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565 lines
13 KiB
565 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2011 Bosch Sensortec GmbH |
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* Copyright (c) 2011 Unixphere |
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* |
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* This driver adds support for Bosch Sensortec's digital acceleration |
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* sensors BMA150 and SMB380. |
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* The SMB380 is fully compatible with BMA150 and only differs in packaging. |
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* |
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* The datasheet for the BMA150 chip can be found here: |
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* http://www.bosch-sensortec.com/content/language1/downloads/BST-BMA150-DS000-07.pdf |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.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/delay.h> |
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#include <linux/slab.h> |
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#include <linux/pm.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/bma150.h> |
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#define ABSMAX_ACC_VAL 0x01FF |
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#define ABSMIN_ACC_VAL -(ABSMAX_ACC_VAL) |
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/* Each axis is represented by a 2-byte data word */ |
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#define BMA150_XYZ_DATA_SIZE 6 |
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/* Input poll interval in milliseconds */ |
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#define BMA150_POLL_INTERVAL 10 |
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#define BMA150_POLL_MAX 200 |
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#define BMA150_POLL_MIN 0 |
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#define BMA150_MODE_NORMAL 0 |
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#define BMA150_MODE_SLEEP 2 |
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#define BMA150_MODE_WAKE_UP 3 |
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|
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/* Data register addresses */ |
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#define BMA150_DATA_0_REG 0x00 |
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#define BMA150_DATA_1_REG 0x01 |
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#define BMA150_DATA_2_REG 0x02 |
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/* Control register addresses */ |
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#define BMA150_CTRL_0_REG 0x0A |
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#define BMA150_CTRL_1_REG 0x0B |
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#define BMA150_CTRL_2_REG 0x14 |
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#define BMA150_CTRL_3_REG 0x15 |
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|
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/* Configuration/Setting register addresses */ |
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#define BMA150_CFG_0_REG 0x0C |
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#define BMA150_CFG_1_REG 0x0D |
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#define BMA150_CFG_2_REG 0x0E |
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#define BMA150_CFG_3_REG 0x0F |
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#define BMA150_CFG_4_REG 0x10 |
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#define BMA150_CFG_5_REG 0x11 |
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#define BMA150_CHIP_ID 2 |
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#define BMA150_CHIP_ID_REG BMA150_DATA_0_REG |
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#define BMA150_ACC_X_LSB_REG BMA150_DATA_2_REG |
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#define BMA150_SLEEP_POS 0 |
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#define BMA150_SLEEP_MSK 0x01 |
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#define BMA150_SLEEP_REG BMA150_CTRL_0_REG |
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#define BMA150_BANDWIDTH_POS 0 |
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#define BMA150_BANDWIDTH_MSK 0x07 |
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#define BMA150_BANDWIDTH_REG BMA150_CTRL_2_REG |
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#define BMA150_RANGE_POS 3 |
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#define BMA150_RANGE_MSK 0x18 |
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#define BMA150_RANGE_REG BMA150_CTRL_2_REG |
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#define BMA150_WAKE_UP_POS 0 |
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#define BMA150_WAKE_UP_MSK 0x01 |
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#define BMA150_WAKE_UP_REG BMA150_CTRL_3_REG |
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#define BMA150_SW_RES_POS 1 |
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#define BMA150_SW_RES_MSK 0x02 |
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#define BMA150_SW_RES_REG BMA150_CTRL_0_REG |
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/* Any-motion interrupt register fields */ |
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#define BMA150_ANY_MOTION_EN_POS 6 |
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#define BMA150_ANY_MOTION_EN_MSK 0x40 |
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#define BMA150_ANY_MOTION_EN_REG BMA150_CTRL_1_REG |
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#define BMA150_ANY_MOTION_DUR_POS 6 |
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#define BMA150_ANY_MOTION_DUR_MSK 0xC0 |
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#define BMA150_ANY_MOTION_DUR_REG BMA150_CFG_5_REG |
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#define BMA150_ANY_MOTION_THRES_REG BMA150_CFG_4_REG |
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/* Advanced interrupt register fields */ |
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#define BMA150_ADV_INT_EN_POS 6 |
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#define BMA150_ADV_INT_EN_MSK 0x40 |
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#define BMA150_ADV_INT_EN_REG BMA150_CTRL_3_REG |
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/* High-G interrupt register fields */ |
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#define BMA150_HIGH_G_EN_POS 1 |
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#define BMA150_HIGH_G_EN_MSK 0x02 |
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#define BMA150_HIGH_G_EN_REG BMA150_CTRL_1_REG |
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#define BMA150_HIGH_G_HYST_POS 3 |
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#define BMA150_HIGH_G_HYST_MSK 0x38 |
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#define BMA150_HIGH_G_HYST_REG BMA150_CFG_5_REG |
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#define BMA150_HIGH_G_DUR_REG BMA150_CFG_3_REG |
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#define BMA150_HIGH_G_THRES_REG BMA150_CFG_2_REG |
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/* Low-G interrupt register fields */ |
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#define BMA150_LOW_G_EN_POS 0 |
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#define BMA150_LOW_G_EN_MSK 0x01 |
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#define BMA150_LOW_G_EN_REG BMA150_CTRL_1_REG |
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#define BMA150_LOW_G_HYST_POS 0 |
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#define BMA150_LOW_G_HYST_MSK 0x07 |
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#define BMA150_LOW_G_HYST_REG BMA150_CFG_5_REG |
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#define BMA150_LOW_G_DUR_REG BMA150_CFG_1_REG |
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#define BMA150_LOW_G_THRES_REG BMA150_CFG_0_REG |
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struct bma150_data { |
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struct i2c_client *client; |
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struct input_dev *input; |
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u8 mode; |
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}; |
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/* |
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* The settings for the given range, bandwidth and interrupt features |
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* are stated and verified by Bosch Sensortec where they are configured |
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* to provide a generic sensitivity performance. |
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*/ |
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static const struct bma150_cfg default_cfg = { |
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.any_motion_int = 1, |
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.hg_int = 1, |
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.lg_int = 1, |
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.any_motion_dur = 0, |
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.any_motion_thres = 0, |
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.hg_hyst = 0, |
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.hg_dur = 150, |
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.hg_thres = 160, |
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.lg_hyst = 0, |
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.lg_dur = 150, |
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.lg_thres = 20, |
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.range = BMA150_RANGE_2G, |
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.bandwidth = BMA150_BW_50HZ |
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}; |
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static int bma150_write_byte(struct i2c_client *client, u8 reg, u8 val) |
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{ |
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s32 ret; |
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/* As per specification, disable irq in between register writes */ |
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if (client->irq) |
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disable_irq_nosync(client->irq); |
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ret = i2c_smbus_write_byte_data(client, reg, val); |
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if (client->irq) |
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enable_irq(client->irq); |
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return ret; |
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} |
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static int bma150_set_reg_bits(struct i2c_client *client, |
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int val, int shift, u8 mask, u8 reg) |
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{ |
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int data; |
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data = i2c_smbus_read_byte_data(client, reg); |
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if (data < 0) |
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return data; |
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data = (data & ~mask) | ((val << shift) & mask); |
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return bma150_write_byte(client, reg, data); |
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} |
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static int bma150_set_mode(struct bma150_data *bma150, u8 mode) |
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{ |
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int error; |
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error = bma150_set_reg_bits(bma150->client, mode, BMA150_WAKE_UP_POS, |
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BMA150_WAKE_UP_MSK, BMA150_WAKE_UP_REG); |
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if (error) |
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return error; |
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error = bma150_set_reg_bits(bma150->client, mode, BMA150_SLEEP_POS, |
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BMA150_SLEEP_MSK, BMA150_SLEEP_REG); |
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if (error) |
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return error; |
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if (mode == BMA150_MODE_NORMAL) |
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usleep_range(2000, 2100); |
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bma150->mode = mode; |
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return 0; |
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} |
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static int bma150_soft_reset(struct bma150_data *bma150) |
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{ |
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int error; |
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error = bma150_set_reg_bits(bma150->client, 1, BMA150_SW_RES_POS, |
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BMA150_SW_RES_MSK, BMA150_SW_RES_REG); |
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if (error) |
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return error; |
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usleep_range(2000, 2100); |
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return 0; |
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} |
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static int bma150_set_range(struct bma150_data *bma150, u8 range) |
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{ |
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return bma150_set_reg_bits(bma150->client, range, BMA150_RANGE_POS, |
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BMA150_RANGE_MSK, BMA150_RANGE_REG); |
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} |
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static int bma150_set_bandwidth(struct bma150_data *bma150, u8 bw) |
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{ |
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return bma150_set_reg_bits(bma150->client, bw, BMA150_BANDWIDTH_POS, |
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BMA150_BANDWIDTH_MSK, BMA150_BANDWIDTH_REG); |
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} |
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static int bma150_set_low_g_interrupt(struct bma150_data *bma150, |
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u8 enable, u8 hyst, u8 dur, u8 thres) |
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{ |
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int error; |
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error = bma150_set_reg_bits(bma150->client, hyst, |
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BMA150_LOW_G_HYST_POS, BMA150_LOW_G_HYST_MSK, |
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BMA150_LOW_G_HYST_REG); |
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if (error) |
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return error; |
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error = bma150_write_byte(bma150->client, BMA150_LOW_G_DUR_REG, dur); |
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if (error) |
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return error; |
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error = bma150_write_byte(bma150->client, BMA150_LOW_G_THRES_REG, thres); |
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if (error) |
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return error; |
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return bma150_set_reg_bits(bma150->client, !!enable, |
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BMA150_LOW_G_EN_POS, BMA150_LOW_G_EN_MSK, |
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BMA150_LOW_G_EN_REG); |
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} |
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static int bma150_set_high_g_interrupt(struct bma150_data *bma150, |
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u8 enable, u8 hyst, u8 dur, u8 thres) |
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{ |
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int error; |
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error = bma150_set_reg_bits(bma150->client, hyst, |
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BMA150_HIGH_G_HYST_POS, BMA150_HIGH_G_HYST_MSK, |
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BMA150_HIGH_G_HYST_REG); |
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if (error) |
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return error; |
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error = bma150_write_byte(bma150->client, |
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BMA150_HIGH_G_DUR_REG, dur); |
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if (error) |
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return error; |
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error = bma150_write_byte(bma150->client, |
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BMA150_HIGH_G_THRES_REG, thres); |
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if (error) |
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return error; |
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return bma150_set_reg_bits(bma150->client, !!enable, |
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BMA150_HIGH_G_EN_POS, BMA150_HIGH_G_EN_MSK, |
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BMA150_HIGH_G_EN_REG); |
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} |
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static int bma150_set_any_motion_interrupt(struct bma150_data *bma150, |
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u8 enable, u8 dur, u8 thres) |
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{ |
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int error; |
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error = bma150_set_reg_bits(bma150->client, dur, |
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BMA150_ANY_MOTION_DUR_POS, |
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BMA150_ANY_MOTION_DUR_MSK, |
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BMA150_ANY_MOTION_DUR_REG); |
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if (error) |
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return error; |
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error = bma150_write_byte(bma150->client, |
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BMA150_ANY_MOTION_THRES_REG, thres); |
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if (error) |
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return error; |
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error = bma150_set_reg_bits(bma150->client, !!enable, |
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BMA150_ADV_INT_EN_POS, BMA150_ADV_INT_EN_MSK, |
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BMA150_ADV_INT_EN_REG); |
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if (error) |
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return error; |
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return bma150_set_reg_bits(bma150->client, !!enable, |
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BMA150_ANY_MOTION_EN_POS, |
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BMA150_ANY_MOTION_EN_MSK, |
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BMA150_ANY_MOTION_EN_REG); |
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} |
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static void bma150_report_xyz(struct bma150_data *bma150) |
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{ |
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u8 data[BMA150_XYZ_DATA_SIZE]; |
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s16 x, y, z; |
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s32 ret; |
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ret = i2c_smbus_read_i2c_block_data(bma150->client, |
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BMA150_ACC_X_LSB_REG, BMA150_XYZ_DATA_SIZE, data); |
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if (ret != BMA150_XYZ_DATA_SIZE) |
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return; |
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x = ((0xc0 & data[0]) >> 6) | (data[1] << 2); |
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y = ((0xc0 & data[2]) >> 6) | (data[3] << 2); |
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z = ((0xc0 & data[4]) >> 6) | (data[5] << 2); |
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x = sign_extend32(x, 9); |
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y = sign_extend32(y, 9); |
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z = sign_extend32(z, 9); |
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input_report_abs(bma150->input, ABS_X, x); |
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input_report_abs(bma150->input, ABS_Y, y); |
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input_report_abs(bma150->input, ABS_Z, z); |
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input_sync(bma150->input); |
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} |
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static irqreturn_t bma150_irq_thread(int irq, void *dev) |
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{ |
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bma150_report_xyz(dev); |
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return IRQ_HANDLED; |
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} |
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static void bma150_poll(struct input_dev *input) |
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{ |
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struct bma150_data *bma150 = input_get_drvdata(input); |
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bma150_report_xyz(bma150); |
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} |
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static int bma150_open(struct input_dev *input) |
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{ |
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struct bma150_data *bma150 = input_get_drvdata(input); |
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int error; |
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error = pm_runtime_get_sync(&bma150->client->dev); |
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if (error < 0 && error != -ENOSYS) |
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return error; |
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/* |
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* See if runtime PM woke up the device. If runtime PM |
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* is disabled we need to do it ourselves. |
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*/ |
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if (bma150->mode != BMA150_MODE_NORMAL) { |
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error = bma150_set_mode(bma150, BMA150_MODE_NORMAL); |
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if (error) |
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return error; |
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} |
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return 0; |
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} |
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static void bma150_close(struct input_dev *input) |
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{ |
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struct bma150_data *bma150 = input_get_drvdata(input); |
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pm_runtime_put_sync(&bma150->client->dev); |
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if (bma150->mode != BMA150_MODE_SLEEP) |
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bma150_set_mode(bma150, BMA150_MODE_SLEEP); |
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} |
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static int bma150_initialize(struct bma150_data *bma150, |
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const struct bma150_cfg *cfg) |
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{ |
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int error; |
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error = bma150_soft_reset(bma150); |
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if (error) |
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return error; |
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error = bma150_set_bandwidth(bma150, cfg->bandwidth); |
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if (error) |
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return error; |
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error = bma150_set_range(bma150, cfg->range); |
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if (error) |
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return error; |
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if (bma150->client->irq) { |
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error = bma150_set_any_motion_interrupt(bma150, |
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cfg->any_motion_int, |
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cfg->any_motion_dur, |
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cfg->any_motion_thres); |
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if (error) |
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return error; |
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error = bma150_set_high_g_interrupt(bma150, |
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cfg->hg_int, cfg->hg_hyst, |
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cfg->hg_dur, cfg->hg_thres); |
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if (error) |
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return error; |
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error = bma150_set_low_g_interrupt(bma150, |
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cfg->lg_int, cfg->lg_hyst, |
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cfg->lg_dur, cfg->lg_thres); |
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if (error) |
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return error; |
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} |
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return bma150_set_mode(bma150, BMA150_MODE_SLEEP); |
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} |
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static int bma150_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 bma150_platform_data *pdata = |
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dev_get_platdata(&client->dev); |
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const struct bma150_cfg *cfg; |
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struct bma150_data *bma150; |
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struct input_dev *idev; |
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int chip_id; |
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int error; |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
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dev_err(&client->dev, "i2c_check_functionality error\n"); |
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return -EIO; |
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} |
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chip_id = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG); |
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if (chip_id != BMA150_CHIP_ID) { |
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dev_err(&client->dev, "BMA150 chip id error: %d\n", chip_id); |
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return -EINVAL; |
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} |
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bma150 = devm_kzalloc(&client->dev, sizeof(*bma150), GFP_KERNEL); |
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if (!bma150) |
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return -ENOMEM; |
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bma150->client = client; |
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if (pdata) { |
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if (pdata->irq_gpio_cfg) { |
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error = pdata->irq_gpio_cfg(); |
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if (error) { |
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dev_err(&client->dev, |
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"IRQ GPIO conf. error %d, error %d\n", |
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client->irq, error); |
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return error; |
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} |
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} |
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cfg = &pdata->cfg; |
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} else { |
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cfg = &default_cfg; |
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} |
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error = bma150_initialize(bma150, cfg); |
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if (error) |
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return error; |
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idev = devm_input_allocate_device(&bma150->client->dev); |
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if (!idev) |
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return -ENOMEM; |
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input_set_drvdata(idev, bma150); |
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bma150->input = idev; |
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idev->name = BMA150_DRIVER; |
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idev->phys = BMA150_DRIVER "/input0"; |
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idev->id.bustype = BUS_I2C; |
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idev->open = bma150_open; |
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idev->close = bma150_close; |
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input_set_abs_params(idev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0); |
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input_set_abs_params(idev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0); |
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input_set_abs_params(idev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0); |
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if (client->irq <= 0) { |
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error = input_setup_polling(idev, bma150_poll); |
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if (error) |
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return error; |
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input_set_poll_interval(idev, BMA150_POLL_INTERVAL); |
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input_set_min_poll_interval(idev, BMA150_POLL_MIN); |
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input_set_max_poll_interval(idev, BMA150_POLL_MAX); |
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} |
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error = input_register_device(idev); |
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if (error) |
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return error; |
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if (client->irq > 0) { |
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error = devm_request_threaded_irq(&client->dev, client->irq, |
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NULL, bma150_irq_thread, |
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IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
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BMA150_DRIVER, bma150); |
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if (error) { |
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dev_err(&client->dev, |
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"irq request failed %d, error %d\n", |
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client->irq, error); |
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return error; |
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} |
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} |
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i2c_set_clientdata(client, bma150); |
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pm_runtime_enable(&client->dev); |
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return 0; |
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} |
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static int bma150_remove(struct i2c_client *client) |
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{ |
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pm_runtime_disable(&client->dev); |
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return 0; |
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} |
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static int __maybe_unused bma150_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 bma150_data *bma150 = i2c_get_clientdata(client); |
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return bma150_set_mode(bma150, BMA150_MODE_SLEEP); |
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} |
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static int __maybe_unused bma150_resume(struct device *dev) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct bma150_data *bma150 = i2c_get_clientdata(client); |
|
|
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return bma150_set_mode(bma150, BMA150_MODE_NORMAL); |
|
} |
|
|
|
static UNIVERSAL_DEV_PM_OPS(bma150_pm, bma150_suspend, bma150_resume, NULL); |
|
|
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static const struct i2c_device_id bma150_id[] = { |
|
{ "bma150", 0 }, |
|
{ "smb380", 0 }, |
|
{ "bma023", 0 }, |
|
{ } |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(i2c, bma150_id); |
|
|
|
static struct i2c_driver bma150_driver = { |
|
.driver = { |
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.name = BMA150_DRIVER, |
|
.pm = &bma150_pm, |
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}, |
|
.class = I2C_CLASS_HWMON, |
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.id_table = bma150_id, |
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.probe = bma150_probe, |
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.remove = bma150_remove, |
|
}; |
|
|
|
module_i2c_driver(bma150_driver); |
|
|
|
MODULE_AUTHOR("Albert Zhang <[email protected]>"); |
|
MODULE_DESCRIPTION("BMA150 driver"); |
|
MODULE_LICENSE("GPL");
|
|
|