1 /*
2 * common-board-devices.c
3 *
4 * Copyright (C) 2011 CompuLab, Ltd.
5 * Author: Mike Rapoport <mike@compulab.co.il>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19 * 02110-1301 USA
20 *
21 */
22
23 #include <linux/gpio.h>
24 #include <linux/spi/spi.h>
25 #include <linux/spi/ads7846.h>
26
27 #include <linux/platform_data/spi-omap2-mcspi.h>
28
29 #include "common.h"
30 #include "common-board-devices.h"
31
32 #if IS_ENABLED(CONFIG_TOUCHSCREEN_ADS7846)
33 static struct omap2_mcspi_device_config ads7846_mcspi_config = {
34 .turbo_mode = 0,
35 };
36
37 static struct ads7846_platform_data ads7846_config = {
38 .x_max = 0x0fff,
39 .y_max = 0x0fff,
40 .x_plate_ohms = 180,
41 .pressure_max = 255,
42 .debounce_max = 10,
43 .debounce_tol = 3,
44 .debounce_rep = 1,
45 .gpio_pendown = -EINVAL,
46 .keep_vref_on = 1,
47 };
48
49 static struct spi_board_info ads7846_spi_board_info __initdata = {
50 .modalias = "ads7846",
51 .bus_num = -EINVAL,
52 .chip_select = 0,
53 .max_speed_hz = 1500000,
54 .controller_data = &ads7846_mcspi_config,
55 .irq = -EINVAL,
56 .platform_data = &ads7846_config,
57 };
58
omap_ads7846_init(int bus_num,int gpio_pendown,int gpio_debounce,struct ads7846_platform_data * board_pdata)59 void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
60 struct ads7846_platform_data *board_pdata)
61 {
62 struct spi_board_info *spi_bi = &ads7846_spi_board_info;
63 int err;
64
65 /*
66 * If a board defines get_pendown_state() function, request the pendown
67 * GPIO and set the GPIO debounce time.
68 * If a board does not define the get_pendown_state() function, then
69 * the ads7846 driver will setup the pendown GPIO itself.
70 */
71 if (board_pdata && board_pdata->get_pendown_state) {
72 err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
73 if (err) {
74 pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
75 return;
76 }
77
78 if (gpio_debounce)
79 gpio_set_debounce(gpio_pendown, gpio_debounce);
80
81 gpio_export(gpio_pendown, 0);
82 }
83
84 spi_bi->bus_num = bus_num;
85 spi_bi->irq = gpio_to_irq(gpio_pendown);
86
87 ads7846_config.gpio_pendown = gpio_pendown;
88
89 if (board_pdata) {
90 board_pdata->gpio_pendown = gpio_pendown;
91 board_pdata->gpio_pendown_debounce = gpio_debounce;
92 spi_bi->platform_data = board_pdata;
93 }
94
95 spi_register_board_info(&ads7846_spi_board_info, 1);
96 }
97 #else
omap_ads7846_init(int bus_num,int gpio_pendown,int gpio_debounce,struct ads7846_platform_data * board_pdata)98 void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
99 struct ads7846_platform_data *board_pdata)
100 {
101 }
102 #endif
103