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Subject[PATCH v8 8/8] Loongson: YeeLoong: add input/hotkey driver
Date
From: Wu Zhangjin <wuzhangjin@gmail.com>

This patch adds Hotkey Driver, which will do relative actions for The
hotkey event(/sys/class/input) and report the corresponding input keys
to the user-space applications.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
---
arch/mips/include/asm/mach-loongson/loongson.h | 6 +
arch/mips/loongson/common/cmdline.c | 8 +
drivers/platform/mips/Kconfig | 2 +
drivers/platform/mips/yeeloong_laptop.c | 412 ++++++++++++++++++++++++
4 files changed, 428 insertions(+), 0 deletions(-)

diff --git a/arch/mips/include/asm/mach-loongson/loongson.h b/arch/mips/include/asm/mach-loongson/loongson.h
index ee8bc83..13e208e 100644
--- a/arch/mips/include/asm/mach-loongson/loongson.h
+++ b/arch/mips/include/asm/mach-loongson/loongson.h
@@ -43,6 +43,12 @@ static inline void prom_init_uart_base(void)
#endif
}

+/*
+ * Copy kernel command line from arcs_cmdline
+ */
+#include <asm/setup.h>
+extern char loongson_cmdline[COMMAND_LINE_SIZE];
+
/* irq operation functions */
extern void bonito_irqdispatch(void);
extern void __init bonito_irq_init(void);
diff --git a/arch/mips/loongson/common/cmdline.c b/arch/mips/loongson/common/cmdline.c
index 7ad47f2..617faee 100644
--- a/arch/mips/loongson/common/cmdline.c
+++ b/arch/mips/loongson/common/cmdline.c
@@ -17,6 +17,7 @@
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
+#include <linux/module.h>
#include <asm/bootinfo.h>

#include <loongson.h>
@@ -25,6 +26,10 @@ int prom_argc;
/* pmon passes arguments in 32bit pointers */
int *_prom_argv;

+/* the kernel command line copied from arcs_cmdline */
+char loongson_cmdline[COMMAND_LINE_SIZE];
+EXPORT_SYMBOL(loongson_cmdline);
+
void __init prom_init_cmdline(void)
{
int i;
@@ -51,4 +56,7 @@ void __init prom_init_cmdline(void)
strcat(arcs_cmdline, " root=/dev/hda1");

prom_init_machtype();
+
+ /* copy arcs_cmdline into loongson_cmdline */
+ strncpy(loongson_cmdline, arcs_cmdline, COMMAND_LINE_SIZE);
}
diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
index e2dbe28..8262dff 100644
--- a/drivers/platform/mips/Kconfig
+++ b/drivers/platform/mips/Kconfig
@@ -22,6 +22,8 @@ config LEMOTE_YEELOONG2F
select APM_EMULATION
select HWMON
select VIDEO_OUTPUT_CONTROL
+ select INPUT_SPARSEKMAP
+ depends on INPUT
help
YeeLoong netbook is a mini laptop made by Lemote, which is basically
compatible to FuLoong2F mini PC, but it has an extra Embedded
diff --git a/drivers/platform/mips/yeeloong_laptop.c b/drivers/platform/mips/yeeloong_laptop.c
index 5e83788..516312e 100644
--- a/drivers/platform/mips/yeeloong_laptop.c
+++ b/drivers/platform/mips/yeeloong_laptop.c
@@ -17,7 +17,14 @@
#include <linux/hwmon.h> /* for hwmon subdriver */
#include <linux/hwmon-sysfs.h>
#include <linux/video_output.h> /* for video output subdriver */
+#include <linux/input.h> /* for hotkey subdriver */
+#include <linux/input/sparse-keymap.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>

+#include <cs5536/cs5536.h>
+
+#include <loongson.h> /* for loongson_cmdline */
#include <ec_kb3310b.h>

/* backlight subdriver */
@@ -515,6 +522,403 @@ static void yeeloong_vo_exit(void)
}
}

+/* hotkey subdriver */
+
+static struct input_dev *yeeloong_hotkey_dev;
+
+static const struct key_entry yeeloong_keymap[] = {
+ {KE_SW, EVENT_LID, { SW_LID } },
+ {KE_KEY, EVENT_CAMERA, { KEY_CAMERA } }, /* Fn + ESC */
+ {KE_KEY, EVENT_SLEEP, { KEY_SLEEP } }, /* Fn + F1 */
+ {KE_KEY, EVENT_DISPLAY_TOGGLE, { KEY_SWITCHVIDEOMODE } }, /* Fn + F3 */
+ {KE_KEY, EVENT_AUDIO_MUTE, { KEY_MUTE } }, /* Fn + F4 */
+ {KE_KEY, EVENT_WLAN, { KEY_WLAN } }, /* Fn + F5 */
+ {KE_KEY, EVENT_DISPLAY_BRIGHTNESS, { KEY_BRIGHTNESSUP } }, /* Fn + up */
+ {KE_KEY, EVENT_DISPLAY_BRIGHTNESS, { KEY_BRIGHTNESSDOWN } }, /* Fn + down */
+ {KE_KEY, EVENT_AUDIO_VOLUME, { KEY_VOLUMEUP } }, /* Fn + right */
+ {KE_KEY, EVENT_AUDIO_VOLUME, { KEY_VOLUMEDOWN } }, /* Fn + left */
+ {KE_END, 0}
+};
+
+static struct key_entry *get_event_key_entry(int event, int status)
+{
+ struct key_entry *ke;
+ static int old_brightness_status = -1;
+ static int old_volume_status = -1;
+
+ ke = sparse_keymap_entry_from_scancode(yeeloong_hotkey_dev, event);
+ if (!ke)
+ return NULL;
+
+ switch (event) {
+ case EVENT_DISPLAY_BRIGHTNESS:
+ /* current status > old one, means up */
+ if ((status < old_brightness_status) || (0 == status))
+ ke++;
+ old_brightness_status = status;
+ break;
+ case EVENT_AUDIO_VOLUME:
+ if ((status < old_volume_status) || (0 == status))
+ ke++;
+ old_volume_status = status;
+ break;
+ default:
+ break;
+ }
+
+ return ke;
+}
+
+static int report_lid_switch(int status)
+{
+ input_report_switch(yeeloong_hotkey_dev, SW_LID, !status);
+ input_sync(yeeloong_hotkey_dev);
+
+ return status;
+}
+
+static int crt_detect_handler(int status)
+{
+ if (status) {
+ yeeloong_crt_vo_set(BIT_CRT_DETECT_PLUG);
+ yeeloong_lcd_vo_set(BIT_DISPLAY_LCD_OFF);
+ } else {
+ yeeloong_lcd_vo_set(BIT_DISPLAY_LCD_ON);
+ yeeloong_crt_vo_set(BIT_CRT_DETECT_UNPLUG);
+ }
+ return status;
+}
+
+#define EC_VER_LEN 64
+
+static int black_screen_handler(int status)
+{
+ char *p, ec_ver[EC_VER_LEN];
+
+ p = strstr(loongson_cmdline, "EC_VER=");
+ if (!p)
+ memset(ec_ver, 0, EC_VER_LEN);
+ else {
+ strncpy(ec_ver, p, EC_VER_LEN);
+ p = strstr(ec_ver, " ");
+ if (p)
+ *p = '\0';
+ }
+
+ /* Seems EC(>=PQ1D26) does this job for us, we can not do it again,
+ * otherwise, the brightness will not resume to the normal level! */
+ if (strncasecmp(ec_ver, "EC_VER=PQ1D26", 64) < 0)
+ yeeloong_lcd_vo_set(status);
+
+ return status;
+}
+
+static int display_toggle_handler(int status)
+{
+ static int video_output_status;
+
+ /* Only enable switch video output button
+ * when CRT is connected */
+ if (ec_read(REG_CRT_DETECT) == BIT_CRT_DETECT_UNPLUG)
+ return 0;
+ /* 0. no CRT connected: LCD on, CRT off
+ * 1. BOTH on
+ * 2. LCD off, CRT on
+ * 3. BOTH off
+ * 4. LCD on, CRT off
+ */
+ video_output_status++;
+ if (video_output_status > 4)
+ video_output_status = 1;
+
+ switch (video_output_status) {
+ case 1:
+ yeeloong_lcd_vo_set(BIT_DISPLAY_LCD_ON);
+ yeeloong_crt_vo_set(BIT_CRT_DETECT_PLUG);
+ break;
+ case 2:
+ yeeloong_lcd_vo_set(BIT_DISPLAY_LCD_OFF);
+ yeeloong_crt_vo_set(BIT_CRT_DETECT_PLUG);
+ break;
+ case 3:
+ yeeloong_lcd_vo_set(BIT_DISPLAY_LCD_OFF);
+ yeeloong_crt_vo_set(BIT_CRT_DETECT_UNPLUG);
+ break;
+ case 4:
+ yeeloong_lcd_vo_set(BIT_DISPLAY_LCD_ON);
+ yeeloong_crt_vo_set(BIT_CRT_DETECT_UNPLUG);
+ break;
+ default:
+ /* Ensure LCD is on */
+ yeeloong_lcd_vo_set(BIT_DISPLAY_LCD_ON);
+ break;
+ }
+ return video_output_status;
+}
+
+static int camera_handler(int status)
+{
+ int value;
+
+ value = ec_read(REG_CAMERA_CONTROL);
+ ec_write(REG_CAMERA_CONTROL, value | (1 << 1));
+
+ return status;
+}
+
+static int usb2_handler(int status)
+{
+ pr_emerg("USB2 Over Current occurred\n");
+
+ return status;
+}
+
+static int usb0_handler(int status)
+{
+ pr_emerg("USB0 Over Current occurred\n");
+
+ return status;
+}
+
+/* yeeloong_wifi_handler may be implemented in the wifi driver */
+sci_handler yeeloong_wifi_handler;
+EXPORT_SYMBOL(yeeloong_wifi_handler);
+
+
+static void do_event_action(int event)
+{
+ sci_handler handler;
+ int reg, status;
+ struct key_entry *ke;
+
+ reg = 0;
+ handler = NULL;
+
+ switch (event) {
+ case EVENT_LID:
+ reg = REG_LID_DETECT;
+ break;
+ case EVENT_DISPLAY_TOGGLE:
+ handler = display_toggle_handler;
+ break;
+ case EVENT_CRT_DETECT:
+ reg = REG_CRT_DETECT;
+ handler = crt_detect_handler;
+ break;
+ case EVENT_CAMERA:
+ reg = REG_CAMERA_STATUS;
+ handler = camera_handler;
+ break;
+ case EVENT_USB_OC2:
+ reg = REG_USB2_FLAG;
+ handler = usb2_handler;
+ break;
+ case EVENT_USB_OC0:
+ reg = REG_USB0_FLAG;
+ handler = usb0_handler;
+ break;
+ case EVENT_BLACK_SCREEN:
+ reg = REG_DISPLAY_LCD;
+ handler = black_screen_handler;
+ break;
+ case EVENT_AUDIO_MUTE:
+ reg = REG_AUDIO_MUTE;
+ break;
+ case EVENT_DISPLAY_BRIGHTNESS:
+ reg = REG_DISPLAY_BRIGHTNESS;
+ break;
+ case EVENT_AUDIO_VOLUME:
+ reg = REG_AUDIO_VOLUME;
+ break;
+ case EVENT_WLAN:
+ /* We use 2 to indicate it as a switch */
+ status = 2;
+ handler = yeeloong_wifi_handler;
+ break;
+ default:
+ break;
+ }
+
+ if (reg != 0)
+ status = ec_read(reg);
+
+ if (handler != NULL)
+ status = handler(status);
+
+ pr_info("%s: event: %d status: %d\n", __func__, event, status);
+
+ /* Report current key to user-space */
+ ke = get_event_key_entry(event, status);
+ if (ke) {
+ if (ke->keycode == SW_LID)
+ report_lid_switch(status);
+ else
+ sparse_keymap_report_entry(yeeloong_hotkey_dev, ke, 1,
+ true);
+ }
+}
+
+/*
+ * SCI(system control interrupt) main interrupt routine
+ *
+ * We will do the query and get event number together so the interrupt routine
+ * should be longer than 120us now at least 3ms elpase for it.
+ */
+static irqreturn_t sci_irq_handler(int irq, void *dev_id)
+{
+ int ret, event;
+
+ if (SCI_IRQ_NUM != irq)
+ return IRQ_NONE;
+
+ /* Query the event number */
+ ret = ec_query_event_num();
+ if (ret < 0)
+ return IRQ_NONE;
+
+ event = ec_get_event_num();
+ if (event < EVENT_START || event > EVENT_END)
+ return IRQ_NONE;
+
+ /* Execute corresponding actions */
+ do_event_action(event);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Config and init some msr and gpio register properly.
+ */
+static int sci_irq_init(void)
+{
+ u32 hi, lo;
+ u32 gpio_base;
+ unsigned long flags;
+ int ret;
+
+ /* Get gpio base */
+ _rdmsr(DIVIL_MSR_REG(DIVIL_LBAR_GPIO), &hi, &lo);
+ gpio_base = lo & 0xff00;
+
+ /* Filter the former kb3310 interrupt for security */
+ ret = ec_query_event_num();
+ if (ret)
+ return ret;
+
+ /* For filtering next number interrupt */
+ udelay(10000);
+
+ /* Set gpio native registers and msrs for GPIO27 SCI EVENT PIN
+ * gpio :
+ * input, pull-up, no-invert, event-count and value 0,
+ * no-filter, no edge mode
+ * gpio27 map to Virtual gpio0
+ * msr :
+ * no primary and lpc
+ * Unrestricted Z input to IG10 from Virtual gpio 0.
+ */
+ local_irq_save(flags);
+ _rdmsr(0x80000024, &hi, &lo);
+ lo &= ~(1 << 10);
+ _wrmsr(0x80000024, hi, lo);
+ _rdmsr(0x80000025, &hi, &lo);
+ lo &= ~(1 << 10);
+ _wrmsr(0x80000025, hi, lo);
+ _rdmsr(0x80000023, &hi, &lo);
+ lo |= (0x0a << 0);
+ _wrmsr(0x80000023, hi, lo);
+ local_irq_restore(flags);
+
+ /* Set gpio27 as sci interrupt
+ *
+ * input, pull-up, no-fliter, no-negedge, invert
+ * the sci event is just about 120us
+ */
+ asm(".set noreorder\n");
+ /* input enable */
+ outl(0x00000800, (gpio_base | 0xA0));
+ /* revert the input */
+ outl(0x00000800, (gpio_base | 0xA4));
+ /* event-int enable */
+ outl(0x00000800, (gpio_base | 0xB8));
+ asm(".set reorder\n");
+
+ return 0;
+}
+
+static struct irqaction sci_irqaction = {
+ .handler = sci_irq_handler,
+ .name = "sci",
+ .flags = IRQF_SHARED,
+};
+
+static int yeeloong_hotkey_init(void)
+{
+ int ret;
+
+ ret = sci_irq_init();
+ if (ret)
+ return -EFAULT;
+
+ ret = setup_irq(SCI_IRQ_NUM, &sci_irqaction);
+ if (ret)
+ return -EFAULT;
+
+ yeeloong_hotkey_dev = input_allocate_device();
+
+ if (!yeeloong_hotkey_dev) {
+ remove_irq(SCI_IRQ_NUM, &sci_irqaction);
+ return -ENOMEM;
+ }
+
+ yeeloong_hotkey_dev->name = "HotKeys";
+ yeeloong_hotkey_dev->phys = "button/input0";
+ yeeloong_hotkey_dev->id.bustype = BUS_HOST;
+ yeeloong_hotkey_dev->dev.parent = NULL;
+
+ ret = sparse_keymap_setup(yeeloong_hotkey_dev, yeeloong_keymap, NULL);
+ if (ret) {
+ pr_err("Fail to setup input device keymap\n");
+ input_free_device(yeeloong_hotkey_dev);
+ return ret;
+ }
+
+ ret = input_register_device(yeeloong_hotkey_dev);
+ if (ret) {
+ sparse_keymap_free(yeeloong_hotkey_dev);
+ input_free_device(yeeloong_hotkey_dev);
+ return ret;
+ }
+
+ /* Update the current status of LID */
+ report_lid_switch(BIT_LID_DETECT_ON);
+
+#ifdef CONFIG_LOONGSON_SUSPEND
+ /* Install the real yeeloong_report_lid_status for pm.c */
+ yeeloong_report_lid_status = report_lid_switch;
+#endif
+
+ return 0;
+}
+
+static void yeeloong_hotkey_exit(void)
+{
+ /* Free irq */
+ remove_irq(SCI_IRQ_NUM, &sci_irqaction);
+
+#ifdef CONFIG_LOONGSON_SUSPEND
+ /* Uninstall yeeloong_report_lid_status for pm.c */
+ if (yeeloong_report_lid_status == report_lid_switch)
+ yeeloong_report_lid_status = NULL;
+#endif
+
+ if (yeeloong_hotkey_dev) {
+ sparse_keymap_free(yeeloong_hotkey_dev);
+ input_unregister_device(yeeloong_hotkey_dev);
+ yeeloong_hotkey_dev = NULL;
+ }
+}
+
#ifdef CONFIG_PM
static void usb_ports_set(int status)
{
@@ -604,11 +1008,19 @@ static int __init yeeloong_init(void)
return ret;
}

+ ret = yeeloong_hotkey_init();
+ if (ret) {
+ pr_err("Fail to register yeeloong hotkey driver.\n");
+ yeeloong_hotkey_exit();
+ return ret;
+ }
+
return 0;
}

static void __exit yeeloong_exit(void)
{
+ yeeloong_hotkey_exit();
yeeloong_vo_exit();
yeeloong_hwmon_exit();
yeeloong_battery_exit();
--
1.6.2.1


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