forked from Minki/linux
873e65bc09
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation version 2 of the license this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 83 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.021731668@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* hmc6352.c - Honeywell Compass Driver
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*
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* Copyright (C) 2009 Intel Corp
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/sysfs.h>
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#include <linux/nospec.h>
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static DEFINE_MUTEX(compass_mutex);
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static int compass_command(struct i2c_client *c, u8 cmd)
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{
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int ret = i2c_master_send(c, &cmd, 1);
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if (ret < 0)
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dev_warn(&c->dev, "command '%c' failed.\n", cmd);
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return ret;
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}
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static int compass_store(struct device *dev, const char *buf, size_t count,
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const char *map)
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{
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struct i2c_client *c = to_i2c_client(dev);
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int ret;
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unsigned long val;
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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if (val >= strlen(map))
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return -EINVAL;
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val = array_index_nospec(val, strlen(map));
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mutex_lock(&compass_mutex);
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ret = compass_command(c, map[val]);
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mutex_unlock(&compass_mutex);
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if (ret < 0)
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return ret;
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return count;
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}
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static ssize_t compass_calibration_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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return compass_store(dev, buf, count, "EC");
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}
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static ssize_t compass_power_mode_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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return compass_store(dev, buf, count, "SW");
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}
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static ssize_t compass_heading_data_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char i2c_data[2];
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int ret;
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mutex_lock(&compass_mutex);
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ret = compass_command(client, 'A');
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if (ret != 1) {
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mutex_unlock(&compass_mutex);
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return ret;
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}
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msleep(10); /* sending 'A' cmd we need to wait for 7-10 millisecs */
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ret = i2c_master_recv(client, i2c_data, 2);
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mutex_unlock(&compass_mutex);
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if (ret < 0) {
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dev_warn(dev, "i2c read data cmd failed\n");
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return ret;
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}
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ret = (i2c_data[0] << 8) | i2c_data[1];
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return sprintf(buf, "%d.%d\n", ret/10, ret%10);
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}
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static DEVICE_ATTR(heading0_input, S_IRUGO, compass_heading_data_show, NULL);
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static DEVICE_ATTR(calibration, S_IWUSR, NULL, compass_calibration_store);
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static DEVICE_ATTR(power_state, S_IWUSR, NULL, compass_power_mode_store);
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static struct attribute *mid_att_compass[] = {
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&dev_attr_heading0_input.attr,
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&dev_attr_calibration.attr,
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&dev_attr_power_state.attr,
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NULL
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};
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static const struct attribute_group m_compass_gr = {
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.name = "hmc6352",
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.attrs = mid_att_compass
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};
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static int hmc6352_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int res;
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res = sysfs_create_group(&client->dev.kobj, &m_compass_gr);
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if (res) {
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dev_err(&client->dev, "device_create_file failed\n");
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return res;
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}
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dev_info(&client->dev, "%s HMC6352 compass chip found\n",
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client->name);
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return 0;
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}
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static int hmc6352_remove(struct i2c_client *client)
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{
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sysfs_remove_group(&client->dev.kobj, &m_compass_gr);
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return 0;
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}
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static const struct i2c_device_id hmc6352_id[] = {
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{ "hmc6352", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, hmc6352_id);
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static struct i2c_driver hmc6352_driver = {
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.driver = {
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.name = "hmc6352",
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},
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.probe = hmc6352_probe,
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.remove = hmc6352_remove,
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.id_table = hmc6352_id,
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};
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module_i2c_driver(hmc6352_driver);
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MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
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MODULE_DESCRIPTION("hmc6352 Compass Driver");
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MODULE_LICENSE("GPL v2");
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