Manuel Stahl | 9dbf091 | 2013-02-01 08:51:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * itg3200_buffer.c -- support InvenSense ITG3200 |
| 3 | * Digital 3-Axis Gyroscope driver |
| 4 | * |
| 5 | * Copyright (c) 2011 Christian Strobel <christian.strobel@iis.fraunhofer.de> |
| 6 | * Copyright (c) 2011 Manuel Stahl <manuel.stahl@iis.fraunhofer.de> |
| 7 | * Copyright (c) 2012 Thorsten Nowak <thorsten.nowak@iis.fraunhofer.de> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/i2c.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | |
| 18 | #include <linux/iio/iio.h> |
| 19 | #include <linux/iio/buffer.h> |
| 20 | #include <linux/iio/trigger.h> |
| 21 | #include <linux/iio/trigger_consumer.h> |
| 22 | #include <linux/iio/triggered_buffer.h> |
| 23 | #include <linux/iio/gyro/itg3200.h> |
| 24 | |
| 25 | |
| 26 | static int itg3200_read_all_channels(struct i2c_client *i2c, __be16 *buf) |
| 27 | { |
| 28 | u8 tx = 0x80 | ITG3200_REG_TEMP_OUT_H; |
| 29 | struct i2c_msg msg[2] = { |
| 30 | { |
| 31 | .addr = i2c->addr, |
| 32 | .flags = i2c->flags, |
| 33 | .len = 1, |
| 34 | .buf = &tx, |
| 35 | }, |
| 36 | { |
| 37 | .addr = i2c->addr, |
| 38 | .flags = i2c->flags | I2C_M_RD, |
| 39 | .len = ITG3200_SCAN_ELEMENTS * sizeof(s16), |
| 40 | .buf = (char *)&buf, |
| 41 | }, |
| 42 | }; |
| 43 | |
| 44 | return i2c_transfer(i2c->adapter, msg, 2); |
| 45 | } |
| 46 | |
| 47 | static irqreturn_t itg3200_trigger_handler(int irq, void *p) |
| 48 | { |
| 49 | struct iio_poll_func *pf = p; |
| 50 | struct iio_dev *indio_dev = pf->indio_dev; |
| 51 | struct itg3200 *st = iio_priv(indio_dev); |
| 52 | __be16 buf[ITG3200_SCAN_ELEMENTS + sizeof(s64)/sizeof(u16)]; |
| 53 | |
| 54 | int ret = itg3200_read_all_channels(st->i2c, buf); |
| 55 | if (ret < 0) |
| 56 | goto error_ret; |
| 57 | |
Lars-Peter Clausen | 36e0371e | 2013-09-19 13:59:00 +0100 | [diff] [blame] | 58 | iio_push_to_buffers_with_timestamp(indio_dev, buf, pf->timestamp); |
Manuel Stahl | 9dbf091 | 2013-02-01 08:51:00 +0000 | [diff] [blame] | 59 | |
Manuel Stahl | 9dbf091 | 2013-02-01 08:51:00 +0000 | [diff] [blame] | 60 | iio_trigger_notify_done(indio_dev->trig); |
| 61 | |
| 62 | error_ret: |
| 63 | return IRQ_HANDLED; |
| 64 | } |
| 65 | |
| 66 | int itg3200_buffer_configure(struct iio_dev *indio_dev) |
| 67 | { |
| 68 | return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, |
| 69 | itg3200_trigger_handler, NULL); |
| 70 | } |
| 71 | |
| 72 | void itg3200_buffer_unconfigure(struct iio_dev *indio_dev) |
| 73 | { |
| 74 | iio_triggered_buffer_cleanup(indio_dev); |
| 75 | } |
| 76 | |
| 77 | |
| 78 | static int itg3200_data_rdy_trigger_set_state(struct iio_trigger *trig, |
| 79 | bool state) |
| 80 | { |
Lars-Peter Clausen | 1e9663c | 2013-03-25 08:58:00 +0000 | [diff] [blame] | 81 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
Manuel Stahl | 9dbf091 | 2013-02-01 08:51:00 +0000 | [diff] [blame] | 82 | int ret; |
| 83 | u8 msc; |
| 84 | |
| 85 | ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, &msc); |
| 86 | if (ret) |
| 87 | goto error_ret; |
| 88 | |
| 89 | if (state) |
| 90 | msc |= ITG3200_IRQ_DATA_RDY_ENABLE; |
| 91 | else |
| 92 | msc &= ~ITG3200_IRQ_DATA_RDY_ENABLE; |
| 93 | |
| 94 | ret = itg3200_write_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, msc); |
| 95 | if (ret) |
| 96 | goto error_ret; |
| 97 | |
| 98 | error_ret: |
| 99 | return ret; |
| 100 | |
| 101 | } |
| 102 | |
| 103 | static const struct iio_trigger_ops itg3200_trigger_ops = { |
| 104 | .owner = THIS_MODULE, |
| 105 | .set_trigger_state = &itg3200_data_rdy_trigger_set_state, |
| 106 | }; |
| 107 | |
| 108 | int itg3200_probe_trigger(struct iio_dev *indio_dev) |
| 109 | { |
| 110 | int ret; |
| 111 | struct itg3200 *st = iio_priv(indio_dev); |
| 112 | |
| 113 | st->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name, |
| 114 | indio_dev->id); |
| 115 | if (!st->trig) |
| 116 | return -ENOMEM; |
| 117 | |
| 118 | ret = request_irq(st->i2c->irq, |
| 119 | &iio_trigger_generic_data_rdy_poll, |
| 120 | IRQF_TRIGGER_RISING, |
| 121 | "itg3200_data_rdy", |
| 122 | st->trig); |
| 123 | if (ret) |
| 124 | goto error_free_trig; |
| 125 | |
| 126 | |
| 127 | st->trig->dev.parent = &st->i2c->dev; |
| 128 | st->trig->ops = &itg3200_trigger_ops; |
Lars-Peter Clausen | 1e9663c | 2013-03-25 08:58:00 +0000 | [diff] [blame] | 129 | iio_trigger_set_drvdata(st->trig, indio_dev); |
Manuel Stahl | 9dbf091 | 2013-02-01 08:51:00 +0000 | [diff] [blame] | 130 | ret = iio_trigger_register(st->trig); |
| 131 | if (ret) |
| 132 | goto error_free_irq; |
| 133 | |
| 134 | /* select default trigger */ |
| 135 | indio_dev->trig = st->trig; |
| 136 | |
| 137 | return 0; |
| 138 | |
| 139 | error_free_irq: |
| 140 | free_irq(st->i2c->irq, st->trig); |
| 141 | error_free_trig: |
| 142 | iio_trigger_free(st->trig); |
| 143 | return ret; |
| 144 | } |
| 145 | |
| 146 | void itg3200_remove_trigger(struct iio_dev *indio_dev) |
| 147 | { |
| 148 | struct itg3200 *st = iio_priv(indio_dev); |
| 149 | |
| 150 | iio_trigger_unregister(st->trig); |
| 151 | free_irq(st->i2c->irq, st->trig); |
| 152 | iio_trigger_free(st->trig); |
| 153 | } |