lfs/kernel_drivers_examples
1
0
Fork 0
mirror of https://github.com/54shady/kernel_drivers_examples.git synced 2025-08-11 23:32:00 +00:00
Code Issues Packages Projects Releases Wiki Activity

I2C : set/get chip data

Browse Source
This commit is contained in:
zeroway
2018-11-30 09:57:45 +08:00
parent 8e569f798e
commit e2bfb94a75
3 changed files with 42 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
debug/i2c/Makefile
View File

@ -3,9 +3,9 @@
# DEBUG = y
# Usage
# make CC=<your_compiler_path> KERNELDIR=<your_kernel_dir>
# make CROSS_COMPILE=<cross_compiler_prefix> KERNEL_DIR=<your_kernel_dir> KERNEL_BUID_OUTPUT=<kernel_buid_output>
#
# make CC=/home/zeroway/3288/src/3288_4.4/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-gcc KERNELDIR=/home/zeroway/3288/src/3288_4.4/kernel
# make CROSS_COMPILE=/home/zeroway/3288/51/src/3288_5.1_v2/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi- KERNEL_DIR=/home/zeroway/3288/51/src/3288_5.1_v2/kernel KERNEL_BUID_OUTPUT=/home/zeroway/3288/51/src/3288_5.1_v2/out/target/product/rk3288/obj/KERNEL
# Add your debugging flag (or not) to CFLAGS
ifeq ($(DEBUG),y)
@ -15,13 +15,15 @@ DEBFLAGS = -O2
endif
obj-m := myi2c.o
obj-m += i2c_regmap.o
KERNELDIR ?= /lib/modules/$(shell uname -r)/build
CC ?= gcc
KERNEL_DIR ?= /lib/modules/$(shell uname -r)/build
KERNEL_BUID_OUTPUT ?=$(KERNEL_DIR)
CC = $(CROSS_COMPILE)gcc
LD = $(CROSS_COMPILE)ld
PWD := $(shell pwd)
modules:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
$(MAKE) -C $(KERNEL_DIR) M=$(PWD) O=$(KERNEL_BUID_OUTPUT) modules
clean:
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions modules.order Module.symvers

42
debug/i2c/myi2c.c
View File

@ -4,20 +4,10 @@
#include <linux/delay.h>
#include <linux/slab.h>
/* describe in device tree */
#if 0
&i2c {
myi2c@36 {
compatible = "myi2c";
status = "okay";
reg = <0x36>;
};
}
#endif
struct myi2c_chip {
char name[20];
struct i2c_client *client;
struct device *dev;
struct device dev;
};
static inline int __myi2c_read(struct i2c_client *client,
@ -32,6 +22,7 @@ static inline int __myi2c_read(struct i2c_client *client,
}
*val = (uint8_t)ret;
return 0;
}
@ -65,8 +56,17 @@ static ssize_t myi2c_debug_show(struct device *dev,
char *buf)
{
uint8_t val;
myi2c_read(dev,myi2c_regs_addr,&val);
return sprintf(buf,"REG[%x]=0x%x\n",myi2c_regs_addr,val);
struct i2c_client *client;
struct myi2c_chip *chip;
/* get chip */
client = container_of(dev, struct i2c_client, dev);
chip = i2c_get_clientdata(client);
printk("chip name = %s\n", chip->name);
myi2c_read(dev, myi2c_regs_addr, &val);
return sprintf(buf, "REG[%x]=0x%x\n", myi2c_regs_addr, val);
}
static ssize_t myi2c_debug_store(struct device *dev,
@ -74,11 +74,20 @@ static ssize_t myi2c_debug_store(struct device *dev,
{
int tmp;
uint8_t val;
struct i2c_client *client;
struct myi2c_chip *chip;
/* get chip */
client = container_of(dev, struct i2c_client, dev);
chip = i2c_get_clientdata(client);
printk("chip name = %s\n", chip->name);
tmp = simple_strtoul(buf, NULL, 16);
/* val = low 8 bit, addr = high 8 bit */
val = tmp & 0x00FF;
myi2c_regs_addr= (tmp >> 8) & 0x00FF;
myi2c_write(dev, myi2c_regs_addr, val);
return count;
}
@ -119,7 +128,7 @@ static int myi2c_probe(struct i2c_client *client,
}
chip->client = client;
chip->dev = &client->dev;
strcpy(chip->name, "I2C_chip");
i2c_set_clientdata(client, chip);
ret = sysfs_create_group(&client->dev.kobj, &myi2c_attr_group);
@ -135,6 +144,7 @@ static int myi2c_probe(struct i2c_client *client,
static int myi2c_remove(struct i2c_client *client)
{
struct myi2c_chip *chip = i2c_get_clientdata(client);
sysfs_remove_group(&client->dev.kobj, &myi2c_attr_group);
kfree(chip);
@ -160,7 +170,9 @@ static struct i2c_driver myi2c_driver = {
static int myi2c_init(void)
{
int ret;
ret = i2c_add_driver(&myi2c_driver);
return ret;
}

7
debug/i2c/myi2c.dtsi Normal file
View File

@ -0,0 +1,7 @@
&i2c0 {
myi2c@36 {
compatible = "myi2c";
status = "okay";
reg = <0x36>;
};
};