mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-14 00:36:53 +07:00
d797da41b2
Pull input subsystem updates from Dmitry Torokhov: "Two new drivers for Elan hardware (for I2C touchpad and touchscreen found in several Chromebooks and other devices), a driver for Goodix touch panel, and small fixes to Cypress I2C trackpad and other input drivers. Also we switched to use __maybe_unused instead of gating suspend/ resume code with #ifdef guards to get better compile coverage" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (27 commits) Input: gpio_keys - fix warning regarding uninitialized 'button' variable Input: add support for Elan eKTH I2C touchscreens Input: gpio_keys - fix warning regarding uninitialized 'irq' variable Input: cyapa - use 'error' for error codes Input: cyapa - fix resuming the device Input: gpio_keys - add device tree support for interrupt only keys Input: amikbd - allocate temporary keymap buffer on the stack Input: amikbd - fix build if !CONFIG_HW_CONSOLE Input: lm8323 - missing error check in lm8323_set_disable() Input: initialize device counter variables with -1 Input: initialize input_no to -1 to avoid subtraction Input: i8042 - do not try to load on Intel NUC D54250WYK Input: atkbd - correct MSC_SCAN events for force_release keys Input: cyapa - switch to using managed resources Input: lifebook - use "static inline" instead of "inline" in lifebook.h Input: touchscreen - use __maybe_unused instead of ifdef around suspend/resume Input: mouse - use __maybe_unused instead of ifdef around suspend/resume Input: misc - use __maybe_unused instead of ifdef around suspend/resume Input: cap11xx - support for irq-active-high option Input: cap11xx - add support for various cap11xx devices ...
168 lines
3.7 KiB
C
168 lines
3.7 KiB
C
/*
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* Altera University Program PS2 controller driver
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*
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* Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
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*
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* Based on sa1111ps2.c, which is:
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* Copyright (C) 2002 Russell King
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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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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#define DRV_NAME "altera_ps2"
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struct ps2if {
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struct serio *io;
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void __iomem *base;
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};
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/*
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* Read all bytes waiting in the PS2 port. There should be
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* at the most one, but we loop for safety.
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*/
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static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
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{
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struct ps2if *ps2if = dev_id;
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unsigned int status;
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irqreturn_t handled = IRQ_NONE;
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while ((status = readl(ps2if->base)) & 0xffff0000) {
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serio_interrupt(ps2if->io, status & 0xff, 0);
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handled = IRQ_HANDLED;
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}
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return handled;
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}
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/*
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* Write a byte to the PS2 port.
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*/
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static int altera_ps2_write(struct serio *io, unsigned char val)
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{
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struct ps2if *ps2if = io->port_data;
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writel(val, ps2if->base);
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return 0;
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}
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static int altera_ps2_open(struct serio *io)
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{
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struct ps2if *ps2if = io->port_data;
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/* clear fifo */
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while (readl(ps2if->base) & 0xffff0000)
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/* empty */;
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writel(1, ps2if->base + 4); /* enable rx irq */
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return 0;
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}
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static void altera_ps2_close(struct serio *io)
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{
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struct ps2if *ps2if = io->port_data;
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writel(0, ps2if->base + 4); /* disable rx irq */
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}
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/*
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* Add one device to this driver.
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*/
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static int altera_ps2_probe(struct platform_device *pdev)
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{
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struct ps2if *ps2if;
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struct resource *res;
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struct serio *serio;
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int error, irq;
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ps2if = devm_kzalloc(&pdev->dev, sizeof(struct ps2if), GFP_KERNEL);
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if (!ps2if)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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ps2if->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(ps2if->base))
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return PTR_ERR(ps2if->base);
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return -ENXIO;
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error = devm_request_irq(&pdev->dev, irq, altera_ps2_rxint, 0,
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pdev->name, ps2if);
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if (error) {
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dev_err(&pdev->dev, "could not request IRQ %d\n", irq);
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return error;
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}
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serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
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if (!serio)
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return -ENOMEM;
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serio->id.type = SERIO_8042;
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serio->write = altera_ps2_write;
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serio->open = altera_ps2_open;
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serio->close = altera_ps2_close;
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strlcpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
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strlcpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
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serio->port_data = ps2if;
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serio->dev.parent = &pdev->dev;
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ps2if->io = serio;
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dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, irq);
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serio_register_port(ps2if->io);
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platform_set_drvdata(pdev, ps2if);
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return 0;
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}
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/*
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* Remove one device from this driver.
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*/
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static int altera_ps2_remove(struct platform_device *pdev)
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{
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struct ps2if *ps2if = platform_get_drvdata(pdev);
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serio_unregister_port(ps2if->io);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id altera_ps2_match[] = {
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{ .compatible = "ALTR,ps2-1.0", },
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{ .compatible = "altr,ps2-1.0", },
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{},
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};
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MODULE_DEVICE_TABLE(of, altera_ps2_match);
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#endif /* CONFIG_OF */
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/*
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* Our device driver structure
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*/
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static struct platform_driver altera_ps2_driver = {
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.probe = altera_ps2_probe,
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.remove = altera_ps2_remove,
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.driver = {
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.name = DRV_NAME,
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.of_match_table = of_match_ptr(altera_ps2_match),
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},
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};
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module_platform_driver(altera_ps2_driver);
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MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
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MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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