From 66533b488e17df35f5cd3bc2ebdafdf1444eb187 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Tue, 18 Aug 2009 18:06:22 +0100 Subject: Staging: IIO: lis3l02dq accelerometer core support A later patch in the series will add data ready triggering and ring buffer support. This core patch provides an event interface and sysfs based reading of values. Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/accel/lis3l02dq_core.c | 926 +++++++++++++++++++++++++++++ 1 file changed, 926 insertions(+) create mode 100644 drivers/staging/iio/accel/lis3l02dq_core.c (limited to 'drivers/staging/iio/accel/lis3l02dq_core.c') diff --git a/drivers/staging/iio/accel/lis3l02dq_core.c b/drivers/staging/iio/accel/lis3l02dq_core.c new file mode 100644 index 00000000000..f008837e5a1 --- /dev/null +++ b/drivers/staging/iio/accel/lis3l02dq_core.c @@ -0,0 +1,926 @@ +/* + * lis3l02dq.c support STMicroelectronics LISD02DQ + * 3d 2g Linear Accelerometers via SPI + * + * Copyright (c) 2007 Jonathan Cameron + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Settings: + * 16 bit left justified mode used. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "../iio.h" +#include "../sysfs.h" +#include "accel.h" + +#include "lis3l02dq.h" + +/* At the moment the spi framework doesn't allow global setting of cs_change. + * It's in the likely to be added comment at the top of spi.h. + * This means that use cannot be made of spi_write etc. + */ + +/** + * lis3l02dq_spi_read_reg_8() - read single byte from a single register + * @dev: device asosciated with child of actual device (iio_dev or iio_trig) + * @reg_address: the address of the register to be read + * @val: pass back the resulting value + **/ +int lis3l02dq_spi_read_reg_8(struct device *dev, u8 reg_address, u8 *val) +{ + int ret; + struct spi_message msg; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct lis3l02dq_state *st = iio_dev_get_devdata(indio_dev); + struct spi_transfer xfer = { + .tx_buf = st->tx, + .rx_buf = st->rx, + .bits_per_word = 8, + .len = 2, + .cs_change = 1, + }; + + mutex_lock(&st->buf_lock); + st->tx[0] = LIS3L02DQ_READ_REG(reg_address); + st->tx[1] = 0; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->us, &msg); + *val = st->rx[1]; + mutex_unlock(&st->buf_lock); + + return ret; +} + +/** + * lis3l02dq_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 writen + * @val: the value to write + **/ +int lis3l02dq_spi_write_reg_8(struct device *dev, + u8 reg_address, + u8 *val) +{ + int ret; + struct spi_message msg; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct lis3l02dq_state *st = iio_dev_get_devdata(indio_dev); + struct spi_transfer xfer = { + .tx_buf = st->tx, + .bits_per_word = 8, + .len = 2, + .cs_change = 1, + }; + + mutex_lock(&st->buf_lock); + st->tx[0] = LIS3L02DQ_WRITE_REG(reg_address); + st->tx[1] = *val; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + ret = spi_sync(st->us, &msg); + mutex_unlock(&st->buf_lock); + + return ret; +} + +/** + * lisl302dq_spi_write_reg_s16() - 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 lis3l02dq_spi_write_reg_s16(struct device *dev, + u8 lower_reg_address, + s16 value) +{ + int ret; + struct spi_message msg; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct lis3l02dq_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] = LIS3L02DQ_WRITE_REG(lower_reg_address); + st->tx[1] = value & 0xFF; + st->tx[2] = LIS3L02DQ_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; +} + +/** + * lisl302dq_spi_read_reg_s16() - 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: somewhere to pass back the value read + **/ +static int lis3l02dq_spi_read_reg_s16(struct device *dev, + u8 lower_reg_address, + s16 *val) +{ + struct spi_message msg; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct lis3l02dq_state *st = iio_dev_get_devdata(indio_dev); + int ret; + struct spi_transfer xfers[] = { { + .tx_buf = st->tx, + .rx_buf = st->rx, + .bits_per_word = 8, + .len = 2, + .cs_change = 1, + }, { + .tx_buf = st->tx + 2, + .rx_buf = st->rx + 2, + .bits_per_word = 8, + .len = 2, + .cs_change = 1, + + }, + }; + + mutex_lock(&st->buf_lock); + st->tx[0] = LIS3L02DQ_READ_REG(lower_reg_address); + st->tx[1] = 0; + st->tx[2] = LIS3L02DQ_READ_REG(lower_reg_address+1); + st->tx[3] = 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"); + goto error_ret; + } + *val = (s16)(st->rx[1]) | ((s16)(st->rx[3]) << 8); + +error_ret: + mutex_unlock(&st->buf_lock); + return ret; +} + +/** + * lis3l02dq_read_signed() - attribute function used for 8 bit signed values + * @dev: the child device associated with the iio_dev or iio_trigger + * @attr: the attribute being processed + * @buf: buffer into which put the output string + **/ +static ssize_t lis3l02dq_read_signed(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + s8 val; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = lis3l02dq_spi_read_reg_8(dev, this_attr->address, (u8 *)&val); + + return ret ? ret : sprintf(buf, "%d\n", val); +} + +static ssize_t lis3l02dq_read_unsigned(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + u8 val; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = lis3l02dq_spi_read_reg_8(dev, this_attr->address, &val); + + return ret ? ret : sprintf(buf, "%d\n", val); +} + +static ssize_t lis3l02dq_write_signed(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + long valin; + s8 val; + int ret; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = strict_strtol(buf, 10, &valin); + if (ret) + goto error_ret; + val = valin; + ret = lis3l02dq_spi_write_reg_8(dev, this_attr->address, (u8 *)&val); + +error_ret: + return ret ? ret : len; +} + +static ssize_t lis3l02dq_write_unsigned(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + int ret; + ulong valin; + u8 val; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = strict_strtoul(buf, 10, &valin); + if (ret) + goto err_ret; + val = valin; + ret = lis3l02dq_spi_write_reg_8(dev, this_attr->address, &val); + +err_ret: + return ret ? ret : len; +} + +static ssize_t lis3l02dq_read_16bit_signed(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + s16 val = 0; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = lis3l02dq_spi_read_reg_s16(dev, this_attr->address, &val); + + if (ret) + return ret; + + return sprintf(buf, "%d\n", val); +} + +static ssize_t lis3l02dq_read_accel(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); + if (indio_dev->currentmode == INDIO_RING_TRIGGERED) + ret = lis3l02dq_read_accel_from_ring(dev, attr, buf); + else + ret = lis3l02dq_read_16bit_signed(dev, attr, buf); + mutex_unlock(&indio_dev->mlock); + + return ret; +} + +static ssize_t lis3l02dq_write_16bit_signed(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 = lis3l02dq_spi_write_reg_s16(dev, this_attr->address, val); + +error_ret: + return ret ? ret : len; +} + +static ssize_t lis3l02dq_read_frequency(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret, len = 0; + s8 t; + ret = lis3l02dq_spi_read_reg_8(dev, + LIS3L02DQ_REG_CTRL_1_ADDR, + (u8 *)&t); + if (ret) + return ret; + t &= LIS3L02DQ_DEC_MASK; + switch (t) { + case LIS3L02DQ_REG_CTRL_1_DF_128: + len = sprintf(buf, "280\n"); + break; + case LIS3L02DQ_REG_CTRL_1_DF_64: + len = sprintf(buf, "560\n"); + break; + case LIS3L02DQ_REG_CTRL_1_DF_32: + len = sprintf(buf, "1120\n"); + break; + case LIS3L02DQ_REG_CTRL_1_DF_8: + len = sprintf(buf, "4480\n"); + break; + } + return len; +} + +static ssize_t lis3l02dq_write_frequency(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + long val; + int ret; + u8 t; + + ret = strict_strtol(buf, 10, &val); + if (ret) + return ret; + + mutex_lock(&indio_dev->mlock); + ret = lis3l02dq_spi_read_reg_8(dev, + LIS3L02DQ_REG_CTRL_1_ADDR, + &t); + if (ret) + goto error_ret_mutex; + /* Wipe the bits clean */ + t &= ~LIS3L02DQ_DEC_MASK; + switch (val) { + case 280: + t |= LIS3L02DQ_REG_CTRL_1_DF_128; + break; + case 560: + t |= LIS3L02DQ_REG_CTRL_1_DF_64; + break; + case 1120: + t |= LIS3L02DQ_REG_CTRL_1_DF_32; + break; + case 4480: + t |= LIS3L02DQ_REG_CTRL_1_DF_8; + break; + default: + ret = -EINVAL; + goto error_ret_mutex; + }; + + ret = lis3l02dq_spi_write_reg_8(dev, + LIS3L02DQ_REG_CTRL_1_ADDR, + &t); + +error_ret_mutex: + mutex_unlock(&indio_dev->mlock); + + return ret ? ret : len; +} + +static int lis3l02dq_initial_setup(struct lis3l02dq_state *st) +{ + int ret; + u8 val, valtest; + + st->us->mode = SPI_MODE_3; + + spi_setup(st->us); + + val = LIS3L02DQ_DEFAULT_CTRL1; + /* Write suitable defaults to ctrl1 */ + ret = lis3l02dq_spi_write_reg_8(&st->indio_dev->dev, + LIS3L02DQ_REG_CTRL_1_ADDR, + &val); + if (ret) { + dev_err(&st->us->dev, "problem with setup control register 1"); + goto err_ret; + } + /* Repeat as sometimes doesn't work first time?*/ + ret = lis3l02dq_spi_write_reg_8(&st->indio_dev->dev, + LIS3L02DQ_REG_CTRL_1_ADDR, + &val); + if (ret) { + dev_err(&st->us->dev, "problem with setup control register 1"); + goto err_ret; + } + + /* Read back to check this has worked acts as loose test of correct + * chip */ + ret = lis3l02dq_spi_read_reg_8(&st->indio_dev->dev, + LIS3L02DQ_REG_CTRL_1_ADDR, + &valtest); + if (ret || (valtest != val)) { + dev_err(&st->indio_dev->dev, "device not playing ball"); + ret = -EINVAL; + goto err_ret; + } + + val = LIS3L02DQ_DEFAULT_CTRL2; + ret = lis3l02dq_spi_write_reg_8(&st->indio_dev->dev, + LIS3L02DQ_REG_CTRL_2_ADDR, + &val); + if (ret) { + dev_err(&st->us->dev, "problem with setup control register 2"); + goto err_ret; + } + + val = LIS3L02DQ_REG_WAKE_UP_CFG_LATCH_SRC; + ret = lis3l02dq_spi_write_reg_8(&st->indio_dev->dev, + LIS3L02DQ_REG_WAKE_UP_CFG_ADDR, + &val); + if (ret) + dev_err(&st->us->dev, "problem with interrupt cfg register"); +err_ret: + + return ret; +} + +static IIO_DEV_ATTR_ACCEL_X_OFFSET(S_IWUSR | S_IRUGO, + lis3l02dq_read_signed, + lis3l02dq_write_signed, + LIS3L02DQ_REG_OFFSET_X_ADDR); + +static IIO_DEV_ATTR_ACCEL_Y_OFFSET(S_IWUSR | S_IRUGO, + lis3l02dq_read_signed, + lis3l02dq_write_signed, + LIS3L02DQ_REG_OFFSET_Y_ADDR); + +static IIO_DEV_ATTR_ACCEL_Z_OFFSET(S_IWUSR | S_IRUGO, + lis3l02dq_read_signed, + lis3l02dq_write_signed, + LIS3L02DQ_REG_OFFSET_Z_ADDR); + +static IIO_DEV_ATTR_ACCEL_X_GAIN(S_IWUSR | S_IRUGO, + lis3l02dq_read_unsigned, + lis3l02dq_write_unsigned, + LIS3L02DQ_REG_GAIN_X_ADDR); + +static IIO_DEV_ATTR_ACCEL_Y_GAIN(S_IWUSR | S_IRUGO, + lis3l02dq_read_unsigned, + lis3l02dq_write_unsigned, + LIS3L02DQ_REG_GAIN_Y_ADDR); + +static IIO_DEV_ATTR_ACCEL_Z_GAIN(S_IWUSR | S_IRUGO, + lis3l02dq_read_unsigned, + lis3l02dq_write_unsigned, + LIS3L02DQ_REG_GAIN_Z_ADDR); + +static IIO_DEV_ATTR_ACCEL_THRESH(S_IWUSR | S_IRUGO, + lis3l02dq_read_16bit_signed, + lis3l02dq_write_16bit_signed, + LIS3L02DQ_REG_THS_L_ADDR); + +/* RFC The reading method for these will change depending on whether + * ring buffer capture is in use. Is it worth making these take two + * functions and let the core handle which to call, or leave as in this + * driver where it is the drivers problem to manage this? + */ + +static IIO_DEV_ATTR_ACCEL_X(lis3l02dq_read_accel, + LIS3L02DQ_REG_OUT_X_L_ADDR); + +static IIO_DEV_ATTR_ACCEL_Y(lis3l02dq_read_accel, + LIS3L02DQ_REG_OUT_Y_L_ADDR); + +static IIO_DEV_ATTR_ACCEL_Z(lis3l02dq_read_accel, + LIS3L02DQ_REG_OUT_Z_L_ADDR); + +static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, + lis3l02dq_read_frequency, + lis3l02dq_write_frequency); + +static IIO_CONST_ATTR_AVAIL_SAMP_FREQ("280 560 1120 4480"); + +static ssize_t lis3l02dq_read_interrupt_config(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + s8 val; + struct iio_event_attr *this_attr = to_iio_event_attr(attr); + + ret = lis3l02dq_spi_read_reg_8(dev, + LIS3L02DQ_REG_WAKE_UP_CFG_ADDR, + (u8 *)&val); + + return ret ? ret : sprintf(buf, "%d\n", + (val & this_attr->mask) ? 1 : 0);; +} + +static ssize_t lis3l02dq_write_interrupt_config(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_event_attr *this_attr = to_iio_event_attr(attr); + struct iio_dev *indio_dev = dev_get_drvdata(dev); + int ret, currentlyset, changed = 0; + u8 valold, controlold; + bool val; + + val = !(buf[0] == '0'); + + mutex_lock(&indio_dev->mlock); + /* read current value */ + ret = lis3l02dq_spi_read_reg_8(dev, + LIS3L02DQ_REG_WAKE_UP_CFG_ADDR, + &valold); + if (ret) + goto error_mutex_unlock; + + /* read current control */ + ret = lis3l02dq_spi_read_reg_8(dev, + LIS3L02DQ_REG_CTRL_2_ADDR, + &controlold); + if (ret) + goto error_mutex_unlock; + currentlyset = !!(valold & this_attr->mask); + if (val == false && currentlyset) { + valold &= ~this_attr->mask; + changed = 1; + iio_remove_event_from_list(this_attr->listel, + &indio_dev->interrupts[0] + ->ev_list); + } else if (val == true && !currentlyset) { + changed = 1; + valold |= this_attr->mask; + iio_add_event_to_list(this_attr->listel, + &indio_dev->interrupts[0]->ev_list); + } + + if (changed) { + ret = lis3l02dq_spi_write_reg_8(dev, + LIS3L02DQ_REG_WAKE_UP_CFG_ADDR, + &valold); + if (ret) + goto error_mutex_unlock; + /* This always enables the interrupt, even if we've remove the + * last thing using it. For this device we can use the reference + * count on the handler to tell us if anyone wants the interrupt + */ + controlold = this_attr->listel->refcount ? + (controlold | LIS3L02DQ_REG_CTRL_2_ENABLE_INTERRUPT) : + (controlold & ~LIS3L02DQ_REG_CTRL_2_ENABLE_INTERRUPT); + ret = lis3l02dq_spi_write_reg_8(dev, + LIS3L02DQ_REG_CTRL_2_ADDR, + &controlold); + if (ret) + goto error_mutex_unlock; + } +error_mutex_unlock: + mutex_unlock(&indio_dev->mlock); + + return ret ? ret : len; +} + + +static int lis3l02dq_thresh_handler_th(struct iio_dev *dev_info, + int index, + s64 timestamp, + int no_test) +{ + struct lis3l02dq_state *st = dev_info->dev_data; + + /* Stash the timestamp somewhere convenient for the bh */ + st->last_timestamp = timestamp; + schedule_work(&st->work_cont_thresh.ws); + + return 0; +} + + +/* Unforunately it appears the interrupt won't clear unless you read from the + * src register. + */ +static void lis3l02dq_thresh_handler_bh_no_check(struct work_struct *work_s) +{ + struct iio_work_cont *wc + = container_of(work_s, struct iio_work_cont, ws_nocheck); + struct lis3l02dq_state *st = wc->st; + u8 t; + + lis3l02dq_spi_read_reg_8(&st->indio_dev->dev, + LIS3L02DQ_REG_WAKE_UP_SRC_ADDR, + &t); + + if (t & LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Z_HIGH) + iio_push_event(st->indio_dev, 0, + IIO_EVENT_CODE_ACCEL_Z_HIGH, + st->last_timestamp); + + if (t & LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Z_LOW) + iio_push_event(st->indio_dev, 0, + IIO_EVENT_CODE_ACCEL_Z_LOW, + st->last_timestamp); + + if (t & LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Y_HIGH) + iio_push_event(st->indio_dev, 0, + IIO_EVENT_CODE_ACCEL_Y_HIGH, + st->last_timestamp); + + if (t & LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Y_LOW) + iio_push_event(st->indio_dev, 0, + IIO_EVENT_CODE_ACCEL_Y_LOW, + st->last_timestamp); + + if (t & LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_X_HIGH) + iio_push_event(st->indio_dev, 0, + IIO_EVENT_CODE_ACCEL_X_HIGH, + st->last_timestamp); + + if (t & LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_X_LOW) + iio_push_event(st->indio_dev, 0, + IIO_EVENT_CODE_ACCEL_X_LOW, + st->last_timestamp); + /* reenable the irq */ + enable_irq(st->us->irq); + /* Ack and allow for new interrupts */ + lis3l02dq_spi_read_reg_8(&st->indio_dev->dev, + LIS3L02DQ_REG_WAKE_UP_ACK_ADDR, + &t); + + return; +} + +/* A shared handler for a number of threshold types */ +IIO_EVENT_SH(threshold, &lis3l02dq_thresh_handler_th); + +IIO_EVENT_ATTR_ACCEL_X_HIGH_SH(iio_event_threshold, + lis3l02dq_read_interrupt_config, + lis3l02dq_write_interrupt_config, + LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_X_HIGH); + +IIO_EVENT_ATTR_ACCEL_Y_HIGH_SH(iio_event_threshold, + lis3l02dq_read_interrupt_config, + lis3l02dq_write_interrupt_config, + LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Y_HIGH); + +IIO_EVENT_ATTR_ACCEL_Z_HIGH_SH(iio_event_threshold, + lis3l02dq_read_interrupt_config, + lis3l02dq_write_interrupt_config, + LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Z_HIGH); + +IIO_EVENT_ATTR_ACCEL_X_LOW_SH(iio_event_threshold, + lis3l02dq_read_interrupt_config, + lis3l02dq_write_interrupt_config, + LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_X_LOW); + +IIO_EVENT_ATTR_ACCEL_Y_LOW_SH(iio_event_threshold, + lis3l02dq_read_interrupt_config, + lis3l02dq_write_interrupt_config, + LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Y_LOW); + +IIO_EVENT_ATTR_ACCEL_Z_LOW_SH(iio_event_threshold, + lis3l02dq_read_interrupt_config, + lis3l02dq_write_interrupt_config, + LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Z_LOW); + +static struct attribute *lis3l02dq_event_attributes[] = { + &iio_event_attr_accel_x_high.dev_attr.attr, + &iio_event_attr_accel_y_high.dev_attr.attr, + &iio_event_attr_accel_z_high.dev_attr.attr, + &iio_event_attr_accel_x_low.dev_attr.attr, + &iio_event_attr_accel_y_low.dev_attr.attr, + &iio_event_attr_accel_z_low.dev_attr.attr, + NULL +}; + +static struct attribute_group lis3l02dq_event_attribute_group = { + .attrs = lis3l02dq_event_attributes, +}; + +static IIO_CONST_ATTR(name, "lis3l02dq"); + +static struct attribute *lis3l02dq_attributes[] = { + &iio_dev_attr_accel_x_offset.dev_attr.attr, + &iio_dev_attr_accel_y_offset.dev_attr.attr, + &iio_dev_attr_accel_z_offset.dev_attr.attr, + &iio_dev_attr_accel_x_gain.dev_attr.attr, + &iio_dev_attr_accel_y_gain.dev_attr.attr, + &iio_dev_attr_accel_z_gain.dev_attr.attr, + &iio_dev_attr_thresh.dev_attr.attr, + &iio_dev_attr_accel_x.dev_attr.attr, + &iio_dev_attr_accel_y.dev_attr.attr, + &iio_dev_attr_accel_z.dev_attr.attr, + &iio_dev_attr_sampling_frequency.dev_attr.attr, + &iio_const_attr_available_sampling_frequency.dev_attr.attr, + &iio_const_attr_name.dev_attr.attr, + NULL +}; + +static const struct attribute_group lis3l02dq_attribute_group = { + .attrs = lis3l02dq_attributes, +}; + +static int __devinit lis3l02dq_probe(struct spi_device *spi) +{ + int ret, regdone = 0; + struct lis3l02dq_state *st = kzalloc(sizeof *st, GFP_KERNEL); + if (!st) { + ret = -ENOMEM; + goto error_ret; + } + /* this is only used tor removal purposes */ + spi_set_drvdata(spi, st); + + /* Allocate the comms buffers */ + st->rx = kzalloc(sizeof(*st->rx)*LIS3L02DQ_MAX_RX, GFP_KERNEL); + if (st->rx == NULL) { + ret = -ENOMEM; + goto error_free_st; + } + st->tx = kzalloc(sizeof(*st->tx)*LIS3L02DQ_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->num_interrupt_lines = 1; + st->indio_dev->event_attrs = &lis3l02dq_event_attribute_group; + st->indio_dev->attrs = &lis3l02dq_attribute_group; + st->indio_dev->dev_data = (void *)(st); + st->indio_dev->driver_module = THIS_MODULE; + st->indio_dev->modes = INDIO_DIRECT_MODE; + + ret = lis3l02dq_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 = lis3l02dq_initialize_ring(st->indio_dev->ring); + if (ret) { + printk(KERN_ERR "failed to initialize the ring\n"); + goto error_unreg_ring_funcs; + } + + if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) { + /* This is a little unusual, in that the device seems + to need a full read of the interrupt source reg before + the interrupt will reset. + Hence the two handlers are the same */ + iio_init_work_cont(&st->work_cont_thresh, + lis3l02dq_thresh_handler_bh_no_check, + lis3l02dq_thresh_handler_bh_no_check, + LIS3L02DQ_REG_WAKE_UP_SRC_ADDR, + 0, + st); + st->inter = 0; + ret = iio_register_interrupt_line(spi->irq, + st->indio_dev, + 0, + IRQF_TRIGGER_RISING, + "lis3l02dq"); + if (ret) + goto error_uninitialize_ring; + + ret = lis3l02dq_probe_trigger(st->indio_dev); + if (ret) + goto error_unregister_line; + } + + /* Get the device into a sane initial state */ + ret = lis3l02dq_initial_setup(st); + if (ret) + goto error_remove_trigger; + return 0; + +error_remove_trigger: + if (st->indio_dev->modes & INDIO_RING_TRIGGERED) + lis3l02dq_remove_trigger(st->indio_dev); +error_unregister_line: + if (st->indio_dev->modes & INDIO_RING_TRIGGERED) + iio_unregister_interrupt_line(st->indio_dev, 0); +error_uninitialize_ring: + lis3l02dq_uninitialize_ring(st->indio_dev->ring); +error_unreg_ring_funcs: + lis3l02dq_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; +} + +/* Power down the device */ +static int lis3l02dq_stop_device(struct iio_dev *indio_dev) +{ + int ret; + struct lis3l02dq_state *st = indio_dev->dev_data; + u8 val = 0; + + mutex_lock(&indio_dev->mlock); + ret = lis3l02dq_spi_write_reg_8(&indio_dev->dev, + LIS3L02DQ_REG_CTRL_1_ADDR, + &val); + if (ret) { + dev_err(&st->us->dev, "problem with turning device off: ctrl1"); + goto err_ret; + } + + ret = lis3l02dq_spi_write_reg_8(&indio_dev->dev, + LIS3L02DQ_REG_CTRL_2_ADDR, + &val); + if (ret) + dev_err(&st->us->dev, "problem with turning device off: ctrl2"); +err_ret: + mutex_unlock(&indio_dev->mlock); + return ret; +} + +/* fixme, confirm ordering in this function */ +static int lis3l02dq_remove(struct spi_device *spi) +{ + int ret; + struct lis3l02dq_state *st = spi_get_drvdata(spi); + struct iio_dev *indio_dev = st->indio_dev; + + ret = lis3l02dq_stop_device(indio_dev); + if (ret) + goto err_ret; + + flush_scheduled_work(); + + lis3l02dq_remove_trigger(indio_dev); + if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) + iio_unregister_interrupt_line(indio_dev, 0); + + lis3l02dq_uninitialize_ring(indio_dev->ring); + lis3l02dq_unconfigure_ring(indio_dev); + iio_device_unregister(indio_dev); + kfree(st->tx); + kfree(st->rx); + kfree(st); + + return 0; + +err_ret: + return ret; +} + +static struct spi_driver lis3l02dq_driver = { + .driver = { + .name = "lis3l02dq", + .owner = THIS_MODULE, + }, + .probe = lis3l02dq_probe, + .remove = __devexit_p(lis3l02dq_remove), +}; + +static __init int lis3l02dq_init(void) +{ + return spi_register_driver(&lis3l02dq_driver); +} +module_init(lis3l02dq_init); + +static __exit void lis3l02dq_exit(void) +{ + spi_unregister_driver(&lis3l02dq_driver); +} +module_exit(lis3l02dq_exit); + +MODULE_AUTHOR("Jonathan Cameron "); +MODULE_DESCRIPTION("ST LIS3L02DQ Accelerometer SPI driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3