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-----BEGIN PGP SIGNATURE----- iQIVAwUAWPiW6vSw1s6N8H32AQLOrw/+NTqGf7bjq+64YKS6NfR0XDgE+wNJltGO ck7zJW3NHIg76RNu8s0I9xg5aVmwizz3Z5DGROZquaolnezux4tQihZ3AFyxIzLc +Y3WHYagcML7yFfjl/WznCLRD5EW3yPln4lCvQO0nW/xICRYeRI057JaIbi2Dtek BhcXt3c4AjXDLdYJkgtHV3p2R2mt8hcdFdWqqx6s7JaIThZNRGNzxAgtbcB9k5IW HVG9ZEIL73VBYWHrYivzjHYF5rBnNCPt87eOwDQeTOSkhv8te+u9k+bH8vxZw1T0 XUtDrLBndKiuVo2GUfLkkF8LItx3Q9eLCJYy0joaIliyPqTEsPx9KjQ+Af0cxS9s ZPCZ5SYf96stKmDeL5xaMfrAmeyVHJ4lc4JTOqdzbIT8blsOSfYO/03p0ALShSDv /RQLaKGlf8Bjoy8PwKFcXb4sIDufcd/U1Av/EMFXxOfgN/u2JUkGKq6EaIM5B68L fHPje+aR9VNELPmPjwNOWtmN4I79EH3EItQf7zv0KG+UeKhcHLx/EAcSJ3ZRKEkH Lathg7pPOEJGArPiVO79TZzBG01ADn1aiwv65XObMzNZ+54xI/mN/Y1DNF/kL5jU XzvNzEjFt8mwMIZGVNdAt4+pDyMfIZGZSyUkSRKFnaQZMIvQrfQIU9RLBYLX5eOx +/p0VkIwDpg= =lbS7 -----END PGP SIGNATURE----- Merge tag 'hwparam-20170420' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs Pull hw lockdown support from David Howells: "Annotation of module parameters that configure hardware resources including ioports, iomem addresses, irq lines and dma channels. This allows a future patch to prohibit the use of such module parameters to prevent that hardware from being abused to gain access to the running kernel image as part of locking the kernel down under UEFI secure boot conditions. Annotations are made by changing: module_param(n, t, p) module_param_named(n, v, t, p) module_param_array(n, t, m, p) to: module_param_hw(n, t, hwtype, p) module_param_hw_named(n, v, t, hwtype, p) module_param_hw_array(n, t, hwtype, m, p) where the module parameter refers to a hardware setting hwtype specifies the type of the resource being configured. This can be one of: ioport Module parameter configures an I/O port iomem Module parameter configures an I/O mem address ioport_or_iomem Module parameter could be either (runtime set) irq Module parameter configures an I/O port dma Module parameter configures a DMA channel dma_addr Module parameter configures a DMA buffer address other Module parameter configures some other value Note that the hwtype is compile checked, but not currently stored (the lockdown code probably won't require it). It is, however, there for future use. A bonus is that the hwtype can also be used for grepping. The intention is for the kernel to ignore or reject attempts to set annotated module parameters if lockdown is enabled. This applies to options passed on the boot command line, passed to insmod/modprobe or direct twiddling in /sys/module/ parameter files. The module initialisation then needs to handle the parameter not being set, by (1) giving an error, (2) probing for a value or (3) using a reasonable default. What I can't do is just reject a module out of hand because it may take a hardware setting in the module parameters. Some important modules, some ipmi stuff for instance, both probe for hardware and allow hardware to be manually specified; if the driver is aborts with any error, you don't get any ipmi hardware. Further, trying to do this entirely in the module initialisation code doesn't protect against sysfs twiddling. [!] Note that in and of itself, this series of patches should have no effect on the the size of the kernel or code execution - that is left to a patch in the next series to effect. It does mark annotated kernel parameters with a KERNEL_PARAM_FL_HWPARAM flag in an already existing field" * tag 'hwparam-20170420' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: (38 commits) Annotate hardware config module parameters in sound/pci/ Annotate hardware config module parameters in sound/oss/ Annotate hardware config module parameters in sound/isa/ Annotate hardware config module parameters in sound/drivers/ Annotate hardware config module parameters in fs/pstore/ Annotate hardware config module parameters in drivers/watchdog/ Annotate hardware config module parameters in drivers/video/ Annotate hardware config module parameters in drivers/tty/ Annotate hardware config module parameters in drivers/staging/vme/ Annotate hardware config module parameters in drivers/staging/speakup/ Annotate hardware config module parameters in drivers/staging/media/ Annotate hardware config module parameters in drivers/scsi/ Annotate hardware config module parameters in drivers/pcmcia/ Annotate hardware config module parameters in drivers/pci/hotplug/ Annotate hardware config module parameters in drivers/parport/ Annotate hardware config module parameters in drivers/net/wireless/ Annotate hardware config module parameters in drivers/net/wan/ Annotate hardware config module parameters in drivers/net/irda/ Annotate hardware config module parameters in drivers/net/hamradio/ Annotate hardware config module parameters in drivers/net/ethernet/ ...
292 lines
7.8 KiB
C
292 lines
7.8 KiB
C
/*
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* GPIO driver for the ACCES 104-IDIO-16 family
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* Copyright (C) 2015 William Breathitt Gray
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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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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* This driver supports the following ACCES devices: 104-IDIO-16,
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* 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8.
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*/
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/gpio/driver.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/irqdesc.h>
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#include <linux/isa.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/spinlock.h>
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#define IDIO_16_EXTENT 8
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#define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)
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static unsigned int base[MAX_NUM_IDIO_16];
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static unsigned int num_idio_16;
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module_param_hw_array(base, uint, ioport, &num_idio_16, 0);
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MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");
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static unsigned int irq[MAX_NUM_IDIO_16];
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module_param_hw_array(irq, uint, irq, NULL, 0);
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MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
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/**
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* struct idio_16_gpio - GPIO device private data structure
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* @chip: instance of the gpio_chip
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* @lock: synchronization lock to prevent I/O race conditions
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* @irq_mask: I/O bits affected by interrupts
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* @base: base port address of the GPIO device
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* @out_state: output bits state
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*/
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struct idio_16_gpio {
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struct gpio_chip chip;
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raw_spinlock_t lock;
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unsigned long irq_mask;
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unsigned base;
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unsigned out_state;
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};
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static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
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{
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if (offset > 15)
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return 1;
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return 0;
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}
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static int idio_16_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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return 0;
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}
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static int idio_16_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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chip->set(chip, offset, value);
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return 0;
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}
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static int idio_16_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
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const unsigned mask = BIT(offset-16);
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if (offset < 16)
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return -EINVAL;
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if (offset < 24)
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return !!(inb(idio16gpio->base + 1) & mask);
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return !!(inb(idio16gpio->base + 5) & (mask>>8));
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}
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static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
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const unsigned mask = BIT(offset);
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unsigned long flags;
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if (offset > 15)
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return;
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raw_spin_lock_irqsave(&idio16gpio->lock, flags);
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if (value)
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idio16gpio->out_state |= mask;
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else
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idio16gpio->out_state &= ~mask;
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if (offset > 7)
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outb(idio16gpio->out_state >> 8, idio16gpio->base + 4);
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else
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outb(idio16gpio->out_state, idio16gpio->base);
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raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
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}
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static void idio_16_gpio_set_multiple(struct gpio_chip *chip,
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unsigned long *mask, unsigned long *bits)
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{
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struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
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unsigned long flags;
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raw_spin_lock_irqsave(&idio16gpio->lock, flags);
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idio16gpio->out_state &= ~*mask;
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idio16gpio->out_state |= *mask & *bits;
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if (*mask & 0xFF)
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outb(idio16gpio->out_state, idio16gpio->base);
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if ((*mask >> 8) & 0xFF)
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outb(idio16gpio->out_state >> 8, idio16gpio->base + 4);
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raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
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}
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static void idio_16_irq_ack(struct irq_data *data)
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{
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}
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static void idio_16_irq_mask(struct irq_data *data)
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{
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struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
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struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
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const unsigned long mask = BIT(irqd_to_hwirq(data));
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unsigned long flags;
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idio16gpio->irq_mask &= ~mask;
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if (!idio16gpio->irq_mask) {
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raw_spin_lock_irqsave(&idio16gpio->lock, flags);
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outb(0, idio16gpio->base + 2);
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raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
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}
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}
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static void idio_16_irq_unmask(struct irq_data *data)
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{
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struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
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struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
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const unsigned long mask = BIT(irqd_to_hwirq(data));
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const unsigned long prev_irq_mask = idio16gpio->irq_mask;
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unsigned long flags;
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idio16gpio->irq_mask |= mask;
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if (!prev_irq_mask) {
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raw_spin_lock_irqsave(&idio16gpio->lock, flags);
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inb(idio16gpio->base + 2);
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raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
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}
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}
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static int idio_16_irq_set_type(struct irq_data *data, unsigned flow_type)
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{
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/* The only valid irq types are none and both-edges */
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if (flow_type != IRQ_TYPE_NONE &&
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(flow_type & IRQ_TYPE_EDGE_BOTH) != IRQ_TYPE_EDGE_BOTH)
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return -EINVAL;
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return 0;
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}
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static struct irq_chip idio_16_irqchip = {
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.name = "104-idio-16",
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.irq_ack = idio_16_irq_ack,
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.irq_mask = idio_16_irq_mask,
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.irq_unmask = idio_16_irq_unmask,
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.irq_set_type = idio_16_irq_set_type
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};
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static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
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{
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struct idio_16_gpio *const idio16gpio = dev_id;
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struct gpio_chip *const chip = &idio16gpio->chip;
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int gpio;
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for_each_set_bit(gpio, &idio16gpio->irq_mask, chip->ngpio)
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generic_handle_irq(irq_find_mapping(chip->irqdomain, gpio));
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raw_spin_lock(&idio16gpio->lock);
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outb(0, idio16gpio->base + 1);
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raw_spin_unlock(&idio16gpio->lock);
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return IRQ_HANDLED;
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}
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#define IDIO_16_NGPIO 32
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static const char *idio_16_names[IDIO_16_NGPIO] = {
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"OUT0", "OUT1", "OUT2", "OUT3", "OUT4", "OUT5", "OUT6", "OUT7",
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"OUT8", "OUT9", "OUT10", "OUT11", "OUT12", "OUT13", "OUT14", "OUT15",
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"IIN0", "IIN1", "IIN2", "IIN3", "IIN4", "IIN5", "IIN6", "IIN7",
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"IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15"
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};
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static int idio_16_probe(struct device *dev, unsigned int id)
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{
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struct idio_16_gpio *idio16gpio;
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const char *const name = dev_name(dev);
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int err;
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idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
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if (!idio16gpio)
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return -ENOMEM;
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if (!devm_request_region(dev, base[id], IDIO_16_EXTENT, name)) {
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dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
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base[id], base[id] + IDIO_16_EXTENT);
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return -EBUSY;
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}
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idio16gpio->chip.label = name;
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idio16gpio->chip.parent = dev;
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idio16gpio->chip.owner = THIS_MODULE;
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idio16gpio->chip.base = -1;
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idio16gpio->chip.ngpio = IDIO_16_NGPIO;
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idio16gpio->chip.names = idio_16_names;
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idio16gpio->chip.get_direction = idio_16_gpio_get_direction;
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idio16gpio->chip.direction_input = idio_16_gpio_direction_input;
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idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
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idio16gpio->chip.get = idio_16_gpio_get;
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idio16gpio->chip.set = idio_16_gpio_set;
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idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple;
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idio16gpio->base = base[id];
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idio16gpio->out_state = 0xFFFF;
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raw_spin_lock_init(&idio16gpio->lock);
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err = devm_gpiochip_add_data(dev, &idio16gpio->chip, idio16gpio);
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if (err) {
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dev_err(dev, "GPIO registering failed (%d)\n", err);
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return err;
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}
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/* Disable IRQ by default */
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outb(0, base[id] + 2);
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outb(0, base[id] + 1);
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err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
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handle_edge_irq, IRQ_TYPE_NONE);
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if (err) {
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dev_err(dev, "Could not add irqchip (%d)\n", err);
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return err;
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}
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err = devm_request_irq(dev, irq[id], idio_16_irq_handler, 0, name,
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idio16gpio);
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if (err) {
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dev_err(dev, "IRQ handler registering failed (%d)\n", err);
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return err;
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}
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return 0;
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}
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static struct isa_driver idio_16_driver = {
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.probe = idio_16_probe,
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.driver = {
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.name = "104-idio-16"
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},
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};
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module_isa_driver(idio_16_driver, num_idio_16);
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MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
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MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
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MODULE_LICENSE("GPL v2");
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