Hi,
I need install kmod-spi-gpio-custom but it does not appear in the config menu (Kernel modules ---> SPI SUPPORT). I have already checked the files all and apparently everything is correct.
How can I solve this problem?
Open */openwrt/package/kernel/spi-gpio-custom/*Makefile.
String.
DEPENDS:=@GPIO_SUPPORT +kmod-spi-bitbang +kmod-spi-gpio +kmod-spi-dev @!LINUX_4_19
Delete @!LINUX_4_19
Config menu ( Kernel modules ---> SPI SUPPORT ---> kmod-spi-gpio-custom ) - OK.
But then the error when compiling the package.
Fixed the issue. Posting the fix for future reference:
# Configuration Details
OpenWRT version: 19.01
Kernel version: 5.4.45
Board: MediaTek MT76x8
Fix:
The existing kmod-spi-gpio-custom package supports only kernel version 4.1x
Step 1:
Remove the dependency on kernel version 4.1x in Makefile
Open */openwrt/package/kernel/spi-gpio-custom/Makefile
In DEPENDS:=@GPIO_SUPPORT +kmod-spi-bitbang +kmod-spi-gpio +kmod-spi-dev @!LINUX_4_1x,
delete @!LINUX_4_1x
Step 2:
Update the source code to support latest kernel
Open */openwrt/package/kernel/spi-gpio-custom/src/spi-gpio-custom.c
Replace the contents of the file from https://github.com/vsiddharthv/spi-gpio-custom/blob/master/spi-gpio-custom.c
Posting the complete code here, to be safe of broken links in the future.
/*
* Custom GPIO-based SPI driver
*
* Copyright (C) 2013 Marco Burato <zmaster.adsl@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Based on i2c-gpio-custom by:
* Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
* ---------------------------------------------------------------------------
*
* The behaviour of this driver can be altered by setting some parameters
* from the insmod command line.
*
* The following parameters are adjustable:
*
* bus0 These four arguments can be arrays of
* bus1 1-8 unsigned integers as follows:
* bus2
* bus3 <id>,<sck>,<mosi>,<miso>,<mode1>,<maxfreq1>,<cs1>,...
*
* where:
*
* <id> ID to used as device_id for the corresponding bus (required)
* <sck> GPIO pin ID to be used for bus SCK (required)
* <mosi> GPIO pin ID to be used for bus MOSI (required*)
* <miso> GPIO pin ID to be used for bus MISO (required*)
* <modeX> Mode configuration for slave X in the bus (required)
* (see /include/linux/spi/spi.h)
* <maxfreqX> Maximum clock frequency in Hz for slave X in the bus (required)
* <csX> GPIO pin ID to be used for slave X CS (required**)
*
* Notes:
* * If a signal is not used (for example there is no MISO) you need
* to set the GPIO pin ID for that signal to an invalid value.
* ** If you only have 1 slave in the bus with no CS, you can omit the
* <cs1> param or set it to an invalid GPIO id to disable it. When
* you have 2 or more slaves, they must all have a valid CS.
*
* If this driver is built into the kernel, you can use the following kernel
* command line parameters, with the same values as the corresponding module
* parameters listed above:
*
* spi-gpio-custom.bus0
* spi-gpio-custom.bus1
* spi-gpio-custom.bus2
* spi-gpio-custom.bus3
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_gpio.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
#include <linux/gpio/machine.h>
#include <asm-generic/gpio.h>
#endif
#define DRV_NAME "spi-gpio-custom"
#define DRV_DESC "Custom GPIO-based SPI driver"
#define DRV_VERSION "0.1"
#define PFX DRV_NAME ": "
#define BUS_PARAM_ID 0
#define BUS_PARAM_SCK 1
#define BUS_PARAM_MOSI 2
#define BUS_PARAM_MISO 3
#define BUS_PARAM_MODE1 4
#define BUS_PARAM_MAXFREQ1 5
#define BUS_PARAM_CS1 6
#define BUS_SLAVE_COUNT_MAX 8
#define BUS_PARAM_REQUIRED 6
#define BUS_PARAM_PER_SLAVE 3
#define BUS_PARAM_COUNT (4+BUS_PARAM_PER_SLAVE*BUS_SLAVE_COUNT_MAX)
#define BUS_COUNT_MAX 4
static unsigned int bus0[BUS_PARAM_COUNT] __initdata;
static unsigned int bus1[BUS_PARAM_COUNT] __initdata;
static unsigned int bus2[BUS_PARAM_COUNT] __initdata;
static unsigned int bus3[BUS_PARAM_COUNT] __initdata;
static unsigned int bus_nump[BUS_COUNT_MAX] __initdata;
#define BUS_PARM_DESC \
" config -> id,sck,mosi,miso,mode1,maxfreq1[,cs1,mode2,maxfreq2,cs2,...]"
module_param_array(bus0, uint, &bus_nump[0], 0);
MODULE_PARM_DESC(bus0, "bus0" BUS_PARM_DESC);
module_param_array(bus1, uint, &bus_nump[1], 0);
MODULE_PARM_DESC(bus1, "bus1" BUS_PARM_DESC);
module_param_array(bus2, uint, &bus_nump[2], 0);
MODULE_PARM_DESC(bus2, "bus2" BUS_PARM_DESC);
module_param_array(bus3, uint, &bus_nump[3], 0);
MODULE_PARM_DESC(bus3, "bus3" BUS_PARM_DESC);
static struct platform_device *devices[BUS_COUNT_MAX];
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
#define BUS_NAME_MAX 32
/* NB: BUS_SLAVE_COUNT_MAX #CS entries. */
#define GPIOD_TABLE_TEMPLATE \
{ \
.dev_id=NULL, \
.table={ \
GPIO_LOOKUP(NULL, 0, "sck", GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP(NULL, 0, NULL, GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP(NULL, 0, NULL, GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP_IDX(NULL, 0, NULL, 0, GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP_IDX(NULL, 0, NULL, 1, GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP_IDX(NULL, 0, NULL, 2, GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP_IDX(NULL, 0, NULL, 3, GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP_IDX(NULL, 0, NULL, 4, GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP_IDX(NULL, 0, NULL, 5, GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP_IDX(NULL, 0, NULL, 6, GPIO_ACTIVE_HIGH), \
GPIO_LOOKUP_IDX(NULL, 0, NULL, 7, GPIO_ACTIVE_HIGH), \
{} \
} \
}
static struct gpiod_lookup_table gpiod_table_0=GPIOD_TABLE_TEMPLATE;
static struct gpiod_lookup_table gpiod_table_1=GPIOD_TABLE_TEMPLATE;
static struct gpiod_lookup_table gpiod_table_2=GPIOD_TABLE_TEMPLATE;
static struct gpiod_lookup_table gpiod_table_3=GPIOD_TABLE_TEMPLATE;
#undef GPIOD_TABLE_TEMPLATE
static struct gpiod_lookup_table *gpiod_tables[BUS_COUNT_MAX]={
&gpiod_table_0,
&gpiod_table_1,
&gpiod_table_2,
&gpiod_table_3
};
#endif
static unsigned int nr_devices;
static void spi_gpio_custom_cleanup(void)
{
int i;
for (i = 0; i < nr_devices; i++)
if (devices[i])
platform_device_unregister(devices[i]);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
for (i = 0; i < nr_devices; i++) {
gpiod_remove_lookup_table(gpiod_tables[i]);
kfree(gpiod_tables[i]->dev_id);
}
#endif
}
static int __init spi_gpio_custom_get_slave_mode(unsigned int id,
unsigned int *params,
int slave_index)
{
int param_index;
param_index = BUS_PARAM_MODE1+slave_index*BUS_PARAM_PER_SLAVE;
if (param_index >= bus_nump[id])
return -1;
return params[param_index];
}
static int __init spi_gpio_custom_get_slave_maxfreq(unsigned int id,
unsigned int *params,
int slave_index)
{
int param_index;
param_index = BUS_PARAM_MAXFREQ1+slave_index*BUS_PARAM_PER_SLAVE;
if (param_index >= bus_nump[id])
return -1;
return params[param_index];
}
static int __init spi_gpio_custom_get_slave_cs(unsigned int id,
unsigned int *params,
int slave_index)
{
int param_index;
param_index = BUS_PARAM_CS1+slave_index*BUS_PARAM_PER_SLAVE;
if (param_index >= bus_nump[id])
return -1;
if (!gpio_is_valid(params[param_index]))
return -1;
return params[param_index];
}
static int __init spi_gpio_custom_check_params(unsigned int id, unsigned int *params)
{
int i;
struct spi_master *master;
if (bus_nump[id] < BUS_PARAM_REQUIRED) {
printk(KERN_ERR PFX "not enough values for parameter bus%d\n",
id);
return -EINVAL;
}
if (bus_nump[id] > (1+BUS_PARAM_CS1)) {
/* more than 1 device: check CS GPIOs */
for (i = 0; i < BUS_SLAVE_COUNT_MAX; i++) {
/* no more slaves? */
if (spi_gpio_custom_get_slave_mode(id, params, i) < 0)
break;
if (spi_gpio_custom_get_slave_cs(id, params, i) < 0) {
printk(KERN_ERR PFX "invalid/missing CS gpio for slave %d on bus %d\n",
i, params[BUS_PARAM_ID]);
return -EINVAL;
}
}
}
if (!gpio_is_valid(params[BUS_PARAM_SCK])) {
printk(KERN_ERR PFX "invalid SCK gpio for bus %d\n",
params[BUS_PARAM_ID]);
return -EINVAL;
}
master = spi_busnum_to_master(params[BUS_PARAM_ID]);
if (master) {
spi_master_put(master);
printk(KERN_ERR PFX "bus %d already exists\n",
params[BUS_PARAM_ID]);
return -EEXIST;
}
return 0;
}
static int __init spi_gpio_custom_add_one(unsigned int id, unsigned int *params)
{
struct platform_device *pdev;
struct spi_gpio_platform_data pdata;
int i;
int num_cs;
int err;
struct spi_master *master;
struct spi_device *slave;
struct spi_board_info slave_info;
int mode, maxfreq, cs;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
struct gpiod_lookup_table *gpiod_table;
int cs_gpio;
struct gpio_chip *chip_sck, *chip_mosi, *chip_miso, *chip_cs;
char* dev_id;
#endif
if (!bus_nump[id])
return 0;
err = spi_gpio_custom_check_params(id, params);
if (err)
goto err;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
gpiod_table = gpiod_tables[id];
chip_sck = gpio_to_chip(params[BUS_PARAM_SCK]);
if (!chip_sck) {
printk(KERN_ERR PFX "nonexistent GPIO %d for bus%d SCK\n", params[BUS_PARAM_SCK], id);
err = -EINVAL;
goto err;
}
gpiod_table->table[0].chip_label = chip_sck->label;
gpiod_table->table[0].chip_hwnum = params[BUS_PARAM_SCK] - chip_sck->base;
if (params[BUS_PARAM_MOSI]) {
chip_mosi = gpio_to_chip(params[BUS_PARAM_MOSI]);
if (!chip_mosi) {
printk(KERN_ERR PFX "nonexistent GPIO %d for bus%d MOSI\n", params[BUS_PARAM_MOSI], id);
err = -EINVAL;
goto err;
}
gpiod_table->table[1].chip_label = chip_mosi->label;
gpiod_table->table[1].chip_hwnum = params[BUS_PARAM_MOSI] - chip_mosi->base;
gpiod_table->table[1].con_id = "mosi";
} else {
gpiod_table->table[1].chip_label = "mosi-stub-chip";
gpiod_table->table[1].con_id = "mosi-stub";
}
if (params[BUS_PARAM_MISO]) {
chip_miso = gpio_to_chip(params[BUS_PARAM_MISO]);
if (!chip_miso) {
printk(KERN_ERR PFX "nonexistent GPIO %d for bus%d MISO\n", params[BUS_PARAM_MISO], id);
err = -EINVAL;
goto err;
}
gpiod_table->table[2].chip_label = chip_miso->label;
gpiod_table->table[2].chip_hwnum = params[BUS_PARAM_MISO] - chip_miso->base;
gpiod_table->table[2].con_id = "miso";
} else {
gpiod_table->table[2].chip_label = "miso-stub-chip";
gpiod_table->table[2].con_id = "miso-stub";
}
for (i = 0; i < BUS_SLAVE_COUNT_MAX; i++) {
/* no more slaves? */
if (spi_gpio_custom_get_slave_mode(id, params, i) < 0)
break;
cs_gpio = spi_gpio_custom_get_slave_cs(id, params, i);
if (cs_gpio >= 0) {
chip_cs = gpio_to_chip(cs_gpio);
if (!chip_miso) {
printk(KERN_ERR PFX "nonexistent GPIO %d for bus%d #CS %d\n", cs_gpio, id, i);
err = -EINVAL;
goto err;
}
gpiod_table->table[3 + i].chip_label = chip_cs->label;
gpiod_table->table[3 + i].chip_hwnum = cs_gpio - chip_cs->base;
gpiod_table->table[3 + i].con_id = "cs";
} else {
gpiod_table->table[3 + i].chip_label = "cs-stub-chip";
gpiod_table->table[3 + i].con_id = "cs-stub";
}
}
dev_id = kmalloc(BUS_NAME_MAX+1, GFP_KERNEL);
if (snprintf(dev_id, BUS_NAME_MAX+1, "spi_gpio.%d", params[BUS_PARAM_ID]) >= BUS_NAME_MAX+1) {
printk(KERN_ERR PFX "bus id %d too large\n", id);
err = -EINVAL;
goto err_free;
}
gpiod_table->dev_id = dev_id;
gpiod_add_lookup_table(gpiod_table);
#endif
/* Create BUS device node */
pdev = platform_device_alloc("spi_gpio", params[BUS_PARAM_ID]);
if (!pdev) {
err = -ENOMEM;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
goto err_remove;
#else
goto err;
#endif
}
num_cs = 0;
for (i = 0; i < BUS_SLAVE_COUNT_MAX; i++) {
/* no more slaves? */
if (spi_gpio_custom_get_slave_mode(id, params, i) < 0)
break;
if (spi_gpio_custom_get_slave_cs(id, params, i) >= 0)
num_cs++;
}
if (num_cs == 0) {
/*
* Even if no CS is used, spi modules expect
* at least 1 (unused)
*/
num_cs = 1;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0)
pdata.sck = params[BUS_PARAM_SCK];
pdata.mosi = gpio_is_valid(params[BUS_PARAM_MOSI])
? params[BUS_PARAM_MOSI]
: SPI_GPIO_NO_MOSI;
pdata.miso = gpio_is_valid(params[BUS_PARAM_MISO])
? params[BUS_PARAM_MISO]
: SPI_GPIO_NO_MISO;
#endif
pdata.num_chipselect = num_cs;
err = platform_device_add_data(pdev, &pdata, sizeof(pdata));
if (err) {
platform_device_put(pdev);
goto err;
}
err = platform_device_add(pdev);
if (err) {
printk(KERN_ERR PFX "platform_device_add failed with return code %d\n",
err);
platform_device_put(pdev);
goto err;
}
/* Register SLAVE devices */
for (i = 0; i < BUS_SLAVE_COUNT_MAX; i++) {
mode = spi_gpio_custom_get_slave_mode(id, params, i);
maxfreq = spi_gpio_custom_get_slave_maxfreq(id, params, i);
cs = spi_gpio_custom_get_slave_cs(id, params, i);
/* no more slaves? */
if (mode < 0)
break;
memset(&slave_info, 0, sizeof(slave_info));
strcpy(slave_info.modalias, "spidev");
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0)
slave_info.controller_data = (void *)((cs >= 0)
? cs
: SPI_GPIO_NO_CHIPSELECT);
#endif
slave_info.max_speed_hz = maxfreq;
slave_info.bus_num = params[BUS_PARAM_ID];
slave_info.chip_select = i;
slave_info.mode = mode;
master = spi_busnum_to_master(params[BUS_PARAM_ID]);
if (!master) {
printk(KERN_ERR PFX "unable to get master for bus %d\n",
params[BUS_PARAM_ID]);
err = -EINVAL;
goto err_unregister;
}
slave = spi_new_device(master, &slave_info);
spi_master_put(master);
if (!slave) {
printk(KERN_ERR PFX "unable to create slave %d for bus %d\n",
i, params[BUS_PARAM_ID]);
/* Will most likely fail due to unsupported mode bits */
err = -EINVAL;
goto err_unregister;
}
}
devices[nr_devices++] = pdev;
return 0;
err_unregister:
platform_device_unregister(pdev);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
err_remove:
gpiod_remove_lookup_table(gpiod_table);
err_free:
kfree(dev_id);
#endif
err:
return err;
}
static int __init spi_gpio_custom_probe(void)
{
int err;
printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
err = spi_gpio_custom_add_one(0, bus0);
if (err)
goto err;
err = spi_gpio_custom_add_one(1, bus1);
if (err)
goto err;
err = spi_gpio_custom_add_one(2, bus2);
if (err)
goto err;
err = spi_gpio_custom_add_one(3, bus3);
if (err)
goto err;
if (!nr_devices) {
printk(KERN_ERR PFX "no bus parameter(s) specified\n");
err = -ENODEV;
goto err;
}
return 0;
err:
spi_gpio_custom_cleanup();
return err;
}
#ifdef MODULE
static int __init spi_gpio_custom_init(void)
{
return spi_gpio_custom_probe();
}
module_init(spi_gpio_custom_init);
static void __exit spi_gpio_custom_exit(void)
{
spi_gpio_custom_cleanup();
}
module_exit(spi_gpio_custom_exit);
#else
subsys_initcall(spi_gpio_custom_probe);
#endif /* MODULE*/
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Marco Burato <zmaster.adsl@gmail.com>");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_VERSION(DRV_VERSION);
2 Likes
There is similar issue in case of kmod-i2c-gpio-custom package as well.
Posting solution for it as well:
Step 1:
Remove the dependency on kernel version 4.1x in Makefile
Open */openwrt/package/kernel/i2c-gpio-custom/Makefile
In DEPENDS:=@GPIO_SUPPORT +kmod-i2c-bitbang +kmod-i2c-gpio +kmod-i2c-dev @!LINUX_4_1x ,
delete @!LINUX_4_1x
Step 2:
Update the source code to support latest kernel
Open */openwrt/package/kernel/i2c-gpio-custom/src/i2c-gpio-custom.c
Replace the contents of the file from https://github.com/vsiddharthv/i2c-gpio-custom/blob/master/i2c-gpio-custom.c
Posting the complete code here, to be safe of broken links in the future.
/*
* Custom GPIO-based I2C driver
*
* Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* ---------------------------------------------------------------------------
*
* The behaviour of this driver can be altered by setting some parameters
* from the insmod command line.
*
* The following parameters are adjustable:
*
* bus0 These four arguments can be arrays of
* bus1 1-8 unsigned integers as follows:
* bus2
* bus3 <id>,<sda>,<scl>,<udelay>,<timeout>,<sda_od>,<scl_od>,<scl_oo>
*
* where:
*
* <id> ID to used as device_id for the corresponding bus (required)
* <sda> GPIO pin ID to used for SDA (required)
* <scl> GPIO pin ID to used for SCL (required)
* <udelay> signal toggle delay.
* <timeout> clock stretching timeout.
* <sda_od> SDA is configured as open drain.
* <scl_od> SCL is configured as open drain.
* <scl_oo> SCL output drivers cannot be turned off.
*
* See include/i2c-gpio.h for more information about the parameters.
*
* If this driver is built into the kernel, you can use the following kernel
* command line parameters, with the same values as the corresponding module
* parameters listed above:
*
* i2c-gpio-custom.bus0
* i2c-gpio-custom.bus1
* i2c-gpio-custom.bus2
* i2c-gpio-custom.bus3
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
#include <linux/gpio/machine.h>
#include <asm-generic/gpio.h>
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
#include <linux/i2c-gpio.h>
#else
#include <linux/platform_data/i2c-gpio.h>
#endif
#define DRV_NAME "i2c-gpio-custom"
#define DRV_DESC "Custom GPIO-based I2C driver"
#define DRV_VERSION "0.1.1"
#define PFX DRV_NAME ": "
#define BUS_PARAM_ID 0
#define BUS_PARAM_SDA 1
#define BUS_PARAM_SCL 2
#define BUS_PARAM_UDELAY 3
#define BUS_PARAM_TIMEOUT 4
#define BUS_PARAM_SDA_OD 5
#define BUS_PARAM_SCL_OD 6
#define BUS_PARAM_SCL_OO 7
#define BUS_PARAM_REQUIRED 3
#define BUS_PARAM_COUNT 8
#define BUS_COUNT_MAX 4
static unsigned int bus0[BUS_PARAM_COUNT] __initdata;
static unsigned int bus1[BUS_PARAM_COUNT] __initdata;
static unsigned int bus2[BUS_PARAM_COUNT] __initdata;
static unsigned int bus3[BUS_PARAM_COUNT] __initdata;
static unsigned int bus_nump[BUS_COUNT_MAX] __initdata;
#define BUS_PARM_DESC \
" config -> id,sda,scl[,udelay,timeout,sda_od,scl_od,scl_oo]"
module_param_array(bus0, uint, &bus_nump[0], 0);
MODULE_PARM_DESC(bus0, "bus0" BUS_PARM_DESC);
module_param_array(bus1, uint, &bus_nump[1], 0);
MODULE_PARM_DESC(bus1, "bus1" BUS_PARM_DESC);
module_param_array(bus2, uint, &bus_nump[2], 0);
MODULE_PARM_DESC(bus2, "bus2" BUS_PARM_DESC);
module_param_array(bus3, uint, &bus_nump[3], 0);
MODULE_PARM_DESC(bus3, "bus3" BUS_PARM_DESC);
static struct platform_device *devices[BUS_COUNT_MAX];
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
#define BUS_NAME_MAX 32
#define GPIOD_TABLE_TEMPLATE {.dev_id=NULL, .table={GPIO_LOOKUP(NULL, 0, "sda", GPIO_OPEN_DRAIN), GPIO_LOOKUP(NULL, 0, "scl", GPIO_OPEN_DRAIN), {}}}
static struct gpiod_lookup_table gpiod_table_0=GPIOD_TABLE_TEMPLATE;
static struct gpiod_lookup_table gpiod_table_1=GPIOD_TABLE_TEMPLATE;
static struct gpiod_lookup_table gpiod_table_2=GPIOD_TABLE_TEMPLATE;
static struct gpiod_lookup_table gpiod_table_3=GPIOD_TABLE_TEMPLATE;
#undef GPIOD_TABLE_TEMPLATE
static struct gpiod_lookup_table *gpiod_tables[BUS_COUNT_MAX]={
&gpiod_table_0,
&gpiod_table_1,
&gpiod_table_2,
&gpiod_table_3
};
#endif
static unsigned int nr_devices;
static void i2c_gpio_custom_cleanup(void)
{
int i;
for (i = 0; i < nr_devices; i++)
if (devices[i]) {
platform_device_del(devices[i]);
platform_device_put(devices[i]);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
for (i = 0; i < nr_devices; i++) {
gpiod_remove_lookup_table(gpiod_tables[i]);
kfree(gpiod_tables[i]->dev_id);
}
#endif
}
static int __init i2c_gpio_custom_add_one(unsigned int id, unsigned int *params)
{
struct platform_device *pdev;
struct i2c_gpio_platform_data pdata;
int err;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
struct gpiod_lookup_table *gpiod_table;
struct gpio_chip *chip_sda, *chip_scl;
char* dev_id;
#endif
if (!bus_nump[id])
return 0;
if (bus_nump[id] < BUS_PARAM_REQUIRED) {
printk(KERN_ERR PFX "not enough parameters for bus%d\n", id);
err = -EINVAL;
goto err;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
gpiod_table = gpiod_tables[id];
chip_sda = gpio_to_chip(params[BUS_PARAM_SDA]);
if (!chip_sda) {
printk(KERN_ERR PFX "nonexistent GPIO %d for bus%d SDA\n", params[BUS_PARAM_SDA], id);
err = -EINVAL;
goto err;
}
gpiod_table->table[0].chip_label = chip_sda->label;
gpiod_table->table[0].chip_hwnum = params[BUS_PARAM_SDA] - chip_sda->base;
chip_scl = gpio_to_chip(params[BUS_PARAM_SCL]);
if (!chip_scl) {
printk(KERN_ERR PFX "nonexistent GPIO %d for bus%d SCL\n", params[BUS_PARAM_SCL], id);
err = -EINVAL;
goto err;
}
gpiod_table->table[1].chip_label = chip_scl->label;
gpiod_table->table[1].chip_hwnum = params[BUS_PARAM_SCL] - chip_scl->base;
dev_id = kmalloc(BUS_NAME_MAX+1, GFP_KERNEL);
if (snprintf(dev_id, BUS_NAME_MAX+1, "i2c-gpio.%d", params[BUS_PARAM_ID]) >= BUS_NAME_MAX+1) {
printk(KERN_ERR PFX "bus id %d too large\n", id);
err = -EINVAL;
goto err_free;
}
gpiod_table->dev_id = dev_id;
gpiod_add_lookup_table(gpiod_table);
#endif
pdev = platform_device_alloc("i2c-gpio", params[BUS_PARAM_ID]);
if (!pdev) {
err = -ENOMEM;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
goto err_remove;
#else
goto err;
#endif
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0)
pdata.sda_pin = params[BUS_PARAM_SDA];
pdata.scl_pin = params[BUS_PARAM_SCL];
#endif
pdata.udelay = params[BUS_PARAM_UDELAY];
pdata.timeout = params[BUS_PARAM_TIMEOUT];
pdata.sda_is_open_drain = params[BUS_PARAM_SDA_OD] != 0;
pdata.scl_is_open_drain = params[BUS_PARAM_SCL_OD] != 0;
pdata.scl_is_output_only = params[BUS_PARAM_SCL_OO] != 0;
err = platform_device_add_data(pdev, &pdata, sizeof(pdata));
if (err)
goto err_put;
err = platform_device_add(pdev);
if (err)
goto err_put;
devices[nr_devices++] = pdev;
return 0;
err_put:
platform_device_put(pdev);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
err_remove:
gpiod_remove_lookup_table(gpiod_table);
err_free:
kfree(dev_id);
#endif
err:
return err;
}
static int __init i2c_gpio_custom_probe(void)
{
int err;
printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
err = i2c_gpio_custom_add_one(0, bus0);
if (err)
goto err;
err = i2c_gpio_custom_add_one(1, bus1);
if (err)
goto err;
err = i2c_gpio_custom_add_one(2, bus2);
if (err)
goto err;
err = i2c_gpio_custom_add_one(3, bus3);
if (err)
goto err;
if (!nr_devices) {
printk(KERN_ERR PFX "no bus parameter(s) specified\n");
err = -ENODEV;
goto err;
}
return 0;
err:
i2c_gpio_custom_cleanup();
return err;
}
#ifdef MODULE
static int __init i2c_gpio_custom_init(void)
{
return i2c_gpio_custom_probe();
}
module_init(i2c_gpio_custom_init);
static void __exit i2c_gpio_custom_exit(void)
{
i2c_gpio_custom_cleanup();
}
module_exit(i2c_gpio_custom_exit);
#else
subsys_initcall(i2c_gpio_custom_probe);
#endif /* MODULE*/
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org >");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_VERSION(DRV_VERSION);
Happy programming!
~ Siddharth Velappan
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