openwrt_archive/target/linux/xburst/files/drivers/i2c/chips/n516-lpc.c
2011-12-03 19:36:48 +00:00

478 lines
11 KiB
C

#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[] = {0x54, I2C_CLIENT_END};
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
/* Insmod parameters */
I2C_CLIENT_INSMOD_1(n516_lpc);
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, int kind, 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_data = &addr_data,
.suspend = n516_lpc_suspend,
.resume = n516_lpc_resume,
};
static int __init n516_lpc_init(void)
{
return i2c_add_driver(&n516_lpc_driver);
}
static void __exit n516_lpc_exit(void)
{
i2c_del_driver(&n516_lpc_driver);
}
module_init(n516_lpc_init);
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");