ioc: Add basic structure

all-spi
Markus Koch 2018-08-09 11:27:55 +02:00
parent ffb91b51c3
commit 1bf8b46eb1
5 changed files with 135 additions and 0 deletions

6
ioc/kernel-driver/.gitignore vendored 100644
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*.o
*.ko
*.mod.c
modules.order
Module.symvers
*.pro.user

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obj-m := lw35-ioc.o
KDIR := ~/projects/arm-linux/current
PWD := $(shell pwd)
default: lw35-ioc.ko
lw35-ioc.ko: lw35-ioc.c
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
deploy: lw35-ioc.ko
scp $< markus@opi:/home/markus/lw35-ioc/deploy
clean:
rm -f ./*.o ./*.ko ./*.mod.c modules.order Module.symvers
.phony: deploy clean

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/*
Reading: https://www.kernel.org/doc/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
*/
&spi1 {
status = "okay";
lw35ioc@0 {
compatible = "brother,lw35ioc";
reg = <0x0>;
spi-max-frequency = <2000000>;
pinctrl-names = "default";
pinctrl-0 = <&lw35ioc>;
data-gpios = <&pio 0 7 GPIO_ACTIVE_HIGH>; /* TODO: get real IO num */
interrupt-parent = <&pio>;
interrupts = <52 2>;
};
};
&pio {
lmg6202ulyt_opc: lmg6202ulyt_pins {
pins = "PA7";
function = "gpio_out";
interrupt-controller;
#interrupt-cells = <1>;
};
};

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#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/spi/spi.h>
#include <linux/of_device.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
/*
* irq in general: https://notes.shichao.io/lkd/ch7/
* raspi irqs: http://morethanuser.blogspot.com/2013/04/raspberry-pi-gpio-interrupts-in-kernel.html
* kdoc devtree irq: https://www.kernel.org/doc/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
* GPIOD doc (including irq): https://www.kernel.org/doc/Documentation/gpio/consumer.txt
*/
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Markus Koch");
MODULE_DESCRIPTION("LW35 I/O Controller Driver");
MODULE_VERSION("0.1");
static char *testparam = "param";
module_param(testparam, charp, S_IRUGO);
MODULE_PARM_DESC(testparam, "A test parameter");
static struct of_device_id lw35ioc_dt_ids[] = {
{ .compatible = "brother,lw35", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, lw35ioc_dt_ids);
struct lw35ioc_priv {
struct spi_device *spi;
// USER VARS HERE
};
static int lw35ioc_probe(struct spi_device *spi)
{
struct lw35ioc_priv *priv = NULL;
printk(KERN_INFO "lw35ioc: probe\n");
priv = devm_kzalloc(&spi->dev,
sizeof(struct lw35ioc_priv),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
spi_set_drvdata(spi, priv);
priv->spi = spi;
printk(KERN_INFO "lw35ioc: Loaded driver\n");
return 0;
// Error handlers go here
}
static int lw35ioc_remove(struct spi_device *spi)
{
struct lw35ioc_priv *priv = spi_get_drvdata(spi);
return 0;
}
static struct spi_driver lw35ioc_driver = {
.probe = lw35ioc_probe,
.remove = lw35ioc_remove,
.driver = {
.name = "lw35ioc",
.owner = THIS_MODULE,
.of_match_table = lw35ioc_dt_ids,
},
};
module_spi_driver(lw35ioc_driver);

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TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
INCLUDEPATH += /home/markus/projects/arm-linux/current/include
SOURCES += \
lw35-ioc.c