| Mike Rapoport | 96974a2 | 2011-04-25 01:09:05 +0300 | [diff] [blame^] | 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 | } |