/drivers/staging/iio/accel/adis16204_core.c
https://bitbucket.org/slukk/jb-tsm-kernel-4.2 · C · 611 lines · 509 code · 68 blank · 34 comment · 48 complexity · 22d0480e9d5508c61ab560c61bcc719e MD5 · raw file
- /*
- * ADIS16204 Programmable High-g Digital Impact Sensor and Recorder
- *
- * Copyright 2010 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
- #include <linux/interrupt.h>
- #include <linux/irq.h>
- #include <linux/gpio.h>
- #include <linux/delay.h>
- #include <linux/mutex.h>
- #include <linux/device.h>
- #include <linux/kernel.h>
- #include <linux/spi/spi.h>
- #include <linux/slab.h>
- #include <linux/sysfs.h>
- #include <linux/list.h>
- #include "../iio.h"
- #include "../sysfs.h"
- #include "../ring_generic.h"
- #include "accel.h"
- #include "../adc/adc.h"
- #include "adis16204.h"
- #define DRIVER_NAME "adis16204"
- /**
- * adis16204_spi_write_reg_8() - write single byte to a register
- * @dev: device associated with child of actual device (iio_dev or iio_trig)
- * @reg_address: the address of the register to be written
- * @val: the value to write
- **/
- static int adis16204_spi_write_reg_8(struct iio_dev *indio_dev,
- u8 reg_address,
- u8 val)
- {
- int ret;
- struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
- mutex_lock(&st->buf_lock);
- st->tx[0] = ADIS16204_WRITE_REG(reg_address);
- st->tx[1] = val;
- ret = spi_write(st->us, st->tx, 2);
- mutex_unlock(&st->buf_lock);
- return ret;
- }
- /**
- * adis16204_spi_write_reg_16() - write 2 bytes to a pair of registers
- * @indio_dev: iio device associated with child of actual device
- * @reg_address: the address of the lower of the two registers. Second register
- * is assumed to have address one greater.
- * @val: value to be written
- **/
- static int adis16204_spi_write_reg_16(struct iio_dev *indio_dev,
- u8 lower_reg_address,
- u16 value)
- {
- int ret;
- struct spi_message msg;
- struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
- struct spi_transfer xfers[] = {
- {
- .tx_buf = st->tx,
- .bits_per_word = 8,
- .len = 2,
- .cs_change = 1,
- }, {
- .tx_buf = st->tx + 2,
- .bits_per_word = 8,
- .len = 2,
- .cs_change = 1,
- },
- };
- mutex_lock(&st->buf_lock);
- st->tx[0] = ADIS16204_WRITE_REG(lower_reg_address);
- st->tx[1] = value & 0xFF;
- st->tx[2] = ADIS16204_WRITE_REG(lower_reg_address + 1);
- st->tx[3] = (value >> 8) & 0xFF;
- spi_message_init(&msg);
- spi_message_add_tail(&xfers[0], &msg);
- spi_message_add_tail(&xfers[1], &msg);
- ret = spi_sync(st->us, &msg);
- mutex_unlock(&st->buf_lock);
- return ret;
- }
- /**
- * adis16204_spi_read_reg_16() - read 2 bytes from a 16-bit register
- * @indio_dev: iio device associated with child of actual device
- * @reg_address: the address of the lower of the two registers. Second register
- * is assumed to have address one greater.
- * @val: somewhere to pass back the value read
- **/
- static int adis16204_spi_read_reg_16(struct iio_dev *indio_dev,
- u8 lower_reg_address,
- u16 *val)
- {
- struct spi_message msg;
- struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
- int ret;
- struct spi_transfer xfers[] = {
- {
- .tx_buf = st->tx,
- .bits_per_word = 8,
- .len = 2,
- .cs_change = 1,
- .delay_usecs = 20,
- }, {
- .rx_buf = st->rx,
- .bits_per_word = 8,
- .len = 2,
- .delay_usecs = 20,
- },
- };
- mutex_lock(&st->buf_lock);
- st->tx[0] = ADIS16204_READ_REG(lower_reg_address);
- st->tx[1] = 0;
- spi_message_init(&msg);
- spi_message_add_tail(&xfers[0], &msg);
- spi_message_add_tail(&xfers[1], &msg);
- ret = spi_sync(st->us, &msg);
- if (ret) {
- dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
- lower_reg_address);
- goto error_ret;
- }
- *val = (st->rx[0] << 8) | st->rx[1];
- error_ret:
- mutex_unlock(&st->buf_lock);
- return ret;
- }
- static int adis16204_check_status(struct iio_dev *indio_dev)
- {
- u16 status;
- int ret;
- ret = adis16204_spi_read_reg_16(indio_dev,
- ADIS16204_DIAG_STAT, &status);
- if (ret < 0) {
- dev_err(&indio_dev->dev, "Reading status failed\n");
- goto error_ret;
- }
- ret = status & 0x1F;
- if (status & ADIS16204_DIAG_STAT_SELFTEST_FAIL)
- dev_err(&indio_dev->dev, "Self test failure\n");
- if (status & ADIS16204_DIAG_STAT_SPI_FAIL)
- dev_err(&indio_dev->dev, "SPI failure\n");
- if (status & ADIS16204_DIAG_STAT_FLASH_UPT)
- dev_err(&indio_dev->dev, "Flash update failed\n");
- if (status & ADIS16204_DIAG_STAT_POWER_HIGH)
- dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
- if (status & ADIS16204_DIAG_STAT_POWER_LOW)
- dev_err(&indio_dev->dev, "Power supply below 2.975V\n");
- error_ret:
- return ret;
- }
- static ssize_t adis16204_read_14bit_signed(struct device *dev,
- struct device_attribute *attr,
- char *buf)
- {
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- s16 val = 0;
- ssize_t ret;
- mutex_lock(&indio_dev->mlock);
- ret = adis16204_spi_read_reg_16(indio_dev,
- this_attr->address, (u16 *)&val);
- if (!ret) {
- if (val & ADIS16204_ERROR_ACTIVE)
- adis16204_check_status(indio_dev);
- val = ((s16)(val << 2) >> 2);
- ret = sprintf(buf, "%d\n", val);
- }
- mutex_unlock(&indio_dev->mlock);
- return ret;
- }
- static int adis16204_reset(struct iio_dev *indio_dev)
- {
- int ret;
- ret = adis16204_spi_write_reg_8(indio_dev,
- ADIS16204_GLOB_CMD,
- ADIS16204_GLOB_CMD_SW_RESET);
- if (ret)
- dev_err(&indio_dev->dev, "problem resetting device");
- return ret;
- }
- static ssize_t adis16204_write_reset(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t len)
- {
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- if (len < 1)
- return -EINVAL;
- switch (buf[0]) {
- case '1':
- case 'y':
- case 'Y':
- return adis16204_reset(indio_dev);
- }
- return -EINVAL;
- }
- int adis16204_set_irq(struct iio_dev *indio_dev, bool enable)
- {
- int ret = 0;
- u16 msc;
- ret = adis16204_spi_read_reg_16(indio_dev, ADIS16204_MSC_CTRL, &msc);
- if (ret)
- goto error_ret;
- msc |= ADIS16204_MSC_CTRL_ACTIVE_HIGH;
- msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_DIO2;
- if (enable)
- msc |= ADIS16204_MSC_CTRL_DATA_RDY_EN;
- else
- msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_EN;
- ret = adis16204_spi_write_reg_16(indio_dev, ADIS16204_MSC_CTRL, msc);
- error_ret:
- return ret;
- }
- static int adis16204_self_test(struct iio_dev *indio_dev)
- {
- int ret;
- ret = adis16204_spi_write_reg_16(indio_dev,
- ADIS16204_MSC_CTRL,
- ADIS16204_MSC_CTRL_SELF_TEST_EN);
- if (ret) {
- dev_err(&indio_dev->dev, "problem starting self test");
- goto err_ret;
- }
- adis16204_check_status(indio_dev);
- err_ret:
- return ret;
- }
- static int adis16204_initial_setup(struct iio_dev *indio_dev)
- {
- int ret;
- /* Disable IRQ */
- ret = adis16204_set_irq(indio_dev, false);
- if (ret) {
- dev_err(&indio_dev->dev, "disable irq failed");
- goto err_ret;
- }
- /* Do self test */
- ret = adis16204_self_test(indio_dev);
- if (ret) {
- dev_err(&indio_dev->dev, "self test failure");
- goto err_ret;
- }
- /* Read status register to check the result */
- ret = adis16204_check_status(indio_dev);
- if (ret) {
- adis16204_reset(indio_dev);
- dev_err(&indio_dev->dev, "device not playing ball -> reset");
- msleep(ADIS16204_STARTUP_DELAY);
- ret = adis16204_check_status(indio_dev);
- if (ret) {
- dev_err(&indio_dev->dev, "giving up");
- goto err_ret;
- }
- }
- err_ret:
- return ret;
- }
- static IIO_DEV_ATTR_ACCEL_XY(adis16204_read_14bit_signed,
- ADIS16204_XY_RSS_OUT);
- static IIO_DEV_ATTR_ACCEL_XPEAK(adis16204_read_14bit_signed,
- ADIS16204_X_PEAK_OUT);
- static IIO_DEV_ATTR_ACCEL_YPEAK(adis16204_read_14bit_signed,
- ADIS16204_Y_PEAK_OUT);
- static IIO_DEV_ATTR_ACCEL_XYPEAK(adis16204_read_14bit_signed,
- ADIS16204_XY_PEAK_OUT);
- static IIO_CONST_ATTR(accel_xy_scale, "0.017125");
- static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16204_write_reset, 0);
- enum adis16204_channel {
- in_supply,
- in_aux,
- temp,
- accel_x,
- accel_y,
- };
- static u8 adis16204_addresses[5][2] = {
- [in_supply] = { ADIS16204_SUPPLY_OUT },
- [in_aux] = { ADIS16204_AUX_ADC },
- [temp] = { ADIS16204_TEMP_OUT },
- [accel_x] = { ADIS16204_XACCL_OUT, ADIS16204_XACCL_NULL },
- [accel_y] = { ADIS16204_XACCL_OUT, ADIS16204_YACCL_NULL },
- };
- static int adis16204_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val, int *val2,
- long mask)
- {
- int ret;
- int bits;
- u8 addr;
- s16 val16;
- switch (mask) {
- case 0:
- mutex_lock(&indio_dev->mlock);
- addr = adis16204_addresses[chan->address][0];
- ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
- if (ret)
- return ret;
- if (val16 & ADIS16204_ERROR_ACTIVE) {
- ret = adis16204_check_status(indio_dev);
- if (ret)
- return ret;
- }
- val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
- if (chan->scan_type.sign == 's')
- val16 = (s16)(val16 <<
- (16 - chan->scan_type.realbits)) >>
- (16 - chan->scan_type.realbits);
- *val = val16;
- mutex_unlock(&indio_dev->mlock);
- return IIO_VAL_INT;
- case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
- switch (chan->type) {
- case IIO_IN:
- *val = 0;
- if (chan->channel == 0)
- *val2 = 1220;
- else
- *val2 = 610;
- return IIO_VAL_INT_PLUS_MICRO;
- case IIO_TEMP:
- *val = 0;
- *val2 = -470000;
- return IIO_VAL_INT_PLUS_MICRO;
- case IIO_ACCEL:
- *val = 0;
- if (chan->channel == 'x')
- *val2 = 17125;
- else
- *val2 = 8407;
- return IIO_VAL_INT_PLUS_MICRO;
- default:
- return -EINVAL;
- }
- break;
- case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
- *val = 25;
- return IIO_VAL_INT;
- case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
- switch (chan->type) {
- case IIO_ACCEL:
- bits = 12;
- break;
- default:
- return -EINVAL;
- };
- mutex_lock(&indio_dev->mlock);
- addr = adis16204_addresses[chan->address][1];
- ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
- if (ret) {
- mutex_unlock(&indio_dev->mlock);
- return ret;
- }
- val16 &= (1 << bits) - 1;
- val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
- *val = val16;
- mutex_unlock(&indio_dev->mlock);
- return IIO_VAL_INT;
- }
- return -EINVAL;
- }
- static int adis16204_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val,
- int val2,
- long mask)
- {
- int bits;
- s16 val16;
- u8 addr;
- switch (mask) {
- case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
- switch (chan->type) {
- case IIO_ACCEL:
- bits = 12;
- break;
- default:
- return -EINVAL;
- };
- val16 = val & ((1 << bits) - 1);
- addr = adis16204_addresses[chan->address][1];
- return adis16204_spi_write_reg_16(indio_dev, addr, val16);
- }
- return -EINVAL;
- }
- static struct iio_chan_spec adis16204_channels[] = {
- IIO_CHAN(IIO_IN, 0, 0, 0, "supply", 0, 0,
- (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
- in_supply, ADIS16204_SCAN_SUPPLY,
- IIO_ST('u', 12, 16, 0), 0),
- IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
- (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
- in_aux, ADIS16204_SCAN_AUX_ADC,
- IIO_ST('u', 12, 16, 0), 0),
- IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
- (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_OFFSET_SEPARATE),
- temp, ADIS16204_SCAN_TEMP,
- IIO_ST('u', 12, 16, 0), 0),
- IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
- (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
- accel_x, ADIS16204_SCAN_ACC_X,
- IIO_ST('s', 14, 16, 0), 0),
- IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
- (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
- (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
- accel_y, ADIS16204_SCAN_ACC_Y,
- IIO_ST('s', 14, 16, 0), 0),
- IIO_CHAN_SOFT_TIMESTAMP(5),
- };
- static struct attribute *adis16204_attributes[] = {
- &iio_dev_attr_reset.dev_attr.attr,
- &iio_dev_attr_accel_xy.dev_attr.attr,
- &iio_dev_attr_accel_xpeak.dev_attr.attr,
- &iio_dev_attr_accel_ypeak.dev_attr.attr,
- &iio_dev_attr_accel_xypeak.dev_attr.attr,
- &iio_const_attr_accel_xy_scale.dev_attr.attr,
- NULL
- };
- static const struct attribute_group adis16204_attribute_group = {
- .attrs = adis16204_attributes,
- };
- static const struct iio_info adis16204_info = {
- .attrs = &adis16204_attribute_group,
- .read_raw = &adis16204_read_raw,
- .write_raw = &adis16204_write_raw,
- .driver_module = THIS_MODULE,
- };
- static int __devinit adis16204_probe(struct spi_device *spi)
- {
- int ret, regdone = 0;
- struct adis16204_state *st = kzalloc(sizeof *st, GFP_KERNEL);
- if (!st) {
- ret = -ENOMEM;
- goto error_ret;
- }
- /* this is only used for removal purposes */
- spi_set_drvdata(spi, st);
- /* Allocate the comms buffers */
- st->rx = kzalloc(sizeof(*st->rx)*ADIS16204_MAX_RX, GFP_KERNEL);
- if (st->rx == NULL) {
- ret = -ENOMEM;
- goto error_free_st;
- }
- st->tx = kzalloc(sizeof(*st->tx)*ADIS16204_MAX_TX, GFP_KERNEL);
- if (st->tx == NULL) {
- ret = -ENOMEM;
- goto error_free_rx;
- }
- st->us = spi;
- mutex_init(&st->buf_lock);
- /* setup the industrialio driver allocated elements */
- st->indio_dev = iio_allocate_device(0);
- if (st->indio_dev == NULL) {
- ret = -ENOMEM;
- goto error_free_tx;
- }
- st->indio_dev->name = spi->dev.driver->name;
- st->indio_dev->dev.parent = &spi->dev;
- st->indio_dev->info = &adis16204_info;
- st->indio_dev->channels = adis16204_channels;
- st->indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
- st->indio_dev->dev_data = (void *)(st);
- st->indio_dev->modes = INDIO_DIRECT_MODE;
- ret = adis16204_configure_ring(st->indio_dev);
- if (ret)
- goto error_free_dev;
- ret = iio_device_register(st->indio_dev);
- if (ret)
- goto error_unreg_ring_funcs;
- regdone = 1;
- ret = iio_ring_buffer_register_ex(st->indio_dev->ring, 0,
- adis16204_channels,
- ARRAY_SIZE(adis16204_channels));
- if (ret) {
- printk(KERN_ERR "failed to initialize the ring\n");
- goto error_unreg_ring_funcs;
- }
- if (spi->irq) {
- ret = adis16204_probe_trigger(st->indio_dev);
- if (ret)
- goto error_uninitialize_ring;
- }
- /* Get the device into a sane initial state */
- ret = adis16204_initial_setup(st->indio_dev);
- if (ret)
- goto error_remove_trigger;
- return 0;
- error_remove_trigger:
- adis16204_remove_trigger(st->indio_dev);
- error_uninitialize_ring:
- iio_ring_buffer_unregister(st->indio_dev->ring);
- error_unreg_ring_funcs:
- adis16204_unconfigure_ring(st->indio_dev);
- error_free_dev:
- if (regdone)
- iio_device_unregister(st->indio_dev);
- else
- iio_free_device(st->indio_dev);
- error_free_tx:
- kfree(st->tx);
- error_free_rx:
- kfree(st->rx);
- error_free_st:
- kfree(st);
- error_ret:
- return ret;
- }
- static int adis16204_remove(struct spi_device *spi)
- {
- struct adis16204_state *st = spi_get_drvdata(spi);
- struct iio_dev *indio_dev = st->indio_dev;
- adis16204_remove_trigger(indio_dev);
- iio_ring_buffer_unregister(st->indio_dev->ring);
- iio_device_unregister(indio_dev);
- adis16204_unconfigure_ring(indio_dev);
- kfree(st->tx);
- kfree(st->rx);
- kfree(st);
- return 0;
- }
- static struct spi_driver adis16204_driver = {
- .driver = {
- .name = "adis16204",
- .owner = THIS_MODULE,
- },
- .probe = adis16204_probe,
- .remove = __devexit_p(adis16204_remove),
- };
- static __init int adis16204_init(void)
- {
- return spi_register_driver(&adis16204_driver);
- }
- module_init(adis16204_init);
- static __exit void adis16204_exit(void)
- {
- spi_unregister_driver(&adis16204_driver);
- }
- module_exit(adis16204_exit);
- MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
- MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
- MODULE_LICENSE("GPL v2");