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enhance the custom i2c-gpio driver (supports 4 buses from now on), update kernel configuration

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SVN-Revision: 9244
This commit is contained in:
Gabor Juhos 2007-10-10 14:14:34 +00:00
parent 137e963057
commit 2dd2d40b59
4 changed files with 150 additions and 72 deletions
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167
target/linux/adm5120/files/drivers/i2c/busses/i2c-gpio-custom.c
View File

@ -6,6 +6,40 @@
* 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>
@ -16,56 +50,141 @@
#include <linux/i2c-gpio.h>
#define DRV_NAME "i2c-gpio-custom"
#define DRV_DESC "Custom GPIO I2C device driver"
#define DRV_DESC "Custom GPIO-based I2C driver"
#define DRV_VERSION "0.1.0"
static unsigned int sda = CONFIG_I2C_GPIO_CUSTOM_SDA;
static unsigned int scl = CONFIG_I2C_GPIO_CUSTOM_SCL;
static int id = CONFIG_I2C_GPIO_CUSTOM_DEVICE_ID;
#define PFX DRV_NAME ": "
module_param(sda, uint, S_IRUGO);
MODULE_PARM_DESC(sda, "GPIO pin for SDA");
#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
module_param(scl, uint, S_IRUGO);
MODULE_PARM_DESC(scl, "GPIO pin for SCL");
#define BUS_PARAM_REQUIRED 3
#define BUS_PARAM_COUNT 8
#define BUS_COUNT_MAX 4
module_param(id, int, S_IRUGO);
MODULE_PARM_DESC(id, "device id of the i2c-gpio device");
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 struct i2c_gpio_platform_data i2c_data;
static struct platform_device i2c_device;
static unsigned int bus_nump[BUS_COUNT_MAX] __initdata;
static void i2c_gpio_custom_release(struct platform_device *pdev)
#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];
static unsigned int nr_devices;
static void i2c_gpio_custom_cleanup(void)
{
/* nothing to do */
int i;
for (i = 0; i < nr_devices; i++)
if (devices[i])
platform_device_unregister(devices[i]);
}
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 (!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;
}
pdev = platform_device_alloc("i2c-gpio", params[BUS_PARAM_ID]);
if (!pdev) {
err = -ENOMEM;
goto err;
}
devices[nr_devices++] = pdev;
pdata.sda_pin = params[BUS_PARAM_SDA];
pdata.scl_pin = params[BUS_PARAM_SCL];
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;
err = platform_device_register(pdev);
if (err)
goto err;
return 0;
err:
return err;
}
static int __init i2c_gpio_custom_init(void)
{
int err;
i2c_data.sda_pin = sda;
i2c_data.scl_pin = scl;
printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
i2c_device.name = "i2c-gpio";
i2c_device.id = id;
err = i2c_gpio_custom_add_one(0, bus0);
if (err) goto err;
i2c_device.dev.platform_data = &i2c_data,
i2c_device.dev.release = i2c_gpio_custom_release,
err = i2c_gpio_custom_add_one(1, bus1);
if (err) goto err;
err = platform_device_register(&i2c_device);
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;
}
module_init(i2c_gpio_custom_init);
static void __exit i2c_gpio_custom_exit(void)
{
platform_device_unregister(&i2c_device);
i2c_gpio_custom_cleanup();
}
module_init(i2c_gpio_custom_init);
module_exit(i2c_gpio_custom_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org >");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_VERSION(DRV_VERSION);

33
target/linux/adm5120/patches-2.6.22/300-i2c_gpio_custom.patch
View File

@ -1,42 +1,19 @@
--- linux-2.6.22.4.orig/drivers/i2c/busses/Kconfig 2007-08-21 06:33:06.000000000 +0200
+++ linux-2.6.22.4/drivers/i2c/busses/Kconfig 2007-10-09 12:53:13.000000000 +0200
@@ -125,6 +125,40 @@
@@ -125,6 +125,17 @@
This is a very simple bitbanging I2C driver utilizing the
arch-neutral GPIO API to control the SCL and SDA lines.
+config I2C_GPIO_CUSTOM
+ tristate "Custom GPIO-based I2C device"
+ tristate "Custom GPIO-based I2C driver"
+ depends on GENERIC_GPIO
+ select I2C_GPIO
+ help
+ This is an I2C driver to register a custom i2c-gpio device.
+ This is an I2C driver to register 1 to 4 custom I2C buses using
+ GPIO lines.
+
+ This support is also available as a module. If so, the module
+ will be called i2c-gpio-dev.
+
+config I2C_GPIO_CUSTOM_SDA
+ int "Custom GPIO pin for SDA"
+ depends on I2C_GPIO_CUSTOM
+ default "0"
+ help
+ Enter the GPIO pin number used for the SDA signal. This value can
+ also be specified with a module parameter.
+
+config I2C_GPIO_CUSTOM_SCL
+ int "Custom GPIO pin for SCL"
+ depends on I2C_GPIO_CUSTOM
+ default "1"
+ help
+ Enter the GPIO pin number used for the SCL signal. This value can
+ also be specified with a module parameter.
+
+config I2C_GPIO_CUSTOM_DEVICE_ID
+ int "Custom GPIO device id"
+ depends on I2C_GPIO_CUSTOM
+ default "0"
+ help
+ Enter the number used for the device id of the custom i2c-gpio device.
+ This value can also be specified with a module parameter.
+ will be called i2c-gpio-custom.
+
config I2C_HYDRA
tristate "CHRP Apple Hydra Mac I/O I2C interface"

11
target/linux/adm5120/router_be/config-2.6.22
View File

@ -73,15 +73,7 @@ CONFIG_HW_RANDOM=y
CONFIG_HZ=250
# CONFIG_HZ_100 is not set
CONFIG_HZ_250=y
CONFIG_I2C=m
CONFIG_I2C_ALGOBIT=m
CONFIG_I2C_BOARDINFO=y
CONFIG_I2C_CHARDEV=m
CONFIG_I2C_GPIO=m
CONFIG_I2C_GPIO_CUSTOM=m
CONFIG_I2C_GPIO_CUSTOM_DEVICE_ID=0
CONFIG_I2C_GPIO_CUSTOM_SCL=1
CONFIG_I2C_GPIO_CUSTOM_SDA=0
# CONFIG_I2C is not set
# CONFIG_IDE is not set
CONFIG_INET6_XFRM_MODE_ROUTEOPTIMIZATION=m
CONFIG_INITRAMFS_SOURCE=""
@ -196,7 +188,6 @@ CONFIG_PCI_ADM5120=y
CONFIG_RWSEM_GENERIC_SPINLOCK=y
CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
CONFIG_SCSI_WAIT_SCAN=m
# CONFIG_SENSORS_PC87360 is not set
# CONFIG_SERIAL_8250 is not set
# CONFIG_SERIAL_ADM5120 is not set
CONFIG_SERIAL_AMBA_PL010=y

11
target/linux/adm5120/router_le/config-2.6.22
View File

@ -73,15 +73,7 @@ CONFIG_HW_RANDOM=y
CONFIG_HZ=250
# CONFIG_HZ_100 is not set
CONFIG_HZ_250=y
CONFIG_I2C=m
CONFIG_I2C_ALGOBIT=m
CONFIG_I2C_BOARDINFO=y
CONFIG_I2C_CHARDEV=m
CONFIG_I2C_GPIO=m
CONFIG_I2C_GPIO_CUSTOM=m
CONFIG_I2C_GPIO_CUSTOM_DEVICE_ID=0
CONFIG_I2C_GPIO_CUSTOM_SCL=1
CONFIG_I2C_GPIO_CUSTOM_SDA=0
# CONFIG_I2C is not set
# CONFIG_IDE is not set
CONFIG_INET6_XFRM_MODE_ROUTEOPTIMIZATION=m
CONFIG_INITRAMFS_SOURCE=""
@ -206,7 +198,6 @@ CONFIG_PCI_ADM5120=y
CONFIG_RWSEM_GENERIC_SPINLOCK=y
CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
CONFIG_SCSI_WAIT_SCAN=m
# CONFIG_SENSORS_PC87360 is not set
# CONFIG_SERIAL_8250 is not set
# CONFIG_SERIAL_ADM5120 is not set
CONFIG_SERIAL_AMBA_PL010=y