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f5b75bde41
The maple tree register cache is based on a much more modern data structure than the rbtree cache and makes optimisation choices which are probably more appropriate for modern systems than those made by the rbtree cache. Signed-off-by: Bo Liu <liubo03@inspur.com> Link: https://lore.kernel.org/r/20240202071355.40666-1-liubo03@inspur.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ADT7410/ADT7420 digital temperature sensor driver
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*
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* Copyright 2012-2013 Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/regmap.h>
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#include "adt7x10.h"
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static bool adt7410_regmap_is_volatile(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case ADT7X10_TEMPERATURE:
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case ADT7X10_STATUS:
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return true;
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default:
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return false;
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}
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}
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static int adt7410_reg_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct i2c_client *client = context;
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int regval;
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switch (reg) {
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case ADT7X10_TEMPERATURE:
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case ADT7X10_T_ALARM_HIGH:
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case ADT7X10_T_ALARM_LOW:
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case ADT7X10_T_CRIT:
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regval = i2c_smbus_read_word_swapped(client, reg);
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break;
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default:
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regval = i2c_smbus_read_byte_data(client, reg);
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break;
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}
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if (regval < 0)
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return regval;
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*val = regval;
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return 0;
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}
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static int adt7410_reg_write(void *context, unsigned int reg, unsigned int val)
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{
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struct i2c_client *client = context;
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int ret;
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switch (reg) {
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case ADT7X10_TEMPERATURE:
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case ADT7X10_T_ALARM_HIGH:
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case ADT7X10_T_ALARM_LOW:
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case ADT7X10_T_CRIT:
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ret = i2c_smbus_write_word_swapped(client, reg, val);
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break;
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default:
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ret = i2c_smbus_write_byte_data(client, reg, val);
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break;
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}
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return ret;
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}
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static const struct regmap_config adt7410_regmap_config = {
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = ADT7X10_ID,
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.cache_type = REGCACHE_MAPLE,
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.volatile_reg = adt7410_regmap_is_volatile,
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.reg_read = adt7410_reg_read,
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.reg_write = adt7410_reg_write,
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};
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static int adt7410_i2c_probe(struct i2c_client *client)
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{
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struct regmap *regmap;
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regmap = devm_regmap_init(&client->dev, NULL, client,
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&adt7410_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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return adt7x10_probe(&client->dev, client->name, client->irq, regmap);
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}
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static const struct i2c_device_id adt7410_ids[] = {
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{ "adt7410", 0 },
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{ "adt7420", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, adt7410_ids);
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static struct i2c_driver adt7410_driver = {
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.driver = {
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.name = "adt7410",
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.pm = pm_sleep_ptr(&adt7x10_dev_pm_ops),
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},
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.probe = adt7410_i2c_probe,
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.id_table = adt7410_ids,
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};
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module_i2c_driver(adt7410_driver);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("ADT7410/AD7420 driver");
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MODULE_LICENSE("GPL");
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