674 lines
16 KiB
C
674 lines
16 KiB
C
/*
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* bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor
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*
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* Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/of.h>
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#include <linux/bitops.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#define BMA180_DRV_NAME "bma180"
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#define BMA180_IRQ_NAME "bma180_event"
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/* Register set */
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#define BMA180_CHIP_ID 0x00 /* Need to distinguish BMA180 from other */
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#define BMA180_ACC_X_LSB 0x02 /* First of 6 registers of accel data */
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#define BMA180_CTRL_REG0 0x0d
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#define BMA180_RESET 0x10
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#define BMA180_BW_TCS 0x20
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#define BMA180_CTRL_REG3 0x21
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#define BMA180_TCO_Z 0x30
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#define BMA180_OFFSET_LSB1 0x35
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/* BMA180_CTRL_REG0 bits */
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#define BMA180_DIS_WAKE_UP BIT(0) /* Disable wake up mode */
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#define BMA180_SLEEP BIT(1) /* 1 - chip will sleep */
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#define BMA180_EE_W BIT(4) /* Unlock writing to addr from 0x20 */
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#define BMA180_RESET_INT BIT(6) /* Reset pending interrupts */
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/* BMA180_CTRL_REG3 bits */
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#define BMA180_NEW_DATA_INT BIT(1) /* Intr every new accel data is ready */
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/* BMA180_OFFSET_LSB1 skipping mode bit */
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#define BMA180_SMP_SKIP BIT(0)
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/* Bit masks for registers bit fields */
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#define BMA180_RANGE 0x0e /* Range of measured accel values*/
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#define BMA180_BW 0xf0 /* Accel bandwidth */
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#define BMA180_MODE_CONFIG 0x03 /* Config operation modes */
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/* We have to write this value in reset register to do soft reset */
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#define BMA180_RESET_VAL 0xb6
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#define BMA_180_ID_REG_VAL 0x03
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/* Chip power modes */
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#define BMA180_LOW_NOISE 0x00
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#define BMA180_LOW_POWER 0x03
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#define BMA180_LOW_NOISE_STR "low_noise"
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#define BMA180_LOW_POWER_STR "low_power"
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/* Defaults values */
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#define BMA180_DEF_PMODE 0
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#define BMA180_DEF_BW 20
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#define BMA180_DEF_SCALE 250
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/* Available values for sysfs */
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#define BMA180_FLP_FREQ_AVAILABLE \
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"10 20 40 75 150 300"
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#define BMA180_SCALE_AVAILABLE \
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"0.000130 0.000190 0.000250 0.000380 0.000500 0.000990 0.001980"
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struct bma180_data {
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struct i2c_client *client;
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struct iio_trigger *trig;
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struct mutex mutex;
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int sleep_state;
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int scale;
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int bw;
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int pmode;
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char *buff;
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};
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enum bma180_axis {
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AXIS_X,
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AXIS_Y,
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AXIS_Z,
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};
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static int bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
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static int scale_table[] = { 130, 190, 250, 380, 500, 990, 1980 };
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static int bma180_get_acc_reg(struct bma180_data *data, enum bma180_axis axis)
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{
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u8 reg = BMA180_ACC_X_LSB + axis * 2;
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int ret;
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if (data->sleep_state)
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return -EBUSY;
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ret = i2c_smbus_read_word_data(data->client, reg);
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if (ret < 0)
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dev_err(&data->client->dev,
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"failed to read accel_%c registers\n", 'x' + axis);
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return ret;
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}
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static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val)
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{
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int ret = i2c_smbus_read_byte_data(data->client, reg);
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u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1));
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if (ret < 0)
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return ret;
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return i2c_smbus_write_byte_data(data->client, reg, reg_val);
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}
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static int bma180_reset_intr(struct bma180_data *data)
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{
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int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_RESET_INT, 1);
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if (ret)
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dev_err(&data->client->dev, "failed to reset interrupt\n");
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return ret;
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}
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static int bma180_set_new_data_intr_state(struct bma180_data *data, int state)
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{
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u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00;
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int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3,
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reg_val);
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if (ret)
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goto err;
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ret = bma180_reset_intr(data);
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if (ret)
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goto err;
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return 0;
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err:
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dev_err(&data->client->dev,
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"failed to set new data interrupt state %d\n", state);
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return ret;
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}
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static int bma180_set_sleep_state(struct bma180_data *data, int state)
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{
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int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP, state);
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if (ret) {
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dev_err(&data->client->dev,
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"failed to set sleep state %d\n", state);
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return ret;
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}
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data->sleep_state = state;
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return 0;
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}
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static int bma180_set_ee_writing_state(struct bma180_data *data, int state)
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{
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int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state);
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if (ret)
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dev_err(&data->client->dev,
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"failed to set ee writing state %d\n", state);
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return ret;
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}
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static int bma180_set_bw(struct bma180_data *data, int val)
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{
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int ret, i;
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if (data->sleep_state)
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return -EBUSY;
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for (i = 0; i < ARRAY_SIZE(bw_table); ++i) {
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if (bw_table[i] == val) {
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ret = bma180_set_bits(data,
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BMA180_BW_TCS, BMA180_BW, i);
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if (ret) {
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dev_err(&data->client->dev,
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"failed to set bandwidth\n");
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return ret;
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}
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data->bw = val;
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return 0;
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}
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}
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return -EINVAL;
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}
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static int bma180_set_scale(struct bma180_data *data, int val)
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{
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int ret, i;
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if (data->sleep_state)
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return -EBUSY;
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for (i = 0; i < ARRAY_SIZE(scale_table); ++i)
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if (scale_table[i] == val) {
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ret = bma180_set_bits(data,
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BMA180_OFFSET_LSB1, BMA180_RANGE, i);
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if (ret) {
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dev_err(&data->client->dev,
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"failed to set scale\n");
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return ret;
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}
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data->scale = val;
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return 0;
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}
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return -EINVAL;
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}
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static int bma180_set_pmode(struct bma180_data *data, int mode)
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{
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u8 reg_val = mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE;
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int ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG,
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reg_val);
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if (ret) {
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dev_err(&data->client->dev, "failed to set power mode\n");
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return ret;
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}
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data->pmode = mode;
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return 0;
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}
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static int bma180_soft_reset(struct bma180_data *data)
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{
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int ret = i2c_smbus_write_byte_data(data->client,
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BMA180_RESET, BMA180_RESET_VAL);
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if (ret)
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dev_err(&data->client->dev, "failed to reset the chip\n");
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return ret;
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}
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static int bma180_chip_init(struct bma180_data *data)
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{
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/* Try to read chip_id register. It must return 0x03. */
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int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID);
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if (ret < 0)
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goto err;
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if (ret != BMA_180_ID_REG_VAL) {
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ret = -ENODEV;
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goto err;
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}
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ret = bma180_soft_reset(data);
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if (ret)
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goto err;
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/*
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* No serial transaction should occur within minimum 10 us
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* after soft_reset command
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*/
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msleep(20);
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ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1);
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if (ret)
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goto err;
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ret = bma180_set_ee_writing_state(data, 1);
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if (ret)
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goto err;
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ret = bma180_set_new_data_intr_state(data, 0);
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if (ret)
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goto err;
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ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
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if (ret)
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goto err;
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ret = bma180_set_pmode(data, BMA180_DEF_PMODE);
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if (ret)
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goto err;
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ret = bma180_set_bw(data, BMA180_DEF_BW);
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if (ret)
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goto err;
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ret = bma180_set_scale(data, BMA180_DEF_SCALE);
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if (ret)
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goto err;
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return 0;
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err:
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dev_err(&data->client->dev, "failed to init the chip\n");
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return ret;
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}
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static void bma180_chip_disable(struct bma180_data *data)
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{
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if (bma180_set_new_data_intr_state(data, 0))
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goto err;
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if (bma180_set_ee_writing_state(data, 0))
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goto err;
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if (bma180_set_sleep_state(data, 1))
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goto err;
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return;
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err:
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dev_err(&data->client->dev, "failed to disable the chip\n");
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}
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static IIO_CONST_ATTR(in_accel_filter_low_pass_3db_frequency_available,
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BMA180_FLP_FREQ_AVAILABLE);
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static IIO_CONST_ATTR(in_accel_scale_available, BMA180_SCALE_AVAILABLE);
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static struct attribute *bma180_attributes[] = {
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&iio_const_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
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&iio_const_attr_in_accel_scale_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group bma180_attrs_group = {
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.attrs = bma180_attributes,
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};
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static int bma180_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val, int *val2,
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long mask)
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{
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struct bma180_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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mutex_lock(&data->mutex);
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if (iio_buffer_enabled(indio_dev))
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ret = -EBUSY;
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else
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ret = bma180_get_acc_reg(data, chan->scan_index);
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mutex_unlock(&data->mutex);
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if (ret < 0)
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return ret;
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*val = (s16)ret >> chan->scan_type.shift;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
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*val = data->bw;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = data->scale;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static int bma180_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val, int val2, long mask)
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{
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struct bma180_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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if (val)
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return -EINVAL;
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mutex_lock(&data->mutex);
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ret = bma180_set_scale(data, val2);
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mutex_unlock(&data->mutex);
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return ret;
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case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
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mutex_lock(&data->mutex);
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ret = bma180_set_bw(data, val);
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mutex_unlock(&data->mutex);
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return ret;
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default:
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return -EINVAL;
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}
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}
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static int bma180_update_scan_mode(struct iio_dev *indio_dev,
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const unsigned long *scan_mask)
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{
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struct bma180_data *data = iio_priv(indio_dev);
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if (data->buff)
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devm_kfree(&indio_dev->dev, data->buff);
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data->buff = devm_kzalloc(&indio_dev->dev,
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indio_dev->scan_bytes, GFP_KERNEL);
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if (!data->buff)
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return -ENOMEM;
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return 0;
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}
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static const struct iio_info bma180_info = {
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.attrs = &bma180_attrs_group,
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.read_raw = bma180_read_raw,
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.write_raw = bma180_write_raw,
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.update_scan_mode = bma180_update_scan_mode,
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.driver_module = THIS_MODULE,
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};
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static const char * const bma180_power_modes[] = {
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BMA180_LOW_NOISE_STR,
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BMA180_LOW_POWER_STR,
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};
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static int bma180_get_power_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan)
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{
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struct bma180_data *data = iio_priv(indio_dev);
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return data->pmode;
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}
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static int bma180_set_power_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, unsigned int mode)
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{
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struct bma180_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->mutex);
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ret = bma180_set_pmode(data, mode);
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mutex_unlock(&data->mutex);
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return ret;
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}
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static const struct iio_enum bma180_power_mode_enum = {
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.items = bma180_power_modes,
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.num_items = ARRAY_SIZE(bma180_power_modes),
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.get = bma180_get_power_mode,
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.set = bma180_set_power_mode,
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};
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static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
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IIO_ENUM("power_mode", true, &bma180_power_mode_enum),
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IIO_ENUM_AVAILABLE("power_mode", &bma180_power_mode_enum),
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{ },
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};
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#define BMA180_CHANNEL(_index) { \
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.type = IIO_ACCEL, \
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.indexed = 1, \
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.channel = (_index), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.scan_index = (_index), \
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.scan_type = IIO_ST('s', 14, 16, 2), \
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.ext_info = bma180_ext_info, \
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}
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static const struct iio_chan_spec bma180_channels[] = {
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BMA180_CHANNEL(AXIS_X),
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BMA180_CHANNEL(AXIS_Y),
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BMA180_CHANNEL(AXIS_Z),
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static irqreturn_t bma180_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct bma180_data *data = iio_priv(indio_dev);
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int64_t time_ns = iio_get_time_ns();
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int bit, ret, i = 0;
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mutex_lock(&data->mutex);
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for_each_set_bit(bit, indio_dev->buffer->scan_mask,
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indio_dev->masklength) {
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ret = bma180_get_acc_reg(data, bit);
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if (ret < 0) {
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mutex_unlock(&data->mutex);
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goto err;
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}
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((s16 *)data->buff)[i++] = ret;
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}
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mutex_unlock(&data->mutex);
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iio_push_to_buffers_with_timestamp(indio_dev, data->buff, time_ns);
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err:
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static int bma180_data_rdy_trigger_set_state(struct iio_trigger *trig,
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bool state)
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{
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struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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struct bma180_data *data = iio_priv(indio_dev);
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return bma180_set_new_data_intr_state(data, state);
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}
|
|
|
|
static int bma180_trig_try_reen(struct iio_trigger *trig)
|
|
{
|
|
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
|
|
struct bma180_data *data = iio_priv(indio_dev);
|
|
|
|
return bma180_reset_intr(data);
|
|
}
|
|
|
|
static const struct iio_trigger_ops bma180_trigger_ops = {
|
|
.set_trigger_state = bma180_data_rdy_trigger_set_state,
|
|
.try_reenable = bma180_trig_try_reen,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int bma180_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct bma180_data *data;
|
|
struct iio_dev *indio_dev;
|
|
struct iio_trigger *trig;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
data = iio_priv(indio_dev);
|
|
i2c_set_clientdata(client, indio_dev);
|
|
data->client = client;
|
|
|
|
ret = bma180_chip_init(data);
|
|
if (ret < 0)
|
|
goto err_chip_disable;
|
|
|
|
mutex_init(&data->mutex);
|
|
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->channels = bma180_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(bma180_channels);
|
|
indio_dev->name = BMA180_DRV_NAME;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->info = &bma180_info;
|
|
|
|
trig = iio_trigger_alloc("%s-dev%d", indio_dev->name, indio_dev->id);
|
|
if (!trig) {
|
|
ret = -ENOMEM;
|
|
goto err_chip_disable;
|
|
}
|
|
|
|
ret = devm_request_irq(&client->dev, client->irq,
|
|
iio_trigger_generic_data_rdy_poll,
|
|
IRQF_TRIGGER_RISING, BMA180_IRQ_NAME, trig);
|
|
if (ret) {
|
|
dev_err(&client->dev, "unable to request IRQ\n");
|
|
goto err_trigger_free;
|
|
}
|
|
|
|
trig->dev.parent = &client->dev;
|
|
trig->ops = &bma180_trigger_ops;
|
|
iio_trigger_set_drvdata(trig, indio_dev);
|
|
data->trig = trig;
|
|
indio_dev->trig = trig;
|
|
|
|
ret = iio_trigger_register(trig);
|
|
if (ret)
|
|
goto err_trigger_free;
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, NULL,
|
|
bma180_trigger_handler, NULL);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "unable to setup iio triggered buffer\n");
|
|
goto err_trigger_unregister;
|
|
}
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "unable to register iio device\n");
|
|
goto err_buffer_cleanup;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_buffer_cleanup:
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
err_trigger_unregister:
|
|
iio_trigger_unregister(trig);
|
|
err_trigger_free:
|
|
iio_trigger_free(trig);
|
|
err_chip_disable:
|
|
bma180_chip_disable(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bma180_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
struct bma180_data *data = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
iio_trigger_unregister(data->trig);
|
|
iio_trigger_free(data->trig);
|
|
|
|
mutex_lock(&data->mutex);
|
|
bma180_chip_disable(data);
|
|
mutex_unlock(&data->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int bma180_suspend(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
struct bma180_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&data->mutex);
|
|
ret = bma180_set_sleep_state(data, 1);
|
|
mutex_unlock(&data->mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bma180_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
struct bma180_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&data->mutex);
|
|
ret = bma180_set_sleep_state(data, 0);
|
|
mutex_unlock(&data->mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
|
|
#define BMA180_PM_OPS (&bma180_pm_ops)
|
|
#else
|
|
#define BMA180_PM_OPS NULL
|
|
#endif
|
|
|
|
static struct i2c_device_id bma180_id[] = {
|
|
{ BMA180_DRV_NAME, 0 },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, bma180_id);
|
|
|
|
static struct i2c_driver bma180_driver = {
|
|
.driver = {
|
|
.name = BMA180_DRV_NAME,
|
|
.owner = THIS_MODULE,
|
|
.pm = BMA180_PM_OPS,
|
|
},
|
|
.probe = bma180_probe,
|
|
.remove = bma180_remove,
|
|
.id_table = bma180_id,
|
|
};
|
|
|
|
module_i2c_driver(bma180_driver);
|
|
|
|
MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");
|
|
MODULE_AUTHOR("Texas Instruments, Inc.");
|
|
MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");
|
|
MODULE_LICENSE("GPL");
|