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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | /* * itg3200_buffer.c -- support InvenSense ITG3200 * Digital 3-Axis Gyroscope driver * * Copyright (c) 2011 Christian Strobel <christian.strobel@iis.fraunhofer.de> * Copyright (c) 2011 Manuel Stahl <manuel.stahl@iis.fraunhofer.de> * Copyright (c) 2012 Thorsten Nowak <thorsten.nowak@iis.fraunhofer.de> * * 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. */ #include <linux/slab.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/iio/iio.h> #include <linux/iio/buffer.h> #include <linux/iio/trigger.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #include <linux/iio/gyro/itg3200.h> static int itg3200_read_all_channels(struct i2c_client *i2c, __be16 *buf) { u8 tx = 0x80 | ITG3200_REG_TEMP_OUT_H; struct i2c_msg msg[2] = { { .addr = i2c->addr, .flags = i2c->flags, .len = 1, .buf = &tx, }, { .addr = i2c->addr, .flags = i2c->flags | I2C_M_RD, .len = ITG3200_SCAN_ELEMENTS * sizeof(s16), .buf = (char *)&buf, }, }; return i2c_transfer(i2c->adapter, msg, 2); } static irqreturn_t itg3200_trigger_handler(int irq, void *p) { struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct itg3200 *st = iio_priv(indio_dev); /* * Ensure correct alignment and padding including for the * timestamp that may be inserted. */ struct { __be16 buf[ITG3200_SCAN_ELEMENTS]; s64 ts __aligned(8); } scan; int ret = itg3200_read_all_channels(st->i2c, scan.buf); if (ret < 0) goto error_ret; iio_push_to_buffers_with_timestamp(indio_dev, &scan, pf->timestamp); error_ret: iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED; } int itg3200_buffer_configure(struct iio_dev *indio_dev) { return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, itg3200_trigger_handler, NULL); } void itg3200_buffer_unconfigure(struct iio_dev *indio_dev) { iio_triggered_buffer_cleanup(indio_dev); } static int itg3200_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state) { struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); int ret; u8 msc; ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, &msc); if (ret) goto error_ret; if (state) msc |= ITG3200_IRQ_DATA_RDY_ENABLE; else msc &= ~ITG3200_IRQ_DATA_RDY_ENABLE; ret = itg3200_write_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, msc); if (ret) goto error_ret; error_ret: return ret; } static const struct iio_trigger_ops itg3200_trigger_ops = { .set_trigger_state = &itg3200_data_rdy_trigger_set_state, }; int itg3200_probe_trigger(struct iio_dev *indio_dev) { int ret; struct itg3200 *st = iio_priv(indio_dev); st->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name, indio_dev->id); if (!st->trig) return -ENOMEM; ret = request_irq(st->i2c->irq, &iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING, "itg3200_data_rdy", st->trig); if (ret) goto error_free_trig; st->trig->dev.parent = &st->i2c->dev; st->trig->ops = &itg3200_trigger_ops; iio_trigger_set_drvdata(st->trig, indio_dev); ret = iio_trigger_register(st->trig); if (ret) goto error_free_irq; /* select default trigger */ indio_dev->trig = iio_trigger_get(st->trig); return 0; error_free_irq: free_irq(st->i2c->irq, st->trig); error_free_trig: iio_trigger_free(st->trig); return ret; } void itg3200_remove_trigger(struct iio_dev *indio_dev) { struct itg3200 *st = iio_priv(indio_dev); iio_trigger_unregister(st->trig); free_irq(st->i2c->irq, st->trig); iio_trigger_free(st->trig); } |