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path: root/drivers/staging/iio/accel/adis16220_core.c
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Diffstat (limited to 'drivers/staging/iio/accel/adis16220_core.c')
-rw-r--r--drivers/staging/iio/accel/adis16220_core.c670
1 files changed, 670 insertions, 0 deletions
diff --git a/drivers/staging/iio/accel/adis16220_core.c b/drivers/staging/iio/accel/adis16220_core.c
new file mode 100644
index 000000000000..6de439fd1675
--- /dev/null
+++ b/drivers/staging/iio/accel/adis16220_core.c
@@ -0,0 +1,670 @@
+/*
+ * ADIS16220 Programmable Digital Vibration Sensor driver
+ *
+ * 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/sysfs.h>
+#include <linux/list.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+#include "accel.h"
+#include "../adc/adc.h"
+
+#include "adis16220.h"
+
+#define DRIVER_NAME "adis16220"
+
+/**
+ * adis16220_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 adis16220_spi_write_reg_8(struct device *dev,
+ u8 reg_address,
+ u8 val)
+{
+ int ret;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADIS16220_WRITE_REG(reg_address);
+ st->tx[1] = val;
+
+ ret = spi_write(st->us, st->tx, 2);
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+/**
+ * adis16220_spi_write_reg_16() - write 2 bytes to a pair of registers
+ * @dev: device associated with child of actual device (iio_dev or iio_trig)
+ * @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 adis16220_spi_write_reg_16(struct device *dev,
+ u8 lower_reg_address,
+ u16 value)
+{
+ int ret;
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16220_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,
+ .delay_usecs = 25,
+ }, {
+ .tx_buf = st->tx + 2,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ .delay_usecs = 25,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADIS16220_WRITE_REG(lower_reg_address);
+ st->tx[1] = value & 0xFF;
+ st->tx[2] = ADIS16220_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;
+}
+
+/**
+ * adis16220_spi_read_reg_16() - read 2 bytes from a 16-bit register
+ * @dev: device associated with child of actual device (iio_dev or iio_trig)
+ * @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 adis16220_spi_read_reg_16(struct device *dev,
+ u8 lower_reg_address,
+ u16 *val)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16220_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 = 25,
+ }, {
+ .rx_buf = st->rx,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ .delay_usecs = 25,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADIS16220_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 ssize_t adis16220_spi_read_signed(struct device *dev,
+ struct device_attribute *attr,
+ char *buf,
+ unsigned bits)
+{
+ int ret;
+ s16 val = 0;
+ unsigned shift = 16 - bits;
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+
+ ret = adis16220_spi_read_reg_16(dev, this_attr->address, (u16 *)&val);
+ if (ret)
+ return ret;
+
+ val = ((s16)(val << shift) >> shift);
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t adis16220_read_12bit_unsigned(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u16 val = 0;
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+
+ ret = adis16220_spi_read_reg_16(dev, this_attr->address, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%u\n", val & 0x0FFF);
+}
+
+static ssize_t adis16220_read_16bit(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ ssize_t ret;
+
+ /* Take the iio_dev status lock */
+ mutex_lock(&indio_dev->mlock);
+ ret = adis16220_spi_read_signed(dev, attr, buf, 16);
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret;
+}
+
+static ssize_t adis16220_write_16bit(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int ret;
+ long val;
+
+ ret = strict_strtol(buf, 10, &val);
+ if (ret)
+ goto error_ret;
+ ret = adis16220_spi_write_reg_16(dev, this_attr->address, val);
+
+error_ret:
+ return ret ? ret : len;
+}
+
+static int adis16220_capture(struct device *dev)
+{
+ int ret;
+ ret = adis16220_spi_write_reg_16(dev,
+ ADIS16220_GLOB_CMD,
+ 0xBF08); /* initiates a manual data capture */
+ if (ret)
+ dev_err(dev, "problem beginning capture");
+
+ msleep(10); /* delay for capture to finish */
+
+ return ret;
+}
+
+static int adis16220_reset(struct device *dev)
+{
+ int ret;
+ ret = adis16220_spi_write_reg_8(dev,
+ ADIS16220_GLOB_CMD,
+ ADIS16220_GLOB_CMD_SW_RESET);
+ if (ret)
+ dev_err(dev, "problem resetting device");
+
+ return ret;
+}
+
+static ssize_t adis16220_write_reset(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ if (len < 1)
+ return -1;
+ switch (buf[0]) {
+ case '1':
+ case 'y':
+ case 'Y':
+ return adis16220_reset(dev) == 0 ? len : -EIO;
+ }
+ return -1;
+}
+
+static ssize_t adis16220_write_capture(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ if (len < 1)
+ return -1;
+ switch (buf[0]) {
+ case '1':
+ case 'y':
+ case 'Y':
+ return adis16220_capture(dev) == 0 ? len : -EIO;
+ }
+ return -1;
+}
+
+static int adis16220_check_status(struct device *dev)
+{
+ u16 status;
+ int ret;
+
+ ret = adis16220_spi_read_reg_16(dev, ADIS16220_DIAG_STAT, &status);
+
+ if (ret < 0) {
+ dev_err(dev, "Reading status failed\n");
+ goto error_ret;
+ }
+ ret = status & 0x7F;
+
+ if (status & ADIS16220_DIAG_STAT_VIOLATION)
+ dev_err(dev, "Capture period violation/interruption\n");
+ if (status & ADIS16220_DIAG_STAT_SPI_FAIL)
+ dev_err(dev, "SPI failure\n");
+ if (status & ADIS16220_DIAG_STAT_FLASH_UPT)
+ dev_err(dev, "Flash update failed\n");
+ if (status & ADIS16220_DIAG_STAT_POWER_HIGH)
+ dev_err(dev, "Power supply above 5.25V\n");
+ if (status & ADIS16220_DIAG_STAT_POWER_LOW)
+ dev_err(dev, "Power supply below 4.75V\n");
+
+error_ret:
+ return ret;
+}
+
+static int adis16220_self_test(struct device *dev)
+{
+ int ret;
+ ret = adis16220_spi_write_reg_16(dev,
+ ADIS16220_MSC_CTRL,
+ ADIS16220_MSC_CTRL_SELF_TEST_EN);
+ if (ret) {
+ dev_err(dev, "problem starting self test");
+ goto err_ret;
+ }
+
+ adis16220_check_status(dev);
+
+err_ret:
+ return ret;
+}
+
+static int adis16220_initial_setup(struct adis16220_state *st)
+{
+ int ret;
+ struct device *dev = &st->indio_dev->dev;
+
+ /* Do self test */
+ ret = adis16220_self_test(dev);
+ if (ret) {
+ dev_err(dev, "self test failure");
+ goto err_ret;
+ }
+
+ /* Read status register to check the result */
+ ret = adis16220_check_status(dev);
+ if (ret) {
+ adis16220_reset(dev);
+ dev_err(dev, "device not playing ball -> reset");
+ msleep(ADIS16220_STARTUP_DELAY);
+ ret = adis16220_check_status(dev);
+ if (ret) {
+ dev_err(dev, "giving up");
+ goto err_ret;
+ }
+ }
+
+ printk(KERN_INFO DRIVER_NAME ": at CS%d (irq %d)\n",
+ st->us->chip_select, st->us->irq);
+
+err_ret:
+ return ret;
+}
+
+static ssize_t adis16220_capture_buffer_read(struct adis16220_state *st,
+ char *buf,
+ loff_t off,
+ size_t count,
+ int addr)
+{
+ struct spi_message msg;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ .delay_usecs = 25,
+ }, {
+ .tx_buf = st->tx,
+ .rx_buf = st->rx,
+ .bits_per_word = 8,
+ .cs_change = 1,
+ .delay_usecs = 25,
+ },
+ };
+ int ret;
+ int i;
+
+ if (unlikely(!count))
+ return count;
+
+ if ((off >= ADIS16220_CAPTURE_SIZE) || (count & 1) || (off & 1))
+ return -EINVAL;
+
+ if (off + count > ADIS16220_CAPTURE_SIZE)
+ count = ADIS16220_CAPTURE_SIZE - off;
+
+ /* write the begin position of capture buffer */
+ ret = adis16220_spi_write_reg_16(&st->indio_dev->dev,
+ ADIS16220_CAPT_PNTR,
+ off > 1);
+ if (ret)
+ return -EIO;
+
+ /* read count/2 values from capture buffer */
+ mutex_lock(&st->buf_lock);
+
+ for (i = 0; i < count; i += 2) {
+ st->tx[i] = ADIS16220_READ_REG(addr);
+ st->tx[i + 1] = 0;
+ }
+ xfers[1].len = count;
+
+ 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) {
+
+ mutex_unlock(&st->buf_lock);
+ return -EIO;
+ }
+
+ memcpy(buf, st->rx, count);
+
+ mutex_unlock(&st->buf_lock);
+ return count;
+}
+
+static ssize_t adis16220_accel_bin_read(struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf,
+ loff_t off,
+ size_t count)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
+
+ return adis16220_capture_buffer_read(st, buf,
+ off, count,
+ ADIS16220_CAPT_BUFA);
+}
+
+static struct bin_attribute accel_bin = {
+ .attr = {
+ .name = "accel_bin",
+ .mode = S_IRUGO,
+ },
+ .read = adis16220_accel_bin_read,
+ .size = ADIS16220_CAPTURE_SIZE,
+};
+
+static ssize_t adis16220_adc1_bin_read(struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
+
+ return adis16220_capture_buffer_read(st, buf,
+ off, count,
+ ADIS16220_CAPT_BUF1);
+}
+
+static struct bin_attribute adc1_bin = {
+ .attr = {
+ .name = "in0_bin",
+ .mode = S_IRUGO,
+ },
+ .read = adis16220_adc1_bin_read,
+ .size = ADIS16220_CAPTURE_SIZE,
+};
+
+static ssize_t adis16220_adc2_bin_read(struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
+
+ return adis16220_capture_buffer_read(st, buf,
+ off, count,
+ ADIS16220_CAPT_BUF2);
+}
+
+
+static struct bin_attribute adc2_bin = {
+ .attr = {
+ .name = "in1_bin",
+ .mode = S_IRUGO,
+ },
+ .read = adis16220_adc2_bin_read,
+ .size = ADIS16220_CAPTURE_SIZE,
+};
+
+static IIO_DEV_ATTR_IN_NAMED_RAW(supply, adis16220_read_12bit_unsigned,
+ ADIS16220_CAPT_SUPPLY);
+static IIO_CONST_ATTR(in_supply_scale, "0.0012207");
+static IIO_DEV_ATTR_ACCEL(adis16220_read_16bit, ADIS16220_CAPT_BUFA);
+static IIO_DEVICE_ATTR(accel_peak_raw, S_IRUGO, adis16220_read_16bit,
+ NULL, ADIS16220_CAPT_PEAKA);
+static IIO_DEV_ATTR_ACCEL_OFFSET(S_IWUSR | S_IRUGO,
+ adis16220_read_16bit,
+ adis16220_write_16bit,
+ ADIS16220_ACCL_NULL);
+static IIO_DEV_ATTR_TEMP_RAW(adis16220_read_12bit_unsigned);
+static IIO_CONST_ATTR(temp_offset, "25");
+static IIO_CONST_ATTR(temp_scale, "-0.47");
+
+static IIO_DEV_ATTR_IN_RAW(0, adis16220_read_16bit, ADIS16220_CAPT_BUF1);
+static IIO_DEV_ATTR_IN_RAW(1, adis16220_read_16bit, ADIS16220_CAPT_BUF2);
+
+static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL,
+ adis16220_write_reset, 0);
+
+#define IIO_DEV_ATTR_CAPTURE(_store) \
+ IIO_DEVICE_ATTR(capture, S_IWUGO, NULL, _store, 0)
+
+static IIO_DEV_ATTR_CAPTURE(adis16220_write_capture);
+
+#define IIO_DEV_ATTR_CAPTURE_COUNT(_mode, _show, _store, _addr) \
+ IIO_DEVICE_ATTR(capture_count, _mode, _show, _store, _addr)
+
+static IIO_DEV_ATTR_CAPTURE_COUNT(S_IWUSR | S_IRUGO,
+ adis16220_read_16bit,
+ adis16220_write_16bit,
+ ADIS16220_CAPT_PNTR);
+
+static IIO_CONST_ATTR_AVAIL_SAMP_FREQ("100200");
+
+static IIO_CONST_ATTR(name, "adis16220");
+
+static struct attribute *adis16220_attributes[] = {
+ &iio_dev_attr_in_supply_raw.dev_attr.attr,
+ &iio_const_attr_in_supply_scale.dev_attr.attr,
+ &iio_dev_attr_accel_raw.dev_attr.attr,
+ &iio_dev_attr_accel_offset.dev_attr.attr,
+ &iio_dev_attr_accel_peak_raw.dev_attr.attr,
+ &iio_dev_attr_temp_raw.dev_attr.attr,
+ &iio_dev_attr_in0_raw.dev_attr.attr,
+ &iio_dev_attr_in1_raw.dev_attr.attr,
+ &iio_const_attr_temp_offset.dev_attr.attr,
+ &iio_const_attr_temp_scale.dev_attr.attr,
+ &iio_const_attr_available_sampling_frequency.dev_attr.attr,
+ &iio_dev_attr_reset.dev_attr.attr,
+ &iio_dev_attr_capture.dev_attr.attr,
+ &iio_dev_attr_capture_count.dev_attr.attr,
+ &iio_const_attr_name.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group adis16220_attribute_group = {
+ .attrs = adis16220_attributes,
+};
+
+static int __devinit adis16220_probe(struct spi_device *spi)
+{
+ int ret, regdone = 0;
+ struct adis16220_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)*ADIS16220_MAX_RX, GFP_KERNEL);
+ if (st->rx == NULL) {
+ ret = -ENOMEM;
+ goto error_free_st;
+ }
+ st->tx = kzalloc(sizeof(*st->tx)*ADIS16220_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();
+ if (st->indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_free_tx;
+ }
+
+ st->indio_dev->dev.parent = &spi->dev;
+ st->indio_dev->attrs = &adis16220_attribute_group;
+ st->indio_dev->dev_data = (void *)(st);
+ st->indio_dev->driver_module = THIS_MODULE;
+ st->indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = iio_device_register(st->indio_dev);
+ if (ret)
+ goto error_free_dev;
+ regdone = 1;
+
+ ret = sysfs_create_bin_file(&st->indio_dev->dev.kobj, &accel_bin);
+ if (ret)
+ goto error_free_dev;
+
+ ret = sysfs_create_bin_file(&st->indio_dev->dev.kobj, &adc1_bin);
+ if (ret)
+ goto error_rm_accel_bin;
+
+ ret = sysfs_create_bin_file(&st->indio_dev->dev.kobj, &adc2_bin);
+ if (ret)
+ goto error_rm_adc1_bin;
+
+ /* Get the device into a sane initial state */
+ ret = adis16220_initial_setup(st);
+ if (ret)
+ goto error_rm_adc2_bin;
+ return 0;
+
+error_rm_adc2_bin:
+ sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &adc2_bin);
+error_rm_adc1_bin:
+ sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &adc1_bin);
+error_rm_accel_bin:
+ sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &accel_bin);
+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 adis16220_remove(struct spi_device *spi)
+{
+ struct adis16220_state *st = spi_get_drvdata(spi);
+ struct iio_dev *indio_dev = st->indio_dev;
+
+ flush_scheduled_work();
+
+ sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &adc2_bin);
+ sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &adc1_bin);
+ sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &accel_bin);
+ iio_device_unregister(indio_dev);
+ kfree(st->tx);
+ kfree(st->rx);
+ kfree(st);
+
+ return 0;
+}
+
+static struct spi_driver adis16220_driver = {
+ .driver = {
+ .name = "adis16220",
+ .owner = THIS_MODULE,
+ },
+ .probe = adis16220_probe,
+ .remove = __devexit_p(adis16220_remove),
+};
+
+static __init int adis16220_init(void)
+{
+ return spi_register_driver(&adis16220_driver);
+}
+module_init(adis16220_init);
+
+static __exit void adis16220_exit(void)
+{
+ spi_unregister_driver(&adis16220_driver);
+}
+module_exit(adis16220_exit);
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices ADIS16220 Digital Vibration Sensor");
+MODULE_LICENSE("GPL v2");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.