From a607edde7251b573d84f7e0286d60138ecb5bc21 Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Wed, 12 May 2010 14:22:36 +0200
Subject: [PATCH] Add n516 lpc driver

---
 drivers/misc/Kconfig    |    8 +
 drivers/misc/Makefile   |    1 +
 drivers/misc/n516-lpc.c |  471 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 480 insertions(+), 0 deletions(-)
 create mode 100644 drivers/misc/n516-lpc.c

--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -353,6 +353,14 @@ config VMWARE_BALLOON
 	  To compile this driver as a module, choose M here: the
 	  module will be called vmware_balloon.
 
+config N516_LPC
+	tristate "N516 keys & power controller"
+	depends on I2C
+	depends on INPUT
+	depends on POWER_SUPPLY
+	help
+	  N516 keyboard & power controller driver
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -31,3 +31,4 @@ obj-$(CONFIG_IWMC3200TOP)      += iwmc32
 obj-y				+= eeprom/
 obj-y				+= cb710/
 obj-$(CONFIG_VMWARE_BALLOON)	+= vmware_balloon.o
+obj-$(CONFIG_N516_LPC)		+= n516-lpc.o
--- /dev/null
+++ b/drivers/misc/n516-lpc.c
@@ -0,0 +1,471 @@
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/sched.h>
+#include <linux/pm.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/power_supply.h>
+#include <linux/suspend.h>
+
+#include <linux/i2c.h>
+
+#include <asm/mach-jz4740/irq.h>
+#include <asm/mach-jz4740/gpio.h>
+#include <asm/mach-jz4740/board-n516.h>
+
+static int batt_level=0;
+module_param(batt_level, int, 0);
+
+struct n516_lpc_chip {
+	struct i2c_client	*i2c_client;
+	struct input_dev	*input;
+	unsigned int		battery_level;
+	unsigned int		suspending:1, can_sleep:1;
+};
+
+static struct n516_lpc_chip *the_lpc;
+
+struct i2c_device_id n516_lpc_i2c_ids[] = {
+	{"LPC524", 0},
+	{},
+};
+
+MODULE_DEVICE_TABLE(i2c, n516_lpc_i2c_ids);
+
+static const unsigned short normal_i2c[] = I2C_ADDRS(0x54);
+
+static const unsigned int n516_lpc_keymap[] = {
+	[0x01] = KEY_4,
+	[0x02] = KEY_3,
+	[0x03] = KEY_2,
+	[0x04] = KEY_1,
+	[0x05] = KEY_0,
+	[0x07] = KEY_9,
+	[0x08] = KEY_8,
+	[0x09] = KEY_7,
+	[0x0a] = KEY_6,
+	[0x0b] = KEY_5,
+	[0x0d] = KEY_PLAYPAUSE,
+	[0x0e] = KEY_MENU,
+	[0x0f] = KEY_SEARCH,
+	[0x10] = KEY_DIRECTION,
+	[0x11] = KEY_SPACE,
+	[0x13] = KEY_ENTER,
+	[0x14] = KEY_UP,
+	[0x15] = KEY_DOWN,
+	[0x16] = KEY_RIGHT,
+	[0x17] = KEY_LEFT,
+	[0x19] = KEY_PAGEDOWN,
+	[0x1a] = KEY_PAGEUP,
+	[0x1c] = KEY_POWER,
+	[0x1d] = KEY_ESC,
+	[0x1e] = KEY_SLEEP,
+	[0x1f] = KEY_WAKEUP,
+};
+
+static const unsigned int batt_charge[] = {0, 7, 20, 45, 65, 80, 100};
+#define MAX_BAT_LEVEL	6
+
+static inline int n516_bat_charging(void)
+{
+	return !gpio_get_value(GPIO_CHARG_STAT_N);
+}
+
+static int n516_bat_get_status(struct power_supply *b)
+{
+	if (power_supply_am_i_supplied(b)) {
+		if (n516_bat_charging())
+			return POWER_SUPPLY_STATUS_CHARGING;
+		else
+			return POWER_SUPPLY_STATUS_FULL;
+	} else {
+		return POWER_SUPPLY_STATUS_DISCHARGING;
+	}
+}
+
+static int n516_bat_get_charge(struct power_supply *b)
+{
+	return batt_charge[the_lpc->battery_level];
+}
+
+static int n516_bat_get_property(struct power_supply *b,
+		enum power_supply_property psp,
+		union power_supply_propval *val)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = n516_bat_get_status(b);
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+		val->intval = 100;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
+		val->intval = 0;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_NOW:
+		val->intval = n516_bat_get_charge(b);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void n516_bat_power_changed(struct power_supply *p)
+{
+	if (power_supply_am_i_supplied(p) && !n516_bat_charging())
+		the_lpc->battery_level = MAX_BAT_LEVEL;
+
+	power_supply_changed(p);
+}
+
+static enum power_supply_property n516_bat_properties[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+};
+
+static struct power_supply n516_battery = {
+	.name		= "n516-battery",
+	.get_property	= n516_bat_get_property,
+	.properties	= n516_bat_properties,
+	.num_properties	= ARRAY_SIZE(n516_bat_properties),
+	.external_power_changed = n516_bat_power_changed,
+};
+
+static irqreturn_t n516_bat_charge_irq(int irq, void *dev)
+{
+	struct power_supply *psy = dev;
+
+	dev_dbg(psy->dev, "Battery charging IRQ\n");
+
+	if (power_supply_am_i_supplied(psy) && !n516_bat_charging())
+		the_lpc->battery_level = MAX_BAT_LEVEL;
+
+	power_supply_changed(psy);
+
+	return IRQ_HANDLED;
+}
+
+static int n516_lpc_send_message(struct n516_lpc_chip *chip, unsigned char val)
+{
+	struct i2c_client *client = chip->i2c_client;
+	struct i2c_msg msg = {client->addr, client->flags, 1, &val};
+	int ret = 0;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	return ret > 0 ? 0 : ret;
+}
+
+static void n516_key_event(struct n516_lpc_chip *chip, unsigned char keycode)
+{
+	struct i2c_client *client = chip->i2c_client;
+	bool long_press = false;
+
+	if (keycode & 0x40) {
+		keycode &= ~0x40;
+		long_press = true;
+	}
+
+	dev_dbg(&client->dev, "keycode: 0x%02x, long_press: 0x%02x\n", keycode, (unsigned int)long_press);
+
+	if (keycode >= ARRAY_SIZE(n516_lpc_keymap) || n516_lpc_keymap[keycode] == 0)
+		return;
+
+	if (long_press)
+		input_report_key(chip->input, KEY_LEFTALT, 1);
+
+	input_report_key(chip->input, n516_lpc_keymap[keycode], 1);
+	input_sync(chip->input);
+	input_report_key(chip->input, n516_lpc_keymap[keycode], 0);
+
+	if (long_press)
+		input_report_key(chip->input, KEY_LEFTALT, 0);
+	input_sync(chip->input);
+}
+
+static void n516_battery_event(struct n516_lpc_chip *chip, unsigned char battery_level)
+{
+	if (battery_level != chip->battery_level) {
+		chip->battery_level = battery_level;
+		power_supply_changed(&n516_battery);
+	}
+}
+
+static irqreturn_t n516_lpc_irq_thread(int irq, void *devid)
+{
+	struct n516_lpc_chip *chip = (struct n516_lpc_chip*)devid;
+	int ret;
+	unsigned char raw_msg;
+	struct i2c_client *client = chip->i2c_client;
+	struct i2c_msg msg = {client->addr, client->flags | I2C_M_RD, 1, &raw_msg};
+
+	if (client->dev.power.status >= DPM_OFF)
+		return IRQ_HANDLED;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret != 1) {
+		dev_dbg(&client->dev, "I2C error: %d\n", ret);
+		return IRQ_HANDLED;
+	}
+
+	dev_dbg(&client->dev, "msg: 0x%02x\n", raw_msg);
+
+	/* Ack wakeup event */
+	if ((raw_msg & ~0x40) < ARRAY_SIZE(n516_lpc_keymap))
+		n516_key_event(chip, raw_msg);
+	else if ((raw_msg >= 0x81) && (raw_msg <= 0x87))
+		n516_battery_event(chip, raw_msg - 0x81);
+	else if (raw_msg == 0x7e)
+		n516_lpc_send_message(chip, 0x00);
+	else
+		dev_warn(&client->dev, "Unknown message: %x\n", raw_msg);
+
+	if (chip->suspending)
+		chip->can_sleep = 0;
+
+	return IRQ_HANDLED;
+}
+
+static void n516_lpc_power_off(void)
+{
+	struct i2c_client *client = the_lpc->i2c_client;
+	unsigned char val = 0x01;
+	struct i2c_msg msg = {client->addr, client->flags, 1, &val};
+
+	printk("Issue LPC POWEROFF command...\n");
+	while (1)
+		i2c_transfer(client->adapter, &msg, 1);
+}
+
+static int n516_lpc_detect(struct i2c_client *client, struct i2c_board_info *info)
+{
+	return 0;
+}
+
+static int n516_lpc_suspend_notifier(struct notifier_block *nb,
+		                                unsigned long event,
+						void *dummy)
+{
+	switch(event) {
+	case PM_SUSPEND_PREPARE:
+		the_lpc->suspending = 1;
+		the_lpc->can_sleep = 1;
+		break;
+	case PM_POST_SUSPEND:
+		the_lpc->suspending = 0;
+		the_lpc->can_sleep = 1;
+		break;
+	default:
+		return NOTIFY_DONE;
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block n516_lpc_notif_block = {
+	.notifier_call = n516_lpc_suspend_notifier,
+};
+
+static int __devinit n516_lpc_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	struct n516_lpc_chip *chip;
+	struct input_dev *input;
+	int ret = 0;
+	int i;
+
+	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	the_lpc = chip;
+	chip->i2c_client = client;
+	if ((batt_level > 0) && (batt_level < ARRAY_SIZE(batt_charge)))
+		chip->battery_level = batt_level;
+	else
+		chip->battery_level = 1;
+
+	i2c_set_clientdata(client, chip);
+
+	ret = gpio_request(GPIO_LPC_INT, "LPC interrupt request");
+	if (ret) {
+		dev_err(&client->dev, "Unable to reguest LPC INT GPIO\n");
+		goto err_gpio_req_lpcint;
+	}
+
+	ret = gpio_request(GPIO_CHARG_STAT_N, "LPC charging status");
+	if (ret) {
+		dev_err(&client->dev, "Unable to reguest CHARG STAT GPIO\n");
+		goto err_gpio_req_chargstat;
+	}
+
+	/* Enter normal mode */
+	n516_lpc_send_message(chip, 0x2);
+
+	input = input_allocate_device();
+	if (!input) {
+		dev_err(&client->dev, "Unable to allocate input device\n");
+		ret = -ENOMEM;
+		goto err_input_alloc;
+	}
+
+	chip->input = input;
+
+	__set_bit(EV_KEY, input->evbit);
+
+	for (i = 0; i < ARRAY_SIZE(n516_lpc_keymap); i++)
+		__set_bit(n516_lpc_keymap[i], input->keybit);
+
+	__set_bit(KEY_LEFTALT, input->keybit);
+
+	input->name = "n516-keys";
+	input->phys = "n516-keys/input0";
+	input->dev.parent = &client->dev;
+	input->id.bustype = BUS_I2C;
+	input->id.vendor = 0x0001;
+	input->id.product = 0x0001;
+	input->id.version = 0x0100;
+
+	ret = input_register_device(input);
+	if (ret < 0) {
+		dev_err(&client->dev, "Unable to register input device\n");
+		goto err_input_register;
+	}
+
+	ret = power_supply_register(NULL, &n516_battery);
+	if (ret) {
+		dev_err(&client->dev, "Unable to register N516 battery\n");
+		goto err_bat_reg;
+	}
+
+	ret = request_threaded_irq(gpio_to_irq(GPIO_LPC_INT), NULL,
+					n516_lpc_irq_thread,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					"lpc", chip);
+	if (ret) {
+		dev_err(&client->dev, "request_irq failed: %d\n", ret);
+		goto err_request_lpc_irq;
+	}
+
+	ret = request_irq(gpio_to_irq(GPIO_CHARG_STAT_N), n516_bat_charge_irq,
+				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+				"battery charging", &n516_battery);
+	if (ret) {
+		dev_err(&client->dev, "Unable to claim battery charging IRQ\n");
+		goto err_request_chrg_irq;
+	}
+
+	pm_power_off = n516_lpc_power_off;
+	ret = register_pm_notifier(&n516_lpc_notif_block);
+	if (ret) {
+		dev_err(&client->dev, "Unable to register PM notify block\n");
+		goto err_reg_pm_notifier;
+	}
+
+	device_init_wakeup(&client->dev, 1);
+
+	return 0;
+
+	unregister_pm_notifier(&n516_lpc_notif_block);
+err_reg_pm_notifier:
+	free_irq(gpio_to_irq(GPIO_CHARG_STAT_N), &n516_battery);
+err_request_chrg_irq:
+	free_irq(gpio_to_irq(GPIO_LPC_INT), chip);
+err_request_lpc_irq:
+	power_supply_unregister(&n516_battery);
+err_bat_reg:
+	input_unregister_device(input);
+err_input_register:
+	input_free_device(input);
+err_input_alloc:
+	gpio_free(GPIO_CHARG_STAT_N);
+err_gpio_req_chargstat:
+	gpio_free(GPIO_LPC_INT);
+err_gpio_req_lpcint:
+	i2c_set_clientdata(client, NULL);
+	kfree(chip);
+
+	return ret;
+}
+
+static int __devexit n516_lpc_remove(struct i2c_client *client)
+{
+	struct n516_lpc_chip *chip = i2c_get_clientdata(client);
+
+	unregister_pm_notifier(&n516_lpc_notif_block);
+	pm_power_off = NULL;
+	free_irq(gpio_to_irq(GPIO_CHARG_STAT_N), &n516_battery);
+	free_irq(gpio_to_irq(GPIO_LPC_INT), chip);
+	power_supply_unregister(&n516_battery);
+	input_unregister_device(chip->input);
+	gpio_free(GPIO_CHARG_STAT_N);
+	gpio_free(GPIO_LPC_INT);
+	i2c_set_clientdata(client, NULL);
+	kfree(chip);
+
+	return 0;
+}
+
+#if CONFIG_PM
+static int n516_lpc_suspend(struct i2c_client *client, pm_message_t msg)
+{
+	if (!the_lpc->can_sleep)
+		return -EBUSY;
+
+	if (device_may_wakeup(&client->dev))
+		enable_irq_wake(gpio_to_irq(GPIO_LPC_INT));
+
+	return 0;
+}
+
+static int n516_lpc_resume(struct i2c_client *client)
+{
+	if (device_may_wakeup(&client->dev))
+		disable_irq_wake(gpio_to_irq(GPIO_LPC_INT));
+
+	return 0;
+}
+#else
+#define n516_lpc_suspend NULL
+#define n516_lpc_resume NULL
+#endif
+
+
+static struct i2c_driver n516_lpc_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver		= {
+		.name	= "n516-keys",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= n516_lpc_probe,
+	.remove		= __devexit_p(n516_lpc_remove),
+	.detect		= n516_lpc_detect,
+	.id_table	= n516_lpc_i2c_ids,
+	.address_list	= normal_i2c,
+	.suspend	= n516_lpc_suspend,
+	.resume		= n516_lpc_resume,
+};
+
+static int __init n516_lpc_init(void)
+{
+	return i2c_add_driver(&n516_lpc_driver);
+}
+module_init(n516_lpc_init);
+
+static void __exit n516_lpc_exit(void)
+{
+	i2c_del_driver(&n516_lpc_driver);
+}
+module_exit(n516_lpc_exit);
+
+MODULE_AUTHOR("Yauhen Kharuzhy");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Keys and power controller driver for N516");
+MODULE_ALIAS("platform:n516-keys");
