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3 Commits
a6c4370fc4
...
738d2ffa8e
| Author | SHA1 | Date | |
|---|---|---|---|
| 738d2ffa8e | |||
| 46acdf410e | |||
| e8f5493e5d |
@ -1,10 +1,11 @@
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NAME = counter
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NAME = counter
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obj-m += $(NAME).o
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obj-m += $(NAME).o
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$(NAME)-objs := init.o leds.o ls7366r.o trigger.o
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all: $(NAME).ko $(NAME).dtbo
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all: $(NAME).ko $(NAME).dtbo
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echo Builded Device Tree Overlay and kernel module
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echo Builded Device Tree Overlay and kernel module
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$(NAME).ko: $(NAME).c
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$(NAME).ko: init.c leds.c ls7366r.c trigger.c
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make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
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make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
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$(NAME).dtbo: $(NAME).dts
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$(NAME).dtbo: $(NAME).dts
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359
driver/counter.c
359
driver/counter.c
@ -1,359 +0,0 @@
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mod_devicetable.h>
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#include <linux/property.h>
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#include <linux/platform_device.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/spi/spi.h>
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#include <linux/interrupt.h>
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#include <linux/of_irq.h>
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#include <linux/workqueue.h>
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#include "ls7366r.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Wolfgang Hottgenroth");
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MODULE_DESCRIPTION("A simple LKM to parse the device tree for a specific device and its properties");
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/* leds stuff */
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static int dt_leds_probe(struct platform_device *pdev);
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static void dt_leds_remove(struct platform_device *pdev);
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static struct of_device_id leds_driver_ids[] = {
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{
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.compatible = "hottis,leds",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, leds_driver_ids);
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static struct platform_driver leds_driver = {
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.probe = dt_leds_probe,
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.remove = dt_leds_remove,
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.driver = {
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.name = "leds_device_driver",
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.of_match_table = leds_driver_ids,
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},
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};
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static struct gpio_desc *red_led = NULL;
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static struct gpio_desc *blue_led = NULL;
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static int dt_leds_probe(struct platform_device *pdev) {
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struct device *dev = &pdev->dev;
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printk("counter - leds probing\n");
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if(!device_property_present(dev, "red-led-gpio")) {
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printk("counter - Error! Device property 'red-led-gpio' not found!\n");
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return -1;
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}
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if(!device_property_present(dev, "blue-led-gpio")) {
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printk("counter - Error! Device property 'blue-led-gpio' not found!\n");
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return -1;
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}
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/* Init GPIO */
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red_led = gpiod_get(dev, "red-led", GPIOD_OUT_LOW);
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if(IS_ERR(red_led)) {
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printk("counter - Error! Could not setup the GPIO red-led\n");
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return -1 * IS_ERR(red_led);
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}
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blue_led = gpiod_get(dev, "blue-led", GPIOD_OUT_LOW);
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if(IS_ERR(blue_led)) {
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printk("counter - Error! Could not setup the GPIO blue-led\n");
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return -1 * IS_ERR(blue_led);
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}
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return 0;
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}
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static void dt_leds_remove(struct platform_device *pdev) {
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printk("counter - leds removing\n");
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gpiod_put(red_led);
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gpiod_put(blue_led);
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}
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/* spi stuff */
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static int dt_ls7366r_probe(struct spi_device *client);
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static void dt_ls7366r_remove(struct spi_device *client);
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/* LS7366R functions */
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static int writeCmd(struct spi_device *client, u8 c) {
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u8 buf[1];
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buf[0] = c;
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return spi_write(client, buf, 1);
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}
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static int writeCmdData(struct spi_device *client, u8 c, u8 d) {
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u8 buf[2];
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buf[0] = c;
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buf[1] = d;
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return spi_write(client, buf, 2);
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}
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static int read32(struct spi_device *client, u8 c, u32 *r) {
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u8 tx_buf[5];
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tx_buf[0] = c;
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u8 rx_buf[5];
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struct spi_transfer t = {
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.tx_buf = tx_buf,
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.rx_buf = rx_buf,
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.len = 5,
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};
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int ret = spi_sync_transfer(client, &t, 1);
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if (ret < 0) {
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printk("counter - Error! spi_sync_transfer failed in read32\n");
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return ret;
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}
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*r = ((u32)rx_buf[1] << 24) | ((u32)rx_buf[2] << 16) | ((u32)rx_buf[3] << 8) | ((u32)rx_buf[4]);
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return 0;
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}
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static int read8(struct spi_device *client, u8 c, u8 *r) {
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u8 tx_buf[2];
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tx_buf[0] = c;
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u8 rx_buf[2];
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struct spi_transfer t = {
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.tx_buf = tx_buf,
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.rx_buf = rx_buf,
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.len = 2,
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};
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int ret = spi_sync_transfer(client, &t, 1);
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if (ret < 0) {
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printk("counter - Error! spi_sync_transfer failed in read8\n");
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return ret;
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}
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*r = rx_buf[1];
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return 0;
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}
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static struct of_device_id ls7366r_driver_ids[] = {
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{
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.compatible = "hottis,ls7366r",
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}, {}
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};
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MODULE_DEVICE_TABLE(of, ls7366r_driver_ids);
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static struct spi_device_id ls7366r[] = {
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{ "ls7366r", 0 },
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{},
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};
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MODULE_DEVICE_TABLE(spi, ls7366r);
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static struct spi_driver ls7366r_driver = {
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.probe = dt_ls7366r_probe,
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.remove = dt_ls7366r_remove,
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.id_table = ls7366r,
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.driver = {
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.name = "ls7366r_device_driver",
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.of_match_table = ls7366r_driver_ids,
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},
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};
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static struct spi_device *spi_client;
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static int dt_ls7366r_probe(struct spi_device *client) {
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printk("counter - ls7366r probing\n");
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int ret = spi_setup(client);
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if (ret < 0) {
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printk("counter - Error! Failed to set up the SPI bus\n");
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return ret;
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}
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ret = writeCmd(client, CMD_CLR | REG_STR);
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if (ret < 0) {
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printk("counter - Error! writeCmd 1 failed in probe\n");
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return ret;
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}
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ret = writeCmd(client, CMD_CLR | REG_CNTR);
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if (ret < 0) {
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printk("counter - Error! writeCmd 2 failed in probe\n");
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return ret;
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}
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ret = writeCmdData(client, CMD_WR | REG_MDR0, MDR0_ILO);
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if (ret < 0) {
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printk("counter - Error! writeCmdData failed in probe\n");
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return ret;
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}
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u8 x;
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ret = read8(client, CMD_RD | REG_MDR0, &x);
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if (ret < 0) {
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printk("counter - Error! read8 failed in probe\n");
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return ret;
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}
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if (x != MDR0_ILO) {
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printk("counter - Error! failed to initialize counter\n");
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return -1;
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}
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spi_client = client;
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return 0;
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}
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static void dt_ls7366r_remove(struct spi_device *client) {
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printk("counter - ls7366r removing\n");
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}
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/* interrupt stuff */
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static int dt_interrupt_probe(struct platform_device *pdev);
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static void dt_interrupt_remove(struct platform_device *pdev);
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static struct of_device_id interrupt_driver_ids[] = {
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{
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.compatible = "hottis,intr",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, interrupt_driver_ids);
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static struct platform_driver interrupt_driver = {
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.probe = dt_interrupt_probe,
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.remove = dt_interrupt_remove,
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.driver = {
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.name = "interrupt_device_driver",
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.of_match_table = interrupt_driver_ids,
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},
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};
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static struct gpio_desc *counter_interrupt;
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static int irq_number;
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// workqueue
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struct counter_irq_data {
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struct work_struct work;
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u64 timestamp;
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struct spi_device *client;
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u64 last_timestamp;
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u32 last_value;
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};
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static struct counter_irq_data counter_irq_wq_data;
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static void counter_worker(struct work_struct *work) {
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struct counter_irq_data *data = container_of(work, struct counter_irq_data, work);
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u64 ts = data->timestamp;
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u32 counter_value;
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int ret = read32(data->client, CMD_RD | REG_OTR, &counter_value);
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if (ret < 0) {
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printk("counter - Error! read32 failed in counter_worker\n");
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return;
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}
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if (data->last_value) {
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u32 period = counter_value - data->last_value;
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u64 duration = ts - data->last_timestamp;
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printk("counter - Info! ts = %llu, duration = %llu, period = %u\n", ts, duration, period);
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}
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data->last_value = counter_value;
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data->last_timestamp = ts;
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}
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// ISR
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static irqreturn_t counter_isr(int irq, void *dev_id) {
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counter_irq_wq_data.timestamp = ktime_get();
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schedule_work(&counter_irq_wq_data.work);
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return IRQ_HANDLED;
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}
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static int dt_interrupt_probe(struct platform_device *pdev) {
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struct device *dev = &pdev->dev;
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printk("counter - interrupt probing\n");
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INIT_WORK(&counter_irq_wq_data.work, counter_worker);
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counter_irq_wq_data.client = spi_client;
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counter_irq_wq_data.last_value = 0;
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counter_irq_wq_data.last_timestamp = 0;
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counter_interrupt = gpiod_get(dev, "intr", GPIOD_IN);
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if (IS_ERR(counter_interrupt)) {
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printk("counter - Error! Could not setup the GPIO intr\n");
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return -1 * IS_ERR(counter_interrupt);
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}
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irq_number = gpiod_to_irq(counter_interrupt);
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if (irq_number < 0) {
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printk("counter - Error! Could not map GPIO to IRQ\n");
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gpiod_put(counter_interrupt);
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return irq_number;
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}
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printk("counter - Info! IRQ %d assigned\n", irq_number);
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int ret = request_irq(irq_number, counter_isr,
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IRQF_TRIGGER_RISING, "gpio19_irq", dev);
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if (ret) {
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printk("counter - Error! Could not request IRQ\n");
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gpiod_put(counter_interrupt);
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return ret;
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}
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printk("counter - Info! Interrupt assigned\n");
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return 0;
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}
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static void dt_interrupt_remove(struct platform_device *pdev) {
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printk("counter - interrupt removing\n");
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struct device *dev = &pdev->dev;
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free_irq(irq_number, dev);
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gpiod_put(counter_interrupt);
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}
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/* module loading and unloading */
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static int __init my_init(void) {
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printk("counter - Loading the leds driver...\n");
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if(platform_driver_register(&leds_driver)) {
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printk("dt_gpio - Error! Could not load leds driver\n");
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return -1;
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}
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printk("counter - Loading the ls7366r driver...\n");
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if (spi_register_driver(&ls7366r_driver)) {
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printk("counter - Error! Could not load spi driver\n");
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return -1;
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}
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printk("counter - Loading the interrupt driver...\n");
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if(platform_driver_register(&interrupt_driver)) {
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printk("dt_gpio - Error! Could not load interrupt driver\n");
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return -1;
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}
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printk("counter - red led on\n");
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gpiod_set_value(red_led, 1);
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return 0;
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}
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static void __exit my_exit(void) {
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printk("counter - red led off\n");
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gpiod_set_value(red_led, 0);
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||||||
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printk("counter - Unloading the leds driver...\n");
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platform_driver_unregister(&leds_driver);
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printk("counter - Unloading the ls7366r driver...\n");
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spi_unregister_driver(&ls7366r_driver);
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printk("counter - Unloading the interrupt driver...\n");
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platform_driver_unregister(&interrupt_driver);
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}
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||||||
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||||||
module_init(my_init);
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module_exit(my_exit);
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||||||
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|
||||||
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|
||||||
53
driver/init.c
Normal file
53
driver/init.c
Normal file
@ -0,0 +1,53 @@
|
|||||||
|
#include <linux/module.h>
|
||||||
|
#include <linux/init.h>
|
||||||
|
#include <linux/platform_device.h>
|
||||||
|
#include <linux/spi/spi.h>
|
||||||
|
|
||||||
|
#include "ls7366r.h"
|
||||||
|
#include "trigger.h"
|
||||||
|
#include "leds.h"
|
||||||
|
|
||||||
|
MODULE_LICENSE("GPL");
|
||||||
|
MODULE_AUTHOR("Wolfgang Hottgenroth");
|
||||||
|
MODULE_DESCRIPTION("Driver for the MainsCnt measurement hat");
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
/* module loading and unloading */
|
||||||
|
static int __init my_init(void) {
|
||||||
|
printk("counter - Loading the leds driver...\n");
|
||||||
|
if(platform_driver_register(&leds_driver)) {
|
||||||
|
printk("counter - Error! Could not load leds driver\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
printk("counter - Loading the ls7366r driver...\n");
|
||||||
|
if (spi_register_driver(&ls7366r_driver)) {
|
||||||
|
printk("counter - Error! Could not load spi driver\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
printk("counter - Loading the interrupt driver...\n");
|
||||||
|
if(platform_driver_register(&interrupt_driver)) {
|
||||||
|
printk("counter - Error! Could not load interrupt driver\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void __exit my_exit(void) {
|
||||||
|
printk("counter - Unloading the leds driver...\n");
|
||||||
|
platform_driver_unregister(&leds_driver);
|
||||||
|
|
||||||
|
printk("counter - Unloading the ls7366r driver...\n");
|
||||||
|
spi_unregister_driver(&ls7366r_driver);
|
||||||
|
|
||||||
|
printk("counter - Unloading the interrupt driver...\n");
|
||||||
|
platform_driver_unregister(&interrupt_driver);
|
||||||
|
}
|
||||||
|
|
||||||
|
module_init(my_init);
|
||||||
|
module_exit(my_exit);
|
||||||
|
|
||||||
|
|
||||||
74
driver/leds.c
Normal file
74
driver/leds.c
Normal file
@ -0,0 +1,74 @@
|
|||||||
|
#include <linux/module.h>
|
||||||
|
#include <linux/init.h>
|
||||||
|
#include <linux/mod_devicetable.h>
|
||||||
|
#include <linux/property.h>
|
||||||
|
#include <linux/platform_device.h>
|
||||||
|
#include <linux/of_device.h>
|
||||||
|
#include <linux/gpio/consumer.h>
|
||||||
|
|
||||||
|
|
||||||
|
/* leds stuff */
|
||||||
|
static int dt_leds_probe(struct platform_device *pdev);
|
||||||
|
static void dt_leds_remove(struct platform_device *pdev);
|
||||||
|
|
||||||
|
static struct of_device_id leds_driver_ids[] = {
|
||||||
|
{
|
||||||
|
.compatible = "hottis,leds",
|
||||||
|
},
|
||||||
|
{},
|
||||||
|
};
|
||||||
|
MODULE_DEVICE_TABLE(of, leds_driver_ids);
|
||||||
|
|
||||||
|
struct platform_driver leds_driver = {
|
||||||
|
.probe = dt_leds_probe,
|
||||||
|
.remove = dt_leds_remove,
|
||||||
|
.driver = {
|
||||||
|
.name = "leds_device_driver",
|
||||||
|
.of_match_table = leds_driver_ids,
|
||||||
|
},
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct gpio_desc *red_led = NULL;
|
||||||
|
static struct gpio_desc *blue_led = NULL;
|
||||||
|
|
||||||
|
static int dt_leds_probe(struct platform_device *pdev) {
|
||||||
|
struct device *dev = &pdev->dev;
|
||||||
|
|
||||||
|
printk("counter - leds probing\n");
|
||||||
|
|
||||||
|
if(!device_property_present(dev, "red-led-gpio")) {
|
||||||
|
printk("counter - Error! Device property 'red-led-gpio' not found!\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
if(!device_property_present(dev, "blue-led-gpio")) {
|
||||||
|
printk("counter - Error! Device property 'blue-led-gpio' not found!\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/* Init GPIO */
|
||||||
|
red_led = gpiod_get(dev, "red-led", GPIOD_OUT_LOW);
|
||||||
|
if(IS_ERR(red_led)) {
|
||||||
|
printk("counter - Error! Could not setup the GPIO red-led\n");
|
||||||
|
return -1 * IS_ERR(red_led);
|
||||||
|
}
|
||||||
|
blue_led = gpiod_get(dev, "blue-led", GPIOD_OUT_LOW);
|
||||||
|
if(IS_ERR(blue_led)) {
|
||||||
|
printk("counter - Error! Could not setup the GPIO blue-led\n");
|
||||||
|
return -1 * IS_ERR(blue_led);
|
||||||
|
}
|
||||||
|
|
||||||
|
printk("counter - red led on\n");
|
||||||
|
gpiod_set_value(red_led, 1);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void dt_leds_remove(struct platform_device *pdev) {
|
||||||
|
printk("counter - red led off\n");
|
||||||
|
gpiod_set_value(red_led, 0);
|
||||||
|
|
||||||
|
printk("counter - leds removing\n");
|
||||||
|
gpiod_put(red_led);
|
||||||
|
gpiod_put(blue_led);
|
||||||
|
}
|
||||||
8
driver/leds.h
Normal file
8
driver/leds.h
Normal file
@ -0,0 +1,8 @@
|
|||||||
|
#ifndef _LEDS_H_
|
||||||
|
#define _LEDS_H_
|
||||||
|
|
||||||
|
#include <linux/platform_device.h>
|
||||||
|
|
||||||
|
extern struct platform_driver leds_driver;
|
||||||
|
|
||||||
|
#endif /* _LEDS_H_ */
|
||||||
142
driver/ls7366r.c
Normal file
142
driver/ls7366r.c
Normal file
@ -0,0 +1,142 @@
|
|||||||
|
#include <linux/module.h>
|
||||||
|
#include <linux/init.h>
|
||||||
|
#include <linux/mod_devicetable.h>
|
||||||
|
#include <linux/property.h>
|
||||||
|
#include <linux/platform_device.h>
|
||||||
|
#include <linux/of_device.h>
|
||||||
|
#include <linux/gpio/consumer.h>
|
||||||
|
#include <linux/spi/spi.h>
|
||||||
|
|
||||||
|
#include "ls7366r_registers.h"
|
||||||
|
#include "ls7366r.h"
|
||||||
|
|
||||||
|
|
||||||
|
/* spi stuff */
|
||||||
|
static int dt_ls7366r_probe(struct spi_device *client);
|
||||||
|
static void dt_ls7366r_remove(struct spi_device *client);
|
||||||
|
|
||||||
|
/* LS7366R functions */
|
||||||
|
static int writeCmd(struct spi_device *client, u8 c) {
|
||||||
|
u8 buf[1];
|
||||||
|
buf[0] = c;
|
||||||
|
return spi_write(client, buf, 1);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int writeCmdData(struct spi_device *client, u8 c, u8 d) {
|
||||||
|
u8 buf[2];
|
||||||
|
buf[0] = c;
|
||||||
|
buf[1] = d;
|
||||||
|
return spi_write(client, buf, 2);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int read32(struct spi_device *client, u8 c, u32 *r) {
|
||||||
|
u8 tx_buf[5];
|
||||||
|
tx_buf[0] = c;
|
||||||
|
u8 rx_buf[5];
|
||||||
|
struct spi_transfer t = {
|
||||||
|
.tx_buf = tx_buf,
|
||||||
|
.rx_buf = rx_buf,
|
||||||
|
.len = 5,
|
||||||
|
};
|
||||||
|
int ret = spi_sync_transfer(client, &t, 1);
|
||||||
|
if (ret < 0) {
|
||||||
|
printk("counter - Error! spi_sync_transfer failed in read32\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
*r = ((u32)rx_buf[1] << 24) | ((u32)rx_buf[2] << 16) | ((u32)rx_buf[3] << 8) | ((u32)rx_buf[4]);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int read_otr(struct spi_device *client, u32 *r) {
|
||||||
|
return read32(client, CMD_RD | REG_OTR, r);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int read8(struct spi_device *client, u8 c, u8 *r) {
|
||||||
|
u8 tx_buf[2];
|
||||||
|
tx_buf[0] = c;
|
||||||
|
u8 rx_buf[2];
|
||||||
|
struct spi_transfer t = {
|
||||||
|
.tx_buf = tx_buf,
|
||||||
|
.rx_buf = rx_buf,
|
||||||
|
.len = 2,
|
||||||
|
};
|
||||||
|
int ret = spi_sync_transfer(client, &t, 1);
|
||||||
|
if (ret < 0) {
|
||||||
|
printk("counter - Error! spi_sync_transfer failed in read8\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
*r = rx_buf[1];
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static struct of_device_id ls7366r_driver_ids[] = {
|
||||||
|
{
|
||||||
|
.compatible = "hottis,ls7366r",
|
||||||
|
}, {}
|
||||||
|
};
|
||||||
|
MODULE_DEVICE_TABLE(of, ls7366r_driver_ids);
|
||||||
|
|
||||||
|
static struct spi_device_id ls7366r[] = {
|
||||||
|
{ "ls7366r", 0 },
|
||||||
|
{},
|
||||||
|
};
|
||||||
|
MODULE_DEVICE_TABLE(spi, ls7366r);
|
||||||
|
|
||||||
|
struct spi_driver ls7366r_driver = {
|
||||||
|
.probe = dt_ls7366r_probe,
|
||||||
|
.remove = dt_ls7366r_remove,
|
||||||
|
.id_table = ls7366r,
|
||||||
|
.driver = {
|
||||||
|
.name = "ls7366r_device_driver",
|
||||||
|
.of_match_table = ls7366r_driver_ids,
|
||||||
|
},
|
||||||
|
};
|
||||||
|
|
||||||
|
struct spi_device *ls7366r_spi_client;
|
||||||
|
|
||||||
|
static int dt_ls7366r_probe(struct spi_device *client) {
|
||||||
|
printk("counter - ls7366r probing\n");
|
||||||
|
|
||||||
|
int ret = spi_setup(client);
|
||||||
|
if (ret < 0) {
|
||||||
|
printk("counter - Error! Failed to set up the SPI bus\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = writeCmd(client, CMD_CLR | REG_STR);
|
||||||
|
if (ret < 0) {
|
||||||
|
printk("counter - Error! writeCmd 1 failed in probe\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
ret = writeCmd(client, CMD_CLR | REG_CNTR);
|
||||||
|
if (ret < 0) {
|
||||||
|
printk("counter - Error! writeCmd 2 failed in probe\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
ret = writeCmdData(client, CMD_WR | REG_MDR0, MDR0_ILO);
|
||||||
|
if (ret < 0) {
|
||||||
|
printk("counter - Error! writeCmdData failed in probe\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
u8 x;
|
||||||
|
ret = read8(client, CMD_RD | REG_MDR0, &x);
|
||||||
|
if (ret < 0) {
|
||||||
|
printk("counter - Error! read8 failed in probe\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
if (x != MDR0_ILO) {
|
||||||
|
printk("counter - Error! failed to initialize counter\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
ls7366r_spi_client = client;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void dt_ls7366r_remove(struct spi_device *client) {
|
||||||
|
printk("counter - ls7366r removing\n");
|
||||||
|
}
|
||||||
|
|
||||||
@ -1,53 +1,11 @@
|
|||||||
#ifndef _LS7366R_H_
|
#ifndef _LS7366R_H_
|
||||||
#define _LS7366R_H_
|
#define _LS7366R_H_
|
||||||
|
|
||||||
#define REG_MDR0 0b00001000
|
#include <linux/spi/spi.h>
|
||||||
#define REG_MDR1 0b00010000
|
|
||||||
#define REG_DTR 0b00011000
|
|
||||||
#define REG_CNTR 0b00100000
|
|
||||||
#define REG_OTR 0b00101000
|
|
||||||
#define REG_STR 0b00110000
|
|
||||||
|
|
||||||
#define CMD_CLR 0b00000000
|
extern struct spi_driver ls7366r_driver;
|
||||||
#define CMD_RD 0b01000000
|
extern struct spi_device *ls7366r_spi_client;
|
||||||
#define CMD_WR 0b10000000
|
|
||||||
#define CMD_LOAD 0b11000000
|
|
||||||
|
|
||||||
#define STR_CY 0b10000000
|
int read_otr(struct spi_device *client, u32 *r);
|
||||||
#define STR_BW 0b01000000
|
|
||||||
#define STR_CMP 0b00100000
|
|
||||||
#define STR_IDX 0b00010000
|
|
||||||
#define STR_CEN 0b00001000
|
|
||||||
#define STR_PLS 0b00000100
|
|
||||||
#define STR_UD 0b00000010
|
|
||||||
#define STR_S 0b00000001
|
|
||||||
|
|
||||||
#define MDR0_NOQ 0b00000000
|
|
||||||
#define MDR0_Q1 0b00000001
|
|
||||||
#define MDR0_Q2 0b00000010
|
|
||||||
#define MDR0_Q4 0b00000011
|
|
||||||
#define MDR0_FRC 0b00000000
|
|
||||||
#define MDR0_SCC 0b00000100
|
|
||||||
#define MDR0_RLC 0b00001000
|
|
||||||
#define MDR0_MNC 0b00001100
|
|
||||||
#define MDR0_DI 0b00000000
|
|
||||||
#define MDR0_ILC 0b00010000
|
|
||||||
#define MDR0_IRC 0b00100000
|
|
||||||
#define MDR0_ILO 0b00110000
|
|
||||||
#define MDR0_AI 0b00000000
|
|
||||||
#define MDR0_SI 0b01000000
|
|
||||||
#define MDR0_FC1 0b00000000
|
|
||||||
#define MDR0_FC2 0b10000000
|
|
||||||
|
|
||||||
#define MDR1_4CM 0b00000000
|
|
||||||
#define MDR1_3CM 0b00000001
|
|
||||||
#define MDR1_2CM 0b00000010
|
|
||||||
#define MDR1_1CM 0b00000011
|
|
||||||
#define MDR1_EC 0b00000000
|
|
||||||
#define MDR1_DC 0b00000100
|
|
||||||
#define MDR1_F_IDX 0b00010000
|
|
||||||
#define MDR1_F_CMP 0b00100000
|
|
||||||
#define MDR1_F_BW 0b01000000
|
|
||||||
#define MDR1_F_CY 0b10000000
|
|
||||||
|
|
||||||
#endif /* _LS7366R_H_ */
|
#endif /* _LS7366R_H_ */
|
||||||
|
|||||||
53
driver/ls7366r_registers.h
Normal file
53
driver/ls7366r_registers.h
Normal file
@ -0,0 +1,53 @@
|
|||||||
|
#ifndef _LS7366R_REGISTERS_H_
|
||||||
|
#define _LS7366R_REGISTERS_H_
|
||||||
|
|
||||||
|
#define REG_MDR0 0b00001000
|
||||||
|
#define REG_MDR1 0b00010000
|
||||||
|
#define REG_DTR 0b00011000
|
||||||
|
#define REG_CNTR 0b00100000
|
||||||
|
#define REG_OTR 0b00101000
|
||||||
|
#define REG_STR 0b00110000
|
||||||
|
|
||||||
|
#define CMD_CLR 0b00000000
|
||||||
|
#define CMD_RD 0b01000000
|
||||||
|
#define CMD_WR 0b10000000
|
||||||
|
#define CMD_LOAD 0b11000000
|
||||||
|
|
||||||
|
#define STR_CY 0b10000000
|
||||||
|
#define STR_BW 0b01000000
|
||||||
|
#define STR_CMP 0b00100000
|
||||||
|
#define STR_IDX 0b00010000
|
||||||
|
#define STR_CEN 0b00001000
|
||||||
|
#define STR_PLS 0b00000100
|
||||||
|
#define STR_UD 0b00000010
|
||||||
|
#define STR_S 0b00000001
|
||||||
|
|
||||||
|
#define MDR0_NOQ 0b00000000
|
||||||
|
#define MDR0_Q1 0b00000001
|
||||||
|
#define MDR0_Q2 0b00000010
|
||||||
|
#define MDR0_Q4 0b00000011
|
||||||
|
#define MDR0_FRC 0b00000000
|
||||||
|
#define MDR0_SCC 0b00000100
|
||||||
|
#define MDR0_RLC 0b00001000
|
||||||
|
#define MDR0_MNC 0b00001100
|
||||||
|
#define MDR0_DI 0b00000000
|
||||||
|
#define MDR0_ILC 0b00010000
|
||||||
|
#define MDR0_IRC 0b00100000
|
||||||
|
#define MDR0_ILO 0b00110000
|
||||||
|
#define MDR0_AI 0b00000000
|
||||||
|
#define MDR0_SI 0b01000000
|
||||||
|
#define MDR0_FC1 0b00000000
|
||||||
|
#define MDR0_FC2 0b10000000
|
||||||
|
|
||||||
|
#define MDR1_4CM 0b00000000
|
||||||
|
#define MDR1_3CM 0b00000001
|
||||||
|
#define MDR1_2CM 0b00000010
|
||||||
|
#define MDR1_1CM 0b00000011
|
||||||
|
#define MDR1_EC 0b00000000
|
||||||
|
#define MDR1_DC 0b00000100
|
||||||
|
#define MDR1_F_IDX 0b00010000
|
||||||
|
#define MDR1_F_CMP 0b00100000
|
||||||
|
#define MDR1_F_BW 0b01000000
|
||||||
|
#define MDR1_F_CY 0b10000000
|
||||||
|
|
||||||
|
#endif /* _LS7366R_REGISTERS_H_ */
|
||||||
124
driver/trigger.c
Normal file
124
driver/trigger.c
Normal file
@ -0,0 +1,124 @@
|
|||||||
|
#include <linux/module.h>
|
||||||
|
#include <linux/init.h>
|
||||||
|
#include <linux/mod_devicetable.h>
|
||||||
|
#include <linux/property.h>
|
||||||
|
#include <linux/platform_device.h>
|
||||||
|
#include <linux/of_device.h>
|
||||||
|
#include <linux/gpio/consumer.h>
|
||||||
|
#include <linux/spi/spi.h>
|
||||||
|
#include <linux/interrupt.h>
|
||||||
|
#include <linux/of_irq.h>
|
||||||
|
#include <linux/workqueue.h>
|
||||||
|
|
||||||
|
#include "ls7366r.h"
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
/* interrupt stuff */
|
||||||
|
static int dt_interrupt_probe(struct platform_device *pdev);
|
||||||
|
static void dt_interrupt_remove(struct platform_device *pdev);
|
||||||
|
|
||||||
|
static struct of_device_id interrupt_driver_ids[] = {
|
||||||
|
{
|
||||||
|
.compatible = "hottis,intr",
|
||||||
|
},
|
||||||
|
{},
|
||||||
|
};
|
||||||
|
MODULE_DEVICE_TABLE(of, interrupt_driver_ids);
|
||||||
|
|
||||||
|
struct platform_driver interrupt_driver = {
|
||||||
|
.probe = dt_interrupt_probe,
|
||||||
|
.remove = dt_interrupt_remove,
|
||||||
|
.driver = {
|
||||||
|
.name = "interrupt_device_driver",
|
||||||
|
.of_match_table = interrupt_driver_ids,
|
||||||
|
},
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct gpio_desc *counter_interrupt;
|
||||||
|
static int irq_number;
|
||||||
|
|
||||||
|
// workqueue
|
||||||
|
struct counter_irq_data {
|
||||||
|
struct work_struct work;
|
||||||
|
u64 timestamp;
|
||||||
|
struct spi_device *client;
|
||||||
|
u64 last_timestamp;
|
||||||
|
u32 last_value;
|
||||||
|
};
|
||||||
|
static struct counter_irq_data counter_irq_wq_data;
|
||||||
|
|
||||||
|
static void counter_worker(struct work_struct *work) {
|
||||||
|
struct counter_irq_data *data = container_of(work, struct counter_irq_data, work);
|
||||||
|
u64 ts = data->timestamp;
|
||||||
|
|
||||||
|
u32 counter_value;
|
||||||
|
int ret = read_otr(data->client, &counter_value);
|
||||||
|
|
||||||
|
if (ret < 0) {
|
||||||
|
printk("counter - Error! read32 failed in counter_worker\n");
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (data->last_value) {
|
||||||
|
u32 period = counter_value - data->last_value;
|
||||||
|
u64 duration = ts - data->last_timestamp;
|
||||||
|
printk("counter - Info! ts = %llu, duration = %llu, period = %u\n", ts, duration, period);
|
||||||
|
}
|
||||||
|
data->last_value = counter_value;
|
||||||
|
data->last_timestamp = ts;
|
||||||
|
}
|
||||||
|
|
||||||
|
// ISR
|
||||||
|
static irqreturn_t counter_isr(int irq, void *dev_id) {
|
||||||
|
counter_irq_wq_data.timestamp = ktime_get();
|
||||||
|
schedule_work(&counter_irq_wq_data.work);
|
||||||
|
return IRQ_HANDLED;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int dt_interrupt_probe(struct platform_device *pdev) {
|
||||||
|
struct device *dev = &pdev->dev;
|
||||||
|
|
||||||
|
printk("counter - interrupt probing\n");
|
||||||
|
|
||||||
|
INIT_WORK(&counter_irq_wq_data.work, counter_worker);
|
||||||
|
counter_irq_wq_data.client = ls7366r_spi_client;
|
||||||
|
counter_irq_wq_data.last_value = 0;
|
||||||
|
counter_irq_wq_data.last_timestamp = 0;
|
||||||
|
|
||||||
|
counter_interrupt = gpiod_get(dev, "intr", GPIOD_IN);
|
||||||
|
if (IS_ERR(counter_interrupt)) {
|
||||||
|
printk("counter - Error! Could not setup the GPIO intr\n");
|
||||||
|
return -1 * IS_ERR(counter_interrupt);
|
||||||
|
}
|
||||||
|
|
||||||
|
irq_number = gpiod_to_irq(counter_interrupt);
|
||||||
|
if (irq_number < 0) {
|
||||||
|
printk("counter - Error! Could not map GPIO to IRQ\n");
|
||||||
|
gpiod_put(counter_interrupt);
|
||||||
|
return irq_number;
|
||||||
|
}
|
||||||
|
printk("counter - Info! IRQ %d assigned\n", irq_number);
|
||||||
|
|
||||||
|
int ret = request_irq(irq_number, counter_isr,
|
||||||
|
IRQF_TRIGGER_RISING, "gpio19_irq", dev);
|
||||||
|
if (ret) {
|
||||||
|
printk("counter - Error! Could not request IRQ\n");
|
||||||
|
gpiod_put(counter_interrupt);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
printk("counter - Info! Interrupt assigned\n");
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void dt_interrupt_remove(struct platform_device *pdev) {
|
||||||
|
printk("counter - interrupt removing\n");
|
||||||
|
struct device *dev = &pdev->dev;
|
||||||
|
free_irq(irq_number, dev);
|
||||||
|
gpiod_put(counter_interrupt);
|
||||||
|
}
|
||||||
|
|
||||||
8
driver/trigger.h
Normal file
8
driver/trigger.h
Normal file
@ -0,0 +1,8 @@
|
|||||||
|
#ifndef _TRIGGER_H_
|
||||||
|
#define _TRIGGER_H_
|
||||||
|
|
||||||
|
#include <linux/platform_device.h>
|
||||||
|
|
||||||
|
extern struct platform_driver interrupt_driver;
|
||||||
|
|
||||||
|
#endif /* _TRIGGER_H_ */
|
||||||
Reference in New Issue
Block a user