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device_adc_mcp300x.c
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device_adc_mcp300x.c
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/********************************************************************************
* Copyright (C) 2021 Ju, Gyeong-min
********************************************************************************/
#include "build_cfg.h"
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/delay.h>
#include "indev_type.h"
#include "bcm_peri.h"
#include "gpio_util.h"
#if defined(USE_SPI_DIRECT)
#include "spi_util.h"
#else
#include <linux/spi/spi.h>
#endif
#include "log_util.h"
#include "parse_util.h"
#define MAX_MCP300X_ADC_CHANNEL_COUNT (8)
#define MAX_MCP300X_ADC_VALUE (1023)
// default spi channel
#define MCP300X_DEFAULT_SPI_CHANNEL (0)
typedef struct tag_device_mcp300x_desc_config {
int max_channel_count;
} device_mcp300x_desc_config_t;
typedef struct tag_device_mcp300x_config {
int spi_channel;
int value_weight_percent;
int sampling_count;
} device_mcp300x_config_t;
typedef struct tag_device_mcp300x_index_item {
int adc_channel;
int abs_input;
int min_value;
int max_value;
int min_adc_value;
int max_adc_value;
int mid_adc_value;
} device_mcp300x_index_item_t;
typedef struct tag_device_mcp300x_index_table {
device_mcp300x_index_item_t buttondef[MAX_INPUT_BUTTON_COUNT];
int pin_count;
int button_start_index;
} device_mcp300x_index_table_t;
// device.data에 할당 될 구조체
typedef struct tag_device_mcp300x_data {
int currentAdcValue[MAX_MCP300X_ADC_CHANNEL_COUNT];
device_mcp300x_desc_config_t device_desc_data;
device_mcp300x_config_t device_cfg;
#if !defined(USE_SPI_DIRECT)
struct spi_device* spi;
#endif
device_mcp300x_index_table_t button_cfgs[1];
} device_mcp300x_data_t;
#define INPUT_MCP300X_DEFAULT_KEYCODE_TABLE_ITEM_COUNT (8)
static const device_mcp300x_index_table_t default_input_mcp300x_config = {
{
{0, ABS_X, -DEFAULT_INPUT_ABS_MAX_VALUE, DEFAULT_INPUT_ABS_MAX_VALUE, 0, MAX_MCP300X_ADC_VALUE, MAX_MCP300X_ADC_VALUE/2},
{1, ABS_Y, -DEFAULT_INPUT_ABS_MAX_VALUE, DEFAULT_INPUT_ABS_MAX_VALUE, 0, MAX_MCP300X_ADC_VALUE, MAX_MCP300X_ADC_VALUE/2},
{2, ABS_RX, -DEFAULT_INPUT_ABS_MAX_VALUE, DEFAULT_INPUT_ABS_MAX_VALUE, 0, MAX_MCP300X_ADC_VALUE, MAX_MCP300X_ADC_VALUE/2},
{3, ABS_RY, -DEFAULT_INPUT_ABS_MAX_VALUE, DEFAULT_INPUT_ABS_MAX_VALUE, 0, MAX_MCP300X_ADC_VALUE, MAX_MCP300X_ADC_VALUE/2},
{4, ABS_THROTTLE, -DEFAULT_INPUT_ABS_MAX_VALUE, DEFAULT_INPUT_ABS_MAX_VALUE, 0, MAX_MCP300X_ADC_VALUE, MAX_MCP300X_ADC_VALUE/2},
{5, ABS_WHEEL, -DEFAULT_INPUT_ABS_MAX_VALUE, DEFAULT_INPUT_ABS_MAX_VALUE, 0, MAX_MCP300X_ADC_VALUE, MAX_MCP300X_ADC_VALUE/2},
{6, ABS_HAT0X, -DEFAULT_INPUT_ABS_MAX_VALUE, DEFAULT_INPUT_ABS_MAX_VALUE, 0, MAX_MCP300X_ADC_VALUE, MAX_MCP300X_ADC_VALUE/2},
{7, ABS_HAT0Y, -DEFAULT_INPUT_ABS_MAX_VALUE, DEFAULT_INPUT_ABS_MAX_VALUE, 0, MAX_MCP300X_ADC_VALUE, MAX_MCP300X_ADC_VALUE/2}
},
INPUT_MCP300X_DEFAULT_KEYCODE_TABLE_ITEM_COUNT,
0
};
// device 파라미터 파싱
static int __parse_device_param_for_mcp300x(device_mcp300x_data_t* user_data, char* device_config_str)
{
char szText[512];
char* pText;
if (device_config_str != NULL) {
strcpy(szText, device_config_str);
pText = szText;
user_data->device_cfg.spi_channel = parse_number(&pText, ",", 0, MCP300X_DEFAULT_SPI_CHANNEL);
user_data->device_cfg.value_weight_percent = parse_number(&pText, ",", 10, 100);
user_data->device_cfg.sampling_count = parse_number(&pText, ",", 10, 10);
} else {
user_data->device_cfg.spi_channel = MCP300X_DEFAULT_SPI_CHANNEL;
user_data->device_cfg.value_weight_percent = 100;
user_data->device_cfg.sampling_count = 10;
}
return 0;
}
// 각 endpoint 파라미터 파싱
static int __parse_endpoint_param_for_mcp300x(device_mcp300x_data_t* user_data, char* endpoint_config_str[], input_endpoint_data_t *endpoint_list[], int endpoint_count)
{
int i, j;
int code_mode;
device_mcp300x_index_table_t *src, *des;
char szText[512];
char* pText;
char* temp_p;
des = user_data->button_cfgs;
for (i = 0; i < endpoint_count; i++ ) {
input_endpoint_data_t *ep = endpoint_list[i];
char* cfgtype_p;
int pin_count, button_start_index;
if (ep == NULL) continue;
if (endpoint_config_str[i] != NULL) {
strcpy(szText, endpoint_config_str[i]);
pText = szText;
cfgtype_p = strsep(&pText, ",");
} else {
pText = NULL;
cfgtype_p = NULL;
}
if (cfgtype_p == NULL || strcmp(cfgtype_p, "default") == 0 || strcmp(cfgtype_p, "") == 0){
src = (device_mcp300x_index_table_t *)&default_input_mcp300x_config;
code_mode = INPUT_CODE_TYPE_KEYCODE;
pin_count = parse_number(&pText, ",", 10, src->pin_count);
button_start_index = parse_number(&pText, ",", 10, 0);
} else if (strcmp(cfgtype_p, "custom") == 0){
temp_p = strsep(&pText, ",");
if (temp_p == NULL || strcmp(temp_p, "keycode") == 0 || strcmp(temp_p, "default") == 0 || strcmp(temp_p, "") == 0) {
code_mode = INPUT_CODE_TYPE_KEYCODE;
} else if (strcmp(temp_p, "index") == 0 || strcmp(temp_p, "1") == 0) {
code_mode = INPUT_CODE_TYPE_INDEX;
} else {
code_mode = INPUT_CODE_TYPE_NONE;
}
button_start_index = 0;
pin_count = 0;
src = &user_data->button_cfgs[i];
while (pText != NULL && pin_count < MAX_INPUT_BUTTON_COUNT) {
char *block_p;
int adc_channel, abs_input;
strsep(&pText, "{");
block_p = strsep(&pText, "}");
adc_channel = parse_number(&block_p, ",", 10, -1);
abs_input = parse_number(&block_p, ",", 0, -1);
strsep(&pText, ",");
// 키 설정 추가
if (adc_channel >= 0 && abs_input >= 0 && adc_channel < MAX_MCP300X_ADC_CHANNEL_COUNT) {
src->buttondef[pin_count].adc_channel = adc_channel;
src->buttondef[pin_count].abs_input = abs_input;
src->buttondef[pin_count].min_value = parse_number(&block_p, ",", 10, -DEFAULT_INPUT_ABS_MAX_VALUE);
src->buttondef[pin_count].max_value = parse_number(&block_p, ",", 10, DEFAULT_INPUT_ABS_MAX_VALUE);
src->buttondef[pin_count].min_adc_value = parse_number(&block_p, ",", 10, 0);
src->buttondef[pin_count].max_adc_value = parse_number(&block_p, ",", 10, MAX_MCP300X_ADC_VALUE);
src->buttondef[pin_count].mid_adc_value = parse_number(&block_p, ",", 10, MAX_MCP300X_ADC_VALUE / 2);
pin_count++;
}
}
} else {
continue;
}
if (code_mode == INPUT_CODE_TYPE_KEYCODE) {
for (j = 0; j < pin_count; j++) {
int idx = find_input_button_data(ep, src->buttondef[j].abs_input, NULL);
des->buttondef[j].abs_input = idx;
if (idx != -1) {
des->buttondef[j].adc_channel = src->buttondef[j].adc_channel;
des->buttondef[j].min_value = src->buttondef[j].min_value;
des->buttondef[j].max_value = src->buttondef[j].max_value;
des->buttondef[j].min_adc_value = src->buttondef[j].min_adc_value;
des->buttondef[j].max_adc_value = src->buttondef[j].max_adc_value;
des->buttondef[j].mid_adc_value = src->buttondef[j].mid_adc_value;
}
}
des->pin_count = pin_count;
des->button_start_index = button_start_index;
} else if (code_mode == INPUT_CODE_TYPE_INDEX) {
for (j = 0; j < pin_count; j++) {
des->buttondef[j] = src->buttondef[j];
}
des->pin_count = pin_count;
des->button_start_index = button_start_index;
}
des++;
}
return 0;
}
#if defined(USE_SPI_DIRECT)
static int __mcp300x_spi_read(uint8_t adc_channel)
{
unsigned char buf[3] = {0x01, (0x08 | adc_channel) << 4, 0};
spi_transfern(buf, 3);
return (int)(((unsigned short)buf[1] & 0x3) << 8 | buf[2]);
}
#else
static int __mcp300x_spi_read(struct spi_device *spi, uint8_t adc_channel)
{
unsigned char buf[3] = {0x01, (0x08 | adc_channel) << 4, 0};
struct spi_transfer t = {
.tx_buf = buf,
.rx_buf = buf,
.len = 3,
};
int r = spi_sync_transfer(spi, &t, 1);
return (r >= 0)? (int)(((unsigned short)buf[1] & 0x3) << 8 | buf[2]) : r;
}
#endif
// device_config_str : spi_channel, value_weight_percent, sampling_count
// endpoint_config_str : endpoint, config_type (default | custom), ...
// default: pin_count, start_index
// custom: code_type (0|1), n * {adc_channel, button, min_value, max_value, adc_min_value, adc_max_value, adc_mid_value}
// code_type = 0 : key code
// code_type = 1 : index
//
// ex) device1=mcp300x;0;0,default,12
// device2=mcp300x;;1,custom,,0,{10,0x103,1},{10,0x103,1},{10,0x103,1},{10,0x103,1},{10,0x103,1},{10,0x103,1}
static int init_input_device_for_mcp300x(void* device_desc_data, input_device_data_t *device_data, char* device_config_str, char* endpoint_config_strs[])
{
device_mcp300x_data_t* user_data;
int result;
int i;
user_data = (device_mcp300x_data_t *)kzalloc(sizeof(device_mcp300x_data_t) + sizeof(device_mcp300x_index_table_t) * (device_data->target_endpoint_count - 1), GFP_KERNEL);
user_data->device_desc_data = *(device_mcp300x_desc_config_t *)device_desc_data;
result = __parse_device_param_for_mcp300x(user_data, device_config_str);
if (result != 0) {
kfree(user_data);
return result;
}
result = __parse_endpoint_param_for_mcp300x(user_data, endpoint_config_strs, device_data->target_endpoints, device_data->target_endpoint_count);
if (result != 0) {
kfree(user_data);
return result;
}
for (i = 0; i < MAX_MCP300X_ADC_CHANNEL_COUNT; i++) {
user_data->currentAdcValue[i] = MAX_MCP300X_ADC_VALUE / 2;
}
device_data->data = (void *)user_data;
return 0;
}
static void start_input_device_for_mcp300x(input_device_data_t *device_data)
{
#if !defined(USE_SPI_DIRECT)
device_mcp300x_data_t *user_data = (device_mcp300x_data_t *)device_data->data;
#endif
#if defined(USE_SPI_DIRECT)
spi_init(bcm_peri_base_probe(), 0xB0);
spi_setClockDivider(256);
#else
struct spi_board_info spi_device_info = {
.modalias = "mcp300x",
.max_speed_hz = 1 * 1000 * 1000, // speed your device (slave) can handle
.bus_num = 0, // SPI 0
.chip_select = user_data->device_cfg.spi_channel,
.mode = SPI_MODE_0 // SPI mode 0
};
struct spi_master* master = spi_busnum_to_master(spi_device_info.bus_num);
if (IS_ERR_OR_NULL(master)) {
am_log_err("spi master {%d} not found.", spi_device_info.bus_num);
return;
}
user_data->spi = spi_new_device(master, &spi_device_info);
if (IS_ERR_OR_NULL(user_data->spi)) {
am_log_err("spi open device error {%d}.", user_data->device_cfg.spi_channel);
return;
}
#endif
device_data->is_opend = TRUE;
}
static void check_input_device_for_mcp300x(input_device_data_t *device_data)
{
int i, j, k, cnt;
device_mcp300x_data_t *user_data = (device_mcp300x_data_t *)device_data->data;
int sampling_count, value_weight, prev_weight;
#if !defined(USE_SPI_DIRECT)
struct spi_device* spi;
#endif
if (user_data == NULL) return;
#if defined(USE_SPI_DIRECT)
spi_begin();
spi_chipSelect(user_data->device_cfg.spi_channel);
#else
spi = user_data->spi;
#endif
sampling_count = user_data->device_cfg.sampling_count;
value_weight = user_data->device_cfg.value_weight_percent;
prev_weight = 100 - value_weight;
for (i = 0; i < device_data->target_endpoint_count; i++) {
input_endpoint_data_t* endpoint = device_data->target_endpoints[i];
device_mcp300x_index_table_t* table = &user_data->button_cfgs[i];
device_mcp300x_index_item_t* btndef = &table->buttondef[table->button_start_index];
int v, v0, md;
cnt = table->pin_count;
for (j = 0; j < cnt; j++ ){
if (btndef->abs_input >= 0 && btndef->adc_channel >= 0) {
if (value_weight >= 100) {
#if defined(USE_SPI_DIRECT)
v = __mcp300x_spi_read(btndef->adc_channel);
#else
v = __mcp300x_spi_read(spi, btndef->adc_channel);
#endif
} else {
v = user_data->currentAdcValue[btndef->adc_channel];
for (k = 0; k < sampling_count; k++) {
#if defined(USE_SPI_DIRECT)
v0 = __mcp300x_spi_read(btndef->adc_channel);
#else
v0 = __mcp300x_spi_read(spi, btndef->adc_channel);
#endif
v = (v0 * value_weight + v * prev_weight) / 100;
}
user_data->currentAdcValue[btndef->adc_channel] = v;
}
md = (btndef->max_value - btndef->min_value) / 2;
if( v <= btndef->mid_adc_value ) {
v = btndef->min_value + (v - btndef->min_adc_value) * md / (btndef->mid_adc_value - btndef->min_adc_value);
} else {
v = btndef->min_value + md + (v - btndef->mid_adc_value) * md / (btndef->max_adc_value - btndef->mid_adc_value);
}
endpoint->report_button_state[btndef->abs_input] = v;
}
btndef++;
}
}
#if defined(USE_SPI_DIRECT)
spi_end();
#endif
}
static void stop_input_device_for_mcp300x(input_device_data_t *device_data)
{
#if !defined(USE_SPI_DIRECT)
device_mcp300x_data_t *user_data = (device_mcp300x_data_t *)device_data->data;
#endif
device_data->is_opend = FALSE;
#if defined(USE_SPI_DIRECT)
spi_close();
#else
if (!IS_ERR_OR_NULL(user_data->spi)) {
spi_unregister_device(user_data->spi);
user_data->spi = NULL;
}
#endif
}
int register_input_device_for_mcp3008(input_device_type_desc_t *device_desc)
{
device_mcp300x_desc_config_t* desc = (device_mcp300x_desc_config_t *)device_desc->device_desc_data;
strcpy(device_desc->device_type, "mcp3008");
desc->max_channel_count = 8;
device_desc->init_input_dev = init_input_device_for_mcp300x;
device_desc->start_input_dev = start_input_device_for_mcp300x;
device_desc->check_input_dev = check_input_device_for_mcp300x;
device_desc->stop_input_dev = stop_input_device_for_mcp300x;
return 0;
}
int register_input_device_for_mcp3004(input_device_type_desc_t *device_desc)
{
device_mcp300x_desc_config_t* desc = (device_mcp300x_desc_config_t *)device_desc->device_desc_data;
strcpy(device_desc->device_type, "mcp3004");
desc->max_channel_count = 4;
device_desc->init_input_dev = init_input_device_for_mcp300x;
device_desc->start_input_dev = start_input_device_for_mcp300x;
device_desc->check_input_dev = check_input_device_for_mcp300x;
device_desc->stop_input_dev = stop_input_device_for_mcp300x;
return 0;
}