2019-05-29 16:57:47 -07:00
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// SPDX-License-Identifier: GPL-2.0-only
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2011-07-06 18:36:51 -07:00
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/*
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* Copyright (C) 2011 Kionix, Inc.
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* Written by Chris Hudson <chudson@kionix.com>
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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2011-07-30 11:55:38 -07:00
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#include <linux/module.h>
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2011-07-06 18:36:51 -07:00
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#include <linux/slab.h>
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#include <linux/input/kxtj9.h>
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#define NAME "kxtj9"
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#define G_MAX 8000
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/* OUTPUT REGISTERS */
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#define XOUT_L 0x06
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#define WHO_AM_I 0x0F
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/* CONTROL REGISTERS */
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#define INT_REL 0x1A
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#define CTRL_REG1 0x1B
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#define INT_CTRL1 0x1E
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#define DATA_CTRL 0x21
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/* CONTROL REGISTER 1 BITS */
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#define PC1_OFF 0x7F
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#define PC1_ON (1 << 7)
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/* Data ready funtion enable bit: set during probe if using irq mode */
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#define DRDYE (1 << 5)
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2012-03-16 22:47:47 -07:00
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/* DATA CONTROL REGISTER BITS */
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#define ODR12_5F 0
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#define ODR25F 1
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#define ODR50F 2
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#define ODR100F 3
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#define ODR200F 4
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#define ODR400F 5
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#define ODR800F 6
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2011-07-06 18:36:51 -07:00
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/* INTERRUPT CONTROL REGISTER 1 BITS */
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/* Set these during probe if using irq mode */
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#define KXTJ9_IEL (1 << 3)
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#define KXTJ9_IEA (1 << 4)
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#define KXTJ9_IEN (1 << 5)
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/* INPUT_ABS CONSTANTS */
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#define FUZZ 3
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#define FLAT 3
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/* RESUME STATE INDICES */
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#define RES_DATA_CTRL 0
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#define RES_CTRL_REG1 1
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#define RES_INT_CTRL1 2
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#define RESUME_ENTRIES 3
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/*
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* The following table lists the maximum appropriate poll interval for each
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* available output data rate.
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*/
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static const struct {
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unsigned int cutoff;
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u8 mask;
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} kxtj9_odr_table[] = {
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{ 3, ODR800F },
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{ 5, ODR400F },
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{ 10, ODR200F },
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{ 20, ODR100F },
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{ 40, ODR50F },
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{ 80, ODR25F },
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{ 0, ODR12_5F},
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};
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struct kxtj9_data {
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struct i2c_client *client;
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struct kxtj9_platform_data pdata;
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struct input_dev *input_dev;
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unsigned int last_poll_interval;
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u8 shift;
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u8 ctrl_reg1;
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u8 data_ctrl;
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u8 int_ctrl;
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};
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static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len)
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{
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struct i2c_msg msgs[] = {
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{
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.addr = tj9->client->addr,
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.flags = tj9->client->flags,
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.len = 1,
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.buf = &addr,
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},
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{
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.addr = tj9->client->addr,
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.flags = tj9->client->flags | I2C_M_RD,
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.len = len,
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.buf = data,
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},
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};
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return i2c_transfer(tj9->client->adapter, msgs, 2);
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}
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static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
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{
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s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
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s16 x, y, z;
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int err;
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err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
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if (err < 0)
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dev_err(&tj9->client->dev, "accelerometer data read failed\n");
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2012-03-16 22:47:47 -07:00
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x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]);
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y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]);
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z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]);
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x >>= tj9->shift;
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y >>= tj9->shift;
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z >>= tj9->shift;
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2011-07-06 18:36:51 -07:00
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input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
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input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
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input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
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input_sync(tj9->input_dev);
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}
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static irqreturn_t kxtj9_isr(int irq, void *dev)
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{
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struct kxtj9_data *tj9 = dev;
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int err;
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/* data ready is the only possible interrupt type */
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kxtj9_report_acceleration_data(tj9);
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err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
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if (err < 0)
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dev_err(&tj9->client->dev,
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"error clearing interrupt status: %d\n", err);
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return IRQ_HANDLED;
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}
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static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
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{
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switch (new_g_range) {
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case KXTJ9_G_2G:
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tj9->shift = 4;
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break;
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case KXTJ9_G_4G:
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tj9->shift = 3;
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break;
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case KXTJ9_G_8G:
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tj9->shift = 2;
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break;
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default:
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return -EINVAL;
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}
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tj9->ctrl_reg1 &= 0xe7;
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tj9->ctrl_reg1 |= new_g_range;
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return 0;
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}
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static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
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{
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int err;
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int i;
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/* Use the lowest ODR that can support the requested poll interval */
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for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
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tj9->data_ctrl = kxtj9_odr_table[i].mask;
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if (poll_interval < kxtj9_odr_table[i].cutoff)
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break;
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}
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err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
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if (err < 0)
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return err;
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err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
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if (err < 0)
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return err;
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err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
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if (err < 0)
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return err;
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return 0;
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}
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static int kxtj9_device_power_on(struct kxtj9_data *tj9)
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{
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if (tj9->pdata.power_on)
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return tj9->pdata.power_on();
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return 0;
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}
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static void kxtj9_device_power_off(struct kxtj9_data *tj9)
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{
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int err;
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tj9->ctrl_reg1 &= PC1_OFF;
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err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
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if (err < 0)
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dev_err(&tj9->client->dev, "soft power off failed\n");
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if (tj9->pdata.power_off)
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tj9->pdata.power_off();
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}
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static int kxtj9_enable(struct kxtj9_data *tj9)
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{
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int err;
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err = kxtj9_device_power_on(tj9);
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if (err < 0)
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return err;
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/* ensure that PC1 is cleared before updating control registers */
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err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
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if (err < 0)
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return err;
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/* only write INT_CTRL_REG1 if in irq mode */
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if (tj9->client->irq) {
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err = i2c_smbus_write_byte_data(tj9->client,
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INT_CTRL1, tj9->int_ctrl);
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if (err < 0)
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return err;
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}
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err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
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if (err < 0)
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return err;
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/* turn on outputs */
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tj9->ctrl_reg1 |= PC1_ON;
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err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
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if (err < 0)
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return err;
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err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
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if (err < 0)
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return err;
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/* clear initial interrupt if in irq mode */
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if (tj9->client->irq) {
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err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
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if (err < 0) {
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dev_err(&tj9->client->dev,
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"error clearing interrupt: %d\n", err);
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goto fail;
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}
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}
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return 0;
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fail:
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kxtj9_device_power_off(tj9);
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return err;
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}
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static void kxtj9_disable(struct kxtj9_data *tj9)
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{
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kxtj9_device_power_off(tj9);
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}
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static int kxtj9_input_open(struct input_dev *input)
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{
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struct kxtj9_data *tj9 = input_get_drvdata(input);
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return kxtj9_enable(tj9);
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}
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static void kxtj9_input_close(struct input_dev *dev)
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{
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struct kxtj9_data *tj9 = input_get_drvdata(dev);
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kxtj9_disable(tj9);
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}
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/*
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* When IRQ mode is selected, we need to provide an interface to allow the user
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* to change the output data rate of the part. For consistency, we are using
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* the set_poll method, which accepts a poll interval in milliseconds, and then
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* calls update_odr() while passing this value as an argument. In IRQ mode, the
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* data outputs will not be read AT the requested poll interval, rather, the
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* lowest ODR that can support the requested interval. The client application
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* will be responsible for retrieving data from the input node at the desired
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* interval.
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*/
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/* Returns currently selected poll interval (in ms) */
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static ssize_t kxtj9_get_poll(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct kxtj9_data *tj9 = i2c_get_clientdata(client);
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return sprintf(buf, "%d\n", tj9->last_poll_interval);
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}
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/* Allow users to select a new poll interval (in ms) */
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static ssize_t kxtj9_set_poll(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct kxtj9_data *tj9 = i2c_get_clientdata(client);
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struct input_dev *input_dev = tj9->input_dev;
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unsigned int interval;
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int error;
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error = kstrtouint(buf, 10, &interval);
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if (error < 0)
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return error;
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/* Lock the device to prevent races with open/close (and itself) */
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2011-07-19 23:16:29 -07:00
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mutex_lock(&input_dev->mutex);
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2011-07-06 18:36:51 -07:00
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disable_irq(client->irq);
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/*
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* Set current interval to the greater of the minimum interval or
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* the requested interval
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*/
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tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);
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kxtj9_update_odr(tj9, tj9->last_poll_interval);
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enable_irq(client->irq);
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mutex_unlock(&input_dev->mutex);
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return count;
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}
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static DEVICE_ATTR(poll, S_IRUGO|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);
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2023-07-28 17:51:13 -07:00
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static struct attribute *kxtj9_attrs[] = {
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2011-07-06 18:36:51 -07:00
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&dev_attr_poll.attr,
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NULL
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};
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2023-07-28 17:51:13 -07:00
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static umode_t kxtj9_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct i2c_client *client = to_i2c_client(dev);
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return client->irq ? attr->mode : 0;
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}
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static struct attribute_group kxtj9_group = {
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.attrs = kxtj9_attrs,
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.is_visible = kxtj9_attr_is_visible,
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2011-07-06 18:36:51 -07:00
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};
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2023-07-28 17:51:13 -07:00
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__ATTRIBUTE_GROUPS(kxtj9);
|
2011-07-06 18:36:51 -07:00
|
|
|
|
2019-10-29 17:05:34 -07:00
|
|
|
static void kxtj9_poll(struct input_dev *input)
|
2011-07-06 18:36:51 -07:00
|
|
|
{
|
2019-10-29 17:05:34 -07:00
|
|
|
struct kxtj9_data *tj9 = input_get_drvdata(input);
|
|
|
|
unsigned int poll_interval = input_get_poll_interval(input);
|
2011-07-06 18:36:51 -07:00
|
|
|
|
|
|
|
kxtj9_report_acceleration_data(tj9);
|
|
|
|
|
|
|
|
if (poll_interval != tj9->last_poll_interval) {
|
|
|
|
kxtj9_update_odr(tj9, poll_interval);
|
|
|
|
tj9->last_poll_interval = poll_interval;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-10-29 17:05:27 -07:00
|
|
|
static void kxtj9_platform_exit(void *data)
|
2011-07-06 18:36:51 -07:00
|
|
|
{
|
2019-10-29 17:05:27 -07:00
|
|
|
struct kxtj9_data *tj9 = data;
|
2011-07-06 18:36:51 -07:00
|
|
|
|
2019-10-29 17:05:27 -07:00
|
|
|
if (tj9->pdata.exit)
|
|
|
|
tj9->pdata.exit();
|
|
|
|
}
|
2011-07-06 18:36:51 -07:00
|
|
|
|
2012-11-23 22:38:25 -07:00
|
|
|
static int kxtj9_verify(struct kxtj9_data *tj9)
|
2011-07-06 18:36:51 -07:00
|
|
|
{
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
retval = kxtj9_device_power_on(tj9);
|
|
|
|
if (retval < 0)
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
|
|
|
|
if (retval < 0) {
|
|
|
|
dev_err(&tj9->client->dev, "read err int source\n");
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2012-03-16 22:47:47 -07:00
|
|
|
retval = (retval != 0x07 && retval != 0x08) ? -EIO : 0;
|
2011-07-06 18:36:51 -07:00
|
|
|
|
|
|
|
out:
|
|
|
|
kxtj9_device_power_off(tj9);
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2022-11-18 15:39:11 -07:00
|
|
|
static int kxtj9_probe(struct i2c_client *client)
|
2011-07-06 18:36:51 -07:00
|
|
|
{
|
2013-12-05 20:21:10 -07:00
|
|
|
const struct kxtj9_platform_data *pdata =
|
|
|
|
dev_get_platdata(&client->dev);
|
2011-07-06 18:36:51 -07:00
|
|
|
struct kxtj9_data *tj9;
|
2019-10-29 17:05:34 -07:00
|
|
|
struct input_dev *input_dev;
|
2011-07-06 18:36:51 -07:00
|
|
|
int err;
|
|
|
|
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
|
|
I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE_DATA)) {
|
|
|
|
dev_err(&client->dev, "client is not i2c capable\n");
|
|
|
|
return -ENXIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!pdata) {
|
|
|
|
dev_err(&client->dev, "platform data is NULL; exiting\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2019-10-29 17:05:27 -07:00
|
|
|
tj9 = devm_kzalloc(&client->dev, sizeof(*tj9), GFP_KERNEL);
|
2011-07-06 18:36:51 -07:00
|
|
|
if (!tj9) {
|
|
|
|
dev_err(&client->dev,
|
|
|
|
"failed to allocate memory for module data\n");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
tj9->client = client;
|
|
|
|
tj9->pdata = *pdata;
|
|
|
|
|
|
|
|
if (pdata->init) {
|
|
|
|
err = pdata->init();
|
|
|
|
if (err < 0)
|
2019-10-29 17:05:27 -07:00
|
|
|
return err;
|
2011-07-06 18:36:51 -07:00
|
|
|
}
|
|
|
|
|
2019-10-29 17:05:27 -07:00
|
|
|
err = devm_add_action_or_reset(&client->dev, kxtj9_platform_exit, tj9);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
2011-07-06 18:36:51 -07:00
|
|
|
err = kxtj9_verify(tj9);
|
|
|
|
if (err < 0) {
|
|
|
|
dev_err(&client->dev, "device not recognized\n");
|
2019-10-29 17:05:27 -07:00
|
|
|
return err;
|
2011-07-06 18:36:51 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
i2c_set_clientdata(client, tj9);
|
|
|
|
|
|
|
|
tj9->ctrl_reg1 = tj9->pdata.res_12bit | tj9->pdata.g_range;
|
2012-03-16 22:47:47 -07:00
|
|
|
tj9->last_poll_interval = tj9->pdata.init_interval;
|
2011-07-06 18:36:51 -07:00
|
|
|
|
2019-10-29 17:05:34 -07:00
|
|
|
input_dev = devm_input_allocate_device(&client->dev);
|
|
|
|
if (!input_dev) {
|
|
|
|
dev_err(&client->dev, "input device allocate failed\n");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
input_set_drvdata(input_dev, tj9);
|
|
|
|
tj9->input_dev = input_dev;
|
|
|
|
|
|
|
|
input_dev->name = "kxtj9_accel";
|
|
|
|
input_dev->id.bustype = BUS_I2C;
|
|
|
|
|
|
|
|
input_dev->open = kxtj9_input_open;
|
|
|
|
input_dev->close = kxtj9_input_close;
|
|
|
|
|
|
|
|
input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
|
|
|
|
input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
|
|
|
|
input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
|
|
|
|
|
|
|
|
if (client->irq <= 0) {
|
|
|
|
err = input_setup_polling(input_dev, kxtj9_poll);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
err = input_register_device(input_dev);
|
|
|
|
if (err) {
|
|
|
|
dev_err(&client->dev,
|
|
|
|
"unable to register input polled device %s: %d\n",
|
|
|
|
input_dev->name, err);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2011-07-06 18:36:51 -07:00
|
|
|
if (client->irq) {
|
|
|
|
/* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
|
|
|
|
tj9->int_ctrl |= KXTJ9_IEN | KXTJ9_IEA | KXTJ9_IEL;
|
|
|
|
tj9->ctrl_reg1 |= DRDYE;
|
|
|
|
|
2019-10-29 17:05:27 -07:00
|
|
|
err = devm_request_threaded_irq(&client->dev, client->irq,
|
|
|
|
NULL, kxtj9_isr,
|
|
|
|
IRQF_TRIGGER_RISING |
|
|
|
|
IRQF_ONESHOT,
|
|
|
|
"kxtj9-irq", tj9);
|
2011-07-06 18:36:51 -07:00
|
|
|
if (err) {
|
|
|
|
dev_err(&client->dev, "request irq failed: %d\n", err);
|
2019-10-29 17:05:27 -07:00
|
|
|
return err;
|
2011-07-06 18:36:51 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2023-01-02 11:17:43 -07:00
|
|
|
static int kxtj9_suspend(struct device *dev)
|
2011-07-06 18:36:51 -07:00
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
struct kxtj9_data *tj9 = i2c_get_clientdata(client);
|
|
|
|
struct input_dev *input_dev = tj9->input_dev;
|
|
|
|
|
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
|
2020-10-04 21:16:07 -07:00
|
|
|
if (input_device_enabled(input_dev))
|
2011-07-06 18:36:51 -07:00
|
|
|
kxtj9_disable(tj9);
|
|
|
|
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2023-01-02 11:17:43 -07:00
|
|
|
static int kxtj9_resume(struct device *dev)
|
2011-07-06 18:36:51 -07:00
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
struct kxtj9_data *tj9 = i2c_get_clientdata(client);
|
|
|
|
struct input_dev *input_dev = tj9->input_dev;
|
|
|
|
|
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
|
2020-10-04 21:16:07 -07:00
|
|
|
if (input_device_enabled(input_dev))
|
2011-07-06 18:36:51 -07:00
|
|
|
kxtj9_enable(tj9);
|
|
|
|
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
2015-10-02 11:14:26 -07:00
|
|
|
return 0;
|
2011-07-06 18:36:51 -07:00
|
|
|
}
|
|
|
|
|
2023-01-02 11:17:43 -07:00
|
|
|
static DEFINE_SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
|
2011-07-06 18:36:51 -07:00
|
|
|
|
|
|
|
static const struct i2c_device_id kxtj9_id[] = {
|
2024-05-09 10:41:59 -07:00
|
|
|
{ NAME },
|
|
|
|
{ }
|
2011-07-06 18:36:51 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
MODULE_DEVICE_TABLE(i2c, kxtj9_id);
|
|
|
|
|
|
|
|
static struct i2c_driver kxtj9_driver = {
|
|
|
|
.driver = {
|
2023-07-28 17:51:13 -07:00
|
|
|
.name = NAME,
|
|
|
|
.dev_groups = kxtj9_groups,
|
|
|
|
.pm = pm_sleep_ptr(&kxtj9_pm_ops),
|
2011-07-06 18:36:51 -07:00
|
|
|
},
|
2023-05-17 09:55:42 -07:00
|
|
|
.probe = kxtj9_probe,
|
2011-07-06 18:36:51 -07:00
|
|
|
.id_table = kxtj9_id,
|
|
|
|
};
|
|
|
|
|
2012-03-16 23:05:41 -07:00
|
|
|
module_i2c_driver(kxtj9_driver);
|
2011-07-06 18:36:51 -07:00
|
|
|
|
|
|
|
MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
|
|
|
|
MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
|
|
|
|
MODULE_LICENSE("GPL");
|