1 /* 2 * STMicroelectronics gyroscopes driver 3 * 4 * Copyright 2012-2013 STMicroelectronics Inc. 5 * 6 * Denis Ciocca <denis.ciocca@st.com> 7 * 8 * Licensed under the GPL-2. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/kernel.h> 13 #include <linux/slab.h> 14 #include <linux/stat.h> 15 #include <linux/interrupt.h> 16 #include <linux/i2c.h> 17 #include <linux/delay.h> 18 #include <linux/iio/iio.h> 19 #include <linux/iio/buffer.h> 20 #include <linux/iio/trigger_consumer.h> 21 #include <linux/iio/triggered_buffer.h> 22 23 #include <linux/iio/common/st_sensors.h> 24 #include "st_gyro.h" 25 26 int st_gyro_trig_set_state(struct iio_trigger *trig, bool state) 27 { 28 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 29 30 return st_sensors_set_dataready_irq(indio_dev, state); 31 } 32 33 static int st_gyro_buffer_preenable(struct iio_dev *indio_dev) 34 { 35 return st_sensors_set_enable(indio_dev, true); 36 } 37 38 static int st_gyro_buffer_postenable(struct iio_dev *indio_dev) 39 { 40 int err; 41 struct st_sensor_data *gdata = iio_priv(indio_dev); 42 43 gdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); 44 if (gdata->buffer_data == NULL) { 45 err = -ENOMEM; 46 goto allocate_memory_error; 47 } 48 49 err = st_sensors_set_axis_enable(indio_dev, 50 (u8)indio_dev->active_scan_mask[0]); 51 if (err < 0) 52 goto st_gyro_buffer_postenable_error; 53 54 err = iio_triggered_buffer_postenable(indio_dev); 55 if (err < 0) 56 goto st_gyro_buffer_postenable_error; 57 58 return err; 59 60 st_gyro_buffer_postenable_error: 61 kfree(gdata->buffer_data); 62 allocate_memory_error: 63 return err; 64 } 65 66 static int st_gyro_buffer_predisable(struct iio_dev *indio_dev) 67 { 68 int err; 69 struct st_sensor_data *gdata = iio_priv(indio_dev); 70 71 err = iio_triggered_buffer_predisable(indio_dev); 72 if (err < 0) 73 goto st_gyro_buffer_predisable_error; 74 75 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 76 if (err < 0) 77 goto st_gyro_buffer_predisable_error; 78 79 err = st_sensors_set_enable(indio_dev, false); 80 81 st_gyro_buffer_predisable_error: 82 kfree(gdata->buffer_data); 83 return err; 84 } 85 86 static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = { 87 .preenable = &st_gyro_buffer_preenable, 88 .postenable = &st_gyro_buffer_postenable, 89 .predisable = &st_gyro_buffer_predisable, 90 }; 91 92 int st_gyro_allocate_ring(struct iio_dev *indio_dev) 93 { 94 return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 95 &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops); 96 } 97 98 void st_gyro_deallocate_ring(struct iio_dev *indio_dev) 99 { 100 iio_triggered_buffer_cleanup(indio_dev); 101 } 102 103 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 104 MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer"); 105 MODULE_LICENSE("GPL v2"); 106