// SPDX-License-Identifier: GPL-2.0-only
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/*
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* VTI CMA3000_D0x Accelerometer driver
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*
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* Copyright (C) 2010 Texas Instruments
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* Author: Hemanth V <hemanthv@ti.com>
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*/
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#include <linux/types.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/input.h>
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#include <linux/input/cma3000.h>
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#include <linux/module.h>
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#include "cma3000_d0x.h"
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#define CMA3000_WHOAMI 0x00
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#define CMA3000_REVID 0x01
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#define CMA3000_CTRL 0x02
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#define CMA3000_STATUS 0x03
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#define CMA3000_RSTR 0x04
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#define CMA3000_INTSTATUS 0x05
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#define CMA3000_DOUTX 0x06
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#define CMA3000_DOUTY 0x07
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#define CMA3000_DOUTZ 0x08
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#define CMA3000_MDTHR 0x09
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#define CMA3000_MDFFTMR 0x0A
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#define CMA3000_FFTHR 0x0B
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#define CMA3000_RANGE2G (1 << 7)
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#define CMA3000_RANGE8G (0 << 7)
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#define CMA3000_BUSI2C (0 << 4)
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#define CMA3000_MODEMASK (7 << 1)
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#define CMA3000_GRANGEMASK (1 << 7)
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#define CMA3000_STATUS_PERR 1
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#define CMA3000_INTSTATUS_FFDET (1 << 2)
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/* Settling time delay in ms */
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#define CMA3000_SETDELAY 30
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/* Delay for clearing interrupt in us */
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#define CMA3000_INTDELAY 44
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/*
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* Bit weights in mg for bit 0, other bits need
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* multiply factor 2^n. Eight bit is the sign bit.
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*/
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#define BIT_TO_2G 18
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#define BIT_TO_8G 71
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struct cma3000_accl_data {
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const struct cma3000_bus_ops *bus_ops;
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const struct cma3000_platform_data *pdata;
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struct device *dev;
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struct input_dev *input_dev;
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int bit_to_mg;
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int irq;
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int g_range;
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u8 mode;
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struct mutex mutex;
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bool opened;
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bool suspended;
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};
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#define CMA3000_READ(data, reg, msg) \
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(data->bus_ops->read(data->dev, reg, msg))
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#define CMA3000_SET(data, reg, val, msg) \
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((data)->bus_ops->write(data->dev, reg, val, msg))
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/*
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* Conversion for each of the eight modes to g, depending
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* on G range i.e 2G or 8G. Some modes always operate in
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* 8G.
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*/
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static int mode_to_mg[8][2] = {
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{ 0, 0 },
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{ BIT_TO_8G, BIT_TO_2G },
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{ BIT_TO_8G, BIT_TO_2G },
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{ BIT_TO_8G, BIT_TO_8G },
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{ BIT_TO_8G, BIT_TO_8G },
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{ BIT_TO_8G, BIT_TO_2G },
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{ BIT_TO_8G, BIT_TO_2G },
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{ 0, 0},
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};
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static void decode_mg(struct cma3000_accl_data *data, int *datax,
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int *datay, int *dataz)
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{
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/* Data in 2's complement, convert to mg */
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*datax = ((s8)*datax) * data->bit_to_mg;
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*datay = ((s8)*datay) * data->bit_to_mg;
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*dataz = ((s8)*dataz) * data->bit_to_mg;
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}
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static irqreturn_t cma3000_thread_irq(int irq, void *dev_id)
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{
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struct cma3000_accl_data *data = dev_id;
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int datax, datay, dataz, intr_status;
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u8 ctrl, mode, range;
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intr_status = CMA3000_READ(data, CMA3000_INTSTATUS, "interrupt status");
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if (intr_status < 0)
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return IRQ_NONE;
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/* Check if free fall is detected, report immediately */
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if (intr_status & CMA3000_INTSTATUS_FFDET) {
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input_report_abs(data->input_dev, ABS_MISC, 1);
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input_sync(data->input_dev);
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} else {
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input_report_abs(data->input_dev, ABS_MISC, 0);
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}
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datax = CMA3000_READ(data, CMA3000_DOUTX, "X");
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datay = CMA3000_READ(data, CMA3000_DOUTY, "Y");
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dataz = CMA3000_READ(data, CMA3000_DOUTZ, "Z");
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ctrl = CMA3000_READ(data, CMA3000_CTRL, "ctrl");
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mode = (ctrl & CMA3000_MODEMASK) >> 1;
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range = (ctrl & CMA3000_GRANGEMASK) >> 7;
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data->bit_to_mg = mode_to_mg[mode][range];
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/* Interrupt not for this device */
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if (data->bit_to_mg == 0)
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return IRQ_NONE;
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/* Decode register values to milli g */
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decode_mg(data, &datax, &datay, &dataz);
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input_report_abs(data->input_dev, ABS_X, datax);
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input_report_abs(data->input_dev, ABS_Y, datay);
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input_report_abs(data->input_dev, ABS_Z, dataz);
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input_sync(data->input_dev);
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return IRQ_HANDLED;
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}
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static int cma3000_reset(struct cma3000_accl_data *data)
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{
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int val;
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/* Reset sequence */
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CMA3000_SET(data, CMA3000_RSTR, 0x02, "Reset");
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CMA3000_SET(data, CMA3000_RSTR, 0x0A, "Reset");
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CMA3000_SET(data, CMA3000_RSTR, 0x04, "Reset");
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/* Settling time delay */
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mdelay(10);
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val = CMA3000_READ(data, CMA3000_STATUS, "Status");
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if (val < 0) {
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dev_err(data->dev, "Reset failed\n");
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return val;
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}
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if (val & CMA3000_STATUS_PERR) {
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dev_err(data->dev, "Parity Error\n");
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return -EIO;
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}
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return 0;
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}
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static int cma3000_poweron(struct cma3000_accl_data *data)
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{
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const struct cma3000_platform_data *pdata = data->pdata;
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u8 ctrl = 0;
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int ret;
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if (data->g_range == CMARANGE_2G) {
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ctrl = (data->mode << 1) | CMA3000_RANGE2G;
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} else if (data->g_range == CMARANGE_8G) {
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ctrl = (data->mode << 1) | CMA3000_RANGE8G;
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} else {
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dev_info(data->dev,
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"Invalid G range specified, assuming 8G\n");
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ctrl = (data->mode << 1) | CMA3000_RANGE8G;
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}
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ctrl |= data->bus_ops->ctrl_mod;
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CMA3000_SET(data, CMA3000_MDTHR, pdata->mdthr,
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"Motion Detect Threshold");
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CMA3000_SET(data, CMA3000_MDFFTMR, pdata->mdfftmr,
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"Time register");
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CMA3000_SET(data, CMA3000_FFTHR, pdata->ffthr,
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"Free fall threshold");
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ret = CMA3000_SET(data, CMA3000_CTRL, ctrl, "Mode setting");
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if (ret < 0)
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return -EIO;
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msleep(CMA3000_SETDELAY);
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return 0;
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}
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static int cma3000_poweroff(struct cma3000_accl_data *data)
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{
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int ret;
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ret = CMA3000_SET(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting");
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msleep(CMA3000_SETDELAY);
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return ret;
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}
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static int cma3000_open(struct input_dev *input_dev)
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{
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struct cma3000_accl_data *data = input_get_drvdata(input_dev);
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mutex_lock(&data->mutex);
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if (!data->suspended)
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cma3000_poweron(data);
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data->opened = true;
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mutex_unlock(&data->mutex);
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return 0;
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}
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static void cma3000_close(struct input_dev *input_dev)
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{
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struct cma3000_accl_data *data = input_get_drvdata(input_dev);
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mutex_lock(&data->mutex);
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if (!data->suspended)
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cma3000_poweroff(data);
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data->opened = false;
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mutex_unlock(&data->mutex);
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}
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void cma3000_suspend(struct cma3000_accl_data *data)
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{
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mutex_lock(&data->mutex);
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if (!data->suspended && data->opened)
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cma3000_poweroff(data);
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data->suspended = true;
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mutex_unlock(&data->mutex);
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}
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EXPORT_SYMBOL(cma3000_suspend);
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void cma3000_resume(struct cma3000_accl_data *data)
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{
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mutex_lock(&data->mutex);
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if (data->suspended && data->opened)
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cma3000_poweron(data);
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data->suspended = false;
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mutex_unlock(&data->mutex);
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}
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EXPORT_SYMBOL(cma3000_resume);
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struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
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const struct cma3000_bus_ops *bops)
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{
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const struct cma3000_platform_data *pdata = dev_get_platdata(dev);
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struct cma3000_accl_data *data;
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struct input_dev *input_dev;
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int rev;
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int error;
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if (!pdata) {
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dev_err(dev, "platform data not found\n");
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error = -EINVAL;
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goto err_out;
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}
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/* if no IRQ return error */
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if (irq == 0) {
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error = -EINVAL;
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goto err_out;
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}
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data = kzalloc(sizeof(struct cma3000_accl_data), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!data || !input_dev) {
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error = -ENOMEM;
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goto err_free_mem;
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}
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data->dev = dev;
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data->input_dev = input_dev;
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data->bus_ops = bops;
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data->pdata = pdata;
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data->irq = irq;
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mutex_init(&data->mutex);
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data->mode = pdata->mode;
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if (data->mode > CMAMODE_POFF) {
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data->mode = CMAMODE_MOTDET;
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dev_warn(dev,
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"Invalid mode specified, assuming Motion Detect\n");
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}
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data->g_range = pdata->g_range;
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if (data->g_range != CMARANGE_2G && data->g_range != CMARANGE_8G) {
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dev_info(dev,
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"Invalid G range specified, assuming 8G\n");
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data->g_range = CMARANGE_8G;
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}
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input_dev->name = "cma3000-accelerometer";
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input_dev->id.bustype = bops->bustype;
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input_dev->open = cma3000_open;
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input_dev->close = cma3000_close;
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__set_bit(EV_ABS, input_dev->evbit);
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input_set_abs_params(input_dev, ABS_X,
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-data->g_range, data->g_range, pdata->fuzz_x, 0);
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input_set_abs_params(input_dev, ABS_Y,
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-data->g_range, data->g_range, pdata->fuzz_y, 0);
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input_set_abs_params(input_dev, ABS_Z,
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-data->g_range, data->g_range, pdata->fuzz_z, 0);
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input_set_abs_params(input_dev, ABS_MISC, 0, 1, 0, 0);
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input_set_drvdata(input_dev, data);
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error = cma3000_reset(data);
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if (error)
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goto err_free_mem;
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rev = CMA3000_READ(data, CMA3000_REVID, "Revid");
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if (rev < 0) {
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error = rev;
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goto err_free_mem;
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}
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pr_info("CMA3000 Accelerometer: Revision %x\n", rev);
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error = request_threaded_irq(irq, NULL, cma3000_thread_irq,
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pdata->irqflags | IRQF_ONESHOT,
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"cma3000_d0x", data);
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if (error) {
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dev_err(dev, "request_threaded_irq failed\n");
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goto err_free_mem;
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}
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error = input_register_device(data->input_dev);
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if (error) {
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dev_err(dev, "Unable to register input device\n");
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goto err_free_irq;
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}
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return data;
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err_free_irq:
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free_irq(irq, data);
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err_free_mem:
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input_free_device(input_dev);
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kfree(data);
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err_out:
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return ERR_PTR(error);
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}
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EXPORT_SYMBOL(cma3000_init);
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void cma3000_exit(struct cma3000_accl_data *data)
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{
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free_irq(data->irq, data);
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input_unregister_device(data->input_dev);
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kfree(data);
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}
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EXPORT_SYMBOL(cma3000_exit);
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MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");
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