diff options
Diffstat (limited to 'drivers/input/keyboard/hilkbd.c')
| -rw-r--r-- | drivers/input/keyboard/hilkbd.c | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/drivers/input/keyboard/hilkbd.c b/drivers/input/keyboard/hilkbd.c new file mode 100644 index 0000000000..c1a4d5055d --- /dev/null +++ b/drivers/input/keyboard/hilkbd.c @@ -0,0 +1,392 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/drivers/hil/hilkbd.c + * + * Copyright (C) 1998 Philip Blundell <philb@gnu.org> + * Copyright (C) 1999 Matthew Wilcox <willy@infradead.org> + * Copyright (C) 1999-2007 Helge Deller <deller@gmx.de> + * + * Very basic HP Human Interface Loop (HIL) driver. + * This driver handles the keyboard on HP300 (m68k) and on some + * HP700 (parisc) series machines. + */ + +#include <linux/pci_ids.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/input.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/hil.h> +#include <linux/io.h> +#include <linux/sched.h> +#include <linux/spinlock.h> +#include <asm/irq.h> +#ifdef CONFIG_HP300 +#include <asm/hwtest.h> +#endif + + +MODULE_AUTHOR("Philip Blundell, Matthew Wilcox, Helge Deller"); +MODULE_DESCRIPTION("HIL keyboard driver (basic functionality)"); +MODULE_LICENSE("GPL v2"); + + +#if defined(CONFIG_PARISC) + + #include <asm/io.h> + #include <asm/hardware.h> + #include <asm/parisc-device.h> + static unsigned long hil_base; /* HPA for the HIL device */ + static unsigned int hil_irq; + #define HILBASE hil_base /* HPPA (parisc) port address */ + #define HIL_DATA 0x800 + #define HIL_CMD 0x801 + #define HIL_IRQ hil_irq + #define hil_readb(p) gsc_readb(p) + #define hil_writeb(v,p) gsc_writeb((v),(p)) + +#elif defined(CONFIG_HP300) + + #define HILBASE 0xf0428000UL /* HP300 (m68k) port address */ + #define HIL_DATA 0x1 + #define HIL_CMD 0x3 + #define HIL_IRQ 2 + #define hil_readb(p) readb((const volatile void __iomem *)(p)) + #define hil_writeb(v, p) writeb((v), (volatile void __iomem *)(p)) + +#else +#error "HIL is not supported on this platform" +#endif + + + +/* HIL helper functions */ + +#define hil_busy() (hil_readb(HILBASE + HIL_CMD) & HIL_BUSY) +#define hil_data_available() (hil_readb(HILBASE + HIL_CMD) & HIL_DATA_RDY) +#define hil_status() (hil_readb(HILBASE + HIL_CMD)) +#define hil_command(x) do { hil_writeb((x), HILBASE + HIL_CMD); } while (0) +#define hil_read_data() (hil_readb(HILBASE + HIL_DATA)) +#define hil_write_data(x) do { hil_writeb((x), HILBASE + HIL_DATA); } while (0) + +/* HIL constants */ + +#define HIL_BUSY 0x02 +#define HIL_DATA_RDY 0x01 + +#define HIL_SETARD 0xA0 /* set auto-repeat delay */ +#define HIL_SETARR 0xA2 /* set auto-repeat rate */ +#define HIL_SETTONE 0xA3 /* set tone generator */ +#define HIL_CNMT 0xB2 /* clear nmi */ +#define HIL_INTON 0x5C /* Turn on interrupts. */ +#define HIL_INTOFF 0x5D /* Turn off interrupts. */ + +#define HIL_READKBDSADR 0xF9 +#define HIL_WRITEKBDSADR 0xE9 + +static unsigned int hphilkeyb_keycode[HIL_KEYCODES_SET1_TBLSIZE] __read_mostly = + { HIL_KEYCODES_SET1 }; + +/* HIL structure */ +static struct { + struct input_dev *dev; + + unsigned int curdev; + + unsigned char s; + unsigned char c; + int valid; + + unsigned char data[16]; + unsigned int ptr; + spinlock_t lock; + + void *dev_id; /* native bus device */ +} hil_dev; + + +static void poll_finished(void) +{ + int down; + int key; + unsigned char scode; + + switch (hil_dev.data[0]) { + case 0x40: + down = (hil_dev.data[1] & 1) == 0; + scode = hil_dev.data[1] >> 1; + key = hphilkeyb_keycode[scode]; + input_report_key(hil_dev.dev, key, down); + break; + } + hil_dev.curdev = 0; +} + + +static inline void handle_status(unsigned char s, unsigned char c) +{ + if (c & 0x8) { + /* End of block */ + if (c & 0x10) + poll_finished(); + } else { + if (c & 0x10) { + if (hil_dev.curdev) + poll_finished(); /* just in case */ + hil_dev.curdev = c & 7; + hil_dev.ptr = 0; + } + } +} + + +static inline void handle_data(unsigned char s, unsigned char c) +{ + if (hil_dev.curdev) { + hil_dev.data[hil_dev.ptr++] = c; + hil_dev.ptr &= 15; + } +} + + +/* handle HIL interrupts */ +static irqreturn_t hil_interrupt(int irq, void *handle) +{ + unsigned char s, c; + + s = hil_status(); + c = hil_read_data(); + + switch (s >> 4) { + case 0x5: + handle_status(s, c); + break; + case 0x6: + handle_data(s, c); + break; + case 0x4: + hil_dev.s = s; + hil_dev.c = c; + mb(); + hil_dev.valid = 1; + break; + } + return IRQ_HANDLED; +} + + +/* send a command to the HIL */ +static void hil_do(unsigned char cmd, unsigned char *data, unsigned int len) +{ + unsigned long flags; + + spin_lock_irqsave(&hil_dev.lock, flags); + while (hil_busy()) + /* wait */; + hil_command(cmd); + while (len--) { + while (hil_busy()) + /* wait */; + hil_write_data(*(data++)); + } + spin_unlock_irqrestore(&hil_dev.lock, flags); +} + + +/* initialize HIL */ +static int hil_keyb_init(void) +{ + unsigned char c; + unsigned int i, kbid; + wait_queue_head_t hil_wait; + int err; + + if (hil_dev.dev) + return -ENODEV; /* already initialized */ + + init_waitqueue_head(&hil_wait); + spin_lock_init(&hil_dev.lock); + + hil_dev.dev = input_allocate_device(); + if (!hil_dev.dev) + return -ENOMEM; + + err = request_irq(HIL_IRQ, hil_interrupt, 0, "hil", hil_dev.dev_id); + if (err) { + printk(KERN_ERR "HIL: Can't get IRQ\n"); + goto err1; + } + + /* Turn on interrupts */ + hil_do(HIL_INTON, NULL, 0); + + /* Look for keyboards */ + hil_dev.valid = 0; /* clear any pending data */ + hil_do(HIL_READKBDSADR, NULL, 0); + + wait_event_interruptible_timeout(hil_wait, hil_dev.valid, 3 * HZ); + if (!hil_dev.valid) + printk(KERN_WARNING "HIL: timed out, assuming no keyboard present\n"); + + c = hil_dev.c; + hil_dev.valid = 0; + if (c == 0) { + kbid = -1; + printk(KERN_WARNING "HIL: no keyboard present\n"); + } else { + kbid = ffz(~c); + printk(KERN_INFO "HIL: keyboard found at id %d\n", kbid); + } + + /* set it to raw mode */ + c = 0; + hil_do(HIL_WRITEKBDSADR, &c, 1); + + for (i = 0; i < HIL_KEYCODES_SET1_TBLSIZE; i++) + if (hphilkeyb_keycode[i] != KEY_RESERVED) + __set_bit(hphilkeyb_keycode[i], hil_dev.dev->keybit); + + hil_dev.dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); + hil_dev.dev->ledbit[0] = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) | + BIT_MASK(LED_SCROLLL); + hil_dev.dev->keycodemax = HIL_KEYCODES_SET1_TBLSIZE; + hil_dev.dev->keycodesize= sizeof(hphilkeyb_keycode[0]); + hil_dev.dev->keycode = hphilkeyb_keycode; + hil_dev.dev->name = "HIL keyboard"; + hil_dev.dev->phys = "hpkbd/input0"; + + hil_dev.dev->id.bustype = BUS_HIL; + hil_dev.dev->id.vendor = PCI_VENDOR_ID_HP; + hil_dev.dev->id.product = 0x0001; + hil_dev.dev->id.version = 0x0010; + + err = input_register_device(hil_dev.dev); + if (err) { + printk(KERN_ERR "HIL: Can't register device\n"); + goto err2; + } + + printk(KERN_INFO "input: %s, ID %d at 0x%08lx (irq %d) found and attached\n", + hil_dev.dev->name, kbid, HILBASE, HIL_IRQ); + + return 0; + +err2: + hil_do(HIL_INTOFF, NULL, 0); + free_irq(HIL_IRQ, hil_dev.dev_id); +err1: + input_free_device(hil_dev.dev); + hil_dev.dev = NULL; + return err; +} + +static void hil_keyb_exit(void) +{ + if (HIL_IRQ) + free_irq(HIL_IRQ, hil_dev.dev_id); + + /* Turn off interrupts */ + hil_do(HIL_INTOFF, NULL, 0); + + input_unregister_device(hil_dev.dev); + hil_dev.dev = NULL; +} + +#if defined(CONFIG_PARISC) +static int __init hil_probe_chip(struct parisc_device *dev) +{ + /* Only allow one HIL keyboard */ + if (hil_dev.dev) + return -ENODEV; + + if (!dev->irq) { + printk(KERN_WARNING "HIL: IRQ not found for HIL bus at 0x%p\n", + (void *)dev->hpa.start); + return -ENODEV; + } + + hil_base = dev->hpa.start; + hil_irq = dev->irq; + hil_dev.dev_id = dev; + + printk(KERN_INFO "Found HIL bus at 0x%08lx, IRQ %d\n", hil_base, hil_irq); + + return hil_keyb_init(); +} + +static void __exit hil_remove_chip(struct parisc_device *dev) +{ + hil_keyb_exit(); +} + +static const struct parisc_device_id hil_tbl[] __initconst = { + { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00073 }, + { 0, } +}; + +#if 0 +/* Disabled to avoid conflicts with the HP SDC HIL drivers */ +MODULE_DEVICE_TABLE(parisc, hil_tbl); +#endif + +static struct parisc_driver hil_driver __refdata = { + .name = "hil", + .id_table = hil_tbl, + .probe = hil_probe_chip, + .remove = __exit_p(hil_remove_chip), +}; + +static int __init hil_init(void) +{ + return register_parisc_driver(&hil_driver); +} + +static void __exit hil_exit(void) +{ + unregister_parisc_driver(&hil_driver); +} + +#else /* !CONFIG_PARISC */ + +static int __init hil_init(void) +{ + int error; + + /* Only allow one HIL keyboard */ + if (hil_dev.dev) + return -EBUSY; + + if (!MACH_IS_HP300) + return -ENODEV; + + if (!hwreg_present((void *)(HILBASE + HIL_DATA))) { + printk(KERN_ERR "HIL: hardware register was not found\n"); + return -ENODEV; + } + + if (!request_region(HILBASE + HIL_DATA, 2, "hil")) { + printk(KERN_ERR "HIL: IOPORT region already used\n"); + return -EIO; + } + + error = hil_keyb_init(); + if (error) { + release_region(HILBASE + HIL_DATA, 2); + return error; + } + + return 0; +} + +static void __exit hil_exit(void) +{ + hil_keyb_exit(); + release_region(HILBASE + HIL_DATA, 2); +} + +#endif /* CONFIG_PARISC */ + +module_init(hil_init); +module_exit(hil_exit); |