spi working, counter seems to
This commit is contained in:
168
driver/counter.c
168
driver/counter.c
@ -7,19 +7,22 @@
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#include <linux/gpio/consumer.h>
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#include <linux/spi/spi.h>
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/* Meta Information */
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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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/* Declate the probe and remove functions */
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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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}, { /* sentinel */ }
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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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@ -32,41 +35,9 @@ static struct platform_driver leds_driver = {
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},
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};
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/* GPIO variable */
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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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/* 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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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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/**
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* @brief This function is called on loading the driver
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*/
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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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@ -97,15 +68,95 @@ static int dt_leds_probe(struct platform_device *pdev) {
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return 0;
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}
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/**
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* @brief This function is called on unloading the driver
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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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printk("counter - Info! rx_buf: %02x %02x %02x %02x %02x\n", rx_buf[0], rx_buf[1], rx_buf[2], rx_buf[3], rx_buf[4]);
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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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printk("counter - Info! rx_buf: %02x %02x\n", rx_buf[0], rx_buf[1]);
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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 int dt_ls7366r_probe(struct spi_device *client) {
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printk("counter - ls7366r probing\n");
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@ -115,18 +166,48 @@ static int dt_ls7366r_probe(struct spi_device *client) {
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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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printk("counter - Info! x = %02x\n", x);
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u32 y;
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ret = read32(client, CMD_RD | REG_OTR, &y);
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if (ret < 0) {
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printk("counter - Error! read32 failed in probe\n");
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return ret;
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}
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printk("counter - Info! y = %d\n", y);
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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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/**
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* @brief This function is called, when the module is loaded into the kernel
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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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@ -146,9 +227,6 @@ static int __init my_init(void) {
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return 0;
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}
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/**
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* @brief This function is called, when the module is removed from the kernel
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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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@ -29,7 +29,7 @@
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#address-cells = <1>;
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#size-cells = <0>;
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ls7366r: ls7366r0@0 {
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ls7366r: ls7366r@0 {
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compatible = "hottis,ls7366r";
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reg = <0x0>;
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spi-max-frequency = <1000000>;
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53
driver/ls7366r.h
Normal file
53
driver/ls7366r.h
Normal file
@ -0,0 +1,53 @@
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#ifndef _LS7366R_H_
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#define _LS7366R_H_
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#define REG_MDR0 0b00001000
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#define REG_MDR1 0b00010000
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#define REG_DTR 0b00011000
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#define REG_CNTR 0b00100000
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#define REG_OTR 0b00101000
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#define REG_STR 0b00110000
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#define CMD_CLR 0b00000000
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#define CMD_RD 0b01000000
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#define CMD_WR 0b10000000
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#define CMD_LOAD 0b11000000
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#define STR_CY 0b10000000
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#define STR_BW 0b01000000
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#define STR_CMP 0b00100000
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#define STR_IDX 0b00010000
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#define STR_CEN 0b00001000
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#define STR_PLS 0b00000100
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#define STR_UD 0b00000010
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#define STR_S 0b00000001
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#define MDR0_NOQ 0b00000000
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#define MDR0_Q1 0b00000001
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#define MDR0_Q2 0b00000010
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#define MDR0_Q4 0b00000011
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#define MDR0_FRC 0b00000000
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#define MDR0_SCC 0b00000100
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#define MDR0_RLC 0b00001000
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#define MDR0_MNC 0b00001100
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#define MDR0_DI 0b00000000
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#define MDR0_ILC 0b00010000
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#define MDR0_IRC 0b00100000
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#define MDR0_ILO 0b00110000
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#define MDR0_AI 0b00000000
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#define MDR0_SI 0b01000000
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#define MDR0_FC1 0b00000000
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#define MDR0_FC2 0b10000000
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#define MDR1_4CM 0b00000000
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#define MDR1_3CM 0b00000001
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#define MDR1_2CM 0b00000010
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#define MDR1_1CM 0b00000011
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#define MDR1_EC 0b00000000
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#define MDR1_DC 0b00000100
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#define MDR1_F_IDX 0b00010000
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#define MDR1_F_CMP 0b00100000
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#define MDR1_F_BW 0b01000000
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#define MDR1_F_CY 0b10000000
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#endif /* _LS7366R_H_ */
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