Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame^] | 1 | #include <linux/interrupt.h> |
| 2 | #include <linux/irq.h> |
| 3 | #include <linux/gpio.h> |
| 4 | #include <linux/workqueue.h> |
| 5 | #include <linux/mutex.h> |
| 6 | #include <linux/device.h> |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/spi/spi.h> |
| 9 | #include <linux/sysfs.h> |
| 10 | #include <linux/list.h> |
| 11 | |
| 12 | #include "../iio.h" |
| 13 | #include "../sysfs.h" |
| 14 | #include "../ring_sw.h" |
| 15 | #include "../accel/accel.h" |
| 16 | #include "../trigger.h" |
| 17 | #include "adis16400.h" |
| 18 | |
| 19 | /** |
| 20 | * combine_8_to_16() utility function to munge to u8s into u16 |
| 21 | **/ |
| 22 | static inline u16 combine_8_to_16(u8 lower, u8 upper) |
| 23 | { |
| 24 | u16 _lower = lower; |
| 25 | u16 _upper = upper; |
| 26 | return _lower | (_upper << 8); |
| 27 | } |
| 28 | |
| 29 | static IIO_SCAN_EL_C(supply, ADIS16400_SCAN_SUPPLY, IIO_SIGNED(14), |
| 30 | ADIS16400_SUPPLY_OUT, NULL); |
| 31 | |
| 32 | static IIO_SCAN_EL_C(gyro_x, ADIS16400_SCAN_GYRO_X, IIO_SIGNED(14), |
| 33 | ADIS16400_XGYRO_OUT, NULL); |
| 34 | static IIO_SCAN_EL_C(gyro_y, ADIS16400_SCAN_GYRO_Y, IIO_SIGNED(14), |
| 35 | ADIS16400_YGYRO_OUT, NULL); |
| 36 | static IIO_SCAN_EL_C(gyro_z, ADIS16400_SCAN_GYRO_Z, IIO_SIGNED(14), |
| 37 | ADIS16400_ZGYRO_OUT, NULL); |
| 38 | |
| 39 | static IIO_SCAN_EL_C(accel_x, ADIS16400_SCAN_ACC_X, IIO_SIGNED(14), |
| 40 | ADIS16400_XACCL_OUT, NULL); |
| 41 | static IIO_SCAN_EL_C(accel_y, ADIS16400_SCAN_ACC_Y, IIO_SIGNED(14), |
| 42 | ADIS16400_YACCL_OUT, NULL); |
| 43 | static IIO_SCAN_EL_C(accel_z, ADIS16400_SCAN_ACC_Z, IIO_SIGNED(14), |
| 44 | ADIS16400_ZACCL_OUT, NULL); |
| 45 | |
| 46 | static IIO_SCAN_EL_C(magn_x, ADIS16400_SCAN_MAGN_X, IIO_SIGNED(14), |
| 47 | ADIS16400_XMAGN_OUT, NULL); |
| 48 | static IIO_SCAN_EL_C(magn_y, ADIS16400_SCAN_MAGN_Y, IIO_SIGNED(14), |
| 49 | ADIS16400_YMAGN_OUT, NULL); |
| 50 | static IIO_SCAN_EL_C(magn_z, ADIS16400_SCAN_MAGN_Z, IIO_SIGNED(14), |
| 51 | ADIS16400_ZMAGN_OUT, NULL); |
| 52 | |
| 53 | static IIO_SCAN_EL_C(temp, ADIS16400_SCAN_TEMP, IIO_SIGNED(12), |
| 54 | ADIS16400_TEMP_OUT, NULL); |
| 55 | static IIO_SCAN_EL_C(adc_0, ADIS16400_SCAN_ADC_0, IIO_SIGNED(12), |
| 56 | ADIS16400_AUX_ADC, NULL); |
| 57 | |
| 58 | static IIO_SCAN_EL_TIMESTAMP(12); |
| 59 | |
| 60 | static struct attribute *adis16400_scan_el_attrs[] = { |
| 61 | &iio_scan_el_supply.dev_attr.attr, |
| 62 | &iio_scan_el_gyro_x.dev_attr.attr, |
| 63 | &iio_scan_el_gyro_y.dev_attr.attr, |
| 64 | &iio_scan_el_gyro_z.dev_attr.attr, |
| 65 | &iio_scan_el_accel_x.dev_attr.attr, |
| 66 | &iio_scan_el_accel_y.dev_attr.attr, |
| 67 | &iio_scan_el_accel_z.dev_attr.attr, |
| 68 | &iio_scan_el_magn_x.dev_attr.attr, |
| 69 | &iio_scan_el_magn_y.dev_attr.attr, |
| 70 | &iio_scan_el_magn_z.dev_attr.attr, |
| 71 | &iio_scan_el_temp.dev_attr.attr, |
| 72 | &iio_scan_el_adc_0.dev_attr.attr, |
| 73 | &iio_scan_el_timestamp.dev_attr.attr, |
| 74 | NULL, |
| 75 | }; |
| 76 | |
| 77 | static struct attribute_group adis16400_scan_el_group = { |
| 78 | .attrs = adis16400_scan_el_attrs, |
| 79 | .name = "scan_elements", |
| 80 | }; |
| 81 | |
| 82 | /** |
| 83 | * adis16400_poll_func_th() top half interrupt handler called by trigger |
| 84 | * @private_data: iio_dev |
| 85 | **/ |
| 86 | static void adis16400_poll_func_th(struct iio_dev *indio_dev) |
| 87 | { |
| 88 | struct adis16400_state *st = iio_dev_get_devdata(indio_dev); |
| 89 | st->last_timestamp = indio_dev->trig->timestamp; |
| 90 | schedule_work(&st->work_trigger_to_ring); |
| 91 | /* Indicate that this interrupt is being handled */ |
| 92 | |
| 93 | /* Technically this is trigger related, but without this |
| 94 | * handler running there is currently no way for the interrupt |
| 95 | * to clear. |
| 96 | */ |
| 97 | } |
| 98 | |
| 99 | /* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device |
| 100 | * specific to be rolled into the core. |
| 101 | */ |
| 102 | static void adis16400_trigger_bh_to_ring(struct work_struct *work_s) |
| 103 | { |
| 104 | struct adis16400_state *st |
| 105 | = container_of(work_s, struct adis16400_state, |
| 106 | work_trigger_to_ring); |
| 107 | |
| 108 | int i = 0; |
| 109 | s16 *data; |
| 110 | size_t datasize = st->indio_dev |
| 111 | ->ring->access.get_bpd(st->indio_dev->ring); |
| 112 | |
| 113 | data = kmalloc(datasize , GFP_KERNEL); |
| 114 | if (data == NULL) { |
| 115 | dev_err(&st->us->dev, "memory alloc failed in ring bh"); |
| 116 | return; |
| 117 | } |
| 118 | |
| 119 | if (st->indio_dev->scan_count) |
| 120 | if (adis16400_spi_read_burst(&st->indio_dev->dev, st->rx) >= 0) |
| 121 | for (; i < st->indio_dev->scan_count; i++) { |
| 122 | data[i] = combine_8_to_16(st->rx[i*2+1], |
| 123 | st->rx[i*2]); |
| 124 | } |
| 125 | |
| 126 | /* Guaranteed to be aligned with 8 byte boundary */ |
| 127 | if (st->indio_dev->scan_timestamp) |
| 128 | *((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp; |
| 129 | |
| 130 | st->indio_dev->ring->access.store_to(st->indio_dev->ring, |
| 131 | (u8 *)data, |
| 132 | st->last_timestamp); |
| 133 | |
| 134 | iio_trigger_notify_done(st->indio_dev->trig); |
| 135 | kfree(data); |
| 136 | |
| 137 | return; |
| 138 | } |
| 139 | /* in these circumstances is it better to go with unaligned packing and |
| 140 | * deal with the cost?*/ |
| 141 | static int adis16400_data_rdy_ring_preenable(struct iio_dev *indio_dev) |
| 142 | { |
| 143 | size_t size; |
| 144 | dev_dbg(&indio_dev->dev, "%s\n", __func__); |
| 145 | /* Check if there are any scan elements enabled, if not fail*/ |
| 146 | if (!(indio_dev->scan_count || indio_dev->scan_timestamp)) |
| 147 | return -EINVAL; |
| 148 | |
| 149 | if (indio_dev->ring->access.set_bpd) { |
| 150 | if (indio_dev->scan_timestamp) |
| 151 | if (indio_dev->scan_count) /* Timestamp and data */ |
| 152 | size = 6*sizeof(s64); |
| 153 | else /* Timestamp only */ |
| 154 | size = sizeof(s64); |
| 155 | else /* Data only */ |
| 156 | size = indio_dev->scan_count*sizeof(s16); |
| 157 | indio_dev->ring->access.set_bpd(indio_dev->ring, size); |
| 158 | } |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static int adis16400_data_rdy_ring_postenable(struct iio_dev *indio_dev) |
| 164 | { |
| 165 | return indio_dev->trig |
| 166 | ? iio_trigger_attach_poll_func(indio_dev->trig, |
| 167 | indio_dev->pollfunc) |
| 168 | : 0; |
| 169 | } |
| 170 | |
| 171 | static int adis16400_data_rdy_ring_predisable(struct iio_dev *indio_dev) |
| 172 | { |
| 173 | return indio_dev->trig |
| 174 | ? iio_trigger_dettach_poll_func(indio_dev->trig, |
| 175 | indio_dev->pollfunc) |
| 176 | : 0; |
| 177 | } |
| 178 | |
| 179 | void adis16400_unconfigure_ring(struct iio_dev *indio_dev) |
| 180 | { |
| 181 | kfree(indio_dev->pollfunc); |
| 182 | iio_sw_rb_free(indio_dev->ring); |
| 183 | } |
| 184 | |
| 185 | int adis16400_configure_ring(struct iio_dev *indio_dev) |
| 186 | { |
| 187 | int ret = 0; |
| 188 | struct adis16400_state *st = indio_dev->dev_data; |
| 189 | struct iio_ring_buffer *ring; |
| 190 | INIT_WORK(&st->work_trigger_to_ring, adis16400_trigger_bh_to_ring); |
| 191 | /* Set default scan mode */ |
| 192 | |
| 193 | iio_scan_mask_set(indio_dev, iio_scan_el_supply.number); |
| 194 | iio_scan_mask_set(indio_dev, iio_scan_el_gyro_x.number); |
| 195 | iio_scan_mask_set(indio_dev, iio_scan_el_gyro_y.number); |
| 196 | iio_scan_mask_set(indio_dev, iio_scan_el_gyro_z.number); |
| 197 | iio_scan_mask_set(indio_dev, iio_scan_el_accel_x.number); |
| 198 | iio_scan_mask_set(indio_dev, iio_scan_el_accel_y.number); |
| 199 | iio_scan_mask_set(indio_dev, iio_scan_el_accel_z.number); |
| 200 | iio_scan_mask_set(indio_dev, iio_scan_el_magn_x.number); |
| 201 | iio_scan_mask_set(indio_dev, iio_scan_el_magn_y.number); |
| 202 | iio_scan_mask_set(indio_dev, iio_scan_el_magn_z.number); |
| 203 | iio_scan_mask_set(indio_dev, iio_scan_el_temp.number); |
| 204 | iio_scan_mask_set(indio_dev, iio_scan_el_adc_0.number); |
| 205 | indio_dev->scan_timestamp = true; |
| 206 | |
| 207 | indio_dev->scan_el_attrs = &adis16400_scan_el_group; |
| 208 | |
| 209 | ring = iio_sw_rb_allocate(indio_dev); |
| 210 | if (!ring) { |
| 211 | ret = -ENOMEM; |
| 212 | return ret; |
| 213 | } |
| 214 | indio_dev->ring = ring; |
| 215 | /* Effectively select the ring buffer implementation */ |
| 216 | iio_ring_sw_register_funcs(&ring->access); |
| 217 | ring->preenable = &adis16400_data_rdy_ring_preenable; |
| 218 | ring->postenable = &adis16400_data_rdy_ring_postenable; |
| 219 | ring->predisable = &adis16400_data_rdy_ring_predisable; |
| 220 | ring->owner = THIS_MODULE; |
| 221 | |
| 222 | indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL); |
| 223 | if (indio_dev->pollfunc == NULL) { |
| 224 | ret = -ENOMEM; |
| 225 | goto error_iio_sw_rb_free;; |
| 226 | } |
| 227 | indio_dev->pollfunc->poll_func_main = &adis16400_poll_func_th; |
| 228 | indio_dev->pollfunc->private_data = indio_dev; |
| 229 | indio_dev->modes |= INDIO_RING_TRIGGERED; |
| 230 | return 0; |
| 231 | |
| 232 | error_iio_sw_rb_free: |
| 233 | iio_sw_rb_free(indio_dev->ring); |
| 234 | return ret; |
| 235 | } |
| 236 | |
| 237 | int adis16400_initialize_ring(struct iio_ring_buffer *ring) |
| 238 | { |
| 239 | return iio_ring_buffer_register(ring, 0); |
| 240 | } |
| 241 | |
| 242 | void adis16400_uninitialize_ring(struct iio_ring_buffer *ring) |
| 243 | { |
| 244 | iio_ring_buffer_unregister(ring); |
| 245 | } |