// 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 <[email protected]> */ #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 { … }; enum ec_chan_t { … }; /* * EC events */ #define EVENT_AC_CHANGE … #define EVENT_BATTERY_STATUS … #define EVENT_BATTERY_CRITICAL … #define EVENT_BATTERY_SOC_CHANGE … #define EVENT_BATTERY_ERROR … #define EVENT_POWER_PRESSED … #define EVENT_POWER_PRESS_WAKE … #define EVENT_TIMED_HOST_WAKE … #define EVENT_OLS_HIGH_LIMIT … #define EVENT_OLS_LOW_LIMIT … /* * EC commands * (from http://dev.laptop.org/git/users/rsmith/ec-1.75/tree/ec_cmd.h) */ #define CMD_GET_API_VERSION … #define CMD_READ_VOLTAGE … #define CMD_READ_CURRENT … #define CMD_READ_ACR … #define CMD_READ_BATT_TEMPERATURE … #define CMD_READ_AMBIENT_TEMPERATURE … #define CMD_READ_BATTERY_STATUS … #define CMD_READ_SOC … #define CMD_READ_GAUGE_ID … #define CMD_READ_GAUGE_DATA … #define CMD_READ_BOARD_ID … #define CMD_READ_BATT_ERR_CODE … #define CMD_SET_DCON_POWER … #define CMD_RESET_EC … #define CMD_READ_BATTERY_TYPE … #define CMD_SET_AUTOWAK … #define CMD_SET_EC_WAKEUP_TIMER … #define CMD_READ_EXT_SCI_MASK … #define CMD_WRITE_EXT_SCI_MASK … #define CMD_CLEAR_EC_WAKEUP_TIMER … #define CMD_ENABLE_RUNIN_DISCHARGE … #define CMD_DISABLE_RUNIN_DISCHARGE … #define CMD_READ_MPPT_ACTIVE … #define CMD_READ_MPPT_LIMIT … #define CMD_SET_MPPT_LIMIT … #define CMD_DISABLE_MPPT … #define CMD_ENABLE_MPPT … #define CMD_READ_VIN … #define CMD_EXT_SCI_QUERY … #define RSP_KEYBOARD_DATA … #define RSP_TOUCHPAD_DATA … #define CMD_GET_FW_VERSION … #define CMD_POWER_CYCLE … #define CMD_POWER_OFF … #define CMD_RESET_EC_SOFT … #define CMD_READ_GAUGE_U16 … #define CMD_ENABLE_MOUSE … #define CMD_ECHO … #define CMD_GET_FW_DATE … #define CMD_GET_FW_USER … #define CMD_TURN_OFF_POWER … #define CMD_READ_OLS … #define CMD_OLS_SMT_LEDON … #define CMD_OLS_SMT_LEDOFF … #define CMD_START_OLS_ASSY … #define CMD_STOP_OLS_ASSY … #define CMD_OLS_SMTTEST_STOP … #define CMD_READ_VIN_SCALED … #define CMD_READ_BAT_MIN_W … #define CMD_READ_BAR_MAX_W … #define CMD_RESET_BAT_MINMAX_W … #define CMD_READ_LOCATION … #define CMD_WRITE_LOCATION … #define CMD_KEYBOARD_CMD … #define CMD_TOUCHPAD_CMD … #define CMD_GET_FW_HASH … #define CMD_SUSPEND_HINT … #define CMD_ENABLE_WAKE_TIMER … #define CMD_SET_WAKE_TIMER … #define CMD_ENABLE_WAKE_AUTORESET … #define CMD_OLS_SET_LIMITS … #define CMD_OLS_GET_LIMITS … #define CMD_OLS_SET_CEILING … #define CMD_OLS_GET_CEILING … /* * 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[] = …; #define EC_MAX_CMD_DATA_LEN … #define EC_MAX_RESP_LEN … #define LOG_BUF_SIZE … #define PM_WAKEUP_TIME … #define EC_ALL_EVENTS … enum ec_state_t { … }; struct olpc_xo175_ec_cmd { … }; struct olpc_xo175_ec_resp { … }; struct olpc_xo175_ec { … }; static struct platform_device *olpc_ec; static int olpc_xo175_ec_resp_len(u8 cmd) { … } static void olpc_xo175_ec_flush_logbuf(struct olpc_xo175_ec *priv) { … } 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) { … } static void olpc_xo175_ec_read_packet(struct olpc_xo175_ec *priv) { … } static void olpc_xo175_ec_complete(void *arg) { … } /* * 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) { … } static int olpc_xo175_ec_set_event_mask(unsigned int mask) { … } static void olpc_xo175_ec_power_off(void) { … } static int __maybe_unused olpc_xo175_ec_suspend(struct device *dev) { … } static int __maybe_unused olpc_xo175_ec_resume_noirq(struct device *dev) { … } static int __maybe_unused olpc_xo175_ec_resume(struct device *dev) { … } static struct olpc_ec_driver olpc_xo175_ec_driver = …; static void olpc_xo175_ec_remove(struct spi_device *spi) { … } static int olpc_xo175_ec_probe(struct spi_device *spi) { … } static const struct dev_pm_ops olpc_xo175_ec_pm_ops = …; static const struct of_device_id olpc_xo175_ec_of_match[] = …; MODULE_DEVICE_TABLE(of, olpc_xo175_ec_of_match); static const struct spi_device_id olpc_xo175_ec_id_table[] = …; MODULE_DEVICE_TABLE(spi, olpc_xo175_ec_id_table); static struct spi_driver olpc_xo175_ec_spi_driver = …; module_spi_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; /* Functionality */ MODULE_AUTHOR(…) …; /* Bugs */ MODULE_LICENSE(…) …;
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