601 lines
16 KiB
C
601 lines
16 KiB
C
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <linux/workqueue.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/sysfs.h>
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#include <linux/list.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "../ring_sw.h"
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#include "accel.h"
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#include "../trigger.h"
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#include "lis3l02dq.h"
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/**
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* combine_8_to_16() utility function to munge to u8s into u16
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**/
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static inline u16 combine_8_to_16(u8 lower, u8 upper)
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{
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u16 _lower = lower;
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u16 _upper = upper;
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return _lower | (_upper << 8);
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}
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/**
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* lis3l02dq_scan_el_set_state() set whether a scan contains a given channel
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* @scan_el: associtate iio scan element attribute
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* @indio_dev: the device structure
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* @bool: desired state
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*
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* mlock already held when this is called.
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**/
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static int lis3l02dq_scan_el_set_state(struct iio_scan_el *scan_el,
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struct iio_dev *indio_dev,
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bool state)
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{
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u8 t, mask;
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int ret;
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ret = lis3l02dq_spi_read_reg_8(&indio_dev->dev,
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LIS3L02DQ_REG_CTRL_1_ADDR,
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&t);
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if (ret)
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goto error_ret;
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switch (scan_el->label) {
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case LIS3L02DQ_REG_OUT_X_L_ADDR:
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mask = LIS3L02DQ_REG_CTRL_1_AXES_X_ENABLE;
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break;
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case LIS3L02DQ_REG_OUT_Y_L_ADDR:
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mask = LIS3L02DQ_REG_CTRL_1_AXES_Y_ENABLE;
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break;
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case LIS3L02DQ_REG_OUT_Z_L_ADDR:
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mask = LIS3L02DQ_REG_CTRL_1_AXES_Z_ENABLE;
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break;
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default:
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ret = -EINVAL;
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goto error_ret;
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}
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if (!(mask & t) == state) {
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if (state)
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t |= mask;
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else
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t &= ~mask;
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ret = lis3l02dq_spi_write_reg_8(&indio_dev->dev,
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LIS3L02DQ_REG_CTRL_1_ADDR,
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&t);
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}
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error_ret:
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return ret;
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}
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static IIO_SCAN_EL_C(accel_x, LIS3L02DQ_SCAN_ACC_X, IIO_SIGNED(16),
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LIS3L02DQ_REG_OUT_X_L_ADDR,
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&lis3l02dq_scan_el_set_state);
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static IIO_SCAN_EL_C(accel_y, LIS3L02DQ_SCAN_ACC_Y, IIO_SIGNED(16),
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LIS3L02DQ_REG_OUT_Y_L_ADDR,
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&lis3l02dq_scan_el_set_state);
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static IIO_SCAN_EL_C(accel_z, LIS3L02DQ_SCAN_ACC_Z, IIO_SIGNED(16),
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LIS3L02DQ_REG_OUT_Z_L_ADDR,
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&lis3l02dq_scan_el_set_state);
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static IIO_SCAN_EL_TIMESTAMP;
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static struct attribute *lis3l02dq_scan_el_attrs[] = {
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&iio_scan_el_accel_x.dev_attr.attr,
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&iio_scan_el_accel_y.dev_attr.attr,
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&iio_scan_el_accel_z.dev_attr.attr,
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&iio_scan_el_timestamp.dev_attr.attr,
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NULL,
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};
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static struct attribute_group lis3l02dq_scan_el_group = {
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.attrs = lis3l02dq_scan_el_attrs,
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.name = "scan_elements",
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};
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/**
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* lis3l02dq_poll_func_th() top half interrupt handler called by trigger
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* @private_data: iio_dev
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**/
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static void lis3l02dq_poll_func_th(struct iio_dev *indio_dev)
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{
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struct lis3l02dq_state *st = iio_dev_get_devdata(indio_dev);
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st->last_timestamp = indio_dev->trig->timestamp;
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schedule_work(&st->work_trigger_to_ring);
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/* Indicate that this interrupt is being handled */
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/* Technically this is trigger related, but without this
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* handler running there is currently now way for the interrupt
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* to clear.
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*/
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st->inter = 1;
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}
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/**
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* lis3l02dq_data_rdy_trig_poll() the event handler for the data rdy trig
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**/
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static int lis3l02dq_data_rdy_trig_poll(struct iio_dev *dev_info,
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int index,
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s64 timestamp,
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int no_test)
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{
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struct lis3l02dq_state *st = iio_dev_get_devdata(dev_info);
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struct iio_trigger *trig = st->trig;
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trig->timestamp = timestamp;
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iio_trigger_poll(trig);
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return IRQ_HANDLED;
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}
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/* This is an event as it is a response to a physical interrupt */
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IIO_EVENT_SH(data_rdy_trig, &lis3l02dq_data_rdy_trig_poll);
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/**
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* lis3l02dq_read_accel_from_ring() individual acceleration read from ring
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**/
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ssize_t lis3l02dq_read_accel_from_ring(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_scan_el *el = NULL;
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int ret, len = 0, i = 0;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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s16 *data;
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while (dev_info->scan_el_attrs->attrs[i]) {
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el = to_iio_scan_el((struct device_attribute *)
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(dev_info->scan_el_attrs->attrs[i]));
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/* label is in fact the address */
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if (el->label == this_attr->address)
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break;
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i++;
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}
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if (!dev_info->scan_el_attrs->attrs[i]) {
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ret = -EINVAL;
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goto error_ret;
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}
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/* If this element is in the scan mask */
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ret = iio_scan_mask_query(dev_info, el->number);
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if (ret < 0)
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goto error_ret;
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if (ret) {
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data = kmalloc(dev_info->ring->access.get_bpd(dev_info->ring),
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GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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ret = dev_info->ring->access.read_last(dev_info->ring,
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(u8 *)data);
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if (ret)
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goto error_free_data;
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} else {
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ret = -EINVAL;
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goto error_ret;
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}
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len = iio_scan_mask_count_to_right(dev_info, el->number);
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if (len < 0) {
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ret = len;
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goto error_free_data;
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}
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len = sprintf(buf, "ring %d\n", data[len]);
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error_free_data:
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kfree(data);
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error_ret:
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return ret ? ret : len;
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}
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static const u8 read_all_tx_array[] =
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{
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LIS3L02DQ_READ_REG(LIS3L02DQ_REG_OUT_X_L_ADDR), 0,
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LIS3L02DQ_READ_REG(LIS3L02DQ_REG_OUT_X_H_ADDR), 0,
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LIS3L02DQ_READ_REG(LIS3L02DQ_REG_OUT_Y_L_ADDR), 0,
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LIS3L02DQ_READ_REG(LIS3L02DQ_REG_OUT_Y_H_ADDR), 0,
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LIS3L02DQ_READ_REG(LIS3L02DQ_REG_OUT_Z_L_ADDR), 0,
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LIS3L02DQ_READ_REG(LIS3L02DQ_REG_OUT_Z_H_ADDR), 0,
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};
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/**
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* lis3l02dq_read_all() Reads all channels currently selected
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* @st: device specific state
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* @rx_array: (dma capable) recieve array, must be at least
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* 4*number of channels
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**/
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int lis3l02dq_read_all(struct lis3l02dq_state *st, u8 *rx_array)
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{
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struct spi_transfer *xfers;
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struct spi_message msg;
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int ret, i, j = 0;
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xfers = kzalloc((st->indio_dev->scan_count) * 2
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* sizeof(*xfers), GFP_KERNEL);
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if (!xfers)
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return -ENOMEM;
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mutex_lock(&st->buf_lock);
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for (i = 0; i < ARRAY_SIZE(read_all_tx_array)/4; i++) {
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if (st->indio_dev->scan_mask & (1 << i)) {
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/* lower byte */
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xfers[j].tx_buf = st->tx + 2*j;
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st->tx[2*j] = read_all_tx_array[i*4];
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st->tx[2*j + 1] = 0;
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if (rx_array)
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xfers[j].rx_buf = rx_array + j*2;
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xfers[j].bits_per_word = 8;
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xfers[j].len = 2;
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xfers[j].cs_change = 1;
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j++;
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/* upper byte */
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xfers[j].tx_buf = st->tx + 2*j;
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st->tx[2*j] = read_all_tx_array[i*4 + 2];
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st->tx[2*j + 1] = 0;
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if (rx_array)
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xfers[j].rx_buf = rx_array + j*2;
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xfers[j].bits_per_word = 8;
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xfers[j].len = 2;
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xfers[j].cs_change = 1;
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j++;
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}
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}
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/* After these are transmitted, the rx_buff should have
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* values in alternate bytes
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*/
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spi_message_init(&msg);
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for (j = 0; j < st->indio_dev->scan_count * 2; j++)
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spi_message_add_tail(&xfers[j], &msg);
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ret = spi_sync(st->us, &msg);
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mutex_unlock(&st->buf_lock);
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kfree(xfers);
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return ret;
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}
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/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
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* specific to be rolled into the core.
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*/
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static void lis3l02dq_trigger_bh_to_ring(struct work_struct *work_s)
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{
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struct lis3l02dq_state *st
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= container_of(work_s, struct lis3l02dq_state,
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work_trigger_to_ring);
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u8 *rx_array;
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int i = 0;
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u16 *data;
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size_t datasize = st->indio_dev
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->ring->access.get_bpd(st->indio_dev->ring);
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data = kmalloc(datasize , GFP_KERNEL);
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if (data == NULL) {
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dev_err(&st->us->dev, "memory alloc failed in ring bh");
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return;
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}
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/* Due to interleaved nature of transmission this buffer must be
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* twice the number of bytes, or 4 times the number of channels
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*/
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rx_array = kmalloc(4 * (st->indio_dev->scan_count), GFP_KERNEL);
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if (rx_array == NULL) {
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dev_err(&st->us->dev, "memory alloc failed in ring bh");
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kfree(data);
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return;
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}
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/* whilst trigger specific, if this read does nto occur the data
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ready interrupt will not be cleared. Need to add a mechanism
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to provide a dummy read function if this is not triggering on
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the data ready function but something else is.
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*/
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st->inter = 0;
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if (st->indio_dev->scan_count)
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if (lis3l02dq_read_all(st, rx_array) >= 0)
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for (; i < st->indio_dev->scan_count; i++)
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data[i] = combine_8_to_16(rx_array[i*4+1],
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rx_array[i*4+3]);
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/* Guaranteed to be aligned with 8 byte boundary */
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if (st->indio_dev->scan_timestamp)
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*((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
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st->indio_dev->ring->access.store_to(st->indio_dev->ring,
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(u8 *)data,
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st->last_timestamp);
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iio_trigger_notify_done(st->indio_dev->trig);
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kfree(rx_array);
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kfree(data);
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return;
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}
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/* in these circumstances is it better to go with unaligned packing and
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* deal with the cost?*/
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static int lis3l02dq_data_rdy_ring_preenable(struct iio_dev *indio_dev)
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{
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size_t size;
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/* Check if there are any scan elements enabled, if not fail*/
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if (!(indio_dev->scan_count || indio_dev->scan_timestamp))
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return -EINVAL;
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if (indio_dev->ring->access.set_bpd) {
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if (indio_dev->scan_timestamp)
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if (indio_dev->scan_count) /* Timestamp and data */
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size = 2*sizeof(s64);
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else /* Timestamp only */
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size = sizeof(s64);
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else /* Data only */
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size = indio_dev->scan_count*sizeof(s16);
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indio_dev->ring->access.set_bpd(indio_dev->ring, size);
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}
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return 0;
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}
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static int lis3l02dq_data_rdy_ring_postenable(struct iio_dev *indio_dev)
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{
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return indio_dev->trig
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? iio_trigger_attach_poll_func(indio_dev->trig,
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indio_dev->pollfunc)
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: 0;
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}
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static int lis3l02dq_data_rdy_ring_predisable(struct iio_dev *indio_dev)
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{
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return indio_dev->trig
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? iio_trigger_dettach_poll_func(indio_dev->trig,
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indio_dev->pollfunc)
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: 0;
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}
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/* Caller responsible for locking as necessary. */
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static int __lis3l02dq_write_data_ready_config(struct device *dev,
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struct
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iio_event_handler_list *list,
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bool state)
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{
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int ret;
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u8 valold;
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bool currentlyset;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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/* Get the current event mask register */
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ret = lis3l02dq_spi_read_reg_8(dev,
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LIS3L02DQ_REG_CTRL_2_ADDR,
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&valold);
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if (ret)
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goto error_ret;
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/* Find out if data ready is already on */
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currentlyset
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= valold & LIS3L02DQ_REG_CTRL_2_ENABLE_DATA_READY_GENERATION;
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/* Disable requested */
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if (!state && currentlyset) {
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valold &= ~LIS3L02DQ_REG_CTRL_2_ENABLE_DATA_READY_GENERATION;
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/* The double write is to overcome a hardware bug?*/
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ret = lis3l02dq_spi_write_reg_8(dev,
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LIS3L02DQ_REG_CTRL_2_ADDR,
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&valold);
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if (ret)
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goto error_ret;
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ret = lis3l02dq_spi_write_reg_8(dev,
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LIS3L02DQ_REG_CTRL_2_ADDR,
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&valold);
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if (ret)
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goto error_ret;
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iio_remove_event_from_list(list,
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&indio_dev->interrupts[0]
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->ev_list);
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/* Enable requested */
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} else if (state && !currentlyset) {
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/* if not set, enable requested */
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valold |= LIS3L02DQ_REG_CTRL_2_ENABLE_DATA_READY_GENERATION;
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iio_add_event_to_list(list, &indio_dev->interrupts[0]->ev_list);
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ret = lis3l02dq_spi_write_reg_8(dev,
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|
LIS3L02DQ_REG_CTRL_2_ADDR,
|
||
|
&valold);
|
||
|
if (ret)
|
||
|
goto error_ret;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
error_ret:
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* lis3l02dq_data_rdy_trigger_set_state() set datardy interrupt state
|
||
|
*
|
||
|
* If disabling the interrupt also does a final read to ensure it is clear.
|
||
|
* This is only important in some cases where the scan enable elements are
|
||
|
* switched before the ring is reenabled.
|
||
|
**/
|
||
|
static int lis3l02dq_data_rdy_trigger_set_state(struct iio_trigger *trig,
|
||
|
bool state)
|
||
|
{
|
||
|
struct lis3l02dq_state *st = trig->private_data;
|
||
|
int ret = 0;
|
||
|
u8 t;
|
||
|
__lis3l02dq_write_data_ready_config(&st->indio_dev->dev,
|
||
|
&iio_event_data_rdy_trig,
|
||
|
state);
|
||
|
if (state == false) {
|
||
|
/* possible quirk with handler currently worked around
|
||
|
by ensuring the work queue is empty */
|
||
|
flush_scheduled_work();
|
||
|
/* Clear any outstanding ready events */
|
||
|
ret = lis3l02dq_read_all(st, NULL);
|
||
|
}
|
||
|
lis3l02dq_spi_read_reg_8(&st->indio_dev->dev,
|
||
|
LIS3L02DQ_REG_WAKE_UP_SRC_ADDR,
|
||
|
&t);
|
||
|
return ret;
|
||
|
}
|
||
|
static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
|
||
|
|
||
|
static struct attribute *lis3l02dq_trigger_attrs[] = {
|
||
|
&dev_attr_name.attr,
|
||
|
NULL,
|
||
|
};
|
||
|
|
||
|
static const struct attribute_group lis3l02dq_trigger_attr_group = {
|
||
|
.attrs = lis3l02dq_trigger_attrs,
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* lis3l02dq_trig_try_reen() try renabling irq for data rdy trigger
|
||
|
* @trig: the datardy trigger
|
||
|
*
|
||
|
* As the trigger may occur on any data element being updated it is
|
||
|
* really rather likely to occur during the read from the previous
|
||
|
* trigger event. The only way to discover if this has occured on
|
||
|
* boards not supporting level interrupts is to take a look at the line.
|
||
|
* If it is indicating another interrupt and we don't seem to have a
|
||
|
* handler looking at it, then we need to notify the core that we need
|
||
|
* to tell the triggering core to try reading all these again.
|
||
|
**/
|
||
|
static int lis3l02dq_trig_try_reen(struct iio_trigger *trig)
|
||
|
{
|
||
|
struct lis3l02dq_state *st = trig->private_data;
|
||
|
enable_irq(st->us->irq);
|
||
|
/* If gpio still high (or high again) */
|
||
|
if (gpio_get_value(irq_to_gpio(st->us->irq)))
|
||
|
if (st->inter == 0) {
|
||
|
/* already interrupt handler dealing with it */
|
||
|
disable_irq_nosync(st->us->irq);
|
||
|
if (st->inter == 1) {
|
||
|
/* interrupt handler snuck in between test
|
||
|
* and disable */
|
||
|
enable_irq(st->us->irq);
|
||
|
return 0;
|
||
|
}
|
||
|
return -EAGAIN;
|
||
|
}
|
||
|
/* irq reenabled so success! */
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int lis3l02dq_probe_trigger(struct iio_dev *indio_dev)
|
||
|
{
|
||
|
int ret;
|
||
|
struct lis3l02dq_state *state = indio_dev->dev_data;
|
||
|
|
||
|
state->trig = iio_allocate_trigger();
|
||
|
state->trig->name = kmalloc(IIO_TRIGGER_NAME_LENGTH, GFP_KERNEL);
|
||
|
if (!state->trig->name) {
|
||
|
ret = -ENOMEM;
|
||
|
goto error_free_trig;
|
||
|
}
|
||
|
snprintf((char *)state->trig->name,
|
||
|
IIO_TRIGGER_NAME_LENGTH,
|
||
|
"lis3l02dq-dev%d", indio_dev->id);
|
||
|
state->trig->dev.parent = &state->us->dev;
|
||
|
state->trig->owner = THIS_MODULE;
|
||
|
state->trig->private_data = state;
|
||
|
state->trig->set_trigger_state = &lis3l02dq_data_rdy_trigger_set_state;
|
||
|
state->trig->try_reenable = &lis3l02dq_trig_try_reen;
|
||
|
state->trig->control_attrs = &lis3l02dq_trigger_attr_group;
|
||
|
ret = iio_trigger_register(state->trig);
|
||
|
if (ret)
|
||
|
goto error_free_trig_name;
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
error_free_trig_name:
|
||
|
kfree(state->trig->name);
|
||
|
error_free_trig:
|
||
|
iio_free_trigger(state->trig);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
void lis3l02dq_remove_trigger(struct iio_dev *indio_dev)
|
||
|
{
|
||
|
struct lis3l02dq_state *state = indio_dev->dev_data;
|
||
|
|
||
|
iio_trigger_unregister(state->trig);
|
||
|
kfree(state->trig->name);
|
||
|
iio_free_trigger(state->trig);
|
||
|
}
|
||
|
|
||
|
void lis3l02dq_unconfigure_ring(struct iio_dev *indio_dev)
|
||
|
{
|
||
|
kfree(indio_dev->pollfunc);
|
||
|
iio_sw_rb_free(indio_dev->ring);
|
||
|
}
|
||
|
|
||
|
int lis3l02dq_configure_ring(struct iio_dev *indio_dev)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
struct lis3l02dq_state *st = indio_dev->dev_data;
|
||
|
struct iio_ring_buffer *ring;
|
||
|
INIT_WORK(&st->work_trigger_to_ring, lis3l02dq_trigger_bh_to_ring);
|
||
|
/* Set default scan mode */
|
||
|
|
||
|
iio_scan_mask_set(indio_dev, iio_scan_el_accel_x.number);
|
||
|
iio_scan_mask_set(indio_dev, iio_scan_el_accel_y.number);
|
||
|
iio_scan_mask_set(indio_dev, iio_scan_el_accel_z.number);
|
||
|
indio_dev->scan_timestamp = true;
|
||
|
|
||
|
indio_dev->scan_el_attrs = &lis3l02dq_scan_el_group;
|
||
|
|
||
|
ring = iio_sw_rb_allocate(indio_dev);
|
||
|
if (!ring) {
|
||
|
ret = -ENOMEM;
|
||
|
return ret;
|
||
|
}
|
||
|
indio_dev->ring = ring;
|
||
|
/* Effectively select the ring buffer implementation */
|
||
|
iio_ring_sw_register_funcs(&ring->access);
|
||
|
ring->preenable = &lis3l02dq_data_rdy_ring_preenable;
|
||
|
ring->postenable = &lis3l02dq_data_rdy_ring_postenable;
|
||
|
ring->predisable = &lis3l02dq_data_rdy_ring_predisable;
|
||
|
ring->owner = THIS_MODULE;
|
||
|
|
||
|
indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
|
||
|
if (indio_dev->pollfunc == NULL) {
|
||
|
ret = -ENOMEM;
|
||
|
goto error_iio_sw_rb_free;;
|
||
|
}
|
||
|
indio_dev->pollfunc->poll_func_main = &lis3l02dq_poll_func_th;
|
||
|
indio_dev->pollfunc->private_data = indio_dev;
|
||
|
indio_dev->modes |= INDIO_RING_TRIGGERED;
|
||
|
return 0;
|
||
|
|
||
|
error_iio_sw_rb_free:
|
||
|
iio_sw_rb_free(indio_dev->ring);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int lis3l02dq_initialize_ring(struct iio_ring_buffer *ring)
|
||
|
{
|
||
|
return iio_ring_buffer_register(ring);
|
||
|
}
|
||
|
|
||
|
void lis3l02dq_uninitialize_ring(struct iio_ring_buffer *ring)
|
||
|
{
|
||
|
iio_ring_buffer_unregister(ring);
|
||
|
}
|
||
|
|
||
|
|
||
|
int lis3l02dq_set_ring_length(struct iio_dev *indio_dev, int length)
|
||
|
{
|
||
|
/* Set sensible defaults for the ring buffer */
|
||
|
if (indio_dev->ring->access.set_length)
|
||
|
return indio_dev->ring->access.set_length(indio_dev->ring, 500);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
|