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![Uwe Kleine-König](/assets/img/avatar_default.png)
The driver core ignores the return value of struct device_driver::remove because there is only little that can be done. To simplify the quest to make this function return void, let struct sa1111_driver::remove return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea and ensures future users behave accordingly. Link: https://lore.kernel.org/r/20201126114724.2028511-1-u.kleine-koenig@pengutronix.de Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
386 lines
8.1 KiB
C
386 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/input/serio/sa1111ps2.c
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*
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* Copyright (C) 2002 Russell King
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <asm/io.h>
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#include <asm/hardware/sa1111.h>
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#define PS2CR 0x0000
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#define PS2STAT 0x0004
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#define PS2DATA 0x0008
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#define PS2CLKDIV 0x000c
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#define PS2PRECNT 0x0010
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#define PS2CR_ENA 0x08
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#define PS2CR_FKD 0x02
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#define PS2CR_FKC 0x01
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#define PS2STAT_STP 0x0100
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#define PS2STAT_TXE 0x0080
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#define PS2STAT_TXB 0x0040
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#define PS2STAT_RXF 0x0020
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#define PS2STAT_RXB 0x0010
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#define PS2STAT_ENA 0x0008
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#define PS2STAT_RXP 0x0004
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#define PS2STAT_KBD 0x0002
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#define PS2STAT_KBC 0x0001
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struct ps2if {
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struct serio *io;
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struct sa1111_dev *dev;
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void __iomem *base;
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int rx_irq;
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int tx_irq;
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unsigned int open;
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spinlock_t lock;
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unsigned int head;
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unsigned int tail;
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unsigned char buf[4];
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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. If there was a
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* framing error, we have to manually clear the status.
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*/
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static irqreturn_t 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 scancode, flag, status;
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status = readl_relaxed(ps2if->base + PS2STAT);
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while (status & PS2STAT_RXF) {
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if (status & PS2STAT_STP)
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writel_relaxed(PS2STAT_STP, ps2if->base + PS2STAT);
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flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) |
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(status & PS2STAT_RXP ? 0 : SERIO_PARITY);
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scancode = readl_relaxed(ps2if->base + PS2DATA) & 0xff;
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if (hweight8(scancode) & 1)
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flag ^= SERIO_PARITY;
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serio_interrupt(ps2if->io, scancode, flag);
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status = readl_relaxed(ps2if->base + PS2STAT);
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}
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return IRQ_HANDLED;
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}
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/*
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* Completion of ps2 write
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*/
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static irqreturn_t ps2_txint(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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spin_lock(&ps2if->lock);
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status = readl_relaxed(ps2if->base + PS2STAT);
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if (ps2if->head == ps2if->tail) {
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disable_irq_nosync(irq);
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/* done */
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} else if (status & PS2STAT_TXE) {
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writel_relaxed(ps2if->buf[ps2if->tail], ps2if->base + PS2DATA);
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ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
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}
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spin_unlock(&ps2if->lock);
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return IRQ_HANDLED;
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}
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/*
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* Write a byte to the PS2 port. We have to wait for the
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* port to indicate that the transmitter is empty.
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*/
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static int 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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unsigned long flags;
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unsigned int head;
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spin_lock_irqsave(&ps2if->lock, flags);
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/*
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* If the TX register is empty, we can go straight out.
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*/
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if (readl_relaxed(ps2if->base + PS2STAT) & PS2STAT_TXE) {
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writel_relaxed(val, ps2if->base + PS2DATA);
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} else {
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if (ps2if->head == ps2if->tail)
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enable_irq(ps2if->tx_irq);
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head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1);
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if (head != ps2if->tail) {
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ps2if->buf[ps2if->head] = val;
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ps2if->head = head;
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}
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}
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spin_unlock_irqrestore(&ps2if->lock, flags);
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return 0;
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}
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static int ps2_open(struct serio *io)
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{
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struct ps2if *ps2if = io->port_data;
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int ret;
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ret = sa1111_enable_device(ps2if->dev);
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if (ret)
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return ret;
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ret = request_irq(ps2if->rx_irq, ps2_rxint, 0,
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SA1111_DRIVER_NAME(ps2if->dev), ps2if);
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if (ret) {
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printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
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ps2if->rx_irq, ret);
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sa1111_disable_device(ps2if->dev);
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return ret;
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}
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ret = request_irq(ps2if->tx_irq, ps2_txint, 0,
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SA1111_DRIVER_NAME(ps2if->dev), ps2if);
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if (ret) {
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printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
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ps2if->tx_irq, ret);
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free_irq(ps2if->rx_irq, ps2if);
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sa1111_disable_device(ps2if->dev);
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return ret;
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}
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ps2if->open = 1;
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enable_irq_wake(ps2if->rx_irq);
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writel_relaxed(PS2CR_ENA, ps2if->base + PS2CR);
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return 0;
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}
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static void ps2_close(struct serio *io)
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{
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struct ps2if *ps2if = io->port_data;
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writel_relaxed(0, ps2if->base + PS2CR);
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disable_irq_wake(ps2if->rx_irq);
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ps2if->open = 0;
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free_irq(ps2if->tx_irq, ps2if);
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free_irq(ps2if->rx_irq, ps2if);
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sa1111_disable_device(ps2if->dev);
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}
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/*
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* Clear the input buffer.
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*/
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static void ps2_clear_input(struct ps2if *ps2if)
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{
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int maxread = 100;
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while (maxread--) {
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if ((readl_relaxed(ps2if->base + PS2DATA) & 0xff) == 0xff)
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break;
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}
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}
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static unsigned int ps2_test_one(struct ps2if *ps2if,
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unsigned int mask)
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{
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unsigned int val;
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writel_relaxed(PS2CR_ENA | mask, ps2if->base + PS2CR);
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udelay(10);
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val = readl_relaxed(ps2if->base + PS2STAT);
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return val & (PS2STAT_KBC | PS2STAT_KBD);
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}
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/*
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* Test the keyboard interface. We basically check to make sure that
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* we can drive each line to the keyboard independently of each other.
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*/
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static int ps2_test(struct ps2if *ps2if)
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{
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unsigned int stat;
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int ret = 0;
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stat = ps2_test_one(ps2if, PS2CR_FKC);
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if (stat != PS2STAT_KBD) {
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printk("PS/2 interface test failed[1]: %02x\n", stat);
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ret = -ENODEV;
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}
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stat = ps2_test_one(ps2if, 0);
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if (stat != (PS2STAT_KBC | PS2STAT_KBD)) {
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printk("PS/2 interface test failed[2]: %02x\n", stat);
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ret = -ENODEV;
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}
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stat = ps2_test_one(ps2if, PS2CR_FKD);
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if (stat != PS2STAT_KBC) {
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printk("PS/2 interface test failed[3]: %02x\n", stat);
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ret = -ENODEV;
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}
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writel_relaxed(0, ps2if->base + PS2CR);
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return ret;
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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 ps2_probe(struct sa1111_dev *dev)
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{
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struct ps2if *ps2if;
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struct serio *serio;
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int ret;
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ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
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serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
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if (!ps2if || !serio) {
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ret = -ENOMEM;
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goto free;
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}
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serio->id.type = SERIO_8042;
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serio->write = ps2_write;
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serio->open = ps2_open;
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serio->close = ps2_close;
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strlcpy(serio->name, dev_name(&dev->dev), sizeof(serio->name));
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strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
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serio->port_data = ps2if;
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serio->dev.parent = &dev->dev;
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ps2if->io = serio;
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ps2if->dev = dev;
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sa1111_set_drvdata(dev, ps2if);
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spin_lock_init(&ps2if->lock);
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ps2if->rx_irq = sa1111_get_irq(dev, 0);
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if (ps2if->rx_irq <= 0) {
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ret = ps2if->rx_irq ? : -ENXIO;
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goto free;
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}
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ps2if->tx_irq = sa1111_get_irq(dev, 1);
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if (ps2if->tx_irq <= 0) {
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ret = ps2if->tx_irq ? : -ENXIO;
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goto free;
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}
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/*
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* Request the physical region for this PS2 port.
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*/
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if (!request_mem_region(dev->res.start,
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dev->res.end - dev->res.start + 1,
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SA1111_DRIVER_NAME(dev))) {
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ret = -EBUSY;
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goto free;
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}
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/*
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* Our parent device has already mapped the region.
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*/
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ps2if->base = dev->mapbase;
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sa1111_enable_device(ps2if->dev);
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/* Incoming clock is 8MHz */
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writel_relaxed(0, ps2if->base + PS2CLKDIV);
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writel_relaxed(127, ps2if->base + PS2PRECNT);
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/*
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* Flush any pending input.
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*/
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ps2_clear_input(ps2if);
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/*
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* Test the keyboard interface.
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*/
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ret = ps2_test(ps2if);
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if (ret)
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goto out;
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/*
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* Flush any pending input.
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*/
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ps2_clear_input(ps2if);
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sa1111_disable_device(ps2if->dev);
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serio_register_port(ps2if->io);
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return 0;
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out:
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sa1111_disable_device(ps2if->dev);
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release_mem_region(dev->res.start, resource_size(&dev->res));
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free:
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sa1111_set_drvdata(dev, NULL);
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kfree(ps2if);
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kfree(serio);
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return ret;
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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 void ps2_remove(struct sa1111_dev *dev)
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{
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struct ps2if *ps2if = sa1111_get_drvdata(dev);
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serio_unregister_port(ps2if->io);
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release_mem_region(dev->res.start, resource_size(&dev->res));
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sa1111_set_drvdata(dev, NULL);
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kfree(ps2if);
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}
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/*
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* Our device driver structure
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*/
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static struct sa1111_driver ps2_driver = {
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.drv = {
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.name = "sa1111-ps2",
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.owner = THIS_MODULE,
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},
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.devid = SA1111_DEVID_PS2,
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.probe = ps2_probe,
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.remove = ps2_remove,
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};
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static int __init ps2_init(void)
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{
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return sa1111_driver_register(&ps2_driver);
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}
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static void __exit ps2_exit(void)
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{
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sa1111_driver_unregister(&ps2_driver);
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}
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module_init(ps2_init);
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module_exit(ps2_exit);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("SA1111 PS2 controller driver");
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MODULE_LICENSE("GPL");
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