diff options
Diffstat (limited to 'package/i2c-gpio-custom/src/i2c-gpio-custom.c')
| -rw-r--r-- | package/i2c-gpio-custom/src/i2c-gpio-custom.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/package/i2c-gpio-custom/src/i2c-gpio-custom.c b/package/i2c-gpio-custom/src/i2c-gpio-custom.c deleted file mode 100644 index 76ab5f39c..000000000 --- a/package/i2c-gpio-custom/src/i2c-gpio-custom.c +++ /dev/null @@ -1,198 +0,0 @@ -/* - * 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/i2c-gpio.h> - -#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]; -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_put(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; - } - - 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_put; - - err = platform_device_add(pdev); - if (err) - goto err_put; - - devices[nr_devices++] = pdev; - return 0; - -err_put: - platform_device_put(pdev); -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); |