ioc: kernel-driver: Create framework for serdev driver
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2
ioc/kernel-driver/.gitignore
vendored
2
ioc/kernel-driver/.gitignore
vendored
@ -4,3 +4,5 @@
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modules.order
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Module.symvers
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*.pro.user
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.*
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*.a
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@ -1,12 +1,12 @@
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obj-m := lw35-ioc.o
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KDIR := ~/projects/arm-linux/current
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obj-m := lw35ioc.o
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KDIR := ~/projects/linux/opi-current
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PWD := $(shell pwd)
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default: lw35-ioc.ko
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lw35-ioc.ko: lw35-ioc.c
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$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
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default: lw35ioc.ko
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lw35ioc.ko: lw35ioc.c
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$(MAKE) -C $(KDIR) M=$(PWD)
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deploy: lw35-ioc.ko
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scp $< markus@opi:/home/markus/lw35-ioc/deploy
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deploy: lw35ioc.ko
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scp $< markus@opi:/home/markus/projects/lw35/deploy/
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clean:
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rm -f ./*.o ./*.ko ./*.mod.c modules.order Module.symvers
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@ -1,28 +0,0 @@
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/*
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Reading: https://www.kernel.org/doc/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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*/
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&spi1 {
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status = "okay";
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lw35ioc@0 {
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compatible = "brother,lw35ioc";
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reg = <0x0>;
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spi-max-frequency = <2000000>;
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pinctrl-names = "default";
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pinctrl-0 = <&lw35ioc>;
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data-gpios = <&pio 0 7 GPIO_ACTIVE_HIGH>; /* TODO: get real IO num */
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interrupt-parent = <&pio>;
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interrupts = <52 2>;
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};
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};
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&pio {
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lmg6202ulyt_opc: lmg6202ulyt_pins {
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pins = "PA7";
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function = "gpio_out";
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interrupt-controller;
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#interrupt-cells = <1>;
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};
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};
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18
ioc/kernel-driver/device-tree-opi-pc.patch
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18
ioc/kernel-driver/device-tree-opi-pc.patch
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@ -0,0 +1,18 @@
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diff --git a/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts b/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts
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index 5aff8ecc66cb..c8201e79dff3 100644
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--- a/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts
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+++ b/arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts
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@@ -211,9 +211,12 @@
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};
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&uart1 {
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+ status = "okay";
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pinctrl-names = "default";
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pinctrl-0 = <&uart1_pins>;
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- status = "disabled";
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+ lw35ioc@0 {
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+ compatible = "brother,lw35";
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+ };
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};
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&uart2 {
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@ -1,78 +0,0 @@
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/spi/spi.h>
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#include <linux/of_device.h>
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.h>
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/*
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* irq in general: https://notes.shichao.io/lkd/ch7/
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* raspi irqs: http://morethanuser.blogspot.com/2013/04/raspberry-pi-gpio-interrupts-in-kernel.html
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* kdoc devtree irq: https://www.kernel.org/doc/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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* GPIOD doc (including irq): https://www.kernel.org/doc/Documentation/gpio/consumer.txt
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*/
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Markus Koch");
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MODULE_DESCRIPTION("LW35 I/O Controller Driver");
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MODULE_VERSION("0.1");
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static char *testparam = "param";
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module_param(testparam, charp, S_IRUGO);
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MODULE_PARM_DESC(testparam, "A test parameter");
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static struct of_device_id lw35ioc_dt_ids[] = {
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{ .compatible = "brother,lw35", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, lw35ioc_dt_ids);
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struct lw35ioc_priv {
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struct spi_device *spi;
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// USER VARS HERE
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};
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static int lw35ioc_probe(struct spi_device *spi)
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{
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struct lw35ioc_priv *priv = NULL;
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printk(KERN_INFO "lw35ioc: probe\n");
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priv = devm_kzalloc(&spi->dev,
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sizeof(struct lw35ioc_priv),
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GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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spi_set_drvdata(spi, priv);
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priv->spi = spi;
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printk(KERN_INFO "lw35ioc: Loaded driver\n");
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return 0;
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// Error handlers go here
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}
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static int lw35ioc_remove(struct spi_device *spi)
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{
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struct lw35ioc_priv *priv = spi_get_drvdata(spi);
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return 0;
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}
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static struct spi_driver lw35ioc_driver = {
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.probe = lw35ioc_probe,
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.remove = lw35ioc_remove,
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.driver = {
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.name = "lw35ioc",
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.owner = THIS_MODULE,
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.of_match_table = lw35ioc_dt_ids,
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},
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};
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module_spi_driver(lw35ioc_driver);
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102
ioc/kernel-driver/lw35ioc.c
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102
ioc/kernel-driver/lw35ioc.c
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@ -0,0 +1,102 @@
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/serdev.h>
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#include <linux/types.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Markus Koch");
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MODULE_DESCRIPTION("LW-35 I/O Controller Driver");
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MODULE_VERSION("0.1");
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static int debug_level = 0;
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module_param(debug_level, int, 0);
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MODULE_PARM_DESC(debug_level, "Debug level");
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static struct of_device_id lw35ioc_dt_ids[] = {
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{ .compatible = "brother,lw35", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, lw35ioc_dt_ids);
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struct lw35ioc_priv {
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struct serdev_device *serdev;
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// USER VARS HERE
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};
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static int lw35ioc_receive_buf(struct serdev_device *serdev,
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const unsigned char *data,
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size_t count)
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{
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dev_info(&serdev->dev, "RX: %c\n", data[0]);
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return 1; // TODO: return proper value
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}
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static void lw35ioc_write_wakeup(struct serdev_device *serdev)
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{
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dev_info(&serdev->dev, "Write wakeup\n");
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// schedule work here
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}
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static struct serdev_device_ops lw35ioc_serdev_ops = {
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.receive_buf = lw35ioc_receive_buf,
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.write_wakeup = lw35ioc_write_wakeup,
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};
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static int lw35ioc_probe(struct serdev_device *serdev)
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{
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struct lw35ioc_priv *priv = NULL;
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int ret;
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u32 speed = 9600;
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printk(KERN_INFO "lw35ioc: probe\n");
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priv = devm_kzalloc(&serdev->dev,
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sizeof(struct lw35ioc_priv),
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GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->serdev = serdev;
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serdev_device_set_drvdata(serdev, priv);
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serdev_device_set_client_ops(serdev, &lw35ioc_serdev_ops);
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ret = serdev_device_open(serdev);
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if (ret) {
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dev_err(&serdev->dev, "Unable to open device.\n");
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goto fail0;
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}
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speed = serdev_device_set_baudrate(serdev, speed);
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dev_info(&serdev->dev, "Using baudrate: %u\n", speed);
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dev_info(&serdev->dev, "Loaded driver\n");
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return 0;
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fail0:
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return ret;
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}
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static void lw35ioc_remove(struct serdev_device *serdev)
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{
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struct lw35ioc_priv *priv = serdev_device_get_drvdata(serdev);
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dev_info(&serdev->dev, "remove\n");
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return;
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}
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static struct serdev_device_driver lw35ioc_driver = {
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.probe = lw35ioc_probe,
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.remove = lw35ioc_remove,
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.driver = {
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.name = "lw35ioc",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(lw35ioc_dt_ids),
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},
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};
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module_serdev_device_driver(lw35ioc_driver);
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@ -6,4 +6,4 @@ CONFIG -= qt
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INCLUDEPATH += /home/markus/projects/arm-linux/current/include
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SOURCES += \
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lw35-ioc.c
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lw35ioc.c
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