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96974a24 MR |
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 <plat/mcspi.h> | |
28 | ||
29 | #include "common-board-devices.h" | |
30 | ||
31 | static struct omap2_mcspi_device_config ads7846_mcspi_config = { | |
32 | .turbo_mode = 0, | |
33 | .single_channel = 1, /* 0: slave, 1: master */ | |
34 | }; | |
35 | ||
36 | static struct ads7846_platform_data ads7846_config = { | |
37 | .x_max = 0x0fff, | |
38 | .y_max = 0x0fff, | |
39 | .x_plate_ohms = 180, | |
40 | .pressure_max = 255, | |
41 | .debounce_max = 10, | |
42 | .debounce_tol = 3, | |
43 | .debounce_rep = 1, | |
44 | .gpio_pendown = -EINVAL, | |
45 | .keep_vref_on = 1, | |
46 | }; | |
47 | ||
48 | static struct spi_board_info ads7846_spi_board_info __initdata = { | |
49 | .modalias = "ads7846", | |
50 | .bus_num = -EINVAL, | |
51 | .chip_select = 0, | |
52 | .max_speed_hz = 1500000, | |
53 | .controller_data = &ads7846_mcspi_config, | |
54 | .irq = -EINVAL, | |
55 | .platform_data = &ads7846_config, | |
56 | }; | |
57 | ||
58 | void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce, | |
59 | struct ads7846_platform_data *board_pdata) | |
60 | { | |
61 | struct spi_board_info *spi_bi = &ads7846_spi_board_info; | |
62 | int err; | |
63 | ||
64 | err = gpio_request(gpio_pendown, "TS PenDown"); | |
65 | if (err) { | |
66 | pr_err("Could not obtain gpio for TS PenDown: %d\n", err); | |
67 | return; | |
68 | } | |
69 | ||
70 | gpio_direction_input(gpio_pendown); | |
71 | gpio_export(gpio_pendown, 0); | |
72 | ||
73 | if (gpio_debounce) | |
74 | gpio_set_debounce(gpio_pendown, gpio_debounce); | |
75 | ||
76 | ads7846_config.gpio_pendown = gpio_pendown; | |
77 | ||
78 | spi_bi->bus_num = bus_num; | |
79 | spi_bi->irq = OMAP_GPIO_IRQ(gpio_pendown); | |
80 | ||
81 | if (board_pdata) | |
82 | spi_bi->platform_data = board_pdata; | |
83 | ||
84 | spi_register_board_info(&ads7846_spi_board_info, 1); | |
85 | } |