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666 lines
16 KiB
666 lines
16 KiB
// 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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|
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#include <linux/acpi.h> |
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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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|
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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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s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */ |
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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, 7); |
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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->buffer); |
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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->buffer[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->buffer, |
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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)); |
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} |
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static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = { |
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.preenable = stk8312_buffer_preenable, |
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.postdisable = stk8312_buffer_postdisable, |
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}; |
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static int stk8312_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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int ret; |
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struct iio_dev *indio_dev; |
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struct stk8312_data *data; |
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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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dev_err(&client->dev, "iio allocation failed!\n"); |
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return -ENOMEM; |
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} |
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data = iio_priv(indio_dev); |
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data->client = client; |
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i2c_set_clientdata(client, indio_dev); |
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mutex_init(&data->lock); |
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indio_dev->info = &stk8312_info; |
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indio_dev->name = STK8312_DRIVER_NAME; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = stk8312_channels; |
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indio_dev->num_channels = ARRAY_SIZE(stk8312_channels); |
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|
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/* A software reset is recommended at power-on */ |
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ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00); |
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if (ret < 0) { |
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dev_err(&client->dev, "failed to reset sensor\n"); |
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return ret; |
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} |
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data->sample_rate_idx = STK8312_SR_400HZ_IDX; |
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ret = stk8312_set_range(data, STK8312_RNG_6G); |
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if (ret < 0) |
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return ret; |
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|
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ret = stk8312_set_mode(data, |
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STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE); |
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if (ret < 0) |
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return ret; |
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|
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if (client->irq > 0) { |
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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, |
|
indio_dev->id); |
|
if (!data->dready_trig) { |
|
ret = -ENOMEM; |
|
goto err_power_off; |
|
} |
|
|
|
data->dready_trig->dev.parent = &client->dev; |
|
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 int 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); |
|
|
|
return stk8312_set_mode(data, STK8312_MODE_STANDBY); |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
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 SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume); |
|
|
|
#define STK8312_PM_OPS (&stk8312_pm_ops) |
|
#else |
|
#define STK8312_PM_OPS NULL |
|
#endif |
|
|
|
static const struct i2c_device_id stk8312_i2c_id[] = { |
|
{"STK8312", 0}, |
|
{} |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id); |
|
|
|
static const struct acpi_device_id stk8312_acpi_id[] = { |
|
{"STK8312", 0}, |
|
{} |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id); |
|
|
|
static struct i2c_driver stk8312_driver = { |
|
.driver = { |
|
.name = STK8312_DRIVER_NAME, |
|
.pm = STK8312_PM_OPS, |
|
.acpi_match_table = ACPI_PTR(stk8312_acpi_id), |
|
}, |
|
.probe = stk8312_probe, |
|
.remove = stk8312_remove, |
|
.id_table = stk8312_i2c_id, |
|
}; |
|
|
|
module_i2c_driver(stk8312_driver); |
|
|
|
MODULE_AUTHOR("Tiberiu Breana <[email protected]>"); |
|
MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|