arch/arm/mach-omap2/common-board-devices.c

   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/i2c.h>
  24 #include <linux/i2c/twl.h>
  25
  26 #include <linux/gpio.h>
  27 #include <linux/spi/spi.h>
  28 #include <linux/spi/ads7846.h>
  29
  30 #include <plat/i2c.h>
  31 #include <plat/mcspi.h>
  32
  33 #include "common-board-devices.h"
  34
  35 static struct i2c_board_info __initdata pmic_i2c_board_info = {
  36         .addr           = 0x48,
  37         .flags          = I2C_CLIENT_WAKE,
  38 };
  39
  40 void __init omap_pmic_init(int bus, u32 clkrate,
  41                            const char *pmic_type, int pmic_irq,
  42                            struct twl4030_platform_data *pmic_data)
  43 {
  44         strncpy(pmic_i2c_board_info.type, pmic_type,
  45                 sizeof(pmic_i2c_board_info.type));
  46         pmic_i2c_board_info.irq = pmic_irq;
  47         pmic_i2c_board_info.platform_data = pmic_data;
  48
  49         omap_register_i2c_bus(bus, clkrate, &pmic_i2c_board_info, 1);
  50 }
  51
  52 static struct omap2_mcspi_device_config ads7846_mcspi_config = {
  53         .turbo_mode     = 0,
  54         .single_channel = 1,    /* 0: slave, 1: master */
  55 };
  56
  57 static struct ads7846_platform_data ads7846_config = {
  58         .x_max                  = 0x0fff,
  59         .y_max                  = 0x0fff,
  60         .x_plate_ohms           = 180,
  61         .pressure_max           = 255,
  62         .debounce_max           = 10,
  63         .debounce_tol           = 3,
  64         .debounce_rep           = 1,
  65         .gpio_pendown           = -EINVAL,
  66         .keep_vref_on           = 1,
  67 };
  68
  69 static struct spi_board_info ads7846_spi_board_info __initdata = {
  70         .modalias               = "ads7846",
  71         .bus_num                = -EINVAL,
  72         .chip_select            = 0,
  73         .max_speed_hz           = 1500000,
  74         .controller_data        = &ads7846_mcspi_config,
  75         .irq                    = -EINVAL,
  76         .platform_data          = &ads7846_config,
  77 };
  78
  79 void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
  80                               struct ads7846_platform_data *board_pdata)
  81 {
  82         struct spi_board_info *spi_bi = &ads7846_spi_board_info;
  83         int err;
  84
  85         err = gpio_request(gpio_pendown, "TS PenDown");
  86         if (err) {
  87                 pr_err("Could not obtain gpio for TS PenDown: %d\n", err);
  88                 return;
  89         }
  90
  91         gpio_direction_input(gpio_pendown);
  92         gpio_export(gpio_pendown, 0);
  93
  94         if (gpio_debounce)
  95                 gpio_set_debounce(gpio_pendown, gpio_debounce);
  96
  97         ads7846_config.gpio_pendown = gpio_pendown;
  98
  99         spi_bi->bus_num = bus_num;
 100         spi_bi->irq     = OMAP_GPIO_IRQ(gpio_pendown);
 101
 102         if (board_pdata)
 103                 spi_bi->platform_data = board_pdata;
 104
 105         spi_register_board_info(&ads7846_spi_board_info, 1);
 106 }