linux/drivers/platform/olpc/olpc-xo175-ec.c
Lubomir Rintel fd43f16cca Platform: OLPC: Fix olpc_xo175_ec_cmd() return value
Reset the ret variable to make sure it olpc_xo175_ec_cmd() ends up
returning zero on success.

Fixes: 0c3d931b3a ("Platform: OLPC: Add XO-1.75 EC driver")
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
2019-06-12 11:53:10 +03:00

754 lines
20 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for the OLPC XO-1.75 Embedded Controller.
*
* The EC protocol is documented at:
* http://wiki.laptop.org/go/XO_1.75_HOST_to_EC_Protocol
*
* Copyright (C) 2010 One Laptop per Child Foundation.
* Copyright (C) 2018 Lubomir Rintel <lkundrak@v3.sk>
*/
#include <linux/completion.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/input.h>
#include <linux/kfifo.h>
#include <linux/module.h>
#include <linux/olpc-ec.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/spi/spi.h>
struct ec_cmd_t {
u8 cmd;
u8 bytes_returned;
};
enum ec_chan_t {
CHAN_NONE = 0,
CHAN_SWITCH,
CHAN_CMD_RESP,
CHAN_KEYBOARD,
CHAN_TOUCHPAD,
CHAN_EVENT,
CHAN_DEBUG,
CHAN_CMD_ERROR,
};
/*
* EC events
*/
#define EVENT_AC_CHANGE 1 /* AC plugged/unplugged */
#define EVENT_BATTERY_STATUS 2 /* Battery low/full/error/gone */
#define EVENT_BATTERY_CRITICAL 3 /* Battery critical voltage */
#define EVENT_BATTERY_SOC_CHANGE 4 /* 1% SOC Change */
#define EVENT_BATTERY_ERROR 5 /* Abnormal error, query for cause */
#define EVENT_POWER_PRESSED 6 /* Power button was pressed */
#define EVENT_POWER_PRESS_WAKE 7 /* Woken up with a power button */
#define EVENT_TIMED_HOST_WAKE 8 /* Host wake timer */
#define EVENT_OLS_HIGH_LIMIT 9 /* OLS crossed dark threshold */
#define EVENT_OLS_LOW_LIMIT 10 /* OLS crossed light threshold */
/*
* EC commands
* (from http://dev.laptop.org/git/users/rsmith/ec-1.75/tree/ec_cmd.h)
*/
#define CMD_GET_API_VERSION 0x08 /* out: u8 */
#define CMD_READ_VOLTAGE 0x10 /* out: u16, *9.76/32, mV */
#define CMD_READ_CURRENT 0x11 /* out: s16, *15.625/120, mA */
#define CMD_READ_ACR 0x12 /* out: s16, *6250/15, uAh */
#define CMD_READ_BATT_TEMPERATURE 0x13 /* out: u16, *100/256, deg C */
#define CMD_READ_AMBIENT_TEMPERATURE 0x14 /* unimplemented, no hardware */
#define CMD_READ_BATTERY_STATUS 0x15 /* out: u8, bitmask */
#define CMD_READ_SOC 0x16 /* out: u8, percentage */
#define CMD_READ_GAUGE_ID 0x17 /* out: u8 * 8 */
#define CMD_READ_GAUGE_DATA 0x18 /* in: u8 addr, out: u8 data */
#define CMD_READ_BOARD_ID 0x19 /* out: u16 (platform id) */
#define CMD_READ_BATT_ERR_CODE 0x1f /* out: u8, error bitmask */
#define CMD_SET_DCON_POWER 0x26 /* in: u8 */
#define CMD_RESET_EC 0x28 /* none */
#define CMD_READ_BATTERY_TYPE 0x2c /* out: u8 */
#define CMD_SET_AUTOWAK 0x33 /* out: u8 */
#define CMD_SET_EC_WAKEUP_TIMER 0x36 /* in: u32, out: ? */
#define CMD_READ_EXT_SCI_MASK 0x37 /* ? */
#define CMD_WRITE_EXT_SCI_MASK 0x38 /* ? */
#define CMD_CLEAR_EC_WAKEUP_TIMER 0x39 /* none */
#define CMD_ENABLE_RUNIN_DISCHARGE 0x3B /* none */
#define CMD_DISABLE_RUNIN_DISCHARGE 0x3C /* none */
#define CMD_READ_MPPT_ACTIVE 0x3d /* out: u8 */
#define CMD_READ_MPPT_LIMIT 0x3e /* out: u8 */
#define CMD_SET_MPPT_LIMIT 0x3f /* in: u8 */
#define CMD_DISABLE_MPPT 0x40 /* none */
#define CMD_ENABLE_MPPT 0x41 /* none */
#define CMD_READ_VIN 0x42 /* out: u16 */
#define CMD_EXT_SCI_QUERY 0x43 /* ? */
#define RSP_KEYBOARD_DATA 0x48 /* ? */
#define RSP_TOUCHPAD_DATA 0x49 /* ? */
#define CMD_GET_FW_VERSION 0x4a /* out: u8 * 16 */
#define CMD_POWER_CYCLE 0x4b /* none */
#define CMD_POWER_OFF 0x4c /* none */
#define CMD_RESET_EC_SOFT 0x4d /* none */
#define CMD_READ_GAUGE_U16 0x4e /* ? */
#define CMD_ENABLE_MOUSE 0x4f /* ? */
#define CMD_ECHO 0x52 /* in: u8 * 5, out: u8 * 5 */
#define CMD_GET_FW_DATE 0x53 /* out: u8 * 16 */
#define CMD_GET_FW_USER 0x54 /* out: u8 * 16 */
#define CMD_TURN_OFF_POWER 0x55 /* none (same as 0x4c) */
#define CMD_READ_OLS 0x56 /* out: u16 */
#define CMD_OLS_SMT_LEDON 0x57 /* none */
#define CMD_OLS_SMT_LEDOFF 0x58 /* none */
#define CMD_START_OLS_ASSY 0x59 /* none */
#define CMD_STOP_OLS_ASSY 0x5a /* none */
#define CMD_OLS_SMTTEST_STOP 0x5b /* none */
#define CMD_READ_VIN_SCALED 0x5c /* out: u16 */
#define CMD_READ_BAT_MIN_W 0x5d /* out: u16 */
#define CMD_READ_BAR_MAX_W 0x5e /* out: u16 */
#define CMD_RESET_BAT_MINMAX_W 0x5f /* none */
#define CMD_READ_LOCATION 0x60 /* in: u16 addr, out: u8 data */
#define CMD_WRITE_LOCATION 0x61 /* in: u16 addr, u8 data */
#define CMD_KEYBOARD_CMD 0x62 /* in: u8, out: ? */
#define CMD_TOUCHPAD_CMD 0x63 /* in: u8, out: ? */
#define CMD_GET_FW_HASH 0x64 /* out: u8 * 16 */
#define CMD_SUSPEND_HINT 0x65 /* in: u8 */
#define CMD_ENABLE_WAKE_TIMER 0x66 /* in: u8 */
#define CMD_SET_WAKE_TIMER 0x67 /* in: 32 */
#define CMD_ENABLE_WAKE_AUTORESET 0x68 /* in: u8 */
#define CMD_OLS_SET_LIMITS 0x69 /* in: u16, u16 */
#define CMD_OLS_GET_LIMITS 0x6a /* out: u16, u16 */
#define CMD_OLS_SET_CEILING 0x6b /* in: u16 */
#define CMD_OLS_GET_CEILING 0x6c /* out: u16 */
/*
* Accepted EC commands, and how many bytes they return. There are plenty
* of EC commands that are no longer implemented, or are implemented only on
* certain older boards.
*/
static const struct ec_cmd_t olpc_xo175_ec_cmds[] = {
{ CMD_GET_API_VERSION, 1 },
{ CMD_READ_VOLTAGE, 2 },
{ CMD_READ_CURRENT, 2 },
{ CMD_READ_ACR, 2 },
{ CMD_READ_BATT_TEMPERATURE, 2 },
{ CMD_READ_BATTERY_STATUS, 1 },
{ CMD_READ_SOC, 1 },
{ CMD_READ_GAUGE_ID, 8 },
{ CMD_READ_GAUGE_DATA, 1 },
{ CMD_READ_BOARD_ID, 2 },
{ CMD_READ_BATT_ERR_CODE, 1 },
{ CMD_SET_DCON_POWER, 0 },
{ CMD_RESET_EC, 0 },
{ CMD_READ_BATTERY_TYPE, 1 },
{ CMD_ENABLE_RUNIN_DISCHARGE, 0 },
{ CMD_DISABLE_RUNIN_DISCHARGE, 0 },
{ CMD_READ_MPPT_ACTIVE, 1 },
{ CMD_READ_MPPT_LIMIT, 1 },
{ CMD_SET_MPPT_LIMIT, 0 },
{ CMD_DISABLE_MPPT, 0 },
{ CMD_ENABLE_MPPT, 0 },
{ CMD_READ_VIN, 2 },
{ CMD_GET_FW_VERSION, 16 },
{ CMD_POWER_CYCLE, 0 },
{ CMD_POWER_OFF, 0 },
{ CMD_RESET_EC_SOFT, 0 },
{ CMD_ECHO, 5 },
{ CMD_GET_FW_DATE, 16 },
{ CMD_GET_FW_USER, 16 },
{ CMD_TURN_OFF_POWER, 0 },
{ CMD_READ_OLS, 2 },
{ CMD_OLS_SMT_LEDON, 0 },
{ CMD_OLS_SMT_LEDOFF, 0 },
{ CMD_START_OLS_ASSY, 0 },
{ CMD_STOP_OLS_ASSY, 0 },
{ CMD_OLS_SMTTEST_STOP, 0 },
{ CMD_READ_VIN_SCALED, 2 },
{ CMD_READ_BAT_MIN_W, 2 },
{ CMD_READ_BAR_MAX_W, 2 },
{ CMD_RESET_BAT_MINMAX_W, 0 },
{ CMD_READ_LOCATION, 1 },
{ CMD_WRITE_LOCATION, 0 },
{ CMD_GET_FW_HASH, 16 },
{ CMD_SUSPEND_HINT, 0 },
{ CMD_ENABLE_WAKE_TIMER, 0 },
{ CMD_SET_WAKE_TIMER, 0 },
{ CMD_ENABLE_WAKE_AUTORESET, 0 },
{ CMD_OLS_SET_LIMITS, 0 },
{ CMD_OLS_GET_LIMITS, 4 },
{ CMD_OLS_SET_CEILING, 0 },
{ CMD_OLS_GET_CEILING, 2 },
{ CMD_READ_EXT_SCI_MASK, 2 },
{ CMD_WRITE_EXT_SCI_MASK, 0 },
{ }
};
#define EC_MAX_CMD_DATA_LEN 5
#define EC_MAX_RESP_LEN 16
#define LOG_BUF_SIZE 128
#define PM_WAKEUP_TIME 1000
#define EC_ALL_EVENTS GENMASK(15, 0)
enum ec_state_t {
CMD_STATE_IDLE = 0,
CMD_STATE_WAITING_FOR_SWITCH,
CMD_STATE_CMD_IN_TX_FIFO,
CMD_STATE_CMD_SENT,
CMD_STATE_RESP_RECEIVED,
CMD_STATE_ERROR_RECEIVED,
};
struct olpc_xo175_ec_cmd {
u8 command;
u8 nr_args;
u8 data_len;
u8 args[EC_MAX_CMD_DATA_LEN];
};
struct olpc_xo175_ec_resp {
u8 channel;
u8 byte;
};
struct olpc_xo175_ec {
bool suspended;
/* SPI related stuff. */
struct spi_device *spi;
struct spi_transfer xfer;
struct spi_message msg;
union {
struct olpc_xo175_ec_cmd cmd;
struct olpc_xo175_ec_resp resp;
} tx_buf, rx_buf;
/* GPIO for the CMD signals. */
struct gpio_desc *gpio_cmd;
/* Command handling related state. */
spinlock_t cmd_state_lock;
int cmd_state;
bool cmd_running;
struct completion cmd_done;
struct olpc_xo175_ec_cmd cmd;
u8 resp_data[EC_MAX_RESP_LEN];
int expected_resp_len;
int resp_len;
/* Power button. */
struct input_dev *pwrbtn;
/* Debug handling. */
char logbuf[LOG_BUF_SIZE];
int logbuf_len;
};
static struct platform_device *olpc_ec;
static int olpc_xo175_ec_resp_len(u8 cmd)
{
const struct ec_cmd_t *p;
for (p = olpc_xo175_ec_cmds; p->cmd; p++) {
if (p->cmd == cmd)
return p->bytes_returned;
}
return -EINVAL;
}
static void olpc_xo175_ec_flush_logbuf(struct olpc_xo175_ec *priv)
{
dev_dbg(&priv->spi->dev, "got debug string [%*pE]\n",
priv->logbuf_len, priv->logbuf);
priv->logbuf_len = 0;
}
static void olpc_xo175_ec_complete(void *arg);
static void olpc_xo175_ec_send_command(struct olpc_xo175_ec *priv, void *cmd,
size_t cmdlen)
{
int ret;
memcpy(&priv->tx_buf, cmd, cmdlen);
priv->xfer.len = cmdlen;
spi_message_init_with_transfers(&priv->msg, &priv->xfer, 1);
priv->msg.complete = olpc_xo175_ec_complete;
priv->msg.context = priv;
ret = spi_async(priv->spi, &priv->msg);
if (ret)
dev_err(&priv->spi->dev, "spi_async() failed %d\n", ret);
}
static void olpc_xo175_ec_read_packet(struct olpc_xo175_ec *priv)
{
u8 nonce[] = {0xA5, 0x5A};
olpc_xo175_ec_send_command(priv, nonce, sizeof(nonce));
}
static void olpc_xo175_ec_complete(void *arg)
{
struct olpc_xo175_ec *priv = arg;
struct device *dev = &priv->spi->dev;
struct power_supply *psy;
unsigned long flags;
u8 channel;
u8 byte;
int ret;
ret = priv->msg.status;
if (ret) {
dev_err(dev, "SPI transfer failed: %d\n", ret);
spin_lock_irqsave(&priv->cmd_state_lock, flags);
if (priv->cmd_running) {
priv->resp_len = 0;
priv->cmd_state = CMD_STATE_ERROR_RECEIVED;
complete(&priv->cmd_done);
}
spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
if (ret != -EINTR)
olpc_xo175_ec_read_packet(priv);
return;
}
channel = priv->rx_buf.resp.channel;
byte = priv->rx_buf.resp.byte;
switch (channel) {
case CHAN_NONE:
spin_lock_irqsave(&priv->cmd_state_lock, flags);
if (!priv->cmd_running) {
/* We can safely ignore these */
dev_err(dev, "spurious FIFO read packet\n");
spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
return;
}
priv->cmd_state = CMD_STATE_CMD_SENT;
if (!priv->expected_resp_len)
complete(&priv->cmd_done);
olpc_xo175_ec_read_packet(priv);
spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
return;
case CHAN_SWITCH:
spin_lock_irqsave(&priv->cmd_state_lock, flags);
if (!priv->cmd_running) {
/* Just go with the flow */
dev_err(dev, "spurious SWITCH packet\n");
memset(&priv->cmd, 0, sizeof(priv->cmd));
priv->cmd.command = CMD_ECHO;
}
priv->cmd_state = CMD_STATE_CMD_IN_TX_FIFO;
/* Throw command into TxFIFO */
gpiod_set_value_cansleep(priv->gpio_cmd, 0);
olpc_xo175_ec_send_command(priv, &priv->cmd, sizeof(priv->cmd));
spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
return;
case CHAN_CMD_RESP:
spin_lock_irqsave(&priv->cmd_state_lock, flags);
if (!priv->cmd_running) {
dev_err(dev, "spurious response packet\n");
} else if (priv->resp_len >= priv->expected_resp_len) {
dev_err(dev, "too many response packets\n");
} else {
priv->resp_data[priv->resp_len++] = byte;
if (priv->resp_len == priv->expected_resp_len) {
priv->cmd_state = CMD_STATE_RESP_RECEIVED;
complete(&priv->cmd_done);
}
}
spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
break;
case CHAN_CMD_ERROR:
spin_lock_irqsave(&priv->cmd_state_lock, flags);
if (!priv->cmd_running) {
dev_err(dev, "spurious cmd error packet\n");
} else {
priv->resp_data[0] = byte;
priv->resp_len = 1;
priv->cmd_state = CMD_STATE_ERROR_RECEIVED;
complete(&priv->cmd_done);
}
spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
break;
case CHAN_KEYBOARD:
dev_warn(dev, "keyboard is not supported\n");
break;
case CHAN_TOUCHPAD:
dev_warn(dev, "touchpad is not supported\n");
break;
case CHAN_EVENT:
dev_dbg(dev, "got event %.2x\n", byte);
switch (byte) {
case EVENT_AC_CHANGE:
psy = power_supply_get_by_name("olpc-ac");
if (psy) {
power_supply_changed(psy);
power_supply_put(psy);
}
break;
case EVENT_BATTERY_STATUS:
case EVENT_BATTERY_CRITICAL:
case EVENT_BATTERY_SOC_CHANGE:
case EVENT_BATTERY_ERROR:
psy = power_supply_get_by_name("olpc-battery");
if (psy) {
power_supply_changed(psy);
power_supply_put(psy);
}
break;
case EVENT_POWER_PRESSED:
input_report_key(priv->pwrbtn, KEY_POWER, 1);
input_sync(priv->pwrbtn);
input_report_key(priv->pwrbtn, KEY_POWER, 0);
input_sync(priv->pwrbtn);
/* fall through */
case EVENT_POWER_PRESS_WAKE:
case EVENT_TIMED_HOST_WAKE:
pm_wakeup_event(priv->pwrbtn->dev.parent,
PM_WAKEUP_TIME);
break;
default:
dev_dbg(dev, "ignored unknown event %.2x\n", byte);
break;
}
break;
case CHAN_DEBUG:
if (byte == '\n') {
olpc_xo175_ec_flush_logbuf(priv);
} else if (isprint(byte)) {
priv->logbuf[priv->logbuf_len++] = byte;
if (priv->logbuf_len == LOG_BUF_SIZE)
olpc_xo175_ec_flush_logbuf(priv);
}
break;
default:
dev_warn(dev, "unknown channel: %d, %.2x\n", channel, byte);
break;
}
/* Most non-command packets get the TxFIFO refilled and an ACK. */
olpc_xo175_ec_read_packet(priv);
}
/*
* This function is protected with a mutex. We can safely assume that
* there will be only one instance of this function running at a time.
* One of the ways in which we enforce this is by waiting until we get
* all response bytes back from the EC, rather than just the number that
* the caller requests (otherwise, we might start a new command while an
* old command's response bytes are still incoming).
*/
static int olpc_xo175_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *resp,
size_t resp_len, void *ec_cb_arg)
{
struct olpc_xo175_ec *priv = ec_cb_arg;
struct device *dev = &priv->spi->dev;
unsigned long flags;
size_t nr_bytes;
int ret = 0;
dev_dbg(dev, "CMD %x, %zd bytes expected\n", cmd, resp_len);
if (inlen > 5) {
dev_err(dev, "command len %zd too big!\n", resp_len);
return -EOVERFLOW;
}
/* Suspending in the middle of an EC command hoses things badly! */
if (WARN_ON(priv->suspended))
return -EBUSY;
/* Ensure a valid command and return bytes */
ret = olpc_xo175_ec_resp_len(cmd);
if (ret < 0) {
dev_err_ratelimited(dev, "unknown command 0x%x\n", cmd);
/*
* Assume the best in our callers, and allow unknown commands
* through. I'm not the charitable type, but it was beaten
* into me. Just maintain a minimum standard of sanity.
*/
if (resp_len > sizeof(priv->resp_data)) {
dev_err(dev, "response too big: %zd!\n", resp_len);
return -EOVERFLOW;
}
nr_bytes = resp_len;
} else {
nr_bytes = (size_t)ret;
ret = 0;
}
resp_len = min(resp_len, nr_bytes);
spin_lock_irqsave(&priv->cmd_state_lock, flags);
/* Initialize the state machine */
init_completion(&priv->cmd_done);
priv->cmd_running = true;
priv->cmd_state = CMD_STATE_WAITING_FOR_SWITCH;
memset(&priv->cmd, 0, sizeof(priv->cmd));
priv->cmd.command = cmd;
priv->cmd.nr_args = inlen;
priv->cmd.data_len = 0;
memcpy(priv->cmd.args, inbuf, inlen);
priv->expected_resp_len = nr_bytes;
priv->resp_len = 0;
/* Tickle the cmd gpio to get things started */
gpiod_set_value_cansleep(priv->gpio_cmd, 1);
spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
/* The irq handler should do the rest */
if (!wait_for_completion_timeout(&priv->cmd_done,
msecs_to_jiffies(4000))) {
dev_err(dev, "EC cmd error: timeout in STATE %d\n",
priv->cmd_state);
gpiod_set_value_cansleep(priv->gpio_cmd, 0);
spi_slave_abort(priv->spi);
olpc_xo175_ec_read_packet(priv);
return -ETIMEDOUT;
}
spin_lock_irqsave(&priv->cmd_state_lock, flags);
/* Deal with the results. */
if (priv->cmd_state == CMD_STATE_ERROR_RECEIVED) {
/* EC-provided error is in the single response byte */
dev_err(dev, "command 0x%x returned error 0x%x\n",
cmd, priv->resp_data[0]);
ret = -EREMOTEIO;
} else if (priv->resp_len != nr_bytes) {
dev_err(dev, "command 0x%x returned %d bytes, expected %zd bytes\n",
cmd, priv->resp_len, nr_bytes);
ret = -EREMOTEIO;
} else {
/*
* We may have 8 bytes in priv->resp, but we only care about
* what we've been asked for. If the caller asked for only 2
* bytes, give them that. We've guaranteed that
* resp_len <= priv->resp_len and priv->resp_len == nr_bytes.
*/
memcpy(resp, priv->resp_data, resp_len);
}
/* This should already be low, but just in case. */
gpiod_set_value_cansleep(priv->gpio_cmd, 0);
priv->cmd_running = false;
spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
return ret;
}
static int olpc_xo175_ec_set_event_mask(unsigned int mask)
{
u8 args[2];
args[0] = mask >> 0;
args[1] = mask >> 8;
return olpc_ec_cmd(CMD_WRITE_EXT_SCI_MASK, args, 2, NULL, 0);
}
static void olpc_xo175_ec_power_off(void)
{
while (1) {
olpc_ec_cmd(CMD_POWER_OFF, NULL, 0, NULL, 0);
mdelay(1000);
}
}
static int __maybe_unused olpc_xo175_ec_suspend(struct device *dev)
{
struct olpc_xo175_ec *priv = dev_get_drvdata(dev);
static struct {
u8 suspend;
u32 suspend_count;
} __packed hintargs;
static unsigned int suspend_count;
/*
* SOC_SLEEP is not wired to the EC on B3 and earlier boards.
* This command lets the EC know instead. The suspend count doesn't seem
* to be used anywhere but in the EC debug output.
*/
hintargs.suspend = 1;
hintargs.suspend_count = suspend_count++;
olpc_ec_cmd(CMD_SUSPEND_HINT, (void *)&hintargs, sizeof(hintargs),
NULL, 0);
/*
* After we've sent the suspend hint, don't allow further EC commands
* to be run until we've resumed. Userspace tasks should be frozen,
* but kernel threads and interrupts could still schedule EC commands.
*/
priv->suspended = true;
return 0;
}
static int __maybe_unused olpc_xo175_ec_resume_noirq(struct device *dev)
{
struct olpc_xo175_ec *priv = dev_get_drvdata(dev);
priv->suspended = false;
return 0;
}
static int __maybe_unused olpc_xo175_ec_resume(struct device *dev)
{
u8 x = 0;
/*
* The resume hint is only needed if no other commands are
* being sent during resume. all it does is tell the EC
* the SoC is definitely awake.
*/
olpc_ec_cmd(CMD_SUSPEND_HINT, &x, 1, NULL, 0);
/* Enable all EC events while we're awake */
olpc_xo175_ec_set_event_mask(EC_ALL_EVENTS);
return 0;
}
static struct olpc_ec_driver olpc_xo175_ec_driver = {
.ec_cmd = olpc_xo175_ec_cmd,
};
static int olpc_xo175_ec_remove(struct spi_device *spi)
{
if (pm_power_off == olpc_xo175_ec_power_off)
pm_power_off = NULL;
spi_slave_abort(spi);
platform_device_unregister(olpc_ec);
olpc_ec = NULL;
return 0;
}
static int olpc_xo175_ec_probe(struct spi_device *spi)
{
struct olpc_xo175_ec *priv;
int ret;
if (olpc_ec) {
dev_err(&spi->dev, "OLPC EC already registered.\n");
return -EBUSY;
}
priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->gpio_cmd = devm_gpiod_get(&spi->dev, "cmd", GPIOD_OUT_LOW);
if (IS_ERR(priv->gpio_cmd)) {
dev_err(&spi->dev, "failed to get cmd gpio: %ld\n",
PTR_ERR(priv->gpio_cmd));
return PTR_ERR(priv->gpio_cmd);
}
priv->spi = spi;
spin_lock_init(&priv->cmd_state_lock);
priv->cmd_state = CMD_STATE_IDLE;
init_completion(&priv->cmd_done);
priv->logbuf_len = 0;
/* Set up power button input device */
priv->pwrbtn = devm_input_allocate_device(&spi->dev);
if (!priv->pwrbtn)
return -ENOMEM;
priv->pwrbtn->name = "Power Button";
priv->pwrbtn->dev.parent = &spi->dev;
input_set_capability(priv->pwrbtn, EV_KEY, KEY_POWER);
ret = input_register_device(priv->pwrbtn);
if (ret) {
dev_err(&spi->dev, "error registering input device: %d\n", ret);
return ret;
}
spi_set_drvdata(spi, priv);
priv->xfer.rx_buf = &priv->rx_buf;
priv->xfer.tx_buf = &priv->tx_buf;
olpc_xo175_ec_read_packet(priv);
olpc_ec_driver_register(&olpc_xo175_ec_driver, priv);
olpc_ec = platform_device_register_resndata(&spi->dev, "olpc-ec", -1,
NULL, 0, NULL, 0);
/* Enable all EC events while we're awake */
olpc_xo175_ec_set_event_mask(EC_ALL_EVENTS);
if (pm_power_off == NULL)
pm_power_off = olpc_xo175_ec_power_off;
dev_info(&spi->dev, "OLPC XO-1.75 Embedded Controller driver\n");
return 0;
}
static const struct dev_pm_ops olpc_xo175_ec_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, olpc_xo175_ec_resume_noirq)
SET_RUNTIME_PM_OPS(olpc_xo175_ec_suspend, olpc_xo175_ec_resume, NULL)
};
static const struct of_device_id olpc_xo175_ec_of_match[] = {
{ .compatible = "olpc,xo1.75-ec" },
{ }
};
MODULE_DEVICE_TABLE(of, olpc_xo175_ec_of_match);
static struct spi_driver olpc_xo175_ec_spi_driver = {
.driver = {
.name = "olpc-xo175-ec",
.of_match_table = olpc_xo175_ec_of_match,
.pm = &olpc_xo175_ec_pm_ops,
},
.probe = olpc_xo175_ec_probe,
.remove = olpc_xo175_ec_remove,
};
module_spi_driver(olpc_xo175_ec_spi_driver);
MODULE_DESCRIPTION("OLPC XO-1.75 Embedded Controller driver");
MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); /* Functionality */
MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>"); /* Bugs */
MODULE_LICENSE("GPL");