mirror of https://gitee.com/openkylin/linux.git
1016 lines
25 KiB
C
1016 lines
25 KiB
C
/*
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* mma8452.c - Support for Freescale MMA8452Q 3-axis 12-bit accelerometer
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*
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* Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* 7-bit I2C slave address 0x1c/0x1d (pin selectable)
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*
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* TODO: orientation / freefall events, autosleep
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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/buffer.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/events.h>
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#include <linux/delay.h>
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#define MMA8452_STATUS 0x00
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#define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0))
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#define MMA8452_OUT_X 0x01 /* MSB first, 12-bit */
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#define MMA8452_OUT_Y 0x03
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#define MMA8452_OUT_Z 0x05
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#define MMA8452_INT_SRC 0x0c
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#define MMA8452_WHO_AM_I 0x0d
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#define MMA8452_DATA_CFG 0x0e
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#define MMA8452_DATA_CFG_FS_MASK GENMASK(1, 0)
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#define MMA8452_DATA_CFG_FS_2G 0
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#define MMA8452_DATA_CFG_FS_4G 1
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#define MMA8452_DATA_CFG_FS_8G 2
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#define MMA8452_DATA_CFG_HPF_MASK BIT(4)
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#define MMA8452_HP_FILTER_CUTOFF 0x0f
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#define MMA8452_HP_FILTER_CUTOFF_SEL_MASK GENMASK(1, 0)
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#define MMA8452_TRANSIENT_CFG 0x1d
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#define MMA8452_TRANSIENT_CFG_HPF_BYP BIT(0)
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#define MMA8452_TRANSIENT_CFG_CHAN(chan) BIT(chan + 1)
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#define MMA8452_TRANSIENT_CFG_ELE BIT(4)
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#define MMA8452_TRANSIENT_SRC 0x1e
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#define MMA8452_TRANSIENT_SRC_XTRANSE BIT(1)
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#define MMA8452_TRANSIENT_SRC_YTRANSE BIT(3)
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#define MMA8452_TRANSIENT_SRC_ZTRANSE BIT(5)
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#define MMA8452_TRANSIENT_THS 0x1f
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#define MMA8452_TRANSIENT_THS_MASK GENMASK(6, 0)
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#define MMA8452_TRANSIENT_COUNT 0x20
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#define MMA8452_CTRL_REG1 0x2a
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#define MMA8452_CTRL_ACTIVE BIT(0)
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#define MMA8452_CTRL_DR_MASK GENMASK(5, 3)
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#define MMA8452_CTRL_DR_SHIFT 3
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#define MMA8452_CTRL_DR_DEFAULT 0x4 /* 50 Hz sample frequency */
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#define MMA8452_CTRL_REG2 0x2b
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#define MMA8452_CTRL_REG2_RST BIT(6)
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#define MMA8452_CTRL_REG4 0x2d
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#define MMA8452_CTRL_REG5 0x2e
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#define MMA8452_OFF_X 0x2f
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#define MMA8452_OFF_Y 0x30
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#define MMA8452_OFF_Z 0x31
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#define MMA8452_MAX_REG 0x31
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#define MMA8452_INT_DRDY BIT(0)
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#define MMA8452_INT_TRANS BIT(5)
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#define MMA8452_DEVICE_ID 0x2a
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struct mma8452_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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u8 data_cfg;
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};
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static int mma8452_drdy(struct mma8452_data *data)
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{
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int tries = 150;
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while (tries-- > 0) {
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int ret = i2c_smbus_read_byte_data(data->client,
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MMA8452_STATUS);
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if (ret < 0)
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return ret;
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if ((ret & MMA8452_STATUS_DRDY) == MMA8452_STATUS_DRDY)
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return 0;
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msleep(20);
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}
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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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static int mma8452_read(struct mma8452_data *data, __be16 buf[3])
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{
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int ret = mma8452_drdy(data);
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if (ret < 0)
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return ret;
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return i2c_smbus_read_i2c_block_data(data->client, MMA8452_OUT_X,
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3 * sizeof(__be16), (u8 *)buf);
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}
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static ssize_t mma8452_show_int_plus_micros(char *buf, const int (*vals)[2],
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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, "%d.%06d ",
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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 mma8452_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 int mma8452_get_odr_index(struct mma8452_data *data)
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{
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return (data->ctrl_reg1 & MMA8452_CTRL_DR_MASK) >>
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MMA8452_CTRL_DR_SHIFT;
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}
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static const int mma8452_samp_freq[8][2] = {
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{800, 0}, {400, 0}, {200, 0}, {100, 0}, {50, 0}, {12, 500000},
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{6, 250000}, {1, 560000}
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};
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/*
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* Hardware has fullscale of -2G, -4G, -8G corresponding to raw value -2048
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* The userspace interface uses m/s^2 and we declare micro units
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* So scale factor is given by:
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* g * N * 1000000 / 2048 for N = 2, 4, 8 and g = 9.80665
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*/
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static const int mma8452_scales[3][2] = {
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{0, 9577}, {0, 19154}, {0, 38307}
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};
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/* Datasheet table 35 (step time vs sample frequency) */
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static const int mma8452_transient_time_step_us[8] = {
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1250,
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2500,
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5000,
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10000,
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20000,
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20000,
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20000,
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20000
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};
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/* Datasheet table 18 (normal mode) */
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static const int mma8452_hp_filter_cutoff[8][4][2] = {
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{ {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 800 Hz sample */
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{ {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 400 Hz sample */
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{ {8, 0}, {4, 0}, {2, 0}, {1, 0} }, /* 200 Hz sample */
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{ {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, /* 100 Hz sample */
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{ {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 50 Hz sample */
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{ {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 12.5 Hz sample */
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{ {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 6.25 Hz sample */
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{ {2, 0}, {1, 0}, {0, 500000}, {0, 250000} } /* 1.56 Hz sample */
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};
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static ssize_t mma8452_show_samp_freq_avail(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return mma8452_show_int_plus_micros(buf, mma8452_samp_freq,
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ARRAY_SIZE(mma8452_samp_freq));
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}
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static ssize_t mma8452_show_scale_avail(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return mma8452_show_int_plus_micros(buf, mma8452_scales,
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ARRAY_SIZE(mma8452_scales));
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}
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static ssize_t mma8452_show_hp_cutoff_avail(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct mma8452_data *data = iio_priv(indio_dev);
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int i = mma8452_get_odr_index(data);
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return mma8452_show_int_plus_micros(buf, mma8452_hp_filter_cutoff[i],
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ARRAY_SIZE(mma8452_hp_filter_cutoff[0]));
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}
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static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(mma8452_show_samp_freq_avail);
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static IIO_DEVICE_ATTR(in_accel_scale_available, S_IRUGO,
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mma8452_show_scale_avail, NULL, 0);
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static IIO_DEVICE_ATTR(in_accel_filter_high_pass_3db_frequency_available,
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S_IRUGO, mma8452_show_hp_cutoff_avail, NULL, 0);
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static int mma8452_get_samp_freq_index(struct mma8452_data *data,
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int val, int val2)
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{
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return mma8452_get_int_plus_micros_index(mma8452_samp_freq,
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ARRAY_SIZE(mma8452_samp_freq),
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val, val2);
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}
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static int mma8452_get_scale_index(struct mma8452_data *data, int val, int val2)
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{
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return mma8452_get_int_plus_micros_index(mma8452_scales,
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ARRAY_SIZE(mma8452_scales),
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val, val2);
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}
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static int mma8452_get_hp_filter_index(struct mma8452_data *data,
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int val, int val2)
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{
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int i = mma8452_get_odr_index(data);
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return mma8452_get_int_plus_micros_index(mma8452_hp_filter_cutoff[i],
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ARRAY_SIZE(mma8452_hp_filter_cutoff[0]), val, val2);
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}
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static int mma8452_read_hp_filter(struct mma8452_data *data, int *hz, int *uHz)
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{
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int i, ret;
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ret = i2c_smbus_read_byte_data(data->client, MMA8452_HP_FILTER_CUTOFF);
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if (ret < 0)
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return ret;
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i = mma8452_get_odr_index(data);
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ret &= MMA8452_HP_FILTER_CUTOFF_SEL_MASK;
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*hz = mma8452_hp_filter_cutoff[i][ret][0];
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*uHz = mma8452_hp_filter_cutoff[i][ret][1];
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return 0;
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}
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static int mma8452_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 mma8452_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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if (iio_buffer_enabled(indio_dev))
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return -EBUSY;
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mutex_lock(&data->lock);
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ret = mma8452_read(data, buffer);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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*val = sign_extend32(be16_to_cpu(buffer[chan->scan_index]) >> 4,
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11);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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i = data->data_cfg & MMA8452_DATA_CFG_FS_MASK;
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*val = mma8452_scales[i][0];
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*val2 = mma8452_scales[i][1];
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SAMP_FREQ:
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i = mma8452_get_odr_index(data);
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*val = mma8452_samp_freq[i][0];
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*val2 = mma8452_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_byte_data(data->client,
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MMA8452_OFF_X + chan->scan_index);
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if (ret < 0)
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return ret;
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*val = sign_extend32(ret, 7);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
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if (data->data_cfg & MMA8452_DATA_CFG_HPF_MASK) {
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ret = mma8452_read_hp_filter(data, val, val2);
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if (ret < 0)
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return ret;
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} else {
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*val = 0;
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*val2 = 0;
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}
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return IIO_VAL_INT_PLUS_MICRO;
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}
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return -EINVAL;
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}
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static int mma8452_standby(struct mma8452_data *data)
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{
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return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1,
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data->ctrl_reg1 & ~MMA8452_CTRL_ACTIVE);
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}
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static int mma8452_active(struct mma8452_data *data)
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{
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return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1,
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data->ctrl_reg1);
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}
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static int mma8452_change_config(struct mma8452_data *data, u8 reg, u8 val)
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{
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int ret;
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mutex_lock(&data->lock);
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/* config can only be changed when in standby */
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ret = mma8452_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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ret = mma8452_active(data);
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if (ret < 0)
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goto fail;
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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 mma8452_set_hp_filter_frequency(struct mma8452_data *data,
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int val, int val2)
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{
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int i, reg;
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i = mma8452_get_hp_filter_index(data, val, val2);
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if (i < 0)
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return i;
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reg = i2c_smbus_read_byte_data(data->client,
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MMA8452_HP_FILTER_CUTOFF);
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if (reg < 0)
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return reg;
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reg &= ~MMA8452_HP_FILTER_CUTOFF_SEL_MASK;
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reg |= i;
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return mma8452_change_config(data, MMA8452_HP_FILTER_CUTOFF, reg);
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}
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static int mma8452_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 mma8452_data *data = iio_priv(indio_dev);
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int i, ret;
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if (iio_buffer_enabled(indio_dev))
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return -EBUSY;
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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i = mma8452_get_samp_freq_index(data, val, val2);
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if (i < 0)
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return i;
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data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK;
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data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT;
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return mma8452_change_config(data, MMA8452_CTRL_REG1,
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data->ctrl_reg1);
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case IIO_CHAN_INFO_SCALE:
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i = mma8452_get_scale_index(data, val, val2);
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if (i < 0)
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return i;
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data->data_cfg &= ~MMA8452_DATA_CFG_FS_MASK;
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data->data_cfg |= i;
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return mma8452_change_config(data, MMA8452_DATA_CFG,
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data->data_cfg);
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case IIO_CHAN_INFO_CALIBBIAS:
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if (val < -128 || val > 127)
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return -EINVAL;
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return mma8452_change_config(data,
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MMA8452_OFF_X + chan->scan_index,
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val);
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case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
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if (val == 0 && val2 == 0) {
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data->data_cfg &= ~MMA8452_DATA_CFG_HPF_MASK;
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} else {
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data->data_cfg |= MMA8452_DATA_CFG_HPF_MASK;
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ret = mma8452_set_hp_filter_frequency(data, val, val2);
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if (ret < 0)
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return ret;
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}
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return mma8452_change_config(data, MMA8452_DATA_CFG,
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data->data_cfg);
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default:
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return -EINVAL;
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}
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}
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static int mma8452_read_thresh(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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enum iio_event_info info,
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int *val, int *val2)
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{
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struct mma8452_data *data = iio_priv(indio_dev);
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int ret, us;
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switch (info) {
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case IIO_EV_INFO_VALUE:
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ret = i2c_smbus_read_byte_data(data->client,
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MMA8452_TRANSIENT_THS);
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if (ret < 0)
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return ret;
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*val = ret & MMA8452_TRANSIENT_THS_MASK;
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return IIO_VAL_INT;
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case IIO_EV_INFO_PERIOD:
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ret = i2c_smbus_read_byte_data(data->client,
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MMA8452_TRANSIENT_COUNT);
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if (ret < 0)
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return ret;
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us = ret * mma8452_transient_time_step_us[
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mma8452_get_odr_index(data)];
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*val = us / USEC_PER_SEC;
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*val2 = us % USEC_PER_SEC;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_EV_INFO_HIGH_PASS_FILTER_3DB:
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ret = i2c_smbus_read_byte_data(data->client,
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MMA8452_TRANSIENT_CFG);
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if (ret < 0)
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return ret;
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|
|
if (ret & MMA8452_TRANSIENT_CFG_HPF_BYP) {
|
|
*val = 0;
|
|
*val2 = 0;
|
|
} else {
|
|
ret = mma8452_read_hp_filter(data, val, val2);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int mma8452_write_thresh(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir,
|
|
enum iio_event_info info,
|
|
int val, int val2)
|
|
{
|
|
struct mma8452_data *data = iio_priv(indio_dev);
|
|
int ret, reg, steps;
|
|
|
|
switch (info) {
|
|
case IIO_EV_INFO_VALUE:
|
|
if (val < 0 || val > MMA8452_TRANSIENT_THS_MASK)
|
|
return -EINVAL;
|
|
|
|
return mma8452_change_config(data, MMA8452_TRANSIENT_THS, val);
|
|
|
|
case IIO_EV_INFO_PERIOD:
|
|
steps = (val * USEC_PER_SEC + val2) /
|
|
mma8452_transient_time_step_us[
|
|
mma8452_get_odr_index(data)];
|
|
|
|
if (steps < 0 || steps > 0xff)
|
|
return -EINVAL;
|
|
|
|
return mma8452_change_config(data, MMA8452_TRANSIENT_COUNT,
|
|
steps);
|
|
|
|
case IIO_EV_INFO_HIGH_PASS_FILTER_3DB:
|
|
reg = i2c_smbus_read_byte_data(data->client,
|
|
MMA8452_TRANSIENT_CFG);
|
|
if (reg < 0)
|
|
return reg;
|
|
|
|
if (val == 0 && val2 == 0) {
|
|
reg |= MMA8452_TRANSIENT_CFG_HPF_BYP;
|
|
} else {
|
|
reg &= ~MMA8452_TRANSIENT_CFG_HPF_BYP;
|
|
ret = mma8452_set_hp_filter_frequency(data, val, val2);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return mma8452_change_config(data, MMA8452_TRANSIENT_CFG, reg);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int mma8452_read_event_config(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir)
|
|
{
|
|
struct mma8452_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_CFG);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return ret & MMA8452_TRANSIENT_CFG_CHAN(chan->scan_index) ? 1 : 0;
|
|
}
|
|
|
|
static int mma8452_write_event_config(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir,
|
|
int state)
|
|
{
|
|
struct mma8452_data *data = iio_priv(indio_dev);
|
|
int val;
|
|
|
|
val = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_CFG);
|
|
if (val < 0)
|
|
return val;
|
|
|
|
if (state)
|
|
val |= MMA8452_TRANSIENT_CFG_CHAN(chan->scan_index);
|
|
else
|
|
val &= ~MMA8452_TRANSIENT_CFG_CHAN(chan->scan_index);
|
|
|
|
val |= MMA8452_TRANSIENT_CFG_ELE;
|
|
|
|
return mma8452_change_config(data, MMA8452_TRANSIENT_CFG, val);
|
|
}
|
|
|
|
static void mma8452_transient_interrupt(struct iio_dev *indio_dev)
|
|
{
|
|
struct mma8452_data *data = iio_priv(indio_dev);
|
|
s64 ts = iio_get_time_ns();
|
|
int src;
|
|
|
|
src = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_SRC);
|
|
if (src < 0)
|
|
return;
|
|
|
|
if (src & MMA8452_TRANSIENT_SRC_XTRANSE)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_RISING),
|
|
ts);
|
|
|
|
if (src & MMA8452_TRANSIENT_SRC_YTRANSE)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Y,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_RISING),
|
|
ts);
|
|
|
|
if (src & MMA8452_TRANSIENT_SRC_ZTRANSE)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Z,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_RISING),
|
|
ts);
|
|
}
|
|
|
|
static irqreturn_t mma8452_interrupt(int irq, void *p)
|
|
{
|
|
struct iio_dev *indio_dev = p;
|
|
struct mma8452_data *data = iio_priv(indio_dev);
|
|
int ret = IRQ_NONE;
|
|
int src;
|
|
|
|
src = i2c_smbus_read_byte_data(data->client, MMA8452_INT_SRC);
|
|
if (src < 0)
|
|
return IRQ_NONE;
|
|
|
|
if (src & MMA8452_INT_DRDY) {
|
|
iio_trigger_poll_chained(indio_dev->trig);
|
|
ret = IRQ_HANDLED;
|
|
}
|
|
|
|
if (src & MMA8452_INT_TRANS) {
|
|
mma8452_transient_interrupt(indio_dev);
|
|
ret = IRQ_HANDLED;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t mma8452_trigger_handler(int irq, void *p)
|
|
{
|
|
struct iio_poll_func *pf = p;
|
|
struct iio_dev *indio_dev = pf->indio_dev;
|
|
struct mma8452_data *data = iio_priv(indio_dev);
|
|
u8 buffer[16]; /* 3 16-bit channels + padding + ts */
|
|
int ret;
|
|
|
|
ret = mma8452_read(data, (__be16 *)buffer);
|
|
if (ret < 0)
|
|
goto done;
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, buffer,
|
|
iio_get_time_ns());
|
|
|
|
done:
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int mma8452_reg_access_dbg(struct iio_dev *indio_dev,
|
|
unsigned reg, unsigned writeval,
|
|
unsigned *readval)
|
|
{
|
|
int ret;
|
|
struct mma8452_data *data = iio_priv(indio_dev);
|
|
|
|
if (reg > MMA8452_MAX_REG)
|
|
return -EINVAL;
|
|
|
|
if (!readval)
|
|
return mma8452_change_config(data, reg, writeval);
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, reg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*readval = ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iio_event_spec mma8452_transient_event[] = {
|
|
{
|
|
.type = IIO_EV_TYPE_MAG,
|
|
.dir = IIO_EV_DIR_RISING,
|
|
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
|
|
.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
|
|
BIT(IIO_EV_INFO_PERIOD) |
|
|
BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB)
|
|
},
|
|
};
|
|
|
|
/*
|
|
* Threshold is configured in fixed 8G/127 steps regardless of
|
|
* currently selected scale for measurement.
|
|
*/
|
|
static IIO_CONST_ATTR_NAMED(accel_transient_scale, in_accel_scale, "0.617742");
|
|
|
|
static struct attribute *mma8452_event_attributes[] = {
|
|
&iio_const_attr_accel_transient_scale.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group mma8452_event_attribute_group = {
|
|
.attrs = mma8452_event_attributes,
|
|
.name = "events",
|
|
};
|
|
|
|
#define MMA8452_CHANNEL(axis, idx) { \
|
|
.type = IIO_ACCEL, \
|
|
.modified = 1, \
|
|
.channel2 = IIO_MOD_##axis, \
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
|
|
BIT(IIO_CHAN_INFO_CALIBBIAS), \
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
|
|
BIT(IIO_CHAN_INFO_SCALE) | \
|
|
BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY), \
|
|
.scan_index = idx, \
|
|
.scan_type = { \
|
|
.sign = 's', \
|
|
.realbits = 12, \
|
|
.storagebits = 16, \
|
|
.shift = 4, \
|
|
.endianness = IIO_BE, \
|
|
}, \
|
|
.event_spec = mma8452_transient_event, \
|
|
.num_event_specs = ARRAY_SIZE(mma8452_transient_event), \
|
|
}
|
|
|
|
static const struct iio_chan_spec mma8452_channels[] = {
|
|
MMA8452_CHANNEL(X, 0),
|
|
MMA8452_CHANNEL(Y, 1),
|
|
MMA8452_CHANNEL(Z, 2),
|
|
IIO_CHAN_SOFT_TIMESTAMP(3),
|
|
};
|
|
|
|
static struct attribute *mma8452_attributes[] = {
|
|
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
|
|
&iio_dev_attr_in_accel_scale_available.dev_attr.attr,
|
|
&iio_dev_attr_in_accel_filter_high_pass_3db_frequency_available.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group mma8452_group = {
|
|
.attrs = mma8452_attributes,
|
|
};
|
|
|
|
static const struct iio_info mma8452_info = {
|
|
.attrs = &mma8452_group,
|
|
.read_raw = &mma8452_read_raw,
|
|
.write_raw = &mma8452_write_raw,
|
|
.event_attrs = &mma8452_event_attribute_group,
|
|
.read_event_value = &mma8452_read_thresh,
|
|
.write_event_value = &mma8452_write_thresh,
|
|
.read_event_config = &mma8452_read_event_config,
|
|
.write_event_config = &mma8452_write_event_config,
|
|
.debugfs_reg_access = &mma8452_reg_access_dbg,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static const unsigned long mma8452_scan_masks[] = {0x7, 0};
|
|
|
|
static int mma8452_data_rdy_trigger_set_state(struct iio_trigger *trig,
|
|
bool state)
|
|
{
|
|
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
|
|
struct mma8452_data *data = iio_priv(indio_dev);
|
|
int reg;
|
|
|
|
reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG4);
|
|
if (reg < 0)
|
|
return reg;
|
|
|
|
if (state)
|
|
reg |= MMA8452_INT_DRDY;
|
|
else
|
|
reg &= ~MMA8452_INT_DRDY;
|
|
|
|
return mma8452_change_config(data, MMA8452_CTRL_REG4, reg);
|
|
}
|
|
|
|
static int mma8452_validate_device(struct iio_trigger *trig,
|
|
struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_dev *indio = iio_trigger_get_drvdata(trig);
|
|
|
|
if (indio != indio_dev)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iio_trigger_ops mma8452_trigger_ops = {
|
|
.set_trigger_state = mma8452_data_rdy_trigger_set_state,
|
|
.validate_device = mma8452_validate_device,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int mma8452_trigger_setup(struct iio_dev *indio_dev)
|
|
{
|
|
struct mma8452_data *data = iio_priv(indio_dev);
|
|
struct iio_trigger *trig;
|
|
int ret;
|
|
|
|
trig = devm_iio_trigger_alloc(&data->client->dev, "%s-dev%d",
|
|
indio_dev->name,
|
|
indio_dev->id);
|
|
if (!trig)
|
|
return -ENOMEM;
|
|
|
|
trig->dev.parent = &data->client->dev;
|
|
trig->ops = &mma8452_trigger_ops;
|
|
iio_trigger_set_drvdata(trig, indio_dev);
|
|
|
|
ret = iio_trigger_register(trig);
|
|
if (ret)
|
|
return ret;
|
|
|
|
indio_dev->trig = trig;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mma8452_trigger_cleanup(struct iio_dev *indio_dev)
|
|
{
|
|
if (indio_dev->trig)
|
|
iio_trigger_unregister(indio_dev->trig);
|
|
}
|
|
|
|
static int mma8452_reset(struct i2c_client *client)
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG2,
|
|
MMA8452_CTRL_REG2_RST);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < 10; i++) {
|
|
usleep_range(100, 200);
|
|
ret = i2c_smbus_read_byte_data(client, MMA8452_CTRL_REG2);
|
|
if (ret == -EIO)
|
|
continue; /* I2C comm reset */
|
|
if (ret < 0)
|
|
return ret;
|
|
if (!(ret & MMA8452_CTRL_REG2_RST))
|
|
return 0;
|
|
}
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int mma8452_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct mma8452_data *data;
|
|
struct iio_dev *indio_dev;
|
|
int ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret != MMA8452_DEVICE_ID)
|
|
return -ENODEV;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
data = iio_priv(indio_dev);
|
|
data->client = client;
|
|
mutex_init(&data->lock);
|
|
|
|
i2c_set_clientdata(client, indio_dev);
|
|
indio_dev->info = &mma8452_info;
|
|
indio_dev->name = id->name;
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = mma8452_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(mma8452_channels);
|
|
indio_dev->available_scan_masks = mma8452_scan_masks;
|
|
|
|
ret = mma8452_reset(client);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
data->data_cfg = MMA8452_DATA_CFG_FS_2G;
|
|
ret = i2c_smbus_write_byte_data(client, MMA8452_DATA_CFG,
|
|
data->data_cfg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* By default set transient threshold to max to avoid events if
|
|
* enabling without configuring threshold.
|
|
*/
|
|
ret = i2c_smbus_write_byte_data(client, MMA8452_TRANSIENT_THS,
|
|
MMA8452_TRANSIENT_THS_MASK);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (client->irq) {
|
|
/*
|
|
* Although we enable the transient interrupt source once and
|
|
* for all here the transient event detection itself is not
|
|
* enabled until userspace asks for it by
|
|
* mma8452_write_event_config()
|
|
*/
|
|
int supported_interrupts = MMA8452_INT_DRDY | MMA8452_INT_TRANS;
|
|
int enabled_interrupts = MMA8452_INT_TRANS;
|
|
|
|
/* Assume wired to INT1 pin */
|
|
ret = i2c_smbus_write_byte_data(client,
|
|
MMA8452_CTRL_REG5,
|
|
supported_interrupts);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = i2c_smbus_write_byte_data(client,
|
|
MMA8452_CTRL_REG4,
|
|
enabled_interrupts);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = mma8452_trigger_setup(indio_dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
data->ctrl_reg1 = MMA8452_CTRL_ACTIVE |
|
|
(MMA8452_CTRL_DR_DEFAULT << MMA8452_CTRL_DR_SHIFT);
|
|
ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1,
|
|
data->ctrl_reg1);
|
|
if (ret < 0)
|
|
goto trigger_cleanup;
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, NULL,
|
|
mma8452_trigger_handler, NULL);
|
|
if (ret < 0)
|
|
goto trigger_cleanup;
|
|
|
|
if (client->irq) {
|
|
ret = devm_request_threaded_irq(&client->dev,
|
|
client->irq,
|
|
NULL, mma8452_interrupt,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
client->name, indio_dev);
|
|
if (ret)
|
|
goto buffer_cleanup;
|
|
}
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret < 0)
|
|
goto buffer_cleanup;
|
|
|
|
return 0;
|
|
|
|
buffer_cleanup:
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
|
|
trigger_cleanup:
|
|
mma8452_trigger_cleanup(indio_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mma8452_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
mma8452_trigger_cleanup(indio_dev);
|
|
mma8452_standby(iio_priv(indio_dev));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int mma8452_suspend(struct device *dev)
|
|
{
|
|
return mma8452_standby(iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev))));
|
|
}
|
|
|
|
static int mma8452_resume(struct device *dev)
|
|
{
|
|
return mma8452_active(iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev))));
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(mma8452_pm_ops, mma8452_suspend, mma8452_resume);
|
|
#define MMA8452_PM_OPS (&mma8452_pm_ops)
|
|
#else
|
|
#define MMA8452_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct i2c_device_id mma8452_id[] = {
|
|
{ "mma8452", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, mma8452_id);
|
|
|
|
static const struct of_device_id mma8452_dt_ids[] = {
|
|
{ .compatible = "fsl,mma8452" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mma8452_dt_ids);
|
|
|
|
static struct i2c_driver mma8452_driver = {
|
|
.driver = {
|
|
.name = "mma8452",
|
|
.of_match_table = of_match_ptr(mma8452_dt_ids),
|
|
.pm = MMA8452_PM_OPS,
|
|
},
|
|
.probe = mma8452_probe,
|
|
.remove = mma8452_remove,
|
|
.id_table = mma8452_id,
|
|
};
|
|
module_i2c_driver(mma8452_driver);
|
|
|
|
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
|
|
MODULE_DESCRIPTION("Freescale MMA8452 accelerometer driver");
|
|
MODULE_LICENSE("GPL");
|