Linux下的IMX6ULL-开发板的第一个APP和驱动实验（三）

#include <linux/module.h> #include <linux/fs.h> #include <linux/io.h> #include <linux/errno.h> #include <linux/miscdevice.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/mutex.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/stat.h> #include <linux/init.h> #include <linux/device.h> #include <linux/tty.h> #include <linux/kmod.h> #include <linux/gfp.h> #include "led_opr.h" struct iomux { volatile unsigned int unnames[23]; volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO00; /* offset 0x5c*/ volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO01; volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO02; volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03; volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO04; volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO05; volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO06; volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO07; volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO08; volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO09; }; struct imx6ull_gpio { volatile unsigned int dr; volatile unsigned int gdir; volatile unsigned int psr; volatile unsigned int icr1; volatile unsigned int icr2; volatile unsigned int imr; volatile unsigned int isr; volatile unsigned int edge_sel; }; /* enable GPIO1,GPIO5 */ static volatile unsigned int *CCM_CCGR1; /* set GPIO5_IO03 as GPIO */ static volatile unsigned int *IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3; static struct iomux *iomux; static struct imx6ull_gpio *gpio1; static struct imx6ull_gpio *gpio5; static int board_demo_led_init (int which) /* 初始化LED, which-哪个LED */ { if (!CCM_CCGR1) { CCM_CCGR1 = ioremap(0x20C406C, 4); IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3 = ioremap(0x2290014, 4); iomux = ioremap(0x20e0000, sizeof(struct iomux)); gpio1 = ioremap(0x209C000, sizeof(struct imx6ull_gpio)); gpio5 = ioremap(0x20AC000, sizeof(struct imx6ull_gpio)); } if (which == 0) { /* 1. enable GPIO5 * CG15, b[31:30] = 0b11 */ *CCM_CCGR1 |= (3<<30); /* 2. set GPIO5_IO03 as GPIO * MUX_MODE, b[3:0] = 0b101 */ *IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3 = 5; /* 3. set GPIO5_IO03 as output * GPIO5 GDIR, b[3] = 0b1 */ gpio5->gdir |= (1<<3); } else if(which == 1) { /* 1. enable GPIO1 * CG13, b[27:26] = 0b11 */ *CCM_CCGR1 |= (3<<26); /* 2. set GPIO1_IO03 as GPIO * MUX_MODE, b[3:0] = 0b101 */ iomux->IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03 = 5; /* 3. set GPIO1_IO03 as output * GPIO1 GDIR, b[3] = 0b1 */ gpio1->gdir |= (1<<3); } else if(which == 2) { /* 1. enable GPIO1 * CG13, b[27:26] = 0b11 */ *CCM_CCGR1 |= (3<<26); /* 2. set GPIO1_IO05 as GPIO * MUX_MODE, b[3:0] = 0b101 */ iomux->IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO05 = 5; /* 3. set GPIO1_IO05 as output * GPIO1 GDIR, b[5] = 0b1 */ gpio1->gdir |= (1<<5); } else if(which == 3) { /* 1. enable GPIO1 * CG13, b[27:26] = 0b11 */ *CCM_CCGR1 |= (3<<26); /* 2. set GPIO1_IO06 as GPIO * MUX_MODE, b[3:0] = 0b101 */ iomux->IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO06 = 5; /* 3. set GPIO1_IO06 as output * GPIO1 GDIR, b[6] = 0b1 */ gpio1->gdir |= (1<<6); } //printk("%s %s line %d, led %d\n", __FILE__, __FUNCTION__, __LINE__, which); return 0; } static int board_demo_led_ctl (int which, char status) /* 控制LED, which-哪个LED, status:1-亮,0-灭 */ { //printk("%s %s line %d, led %d, %s\n", __FILE__, __FUNCTION__, __LINE__, which, status ? "on" : "off"); if (which == 0) { if (status) /* on : output 0 */ gpio5->dr &= ~(1<<3); else /* on : output 1 */ gpio5->dr |= (1<<3); } else if (which == 1) { if (status) /* on : output 0 */ gpio1->dr &= ~(1<<3); else /* on : output 1 */ gpio1->dr |= (1<<3); } else if (which == 2) { if (status) /* on : output 0 */ gpio1->dr &= ~(1<<5); else /* on : output 1 */ gpio1->dr |= (1<<5); } else if (which == 3) { if (status) /* on : output 0 */ gpio1->dr &= ~(1<<6); else /* on : output 1 */ gpio1->dr |= (1<<6); } return 0; } static struct led_operations board_demo_led_opr = { .num = 4, .init = board_demo_led_init, .ctl = board_demo_led_ctl, }; struct led_operations *get_board_led_opr(void) { return &board_demo_led_opr; }