^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Altera University Program PS2 controller driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Based on sa1111ps2.c, which is:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2002 Russell King
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/serio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define DRV_NAME "altera_ps2"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct ps2if {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct serio *io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Read all bytes waiting in the PS2 port. There should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * at the most one, but we loop for safety.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct ps2if *ps2if = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) unsigned int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) irqreturn_t handled = IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) while ((status = readl(ps2if->base)) & 0xffff0000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) serio_interrupt(ps2if->io, status & 0xff, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) handled = IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return handled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * Write a byte to the PS2 port.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static int altera_ps2_write(struct serio *io, unsigned char val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct ps2if *ps2if = io->port_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) writel(val, ps2if->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static int altera_ps2_open(struct serio *io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct ps2if *ps2if = io->port_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /* clear fifo */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) while (readl(ps2if->base) & 0xffff0000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* empty */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) writel(1, ps2if->base + 4); /* enable rx irq */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static void altera_ps2_close(struct serio *io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct ps2if *ps2if = io->port_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) writel(0, ps2if->base + 4); /* disable rx irq */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * Add one device to this driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static int altera_ps2_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct ps2if *ps2if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct serio *serio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int error, irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) ps2if = devm_kzalloc(&pdev->dev, sizeof(struct ps2if), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (!ps2if)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) ps2if->base = devm_ioremap_resource(&pdev->dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (IS_ERR(ps2if->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return PTR_ERR(ps2if->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (irq < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) error = devm_request_irq(&pdev->dev, irq, altera_ps2_rxint, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) pdev->name, ps2if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) dev_err(&pdev->dev, "could not request IRQ %d\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (!serio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) serio->id.type = SERIO_8042;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) serio->write = altera_ps2_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) serio->open = altera_ps2_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) serio->close = altera_ps2_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) strlcpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) strlcpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) serio->port_data = ps2if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) serio->dev.parent = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) ps2if->io = serio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) serio_register_port(ps2if->io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) platform_set_drvdata(pdev, ps2if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * Remove one device from this driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static int altera_ps2_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct ps2if *ps2if = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) serio_unregister_port(ps2if->io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static const struct of_device_id altera_ps2_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) { .compatible = "ALTR,ps2-1.0", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) { .compatible = "altr,ps2-1.0", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) MODULE_DEVICE_TABLE(of, altera_ps2_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) #endif /* CONFIG_OF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) * Our device driver structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static struct platform_driver altera_ps2_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) .probe = altera_ps2_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) .remove = altera_ps2_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .name = DRV_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) .of_match_table = of_match_ptr(altera_ps2_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) module_platform_driver(altera_ps2_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) MODULE_ALIAS("platform:" DRV_NAME);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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