1085 lines
27 KiB
C
1085 lines
27 KiB
C
// 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 contact@bosch.sensortec.com:
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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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/* Ensure timestamp is naturally aligned */
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struct {
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s32 chans[3];
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s64 timestamp __aligned(8);
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} scan;
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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_NS(bmc150_magn_regmap_config, IIO_BMC150_MAGN);
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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_resume_and_get(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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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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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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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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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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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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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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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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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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bmc150_magn_read_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, tmp;
|
|
s32 values[AXIS_XYZ_MAX];
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
if (iio_buffer_enabled(indio_dev))
|
|
return -EBUSY;
|
|
mutex_lock(&data->mutex);
|
|
|
|
ret = bmc150_magn_set_power_state(data, true);
|
|
if (ret < 0) {
|
|
mutex_unlock(&data->mutex);
|
|
return ret;
|
|
}
|
|
|
|
ret = bmc150_magn_read_xyz(data, values);
|
|
if (ret < 0) {
|
|
bmc150_magn_set_power_state(data, false);
|
|
mutex_unlock(&data->mutex);
|
|
return ret;
|
|
}
|
|
*val = values[chan->scan_index];
|
|
|
|
ret = bmc150_magn_set_power_state(data, false);
|
|
if (ret < 0) {
|
|
mutex_unlock(&data->mutex);
|
|
return ret;
|
|
}
|
|
|
|
mutex_unlock(&data->mutex);
|
|
return IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
/*
|
|
* The API/driver performs an off-chip temperature
|
|
* compensation and outputs x/y/z magnetic field data in
|
|
* 16 LSB/uT to the upper application layer.
|
|
*/
|
|
*val = 0;
|
|
*val2 = 625;
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
ret = bmc150_magn_get_odr(data, val);
|
|
if (ret < 0)
|
|
return ret;
|
|
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->scan.chans);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
|
|
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, &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,
|
|
iio_device_id(indio_dev));
|
|
if (!data->dready_trig) {
|
|
ret = -ENOMEM;
|
|
dev_err(dev, "iio trigger alloc failed\n");
|
|
goto err_poweroff;
|
|
}
|
|
|
|
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_pm_cleanup;
|
|
}
|
|
|
|
dev_dbg(dev, "Registered device %s\n", name);
|
|
return 0;
|
|
|
|
err_pm_cleanup:
|
|
pm_runtime_dont_use_autosuspend(dev);
|
|
pm_runtime_disable(dev);
|
|
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_NS(bmc150_magn_probe, IIO_BMC150_MAGN);
|
|
|
|
void 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);
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL_NS(bmc150_magn_remove, IIO_BMC150_MAGN);
|
|
|
|
#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,
|
|
true);
|
|
mutex_unlock(&data->mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bmc150_magn_resume(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_NORMAL,
|
|
true);
|
|
mutex_unlock(&data->mutex);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
const struct dev_pm_ops bmc150_magn_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(bmc150_magn_suspend, bmc150_magn_resume)
|
|
SET_RUNTIME_PM_OPS(bmc150_magn_runtime_suspend,
|
|
bmc150_magn_runtime_resume, NULL)
|
|
};
|
|
EXPORT_SYMBOL_NS(bmc150_magn_pm_ops, IIO_BMC150_MAGN);
|
|
|
|
MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("BMC150 magnetometer core driver");
|