// SPDX-License-Identifier: GPL-2.0+
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/*
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* API bus driver for ADT7316/7/8 ADT7516/7/9 digital temperature
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* sensor, ADC and DAC
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*
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* Copyright 2010 Analog Devices Inc.
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/spi/spi.h>
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#include "adt7316.h"
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#define ADT7316_SPI_MAX_FREQ_HZ 5000000
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#define ADT7316_SPI_CMD_READ 0x91
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#define ADT7316_SPI_CMD_WRITE 0x90
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/*
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* adt7316 register access by SPI
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*/
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static int adt7316_spi_multi_read(void *client, u8 reg, u8 count, u8 *data)
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{
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struct spi_device *spi_dev = client;
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u8 cmd[2];
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int ret;
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if (count > ADT7316_REG_MAX_ADDR)
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count = ADT7316_REG_MAX_ADDR;
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cmd[0] = ADT7316_SPI_CMD_WRITE;
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cmd[1] = reg;
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ret = spi_write(spi_dev, cmd, 2);
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if (ret < 0) {
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dev_err(&spi_dev->dev, "SPI fail to select reg\n");
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return ret;
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}
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cmd[0] = ADT7316_SPI_CMD_READ;
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ret = spi_write_then_read(spi_dev, cmd, 1, data, count);
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if (ret < 0) {
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dev_err(&spi_dev->dev, "SPI read data error\n");
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return ret;
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}
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return 0;
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}
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static int adt7316_spi_multi_write(void *client, u8 reg, u8 count, u8 *data)
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{
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struct spi_device *spi_dev = client;
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u8 buf[ADT7316_REG_MAX_ADDR + 2];
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int i, ret;
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if (count > ADT7316_REG_MAX_ADDR)
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count = ADT7316_REG_MAX_ADDR;
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buf[0] = ADT7316_SPI_CMD_WRITE;
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buf[1] = reg;
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for (i = 0; i < count; i++)
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buf[i + 2] = data[i];
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ret = spi_write(spi_dev, buf, count + 2);
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if (ret < 0) {
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dev_err(&spi_dev->dev, "SPI write error\n");
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return ret;
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}
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return ret;
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}
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static int adt7316_spi_read(void *client, u8 reg, u8 *data)
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{
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return adt7316_spi_multi_read(client, reg, 1, data);
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}
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static int adt7316_spi_write(void *client, u8 reg, u8 val)
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{
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return adt7316_spi_multi_write(client, reg, 1, &val);
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}
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/*
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* device probe and remove
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*/
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static int adt7316_spi_probe(struct spi_device *spi_dev)
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{
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struct adt7316_bus bus = {
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.client = spi_dev,
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.irq = spi_dev->irq,
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.read = adt7316_spi_read,
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.write = adt7316_spi_write,
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.multi_read = adt7316_spi_multi_read,
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.multi_write = adt7316_spi_multi_write,
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};
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/* don't exceed max specified SPI CLK frequency */
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if (spi_dev->max_speed_hz > ADT7316_SPI_MAX_FREQ_HZ) {
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dev_err(&spi_dev->dev, "SPI CLK %d Hz?\n",
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spi_dev->max_speed_hz);
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return -EINVAL;
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}
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/* switch from default I2C protocol to SPI protocol */
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adt7316_spi_write(spi_dev, 0, 0);
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adt7316_spi_write(spi_dev, 0, 0);
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adt7316_spi_write(spi_dev, 0, 0);
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return adt7316_probe(&spi_dev->dev, &bus, spi_dev->modalias);
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}
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static const struct spi_device_id adt7316_spi_id[] = {
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{ "adt7316", 0 },
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{ "adt7317", 0 },
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{ "adt7318", 0 },
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{ "adt7516", 0 },
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{ "adt7517", 0 },
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{ "adt7519", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, adt7316_spi_id);
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static const struct of_device_id adt7316_of_spi_match[] = {
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{ .compatible = "adi,adt7316" },
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{ .compatible = "adi,adt7317" },
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{ .compatible = "adi,adt7318" },
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{ .compatible = "adi,adt7516" },
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{ .compatible = "adi,adt7517" },
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{ .compatible = "adi,adt7519" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, adt7316_of_spi_match);
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static struct spi_driver adt7316_driver = {
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.driver = {
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.name = "adt7316",
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.of_match_table = adt7316_of_spi_match,
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.pm = ADT7316_PM_OPS,
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},
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.probe = adt7316_spi_probe,
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.id_table = adt7316_spi_id,
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};
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module_spi_driver(adt7316_driver);
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MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
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MODULE_DESCRIPTION("SPI bus driver for Analog Devices ADT7316/7/8 and ADT7516/7/9 digital temperature sensor, ADC and DAC");
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MODULE_LICENSE("GPL v2");
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