diff options
Diffstat (limited to 'nuttx/configs/samv71-xult/src/sam_maxtouch.c')
| -rw-r--r-- | nuttx/configs/samv71-xult/src/sam_maxtouch.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/nuttx/configs/samv71-xult/src/sam_maxtouch.c b/nuttx/configs/samv71-xult/src/sam_maxtouch.c new file mode 100644 index 000000000..e1eb8b2a5 --- /dev/null +++ b/nuttx/configs/samv71-xult/src/sam_maxtouch.c @@ -0,0 +1,310 @@ +/************************************************************************************ + * configs/samv7-xult/src/sam_maxtouch.c + * + * Copyright (C) 2015 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ************************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdbool.h> +#include <stdio.h> +#include <debug.h> +#include <assert.h> +#include <errno.h> + +#include <nuttx/spi/spi.h> +#include <nuttx/input/touchscreen.h> +#include <nuttx/input/mxt.h> + +#include "up_arch.h" +#include "sam_gpio.h" +#include "sam_twihs.h" + +#include "samv71-xult.h" + +#ifdef HAVE_MAXTOUCH + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ +/* Configuration ************************************************************/ + +#ifndef CONFIG_SAMV71XULT_MXT_I2CFREQUENCY +# define CONFIG_SAMV71XULT_MXT_I2CFREQUENCY 500000 +#endif + +#ifndef CONFIG_SAMV71XULT_MXT_DEVMINOR +# define CONFIG_SAMV71XULT_MXT_DEVMINOR 0 +#endif + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct sama5d4ek_tscinfo_s +{ + /* Standard maXTouch interface */ + + struct mxt_lower_s lower; + + /* Extensions for the sama5d4ek board */ + + mxt_handler_t handler; + FAR void *arg; +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/* IRQ/PIO access callbacks. These operations all hidden behind + * callbacks to isolate the maXTouch driver from differences in PIO + * interrupt handling by varying boards and MCUs. If possible, + * interrupts should be configured on both rising and falling edges + * so that contact and loss-of-contact events can be detected. + * + * attach - Attach the maXTouch interrupt handler to the PIO interrupt + * enable - Enable or disable the PIO interrupt + * clear - Acknowledge/clear any pending PIO interrupt + */ + +static int mxt_attach(FAR const struct mxt_lower_s *lower, mxt_handler_t isr, + FAR void *arg); +static void mxt_enable(FAR const struct mxt_lower_s *lower, bool enable); +static void mxt_clear(FAR const struct mxt_lower_s *lower); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/* A reference to a structure of this type must be passed to the maXTouch + * driver. This structure provides information about the configuration + * of the maXTouch and provides some board-specific hooks. + * + * Memory for this structure is provided by the caller. It is not copied + * by the driver and is presumed to persist while the driver is active. + */ + +static struct sama5d4ek_tscinfo_s g_mxtinfo = +{ + .lower = + { + .address = MXT_I2C_ADDRESS, + .frequency = CONFIG_SAMV71XULT_MXT_I2CFREQUENCY, + + .attach = mxt_attach, + .enable = mxt_enable, + .clear = mxt_clear, + }, +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * IRQ/PIO access callbacks. These operations all hidden behind + * callbacks to isolate the maXTouch driver from differences in PIO + * interrupt handling by varying boards and MCUs. If possible, + * interrupts should be configured on both rising and falling edges + * so that contact and loss-of-contact events can be detected. + * + * attach - Attach the maXTouch interrupt handler to the PIO interrupt + * enable - Enable or disable the PIO interrupt + * clear - Acknowledge/clear any pending PIO interrupt + * + ****************************************************************************/ + +static int mxt_attach(FAR const struct mxt_lower_s *lower, mxt_handler_t isr, + FAR void *arg) +{ + if (isr) + { + /* Just save the address of the handler and its argument for now. The + * new handler will called via mxt_interrupt() when the interrupt occurs. + */ + + ivdbg("Attaching %p\n", isr); + g_mxtinfo.handler = isr; + g_mxtinfo.arg = arg; + } + else + { + ivdbg("Detaching %p\n", g_mxtinfo.handler); + mxt_enable(lower, false); + g_mxtinfo.handler = NULL; + g_mxtinfo.arg = NULL; + } + + return OK; +} + +static void mxt_enable(FAR const struct mxt_lower_s *lower, bool enable) +{ + /* Enable or disable interrupts */ + + if (enable && g_mxtinfo.handler) + { + sam_gpioirqenable(IRQ_MXT_CHG); + } + else + { + sam_gpioirqdisable(IRQ_MXT_CHG); + } +} + +static void mxt_clear(FAR const struct mxt_lower_s *lower) +{ + /* Does nothing */ +} + +static int mxt_interrupt(int irq, FAR void *context) +{ + /* Just forward the interrupt to the maXTouch driver */ + + if (g_mxtinfo.handler) + { + return g_mxtinfo.handler(&g_mxtinfo.lower, g_mxtinfo.arg); + } + + /* We got an interrupt with no handler. This should not + * happen. + */ + + sam_gpioirqdisable(IRQ_MXT_CHG); + return OK; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: arch_tcinitialize + * + * Description: + * Each board that supports a touchscreen device must provide this function. + * This function is called by application-specific, setup logic to + * configure the touchscreen device. This function will register the driver + * as /dev/inputN where N is the minor device number. + * + * Input Parameters: + * minor - The input device minor number + * + * Returned Value: + * Zero is returned on success. Otherwise, a negated errno value is + * returned to indicate the nature of the failure. + * + ****************************************************************************/ + +int arch_tcinitialize(int minor) +{ + FAR struct i2c_dev_s *i2c; + static bool initialized = false; + int ret; + + idbg("minor %d\n", minor); + DEBUGASSERT(minor == 0); + + /* Have we already initialized? Since we never uninitialize we must prevent + * multiple initializations. This is necessary, for example, when the + * touchscreen example is used as a built-in application in NSH and can be + * called numerous time. It will attempt to initialize each time. + */ + + if (!initialized) + { + /* Configure the maXTouch CHG interrupt pin */ + + (void)sam_configgpio(GPIO_MXT_CHG); + + /* Get an instance of the I2C interface for the touchscreen chip select */ + + i2c = up_i2cinitialize(MXT_TWI_BUS); + if (!i2c) + { + idbg("Failed to initialize I2C%d\n", MXT_TWI_BUS); + return -ENODEV; + } + + /* Configure maXTouch CHG interrupts */ + + sam_gpioirq(GPIO_MXT_CHG); + (void)irq_attach(IRQ_MXT_CHG, mxt_interrupt); + + /* Initialize and register the I2C touchscreen device */ + + ret = mxt_register(i2c, &g_mxtinfo.lower, CONFIG_SAMV71XULT_MXT_DEVMINOR); + if (ret < 0) + { + idbg("ERROR: Failed to register touchscreen device\n"); + irq_detach(IRQ_MXT_CHG); + /* up_i2cuninitialize(i2c); */ + return -ENODEV; + } + + /* Now we are initialized */ + + initialized = true; + } + + return OK; +} + +/**************************************************************************** + * Name: arch_tcuninitialize + * + * Description: + * Each board that supports a touchscreen device must provide this function. + * This function is called by application-specific, setup logic to + * uninitialize the touchscreen device. + * + * Input Parameters: + * None + * + * Returned Value: + * None + * + ****************************************************************************/ + +void arch_tcuninitialize(void) +{ + /* No support for un-initializing the touchscreen maXTouch device. It will + * continue to run and process touch interrupts in the background. + */ +} + +#endif /* HAVE_MAXTOUCH */ |