657 lines
16 KiB
C
657 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Sensortek STK8312 3-Axis Accelerometer
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*
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* Copyright (c) 2015, Intel Corporation.
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*
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* IIO driver for STK8312; 7-bit I2C address: 0x3D.
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*/
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/iio/buffer.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.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#define STK8312_REG_XOUT 0x00
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#define STK8312_REG_YOUT 0x01
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#define STK8312_REG_ZOUT 0x02
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#define STK8312_REG_INTSU 0x06
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#define STK8312_REG_MODE 0x07
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#define STK8312_REG_SR 0x08
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#define STK8312_REG_STH 0x13
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#define STK8312_REG_RESET 0x20
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#define STK8312_REG_AFECTRL 0x24
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#define STK8312_REG_OTPADDR 0x3D
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#define STK8312_REG_OTPDATA 0x3E
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#define STK8312_REG_OTPCTRL 0x3F
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#define STK8312_MODE_ACTIVE BIT(0)
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#define STK8312_MODE_STANDBY 0x00
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#define STK8312_MODE_INT_AH_PP 0xC0 /* active-high, push-pull */
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#define STK8312_DREADY_BIT BIT(4)
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#define STK8312_RNG_6G 1
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#define STK8312_RNG_SHIFT 6
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#define STK8312_RNG_MASK GENMASK(7, 6)
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#define STK8312_SR_MASK GENMASK(2, 0)
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#define STK8312_SR_400HZ_IDX 0
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#define STK8312_ALL_CHANNEL_MASK GENMASK(2, 0)
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#define STK8312_ALL_CHANNEL_SIZE 3
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#define STK8312_DRIVER_NAME "stk8312"
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#define STK8312_IRQ_NAME "stk8312_event"
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/*
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* The accelerometer has two measurement ranges:
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*
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* -6g - +6g (8-bit, signed)
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* -16g - +16g (8-bit, signed)
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*
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* scale1 = (6 + 6) * 9.81 / (2^8 - 1) = 0.4616
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* scale2 = (16 + 16) * 9.81 / (2^8 - 1) = 1.2311
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*/
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#define STK8312_SCALE_AVAIL "0.4616 1.2311"
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static const int stk8312_scale_table[][2] = {
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{0, 461600}, {1, 231100}
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};
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static const struct {
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int val;
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int val2;
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} stk8312_samp_freq_table[] = {
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{400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0},
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{12, 500000}, {6, 250000}, {3, 125000}
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};
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#define STK8312_ACCEL_CHANNEL(index, reg, axis) { \
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.type = IIO_ACCEL, \
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.address = reg, \
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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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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
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BIT(IIO_CHAN_INFO_SAMP_FREQ), \
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.scan_index = index, \
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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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.endianness = IIO_CPU, \
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}, \
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}
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static const struct iio_chan_spec stk8312_channels[] = {
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STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X),
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STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y),
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STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z),
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IIO_CHAN_SOFT_TIMESTAMP(3),
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};
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struct stk8312_data {
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struct i2c_client *client;
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struct mutex lock;
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u8 range;
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u8 sample_rate_idx;
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u8 mode;
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struct iio_trigger *dready_trig;
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bool dready_trigger_on;
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/* Ensure timestamp is naturally aligned */
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struct {
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s8 chans[3];
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s64 timestamp __aligned(8);
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} scan;
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};
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static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");
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static struct attribute *stk8312_attributes[] = {
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&iio_const_attr_in_accel_scale_available.dev_attr.attr,
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&iio_const_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 stk8312_attribute_group = {
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.attrs = stk8312_attributes
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};
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static int stk8312_otp_init(struct stk8312_data *data)
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{
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int ret;
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int count = 10;
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struct i2c_client *client = data->client;
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ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
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if (ret < 0)
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goto exit_err;
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ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
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if (ret < 0)
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goto exit_err;
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do {
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usleep_range(1000, 5000);
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ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
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if (ret < 0)
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goto exit_err;
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count--;
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} while (!(ret & BIT(7)) && count > 0);
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if (count == 0) {
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ret = -ETIMEDOUT;
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goto exit_err;
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}
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ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
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if (ret == 0)
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ret = -EINVAL;
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if (ret < 0)
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goto exit_err;
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ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret);
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if (ret < 0)
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goto exit_err;
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msleep(150);
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return 0;
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exit_err:
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dev_err(&client->dev, "failed to initialize sensor\n");
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return ret;
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}
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static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
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{
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int ret;
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struct i2c_client *client = data->client;
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if (mode == data->mode)
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return 0;
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ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
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if (ret < 0) {
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dev_err(&client->dev, "failed to change sensor mode\n");
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return ret;
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}
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data->mode = mode;
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if (mode & STK8312_MODE_ACTIVE) {
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/* Need to run OTP sequence before entering active mode */
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usleep_range(1000, 5000);
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ret = stk8312_otp_init(data);
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}
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return ret;
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}
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static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
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{
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int ret;
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u8 mode;
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struct i2c_client *client = data->client;
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mode = data->mode;
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/* We need to go in standby mode to modify registers */
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ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
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if (ret < 0) {
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dev_err(&client->dev, "failed to set interrupts\n");
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stk8312_set_mode(data, mode);
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return ret;
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}
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return stk8312_set_mode(data, mode);
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}
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static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
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bool state)
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{
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struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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struct stk8312_data *data = iio_priv(indio_dev);
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int ret;
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if (state)
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ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
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else
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ret = stk8312_set_interrupts(data, 0x00);
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if (ret < 0) {
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dev_err(&data->client->dev, "failed to set trigger state\n");
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return ret;
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}
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data->dready_trigger_on = state;
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return 0;
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}
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static const struct iio_trigger_ops stk8312_trigger_ops = {
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.set_trigger_state = stk8312_data_rdy_trigger_set_state,
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};
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static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
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{
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int ret;
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u8 masked_reg;
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u8 mode;
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struct i2c_client *client = data->client;
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if (rate == data->sample_rate_idx)
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return 0;
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mode = data->mode;
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/* We need to go in standby mode to modify registers */
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ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
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if (ret < 0)
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goto err_activate;
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masked_reg = (ret & (~STK8312_SR_MASK)) | rate;
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ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
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if (ret < 0)
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goto err_activate;
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data->sample_rate_idx = rate;
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return stk8312_set_mode(data, mode);
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err_activate:
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dev_err(&client->dev, "failed to set sampling rate\n");
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stk8312_set_mode(data, mode);
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return ret;
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}
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static int stk8312_set_range(struct stk8312_data *data, u8 range)
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{
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int ret;
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u8 masked_reg;
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u8 mode;
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struct i2c_client *client = data->client;
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if (range != 1 && range != 2)
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return -EINVAL;
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else if (range == data->range)
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return 0;
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mode = data->mode;
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/* We need to go in standby mode to modify registers */
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ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
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if (ret < 0)
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goto err_activate;
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masked_reg = ret & (~STK8312_RNG_MASK);
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masked_reg |= range << STK8312_RNG_SHIFT;
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ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
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if (ret < 0)
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goto err_activate;
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data->range = range;
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return stk8312_set_mode(data, mode);
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err_activate:
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dev_err(&client->dev, "failed to change sensor range\n");
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stk8312_set_mode(data, mode);
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return ret;
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}
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static int stk8312_read_accel(struct stk8312_data *data, u8 address)
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{
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int ret;
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struct i2c_client *client = data->client;
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if (address > 2)
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return -EINVAL;
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ret = i2c_smbus_read_byte_data(client, address);
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if (ret < 0)
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dev_err(&client->dev, "register read failed\n");
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return ret;
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}
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static int stk8312_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 stk8312_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_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 = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
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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 = stk8312_read_accel(data, chan->address);
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if (ret < 0) {
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stk8312_set_mode(data,
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data->mode & (~STK8312_MODE_ACTIVE));
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mutex_unlock(&data->lock);
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return ret;
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}
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*val = sign_extend32(ret, chan->scan_type.realbits - 1);
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ret = stk8312_set_mode(data,
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data->mode & (~STK8312_MODE_ACTIVE));
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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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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = stk8312_scale_table[data->range - 1][0];
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*val2 = stk8312_scale_table[data->range - 1][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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*val = stk8312_samp_freq_table[data->sample_rate_idx].val;
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*val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
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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 stk8312_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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int i;
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int index = -1;
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int ret;
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struct stk8312_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
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if (val == stk8312_scale_table[i][0] &&
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val2 == stk8312_scale_table[i][1]) {
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index = i + 1;
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break;
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}
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if (index < 0)
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = stk8312_set_range(data, index);
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mutex_unlock(&data->lock);
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return ret;
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case IIO_CHAN_INFO_SAMP_FREQ:
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for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
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if (val == stk8312_samp_freq_table[i].val &&
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val2 == stk8312_samp_freq_table[i].val2) {
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index = i;
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break;
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}
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if (index < 0)
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = stk8312_set_sample_rate(data, index);
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mutex_unlock(&data->lock);
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return ret;
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}
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return -EINVAL;
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}
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static const struct iio_info stk8312_info = {
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.read_raw = stk8312_read_raw,
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.write_raw = stk8312_write_raw,
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.attrs = &stk8312_attribute_group,
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};
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static irqreturn_t stk8312_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 stk8312_data *data = iio_priv(indio_dev);
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int bit, ret, i = 0;
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mutex_lock(&data->lock);
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/*
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* Do a bulk read if all channels are requested,
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* from 0x00 (XOUT) to 0x02 (ZOUT)
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*/
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if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
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ret = i2c_smbus_read_i2c_block_data(data->client,
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STK8312_REG_XOUT,
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STK8312_ALL_CHANNEL_SIZE,
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data->scan.chans);
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if (ret < STK8312_ALL_CHANNEL_SIZE) {
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dev_err(&data->client->dev, "register read failed\n");
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mutex_unlock(&data->lock);
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goto err;
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}
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} else {
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for_each_set_bit(bit, indio_dev->active_scan_mask,
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indio_dev->masklength) {
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ret = stk8312_read_accel(data, bit);
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if (ret < 0) {
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mutex_unlock(&data->lock);
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goto err;
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}
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data->scan.chans[i++] = ret;
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}
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}
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mutex_unlock(&data->lock);
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iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
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pf->timestamp);
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err:
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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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static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct stk8312_data *data = iio_priv(indio_dev);
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if (data->dready_trigger_on)
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iio_trigger_poll(data->dready_trig);
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return IRQ_HANDLED;
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}
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static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
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{
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struct stk8312_data *data = iio_priv(indio_dev);
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return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
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}
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static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
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{
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struct stk8312_data *data = iio_priv(indio_dev);
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return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
|
|
}
|
|
|
|
static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
|
|
.preenable = stk8312_buffer_preenable,
|
|
.postdisable = stk8312_buffer_postdisable,
|
|
};
|
|
|
|
static int stk8312_probe(struct i2c_client *client)
|
|
{
|
|
int ret;
|
|
struct iio_dev *indio_dev;
|
|
struct stk8312_data *data;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (!indio_dev) {
|
|
dev_err(&client->dev, "iio allocation failed!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
data = iio_priv(indio_dev);
|
|
data->client = client;
|
|
i2c_set_clientdata(client, indio_dev);
|
|
mutex_init(&data->lock);
|
|
|
|
indio_dev->info = &stk8312_info;
|
|
indio_dev->name = STK8312_DRIVER_NAME;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = stk8312_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);
|
|
|
|
/* A software reset is recommended at power-on */
|
|
ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "failed to reset sensor\n");
|
|
return ret;
|
|
}
|
|
data->sample_rate_idx = STK8312_SR_400HZ_IDX;
|
|
ret = stk8312_set_range(data, STK8312_RNG_6G);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = stk8312_set_mode(data,
|
|
STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (client->irq > 0) {
|
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
|
stk8312_data_rdy_trig_poll,
|
|
NULL,
|
|
IRQF_TRIGGER_RISING |
|
|
IRQF_ONESHOT,
|
|
STK8312_IRQ_NAME,
|
|
indio_dev);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "request irq %d failed\n",
|
|
client->irq);
|
|
goto err_power_off;
|
|
}
|
|
|
|
data->dready_trig = devm_iio_trigger_alloc(&client->dev,
|
|
"%s-dev%d",
|
|
indio_dev->name,
|
|
iio_device_id(indio_dev));
|
|
if (!data->dready_trig) {
|
|
ret = -ENOMEM;
|
|
goto err_power_off;
|
|
}
|
|
|
|
data->dready_trig->ops = &stk8312_trigger_ops;
|
|
iio_trigger_set_drvdata(data->dready_trig, indio_dev);
|
|
ret = iio_trigger_register(data->dready_trig);
|
|
if (ret) {
|
|
dev_err(&client->dev, "iio trigger register failed\n");
|
|
goto err_power_off;
|
|
}
|
|
}
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev,
|
|
iio_pollfunc_store_time,
|
|
stk8312_trigger_handler,
|
|
&stk8312_buffer_setup_ops);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "iio triggered buffer setup failed\n");
|
|
goto err_trigger_unregister;
|
|
}
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "device_register failed\n");
|
|
goto err_buffer_cleanup;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_buffer_cleanup:
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
err_trigger_unregister:
|
|
if (data->dready_trig)
|
|
iio_trigger_unregister(data->dready_trig);
|
|
err_power_off:
|
|
stk8312_set_mode(data, STK8312_MODE_STANDBY);
|
|
return ret;
|
|
}
|
|
|
|
static void stk8312_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
struct stk8312_data *data = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
|
|
if (data->dready_trig)
|
|
iio_trigger_unregister(data->dready_trig);
|
|
|
|
stk8312_set_mode(data, STK8312_MODE_STANDBY);
|
|
}
|
|
|
|
static int stk8312_suspend(struct device *dev)
|
|
{
|
|
struct stk8312_data *data;
|
|
|
|
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
|
|
|
|
return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
|
|
}
|
|
|
|
static int stk8312_resume(struct device *dev)
|
|
{
|
|
struct stk8312_data *data;
|
|
|
|
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
|
|
|
|
return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
|
|
}
|
|
|
|
static DEFINE_SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend,
|
|
stk8312_resume);
|
|
|
|
static const struct i2c_device_id stk8312_i2c_id[] = {
|
|
/* Deprecated in favour of lowercase form */
|
|
{ "STK8312", 0 },
|
|
{ "stk8312", 0 },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);
|
|
|
|
static struct i2c_driver stk8312_driver = {
|
|
.driver = {
|
|
.name = STK8312_DRIVER_NAME,
|
|
.pm = pm_sleep_ptr(&stk8312_pm_ops),
|
|
},
|
|
.probe = stk8312_probe,
|
|
.remove = stk8312_remove,
|
|
.id_table = stk8312_i2c_id,
|
|
};
|
|
|
|
module_i2c_driver(stk8312_driver);
|
|
|
|
MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
|
|
MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
|
|
MODULE_LICENSE("GPL v2");
|