| /* |
| * ADIS16060 Wide Bandwidth Yaw Rate Gyroscope with SPI 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/slab.h> |
| #include <linux/sysfs.h> |
| #include <linux/list.h> |
| |
| #include "../iio.h" |
| #include "../sysfs.h" |
| #include "gyro.h" |
| #include "../adc/adc.h" |
| |
| #include "adis16060.h" |
| |
| #define DRIVER_NAME "adis16060" |
| |
| struct adis16060_state *adis16060_st; |
| |
| int adis16060_spi_write(struct device *dev, |
| u8 val) |
| { |
| int ret; |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct adis16060_state *st = iio_dev_get_devdata(indio_dev); |
| |
| mutex_lock(&st->buf_lock); |
| st->tx[0] = 0; |
| st->tx[1] = 0; |
| st->tx[2] = val; /* The last 8 bits clocked in are latched */ |
| |
| ret = spi_write(st->us_w, st->tx, 3); |
| mutex_unlock(&st->buf_lock); |
| |
| return ret; |
| } |
| |
| int adis16060_spi_read(struct device *dev, |
| u16 *val) |
| { |
| int ret; |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct adis16060_state *st = iio_dev_get_devdata(indio_dev); |
| |
| mutex_lock(&st->buf_lock); |
| |
| ret = spi_read(st->us_r, st->rx, 3); |
| |
| /* The internal successive approximation ADC begins the conversion process |
| * on the falling edge of MSEL1 and starts to place data MSB first on the |
| * DOUT line at the 6th falling edge of SCLK |
| */ |
| if (ret == 0) |
| *val = ((st->rx[0] & 0x3) << 12) | (st->rx[1] << 4) | ((st->rx[2] >> 4) & 0xF); |
| mutex_unlock(&st->buf_lock); |
| |
| return ret; |
| } |
| |
| static ssize_t adis16060_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| u16 val; |
| ssize_t ret; |
| |
| /* Take the iio_dev status lock */ |
| mutex_lock(&indio_dev->mlock); |
| ret = adis16060_spi_read(dev, &val); |
| mutex_unlock(&indio_dev->mlock); |
| |
| if (ret == 0) |
| return sprintf(buf, "%d\n", val); |
| else |
| return ret; |
| } |
| |
| static ssize_t adis16060_write(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| int ret; |
| long val; |
| |
| ret = strict_strtol(buf, 16, &val); |
| if (ret) |
| goto error_ret; |
| ret = adis16060_spi_write(dev, val); |
| |
| error_ret: |
| return ret ? ret : len; |
| } |
| |
| #define IIO_DEV_ATTR_IN(_show) \ |
| IIO_DEVICE_ATTR(in, S_IRUGO, _show, NULL, 0) |
| |
| #define IIO_DEV_ATTR_OUT(_store) \ |
| IIO_DEVICE_ATTR(out, S_IRUGO, NULL, _store, 0) |
| |
| static IIO_DEV_ATTR_IN(adis16060_read); |
| static IIO_DEV_ATTR_OUT(adis16060_write); |
| |
| static IIO_CONST_ATTR(name, "adis16060"); |
| |
| static struct attribute *adis16060_event_attributes[] = { |
| NULL |
| }; |
| |
| static struct attribute_group adis16060_event_attribute_group = { |
| .attrs = adis16060_event_attributes, |
| }; |
| |
| static struct attribute *adis16060_attributes[] = { |
| &iio_dev_attr_in.dev_attr.attr, |
| &iio_dev_attr_out.dev_attr.attr, |
| &iio_const_attr_name.dev_attr.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group adis16060_attribute_group = { |
| .attrs = adis16060_attributes, |
| }; |
| |
| static int __devinit adis16060_r_probe(struct spi_device *spi) |
| { |
| int ret, regdone = 0; |
| struct adis16060_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)*ADIS16060_MAX_RX, GFP_KERNEL); |
| if (st->rx == NULL) { |
| ret = -ENOMEM; |
| goto error_free_st; |
| } |
| st->tx = kzalloc(sizeof(*st->tx)*ADIS16060_MAX_TX, GFP_KERNEL); |
| if (st->tx == NULL) { |
| ret = -ENOMEM; |
| goto error_free_rx; |
| } |
| st->us_r = 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 = &adis16060_event_attribute_group; |
| st->indio_dev->attrs = &adis16060_attribute_group; |
| st->indio_dev->dev_data = (void *)(st); |
| st->indio_dev->driver_module = THIS_MODULE; |
| st->indio_dev->modes = INDIO_DIRECT_MODE; |
| |
| ret = adis16060_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 = adis16060_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) { |
| ret = iio_register_interrupt_line(spi->irq, |
| st->indio_dev, |
| 0, |
| IRQF_TRIGGER_RISING, |
| "adis16060"); |
| if (ret) |
| goto error_uninitialize_ring; |
| |
| ret = adis16060_probe_trigger(st->indio_dev); |
| if (ret) |
| goto error_unregister_line; |
| } |
| |
| adis16060_st = st; |
| return 0; |
| |
| error_unregister_line: |
| if (st->indio_dev->modes & INDIO_RING_TRIGGERED) |
| iio_unregister_interrupt_line(st->indio_dev, 0); |
| error_uninitialize_ring: |
| adis16060_uninitialize_ring(st->indio_dev->ring); |
| error_unreg_ring_funcs: |
| adis16060_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; |
| } |
| |
| /* fixme, confirm ordering in this function */ |
| static int adis16060_r_remove(struct spi_device *spi) |
| { |
| struct adis16060_state *st = spi_get_drvdata(spi); |
| struct iio_dev *indio_dev = st->indio_dev; |
| |
| flush_scheduled_work(); |
| |
| adis16060_remove_trigger(indio_dev); |
| if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) |
| iio_unregister_interrupt_line(indio_dev, 0); |
| |
| adis16060_uninitialize_ring(indio_dev->ring); |
| adis16060_unconfigure_ring(indio_dev); |
| iio_device_unregister(indio_dev); |
| kfree(st->tx); |
| kfree(st->rx); |
| kfree(st); |
| |
| return 0; |
| } |
| |
| static int __devinit adis16060_w_probe(struct spi_device *spi) |
| { |
| int ret; |
| struct adis16060_state *st = adis16060_st; |
| if (!st) { |
| ret = -ENODEV; |
| goto error_ret; |
| } |
| spi_set_drvdata(spi, st); |
| st->us_w = spi; |
| return 0; |
| |
| error_ret: |
| return ret; |
| } |
| |
| static int adis16060_w_remove(struct spi_device *spi) |
| { |
| return 0; |
| } |
| |
| static struct spi_driver adis16060_r_driver = { |
| .driver = { |
| .name = "adis16060_r", |
| .owner = THIS_MODULE, |
| }, |
| .probe = adis16060_r_probe, |
| .remove = __devexit_p(adis16060_r_remove), |
| }; |
| |
| static struct spi_driver adis16060_w_driver = { |
| .driver = { |
| .name = "adis16060_w", |
| .owner = THIS_MODULE, |
| }, |
| .probe = adis16060_w_probe, |
| .remove = __devexit_p(adis16060_w_remove), |
| }; |
| |
| static __init int adis16060_init(void) |
| { |
| int ret; |
| |
| ret = spi_register_driver(&adis16060_r_driver); |
| if (ret < 0) |
| return ret; |
| |
| ret = spi_register_driver(&adis16060_w_driver); |
| if (ret < 0) { |
| spi_unregister_driver(&adis16060_r_driver); |
| return ret; |
| } |
| |
| return 0; |
| } |
| module_init(adis16060_init); |
| |
| static __exit void adis16060_exit(void) |
| { |
| spi_unregister_driver(&adis16060_w_driver); |
| spi_unregister_driver(&adis16060_r_driver); |
| } |
| module_exit(adis16060_exit); |
| |
| MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| MODULE_DESCRIPTION("Analog Devices ADIS16060 Yaw Rate Gyroscope with SPI driver"); |
| MODULE_LICENSE("GPL v2"); |