Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Jonathan Cameron |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * max1363_ring.c |
| 9 | */ |
| 10 | |
| 11 | #include <linux/interrupt.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 13 | #include <linux/kernel.h> |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 14 | #include <linux/i2c.h> |
Jonathan Cameron | 82020b0 | 2010-05-04 14:43:03 +0100 | [diff] [blame] | 15 | #include <linux/bitops.h> |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 16 | |
| 17 | #include "../iio.h" |
Jonathan Cameron | af5046a | 2011-10-26 17:41:32 +0100 | [diff] [blame^] | 18 | #include "../buffer.h" |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 19 | #include "../ring_sw.h" |
Jonathan Cameron | 3f72395 | 2011-08-24 17:28:39 +0100 | [diff] [blame] | 20 | #include "../trigger_consumer.h" |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 21 | |
| 22 | #include "max1363.h" |
| 23 | |
Jonathan Cameron | 32b5eec | 2011-09-02 17:14:38 +0100 | [diff] [blame] | 24 | int max1363_single_channel_from_ring(const long *mask, struct max1363_state *st) |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 25 | { |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 26 | struct iio_buffer *ring = iio_priv_to_dev(st)->buffer; |
Jonathan Cameron | 32b5eec | 2011-09-02 17:14:38 +0100 | [diff] [blame] | 27 | int count = 0, ret, index; |
Jonathan Cameron | 82020b0 | 2010-05-04 14:43:03 +0100 | [diff] [blame] | 28 | u8 *ring_data; |
Jonathan Cameron | 32b5eec | 2011-09-02 17:14:38 +0100 | [diff] [blame] | 29 | index = find_first_bit(mask, MAX1363_MAX_CHANNELS); |
| 30 | |
| 31 | if (!(test_bit(index, st->current_mode->modemask))) { |
Jonathan Cameron | 82020b0 | 2010-05-04 14:43:03 +0100 | [diff] [blame] | 32 | ret = -EBUSY; |
| 33 | goto error_ret; |
| 34 | } |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 35 | |
Jonathan Cameron | 5565a45 | 2011-05-18 14:42:24 +0100 | [diff] [blame] | 36 | ring_data = kmalloc(ring->access->get_bytes_per_datum(ring), |
| 37 | GFP_KERNEL); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 38 | if (ring_data == NULL) { |
| 39 | ret = -ENOMEM; |
| 40 | goto error_ret; |
| 41 | } |
Jonathan Cameron | 5565a45 | 2011-05-18 14:42:24 +0100 | [diff] [blame] | 42 | ret = ring->access->read_last(ring, ring_data); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 43 | if (ret) |
| 44 | goto error_free_ring_data; |
Jonathan Cameron | 82020b0 | 2010-05-04 14:43:03 +0100 | [diff] [blame] | 45 | /* Need a count of channels prior to this one */ |
Jonathan Cameron | 32b5eec | 2011-09-02 17:14:38 +0100 | [diff] [blame] | 46 | |
| 47 | count = bitmap_weight(mask, index - 1); |
Jonathan Cameron | 3bf877c | 2010-05-04 14:43:10 +0100 | [diff] [blame] | 48 | if (st->chip_info->bits != 8) |
Jonathan Cameron | 81b77f9 | 2010-05-16 21:29:25 +0100 | [diff] [blame] | 49 | ret = ((int)(ring_data[count*2 + 0] & 0x0F) << 8) |
Jonathan Cameron | 3bf877c | 2010-05-04 14:43:10 +0100 | [diff] [blame] | 50 | + (int)(ring_data[count*2 + 1]); |
| 51 | else |
Jonathan Cameron | 81b77f9 | 2010-05-16 21:29:25 +0100 | [diff] [blame] | 52 | ret = ring_data[count]; |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 53 | |
| 54 | error_free_ring_data: |
| 55 | kfree(ring_data); |
| 56 | error_ret: |
| 57 | return ret; |
| 58 | } |
| 59 | |
Jonathan Cameron | 58f0a25 | 2011-05-18 14:42:38 +0100 | [diff] [blame] | 60 | |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 61 | /** |
Jonathan Cameron | c40ab87 | 2010-06-26 12:54:14 +0100 | [diff] [blame] | 62 | * max1363_ring_preenable() - setup the parameters of the ring before enabling |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 63 | * |
| 64 | * The complex nature of the setting of the nuber of bytes per datum is due |
| 65 | * to this driver currently ensuring that the timestamp is stored at an 8 |
| 66 | * byte boundary. |
| 67 | **/ |
| 68 | static int max1363_ring_preenable(struct iio_dev *indio_dev) |
| 69 | { |
Jonathan Cameron | 3dba81b | 2011-04-15 18:55:59 +0100 | [diff] [blame] | 70 | struct max1363_state *st = iio_priv(indio_dev); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 71 | struct iio_buffer *ring = indio_dev->buffer; |
Jonathan Cameron | 9cc5598 | 2011-04-15 18:55:57 +0100 | [diff] [blame] | 72 | size_t d_size = 0; |
Jonathan Cameron | 82020b0 | 2010-05-04 14:43:03 +0100 | [diff] [blame] | 73 | unsigned long numvals; |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 74 | |
Jonathan Cameron | 82020b0 | 2010-05-04 14:43:03 +0100 | [diff] [blame] | 75 | /* |
| 76 | * Need to figure out the current mode based upon the requested |
| 77 | * scan mask in iio_dev |
| 78 | */ |
Manuel Stahl | bf32963 | 2010-08-31 11:32:52 +0200 | [diff] [blame] | 79 | st->current_mode = max1363_match_mode(ring->scan_mask, |
Jonathan Cameron | 82020b0 | 2010-05-04 14:43:03 +0100 | [diff] [blame] | 80 | st->chip_info); |
| 81 | if (!st->current_mode) |
| 82 | return -EINVAL; |
| 83 | |
| 84 | max1363_set_scan_mode(st); |
| 85 | |
Jonathan Cameron | 32b5eec | 2011-09-02 17:14:38 +0100 | [diff] [blame] | 86 | numvals = bitmap_weight(st->current_mode->modemask, |
| 87 | indio_dev->masklength); |
Jonathan Cameron | 5565a45 | 2011-05-18 14:42:24 +0100 | [diff] [blame] | 88 | if (ring->access->set_bytes_per_datum) { |
Jonathan Cameron | 9cc5598 | 2011-04-15 18:55:57 +0100 | [diff] [blame] | 89 | if (ring->scan_timestamp) |
| 90 | d_size += sizeof(s64); |
Jonathan Cameron | 3bf877c | 2010-05-04 14:43:10 +0100 | [diff] [blame] | 91 | if (st->chip_info->bits != 8) |
Jonathan Cameron | 9cc5598 | 2011-04-15 18:55:57 +0100 | [diff] [blame] | 92 | d_size += numvals*2; |
Jonathan Cameron | 3bf877c | 2010-05-04 14:43:10 +0100 | [diff] [blame] | 93 | else |
Jonathan Cameron | 9cc5598 | 2011-04-15 18:55:57 +0100 | [diff] [blame] | 94 | d_size += numvals; |
| 95 | if (ring->scan_timestamp && (d_size % 8)) |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 96 | d_size += 8 - (d_size % 8); |
Jonathan Cameron | 5565a45 | 2011-05-18 14:42:24 +0100 | [diff] [blame] | 97 | ring->access->set_bytes_per_datum(ring, d_size); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
Jonathan Cameron | 6da288a | 2011-05-18 14:41:23 +0100 | [diff] [blame] | 103 | static irqreturn_t max1363_trigger_handler(int irq, void *p) |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 104 | { |
Jonathan Cameron | 6da288a | 2011-05-18 14:41:23 +0100 | [diff] [blame] | 105 | struct iio_poll_func *pf = p; |
Jonathan Cameron | e65bc6a | 2011-08-24 17:28:36 +0100 | [diff] [blame] | 106 | struct iio_dev *indio_dev = pf->indio_dev; |
Jonathan Cameron | 3dba81b | 2011-04-15 18:55:59 +0100 | [diff] [blame] | 107 | struct max1363_state *st = iio_priv(indio_dev); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 108 | s64 time_ns; |
| 109 | __u8 *rxbuf; |
| 110 | int b_sent; |
| 111 | size_t d_size; |
Jonathan Cameron | 32b5eec | 2011-09-02 17:14:38 +0100 | [diff] [blame] | 112 | unsigned long numvals = bitmap_weight(st->current_mode->modemask, |
| 113 | MAX1363_MAX_CHANNELS); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 114 | |
| 115 | /* Ensure the timestamp is 8 byte aligned */ |
Jonathan Cameron | 3bf877c | 2010-05-04 14:43:10 +0100 | [diff] [blame] | 116 | if (st->chip_info->bits != 8) |
| 117 | d_size = numvals*2 + sizeof(s64); |
| 118 | else |
| 119 | d_size = numvals + sizeof(s64); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 120 | if (d_size % sizeof(s64)) |
| 121 | d_size += sizeof(s64) - (d_size % sizeof(s64)); |
| 122 | |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 123 | /* Monitor mode prevents reading. Whilst not currently implemented |
| 124 | * might as well have this test in here in the meantime as it does |
| 125 | * no harm. |
| 126 | */ |
Jonathan Cameron | 82020b0 | 2010-05-04 14:43:03 +0100 | [diff] [blame] | 127 | if (numvals == 0) |
Jonathan Cameron | 6da288a | 2011-05-18 14:41:23 +0100 | [diff] [blame] | 128 | return IRQ_HANDLED; |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 129 | |
| 130 | rxbuf = kmalloc(d_size, GFP_KERNEL); |
| 131 | if (rxbuf == NULL) |
Jonathan Cameron | 6da288a | 2011-05-18 14:41:23 +0100 | [diff] [blame] | 132 | return -ENOMEM; |
Jonathan Cameron | 3bf877c | 2010-05-04 14:43:10 +0100 | [diff] [blame] | 133 | if (st->chip_info->bits != 8) |
| 134 | b_sent = i2c_master_recv(st->client, rxbuf, numvals*2); |
| 135 | else |
| 136 | b_sent = i2c_master_recv(st->client, rxbuf, numvals); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 137 | if (b_sent < 0) |
| 138 | goto done; |
| 139 | |
| 140 | time_ns = iio_get_time_ns(); |
| 141 | |
| 142 | memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns)); |
| 143 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 144 | indio_dev->buffer->access->store_to(indio_dev->buffer, rxbuf, time_ns); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 145 | done: |
Jonathan Cameron | 6da288a | 2011-05-18 14:41:23 +0100 | [diff] [blame] | 146 | iio_trigger_notify_done(indio_dev->trig); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 147 | kfree(rxbuf); |
Jonathan Cameron | 6da288a | 2011-05-18 14:41:23 +0100 | [diff] [blame] | 148 | |
| 149 | return IRQ_HANDLED; |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 150 | } |
| 151 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 152 | static const struct iio_buffer_setup_ops max1363_ring_setup_ops = { |
Jonathan Cameron | 3b99fb7 | 2011-09-21 11:15:53 +0100 | [diff] [blame] | 153 | .postenable = &iio_triggered_buffer_postenable, |
Jonathan Cameron | 5565a45 | 2011-05-18 14:42:24 +0100 | [diff] [blame] | 154 | .preenable = &max1363_ring_preenable, |
Jonathan Cameron | 3b99fb7 | 2011-09-21 11:15:53 +0100 | [diff] [blame] | 155 | .predisable = &iio_triggered_buffer_predisable, |
Jonathan Cameron | 5565a45 | 2011-05-18 14:42:24 +0100 | [diff] [blame] | 156 | }; |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 157 | |
| 158 | int max1363_register_ring_funcs_and_init(struct iio_dev *indio_dev) |
| 159 | { |
Jonathan Cameron | 3dba81b | 2011-04-15 18:55:59 +0100 | [diff] [blame] | 160 | struct max1363_state *st = iio_priv(indio_dev); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 161 | int ret = 0; |
| 162 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 163 | indio_dev->buffer = iio_sw_rb_allocate(indio_dev); |
| 164 | if (!indio_dev->buffer) { |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 165 | ret = -ENOMEM; |
| 166 | goto error_ret; |
| 167 | } |
Jonathan Cameron | 0ed731d | 2011-05-18 14:42:39 +0100 | [diff] [blame] | 168 | indio_dev->pollfunc = iio_alloc_pollfunc(NULL, |
| 169 | &max1363_trigger_handler, |
| 170 | IRQF_ONESHOT, |
| 171 | indio_dev, |
| 172 | "%s_consumer%d", |
| 173 | st->client->name, |
| 174 | indio_dev->id); |
Jonathan Cameron | 6da288a | 2011-05-18 14:41:23 +0100 | [diff] [blame] | 175 | if (indio_dev->pollfunc == NULL) { |
| 176 | ret = -ENOMEM; |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 177 | goto error_deallocate_sw_rb; |
Jonathan Cameron | 6da288a | 2011-05-18 14:41:23 +0100 | [diff] [blame] | 178 | } |
Jonathan Cameron | 5565a45 | 2011-05-18 14:42:24 +0100 | [diff] [blame] | 179 | /* Effectively select the ring buffer implementation */ |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 180 | indio_dev->buffer->access = &ring_sw_access_funcs; |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 181 | /* Ring buffer functions - here trigger setup related */ |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 182 | indio_dev->buffer->setup_ops = &max1363_ring_setup_ops; |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 183 | |
| 184 | /* Flag that polled ring buffering is possible */ |
Jonathan Cameron | ec3afa4 | 2011-09-21 11:15:54 +0100 | [diff] [blame] | 185 | indio_dev->modes |= INDIO_BUFFER_TRIGGERED; |
Jonathan Cameron | 6da288a | 2011-05-18 14:41:23 +0100 | [diff] [blame] | 186 | |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 187 | return 0; |
Jonathan Cameron | 0ed731d | 2011-05-18 14:42:39 +0100 | [diff] [blame] | 188 | |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 189 | error_deallocate_sw_rb: |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 190 | iio_sw_rb_free(indio_dev->buffer); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 191 | error_ret: |
| 192 | return ret; |
| 193 | } |
| 194 | |
| 195 | void max1363_ring_cleanup(struct iio_dev *indio_dev) |
| 196 | { |
| 197 | /* ensure that the trigger has been detached */ |
Jonathan Cameron | 0ed731d | 2011-05-18 14:42:39 +0100 | [diff] [blame] | 198 | iio_dealloc_pollfunc(indio_dev->pollfunc); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 199 | iio_sw_rb_free(indio_dev->buffer); |
Jonathan Cameron | 0a1231d | 2009-08-18 18:06:29 +0100 | [diff] [blame] | 200 | } |