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/* $OpenBSD: crosec.c,v 1.1 2015/01/26 02:48:24 bmercer Exp $ */
/*
* Copyright (c) 2013 Patrick Wildt <patrick@blueri.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/sensors.h>
#include <sys/malloc.h>
#include <armv7/exynos/crosecvar.h>
#ifdef DEBUG
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
int cros_ec_match(struct device *, void *, void *);
void cros_ec_attach(struct device *, struct device *, void *);
int cros_ec_send_command(struct cros_ec_softc *, uint8_t,
int, const void *, int, uint8_t **, int);
int cros_ec_command(struct cros_ec_softc *, uint8_t,
int, const void *, int, void *, int);
int cros_ec_command_inptr(struct cros_ec_softc *, uint8_t,
int, const void *, int, uint8_t **, int);
int cros_ec_i2c_command(struct cros_ec_softc *, uint8_t,
int, const uint8_t *, int, uint8_t **, int);
int cros_ec_calc_checksum(const uint8_t *, int);
struct cfattach crosec_ca = {
sizeof(struct cros_ec_softc), cros_ec_match, cros_ec_attach
};
struct cfdriver crosec_cd = {
NULL, "crosec", DV_DULL
};
int
cros_ec_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "crosec") == 0)
return 1;
return 0;
}
void
cros_ec_attach(struct device *parent, struct device *self, void *aux)
{
struct cros_ec_softc *sc = (struct cros_ec_softc *)self;
struct i2c_attach_args *ia = aux;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
printf("\n");
if (cros_ec_check_version(sc)) {
printf("%s: could not initialize ChromeOS EC\n", __func__);
return;
}
if (cros_ec_init_keyboard(sc)) {
printf("%s: could not initialize keyboard\n", __func__);
return;
}
}
int
cros_ec_check_version(struct cros_ec_softc *sc)
{
struct ec_params_hello req;
struct ec_response_hello *resp;
sc->cmd_version_is_supported = 1;
if (cros_ec_command_inptr(sc, EC_CMD_HELLO, 0, &req, sizeof(req),
(uint8_t **)&resp, sizeof(*resp)) > 0) {
/* new version supported */
sc->cmd_version_is_supported = 1;
} else {
printf("%s: old EC interface not supported\n", __func__);
return -1;
}
return 0;
}
int
cros_ec_i2c_command(struct cros_ec_softc *sc, uint8_t cmd, int cmd_version,
const uint8_t *out, int out_len, uint8_t **in, int in_len)
{
int out_bytes, in_bytes, ret;
uint8_t *ptr = sc->out;
uint8_t *inptr = sc->in;
inptr += sizeof(uint64_t); /* returned data should be 64-bit aligned */
if (!sc->cmd_version_is_supported) {
/* old-style */
*ptr++ = cmd;
out_bytes = out_len + 1;
in_bytes = in_len + 2;
inptr--; /* status byte */
} else {
/* new-style */
*ptr++ = EC_CMD_VERSION0 + cmd_version;
*ptr++ = cmd;
*ptr++ = out_len;
out_bytes = out_len + 4;
in_bytes = in_len + 3;
inptr -= 2; /* status byte, length */
}
memcpy(ptr, out, out_len);
ptr += out_len;
if (sc->cmd_version_is_supported)
*ptr++ = (uint8_t)
cros_ec_calc_checksum(sc->out, out_len + 3);
iic_acquire_bus(sc->sc_tag, 0);
ret = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, NULL, 0, &sc->out, out_bytes, 0);
if (ret) {
DPRINTF(("%s: I2C write failed\n", __func__));
iic_release_bus(sc->sc_tag, 0);
return -1;
}
ret = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, NULL, 0, inptr, in_bytes, 0);
if (ret) {
DPRINTF(("%s: I2C read failed\n", __func__));
iic_release_bus(sc->sc_tag, 0);
return -1;
}
iic_release_bus(sc->sc_tag, 0);
if (*inptr != EC_RES_SUCCESS) {
DPRINTF(("%s: bad result\n", __func__));
return -(int)*inptr;
}
if (sc->cmd_version_is_supported) {
int len, csum;
len = inptr[1];
if (len > sizeof(sc->in)) {
DPRINTF(("%s: Received length too large\n", __func__));
return -1;
}
csum = cros_ec_calc_checksum(inptr, 2 + len);
if (csum != inptr[2 + len]) {
DPRINTF(("%s: Invalid checksum\n", __func__));
return -1;
}
in_len = min(in_len, len);
}
*in = sc->in + sizeof(uint64_t);
return in_len;
}
int
cros_ec_send_command(struct cros_ec_softc *sc, uint8_t cmd, int cmd_version,
const void *out, int out_len, uint8_t **in, int in_len)
{
return cros_ec_i2c_command(sc, cmd, cmd_version,
(const uint8_t *)out, out_len, in, in_len);
}
int
cros_ec_command(struct cros_ec_softc *sc, uint8_t cmd,
int cmd_version, const void *out, int out_len,
void *in, int in_len) {
uint8_t *in_buffer;
int len;
len = cros_ec_command_inptr(sc, cmd, cmd_version, out, out_len,
&in_buffer, in_len);
if (len > 0) {
if (in && in_buffer) {
len = min(in_len, len);
memmove(in, in_buffer, len);
}
}
return len;
}
int
cros_ec_command_inptr(struct cros_ec_softc *sc, uint8_t cmd,
int cmd_version, const void *out, int out_len,
uint8_t **inp, int in_len) {
uint8_t *in;
int len;
len = cros_ec_send_command(sc, cmd, cmd_version,
(const uint8_t *)out, out_len, &in, in_len);
/* Wait for the command to complete. */
if (len == -EC_RES_IN_PROGRESS) {
struct ec_response_get_comms_status *resp;
do {
int ret;
delay(50000);
cros_ec_send_command(sc, EC_CMD_GET_COMMS_STATUS, 0,
NULL, 0,
(uint8_t **)&resp, sizeof(*resp));
if (ret < 0)
return ret;
//timeout CROS_EC_CMD_TIMEOUT_MS
//return -EC_RES_TIMEOUT
} while (resp->flags & EC_COMMS_STATUS_PROCESSING);
/* Let's get the response. */
len = cros_ec_send_command(sc, EC_CMD_RESEND_RESPONSE, 0,
out, out_len, &in, in_len);
}
if (inp != NULL)
*inp = in;
return len;
}
int
cros_ec_calc_checksum(const uint8_t *data, int size)
{
int csum, i;
for (i = csum = 0; i < size; i++)
csum += data[i];
return csum & 0xff;
}
int
cros_ec_scan_keyboard(struct cros_ec_softc *sc, uint8_t *scan, int len)
{
if (cros_ec_command(sc, EC_CMD_CROS_EC_STATE, 0, NULL, 0, scan,
len) < len)
return -1;
return 0;
}
int
cros_ec_info(struct cros_ec_softc *sc, struct ec_response_cros_ec_info *info)
{
if (cros_ec_command(sc, EC_CMD_CROS_EC_INFO, 0, NULL, 0, info,
sizeof(*info)) < sizeof(*info))
return -1;
return 0;
}
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