openwrt/upstream - upstream openwrt

	Commit message (Expand)	Author	Age	Files	Lines
*	brcm2708: update 4.1 patches	John Crispin	2015-12-17	1	-2/+2
*	brcm2708: update 4.1 patches	John Crispin	2015-10-26	1	-2/+2
*	brcm2708: update 4.1 patches	Felix Fietkau	2015-09-11	1	-2/+2
*	brcm2708: update 4.1 patches	John Crispin	2015-08-17	1	-0/+20

/* * 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);