456 lines
11 KiB
C
456 lines
11 KiB
C
/* $NetBSD: tcakp.c,v 1.17 2021/08/07 16:19:11 thorpej Exp $ */
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/*-
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* Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opt_fdt.h"
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tcakp.c,v 1.17 2021/08/07 16:19:11 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <sys/kmem.h>
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#include <sys/bitops.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/wscons/wsconsio.h>
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#include <dev/wscons/wskbdvar.h>
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#include <dev/wscons/wsksymdef.h>
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#include <dev/wscons/wsksymvar.h>
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#include <dev/wscons/linux_keymap.h>
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#ifdef FDT
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#include <dev/fdt/fdtvar.h>
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#endif
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#define TCA_MAX_ROWS 8
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#define TCA_MAX_COLS 10
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#define TCA_CFG 0x01
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#define CFG_AI __BIT(7)
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#define CFG_GPI_E_CFG __BIT(6)
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#define CFG_OVR_FLOW_M __BIT(5)
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#define CFG_INT_CFG __BIT(4)
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#define CFG_OVR_FLOW_IEN __BIT(3)
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#define CFG_K_LCK_IEN __BIT(2)
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#define CFG_GPI_IEN __BIT(1)
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#define CFG_KE_IEN __BIT(0)
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#define TCA_INT_STAT 0x02
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#define INT_STAT_CAD_INT __BIT(4)
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#define INT_STAT_OVR_FLOW_INT __BIT(3)
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#define INT_STAT_K_LCD_INT __BIT(2)
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#define INT_STAT_GPI_INT __BIT(1)
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#define INT_STAT_K_INT __BIT(0)
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#define TCA_KEY_LCK_EC 0x03
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#define KEY_LCK_EC_K_LCK_EN __BIT(6)
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#define KEY_LCK_EC_LCK2 __BIT(5)
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#define KEY_LCK_EC_LCK1 __BIT(4)
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#define KEY_LCK_EC_KEC __BITS(3,0)
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#define TCA_EVENT(c) (0x04 + (c) - 'A')
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#define TCA_EVENT_STATE __BIT(7)
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#define TCA_EVENT_CODE __BITS(6,0)
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#define TCA_KP_GPIO1 0x1d
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#define TCA_KP_GPIO2 0x1e
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#define TCA_KP_GPIO3 0x1f
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#define TCA_DEBOUNCE_DIS1 0x29
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#define TCA_DEBOUNCE_DIS2 0x2a
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#define TCA_DEBOUNCE_DIS3 0x2b
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struct tcakp_softc {
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device_t sc_dev;
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i2c_tag_t sc_i2c;
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i2c_addr_t sc_addr;
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int sc_phandle;
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u_int sc_rows;
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u_int sc_cols;
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bool sc_autorepeat;
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u_int sc_row_shift;
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uint16_t sc_keymap[128];
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void *sc_ih;
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void *sc_sih;
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int sc_enabled;
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device_t sc_wskbddev;
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};
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static int tcakp_match(device_t, cfdata_t, void *);
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static void tcakp_attach(device_t, device_t, void *);
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static int tcakp_i2c_lock(struct tcakp_softc *);
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static void tcakp_i2c_unlock(struct tcakp_softc *);
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static int tcakp_read(struct tcakp_softc *, uint8_t, uint8_t *);
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static int tcakp_write(struct tcakp_softc *, uint8_t, uint8_t);
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CFATTACH_DECL_NEW(tcakp, sizeof(struct tcakp_softc),
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tcakp_match, tcakp_attach, NULL, NULL);
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static const struct device_compatible_entry compat_data[] = {
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{ .compat = "ti,tca8418" },
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DEVICE_COMPAT_EOL
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};
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static u_int
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tcakp_decode(struct tcakp_softc *sc, uint8_t code)
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{
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u_int row = code / TCA_MAX_COLS;
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u_int col = code % TCA_MAX_COLS;
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if (col == 0) {
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row = row - 1;
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col = TCA_MAX_COLS - 1;
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} else {
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col = col - 1;
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}
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return (row << sc->sc_row_shift) + col;
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}
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static int
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tcakp_intr(void *priv)
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{
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struct tcakp_softc * const sc = priv;
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/*
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* Schedule our soft interrupt handler. We can't access the i2c
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* from hard interrupt context, so just go ahead and claim the
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* interrupt.
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*
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* XXX If we ever end up with an instance that uses
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* level-sensitive interrupts, we will need to mask
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* the interrupt source.
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*/
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softint_schedule(sc->sc_sih);
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return 1;
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}
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static void
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tcakp_softintr(void *priv)
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{
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struct tcakp_softc * const sc = priv;
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uint8_t stat, ev;
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if (tcakp_i2c_lock(sc) != 0)
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return;
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tcakp_read(sc, TCA_INT_STAT, &stat);
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if (stat & INT_STAT_K_INT) {
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tcakp_read(sc, TCA_EVENT('A'), &ev);
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while (ev != 0) {
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const bool pressed = __SHIFTOUT(ev, TCA_EVENT_STATE);
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const uint8_t code = __SHIFTOUT(ev, TCA_EVENT_CODE);
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tcakp_i2c_unlock(sc);
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/* Translate raw code to keymap index */
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const u_int index = tcakp_decode(sc, code);
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u_int type = pressed ? WSCONS_EVENT_KEY_DOWN :
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WSCONS_EVENT_KEY_UP;
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int key = linux_key_to_usb(sc->sc_keymap[index]);
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if (sc->sc_wskbddev)
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wskbd_input(sc->sc_wskbddev, type, key);
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if (tcakp_i2c_lock(sc) != 0)
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return;
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tcakp_read(sc, TCA_EVENT('A'), &ev);
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}
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}
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tcakp_write(sc, TCA_INT_STAT, stat);
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tcakp_i2c_unlock(sc);
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}
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static int
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tcakp_init(struct tcakp_softc *sc)
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{
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uint32_t mask;
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uint8_t val;
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int error;
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if (sc->sc_rows == 0 || sc->sc_cols == 0) {
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aprint_error_dev(sc->sc_dev, "not configured\n");
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return ENXIO;
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}
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mask = __BITS(sc->sc_rows - 1, 0);
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mask += __BITS(sc->sc_cols - 1, 0) << 8;
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error = tcakp_i2c_lock(sc);
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if (error)
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return error;
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/* Lock the keyboard */
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tcakp_write(sc, TCA_KEY_LCK_EC, KEY_LCK_EC_K_LCK_EN);
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/* Select keyboard mode */
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tcakp_write(sc, TCA_KP_GPIO1, (mask >> 0) & 0xff);
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tcakp_write(sc, TCA_KP_GPIO2, (mask >> 8) & 0xff);
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tcakp_write(sc, TCA_KP_GPIO3, (mask >> 16) & 0xff);
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/* Disable debounce */
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tcakp_write(sc, TCA_DEBOUNCE_DIS1, (mask >> 0) & 0xff);
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tcakp_write(sc, TCA_DEBOUNCE_DIS2, (mask >> 8) & 0xff);
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tcakp_write(sc, TCA_DEBOUNCE_DIS3, (mask >> 16) & 0xff);
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/* Enable key event interrupts */
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tcakp_write(sc, TCA_CFG, CFG_INT_CFG | CFG_KE_IEN);
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/* Clear interrupts */
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tcakp_read(sc, TCA_INT_STAT, &val);
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tcakp_write(sc, TCA_INT_STAT, val);
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tcakp_i2c_unlock(sc);
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return 0;
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}
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static void
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tcakp_configure_fdt(struct tcakp_softc *sc)
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{
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const uint32_t *keymap;
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int len;
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of_getprop_uint32(sc->sc_phandle, "keypad,num-rows", &sc->sc_rows);
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of_getprop_uint32(sc->sc_phandle, "keypad,num-columns", &sc->sc_cols);
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sc->sc_autorepeat = of_getprop_bool(sc->sc_phandle, "keypad,autorepeat");
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keymap = fdtbus_get_prop(sc->sc_phandle, "linux,keymap", &len);
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if (keymap == NULL || len <= 0)
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return;
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sc->sc_row_shift = fls32(sc->sc_cols) - 1;
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if (sc->sc_row_shift & (sc->sc_cols - 1))
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sc->sc_row_shift++;
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while (len >= 4) {
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const uint32_t e = be32toh(*keymap);
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const u_int row = (e >> 24) & 0xff;
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const u_int col = (e >> 16) & 0xff;
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const u_int index = (row << sc->sc_row_shift) + col;
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sc->sc_keymap[index] = e & 0xffff;
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len -= 4;
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keymap++;
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}
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}
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static int
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tcakp_enable(void *v, int on)
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{
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struct tcakp_softc * const sc = v;
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int error;
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error = tcakp_i2c_lock(sc);
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if (error)
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return error;
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if (on) {
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/* Disable key lock */
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tcakp_write(sc, TCA_KEY_LCK_EC, 0);
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} else {
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/* Enable key lock */
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tcakp_write(sc, TCA_KEY_LCK_EC, KEY_LCK_EC_K_LCK_EN);
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}
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tcakp_i2c_unlock(sc);
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return 0;
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}
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static void
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tcakp_set_leds(void *v, int leds)
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{
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}
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static int
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tcakp_ioctl(void *v, u_long cmd, void *data, int flag, lwp_t *l)
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{
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switch (cmd) {
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case WSKBDIO_GTYPE:
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*(int *)data = WSKBD_TYPE_USB;
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return 0;
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}
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return EPASSTHROUGH;
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}
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static const struct wskbd_accessops tcakp_accessops = {
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tcakp_enable,
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tcakp_set_leds,
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tcakp_ioctl,
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};
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#if notyet
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static void
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tcakp_cngetc(void *v, u_int *type, int *data)
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{
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struct tcakp_softc * const sc = v;
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uint8_t ev = 0;
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/* XXX i2c bus acquire */
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do {
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tcakp_read(sc, TCA_EVENT('A'), &ev);
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} while (ev == 0);
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const bool pressed = __SHIFTOUT(ev, TCA_EVENT_STATE);
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const uint8_t code = __SHIFTOUT(ev, TCA_EVENT_CODE);
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const u_int index = tcakp_decode(sc, code);
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*type = pressed ? WSCONS_EVENT_KEY_DOWN :
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WSCONS_EVENT_KEY_UP;
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*data = sc->sc_keymap[index];
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/* XXX i2c bus release */
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}
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static void
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tcakp_cnpollc(void *v, int on)
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{
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}
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static void
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tcakp_cnbell(void *v, u_int pitch, u_int period, u_int volume)
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{
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}
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static const struct wskbd_consops tcakp_consops = {
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tcakp_cngetc,
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tcakp_cnpollc,
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tcakp_cnbell,
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};
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#endif
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extern const struct wscons_keydesc hidkbd_keydesctab[];
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static const struct wskbd_mapdata tcakp_keymapdata = {
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hidkbd_keydesctab,
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KB_US,
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};
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static int
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tcakp_match(device_t parent, cfdata_t match, void *aux)
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{
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struct i2c_attach_args *ia = aux;
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int match_result;
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if (iic_use_direct_match(ia, match, compat_data, &match_result))
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return match_result;
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if (ia->ia_addr == 0x34)
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return I2C_MATCH_ADDRESS_ONLY;
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return 0;
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}
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static void
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tcakp_attach(device_t parent, device_t self, void *aux)
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{
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struct tcakp_softc * const sc = device_private(self);
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struct i2c_attach_args *ia = aux;
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struct wskbddev_attach_args a;
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sc->sc_dev = self;
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sc->sc_i2c = ia->ia_tag;
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sc->sc_addr = ia->ia_addr;
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sc->sc_phandle = ia->ia_cookie;
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aprint_naive("\n");
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aprint_normal(": TCA8418\n");
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#ifdef FDT
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sc->sc_ih = fdtbus_intr_establish(sc->sc_phandle, 0, IPL_VM, 0,
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tcakp_intr, sc);
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/*
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* XXX This is an edge-sensitive interrupt, but we'd like to
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* be able to check at run-time just to be sure.
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*/
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if (sc->sc_ih == NULL) {
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aprint_error_dev(sc->sc_dev, "unable to establish interrupt\n");
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return;
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}
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sc->sc_sih = softint_establish(SOFTINT_SERIAL, tcakp_softintr, sc);
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if (sc->sc_sih == NULL) {
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aprint_error_dev(sc->sc_dev,
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"unable to establish soft interrupt\n");
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return;
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}
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tcakp_configure_fdt(sc);
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#endif
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if (tcakp_init(sc) != 0)
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return;
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memset(&a, 0, sizeof(a));
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a.console = false; /* XXX */
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a.keymap = &tcakp_keymapdata;
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a.accessops = &tcakp_accessops;
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a.accesscookie = sc;
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sc->sc_wskbddev = config_found(self, &a, wskbddevprint, CFARGS_NONE);
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}
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static int
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tcakp_i2c_lock(struct tcakp_softc *sc)
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{
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int error;
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error = iic_acquire_bus(sc->sc_i2c, 0);
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if (error) {
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aprint_error_dev(sc->sc_dev,
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"unable to acquire bus lock (%d)\n", error);
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}
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return error;
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}
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static void
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tcakp_i2c_unlock(struct tcakp_softc *sc)
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{
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iic_release_bus(sc->sc_i2c, 0);
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}
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static int
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tcakp_read(struct tcakp_softc *sc, uint8_t reg, uint8_t *val)
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{
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return iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr,
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®, 1, val, 1, 0);
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}
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static int
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tcakp_write(struct tcakp_softc *sc, uint8_t reg, uint8_t val)
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{
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uint8_t buf[2] = { reg, val };
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return iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP,
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sc->sc_addr, NULL, 0, buf, 2, 0);
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}
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