOUT_PEAK, 0);
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break;
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case PMBUS_VIRT_RESET_TEMP_HISTORY:
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ret = pmbus_write_word_data(client, page,
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MAX16064_MFR_TEMPERATURE_PEAK,
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0xffff);
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static struct pmbus_driver_info max16064_info = {
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.pages = 4,
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.format[PSC_VOLTAGE_IN] = direct,
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.format[PSC_VOLTAGE_OUT] = direct,
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.format[PSC_TEMPERATURE] = direct,
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.m[PSC_VOLTAGE_IN] = 19995,
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.b[PSC_VOLTAGE_IN] = 0,
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.R[PSC_VOLTAGE_IN] = -1,
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.m[PSC_VOLTAGE_OUT] = 19995,
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.b[PSC_VOLTAGE_OUT] = 0,
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.R[PSC_VOLTAGE_OUT] = -1,
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.m[PSC_TEMPERATURE] = -7612,
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.b[PSC_TEMPERATURE] = 335,
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.R[PSC_TEMPERATURE] = -3,
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.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP
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| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP,
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.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
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.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
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.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
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.read_word_data = max16064_read_word_data,
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.write_word_data = max16064_write_word_data,
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};
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static int max16064_probe(struct i2c_client *client)
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{
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return pmbus_do_probe(client, &max16064_info);
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}
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static const struct i2c_device_id max16064_id[] = {
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{"max16064", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, max16064_id);
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/* This is the driver that will be inserted */
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static struct i2c_driver max16064_driver = {
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.driver = {
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.name = "max16064",
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},
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.probe_new = max16064_probe,
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.remove = pmbus_do_remove,
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.id_table = max16064_id,
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};
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module_i2c_driver(max16064_driver);
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064");
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MODULE_LICENSE("GPL");
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