/*
 * oFono - Open Source Telephony
 * Copyright (C) 2008-2011  Intel Corporation
 *
 * SPDX-License-Identifier: GPL-2.0-only
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <errno.h>
#include <termios.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <glib.h>
#include <gatchat.h>
#include <gattty.h>
#include <gatmux.h>

#define OFONO_API_SUBJECT_TO_CHANGE
#include <ofono/plugin.h>
#include <ofono/log.h>
#include <ofono/modem.h>
#include <ofono/call-barring.h>
#include <ofono/call-forwarding.h>
#include <ofono/call-meter.h>
#include <ofono/call-settings.h>
#include <ofono/call-volume.h>
#include <ofono/devinfo.h>
#include <ofono/message-waiting.h>
#include <ofono/netreg.h>
#include <ofono/phonebook.h>
#include <ofono/sim.h>
#include <ofono/sms.h>
#include <ofono/ussd.h>
#include <ofono/voicecall.h>
#include <ofono/stk.h>

#include <drivers/atmodem/vendor.h>

#define CALYPSO_POWER_PATH "/sys/bus/platform/devices/gta02-pm-gsm.0/power_on"
#define CALYPSO_RESET_PATH "/sys/bus/platform/devices/gta02-pm-gsm.0/reset"

enum powercycle_state {
	POWERCYCLE_STATE_POWER0 = 0,
	POWERCYCLE_STATE_RESET0,
	POWERCYCLE_STATE_POWER1,
	POWERCYCLE_STATE_RESET1,
	POWERCYCLE_STATE_FINISHED,
};

#define NUM_DLC 4

#define VOICE_DLC   0
#define NETREG_DLC  1
#define SMS_DLC     2
#define AUX_DLC     3
#define SETUP_DLC   3

static char *debug_prefixes[NUM_DLC] = { "Voice: ", "Net: ", "SMS: ", "Aux: " };

struct calypso_data {
	GAtMux *mux;
	GAtChat *dlcs[NUM_DLC];
	enum powercycle_state state;
	gboolean phonebook_added;
	gboolean sms_added;
	gboolean have_sim;
	struct ofono_sim *sim;
};

static const char *cpin_prefix[] = { "+CPIN:", NULL };
static const char *none_prefix[] = { NULL };

static void calypso_debug(const char *str, void *user_data)
{
	const char *prefix = user_data;

	ofono_info("%s%s", prefix, str);
}

static int calypso_probe(struct ofono_modem *modem)
{
	const char *device;
	struct calypso_data *data;

	DBG("%p", modem);

	device = ofono_modem_get_string(modem, "Device");
	if (device == NULL)
		return -EINVAL;

	DBG("%s", device);

	data = g_new0(struct calypso_data, 1);

	ofono_modem_set_data(modem, data);

	return 0;
}

static void calypso_remove(struct ofono_modem *modem)
{
	struct calypso_data *data = ofono_modem_get_data(modem);

	DBG("%p", modem);

	g_free(data);
}

static void cstat_notify(GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	struct calypso_data *data = ofono_modem_get_data(modem);
	GAtResultIter iter;
	const char *stat;
	int enabled;

	DBG("phonebook: %d, sms: %d", data->phonebook_added, data->sms_added);

	g_at_result_iter_init(&iter, result);

	if (!g_at_result_iter_next(&iter, "%CSTAT:"))
		return;

	if (!g_at_result_iter_next_unquoted_string(&iter, &stat))
		return;

	if (!g_at_result_iter_next_number(&iter, &enabled))
		return;

	DBG("stat: %s, enabled: %d", stat, enabled);

	if (!g_strcmp0(stat, "PHB") && enabled == 1 && !data->phonebook_added) {
		data->phonebook_added = TRUE;
		ofono_phonebook_create(modem, 0, "atmodem",
					data->dlcs[AUX_DLC]);
	}

	if (!g_strcmp0(stat, "SMS") && enabled == 1 && !data->sms_added) {
		data->sms_added = TRUE;
		ofono_sms_create(modem, 0, "atmodem", data->dlcs[SMS_DLC]);
	}
}

static void simind_notify(GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	struct calypso_data *data = ofono_modem_get_data(modem);
	GAtResultIter iter;

	if (data->sim == NULL)
		return;

	g_at_result_iter_init(&iter, result);

	if (g_at_result_iter_next(&iter, "%SIMREM:"))
		ofono_sim_inserted_notify(data->sim, FALSE);
	else if (g_at_result_iter_next(&iter, "%SIMINS:"))
		ofono_sim_inserted_notify(data->sim, TRUE);
}

static void setup_modem(struct ofono_modem *modem)
{
	struct calypso_data *data = ofono_modem_get_data(modem);
	int i;

	/* Generate unsolicited notifications as soon as they're generated */
	for (i = 0; i < NUM_DLC; i++) {
		g_at_chat_send(data->dlcs[i], "ATE0", NULL, NULL, NULL, NULL);
		g_at_chat_send(data->dlcs[i], "AT%CUNS=0",
				NULL, NULL, NULL, NULL);
		g_at_chat_send(data->dlcs[i], "AT+CMEE=1",
				NULL, NULL, NULL, NULL);
	}

	/* CSTAT tells us when SMS & Phonebook are ready to be used */
	g_at_chat_register(data->dlcs[SETUP_DLC], "%CSTAT:", cstat_notify,
				FALSE, modem, NULL);
	g_at_chat_send(data->dlcs[SETUP_DLC], "AT%CSTAT=1", NULL,
				NULL, NULL, NULL);

	/* audio side tone: set to minimum */
	g_at_chat_send(data->dlcs[SETUP_DLC], "AT@ST=\"-26\"", NULL,
			NULL, NULL, NULL);

	/* Disable deep sleep */
	g_at_chat_send(data->dlcs[SETUP_DLC], "AT%SLEEP=2", NULL,
			NULL, NULL, NULL);

	/* Enable SIM removed/inserted notifications */
	g_at_chat_register(data->dlcs[SETUP_DLC], "%SIMREM:", simind_notify,
				FALSE, modem, NULL);
	g_at_chat_register(data->dlcs[SETUP_DLC], "%SIMINS:", simind_notify,
				FALSE, modem, NULL);
	g_at_chat_send(data->dlcs[SETUP_DLC], "AT%SIMIND=1", NULL,
				NULL, NULL, NULL);
}

static void simpin_check_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	struct calypso_data *data = ofono_modem_get_data(modem);

	DBG("");

	/* Modem returns ERROR if there is no SIM in slot. */
	data->have_sim = ok;

	setup_modem(modem);

	ofono_modem_set_powered(modem, TRUE);
}

static void init_simpin_check(struct ofono_modem *modem)
{
	struct calypso_data *data = ofono_modem_get_data(modem);

	/*
	 * Check for SIM presence by seeing if AT+CPIN? succeeds.
	 * The SIM can not be practically inserted/removed without
	 * restarting the device so there's no need to check more
	 * than once.
	 */
	g_at_chat_send(data->dlcs[SETUP_DLC], "AT+CPIN?", cpin_prefix,
			simpin_check_cb, modem, NULL);
}

static void mux_setup(GAtMux *mux, gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	struct calypso_data *data = ofono_modem_get_data(modem);
	GIOChannel *io;
	GAtSyntax *syntax;
	int i;

	DBG("%p", mux);

	if (mux == NULL) {
		ofono_modem_set_powered(modem, FALSE);
		return;
	}

	data->mux = mux;

	if (getenv("OFONO_AT_DEBUG"))
		g_at_mux_set_debug(data->mux, calypso_debug, "MUX: ");

	g_at_mux_start(mux);

	for (i = 0; i < NUM_DLC; i++) {
		io = g_at_mux_create_channel(mux);

		syntax = g_at_syntax_new_gsm_permissive();
		data->dlcs[i] = g_at_chat_new(io, syntax);
		g_at_syntax_unref(syntax);
		g_io_channel_unref(io);

		if (getenv("OFONO_AT_DEBUG"))
			g_at_chat_set_debug(data->dlcs[i], calypso_debug,
							debug_prefixes[i]);

		g_at_chat_set_wakeup_command(data->dlcs[i], "AT\r", 500, 5000);
	}

	init_simpin_check(modem);
}

static void modem_initialize(struct ofono_modem *modem)
{
	GAtSyntax *syntax;
	GAtChat *chat;
	const char *device;
	GIOChannel *io;
	GHashTable *options;

	DBG("");

	device = ofono_modem_get_string(modem, "Device");

	options = g_hash_table_new(g_str_hash, g_str_equal);
	if (options == NULL)
		goto error;

	g_hash_table_insert(options, "Baud", "115200");
	g_hash_table_insert(options, "Parity", "none");
	g_hash_table_insert(options, "StopBits", "1");
	g_hash_table_insert(options, "DataBits", "8");
	g_hash_table_insert(options, "XonXoff", "on");
	g_hash_table_insert(options, "Local", "on");
	g_hash_table_insert(options, "RtsCts", "on");

	io = g_at_tty_open(device, options);
	g_hash_table_destroy(options);

	if (io == NULL)
		goto error;

	/* Calypso is normally compliant to 27.007, except the vendor-specific
	 * notifications (like %CSTAT) are not prefixed by \r\n
	 */
	syntax = g_at_syntax_new_gsm_permissive();
	chat = g_at_chat_new(io, syntax);
	g_at_syntax_unref(syntax);
	g_io_channel_unref(io);

	if (chat == NULL)
		goto error;

	if (getenv("OFONO_AT_DEBUG") != NULL)
		g_at_chat_set_debug(chat, calypso_debug, "Setup: ");

	g_at_chat_set_wakeup_command(chat, "AT\r", 500, 5000);

	g_at_chat_send(chat, "ATE0", NULL, NULL, NULL, NULL);

	g_at_mux_setup_gsm0710(chat, mux_setup, modem, NULL);
	g_at_chat_unref(chat);

	return;

error:
	ofono_modem_set_powered(modem, FALSE);
}

static gboolean write_file(const char *file, gboolean on)
{
	int fd;
	int r;

	fd = open(file, O_WRONLY);

	if (fd == -1)
		return FALSE;

	DBG("%s, %s", file, on ? "1" : "0");

	if (on)
		r = write(fd, "1\n", 2);
	else
		r = write(fd, "0\n", 2);

	close(fd);

	return r > 0 ? TRUE : FALSE;
}

static gboolean poweron_cycle(gpointer user_data)
{
	struct ofono_modem *modem = user_data;
	struct calypso_data *data = ofono_modem_get_data(modem);

	switch (data->state) {
	case POWERCYCLE_STATE_POWER0:
		if (write_file(CALYPSO_RESET_PATH, FALSE)) {
			data->state = POWERCYCLE_STATE_RESET0;
			return TRUE;
		}

		break;

	case POWERCYCLE_STATE_RESET0:
		if (write_file(CALYPSO_POWER_PATH, TRUE)) {
			data->state = POWERCYCLE_STATE_POWER1;
			return TRUE;
		}

		break;

	case POWERCYCLE_STATE_POWER1:
		if (write_file(CALYPSO_RESET_PATH, TRUE)) {
			data->state = POWERCYCLE_STATE_RESET1;
			return TRUE;
		}

		break;

	case POWERCYCLE_STATE_RESET1:
		if (write_file(CALYPSO_RESET_PATH, FALSE)) {
			data->state = POWERCYCLE_STATE_FINISHED;
			return TRUE;
		}

		break;

	case POWERCYCLE_STATE_FINISHED:
		modem_initialize(modem);
		return FALSE;

	default:
		break;
	};

	ofono_modem_set_powered(modem, FALSE);
	return FALSE;
}

/* power up hardware */
static int calypso_enable(struct ofono_modem *modem)
{
	struct calypso_data *data = ofono_modem_get_data(modem);

	DBG("%p", modem);

	if (write_file(CALYPSO_POWER_PATH, FALSE) == FALSE)
		return -EINVAL;

	data->state = POWERCYCLE_STATE_POWER0;
	g_timeout_add_seconds(1, poweron_cycle, modem);

	return -EINPROGRESS;
}

static int calypso_disable(struct ofono_modem *modem)
{
	struct calypso_data *data = ofono_modem_get_data(modem);
	int i;

	DBG("%p", modem);

	for (i = 0; i < NUM_DLC; i++) {
		g_at_chat_unref(data->dlcs[i]);
		data->dlcs[i] = NULL;
	}

	g_at_mux_shutdown(data->mux);
	g_at_mux_unref(data->mux);
	data->mux = NULL;

	data->phonebook_added = FALSE;
	data->sms_added = FALSE;

	if (write_file(CALYPSO_POWER_PATH, FALSE))
		return 0;

	return -EINVAL;
}

static void calypso_pre_sim(struct ofono_modem *modem)
{
	struct calypso_data *data = ofono_modem_get_data(modem);

	DBG("%p", modem);

	ofono_devinfo_create(modem, 0, "atmodem", data->dlcs[AUX_DLC]);
	data->sim = ofono_sim_create(modem, 0, "atmodem", data->dlcs[AUX_DLC]);
	ofono_voicecall_create(modem, 0, "calypsomodem", data->dlcs[VOICE_DLC]);

	/*
	 * The STK atom is only useful after SIM has been initialised,
	 * so really it belongs in post_sim.  However, the order of the
	 * following three actions is adapted to work around different
	 * issues with the Calypso's firmware in its different versions
	 * (may have been fixed starting at some version, but this order
	 * should work with any version).
	 *
	 * To deal with PIN-enabled and PIN-disabled SIM cards, the order
	 * needs to be as follows:
	 *
	 * AT%SATC="..."
	 * ...
	 * AT+CFUN=1
	 * ...
	 * AT+CPIN="..."
	 *
	 * %SATC comes before the other two actions because it provides
	 * the Terminal Profile data to the modem, which will be used
	 * during the Profile Download either during +CFUN=1 (on
	 * unprotected cards) or +CPIN="..." (on protected cards).
	 * The STK atom needs to be present at this time because the
	 * card may start issuing proactive commands immediately after
	 * the Download.
	 *
	 * +CFUN=1 appears before PIN entry because switching from +CFUN
	 * mode 0 later, on the Calypso has side effects at least on some
	 * versions of the firmware:
	 *
	 * mode 0 -> 1 transition forces PIN re-authentication.
	 * mode 0 -> 4 doesn't work at all.
	 * mode 1 -> 4 and
	 * mode 4 -> 1 transitions work and have no side effects.
	 *
	 * So in order to switch to Offline mode at startup,
	 * AT+CFUN=1;+CFUN=4 would be needed.
	 *
	 * Additionally AT+CFUN=1 response is not checked: on PIN-enabled
	 * cards, it will in most situations return "+CME ERROR: SIM PIN
	 * required" (CME ERROR 11) even though the switch to mode 1
	 * succeeds.  It will not perform Profile Download on those cards
	 * though, until another +CPIN command.
	 */
	if (data->have_sim && data->sim)
		ofono_stk_create(modem, 0, "calypsomodem", data->dlcs[AUX_DLC]);

	g_at_chat_send(data->dlcs[AUX_DLC], "AT+CFUN=1",
			none_prefix, NULL, NULL, NULL);

	if (data->have_sim && data->sim)
		ofono_sim_inserted_notify(data->sim, TRUE);
}

static void calypso_post_sim(struct ofono_modem *modem)
{
	struct calypso_data *data = ofono_modem_get_data(modem);
	struct ofono_message_waiting *mw;

	DBG("%p", modem);

	ofono_ussd_create(modem, 0, "atmodem", data->dlcs[AUX_DLC]);
	ofono_call_forwarding_create(modem, 0, "atmodem", data->dlcs[AUX_DLC]);
	ofono_call_settings_create(modem, 0, "atmodem", data->dlcs[AUX_DLC]);
	ofono_netreg_create(modem, OFONO_VENDOR_CALYPSO, "atmodem",
				data->dlcs[NETREG_DLC]);
	ofono_call_meter_create(modem, 0, "atmodem", data->dlcs[AUX_DLC]);
	ofono_call_barring_create(modem, 0, "atmodem", data->dlcs[AUX_DLC]);
	ofono_call_volume_create(modem, 0, "atmodem", data->dlcs[AUX_DLC]);

	mw = ofono_message_waiting_create(modem);
	if (mw)
		ofono_message_waiting_register(mw);
}

static struct ofono_modem_driver calypso_driver = {
	.probe		= calypso_probe,
	.remove		= calypso_remove,
	.enable		= calypso_enable,
	.disable	= calypso_disable,
	.pre_sim	= calypso_pre_sim,
	.post_sim	= calypso_post_sim,
};

OFONO_MODEM_DRIVER_BUILTIN(calypso, &calypso_driver)
