概述
文章目录
- 前言
- 主题
- 概念:
- 写驱动程序:
- regulator_register() 流程分析:
- regulator_get() 流程：
- 编译测试:
- 测试例
- 平台映射
- 供电_平台驱动
- 用电_consumer
前言
韦东山视频学习总结
主题
概念:
Regulator : 电源芯片, 比如电压转换芯片
Consumer : 消费者,使用电源的部件, Regulator 是给 Consumer 供电的
machine : 单板,上面焊接有 Regulator 和 Consumer
Constraints : 约束, 比如某个电源管理芯片输出的电压范围
Supply : 提供电源的部件, Regulator 就是一个 Supply; Regulator A 可以给 Regulator B 供电, 那么 Regulator B 的 Supply 就是 A
写驱动程序:
// 参考 drivers/regulator/tps6105x-regulator.c
1. regulator:【供给】 -----
注册一个 platform_driver: 在它的 probe 函数里分配、设置、注册一个 regulator |
"设置"里要做的事情: 实现 regulator 的操作, 比如 enable, disable, set_voltage |=》 一对平台设备与驱动
2. machine:【映射关系】 |
注册一个 platform_device: 在它的私有数据里指定 regulator 和 consumer 的对应关系(这个电源芯片给哪一个部件供电) |
指定约束条件(比如电压范围) -----
约束里会指定 consumer 的平台设备名称
3. consumer:【使用】
【直接使用即可】: regulator_get(), regulator_enable(), regulator_disable(), regulator_set_voltage....
regulator_register() 流程分析:
// 分配 regulator_dev
rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
/* set regulator constraints */
set_machine_constraints()
add_regulator_attributes()
/* add consumers devices */
set_consumer_device_supply()
在 regulator_map_list 链表里生成一项 regulator_map: 它里面有 dev_name(consumer 的名字),supply(cosumer 的电源引脚名字)
// 把 regulator_dev 放入 regulator_list
list_add(&rdev->list, ®ulator_list);
/* 生成链表结构如下：
regulator_list 图示：
|-regulator_dev |- 链表
|-regulator_dev >- 包含
|-regulator_dev
|-regulator_dev
|-regulator_dev
|-regulator_dev
。。。
regulator_map_list
|-regulator_map
| >-dev_name： consumer 的名字【即调用的设备名字，如 mylcd 平台设备】
| >-supply： consumer 的电源引脚
| >-regulator: 指向对应的 regulator_dev
|-regulator_map
| >-dev_name： consumer的名字
| >-supply： consumer 的电源引脚
| >-regulator: 指向对应的 regulator_dev
。。。
*/
regulator_get() 流程：
// 完成当前平台设备与电源设备与引脚的绑定，返回一个 regulator 方便控制
regulator_get(当前的平台设备【用于获得 consumer 的名字，即平台名称】，电源引脚名称)
_regulator_get
list_for_each_entry(map, ®ulator_map_list, list)
/* 根据平台名字以及 电源引脚名称，在 regulator_map_list 中查找 */
regulator = create_regulator(【regulator_register 时生成的 regulator_dev】, 【调用此函数的平台设备】, 【电源引用】);
return regulator;
编译测试:
1. make menuconfig
Device Drivers --->
[*] Voltage and Current Regulator Support --->
修改 drivers/video/Makefile把原来的LCD驱动去掉
#obj-$(CONFIG_FB_S3C2410) += lcd_4.3.o
make uImage
2. 编译驱动
3. 使用新内核启动
4. 安装驱动:
测试例
平台映射
/* 参考: archarmmach-omap2board-2430sdp.c
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/core.h>
#include <linux/regulator/machine.h>
/* 分配/设置/注册 regulator_init_data */
#if 0
regulator_consumer_supply:
const char *dev_name; /* consumer 的名字 */
const char *supply; /* consumer 的电源引脚名称 */
#endif
static struct regulator_consumer_supply myregulator_supplies[] = {
REGULATOR_SUPPLY("VCC", "mylcd"), // VCC: 引脚名称
// mylcd: 使用的模块平台驱动的 name
};
static struct regulator_init_data myregulator_init_data = {
.constraints = { // 约束条件
.min_uV = 12000000,
.max_uV = 12000000,
.valid_modes_mask = REGULATOR_MODE_NORMAL,
.valid_ops_mask = REGULATOR_CHANGE_STATUS,
},
.num_consumer_supplies = 1,
.consumer_supplies = myregulator_supplies, // 映射关系表
};
static void myregulator_release(struct device * dev)
{
}
static struct platform_device myregulator_dev = {
.name = "myregulator", // 与 regulator 的平台驱动名字相同，会导致其平台驱动 probe() 调用
.id = -1,
.dev = {
.release = myregulator_release,
.platform_data = &myregulator_init_data,
},
};
static int myregulator_machine_init(void)
{
platform_device_register(&myregulator_dev);
return 0;
}
static void myregulator_machine_exit(void)
{
platform_device_unregister(&myregulator_dev);
}
module_init(myregulator_machine_init);
module_exit(myregulator_machine_exit);
MODULE_LICENSE("GPL v2");
供电_平台驱动
/* 参考: drivers/regulator/tps6105x-regulator.c */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/core.h>
#include <asm/io.h>
static volatile unsigned long *gpbcon;
static volatile unsigned long *gpbdat;
static int myregulator_enable(struct regulator_dev *rdev)
{
*gpbdat |= 1; /* 输出高电平 */
return 0;
}
static int myregulator_disable(struct regulator_dev *rdev)
{
*gpbdat &= ~1; /* 输出低电平 */
return 0;
}
static int myregulator_is_enabled(struct regulator_dev *rdev)
{
if (*gpbdat & 1)
return 1;
else
return 0;
}
static struct regulator_ops myregulator_ops = {
.enable = myregulator_enable,
.disable = myregulator_disable,
.is_enabled = myregulator_is_enabled,
};
static struct regulator_desc myregulator_desc = {
.name = "myregulator",
.ops = &myregulator_ops,
.type = REGULATOR_VOLTAGE,
.id = 0,
.owner = THIS_MODULE,
.n_voltages = 1,
};
static struct regulator_dev *myregulator_dev;
static int myregulator_probe(struct platform_device *pdev)
{
struct regulator_init_data *init_data = dev_get_platdata(&pdev->dev); // 获得 Machine 中添加的数据
gpbcon = ioremap(0x56000010, 8);
gpbdat = gpbcon+1;
*gpbcon &= ~(3); /* GPB0设置为输出引脚 */
*gpbcon |= 1;
/* 分配/设置/注册 regulator */
myregulator_dev = regulator_register(&myregulator_desc, // Regulator 的电源控制
&pdev->dev,
init_data, // 这个是 Machine 中的绑定关系及电源约束
NULL,
NULL);
if (IS_ERR(myregulator_dev)) {
printk("regulator_register error!n");
return -EIO;
}
return 0;
}
static int myregulator_remove(struct platform_device *pdev)
{
regulator_unregister(myregulator_dev);
return 0;
}
struct platform_driver myregulator_drv = {
.probe = myregulator_probe,
.remove = myregulator_remove,
.driver = {
.name = "myregulator",
}
};
static int myregulator_init(void)
{
platform_driver_register(&myregulator_drv);
return 0;
}
static void myregulator_exit(void)
{
platform_driver_unregister(&myregulator_drv);
}
module_init(myregulator_init);
module_exit(myregulator_exit);
MODULE_LICENSE("GPL v2");
用电_consumer
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/wait.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/suspend.h>
#include <linux/pm_runtime.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/div64.h>
#include <asm/mach/map.h>
//#include <asm/arch/regs-lcd.h>
//#include <asm/arch/regs-gpio.h>
//#include <asm/arch/fb.h>
#include <linux/regulator/consumer.h>
static struct platform_device lcd_dev;
static int s3c_lcdfb_setcolreg(unsigned int regno, unsigned int red,
unsigned int green, unsigned int blue,
unsigned int transp, struct fb_info *info);
struct lcd_regs {
unsigned long lcdcon1;
unsigned long lcdcon2;
unsigned long lcdcon3;
unsigned long lcdcon4;
unsigned long lcdcon5;
unsigned long lcdsaddr1;
unsigned long lcdsaddr2;
unsigned long lcdsaddr3;
unsigned long redlut;
unsigned long greenlut;
unsigned long bluelut;
unsigned long reserved[9];
unsigned long dithmode;
unsigned long tpal;
unsigned long lcdintpnd;
unsigned long lcdsrcpnd;
unsigned long lcdintmsk;
unsigned long lpcsel;
};
static int mylcd_open(struct fb_info *info, int user)
{
pm_runtime_get_sync(&lcd_dev.dev);
return 0;
}
static int mylcd_release(struct fb_info *info, int user)
{
pm_runtime_mark_last_busy(&lcd_dev.dev);
pm_runtime_put_sync_autosuspend(&lcd_dev.dev);
return 0;
}
static struct fb_ops s3c_lcdfb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = s3c_lcdfb_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_open = mylcd_open,
.fb_release = mylcd_release,
};
static struct fb_info *s3c_lcd;
//static volatile unsigned long *gpbcon;
//static volatile unsigned long *gpbdat;
static volatile unsigned long *gpccon;
static volatile unsigned long *gpdcon;
static volatile unsigned long *gpgcon;
static volatile struct lcd_regs* lcd_regs;
static u32 pseudo_palette[16];
static struct lcd_regs lcd_regs_backup;
/* from pxafb.c */
static inline unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
static int s3c_lcdfb_setcolreg(unsigned int regno, unsigned int red,
unsigned int green, unsigned int blue,
unsigned int transp, struct fb_info *info)
{
unsigned int val;
if (regno > 16)
return 1;
/* 用red,green,blue三原色构造出val */
val = chan_to_field(red, &info->var.red);
val |= chan_to_field(green, &info->var.green);
val |= chan_to_field(blue, &info->var.blue);
//((u32 *)(info->pseudo_palette))[regno] = val;
pseudo_palette[regno] = val;
return 0;
}
static int lcd_suspend_notifier(struct notifier_block *nb,
unsigned long event,
void *dummy)
{
switch (event) {
case PM_SUSPEND_PREPARE:
printk("lcd suspend notifiler test: PM_SUSPEND_PREPAREn");
return NOTIFY_OK;
case PM_POST_SUSPEND:
printk("lcd suspend notifiler test: PM_POST_SUSPENDn");
return NOTIFY_OK;
default:
return NOTIFY_DONE;
}
}
static struct notifier_block lcd_pm_notif_block = {
.notifier_call = lcd_suspend_notifier,
};
static void lcd_release(struct device * dev)
{
}
static struct platform_device lcd_dev = {
.name = "mylcd",
.id = -1,
.dev = {
.release = lcd_release,
},
};
static struct regulator *myregulator;
static int lcd_probe(struct platform_device *pdev)
{
myregulator = regulator_get(&pdev->dev, "VCC");
if (IS_ERR(myregulator)) {
printk("regulator_get error!n");
return -EIO;
}
regulator_enable(myregulator);
pm_runtime_set_active(&pdev->dev);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
}
static int lcd_remove(struct platform_device *pdev)
{
regulator_put(myregulator);
pm_runtime_disable(&pdev->dev);
return 0;
}
static int lcd_suspend(struct device *dev)
{
int i;
unsigned long *dest = &lcd_regs_backup;
unsigned long *src = lcd_regs;
for (i = 0; i < sizeof(lcd_regs_backup)/sizeof(unsigned long); i++)
{
dest[i] = src[i];
}
lcd_regs->lcdcon1 &= ~(1<<0); /* 关闭LCD本身 */
//*gpbdat &= ~1; /* 关闭背光 */
regulator_disable(myregulator);
return 0;
}
static int lcd_resume(struct device *dev)
{
int i;
unsigned long *dest = lcd_regs;
unsigned long *src = &lcd_regs_backup;
struct clk *clk = clk_get(NULL, "lcd");
clk_enable(clk);
clk_put(clk);
#if 0
for (i = 0; i < sizeof(lcd_regs_backup)/sizeof(unsigned long); i++)
{
dest[i] = src[i];
}
#else
lcd_regs->lcdcon1 = lcd_regs_backup.lcdcon1 & ~1;
lcd_regs->lcdcon2 = lcd_regs_backup.lcdcon2;
lcd_regs->lcdcon3 = lcd_regs_backup.lcdcon3;
lcd_regs->lcdcon4 = lcd_regs_backup.lcdcon4;
lcd_regs->lcdcon5 = lcd_regs_backup.lcdcon5;
lcd_regs->lcdsaddr1 = lcd_regs_backup.lcdsaddr1;
lcd_regs->lcdsaddr2 = lcd_regs_backup.lcdsaddr2;
lcd_regs->lcdsaddr3 = lcd_regs_backup.lcdsaddr3;
#endif
lcd_regs->lcdcon1 |= (1<<0); /* 使能LCD控制器 */
lcd_regs->lcdcon5 |= (1<<3); /* 使能LCD本身 */
//*gpbdat |= 1; /* 输出高电平, 使能背光 */
regulator_enable(myregulator);
return 0;
}
static struct dev_pm_ops lcd_pm = {
.suspend = lcd_suspend,
.resume = lcd_resume,
.runtime_suspend = lcd_suspend,
.runtime_resume = lcd_resume,
};
struct platform_driver lcd_drv = {
.probe = lcd_probe,
.remove = lcd_remove,
.driver = {
.name = "mylcd",
.pm = &lcd_pm,
}
};
static int lcd_init(void)
{
/* 1. 分配一个fb_info */
s3c_lcd = framebuffer_alloc(0, NULL);
/* 2. 设置 */
/* 2.1 设置固定的参数 */
strcpy(s3c_lcd->fix.id, "mylcd");
s3c_lcd->fix.smem_len = 480*272*16/8;
s3c_lcd->fix.type = FB_TYPE_PACKED_PIXELS;
s3c_lcd->fix.visual = FB_VISUAL_TRUECOLOR; /* TFT */
s3c_lcd->fix.line_length = 480*2;
/* 2.2 设置可变的参数 */
s3c_lcd->var.xres = 480;
s3c_lcd->var.yres = 272;
s3c_lcd->var.xres_virtual = 480;
s3c_lcd->var.yres_virtual = 272;
s3c_lcd->var.bits_per_pixel = 16;
/* RGB:565 */
s3c_lcd->var.red.offset = 11;
s3c_lcd->var.red.length = 5;
s3c_lcd->var.green.offset = 5;
s3c_lcd->var.green.length = 6;
s3c_lcd->var.blue.offset = 0;
s3c_lcd->var.blue.length = 5;
s3c_lcd->var.activate = FB_ACTIVATE_NOW;
/* 2.3 设置操作函数 */
s3c_lcd->fbops = &s3c_lcdfb_ops;
/* 2.4 其他的设置 */
s3c_lcd->pseudo_palette = pseudo_palette;
//s3c_lcd->screen_base = ; /* 显存的虚拟地址 */
s3c_lcd->screen_size = 480*272*16/8;
/* 3. 硬件相关的操作 */
/* 3.1 配置GPIO用于LCD */
//gpbcon = ioremap(0x56000010, 8);
//gpbdat = gpbcon+1;
gpccon = ioremap(0x56000020, 4);
gpdcon = ioremap(0x56000030, 4);
gpgcon = ioremap(0x56000060, 4);
*gpccon = 0xaaaaaaaa; /* GPIO管脚用于VD[7:0],LCDVF[2:0],VM,VFRAME,VLINE,VCLK,LEND */
*gpdcon = 0xaaaaaaaa; /* GPIO管脚用于VD[23:8] */
#if 0
*gpbcon &= ~(3); /* GPB0设置为输出引脚 */
*gpbcon |= 1;
*gpbdat &= ~1; /* 输出低电平 */
#endif
*gpgcon |= (3<<8); /* GPG4用作LCD_PWREN */
/* 3.2 根据LCD手册设置LCD控制器, 比如VCLK的频率等 */
lcd_regs = ioremap(0x4D000000, sizeof(struct lcd_regs));
/* bit[17:8]: VCLK = HCLK / [(CLKVAL+1) x 2], LCD手册P14
* 10MHz(100ns) = 100MHz / [(CLKVAL+1) x 2]
* CLKVAL = 4
* bit[6:5]: 0b11, TFT LCD
* bit[4:1]: 0b1100, 16 bpp for TFT
* bit[0] : 0 = Disable the video output and the LCD control signal.
*/
lcd_regs->lcdcon1 = (4<<8) | (3<<5) | (0x0c<<1);
#if 1
/* 垂直方向的时间参数
* bit[31:24]: VBPD, VSYNC之后再过多长时间才能发出第1行数据
* LCD手册 T0-T2-T1=4
* VBPD=3
* bit[23:14]: 多少行, 320, 所以LINEVAL=320-1=319
* bit[13:6] : VFPD, 发出最后一行数据之后，再过多长时间才发出VSYNC
* LCD手册T2-T5=322-320=2, 所以VFPD=2-1=1
* bit[5:0] : VSPW, VSYNC信号的脉冲宽度, LCD手册T1=1, 所以VSPW=1-1=0
*/
lcd_regs->lcdcon2 = (1<<24) | (271<<14) | (1<<6) | (9);
/* 水平方向的时间参数
* bit[25:19]: HBPD, VSYNC之后再过多长时间才能发出第1行数据
* LCD手册 T6-T7-T8=17
* HBPD=16
* bit[18:8]: 多少列, 240, 所以HOZVAL=240-1=239
* bit[7:0] : HFPD, 发出最后一行里最后一个象素数据之后，再过多长时间才发出HSYNC
* LCD手册T8-T11=251-240=11, 所以HFPD=11-1=10
*/
lcd_regs->lcdcon3 = (1<<19) | (479<<8) | (1);
/* 水平方向的同步信号
* bit[7:0] : HSPW, HSYNC信号的脉冲宽度, LCD手册T7=5, 所以HSPW=5-1=4
*/
lcd_regs->lcdcon4 = 40;
#else
lcd_regs->lcdcon2 = S3C2410_LCDCON2_VBPD(5) |
S3C2410_LCDCON2_LINEVAL(319) |
S3C2410_LCDCON2_VFPD(3) |
S3C2410_LCDCON2_VSPW(1);
lcd_regs->lcdcon3 = S3C2410_LCDCON3_HBPD(10) |
S3C2410_LCDCON3_HOZVAL(239) |
S3C2410_LCDCON3_HFPD(1);
lcd_regs->lcdcon4 = S3C2410_LCDCON4_MVAL(13) |
S3C2410_LCDCON4_HSPW(0);
#endif
/* 信号的极性
* bit[11]: 1=565 format
* bit[10]: 0 = The video data is fetched at VCLK falling edge
* bit[9] : 1 = HSYNC信号要反转,即低电平有效
* bit[8] : 1 = VSYNC信号要反转,即低电平有效
* bit[6] : 0 = VDEN不用反转
* bit[3] : 0 = PWREN输出0
* bit[1] : 0 = BSWP
* bit[0] : 1 = HWSWP 2440手册P413
*/
lcd_regs->lcdcon5 = (1<<11) | (0<<10) | (1<<9) | (1<<8) | (1<<0);
/* 3.3 分配显存(framebuffer), 并把地址告诉LCD控制器 */
s3c_lcd->screen_base = dma_alloc_writecombine(NULL, s3c_lcd->fix.smem_len, &s3c_lcd->fix.smem_start, GFP_KERNEL);
lcd_regs->lcdsaddr1 = (s3c_lcd->fix.smem_start >> 1) & ~(3<<30);
lcd_regs->lcdsaddr2 = ((s3c_lcd->fix.smem_start + s3c_lcd->fix.smem_len) >> 1) & 0x1fffff;
lcd_regs->lcdsaddr3 = (480*16/16); /* 一行的长度(单位: 2字节) */
//s3c_lcd->fix.smem_start = xxx; /* 显存的物理地址 */
/* 启动LCD */
lcd_regs->lcdcon1 |= (1<<0); /* 使能LCD控制器 */
lcd_regs->lcdcon5 |= (1<<3); /* 使能LCD本身 */
//*gpbdat |= 1; /* 输出高电平, 使能背光 */
/* 4. 注册 */
register_framebuffer(s3c_lcd);
/* 电源管理 */
register_pm_notifier(&lcd_pm_notif_block);
///
// 用于 regulator 的初始化
platform_device_register(&lcd_dev);
platform_driver_register(&lcd_drv);
return 0;
}
static void lcd_exit(void)
{
unregister_framebuffer(s3c_lcd);
lcd_regs->lcdcon1 &= ~(1<<0); /* 关闭LCD本身 */
//*gpbdat &= ~1; /* 关闭背光 */
dma_free_writecombine(NULL, s3c_lcd->fix.smem_len, s3c_lcd->screen_base, s3c_lcd->fix.smem_start);
iounmap(lcd_regs);
// iounmap(gpbcon);
iounmap(gpccon);
iounmap(gpdcon);
iounmap(gpgcon);
framebuffer_release(s3c_lcd);
unregister_pm_notifier(&lcd_pm_notif_block);
platform_device_unregister(&lcd_dev);
platform_driver_unregister(&lcd_drv);
}
module_init(lcd_init);
module_exit(lcd_exit);
MODULE_LICENSE("GPL");
最后
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