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511 lines
13 KiB
Diff
511 lines
13 KiB
Diff
From b3c2e7322c09f0ce2f7ba89b7c6fceb6e00c2da0 Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Wed, 12 May 2010 14:22:36 +0200
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Subject: [PATCH] Add n516 lpc driver
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---
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drivers/misc/Kconfig | 8 +
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drivers/misc/Makefile | 1 +
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drivers/misc/n516-lpc.c | 471 +++++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 480 insertions(+), 0 deletions(-)
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create mode 100644 drivers/misc/n516-lpc.c
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--- a/drivers/misc/Kconfig
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+++ b/drivers/misc/Kconfig
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@@ -390,6 +390,14 @@ config BMP085
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To compile this driver as a module, choose M here: the
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module will be called bmp085.
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+config N516_LPC
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+ tristate "N516 keys & power controller"
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+ depends on I2C
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+ depends on INPUT
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+ depends on POWER_SUPPLY
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+ help
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+ N516 keyboard & power controller driver
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+
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source "drivers/misc/c2port/Kconfig"
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source "drivers/misc/eeprom/Kconfig"
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source "drivers/misc/cb710/Kconfig"
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--- a/drivers/misc/Makefile
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+++ b/drivers/misc/Makefile
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@@ -35,3 +35,4 @@ obj-y += eeprom/
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obj-y += cb710/
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obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o
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obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
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+obj-$(CONFIG_N516_LPC) += n516-lpc.o
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--- /dev/null
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+++ b/drivers/misc/n516-lpc.c
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@@ -0,0 +1,471 @@
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+#include <linux/module.h>
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+#include <linux/version.h>
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+#include <linux/init.h>
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+#include <linux/fs.h>
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+#include <linux/interrupt.h>
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+#include <linux/irq.h>
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+#include <linux/sched.h>
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+#include <linux/pm.h>
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+#include <linux/sysctl.h>
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+#include <linux/proc_fs.h>
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+#include <linux/delay.h>
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+#include <linux/platform_device.h>
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+#include <linux/input.h>
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+#include <linux/power_supply.h>
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+#include <linux/suspend.h>
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+
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+#include <linux/i2c.h>
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+
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+#include <asm/mach-jz4740/irq.h>
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+#include <asm/mach-jz4740/gpio.h>
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+#include <asm/mach-jz4740/board-n516.h>
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+
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+static int batt_level=0;
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+module_param(batt_level, int, 0);
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+
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+struct n516_lpc_chip {
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+ struct i2c_client *i2c_client;
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+ struct input_dev *input;
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+ unsigned int battery_level;
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+ unsigned int suspending:1, can_sleep:1;
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+};
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+
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+static struct n516_lpc_chip *the_lpc;
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+
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+struct i2c_device_id n516_lpc_i2c_ids[] = {
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+ {"LPC524", 0},
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+ {},
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+};
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+
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+MODULE_DEVICE_TABLE(i2c, n516_lpc_i2c_ids);
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+
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+static const unsigned short normal_i2c[] = I2C_ADDRS(0x54);
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+
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+static const unsigned int n516_lpc_keymap[] = {
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+ [0x01] = KEY_4,
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+ [0x02] = KEY_3,
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+ [0x03] = KEY_2,
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+ [0x04] = KEY_1,
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+ [0x05] = KEY_0,
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+ [0x07] = KEY_9,
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+ [0x08] = KEY_8,
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+ [0x09] = KEY_7,
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+ [0x0a] = KEY_6,
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+ [0x0b] = KEY_5,
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+ [0x0d] = KEY_PLAYPAUSE,
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+ [0x0e] = KEY_MENU,
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+ [0x0f] = KEY_SEARCH,
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+ [0x10] = KEY_DIRECTION,
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+ [0x11] = KEY_SPACE,
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+ [0x13] = KEY_ENTER,
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+ [0x14] = KEY_UP,
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+ [0x15] = KEY_DOWN,
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+ [0x16] = KEY_RIGHT,
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+ [0x17] = KEY_LEFT,
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+ [0x19] = KEY_PAGEDOWN,
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+ [0x1a] = KEY_PAGEUP,
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+ [0x1c] = KEY_POWER,
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+ [0x1d] = KEY_ESC,
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+ [0x1e] = KEY_SLEEP,
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+ [0x1f] = KEY_WAKEUP,
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+};
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+
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+static const unsigned int batt_charge[] = {0, 7, 20, 45, 65, 80, 100};
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+#define MAX_BAT_LEVEL 6
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+
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+static inline int n516_bat_charging(void)
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+{
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+ return !gpio_get_value(GPIO_CHARG_STAT_N);
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+}
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+
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+static int n516_bat_get_status(struct power_supply *b)
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+{
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+ if (power_supply_am_i_supplied(b)) {
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+ if (n516_bat_charging())
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+ return POWER_SUPPLY_STATUS_CHARGING;
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+ else
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+ return POWER_SUPPLY_STATUS_FULL;
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+ } else {
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+ return POWER_SUPPLY_STATUS_DISCHARGING;
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+ }
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+}
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+
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+static int n516_bat_get_charge(struct power_supply *b)
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+{
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+ return batt_charge[the_lpc->battery_level];
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+}
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+
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+static int n516_bat_get_property(struct power_supply *b,
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+ enum power_supply_property psp,
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+ union power_supply_propval *val)
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+{
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+ switch (psp) {
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+ case POWER_SUPPLY_PROP_STATUS:
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+ val->intval = n516_bat_get_status(b);
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+ break;
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+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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+ val->intval = 100;
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+ break;
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+ case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
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+ val->intval = 0;
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+ break;
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+ case POWER_SUPPLY_PROP_CHARGE_NOW:
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+ val->intval = n516_bat_get_charge(b);
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+ break;
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+ default:
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+ return -EINVAL;
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+ }
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+ return 0;
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+}
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+
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+static void n516_bat_power_changed(struct power_supply *p)
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+{
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+ if (power_supply_am_i_supplied(p) && !n516_bat_charging())
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+ the_lpc->battery_level = MAX_BAT_LEVEL;
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+
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+ power_supply_changed(p);
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+}
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+
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+static enum power_supply_property n516_bat_properties[] = {
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+ POWER_SUPPLY_PROP_STATUS,
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+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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+ POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
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+ POWER_SUPPLY_PROP_CHARGE_NOW,
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+};
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+
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+static struct power_supply n516_battery = {
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+ .name = "n516-battery",
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+ .get_property = n516_bat_get_property,
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+ .properties = n516_bat_properties,
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+ .num_properties = ARRAY_SIZE(n516_bat_properties),
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+ .external_power_changed = n516_bat_power_changed,
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+};
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+
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+static irqreturn_t n516_bat_charge_irq(int irq, void *dev)
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+{
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+ struct power_supply *psy = dev;
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+
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+ dev_dbg(psy->dev, "Battery charging IRQ\n");
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+
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+ if (power_supply_am_i_supplied(psy) && !n516_bat_charging())
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+ the_lpc->battery_level = MAX_BAT_LEVEL;
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+
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+ power_supply_changed(psy);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static int n516_lpc_send_message(struct n516_lpc_chip *chip, unsigned char val)
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+{
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+ struct i2c_client *client = chip->i2c_client;
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+ struct i2c_msg msg = {client->addr, client->flags, 1, &val};
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+ int ret = 0;
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+
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+ ret = i2c_transfer(client->adapter, &msg, 1);
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+ return ret > 0 ? 0 : ret;
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+}
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+
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+static void n516_key_event(struct n516_lpc_chip *chip, unsigned char keycode)
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+{
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+ struct i2c_client *client = chip->i2c_client;
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+ bool long_press = false;
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+
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+ if (keycode & 0x40) {
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+ keycode &= ~0x40;
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+ long_press = true;
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+ }
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+
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+ dev_dbg(&client->dev, "keycode: 0x%02x, long_press: 0x%02x\n", keycode, (unsigned int)long_press);
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+
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+ if (keycode >= ARRAY_SIZE(n516_lpc_keymap) || n516_lpc_keymap[keycode] == 0)
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+ return;
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+
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+ if (long_press)
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+ input_report_key(chip->input, KEY_LEFTALT, 1);
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+
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+ input_report_key(chip->input, n516_lpc_keymap[keycode], 1);
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+ input_sync(chip->input);
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+ input_report_key(chip->input, n516_lpc_keymap[keycode], 0);
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+
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+ if (long_press)
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+ input_report_key(chip->input, KEY_LEFTALT, 0);
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+ input_sync(chip->input);
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+}
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+
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+static void n516_battery_event(struct n516_lpc_chip *chip, unsigned char battery_level)
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+{
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+ if (battery_level != chip->battery_level) {
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+ chip->battery_level = battery_level;
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+ power_supply_changed(&n516_battery);
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+ }
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+}
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+
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+static irqreturn_t n516_lpc_irq_thread(int irq, void *devid)
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+{
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+ struct n516_lpc_chip *chip = (struct n516_lpc_chip*)devid;
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+ int ret;
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+ unsigned char raw_msg;
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+ struct i2c_client *client = chip->i2c_client;
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+ struct i2c_msg msg = {client->addr, client->flags | I2C_M_RD, 1, &raw_msg};
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+
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+ if (client->dev.power.status >= DPM_OFF)
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+ return IRQ_HANDLED;
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+
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+ ret = i2c_transfer(client->adapter, &msg, 1);
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+ if (ret != 1) {
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+ dev_dbg(&client->dev, "I2C error: %d\n", ret);
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+ return IRQ_HANDLED;
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+ }
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+
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+ dev_dbg(&client->dev, "msg: 0x%02x\n", raw_msg);
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+
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+ /* Ack wakeup event */
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+ if ((raw_msg & ~0x40) < ARRAY_SIZE(n516_lpc_keymap))
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+ n516_key_event(chip, raw_msg);
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+ else if ((raw_msg >= 0x81) && (raw_msg <= 0x87))
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+ n516_battery_event(chip, raw_msg - 0x81);
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+ else if (raw_msg == 0x7e)
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+ n516_lpc_send_message(chip, 0x00);
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+ else
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+ dev_warn(&client->dev, "Unknown message: %x\n", raw_msg);
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+
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+ if (chip->suspending)
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+ chip->can_sleep = 0;
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static void n516_lpc_power_off(void)
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+{
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+ struct i2c_client *client = the_lpc->i2c_client;
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+ unsigned char val = 0x01;
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+ struct i2c_msg msg = {client->addr, client->flags, 1, &val};
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+
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+ printk("Issue LPC POWEROFF command...\n");
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+ while (1)
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+ i2c_transfer(client->adapter, &msg, 1);
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+}
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+
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+static int n516_lpc_detect(struct i2c_client *client, struct i2c_board_info *info)
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+{
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+ return 0;
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+}
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+
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+static int n516_lpc_suspend_notifier(struct notifier_block *nb,
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+ unsigned long event,
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+ void *dummy)
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+{
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+ switch(event) {
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+ case PM_SUSPEND_PREPARE:
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+ the_lpc->suspending = 1;
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+ the_lpc->can_sleep = 1;
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+ break;
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+ case PM_POST_SUSPEND:
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+ the_lpc->suspending = 0;
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+ the_lpc->can_sleep = 1;
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+ break;
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+ default:
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+ return NOTIFY_DONE;
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+ }
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+ return NOTIFY_OK;
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+}
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+
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+static struct notifier_block n516_lpc_notif_block = {
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+ .notifier_call = n516_lpc_suspend_notifier,
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+};
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+
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+static int __devinit n516_lpc_probe(struct i2c_client *client, const struct i2c_device_id *id)
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+{
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+ struct n516_lpc_chip *chip;
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+ struct input_dev *input;
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+ int ret = 0;
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+ int i;
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+
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+ chip = kzalloc(sizeof(*chip), GFP_KERNEL);
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+ if (!chip)
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+ return -ENOMEM;
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+
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+ the_lpc = chip;
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+ chip->i2c_client = client;
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+ if ((batt_level > 0) && (batt_level < ARRAY_SIZE(batt_charge)))
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+ chip->battery_level = batt_level;
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+ else
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+ chip->battery_level = 1;
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+
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+ i2c_set_clientdata(client, chip);
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+
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+ ret = gpio_request(GPIO_LPC_INT, "LPC interrupt request");
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+ if (ret) {
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+ dev_err(&client->dev, "Unable to reguest LPC INT GPIO\n");
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+ goto err_gpio_req_lpcint;
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+ }
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+
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+ ret = gpio_request(GPIO_CHARG_STAT_N, "LPC charging status");
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+ if (ret) {
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+ dev_err(&client->dev, "Unable to reguest CHARG STAT GPIO\n");
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+ goto err_gpio_req_chargstat;
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+ }
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+
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+ /* Enter normal mode */
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+ n516_lpc_send_message(chip, 0x2);
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+
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+ input = input_allocate_device();
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+ if (!input) {
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+ dev_err(&client->dev, "Unable to allocate input device\n");
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+ ret = -ENOMEM;
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+ goto err_input_alloc;
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+ }
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+
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+ chip->input = input;
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+
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+ __set_bit(EV_KEY, input->evbit);
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+
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+ for (i = 0; i < ARRAY_SIZE(n516_lpc_keymap); i++)
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+ __set_bit(n516_lpc_keymap[i], input->keybit);
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+
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+ __set_bit(KEY_LEFTALT, input->keybit);
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+
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+ input->name = "n516-keys";
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+ input->phys = "n516-keys/input0";
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+ input->dev.parent = &client->dev;
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+ input->id.bustype = BUS_I2C;
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+ input->id.vendor = 0x0001;
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+ input->id.product = 0x0001;
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+ input->id.version = 0x0100;
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+
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+ ret = input_register_device(input);
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+ if (ret < 0) {
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+ dev_err(&client->dev, "Unable to register input device\n");
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+ goto err_input_register;
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+ }
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+
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+ ret = power_supply_register(NULL, &n516_battery);
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+ if (ret) {
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+ dev_err(&client->dev, "Unable to register N516 battery\n");
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+ goto err_bat_reg;
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+ }
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+
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+ ret = request_threaded_irq(gpio_to_irq(GPIO_LPC_INT), NULL,
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+ n516_lpc_irq_thread,
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+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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+ "lpc", chip);
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+ if (ret) {
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+ dev_err(&client->dev, "request_irq failed: %d\n", ret);
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+ goto err_request_lpc_irq;
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+ }
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+
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+ ret = request_irq(gpio_to_irq(GPIO_CHARG_STAT_N), n516_bat_charge_irq,
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+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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+ "battery charging", &n516_battery);
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+ if (ret) {
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+ dev_err(&client->dev, "Unable to claim battery charging IRQ\n");
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+ goto err_request_chrg_irq;
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+ }
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+
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+ pm_power_off = n516_lpc_power_off;
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+ ret = register_pm_notifier(&n516_lpc_notif_block);
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+ if (ret) {
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+ dev_err(&client->dev, "Unable to register PM notify block\n");
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+ goto err_reg_pm_notifier;
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+ }
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+
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+ device_init_wakeup(&client->dev, 1);
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+
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+ return 0;
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+
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+ unregister_pm_notifier(&n516_lpc_notif_block);
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+err_reg_pm_notifier:
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+ free_irq(gpio_to_irq(GPIO_CHARG_STAT_N), &n516_battery);
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+err_request_chrg_irq:
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+ free_irq(gpio_to_irq(GPIO_LPC_INT), chip);
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+err_request_lpc_irq:
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+ power_supply_unregister(&n516_battery);
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+err_bat_reg:
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+ input_unregister_device(input);
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+err_input_register:
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+ input_free_device(input);
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+err_input_alloc:
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+ gpio_free(GPIO_CHARG_STAT_N);
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+err_gpio_req_chargstat:
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+ gpio_free(GPIO_LPC_INT);
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+err_gpio_req_lpcint:
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+ i2c_set_clientdata(client, NULL);
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+ kfree(chip);
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+
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+ return ret;
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+}
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+
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+static int __devexit n516_lpc_remove(struct i2c_client *client)
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+{
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+ struct n516_lpc_chip *chip = i2c_get_clientdata(client);
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+
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+ unregister_pm_notifier(&n516_lpc_notif_block);
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+ pm_power_off = NULL;
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+ free_irq(gpio_to_irq(GPIO_CHARG_STAT_N), &n516_battery);
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+ free_irq(gpio_to_irq(GPIO_LPC_INT), chip);
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+ power_supply_unregister(&n516_battery);
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+ input_unregister_device(chip->input);
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+ gpio_free(GPIO_CHARG_STAT_N);
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+ 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");
|