1/*
2 * I2C - bitbanged generic gpio implementation
3 *
4 * Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 *
24 * This is like an abstract class for gpio, a real implementation provides
25 * functions for the ops that use the underlying OS gpio arrangements.
26 */
27
28#define LWSBBSPI_FLAG_USE_NCMD3 (1 << 7)
29#define LWSBBSPI_FLAG_USE_NCMD2 (1 << 6)
30#define LWSBBSPI_FLAG_USE_NCMD1 (1 << 5)
31#define LWSBBSPI_FLAG_USE_NCMD0 (1 << 4)
32#define LWSBBSPI_FLAG_USE_NCS3 (1 << 3)
33#define LWSBBSPI_FLAG_USE_NCS2 (1 << 2)
34#define LWSBBSPI_FLAG_USE_NCS1 (1 << 1)
35#define LWSBBSPI_FLAG_USE_NCS0 (1 << 0)
36
37#define LWS_SPI_BB_MAX_CH 4
38
39typedef struct lws_bb_spi {
40 lws_spi_ops_t bb_ops; /* init to lws_bb_spi_ops */
41
42 /* implementation-specific members */
43 const lws_gpio_ops_t *gpio;
44
45 _lws_plat_gpio_t clk;
46 _lws_plat_gpio_t ncs[LWS_SPI_BB_MAX_CH];
47 _lws_plat_gpio_t ncmd[LWS_SPI_BB_MAX_CH];
48 _lws_plat_gpio_t mosi;
49 _lws_plat_gpio_t miso;
50
51 uint8_t unit;
52
53 uint8_t flags;
54} lws_bb_spi_t;
55
56#define lws_bb_spi_ops \
57 .init = lws_bb_spi_init, \
58 .queue = lws_bb_spi_queue
59
60int
61lws_bb_spi_init(const lws_spi_ops_t *octx);
62
63int
64lws_bb_spi_queue(const lws_spi_ops_t *octx, const lws_spi_desc_t *desc);
65