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![Jonathan Cameron](/assets/img/avatar_default.png)
One of a class of bugs pointed out by Lars in a recent review.
iio_push_to_buffers_with_timestamp() assumes the buffer used is aligned
to the size of the timestamp (8 bytes). This is not guaranteed in
this driver which uses an array of smaller elements on the stack.
As Lars also noted this anti pattern can involve a leak of data to
userspace and that indeed can happen here. We close both issues by
moving to a suitable structure in the iio_priv() data.
This data is allocated with kzalloc() so no data can leak apart from
previous readings.
The explicit alignment of ts is not necessary in this case but
does make the code slightly less fragile so I have included it.
Fixes: 39631b5f95
("iio: Add Freescale mag3110 magnetometer driver")
Reported-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: <Stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200920112742.170751-4-jic23@kernel.org
656 lines
15 KiB
C
656 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* mag3110.c - Support for Freescale MAG3110 magnetometer sensor
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*
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* Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
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*
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* (7-bit I2C slave address 0x0e)
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*
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* TODO: irq, user offset, oversampling, continuous mode
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/delay.h>
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#include <linux/regulator/consumer.h>
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#define MAG3110_STATUS 0x00
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#define MAG3110_OUT_X 0x01 /* MSB first */
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#define MAG3110_OUT_Y 0x03
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#define MAG3110_OUT_Z 0x05
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#define MAG3110_WHO_AM_I 0x07
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#define MAG3110_SYSMOD 0x08
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#define MAG3110_OFF_X 0x09 /* MSB first */
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#define MAG3110_OFF_Y 0x0b
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#define MAG3110_OFF_Z 0x0d
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#define MAG3110_DIE_TEMP 0x0f
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#define MAG3110_CTRL_REG1 0x10
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#define MAG3110_CTRL_REG2 0x11
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#define MAG3110_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0))
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#define MAG3110_CTRL_DR_MASK (BIT(7) | BIT(6) | BIT(5))
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#define MAG3110_CTRL_DR_SHIFT 5
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#define MAG3110_CTRL_DR_DEFAULT 0
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#define MAG3110_SYSMOD_MODE_MASK GENMASK(1, 0)
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#define MAG3110_CTRL_TM BIT(1) /* trigger single measurement */
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#define MAG3110_CTRL_AC BIT(0) /* continuous measurements */
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#define MAG3110_CTRL_AUTO_MRST_EN BIT(7) /* magnetic auto-reset */
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#define MAG3110_CTRL_RAW BIT(5) /* measurements not user-offset corrected */
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#define MAG3110_DEVICE_ID 0xc4
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/* Each client has this additional data */
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struct mag3110_data {
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struct i2c_client *client;
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struct mutex lock;
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u8 ctrl_reg1;
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int sleep_val;
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struct regulator *vdd_reg;
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struct regulator *vddio_reg;
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/* Ensure natural alignment of timestamp */
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struct {
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__be16 channels[3];
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u8 temperature;
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s64 ts __aligned(8);
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} scan;
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};
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static int mag3110_request(struct mag3110_data *data)
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{
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int ret, tries = 150;
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if ((data->ctrl_reg1 & MAG3110_CTRL_AC) == 0) {
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/* trigger measurement */
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ret = i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
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data->ctrl_reg1 | MAG3110_CTRL_TM);
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if (ret < 0)
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return ret;
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}
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while (tries-- > 0) {
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ret = i2c_smbus_read_byte_data(data->client, MAG3110_STATUS);
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if (ret < 0)
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return ret;
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/* wait for data ready */
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if ((ret & MAG3110_STATUS_DRDY) == MAG3110_STATUS_DRDY)
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break;
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if (data->sleep_val <= 20)
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usleep_range(data->sleep_val * 250, data->sleep_val * 500);
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else
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msleep(20);
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}
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if (tries < 0) {
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dev_err(&data->client->dev, "data not ready\n");
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return -EIO;
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}
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return 0;
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}
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static int mag3110_read(struct mag3110_data *data, __be16 buf[3])
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{
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int ret;
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mutex_lock(&data->lock);
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ret = mag3110_request(data);
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if (ret < 0) {
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mutex_unlock(&data->lock);
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return ret;
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}
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ret = i2c_smbus_read_i2c_block_data(data->client,
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MAG3110_OUT_X, 3 * sizeof(__be16), (u8 *) buf);
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mutex_unlock(&data->lock);
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return ret;
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}
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static ssize_t mag3110_show_int_plus_micros(char *buf,
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const int (*vals)[2], int n)
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{
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size_t len = 0;
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while (n-- > 0)
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len += scnprintf(buf + len, PAGE_SIZE - len,
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"%d.%06d ", vals[n][0], vals[n][1]);
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/* replace trailing space by newline */
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buf[len - 1] = '\n';
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return len;
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}
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static int mag3110_get_int_plus_micros_index(const int (*vals)[2], int n,
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int val, int val2)
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{
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while (n-- > 0)
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if (val == vals[n][0] && val2 == vals[n][1])
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return n;
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return -EINVAL;
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}
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static const int mag3110_samp_freq[8][2] = {
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{80, 0}, {40, 0}, {20, 0}, {10, 0}, {5, 0}, {2, 500000},
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{1, 250000}, {0, 625000}
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};
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static ssize_t mag3110_show_samp_freq_avail(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return mag3110_show_int_plus_micros(buf, mag3110_samp_freq, 8);
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}
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static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(mag3110_show_samp_freq_avail);
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static int mag3110_get_samp_freq_index(struct mag3110_data *data,
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int val, int val2)
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{
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return mag3110_get_int_plus_micros_index(mag3110_samp_freq, 8, val,
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val2);
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}
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static int mag3110_calculate_sleep(struct mag3110_data *data)
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{
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int ret, i = data->ctrl_reg1 >> MAG3110_CTRL_DR_SHIFT;
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if (mag3110_samp_freq[i][0] > 0)
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ret = 1000 / mag3110_samp_freq[i][0];
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else
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ret = 1000;
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return ret == 0 ? 1 : ret;
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}
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static int mag3110_standby(struct mag3110_data *data)
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{
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return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
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data->ctrl_reg1 & ~MAG3110_CTRL_AC);
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}
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static int mag3110_wait_standby(struct mag3110_data *data)
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{
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int ret, tries = 30;
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/*
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* Takes up to 1/ODR to come out of active mode into stby
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* Longest expected period is 12.5seconds.
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* We'll sleep for 500ms between checks
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*/
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while (tries-- > 0) {
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ret = i2c_smbus_read_byte_data(data->client, MAG3110_SYSMOD);
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if (ret < 0) {
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dev_err(&data->client->dev, "i2c error\n");
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return ret;
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}
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/* wait for standby */
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if ((ret & MAG3110_SYSMOD_MODE_MASK) == 0)
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break;
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msleep_interruptible(500);
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}
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if (tries < 0) {
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dev_err(&data->client->dev, "device not entering standby mode\n");
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return -EIO;
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}
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return 0;
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}
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static int mag3110_active(struct mag3110_data *data)
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{
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return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
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data->ctrl_reg1);
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}
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/* returns >0 if active, 0 if in standby and <0 on error */
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static int mag3110_is_active(struct mag3110_data *data)
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{
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int reg;
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reg = i2c_smbus_read_byte_data(data->client, MAG3110_CTRL_REG1);
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if (reg < 0)
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return reg;
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return reg & MAG3110_CTRL_AC;
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}
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static int mag3110_change_config(struct mag3110_data *data, u8 reg, u8 val)
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{
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int ret;
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int is_active;
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mutex_lock(&data->lock);
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is_active = mag3110_is_active(data);
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if (is_active < 0) {
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ret = is_active;
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goto fail;
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}
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/* config can only be changed when in standby */
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if (is_active > 0) {
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ret = mag3110_standby(data);
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if (ret < 0)
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goto fail;
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}
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/*
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* After coming out of active we must wait for the part
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* to transition to STBY. This can take up to 1 /ODR to occur
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*/
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ret = mag3110_wait_standby(data);
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if (ret < 0)
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goto fail;
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ret = i2c_smbus_write_byte_data(data->client, reg, val);
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if (ret < 0)
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goto fail;
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if (is_active > 0) {
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ret = mag3110_active(data);
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if (ret < 0)
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goto fail;
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}
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ret = 0;
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fail:
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mutex_unlock(&data->lock);
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return ret;
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}
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static int mag3110_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct mag3110_data *data = iio_priv(indio_dev);
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__be16 buffer[3];
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int i, ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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return ret;
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switch (chan->type) {
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case IIO_MAGN: /* in 0.1 uT / LSB */
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ret = mag3110_read(data, buffer);
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if (ret < 0)
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goto release;
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*val = sign_extend32(
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be16_to_cpu(buffer[chan->scan_index]), 15);
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ret = IIO_VAL_INT;
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break;
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case IIO_TEMP: /* in 1 C / LSB */
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mutex_lock(&data->lock);
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ret = mag3110_request(data);
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if (ret < 0) {
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mutex_unlock(&data->lock);
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goto release;
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}
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ret = i2c_smbus_read_byte_data(data->client,
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MAG3110_DIE_TEMP);
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mutex_unlock(&data->lock);
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if (ret < 0)
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goto release;
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*val = sign_extend32(ret, 7);
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ret = IIO_VAL_INT;
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break;
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default:
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ret = -EINVAL;
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}
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release:
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iio_device_release_direct_mode(indio_dev);
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return ret;
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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case IIO_MAGN:
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*val = 0;
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*val2 = 1000;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_TEMP:
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*val = 1000;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_SAMP_FREQ:
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i = data->ctrl_reg1 >> MAG3110_CTRL_DR_SHIFT;
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*val = mag3110_samp_freq[i][0];
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*val2 = mag3110_samp_freq[i][1];
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_CALIBBIAS:
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ret = i2c_smbus_read_word_swapped(data->client,
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MAG3110_OFF_X + 2 * chan->scan_index);
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if (ret < 0)
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return ret;
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*val = sign_extend32(ret >> 1, 14);
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return IIO_VAL_INT;
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}
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return -EINVAL;
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}
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static int mag3110_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct mag3110_data *data = iio_priv(indio_dev);
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int rate, ret;
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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return ret;
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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rate = mag3110_get_samp_freq_index(data, val, val2);
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if (rate < 0) {
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ret = -EINVAL;
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break;
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}
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data->ctrl_reg1 &= 0xff & ~MAG3110_CTRL_DR_MASK
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& ~MAG3110_CTRL_AC;
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data->ctrl_reg1 |= rate << MAG3110_CTRL_DR_SHIFT;
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data->sleep_val = mag3110_calculate_sleep(data);
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if (data->sleep_val < 40)
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data->ctrl_reg1 |= MAG3110_CTRL_AC;
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ret = mag3110_change_config(data, MAG3110_CTRL_REG1,
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data->ctrl_reg1);
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break;
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case IIO_CHAN_INFO_CALIBBIAS:
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if (val < -10000 || val > 10000) {
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ret = -EINVAL;
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break;
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}
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ret = i2c_smbus_write_word_swapped(data->client,
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MAG3110_OFF_X + 2 * chan->scan_index, val << 1);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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iio_device_release_direct_mode(indio_dev);
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return ret;
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}
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static irqreturn_t mag3110_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct mag3110_data *data = iio_priv(indio_dev);
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int ret;
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ret = mag3110_read(data, data->scan.channels);
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if (ret < 0)
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goto done;
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if (test_bit(3, indio_dev->active_scan_mask)) {
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ret = i2c_smbus_read_byte_data(data->client,
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MAG3110_DIE_TEMP);
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if (ret < 0)
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goto done;
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data->scan.temperature = ret;
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}
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iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
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iio_get_time_ns(indio_dev));
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done:
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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#define MAG3110_CHANNEL(axis, idx) { \
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.type = IIO_MAGN, \
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.modified = 1, \
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.channel2 = IIO_MOD_##axis, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_CALIBBIAS), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
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BIT(IIO_CHAN_INFO_SCALE), \
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.scan_index = idx, \
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.scan_type = { \
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.sign = 's', \
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.realbits = 16, \
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.storagebits = 16, \
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.endianness = IIO_BE, \
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}, \
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}
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static const struct iio_chan_spec mag3110_channels[] = {
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MAG3110_CHANNEL(X, 0),
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MAG3110_CHANNEL(Y, 1),
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MAG3110_CHANNEL(Z, 2),
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.scan_index = 3,
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.scan_type = {
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.sign = 's',
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.realbits = 8,
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.storagebits = 8,
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},
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},
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static struct attribute *mag3110_attributes[] = {
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&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group mag3110_group = {
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.attrs = mag3110_attributes,
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};
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static const struct iio_info mag3110_info = {
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.attrs = &mag3110_group,
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.read_raw = &mag3110_read_raw,
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.write_raw = &mag3110_write_raw,
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};
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static const unsigned long mag3110_scan_masks[] = {0x7, 0xf, 0};
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static int mag3110_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct mag3110_data *data;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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data->vdd_reg = devm_regulator_get(&client->dev, "vdd");
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if (IS_ERR(data->vdd_reg))
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return dev_err_probe(&client->dev, PTR_ERR(data->vdd_reg),
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"failed to get VDD regulator!\n");
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data->vddio_reg = devm_regulator_get(&client->dev, "vddio");
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if (IS_ERR(data->vddio_reg))
|
|
return dev_err_probe(&client->dev, PTR_ERR(data->vddio_reg),
|
|
"failed to get VDDIO regulator!\n");
|
|
|
|
ret = regulator_enable(data->vdd_reg);
|
|
if (ret) {
|
|
dev_err(&client->dev, "failed to enable VDD regulator!\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regulator_enable(data->vddio_reg);
|
|
if (ret) {
|
|
dev_err(&client->dev, "failed to enable VDDIO regulator!\n");
|
|
goto disable_regulator_vdd;
|
|
}
|
|
|
|
ret = i2c_smbus_read_byte_data(client, MAG3110_WHO_AM_I);
|
|
if (ret < 0)
|
|
goto disable_regulators;
|
|
if (ret != MAG3110_DEVICE_ID) {
|
|
ret = -ENODEV;
|
|
goto disable_regulators;
|
|
}
|
|
|
|
data->client = client;
|
|
mutex_init(&data->lock);
|
|
|
|
i2c_set_clientdata(client, indio_dev);
|
|
indio_dev->info = &mag3110_info;
|
|
indio_dev->name = id->name;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = mag3110_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(mag3110_channels);
|
|
indio_dev->available_scan_masks = mag3110_scan_masks;
|
|
|
|
data->ctrl_reg1 = MAG3110_CTRL_DR_DEFAULT << MAG3110_CTRL_DR_SHIFT;
|
|
data->sleep_val = mag3110_calculate_sleep(data);
|
|
if (data->sleep_val < 40)
|
|
data->ctrl_reg1 |= MAG3110_CTRL_AC;
|
|
|
|
ret = mag3110_change_config(data, MAG3110_CTRL_REG1, data->ctrl_reg1);
|
|
if (ret < 0)
|
|
goto disable_regulators;
|
|
|
|
ret = i2c_smbus_write_byte_data(client, MAG3110_CTRL_REG2,
|
|
MAG3110_CTRL_AUTO_MRST_EN);
|
|
if (ret < 0)
|
|
goto standby_on_error;
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, NULL,
|
|
mag3110_trigger_handler, NULL);
|
|
if (ret < 0)
|
|
goto standby_on_error;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret < 0)
|
|
goto buffer_cleanup;
|
|
return 0;
|
|
|
|
buffer_cleanup:
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
standby_on_error:
|
|
mag3110_standby(iio_priv(indio_dev));
|
|
disable_regulators:
|
|
regulator_disable(data->vddio_reg);
|
|
disable_regulator_vdd:
|
|
regulator_disable(data->vdd_reg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mag3110_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
struct mag3110_data *data = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
mag3110_standby(iio_priv(indio_dev));
|
|
regulator_disable(data->vddio_reg);
|
|
regulator_disable(data->vdd_reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int mag3110_suspend(struct device *dev)
|
|
{
|
|
struct mag3110_data *data = iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev)));
|
|
int ret;
|
|
|
|
ret = mag3110_standby(iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev))));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regulator_disable(data->vddio_reg);
|
|
if (ret) {
|
|
dev_err(dev, "failed to disable VDDIO regulator\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regulator_disable(data->vdd_reg);
|
|
if (ret) {
|
|
dev_err(dev, "failed to disable VDD regulator\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mag3110_resume(struct device *dev)
|
|
{
|
|
struct mag3110_data *data = iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev)));
|
|
int ret;
|
|
|
|
ret = regulator_enable(data->vdd_reg);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable VDD regulator\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regulator_enable(data->vddio_reg);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable VDDIO regulator\n");
|
|
regulator_disable(data->vdd_reg);
|
|
return ret;
|
|
}
|
|
|
|
return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
|
|
data->ctrl_reg1);
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(mag3110_pm_ops, mag3110_suspend, mag3110_resume);
|
|
#define MAG3110_PM_OPS (&mag3110_pm_ops)
|
|
#else
|
|
#define MAG3110_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct i2c_device_id mag3110_id[] = {
|
|
{ "mag3110", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, mag3110_id);
|
|
|
|
static const struct of_device_id mag3110_of_match[] = {
|
|
{ .compatible = "fsl,mag3110" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mag3110_of_match);
|
|
|
|
static struct i2c_driver mag3110_driver = {
|
|
.driver = {
|
|
.name = "mag3110",
|
|
.of_match_table = mag3110_of_match,
|
|
.pm = MAG3110_PM_OPS,
|
|
},
|
|
.probe = mag3110_probe,
|
|
.remove = mag3110_remove,
|
|
.id_table = mag3110_id,
|
|
};
|
|
module_i2c_driver(mag3110_driver);
|
|
|
|
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
|
|
MODULE_DESCRIPTION("Freescale MAG3110 magnetometer driver");
|
|
MODULE_LICENSE("GPL");
|