Ge Gao | 09a642b | 2013-02-02 00:26:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 Invensense, Inc. |
| 3 | * |
| 4 | * This software is licensed under the terms of the GNU General Public |
| 5 | * License version 2, as published by the Free Software Foundation, and |
| 6 | * may be copied, distributed, and modified under those terms. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include "inv_mpu_iio.h" |
| 15 | |
| 16 | static void inv_scan_query(struct iio_dev *indio_dev) |
| 17 | { |
| 18 | struct inv_mpu6050_state *st = iio_priv(indio_dev); |
| 19 | |
| 20 | st->chip_config.gyro_fifo_enable = |
| 21 | test_bit(INV_MPU6050_SCAN_GYRO_X, |
| 22 | indio_dev->active_scan_mask) || |
| 23 | test_bit(INV_MPU6050_SCAN_GYRO_Y, |
| 24 | indio_dev->active_scan_mask) || |
| 25 | test_bit(INV_MPU6050_SCAN_GYRO_Z, |
| 26 | indio_dev->active_scan_mask); |
| 27 | |
| 28 | st->chip_config.accl_fifo_enable = |
| 29 | test_bit(INV_MPU6050_SCAN_ACCL_X, |
| 30 | indio_dev->active_scan_mask) || |
| 31 | test_bit(INV_MPU6050_SCAN_ACCL_Y, |
| 32 | indio_dev->active_scan_mask) || |
| 33 | test_bit(INV_MPU6050_SCAN_ACCL_Z, |
| 34 | indio_dev->active_scan_mask); |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * inv_mpu6050_set_enable() - enable chip functions. |
| 39 | * @indio_dev: Device driver instance. |
| 40 | * @enable: enable/disable |
| 41 | */ |
| 42 | static int inv_mpu6050_set_enable(struct iio_dev *indio_dev, bool enable) |
| 43 | { |
| 44 | struct inv_mpu6050_state *st = iio_priv(indio_dev); |
| 45 | int result; |
| 46 | |
| 47 | if (enable) { |
| 48 | result = inv_mpu6050_set_power_itg(st, true); |
| 49 | if (result) |
| 50 | return result; |
| 51 | inv_scan_query(indio_dev); |
| 52 | if (st->chip_config.gyro_fifo_enable) { |
| 53 | result = inv_mpu6050_switch_engine(st, true, |
| 54 | INV_MPU6050_BIT_PWR_GYRO_STBY); |
| 55 | if (result) |
| 56 | return result; |
| 57 | } |
| 58 | if (st->chip_config.accl_fifo_enable) { |
| 59 | result = inv_mpu6050_switch_engine(st, true, |
| 60 | INV_MPU6050_BIT_PWR_ACCL_STBY); |
| 61 | if (result) |
| 62 | return result; |
| 63 | } |
| 64 | result = inv_reset_fifo(indio_dev); |
| 65 | if (result) |
| 66 | return result; |
| 67 | } else { |
| 68 | result = inv_mpu6050_write_reg(st, st->reg->fifo_en, 0); |
| 69 | if (result) |
| 70 | return result; |
| 71 | |
| 72 | result = inv_mpu6050_write_reg(st, st->reg->int_enable, 0); |
| 73 | if (result) |
| 74 | return result; |
| 75 | |
| 76 | result = inv_mpu6050_write_reg(st, st->reg->user_ctrl, 0); |
| 77 | if (result) |
| 78 | return result; |
| 79 | |
| 80 | result = inv_mpu6050_switch_engine(st, false, |
| 81 | INV_MPU6050_BIT_PWR_GYRO_STBY); |
| 82 | if (result) |
| 83 | return result; |
| 84 | |
| 85 | result = inv_mpu6050_switch_engine(st, false, |
| 86 | INV_MPU6050_BIT_PWR_ACCL_STBY); |
| 87 | if (result) |
| 88 | return result; |
| 89 | result = inv_mpu6050_set_power_itg(st, false); |
| 90 | if (result) |
| 91 | return result; |
| 92 | } |
| 93 | st->chip_config.enable = enable; |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * inv_mpu_data_rdy_trigger_set_state() - set data ready interrupt state |
| 100 | * @trig: Trigger instance |
| 101 | * @state: Desired trigger state |
| 102 | */ |
| 103 | static int inv_mpu_data_rdy_trigger_set_state(struct iio_trigger *trig, |
| 104 | bool state) |
| 105 | { |
Lars-Peter Clausen | 1e9663c | 2013-03-25 08:58:00 +0000 | [diff] [blame] | 106 | return inv_mpu6050_set_enable(iio_trigger_get_drvdata(trig), state); |
Ge Gao | 09a642b | 2013-02-02 00:26:00 +0000 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | static const struct iio_trigger_ops inv_mpu_trigger_ops = { |
| 110 | .owner = THIS_MODULE, |
| 111 | .set_trigger_state = &inv_mpu_data_rdy_trigger_set_state, |
| 112 | }; |
| 113 | |
| 114 | int inv_mpu6050_probe_trigger(struct iio_dev *indio_dev) |
| 115 | { |
| 116 | int ret; |
| 117 | struct inv_mpu6050_state *st = iio_priv(indio_dev); |
| 118 | |
| 119 | st->trig = iio_trigger_alloc("%s-dev%d", |
| 120 | indio_dev->name, |
| 121 | indio_dev->id); |
| 122 | if (st->trig == NULL) { |
| 123 | ret = -ENOMEM; |
| 124 | goto error_ret; |
| 125 | } |
| 126 | ret = request_irq(st->client->irq, &iio_trigger_generic_data_rdy_poll, |
| 127 | IRQF_TRIGGER_RISING, |
| 128 | "inv_mpu", |
| 129 | st->trig); |
| 130 | if (ret) |
| 131 | goto error_free_trig; |
| 132 | st->trig->dev.parent = &st->client->dev; |
Ge Gao | 09a642b | 2013-02-02 00:26:00 +0000 | [diff] [blame] | 133 | st->trig->ops = &inv_mpu_trigger_ops; |
Lars-Peter Clausen | 1e9663c | 2013-03-25 08:58:00 +0000 | [diff] [blame] | 134 | iio_trigger_set_drvdata(st->trig, indio_dev); |
Ge Gao | 09a642b | 2013-02-02 00:26:00 +0000 | [diff] [blame] | 135 | ret = iio_trigger_register(st->trig); |
| 136 | if (ret) |
| 137 | goto error_free_irq; |
Srinivas Pandruvada | b07e3b3 | 2014-08-22 21:48:00 +0100 | [diff] [blame] | 138 | indio_dev->trig = iio_trigger_get(st->trig); |
Ge Gao | 09a642b | 2013-02-02 00:26:00 +0000 | [diff] [blame] | 139 | |
| 140 | return 0; |
| 141 | |
| 142 | error_free_irq: |
| 143 | free_irq(st->client->irq, st->trig); |
| 144 | error_free_trig: |
| 145 | iio_trigger_free(st->trig); |
| 146 | error_ret: |
| 147 | return ret; |
| 148 | } |
| 149 | |
| 150 | void inv_mpu6050_remove_trigger(struct inv_mpu6050_state *st) |
| 151 | { |
| 152 | iio_trigger_unregister(st->trig); |
| 153 | free_irq(st->client->irq, st->trig); |
| 154 | iio_trigger_free(st->trig); |
| 155 | } |