panasonic-laptop - switch to using sparse keymap library

nstead of implementing its own version of keymap hanlding switch over to
using sparse keymap library.

Cc: Harald Welte <laforge@gnumonks.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

2 files changed, 62 insertions, 111 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 0b11b41a85f9..c0446d67cf7a 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -171,6 +171,7 @@ config PANASONIC_LAPTOP
         tristate "Panasonic Laptop Extras"
         depends on INPUT && ACPI
         depends on BACKLIGHT_CLASS_DEVICE
+        select INPUT_SPARSEKMAP
         ---help---
           This driver adds support for access to backlight control and hotkeys
           on Panasonic Let's Note laptops.
diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
index ec01c3d8fc5a..b3b9e0458ae1 100644
--- a/drivers/platform/x86/panasonic-laptop.c
+++ b/drivers/platform/x86/panasonic-laptop.c
@@ -128,6 +128,7 @@
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
 
 
 #ifndef ACPI_HOTKEY_COMPONENT
@@ -200,30 +201,29 @@ static struct acpi_driver acpi_pcc_driver = {
                         },
 };
 
-#define KEYMAP_SIZE             11
-static const unsigned int initial_keymap[KEYMAP_SIZE] = {
-        /*  0 */ KEY_RESERVED,
-        /*  1 */ KEY_BRIGHTNESSDOWN,
-        /*  2 */ KEY_BRIGHTNESSUP,
-        /*  3 */ KEY_DISPLAYTOGGLE,
-        /*  4 */ KEY_MUTE,
-        /*  5 */ KEY_VOLUMEDOWN,
-        /*  6 */ KEY_VOLUMEUP,
-        /*  7 */ KEY_SLEEP,
-        /*  8 */ KEY_PROG1, /* Change CPU boost */
-        /*  9 */ KEY_BATTERY,
-        /* 10 */ KEY_SUSPEND,
+static const struct key_entry panasonic_keymap[] = {
+        { KE_KEY, 0, { KEY_RESERVED } },
+        { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
+        { KE_KEY, 2, { KEY_BRIGHTNESSUP } },
+        { KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
+        { KE_KEY, 4, { KEY_MUTE } },
+        { KE_KEY, 5, { KEY_VOLUMEDOWN } },
+        { KE_KEY, 6, { KEY_VOLUMEUP } },
+        { KE_KEY, 7, { KEY_SLEEP } },
+        { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
+        { KE_KEY, 9, { KEY_BATTERY } },
+        { KE_KEY, 10, { KEY_SUSPEND } },
+        { KE_END, 0 }
 };
 
 struct pcc_acpi {
         acpi_handle             handle;
         unsigned long           num_sifr;
         int                     sticky_mode;
-        u32                     *sinf;
+        u32                     *sinf;
         struct acpi_device      *device;
         struct input_dev        *input_dev;
         struct backlight_device *backlight;
-        unsigned int            keymap[KEYMAP_SIZE];
 };
 
 struct pcc_keyinput {
@@ -446,56 +446,10 @@ static struct attribute_group pcc_attr_group = {
 
 /* hotkey input device driver */
 
-static int pcc_getkeycode(struct input_dev *dev,
-                          unsigned int scancode, unsigned int *keycode)
-{
-        struct pcc_acpi *pcc = input_get_drvdata(dev);
-
-        if (scancode >= ARRAY_SIZE(pcc->keymap))
-                return -EINVAL;
-
-        *keycode = pcc->keymap[scancode];
-
-        return 0;
-}
-
-static int keymap_get_by_keycode(struct pcc_acpi *pcc, unsigned int keycode)
-{
-        int i;
-
-        for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
-                if (pcc->keymap[i] == keycode)
-                        return i+1;
-        }
-
-        return 0;
-}
-
-static int pcc_setkeycode(struct input_dev *dev,
-                          unsigned int scancode, unsigned int keycode)
-{
-        struct pcc_acpi *pcc = input_get_drvdata(dev);
-        int oldkeycode;
-
-        if (scancode >= ARRAY_SIZE(pcc->keymap))
-                return -EINVAL;
-
-        oldkeycode = pcc->keymap[scancode];
-        pcc->keymap[scancode] = keycode;
-
-        set_bit(keycode, dev->keybit);
-
-        if (!keymap_get_by_keycode(pcc, oldkeycode))
-                clear_bit(oldkeycode, dev->keybit);
-
-        return 0;
-}
-
 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 {
         struct input_dev *hotk_input_dev = pcc->input_dev;
         int rc;
-        int key_code, hkey_num;
         unsigned long long result;
 
         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
@@ -508,25 +462,10 @@ static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 
         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
 
-        hkey_num = result & 0xf;
-
-        if (hkey_num < 0 || hkey_num >= ARRAY_SIZE(pcc->keymap)) {
+        if (!sparse_keymap_report_event(hotk_input_dev,
+                                        result & 0xf, result & 0x80, false))
                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
-                                  "hotkey number out of range: %d\n",
-                                  hkey_num));
-                return;
-        }
-
-        key_code = pcc->keymap[hkey_num];
-
-        if (key_code != KEY_RESERVED) {
-                int pushed = (result & 0x80) ? TRUE : FALSE;
-
-                input_report_key(hotk_input_dev, key_code, pushed);
-                input_sync(hotk_input_dev);
-        }
-
-        return;
+                                  "Unknown hotkey event: %d\n", result));
 }
 
 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
@@ -545,40 +484,55 @@ static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
 
 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
 {
-        int i, rc;
+        struct input_dev *input_dev;
+        int error;
 
-        pcc->input_dev = input_allocate_device();
-        if (!pcc->input_dev) {
+        input_dev = input_allocate_device();
+        if (!input_dev) {
                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                                   "Couldn't allocate input device for hotkey"));
                 return -ENOMEM;
         }
 
-        pcc->input_dev->evbit[0] = BIT(EV_KEY);
-
-        pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
-        pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
-        pcc->input_dev->id.bustype = BUS_HOST;
-        pcc->input_dev->id.vendor = 0x0001;
-        pcc->input_dev->id.product = 0x0001;
-        pcc->input_dev->id.version = 0x0100;
-        pcc->input_dev->getkeycode = pcc_getkeycode;
-        pcc->input_dev->setkeycode = pcc_setkeycode;
+        input_dev->name = ACPI_PCC_DRIVER_NAME;
+        input_dev->phys = ACPI_PCC_INPUT_PHYS;
+        input_dev->id.bustype = BUS_HOST;
+        input_dev->id.vendor = 0x0001;
+        input_dev->id.product = 0x0001;
+        input_dev->id.version = 0x0100;
 
-        /* load initial keymap */
-        memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
+        error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
+        if (error) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Unable to setup input device keymap\n"));
+                goto err_free_dev;
+        }
 
-        for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
-                __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
-        __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
+        error = input_register_device(input_dev);
+        if (error) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                  "Unable to register input device\n"));
+                goto err_free_keymap;
+        }
 
-        input_set_drvdata(pcc->input_dev, pcc);
+        pcc->input_dev = input_dev;
+        return 0;
 
-        rc = input_register_device(pcc->input_dev);
-        if (rc < 0)
-                input_free_device(pcc->input_dev);
+ err_free_keymap:
+        sparse_keymap_free(input_dev);
+ err_free_dev:
+        input_free_device(input_dev);
+        return error;
+}
 
-        return rc;
+static void acpi_pcc_destroy_input(struct pcc_acpi *pcc)
+{
+        sparse_keymap_free(pcc->input_dev);
+        input_unregister_device(pcc->input_dev);
+        /*
+         * No need to input_free_device() since core input API refcounts
+         * and free()s the device.
+         */
 }
 
 /* kernel module interface */
@@ -636,7 +590,7 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
         if (result) {
                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                                   "Error installing keyinput handler\n"));
-                goto out_hotkey;
+                goto out_sinf;
         }
 
         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
@@ -651,7 +605,7 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
                                                    &pcc_backlight_ops, &props);
         if (IS_ERR(pcc->backlight)) {
                 result = PTR_ERR(pcc->backlight);
-                goto out_sinf;
+                goto out_input;
         }
 
         /* read the initial brightness setting from the hardware */
@@ -669,12 +623,10 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
 
 out_backlight:
         backlight_device_unregister(pcc->backlight);
+out_input:
+        acpi_pcc_destroy_input(pcc);
 out_sinf:
         kfree(pcc->sinf);
-out_input:
-        input_unregister_device(pcc->input_dev);
-        /* no need to input_free_device() since core input API refcount and
-         * free()s the device */
 out_hotkey:
         kfree(pcc);
 
@@ -709,9 +661,7 @@ static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
 
         backlight_device_unregister(pcc->backlight);
 
-        input_unregister_device(pcc->input_dev);
-        /* no need to input_free_device() since core input API refcount and
-         * free()s the device */
+        acpi_pcc_destroy_input(pcc);
 
         kfree(pcc->sinf);
         kfree(pcc);