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1085 lines
27 KiB
1085 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Bosch BMC150 three-axis magnetic field sensor driver |
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* |
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* Copyright (c) 2015, Intel Corporation. |
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* |
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* This code is based on bmm050_api.c authored by [email protected]: |
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* |
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* (C) Copyright 2011~2014 Bosch Sensortec GmbH All Rights Reserved |
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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/delay.h> |
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#include <linux/slab.h> |
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#include <linux/acpi.h> |
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#include <linux/pm.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/events.h> |
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#include <linux/iio/trigger.h> |
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#include <linux/iio/trigger_consumer.h> |
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#include <linux/iio/triggered_buffer.h> |
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#include <linux/regmap.h> |
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#include <linux/regulator/consumer.h> |
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#include "bmc150_magn.h" |
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#define BMC150_MAGN_DRV_NAME "bmc150_magn" |
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#define BMC150_MAGN_IRQ_NAME "bmc150_magn_event" |
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#define BMC150_MAGN_REG_CHIP_ID 0x40 |
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#define BMC150_MAGN_CHIP_ID_VAL 0x32 |
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#define BMC150_MAGN_REG_X_L 0x42 |
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#define BMC150_MAGN_REG_X_M 0x43 |
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#define BMC150_MAGN_REG_Y_L 0x44 |
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#define BMC150_MAGN_REG_Y_M 0x45 |
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#define BMC150_MAGN_SHIFT_XY_L 3 |
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#define BMC150_MAGN_REG_Z_L 0x46 |
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#define BMC150_MAGN_REG_Z_M 0x47 |
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#define BMC150_MAGN_SHIFT_Z_L 1 |
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#define BMC150_MAGN_REG_RHALL_L 0x48 |
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#define BMC150_MAGN_REG_RHALL_M 0x49 |
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#define BMC150_MAGN_SHIFT_RHALL_L 2 |
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#define BMC150_MAGN_REG_INT_STATUS 0x4A |
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#define BMC150_MAGN_REG_POWER 0x4B |
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#define BMC150_MAGN_MASK_POWER_CTL BIT(0) |
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#define BMC150_MAGN_REG_OPMODE_ODR 0x4C |
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#define BMC150_MAGN_MASK_OPMODE GENMASK(2, 1) |
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#define BMC150_MAGN_SHIFT_OPMODE 1 |
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#define BMC150_MAGN_MODE_NORMAL 0x00 |
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#define BMC150_MAGN_MODE_FORCED 0x01 |
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#define BMC150_MAGN_MODE_SLEEP 0x03 |
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#define BMC150_MAGN_MASK_ODR GENMASK(5, 3) |
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#define BMC150_MAGN_SHIFT_ODR 3 |
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#define BMC150_MAGN_REG_INT 0x4D |
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#define BMC150_MAGN_REG_INT_DRDY 0x4E |
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#define BMC150_MAGN_MASK_DRDY_EN BIT(7) |
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#define BMC150_MAGN_SHIFT_DRDY_EN 7 |
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#define BMC150_MAGN_MASK_DRDY_INT3 BIT(6) |
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#define BMC150_MAGN_MASK_DRDY_Z_EN BIT(5) |
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#define BMC150_MAGN_MASK_DRDY_Y_EN BIT(4) |
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#define BMC150_MAGN_MASK_DRDY_X_EN BIT(3) |
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#define BMC150_MAGN_MASK_DRDY_DR_POLARITY BIT(2) |
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#define BMC150_MAGN_MASK_DRDY_LATCHING BIT(1) |
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#define BMC150_MAGN_MASK_DRDY_INT3_POLARITY BIT(0) |
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#define BMC150_MAGN_REG_LOW_THRESH 0x4F |
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#define BMC150_MAGN_REG_HIGH_THRESH 0x50 |
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#define BMC150_MAGN_REG_REP_XY 0x51 |
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#define BMC150_MAGN_REG_REP_Z 0x52 |
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#define BMC150_MAGN_REG_REP_DATAMASK GENMASK(7, 0) |
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#define BMC150_MAGN_REG_TRIM_START 0x5D |
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#define BMC150_MAGN_REG_TRIM_END 0x71 |
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#define BMC150_MAGN_XY_OVERFLOW_VAL -4096 |
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#define BMC150_MAGN_Z_OVERFLOW_VAL -16384 |
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/* Time from SUSPEND to SLEEP */ |
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#define BMC150_MAGN_START_UP_TIME_MS 3 |
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#define BMC150_MAGN_AUTO_SUSPEND_DELAY_MS 2000 |
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#define BMC150_MAGN_REGVAL_TO_REPXY(regval) (((regval) * 2) + 1) |
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#define BMC150_MAGN_REGVAL_TO_REPZ(regval) ((regval) + 1) |
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#define BMC150_MAGN_REPXY_TO_REGVAL(rep) (((rep) - 1) / 2) |
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#define BMC150_MAGN_REPZ_TO_REGVAL(rep) ((rep) - 1) |
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enum bmc150_magn_axis { |
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AXIS_X, |
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AXIS_Y, |
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AXIS_Z, |
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RHALL, |
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AXIS_XYZ_MAX = RHALL, |
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AXIS_XYZR_MAX, |
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}; |
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enum bmc150_magn_power_modes { |
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BMC150_MAGN_POWER_MODE_SUSPEND, |
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BMC150_MAGN_POWER_MODE_SLEEP, |
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BMC150_MAGN_POWER_MODE_NORMAL, |
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}; |
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struct bmc150_magn_trim_regs { |
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s8 x1; |
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s8 y1; |
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__le16 reserved1; |
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u8 reserved2; |
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__le16 z4; |
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s8 x2; |
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s8 y2; |
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__le16 reserved3; |
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__le16 z2; |
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__le16 z1; |
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__le16 xyz1; |
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__le16 z3; |
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s8 xy2; |
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u8 xy1; |
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} __packed; |
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struct bmc150_magn_data { |
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struct device *dev; |
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/* |
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* 1. Protect this structure. |
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* 2. Serialize sequences that power on/off the device and access HW. |
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*/ |
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struct mutex mutex; |
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struct regmap *regmap; |
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struct regulator_bulk_data regulators[2]; |
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struct iio_mount_matrix orientation; |
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/* 4 x 32 bits for x, y z, 4 bytes align, 64 bits timestamp */ |
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s32 buffer[6]; |
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struct iio_trigger *dready_trig; |
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bool dready_trigger_on; |
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int max_odr; |
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int irq; |
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}; |
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static const struct { |
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int freq; |
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u8 reg_val; |
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} bmc150_magn_samp_freq_table[] = { {2, 0x01}, |
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{6, 0x02}, |
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{8, 0x03}, |
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{10, 0x00}, |
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{15, 0x04}, |
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{20, 0x05}, |
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{25, 0x06}, |
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{30, 0x07} }; |
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enum bmc150_magn_presets { |
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LOW_POWER_PRESET, |
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REGULAR_PRESET, |
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ENHANCED_REGULAR_PRESET, |
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HIGH_ACCURACY_PRESET |
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}; |
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static const struct bmc150_magn_preset { |
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u8 rep_xy; |
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u8 rep_z; |
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u8 odr; |
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} bmc150_magn_presets_table[] = { |
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[LOW_POWER_PRESET] = {3, 3, 10}, |
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[REGULAR_PRESET] = {9, 15, 10}, |
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[ENHANCED_REGULAR_PRESET] = {15, 27, 10}, |
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[HIGH_ACCURACY_PRESET] = {47, 83, 20}, |
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}; |
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#define BMC150_MAGN_DEFAULT_PRESET REGULAR_PRESET |
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static bool bmc150_magn_is_writeable_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case BMC150_MAGN_REG_POWER: |
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case BMC150_MAGN_REG_OPMODE_ODR: |
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case BMC150_MAGN_REG_INT: |
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case BMC150_MAGN_REG_INT_DRDY: |
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case BMC150_MAGN_REG_LOW_THRESH: |
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case BMC150_MAGN_REG_HIGH_THRESH: |
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case BMC150_MAGN_REG_REP_XY: |
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case BMC150_MAGN_REG_REP_Z: |
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return true; |
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default: |
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return false; |
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} |
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} |
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static bool bmc150_magn_is_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case BMC150_MAGN_REG_X_L: |
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case BMC150_MAGN_REG_X_M: |
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case BMC150_MAGN_REG_Y_L: |
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case BMC150_MAGN_REG_Y_M: |
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case BMC150_MAGN_REG_Z_L: |
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case BMC150_MAGN_REG_Z_M: |
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case BMC150_MAGN_REG_RHALL_L: |
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case BMC150_MAGN_REG_RHALL_M: |
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case BMC150_MAGN_REG_INT_STATUS: |
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return true; |
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default: |
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return false; |
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} |
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} |
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const struct regmap_config bmc150_magn_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = BMC150_MAGN_REG_TRIM_END, |
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.cache_type = REGCACHE_RBTREE, |
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.writeable_reg = bmc150_magn_is_writeable_reg, |
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.volatile_reg = bmc150_magn_is_volatile_reg, |
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}; |
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EXPORT_SYMBOL(bmc150_magn_regmap_config); |
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static int bmc150_magn_set_power_mode(struct bmc150_magn_data *data, |
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enum bmc150_magn_power_modes mode, |
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bool state) |
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{ |
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int ret; |
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switch (mode) { |
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case BMC150_MAGN_POWER_MODE_SUSPEND: |
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ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_POWER, |
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BMC150_MAGN_MASK_POWER_CTL, !state); |
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if (ret < 0) |
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return ret; |
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usleep_range(BMC150_MAGN_START_UP_TIME_MS * 1000, 20000); |
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return 0; |
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case BMC150_MAGN_POWER_MODE_SLEEP: |
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return regmap_update_bits(data->regmap, |
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BMC150_MAGN_REG_OPMODE_ODR, |
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BMC150_MAGN_MASK_OPMODE, |
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BMC150_MAGN_MODE_SLEEP << |
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BMC150_MAGN_SHIFT_OPMODE); |
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case BMC150_MAGN_POWER_MODE_NORMAL: |
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return regmap_update_bits(data->regmap, |
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BMC150_MAGN_REG_OPMODE_ODR, |
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BMC150_MAGN_MASK_OPMODE, |
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BMC150_MAGN_MODE_NORMAL << |
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BMC150_MAGN_SHIFT_OPMODE); |
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} |
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return -EINVAL; |
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} |
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static int bmc150_magn_set_power_state(struct bmc150_magn_data *data, bool on) |
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{ |
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#ifdef CONFIG_PM |
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int ret; |
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if (on) { |
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ret = pm_runtime_get_sync(data->dev); |
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} else { |
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pm_runtime_mark_last_busy(data->dev); |
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ret = pm_runtime_put_autosuspend(data->dev); |
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} |
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if (ret < 0) { |
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dev_err(data->dev, |
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"failed to change power state to %d\n", on); |
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if (on) |
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pm_runtime_put_noidle(data->dev); |
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return ret; |
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} |
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#endif |
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return 0; |
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} |
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static int bmc150_magn_get_odr(struct bmc150_magn_data *data, int *val) |
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{ |
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int ret, reg_val; |
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u8 i, odr_val; |
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ret = regmap_read(data->regmap, BMC150_MAGN_REG_OPMODE_ODR, ®_val); |
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if (ret < 0) |
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return ret; |
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odr_val = (reg_val & BMC150_MAGN_MASK_ODR) >> BMC150_MAGN_SHIFT_ODR; |
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for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) |
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if (bmc150_magn_samp_freq_table[i].reg_val == odr_val) { |
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*val = bmc150_magn_samp_freq_table[i].freq; |
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return 0; |
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} |
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return -EINVAL; |
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} |
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static int bmc150_magn_set_odr(struct bmc150_magn_data *data, int val) |
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{ |
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int ret; |
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u8 i; |
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for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) { |
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if (bmc150_magn_samp_freq_table[i].freq == val) { |
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ret = regmap_update_bits(data->regmap, |
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BMC150_MAGN_REG_OPMODE_ODR, |
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BMC150_MAGN_MASK_ODR, |
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bmc150_magn_samp_freq_table[i]. |
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reg_val << |
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BMC150_MAGN_SHIFT_ODR); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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} |
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return -EINVAL; |
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} |
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static int bmc150_magn_set_max_odr(struct bmc150_magn_data *data, int rep_xy, |
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int rep_z, int odr) |
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{ |
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int ret, reg_val, max_odr; |
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if (rep_xy <= 0) { |
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ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY, |
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®_val); |
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if (ret < 0) |
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return ret; |
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rep_xy = BMC150_MAGN_REGVAL_TO_REPXY(reg_val); |
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} |
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if (rep_z <= 0) { |
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ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z, |
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®_val); |
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if (ret < 0) |
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return ret; |
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rep_z = BMC150_MAGN_REGVAL_TO_REPZ(reg_val); |
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} |
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if (odr <= 0) { |
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ret = bmc150_magn_get_odr(data, &odr); |
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if (ret < 0) |
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return ret; |
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} |
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/* the maximum selectable read-out frequency from datasheet */ |
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max_odr = 1000000 / (145 * rep_xy + 500 * rep_z + 980); |
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if (odr > max_odr) { |
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dev_err(data->dev, |
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"Can't set oversampling with sampling freq %d\n", |
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odr); |
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return -EINVAL; |
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} |
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data->max_odr = max_odr; |
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return 0; |
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} |
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static s32 bmc150_magn_compensate_x(struct bmc150_magn_trim_regs *tregs, s16 x, |
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u16 rhall) |
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{ |
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s16 val; |
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u16 xyz1 = le16_to_cpu(tregs->xyz1); |
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if (x == BMC150_MAGN_XY_OVERFLOW_VAL) |
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return S32_MIN; |
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if (!rhall) |
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rhall = xyz1; |
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val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000))); |
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val = ((s16)((((s32)x) * ((((((((s32)tregs->xy2) * ((((s32)val) * |
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((s32)val)) >> 7)) + (((s32)val) * |
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((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) * |
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((s32)(((s16)tregs->x2) + ((s16)0xA0)))) >> 12)) >> 13)) + |
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(((s16)tregs->x1) << 3); |
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return (s32)val; |
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} |
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static s32 bmc150_magn_compensate_y(struct bmc150_magn_trim_regs *tregs, s16 y, |
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u16 rhall) |
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{ |
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s16 val; |
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u16 xyz1 = le16_to_cpu(tregs->xyz1); |
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if (y == BMC150_MAGN_XY_OVERFLOW_VAL) |
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return S32_MIN; |
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if (!rhall) |
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rhall = xyz1; |
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val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000))); |
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val = ((s16)((((s32)y) * ((((((((s32)tregs->xy2) * ((((s32)val) * |
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((s32)val)) >> 7)) + (((s32)val) * |
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((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) * |
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((s32)(((s16)tregs->y2) + ((s16)0xA0)))) >> 12)) >> 13)) + |
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(((s16)tregs->y1) << 3); |
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|
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return (s32)val; |
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} |
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static s32 bmc150_magn_compensate_z(struct bmc150_magn_trim_regs *tregs, s16 z, |
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u16 rhall) |
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{ |
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s32 val; |
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u16 xyz1 = le16_to_cpu(tregs->xyz1); |
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u16 z1 = le16_to_cpu(tregs->z1); |
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s16 z2 = le16_to_cpu(tregs->z2); |
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s16 z3 = le16_to_cpu(tregs->z3); |
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s16 z4 = le16_to_cpu(tregs->z4); |
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if (z == BMC150_MAGN_Z_OVERFLOW_VAL) |
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return S32_MIN; |
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|
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val = (((((s32)(z - z4)) << 15) - ((((s32)z3) * ((s32)(((s16)rhall) - |
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((s16)xyz1)))) >> 2)) / (z2 + ((s16)(((((s32)z1) * |
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((((s16)rhall) << 1))) + (1 << 15)) >> 16)))); |
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|
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return val; |
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} |
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static int bmc150_magn_read_xyz(struct bmc150_magn_data *data, s32 *buffer) |
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{ |
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int ret; |
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__le16 values[AXIS_XYZR_MAX]; |
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s16 raw_x, raw_y, raw_z; |
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u16 rhall; |
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struct bmc150_magn_trim_regs tregs; |
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|
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ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_X_L, |
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values, sizeof(values)); |
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if (ret < 0) |
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return ret; |
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|
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raw_x = (s16)le16_to_cpu(values[AXIS_X]) >> BMC150_MAGN_SHIFT_XY_L; |
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raw_y = (s16)le16_to_cpu(values[AXIS_Y]) >> BMC150_MAGN_SHIFT_XY_L; |
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raw_z = (s16)le16_to_cpu(values[AXIS_Z]) >> BMC150_MAGN_SHIFT_Z_L; |
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rhall = le16_to_cpu(values[RHALL]) >> BMC150_MAGN_SHIFT_RHALL_L; |
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|
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ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_TRIM_START, |
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&tregs, sizeof(tregs)); |
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if (ret < 0) |
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return ret; |
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|
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buffer[AXIS_X] = bmc150_magn_compensate_x(&tregs, raw_x, rhall); |
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buffer[AXIS_Y] = bmc150_magn_compensate_y(&tregs, raw_y, rhall); |
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buffer[AXIS_Z] = bmc150_magn_compensate_z(&tregs, raw_z, rhall); |
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|
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return 0; |
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} |
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|
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static int bmc150_magn_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 bmc150_magn_data *data = iio_priv(indio_dev); |
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int ret, tmp; |
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s32 values[AXIS_XYZ_MAX]; |
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|
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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->mutex); |
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|
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ret = bmc150_magn_set_power_state(data, true); |
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if (ret < 0) { |
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mutex_unlock(&data->mutex); |
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return ret; |
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} |
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|
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ret = bmc150_magn_read_xyz(data, values); |
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if (ret < 0) { |
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bmc150_magn_set_power_state(data, false); |
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mutex_unlock(&data->mutex); |
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return ret; |
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} |
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*val = values[chan->scan_index]; |
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|
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ret = bmc150_magn_set_power_state(data, false); |
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if (ret < 0) { |
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mutex_unlock(&data->mutex); |
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return ret; |
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} |
|
|
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mutex_unlock(&data->mutex); |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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/* |
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* The API/driver performs an off-chip temperature |
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* compensation and outputs x/y/z magnetic field data in |
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* 16 LSB/uT to the upper application layer. |
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*/ |
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*val = 0; |
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*val2 = 625; |
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return IIO_VAL_INT_PLUS_MICRO; |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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ret = bmc150_magn_get_odr(data, val); |
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if (ret < 0) |
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return ret; |
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return IIO_VAL_INT; |
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
|
switch (chan->channel2) { |
|
case IIO_MOD_X: |
|
case IIO_MOD_Y: |
|
ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY, |
|
&tmp); |
|
if (ret < 0) |
|
return ret; |
|
*val = BMC150_MAGN_REGVAL_TO_REPXY(tmp); |
|
return IIO_VAL_INT; |
|
case IIO_MOD_Z: |
|
ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z, |
|
&tmp); |
|
if (ret < 0) |
|
return ret; |
|
*val = BMC150_MAGN_REGVAL_TO_REPZ(tmp); |
|
return IIO_VAL_INT; |
|
default: |
|
return -EINVAL; |
|
} |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int bmc150_magn_write_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
int val, int val2, long mask) |
|
{ |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
if (val > data->max_odr) |
|
return -EINVAL; |
|
mutex_lock(&data->mutex); |
|
ret = bmc150_magn_set_odr(data, val); |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
|
switch (chan->channel2) { |
|
case IIO_MOD_X: |
|
case IIO_MOD_Y: |
|
if (val < 1 || val > 511) |
|
return -EINVAL; |
|
mutex_lock(&data->mutex); |
|
ret = bmc150_magn_set_max_odr(data, val, 0, 0); |
|
if (ret < 0) { |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
} |
|
ret = regmap_update_bits(data->regmap, |
|
BMC150_MAGN_REG_REP_XY, |
|
BMC150_MAGN_REG_REP_DATAMASK, |
|
BMC150_MAGN_REPXY_TO_REGVAL |
|
(val)); |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
case IIO_MOD_Z: |
|
if (val < 1 || val > 256) |
|
return -EINVAL; |
|
mutex_lock(&data->mutex); |
|
ret = bmc150_magn_set_max_odr(data, 0, val, 0); |
|
if (ret < 0) { |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
} |
|
ret = regmap_update_bits(data->regmap, |
|
BMC150_MAGN_REG_REP_Z, |
|
BMC150_MAGN_REG_REP_DATAMASK, |
|
BMC150_MAGN_REPZ_TO_REGVAL |
|
(val)); |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
default: |
|
return -EINVAL; |
|
} |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static ssize_t bmc150_magn_show_samp_freq_avail(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
size_t len = 0; |
|
u8 i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) { |
|
if (bmc150_magn_samp_freq_table[i].freq > data->max_odr) |
|
break; |
|
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", |
|
bmc150_magn_samp_freq_table[i].freq); |
|
} |
|
/* replace last space with a newline */ |
|
buf[len - 1] = '\n'; |
|
|
|
return len; |
|
} |
|
|
|
static const struct iio_mount_matrix * |
|
bmc150_magn_get_mount_matrix(const struct iio_dev *indio_dev, |
|
const struct iio_chan_spec *chan) |
|
{ |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
|
|
return &data->orientation; |
|
} |
|
|
|
static const struct iio_chan_spec_ext_info bmc150_magn_ext_info[] = { |
|
IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bmc150_magn_get_mount_matrix), |
|
{ } |
|
}; |
|
|
|
static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(bmc150_magn_show_samp_freq_avail); |
|
|
|
static struct attribute *bmc150_magn_attributes[] = { |
|
&iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
|
NULL, |
|
}; |
|
|
|
static const struct attribute_group bmc150_magn_attrs_group = { |
|
.attrs = bmc150_magn_attributes, |
|
}; |
|
|
|
#define BMC150_MAGN_CHANNEL(_axis) { \ |
|
.type = IIO_MAGN, \ |
|
.modified = 1, \ |
|
.channel2 = IIO_MOD_##_axis, \ |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
|
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ |
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ |
|
BIT(IIO_CHAN_INFO_SCALE), \ |
|
.scan_index = AXIS_##_axis, \ |
|
.scan_type = { \ |
|
.sign = 's', \ |
|
.realbits = 32, \ |
|
.storagebits = 32, \ |
|
.endianness = IIO_LE \ |
|
}, \ |
|
.ext_info = bmc150_magn_ext_info, \ |
|
} |
|
|
|
static const struct iio_chan_spec bmc150_magn_channels[] = { |
|
BMC150_MAGN_CHANNEL(X), |
|
BMC150_MAGN_CHANNEL(Y), |
|
BMC150_MAGN_CHANNEL(Z), |
|
IIO_CHAN_SOFT_TIMESTAMP(3), |
|
}; |
|
|
|
static const struct iio_info bmc150_magn_info = { |
|
.attrs = &bmc150_magn_attrs_group, |
|
.read_raw = bmc150_magn_read_raw, |
|
.write_raw = bmc150_magn_write_raw, |
|
}; |
|
|
|
static const unsigned long bmc150_magn_scan_masks[] = { |
|
BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z), |
|
0}; |
|
|
|
static irqreturn_t bmc150_magn_trigger_handler(int irq, void *p) |
|
{ |
|
struct iio_poll_func *pf = p; |
|
struct iio_dev *indio_dev = pf->indio_dev; |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
mutex_lock(&data->mutex); |
|
ret = bmc150_magn_read_xyz(data, data->buffer); |
|
if (ret < 0) |
|
goto err; |
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, |
|
pf->timestamp); |
|
|
|
err: |
|
mutex_unlock(&data->mutex); |
|
iio_trigger_notify_done(indio_dev->trig); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int bmc150_magn_init(struct bmc150_magn_data *data) |
|
{ |
|
int ret, chip_id; |
|
struct bmc150_magn_preset preset; |
|
|
|
ret = regulator_bulk_enable(ARRAY_SIZE(data->regulators), |
|
data->regulators); |
|
if (ret < 0) { |
|
dev_err(data->dev, "Failed to enable regulators: %d\n", ret); |
|
return ret; |
|
} |
|
/* |
|
* 3ms power-on time according to datasheet, let's better |
|
* be safe than sorry and set this delay to 5ms. |
|
*/ |
|
msleep(5); |
|
|
|
ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, |
|
false); |
|
if (ret < 0) { |
|
dev_err(data->dev, |
|
"Failed to bring up device from suspend mode\n"); |
|
goto err_regulator_disable; |
|
} |
|
|
|
ret = regmap_read(data->regmap, BMC150_MAGN_REG_CHIP_ID, &chip_id); |
|
if (ret < 0) { |
|
dev_err(data->dev, "Failed reading chip id\n"); |
|
goto err_poweroff; |
|
} |
|
if (chip_id != BMC150_MAGN_CHIP_ID_VAL) { |
|
dev_err(data->dev, "Invalid chip id 0x%x\n", chip_id); |
|
ret = -ENODEV; |
|
goto err_poweroff; |
|
} |
|
dev_dbg(data->dev, "Chip id %x\n", chip_id); |
|
|
|
preset = bmc150_magn_presets_table[BMC150_MAGN_DEFAULT_PRESET]; |
|
ret = bmc150_magn_set_odr(data, preset.odr); |
|
if (ret < 0) { |
|
dev_err(data->dev, "Failed to set ODR to %d\n", |
|
preset.odr); |
|
goto err_poweroff; |
|
} |
|
|
|
ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_XY, |
|
BMC150_MAGN_REPXY_TO_REGVAL(preset.rep_xy)); |
|
if (ret < 0) { |
|
dev_err(data->dev, "Failed to set REP XY to %d\n", |
|
preset.rep_xy); |
|
goto err_poweroff; |
|
} |
|
|
|
ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_Z, |
|
BMC150_MAGN_REPZ_TO_REGVAL(preset.rep_z)); |
|
if (ret < 0) { |
|
dev_err(data->dev, "Failed to set REP Z to %d\n", |
|
preset.rep_z); |
|
goto err_poweroff; |
|
} |
|
|
|
ret = bmc150_magn_set_max_odr(data, preset.rep_xy, preset.rep_z, |
|
preset.odr); |
|
if (ret < 0) |
|
goto err_poweroff; |
|
|
|
ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL, |
|
true); |
|
if (ret < 0) { |
|
dev_err(data->dev, "Failed to power on device\n"); |
|
goto err_poweroff; |
|
} |
|
|
|
return 0; |
|
|
|
err_poweroff: |
|
bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true); |
|
err_regulator_disable: |
|
regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators); |
|
return ret; |
|
} |
|
|
|
static int bmc150_magn_reset_intr(struct bmc150_magn_data *data) |
|
{ |
|
int tmp; |
|
|
|
/* |
|
* Data Ready (DRDY) is always cleared after |
|
* readout of data registers ends. |
|
*/ |
|
return regmap_read(data->regmap, BMC150_MAGN_REG_X_L, &tmp); |
|
} |
|
|
|
static void bmc150_magn_trig_reen(struct iio_trigger *trig) |
|
{ |
|
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
if (!data->dready_trigger_on) |
|
return; |
|
|
|
mutex_lock(&data->mutex); |
|
ret = bmc150_magn_reset_intr(data); |
|
mutex_unlock(&data->mutex); |
|
if (ret) |
|
dev_err(data->dev, "Failed to reset interrupt\n"); |
|
} |
|
|
|
static int bmc150_magn_data_rdy_trigger_set_state(struct iio_trigger *trig, |
|
bool state) |
|
{ |
|
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
int ret = 0; |
|
|
|
mutex_lock(&data->mutex); |
|
if (state == data->dready_trigger_on) |
|
goto err_unlock; |
|
|
|
ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_INT_DRDY, |
|
BMC150_MAGN_MASK_DRDY_EN, |
|
state << BMC150_MAGN_SHIFT_DRDY_EN); |
|
if (ret < 0) |
|
goto err_unlock; |
|
|
|
data->dready_trigger_on = state; |
|
|
|
if (state) { |
|
ret = bmc150_magn_reset_intr(data); |
|
if (ret < 0) |
|
goto err_unlock; |
|
} |
|
mutex_unlock(&data->mutex); |
|
|
|
return 0; |
|
|
|
err_unlock: |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
} |
|
|
|
static const struct iio_trigger_ops bmc150_magn_trigger_ops = { |
|
.set_trigger_state = bmc150_magn_data_rdy_trigger_set_state, |
|
.reenable = bmc150_magn_trig_reen, |
|
}; |
|
|
|
static int bmc150_magn_buffer_preenable(struct iio_dev *indio_dev) |
|
{ |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
|
|
return bmc150_magn_set_power_state(data, true); |
|
} |
|
|
|
static int bmc150_magn_buffer_postdisable(struct iio_dev *indio_dev) |
|
{ |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
|
|
return bmc150_magn_set_power_state(data, false); |
|
} |
|
|
|
static const struct iio_buffer_setup_ops bmc150_magn_buffer_setup_ops = { |
|
.preenable = bmc150_magn_buffer_preenable, |
|
.postdisable = bmc150_magn_buffer_postdisable, |
|
}; |
|
|
|
static const char *bmc150_magn_match_acpi_device(struct device *dev) |
|
{ |
|
const struct acpi_device_id *id; |
|
|
|
id = acpi_match_device(dev->driver->acpi_match_table, dev); |
|
if (!id) |
|
return NULL; |
|
|
|
return dev_name(dev); |
|
} |
|
|
|
int bmc150_magn_probe(struct device *dev, struct regmap *regmap, |
|
int irq, const char *name) |
|
{ |
|
struct bmc150_magn_data *data; |
|
struct iio_dev *indio_dev; |
|
int ret; |
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); |
|
if (!indio_dev) |
|
return -ENOMEM; |
|
|
|
data = iio_priv(indio_dev); |
|
dev_set_drvdata(dev, indio_dev); |
|
data->regmap = regmap; |
|
data->irq = irq; |
|
data->dev = dev; |
|
|
|
data->regulators[0].supply = "vdd"; |
|
data->regulators[1].supply = "vddio"; |
|
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators), |
|
data->regulators); |
|
if (ret) |
|
return dev_err_probe(dev, ret, "failed to get regulators\n"); |
|
|
|
ret = iio_read_mount_matrix(dev, "mount-matrix", |
|
&data->orientation); |
|
if (ret) |
|
return ret; |
|
|
|
if (!name && ACPI_HANDLE(dev)) |
|
name = bmc150_magn_match_acpi_device(dev); |
|
|
|
mutex_init(&data->mutex); |
|
|
|
ret = bmc150_magn_init(data); |
|
if (ret < 0) |
|
return ret; |
|
|
|
indio_dev->channels = bmc150_magn_channels; |
|
indio_dev->num_channels = ARRAY_SIZE(bmc150_magn_channels); |
|
indio_dev->available_scan_masks = bmc150_magn_scan_masks; |
|
indio_dev->name = name; |
|
indio_dev->modes = INDIO_DIRECT_MODE; |
|
indio_dev->info = &bmc150_magn_info; |
|
|
|
if (irq > 0) { |
|
data->dready_trig = devm_iio_trigger_alloc(dev, |
|
"%s-dev%d", |
|
indio_dev->name, |
|
indio_dev->id); |
|
if (!data->dready_trig) { |
|
ret = -ENOMEM; |
|
dev_err(dev, "iio trigger alloc failed\n"); |
|
goto err_poweroff; |
|
} |
|
|
|
data->dready_trig->dev.parent = dev; |
|
data->dready_trig->ops = &bmc150_magn_trigger_ops; |
|
iio_trigger_set_drvdata(data->dready_trig, indio_dev); |
|
ret = iio_trigger_register(data->dready_trig); |
|
if (ret) { |
|
dev_err(dev, "iio trigger register failed\n"); |
|
goto err_poweroff; |
|
} |
|
|
|
ret = request_threaded_irq(irq, |
|
iio_trigger_generic_data_rdy_poll, |
|
NULL, |
|
IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
|
BMC150_MAGN_IRQ_NAME, |
|
data->dready_trig); |
|
if (ret < 0) { |
|
dev_err(dev, "request irq %d failed\n", irq); |
|
goto err_trigger_unregister; |
|
} |
|
} |
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, |
|
iio_pollfunc_store_time, |
|
bmc150_magn_trigger_handler, |
|
&bmc150_magn_buffer_setup_ops); |
|
if (ret < 0) { |
|
dev_err(dev, "iio triggered buffer setup failed\n"); |
|
goto err_free_irq; |
|
} |
|
|
|
ret = pm_runtime_set_active(dev); |
|
if (ret) |
|
goto err_buffer_cleanup; |
|
|
|
pm_runtime_enable(dev); |
|
pm_runtime_set_autosuspend_delay(dev, |
|
BMC150_MAGN_AUTO_SUSPEND_DELAY_MS); |
|
pm_runtime_use_autosuspend(dev); |
|
|
|
ret = iio_device_register(indio_dev); |
|
if (ret < 0) { |
|
dev_err(dev, "unable to register iio device\n"); |
|
goto err_buffer_cleanup; |
|
} |
|
|
|
dev_dbg(dev, "Registered device %s\n", name); |
|
return 0; |
|
|
|
err_buffer_cleanup: |
|
iio_triggered_buffer_cleanup(indio_dev); |
|
err_free_irq: |
|
if (irq > 0) |
|
free_irq(irq, data->dready_trig); |
|
err_trigger_unregister: |
|
if (data->dready_trig) |
|
iio_trigger_unregister(data->dready_trig); |
|
err_poweroff: |
|
bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(bmc150_magn_probe); |
|
|
|
int bmc150_magn_remove(struct device *dev) |
|
{ |
|
struct iio_dev *indio_dev = dev_get_drvdata(dev); |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
|
|
iio_device_unregister(indio_dev); |
|
|
|
pm_runtime_disable(dev); |
|
pm_runtime_set_suspended(dev); |
|
pm_runtime_put_noidle(dev); |
|
|
|
iio_triggered_buffer_cleanup(indio_dev); |
|
|
|
if (data->irq > 0) |
|
free_irq(data->irq, data->dready_trig); |
|
|
|
if (data->dready_trig) |
|
iio_trigger_unregister(data->dready_trig); |
|
|
|
mutex_lock(&data->mutex); |
|
bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true); |
|
mutex_unlock(&data->mutex); |
|
|
|
regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(bmc150_magn_remove); |
|
|
|
#ifdef CONFIG_PM |
|
static int bmc150_magn_runtime_suspend(struct device *dev) |
|
{ |
|
struct iio_dev *indio_dev = dev_get_drvdata(dev); |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
mutex_lock(&data->mutex); |
|
ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP, |
|
true); |
|
mutex_unlock(&data->mutex); |
|
if (ret < 0) { |
|
dev_err(dev, "powering off device failed\n"); |
|
return ret; |
|
} |
|
return 0; |
|
} |
|
|
|
/* |
|
* Should be called with data->mutex held. |
|
*/ |
|
static int bmc150_magn_runtime_resume(struct device *dev) |
|
{ |
|
struct iio_dev *indio_dev = dev_get_drvdata(dev); |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
|
|
return bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL, |
|
true); |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int bmc150_magn_suspend(struct device *dev) |
|
{ |
|
struct iio_dev *indio_dev = dev_get_drvdata(dev); |
|
struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
mutex_lock(&data->mutex); |
|
ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP, |
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true); |
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mutex_unlock(&data->mutex); |
|
|
|
return ret; |
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} |
|
|
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static int bmc150_magn_resume(struct device *dev) |
|
{ |
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struct iio_dev *indio_dev = dev_get_drvdata(dev); |
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struct bmc150_magn_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
mutex_lock(&data->mutex); |
|
ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL, |
|
true); |
|
mutex_unlock(&data->mutex); |
|
|
|
return ret; |
|
} |
|
#endif |
|
|
|
const struct dev_pm_ops bmc150_magn_pm_ops = { |
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SET_SYSTEM_SLEEP_PM_OPS(bmc150_magn_suspend, bmc150_magn_resume) |
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SET_RUNTIME_PM_OPS(bmc150_magn_runtime_suspend, |
|
bmc150_magn_runtime_resume, NULL) |
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}; |
|
EXPORT_SYMBOL(bmc150_magn_pm_ops); |
|
|
|
MODULE_AUTHOR("Irina Tirdea <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("BMC150 magnetometer core driver");
|
|
|