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#
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# Copyright (C) 2010 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk |
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include $(INCLUDE_DIR)/kernel.mk |
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PKG_NAME:=pwm-gpio-custom
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk |
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define KernelPackage/pwm-gpio-custom |
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SUBMENU:=Other modules
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TITLE:=Custom GPIO-based PWM device
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DEPENDS:=+kmod-pwm-gpio
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FILES:=$(PKG_BUILD_DIR)/pwm-gpio-custom.ko
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KCONFIG:=
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endef |
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define KernelPackage/pwm-gpio-custom/description |
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Kernel module to register a custom pwm-gpio platform device.
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endef |
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EXTRA_KCONFIG:= \
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CONFIG_PWM_GPIO_CUSTOM=m
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EXTRA_CFLAGS:= \
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$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=m,%,$(filter %=m,$(EXTRA_KCONFIG)))) \
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$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=y,%,$(filter %=y,$(EXTRA_KCONFIG))))
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MAKE_OPTS:= \
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ARCH="$(LINUX_KARCH)" \
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CROSS_COMPILE="$(TARGET_CROSS)" \
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SUBDIRS="$(PKG_BUILD_DIR)" \
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EXTRA_CFLAGS="$(EXTRA_CFLAGS)" \
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$(EXTRA_KCONFIG)
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define Build/Prepare |
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mkdir -p $(PKG_BUILD_DIR)
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$(CP) ./src/* $(PKG_BUILD_DIR)/
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endef |
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define Build/Compile |
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$(MAKE) -C "$(LINUX_DIR)" \
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$(MAKE_OPTS) \
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modules
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endef |
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$(eval $(call KernelPackage,pwm-gpio-custom)) |
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@ -0,0 +1,4 @@ |
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config PWM_MASTER_GPIO_CUSTOM |
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tristate "Custom GPIO-based PWM driver" |
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depends on GENERIC_GPIO |
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select PWM_GENERIC_GPIO |
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obj-${CONFIG_PWM_GPIO_CUSTOM} += pwm-gpio-custom.o
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@ -0,0 +1,217 @@ |
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/*
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* Custom GPIO-based PWM driver |
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* |
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* Based on w1-gpio-custom by Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org> |
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* Copyright (C) 2010 Claudio Mignanti <c.mignanti@gmail.com > |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* --------------------------------------------------------------------------- |
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* |
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* The behaviour of this driver can be altered by setting some parameters |
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* from the insmod command line. |
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* |
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* The following parameters are adjustable: |
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* |
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* bus0 These four arguments must be arrays |
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* bus1 |
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* ..... |
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* bus10 <id>,<pin>,<od> |
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* |
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* where: |
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* |
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* <id> ID to used as device_id for the corresponding bus (required) |
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* <pin> GPIO pin ID for PWM channel (required) |
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* * |
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* If this driver is built into the kernel, you can use the following kernel |
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* command line parameters, with the same values as the corresponding module |
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* parameters listed above: |
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* |
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* pwm-gpio-custom.bus0 |
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* pwm-gpio-custom.bus1 |
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* pwm-gpio-custom.bunN |
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* pwm-gpio-custom.bus10 |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/pwm/pwm.h> |
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#define DRV_NAME "pwm-gpio-custom" |
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#define DRV_DESC "Custom GPIO-based pwm driver" |
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#define DRV_VERSION "0.1.0" |
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#define PFX DRV_NAME ": " |
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#define BUS_PARAM_ID 0 |
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#define BUS_PARAM_PIN 1 |
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#define BUS_PARAM_REQUIRED 2 |
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#define BUS_PARAM_COUNT 2 |
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#define BUS_COUNT_MAX 10 |
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static unsigned int bus0[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus1[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus2[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus3[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus4[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus5[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus6[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus7[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus8[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus9[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus_nump[BUS_COUNT_MAX] __initdata; |
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#define BUS_PARM_DESC " config -> id,pin" |
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module_param_array(bus0, uint, &bus_nump[0], 0); |
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MODULE_PARM_DESC(bus0, "bus0" BUS_PARM_DESC); |
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module_param_array(bus1, uint, &bus_nump[1], 0); |
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MODULE_PARM_DESC(bus1, "bus1" BUS_PARM_DESC); |
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module_param_array(bus2, uint, &bus_nump[2], 0); |
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MODULE_PARM_DESC(bus2, "bus2" BUS_PARM_DESC); |
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module_param_array(bus3, uint, &bus_nump[3], 0); |
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MODULE_PARM_DESC(bus3, "bus3" BUS_PARM_DESC); |
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module_param_array(bus4, uint, &bus_nump[4], 0); |
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MODULE_PARM_DESC(bus4, "bus4" BUS_PARM_DESC); |
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module_param_array(bus5, uint, &bus_nump[5], 0); |
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MODULE_PARM_DESC(bus5, "bus5" BUS_PARM_DESC); |
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module_param_array(bus6, uint, &bus_nump[6], 0); |
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MODULE_PARM_DESC(bus6, "bus6" BUS_PARM_DESC); |
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module_param_array(bus7, uint, &bus_nump[7], 0); |
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MODULE_PARM_DESC(bus7, "bus7" BUS_PARM_DESC); |
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module_param_array(bus8, uint, &bus_nump[8], 0); |
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MODULE_PARM_DESC(bus8, "bus8" BUS_PARM_DESC); |
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module_param_array(bus9, uint, &bus_nump[9], 0); |
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MODULE_PARM_DESC(bus9, "bus9" BUS_PARM_DESC); |
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static struct platform_device *devices[BUS_COUNT_MAX]; |
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static unsigned int nr_devices; |
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static void pwm_gpio_custom_cleanup(void) |
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{ |
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int i; |
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for (i = 0; i < nr_devices; i++) |
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if (devices[i]) |
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platform_device_put(devices[i]); |
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} |
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static int __init pwm_gpio_custom_add_one(unsigned int id, unsigned int *params) |
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{ |
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struct platform_device *pdev; |
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struct gpio_pwm_platform_data pdata; |
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int err; |
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if (!bus_nump[id]) |
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return 0; |
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if (bus_nump[id] < BUS_PARAM_REQUIRED) { |
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printk(KERN_ERR PFX "not enough parameters for bus%d\n", id); |
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err = -EINVAL; |
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goto err; |
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} |
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pdev = platform_device_alloc("gpio_pwm", params[BUS_PARAM_ID]); |
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if (!pdev) { |
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err = -ENOMEM; |
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goto err; |
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} |
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pdata.gpio = params[BUS_PARAM_PIN]; |
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err = platform_device_add_data(pdev, &pdata, sizeof(pdata)); |
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if (err) |
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goto err_put; |
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err = platform_device_add(pdev); |
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if (err) |
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goto err_put; |
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devices[nr_devices++] = pdev; |
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return 0; |
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err_put: |
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platform_device_put(pdev); |
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err: |
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return err; |
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} |
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static int __init pwm_gpio_custom_probe(void) |
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{ |
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int err; |
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nr_devices = 0; |
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printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n"); |
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err = pwm_gpio_custom_add_one(0, bus0); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(1, bus1); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(2, bus2); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(3, bus3); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(4, bus4); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(5, bus5); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(6, bus6); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(7, bus7); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(8, bus8); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(9, bus9); |
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if (err) goto err; |
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if (!nr_devices) { |
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printk(KERN_ERR PFX "no bus parameter(s) specified\n"); |
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err = -ENODEV; |
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goto err; |
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} |
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return 0; |
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err: |
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pwm_gpio_custom_cleanup(); |
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return err; |
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} |
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#ifdef MODULE |
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static int __init pwm_gpio_custom_init(void) |
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{ |
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return pwm_gpio_custom_probe(); |
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} |
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module_init(pwm_gpio_custom_init); |
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static void __exit pwm_gpio_custom_exit(void) |
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{ |
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pwm_gpio_custom_cleanup(); |
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} |
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module_exit(pwm_gpio_custom_exit); |
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#else |
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subsys_initcall(pwm_gpio_custom_probe); |
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#endif /* MODULE*/ |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Bifferos <bifferos at yahoo.co.uk >"); |
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MODULE_AUTHOR("Claudio Mignanti <c.mignanti@gmail.com >"); |
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MODULE_DESCRIPTION(DRV_DESC); |
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MODULE_VERSION(DRV_VERSION); |
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