// SPDX-License-Identifier: GPL-2.0-only
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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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#include <linux/module.h>
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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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/* 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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/* 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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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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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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mutex_lock(&input_dev->mutex);
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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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static struct attribute *kxtj9_attributes[] = {
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&dev_attr_poll.attr,
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NULL
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};
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static struct attribute_group kxtj9_attribute_group = {
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.attrs = kxtj9_attributes
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};
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static void kxtj9_poll(struct input_dev *input)
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{
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struct kxtj9_data *tj9 = input_get_drvdata(input);
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unsigned int poll_interval = input_get_poll_interval(input);
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kxtj9_report_acceleration_data(tj9);
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if (poll_interval != tj9->last_poll_interval) {
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kxtj9_update_odr(tj9, poll_interval);
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tj9->last_poll_interval = poll_interval;
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}
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}
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static void kxtj9_platform_exit(void *data)
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{
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struct kxtj9_data *tj9 = data;
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if (tj9->pdata.exit)
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tj9->pdata.exit();
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}
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static int kxtj9_verify(struct kxtj9_data *tj9)
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{
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int retval;
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retval = kxtj9_device_power_on(tj9);
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if (retval < 0)
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return retval;
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retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
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if (retval < 0) {
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dev_err(&tj9->client->dev, "read err int source\n");
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goto out;
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}
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retval = (retval != 0x07 && retval != 0x08) ? -EIO : 0;
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out:
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kxtj9_device_power_off(tj9);
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return retval;
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}
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static int kxtj9_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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const struct kxtj9_platform_data *pdata =
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dev_get_platdata(&client->dev);
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struct kxtj9_data *tj9;
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struct input_dev *input_dev;
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int err;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_err(&client->dev, "client is not i2c capable\n");
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return -ENXIO;
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}
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if (!pdata) {
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dev_err(&client->dev, "platform data is NULL; exiting\n");
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return -EINVAL;
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}
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tj9 = devm_kzalloc(&client->dev, sizeof(*tj9), GFP_KERNEL);
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if (!tj9) {
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dev_err(&client->dev,
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"failed to allocate memory for module data\n");
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return -ENOMEM;
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}
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tj9->client = client;
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tj9->pdata = *pdata;
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if (pdata->init) {
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err = pdata->init();
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if (err < 0)
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return err;
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}
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err = devm_add_action_or_reset(&client->dev, kxtj9_platform_exit, tj9);
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if (err)
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return err;
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err = kxtj9_verify(tj9);
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if (err < 0) {
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dev_err(&client->dev, "device not recognized\n");
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return err;
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}
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i2c_set_clientdata(client, tj9);
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tj9->ctrl_reg1 = tj9->pdata.res_12bit | tj9->pdata.g_range;
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tj9->last_poll_interval = tj9->pdata.init_interval;
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input_dev = devm_input_allocate_device(&client->dev);
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if (!input_dev) {
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dev_err(&client->dev, "input device allocate failed\n");
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return -ENOMEM;
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}
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input_set_drvdata(input_dev, tj9);
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tj9->input_dev = input_dev;
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input_dev->name = "kxtj9_accel";
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input_dev->id.bustype = BUS_I2C;
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input_dev->open = kxtj9_input_open;
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input_dev->close = kxtj9_input_close;
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input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
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input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
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input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
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if (client->irq <= 0) {
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err = input_setup_polling(input_dev, kxtj9_poll);
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if (err)
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return err;
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}
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err = input_register_device(input_dev);
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if (err) {
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dev_err(&client->dev,
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"unable to register input polled device %s: %d\n",
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input_dev->name, err);
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return err;
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}
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if (client->irq) {
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/* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
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tj9->int_ctrl |= KXTJ9_IEN | KXTJ9_IEA | KXTJ9_IEL;
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tj9->ctrl_reg1 |= DRDYE;
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err = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, kxtj9_isr,
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IRQF_TRIGGER_RISING |
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IRQF_ONESHOT,
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"kxtj9-irq", tj9);
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if (err) {
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dev_err(&client->dev, "request irq failed: %d\n", err);
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return err;
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}
|
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err = devm_device_add_group(&client->dev,
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&kxtj9_attribute_group);
|
if (err) {
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dev_err(&client->dev, "sysfs create failed: %d\n", err);
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return err;
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}
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}
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return 0;
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}
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static int __maybe_unused kxtj9_suspend(struct device *dev)
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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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mutex_lock(&input_dev->mutex);
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if (input_dev->users)
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kxtj9_disable(tj9);
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mutex_unlock(&input_dev->mutex);
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return 0;
|
}
|
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static int __maybe_unused kxtj9_resume(struct device *dev)
|
{
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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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mutex_lock(&input_dev->mutex);
|
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if (input_dev->users)
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kxtj9_enable(tj9);
|
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mutex_unlock(&input_dev->mutex);
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return 0;
|
}
|
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static SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
|
|
static const struct i2c_device_id kxtj9_id[] = {
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{ NAME, 0 },
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{ },
|
};
|
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MODULE_DEVICE_TABLE(i2c, kxtj9_id);
|
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static struct i2c_driver kxtj9_driver = {
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.driver = {
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.name = NAME,
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.pm = &kxtj9_pm_ops,
|
},
|
.probe = kxtj9_probe,
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.id_table = kxtj9_id,
|
};
|
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module_i2c_driver(kxtj9_driver);
|
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MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
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MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
|
MODULE_LICENSE("GPL");
|
