mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-09-18 22:59:29 +02:00
Uwe Kleine-König (The Capable Hub)
a4fa3300f0
While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. The mentioned robustness is relevant for a planned change to struct i2c_device_id that replaces .driver_data by an anonymous union. While touching all these arrays, unify usage of whitespace. This patch doesn't modify the compiled arrays, only their representation in source form benefits. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/5a4fb64166ab7e06adf94e5fa3d46bb5f6493324.1784299069.git.u.kleine-koenig@baylibre.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
144 lines
3.4 KiB
C
144 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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{
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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 void 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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}
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static const struct i2c_device_id hmc6352_id[] = {
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{ .name = "hmc6352" },
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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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