// 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 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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 "); /* Functionality */ MODULE_AUTHOR("Lubomir Rintel "); /* Bugs */ MODULE_LICENSE("GPL");