635 строки
15 KiB
C
635 строки
15 KiB
C
/*
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* Freescale MMA9551L Intelligent Motion-Sensing Platform driver
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* Copyright (c) 2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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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/interrupt.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.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/events.h>
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#include <linux/pm_runtime.h>
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#include "mma9551_core.h"
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#define MMA9551_DRV_NAME "mma9551"
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#define MMA9551_IRQ_NAME "mma9551_event"
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#define MMA9551_GPIO_COUNT 4
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/* Tilt application (inclination in IIO terms). */
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#define MMA9551_TILT_XZ_ANG_REG 0x00
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#define MMA9551_TILT_YZ_ANG_REG 0x01
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#define MMA9551_TILT_XY_ANG_REG 0x02
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#define MMA9551_TILT_ANGFLG BIT(7)
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#define MMA9551_TILT_QUAD_REG 0x03
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#define MMA9551_TILT_XY_QUAD_SHIFT 0
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#define MMA9551_TILT_YZ_QUAD_SHIFT 2
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#define MMA9551_TILT_XZ_QUAD_SHIFT 4
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#define MMA9551_TILT_CFG_REG 0x01
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#define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
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#define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
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/* Tilt events are mapped to the first three GPIO pins. */
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enum mma9551_tilt_axis {
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mma9551_x = 0,
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mma9551_y,
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mma9551_z,
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};
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struct mma9551_data {
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struct i2c_client *client;
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struct mutex mutex;
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int event_enabled[3];
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int irqs[MMA9551_GPIO_COUNT];
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};
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static int mma9551_read_incli_chan(struct i2c_client *client,
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const struct iio_chan_spec *chan,
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int *val)
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{
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u8 quad_shift, angle, quadrant;
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u16 reg_addr;
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int ret;
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switch (chan->channel2) {
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case IIO_MOD_X:
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reg_addr = MMA9551_TILT_YZ_ANG_REG;
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quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
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break;
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case IIO_MOD_Y:
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reg_addr = MMA9551_TILT_XZ_ANG_REG;
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quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
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break;
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case IIO_MOD_Z:
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reg_addr = MMA9551_TILT_XY_ANG_REG;
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quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
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break;
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default:
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return -EINVAL;
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}
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ret = mma9551_set_power_state(client, true);
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if (ret < 0)
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return ret;
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ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
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reg_addr, &angle);
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if (ret < 0)
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goto out_poweroff;
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ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
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MMA9551_TILT_QUAD_REG, &quadrant);
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if (ret < 0)
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goto out_poweroff;
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angle &= ~MMA9551_TILT_ANGFLG;
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quadrant = (quadrant >> quad_shift) & 0x03;
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if (quadrant == 1 || quadrant == 3)
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*val = 90 * (quadrant + 1) - angle;
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else
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*val = angle + 90 * quadrant;
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ret = IIO_VAL_INT;
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out_poweroff:
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mma9551_set_power_state(client, false);
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return ret;
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}
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static int mma9551_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 mma9551_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_PROCESSED:
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switch (chan->type) {
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case IIO_INCLI:
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mutex_lock(&data->mutex);
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ret = mma9551_read_incli_chan(data->client, chan, val);
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mutex_unlock(&data->mutex);
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return ret;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_RAW:
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switch (chan->type) {
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case IIO_ACCEL:
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mutex_lock(&data->mutex);
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ret = mma9551_read_accel_chan(data->client,
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chan, val, val2);
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mutex_unlock(&data->mutex);
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return ret;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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case IIO_ACCEL:
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return mma9551_read_accel_scale(val, val2);
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default:
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return -EINVAL;
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}
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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 mma9551_read_event_config(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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{
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struct mma9551_data *data = iio_priv(indio_dev);
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switch (chan->type) {
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case IIO_INCLI:
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/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
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return data->event_enabled[chan->channel2 - 1];
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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 mma9551_config_incli_event(struct iio_dev *indio_dev,
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enum iio_modifier axis,
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int state)
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{
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struct mma9551_data *data = iio_priv(indio_dev);
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enum mma9551_tilt_axis mma_axis;
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int ret;
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/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
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mma_axis = axis - 1;
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if (data->event_enabled[mma_axis] == state)
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return 0;
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if (state == 0) {
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ret = mma9551_gpio_config(data->client,
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(enum mma9551_gpio_pin)mma_axis,
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MMA9551_APPID_NONE, 0, 0);
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if (ret < 0)
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return ret;
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ret = mma9551_set_power_state(data->client, false);
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if (ret < 0)
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return ret;
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} else {
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int bitnum;
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/* Bit 7 of each angle register holds the angle flag. */
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switch (axis) {
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case IIO_MOD_X:
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bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
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break;
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case IIO_MOD_Y:
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bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
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break;
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case IIO_MOD_Z:
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bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
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break;
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default:
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return -EINVAL;
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}
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ret = mma9551_set_power_state(data->client, true);
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if (ret < 0)
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return ret;
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ret = mma9551_gpio_config(data->client,
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(enum mma9551_gpio_pin)mma_axis,
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MMA9551_APPID_TILT, bitnum, 0);
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if (ret < 0) {
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mma9551_set_power_state(data->client, false);
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return ret;
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}
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}
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data->event_enabled[mma_axis] = state;
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return ret;
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}
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static int mma9551_write_event_config(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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int state)
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{
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struct mma9551_data *data = iio_priv(indio_dev);
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int ret;
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switch (chan->type) {
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case IIO_INCLI:
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mutex_lock(&data->mutex);
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ret = mma9551_config_incli_event(indio_dev,
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chan->channel2, state);
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mutex_unlock(&data->mutex);
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return ret;
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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 mma9551_write_event_value(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 mma9551_data *data = iio_priv(indio_dev);
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int ret;
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switch (chan->type) {
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case IIO_INCLI:
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if (val2 != 0 || val < 1 || val > 10)
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return -EINVAL;
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mutex_lock(&data->mutex);
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ret = mma9551_update_config_bits(data->client,
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MMA9551_APPID_TILT,
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MMA9551_TILT_CFG_REG,
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MMA9551_TILT_ANG_THRESH_MASK,
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val);
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mutex_unlock(&data->mutex);
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return ret;
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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 mma9551_read_event_value(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 mma9551_data *data = iio_priv(indio_dev);
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int ret;
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u8 tmp;
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switch (chan->type) {
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case IIO_INCLI:
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mutex_lock(&data->mutex);
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ret = mma9551_read_config_byte(data->client,
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MMA9551_APPID_TILT,
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MMA9551_TILT_CFG_REG, &tmp);
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mutex_unlock(&data->mutex);
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if (ret < 0)
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return ret;
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*val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
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*val2 = 0;
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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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}
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static const struct iio_event_spec mma9551_incli_event = {
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.type = IIO_EV_TYPE_ROC,
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.dir = IIO_EV_DIR_RISING,
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.mask_separate = BIT(IIO_EV_INFO_ENABLE),
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.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
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};
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#define MMA9551_INCLI_CHANNEL(axis) { \
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.type = IIO_INCLI, \
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.modified = 1, \
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.channel2 = axis, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
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.event_spec = &mma9551_incli_event, \
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.num_event_specs = 1, \
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}
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static const struct iio_chan_spec mma9551_channels[] = {
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MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
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MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
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MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
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MMA9551_INCLI_CHANNEL(IIO_MOD_X),
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MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
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MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
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};
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static const struct iio_info mma9551_info = {
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.read_raw = mma9551_read_raw,
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.read_event_config = mma9551_read_event_config,
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.write_event_config = mma9551_write_event_config,
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.read_event_value = mma9551_read_event_value,
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.write_event_value = mma9551_write_event_value,
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};
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static irqreturn_t mma9551_event_handler(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct mma9551_data *data = iio_priv(indio_dev);
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int i, ret, mma_axis = -1;
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u16 reg;
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u8 val;
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mutex_lock(&data->mutex);
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for (i = 0; i < 3; i++)
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if (irq == data->irqs[i]) {
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mma_axis = i;
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break;
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}
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if (mma_axis == -1) {
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/* IRQ was triggered on 4th line, which we don't use. */
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dev_warn(&data->client->dev,
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"irq triggered on unused line %d\n", data->irqs[3]);
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goto out;
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}
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switch (mma_axis) {
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case mma9551_x:
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reg = MMA9551_TILT_YZ_ANG_REG;
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break;
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case mma9551_y:
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reg = MMA9551_TILT_XZ_ANG_REG;
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break;
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case mma9551_z:
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reg = MMA9551_TILT_XY_ANG_REG;
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break;
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}
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/*
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* Read the angle even though we don't use it, otherwise we
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* won't get any further interrupts.
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*/
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ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
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reg, &val);
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if (ret < 0) {
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dev_err(&data->client->dev,
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"error %d reading tilt register in IRQ\n", ret);
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goto out;
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}
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iio_push_event(indio_dev,
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IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
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IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
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iio_get_time_ns(indio_dev));
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out:
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mutex_unlock(&data->mutex);
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return IRQ_HANDLED;
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}
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static int mma9551_init(struct mma9551_data *data)
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{
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int ret;
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ret = mma9551_read_version(data->client);
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if (ret)
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return ret;
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return mma9551_set_device_state(data->client, true);
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}
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static int mma9551_gpio_probe(struct iio_dev *indio_dev)
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{
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struct gpio_desc *gpio;
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int i, ret;
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struct mma9551_data *data = iio_priv(indio_dev);
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struct device *dev = &data->client->dev;
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for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
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gpio = devm_gpiod_get_index(dev, NULL, i, GPIOD_IN);
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if (IS_ERR(gpio)) {
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dev_err(dev, "acpi gpio get index failed\n");
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return PTR_ERR(gpio);
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}
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ret = gpiod_to_irq(gpio);
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if (ret < 0)
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return ret;
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data->irqs[i] = ret;
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ret = devm_request_threaded_irq(dev, data->irqs[i],
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NULL, mma9551_event_handler,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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MMA9551_IRQ_NAME, indio_dev);
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if (ret < 0) {
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dev_err(dev, "request irq %d failed\n", data->irqs[i]);
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return ret;
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}
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dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
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desc_to_gpio(gpio), data->irqs[i]);
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}
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return 0;
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}
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static const char *mma9551_match_acpi_device(struct device *dev)
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{
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const struct acpi_device_id *id;
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id = acpi_match_device(dev->driver->acpi_match_table, dev);
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if (!id)
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return NULL;
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return dev_name(dev);
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}
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static int mma9551_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct mma9551_data *data;
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struct iio_dev *indio_dev;
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const char *name = NULL;
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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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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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if (id)
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name = id->name;
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else if (ACPI_HANDLE(&client->dev))
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name = mma9551_match_acpi_device(&client->dev);
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ret = mma9551_init(data);
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if (ret < 0)
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return ret;
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mutex_init(&data->mutex);
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indio_dev->dev.parent = &client->dev;
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indio_dev->channels = mma9551_channels;
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indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
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indio_dev->name = name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &mma9551_info;
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ret = mma9551_gpio_probe(indio_dev);
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if (ret < 0)
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goto out_poweroff;
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ret = pm_runtime_set_active(&client->dev);
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if (ret < 0)
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goto out_poweroff;
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pm_runtime_enable(&client->dev);
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pm_runtime_set_autosuspend_delay(&client->dev,
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MMA9551_AUTO_SUSPEND_DELAY_MS);
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pm_runtime_use_autosuspend(&client->dev);
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ret = iio_device_register(indio_dev);
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if (ret < 0) {
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dev_err(&client->dev, "unable to register iio device\n");
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goto out_poweroff;
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}
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return 0;
|
|
|
|
out_poweroff:
|
|
mma9551_set_device_state(client, false);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mma9551_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
struct mma9551_data *data = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
pm_runtime_disable(&client->dev);
|
|
pm_runtime_set_suspended(&client->dev);
|
|
pm_runtime_put_noidle(&client->dev);
|
|
|
|
mutex_lock(&data->mutex);
|
|
mma9551_set_device_state(data->client, false);
|
|
mutex_unlock(&data->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int mma9551_runtime_suspend(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
struct mma9551_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&data->mutex);
|
|
ret = mma9551_set_device_state(data->client, false);
|
|
mutex_unlock(&data->mutex);
|
|
if (ret < 0) {
|
|
dev_err(&data->client->dev, "powering off device failed\n");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mma9551_runtime_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
struct mma9551_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = mma9551_set_device_state(data->client, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
mma9551_sleep(MMA9551_DEFAULT_SAMPLE_RATE);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int mma9551_suspend(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
struct mma9551_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&data->mutex);
|
|
ret = mma9551_set_device_state(data->client, false);
|
|
mutex_unlock(&data->mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mma9551_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
struct mma9551_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&data->mutex);
|
|
ret = mma9551_set_device_state(data->client, true);
|
|
mutex_unlock(&data->mutex);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static const struct dev_pm_ops mma9551_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
|
|
SET_RUNTIME_PM_OPS(mma9551_runtime_suspend,
|
|
mma9551_runtime_resume, NULL)
|
|
};
|
|
|
|
static const struct acpi_device_id mma9551_acpi_match[] = {
|
|
{"MMA9551", 0},
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
|
|
|
|
static const struct i2c_device_id mma9551_id[] = {
|
|
{"mma9551", 0},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, mma9551_id);
|
|
|
|
static struct i2c_driver mma9551_driver = {
|
|
.driver = {
|
|
.name = MMA9551_DRV_NAME,
|
|
.acpi_match_table = ACPI_PTR(mma9551_acpi_match),
|
|
.pm = &mma9551_pm_ops,
|
|
},
|
|
.probe = mma9551_probe,
|
|
.remove = mma9551_remove,
|
|
.id_table = mma9551_id,
|
|
};
|
|
|
|
module_i2c_driver(mma9551_driver);
|
|
|
|
MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
|
|
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");
|