tiny4412背光驱动，移植到linux-6.1

#include <linux/module.h> #include <linux/kernel.h> #include <linux/cdev.h> #include <linux/device.h> #include <asm/uaccess.h> #include <linux/uaccess.h> #include <linux/platform_device.h> #include <linux/gpio.h> #include <linux/of.h> #include <linux/of_gpio.h> #include <linux/fs.h> #include <linux/bitops.h> #include <linux/clk.h> #include <linux/export.h> #include <linux/err.h> #include <linux/io.h> #include <linux/pwm.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/time.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/irq.h> #include <linux/of_irq.h> #include <linux/of_address.h> #include <linux/of_platform.h> /* PWM 时钟频率 100M 100M / 250 / 4 = 100000 1/100000 = 10us */ static int major; static struct cdev backlight_cdev; static struct class *cls; static struct pinctrl *pctrl; static struct pinctrl_state *pstate_in; static struct pinctrl_state *pstate_out; static int one_write_pin; struct TIMER_BASE { unsigned int TCFG0; unsigned int TCFG1; unsigned int TCON; unsigned int TCNTB0; unsigned int TCMPB0; unsigned int TCNTO0; unsigned int TCNTB1; unsigned int TCMPB1; unsigned int TCNTO1; unsigned int TCNTB2; unsigned int TCMPB2; unsigned int TCNTO2; unsigned int TCNTB3; unsigned int TCMPB3; unsigned int TCNTO3; unsigned int TCNTB4; unsigned int TCBTO4; unsigned int TINT_CSTAT; }; volatile static struct TIMER_BASE *timer = NULL; static volatile unsigned int io_bit_count; static volatile unsigned int io_data; enum { IDLE, START, REQUEST, WAITING, RESPONSE, STOPING, } one_wire_status = IDLE; static inline void stop_timer_for_1wire(void) { unsigned long tcon; tcon = timer->TCON; tcon &= ~(1 << 16); timer->TCON = tcon; } static irqreturn_t timer_for_1wire_interrupt(int irq, void *dev_id) { unsigned int tint; tint = timer->TINT_CSTAT; tint |= 0x100; timer->TINT_CSTAT = tint; //printk("timer_for_1wire_interrupt\n"); io_bit_count--; switch (one_wire_status) { case START: if (io_bit_count == 0) { io_bit_count = 16; one_wire_status = REQUEST; } break; case REQUEST: gpio_set_value(one_write_pin, io_data & (1U << 31)); io_data <<= 1; if (io_bit_count == 0) { io_bit_count = 2; one_wire_status = WAITING; } break; case WAITING: if (io_bit_count == 0) { io_bit_count = 32; one_wire_status = RESPONSE; } if (io_bit_count == 1) { pinctrl_select_state(pctrl, pstate_in); gpio_set_value(one_write_pin, 1); } break; case RESPONSE: io_data = (io_data << 1) | gpio_get_value(one_write_pin); if (io_bit_count == 0) { io_bit_count = 2; one_wire_status = STOPING; gpio_set_value(one_write_pin, 1); pinctrl_select_state(pctrl, pstate_out); //one_wire_session_complete(one_wire_request, io_data); } break; case STOPING: if (io_bit_count == 0) { one_wire_status = IDLE; stop_timer_for_1wire(); } break; default: stop_timer_for_1wire(); } return IRQ_HANDLED; } static const unsigned char crc8_tab[] = { 0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D, 0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D, 0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD, 0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD, 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA, 0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A, 0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A, 0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A, 0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4, 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4, 0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44, 0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34, 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63, 0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13, 0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83, 0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3, }; #define crc8_init(crc) ((crc) = 0XACU) #define crc8(crc, v) ( (crc) = crc8_tab[(crc) ^(v)]) static void start_one_wire_session(unsigned char req) { unsigned int tcon; printk("backlight_write\n"); one_wire_status = START; gpio_set_value(one_write_pin, 1); pinctrl_select_state(pctrl, pstate_out); // IDLE to START { unsigned char crc; crc8_init(crc); crc8(crc, req); io_data = (req << 8) + crc; io_data <<= 16; } io_bit_count = 1; pinctrl_select_state(pctrl, pstate_out); timer->TCNTB3 = 650; //init tranfer and start timer tcon = timer->TCON; tcon &= ~(0xF << 16); tcon |= (1 << 17); timer->TCON = tcon; tcon |= (1 << 16); tcon |= (1 << 19); tcon &= ~(1 << 17); timer->TCON = tcon; timer->TINT_CSTAT |= 0x08; gpio_set_value(one_write_pin, 0); } static ssize_t backlight_write(struct file *file, const char __user *buf, size_t count, loff_t *off) { unsigned char reg, ret; ret = copy_from_user(&reg, buf, 1); printk("kernel: reg = %d", reg); //printk("buf = %d", *buf); if (ret < 0) { printk("%s copy_from_user error\n", __func__); } /*if (reg > 127) { reg = 127; } start_one_wire_session(reg + 0x80); */ start_one_wire_session(reg); return 1; } static int backlight_open(struct inode *inode, struct file *file) { printk("backlight_open\n"); return 0; } static int backlight_release(struct inode *inode, struct file *file) { printk("backlight_exit\n"); return 0; } static struct file_operations backlight_fops = { .owner = THIS_MODULE, .open = backlight_open, .release = backlight_release, .write = backlight_write, }; static struct device *dev; static struct clk *base_clk; static struct resource *res, *irq; static int backlight_probe(struct platform_device *pdev) { int ret, irqno; dev_t devid; dev = &pdev->dev; struct device_node *dev_node; printk("enter %s\n", __func__); dev_node = dev->of_node; irqno = of_irq_get(dev_node, 0); printk("of_irq_get No: %d\n", irqno); irqno = irq_of_parse_and_map(dev_node,0); printk("irq_of_parse_and_map No: %d\n", irqno); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq = res + sizeof(*res); memset(irq, 0, sizeof(*irq)); irq->start = irq->end = irqno; // irq->flags = IORESOURCE_IRQ; // irq->name = of_node_full_name(dev_node); pctrl = devm_pinctrl_get(dev); if (pctrl == NULL) { printk("devm_pinctrl