+++ /dev/null
-/*
- * Custom GPIO-based PWM driver
- *
- * Based on w1-gpio-custom by Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
- * Copyright (C) 2010 Claudio Mignanti <c.mignanti@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.
- *
- * ---------------------------------------------------------------------------
- *
- * 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 must be arrays
- * bus1
- * .....
- * bus10 <id>,<pin>,<od>
- *
- * where:
- *
- * <id> ID to used as device_id for the corresponding bus (required)
- * <pin> GPIO pin ID for PWM channel (required)
- * *
- * 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:
- *
- * pwm-gpio-custom.bus0
- * pwm-gpio-custom.bus1
- * pwm-gpio-custom.bunN
- * pwm-gpio-custom.bus10
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/workqueue.h>
-
-#include <linux/pwm/pwm.h>
-
-#define DRV_NAME "pwm-gpio-custom"
-#define DRV_DESC "Custom GPIO-based pwm driver"
-#define DRV_VERSION "0.1.0"
-
-#define PFX DRV_NAME ": "
-
-#define BUS_PARAM_ID 0
-#define BUS_PARAM_PIN 1
-
-#define BUS_PARAM_REQUIRED 2
-#define BUS_PARAM_COUNT 2
-#define BUS_COUNT_MAX 10
-
-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 bus4[BUS_PARAM_COUNT] __initdata;
-static unsigned int bus5[BUS_PARAM_COUNT] __initdata;
-static unsigned int bus6[BUS_PARAM_COUNT] __initdata;
-static unsigned int bus7[BUS_PARAM_COUNT] __initdata;
-static unsigned int bus8[BUS_PARAM_COUNT] __initdata;
-static unsigned int bus9[BUS_PARAM_COUNT] __initdata;
-
-static unsigned int bus_nump[BUS_COUNT_MAX] __initdata;
-
-#define BUS_PARM_DESC " config -> id,pin"
-
-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);
-module_param_array(bus4, uint, &bus_nump[4], 0);
-MODULE_PARM_DESC(bus4, "bus4" BUS_PARM_DESC);
-module_param_array(bus5, uint, &bus_nump[5], 0);
-MODULE_PARM_DESC(bus5, "bus5" BUS_PARM_DESC);
-module_param_array(bus6, uint, &bus_nump[6], 0);
-MODULE_PARM_DESC(bus6, "bus6" BUS_PARM_DESC);
-module_param_array(bus7, uint, &bus_nump[7], 0);
-MODULE_PARM_DESC(bus7, "bus7" BUS_PARM_DESC);
-module_param_array(bus8, uint, &bus_nump[8], 0);
-MODULE_PARM_DESC(bus8, "bus8" BUS_PARM_DESC);
-module_param_array(bus9, uint, &bus_nump[9], 0);
-MODULE_PARM_DESC(bus9, "bus9" BUS_PARM_DESC);
-
-static struct platform_device *devices[BUS_COUNT_MAX];
-static unsigned int nr_devices;
-
-static void pwm_gpio_custom_cleanup(void)
-{
- int i;
-
- for (i = 0; i < nr_devices; i++)
- if (devices[i])
- platform_device_put(devices[i]);
-}
-
-static int __init pwm_gpio_custom_add_one(unsigned int id, unsigned int *params)
-{
- struct platform_device *pdev;
- struct gpio_pwm_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("gpio_pwm", params[BUS_PARAM_ID]);
- if (!pdev) {
- err = -ENOMEM;
- goto err;
- }
-
- pdata.gpio = params[BUS_PARAM_PIN];
-
- 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 pwm_gpio_custom_probe(void)
-{
- int err;
-
- nr_devices = 0;
- printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
-
- err = pwm_gpio_custom_add_one(0, bus0);
- if (err) goto err;
-
- err = pwm_gpio_custom_add_one(1, bus1);
- if (err) goto err;
-
- err = pwm_gpio_custom_add_one(2, bus2);
- if (err) goto err;
-
- err = pwm_gpio_custom_add_one(3, bus3);
- if (err) goto err;
-
- err = pwm_gpio_custom_add_one(4, bus4);
- if (err) goto err;
-
- err = pwm_gpio_custom_add_one(5, bus5);
- if (err) goto err;
-
- err = pwm_gpio_custom_add_one(6, bus6);
- if (err) goto err;
-
- err = pwm_gpio_custom_add_one(7, bus7);
- if (err) goto err;
-
- err = pwm_gpio_custom_add_one(8, bus8);
- if (err) goto err;
-
- err = pwm_gpio_custom_add_one(9, bus9);
- if (err) goto err;
-
- if (!nr_devices) {
- printk(KERN_ERR PFX "no bus parameter(s) specified\n");
- err = -ENODEV;
- goto err;
- }
-
- return 0;
-
-err:
- pwm_gpio_custom_cleanup();
- return err;
-}
-
-#ifdef MODULE
-static int __init pwm_gpio_custom_init(void)
-{
- return pwm_gpio_custom_probe();
-}
-module_init(pwm_gpio_custom_init);
-
-static void __exit pwm_gpio_custom_exit(void)
-{
- pwm_gpio_custom_cleanup();
-}
-module_exit(pwm_gpio_custom_exit);
-#else
-subsys_initcall(pwm_gpio_custom_probe);
-#endif /* MODULE*/
-
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Bifferos <bifferos at yahoo.co.uk >");
-MODULE_AUTHOR("Claudio Mignanti <c.mignanti@gmail.com >");
-MODULE_DESCRIPTION(DRV_DESC);
-MODULE_VERSION(DRV_VERSION);
-
projects / openwrt / svn-archive / archive.git / blobdiff