Add Lenovo ideapad driver

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

3 files changed, 290 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 79baa6368f79..044f430f3b43 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -219,6 +219,13 @@ config SONYPI_COMPAT
           ---help---
           Build the sonypi driver compatibility code into the sony-laptop driver.
 
+config IDEAPAD_ACPI
+        tristate "Lenovo IdeaPad ACPI Laptop Extras"
+        depends on ACPI
+        depends on RFKILL
+        help
+          This is a driver for the rfkill switches on Lenovo IdeaPad netbooks.
+
 config THINKPAD_ACPI
         tristate "ThinkPad ACPI Laptop Extras"
         depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 4744c7744ffa..85fb2b84f57e 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_ACERHDF)		+= acerhdf.o
 obj-$(CONFIG_HP_WMI)            += hp-wmi.o
 obj-$(CONFIG_TC1100_WMI)        += tc1100-wmi.o
 obj-$(CONFIG_SONY_LAPTOP)       += sony-laptop.o
+obj-$(CONFIG_IDEAPAD_ACPI)      += ideapad_acpi.o
 obj-$(CONFIG_THINKPAD_ACPI)     += thinkpad_acpi.o
 obj-$(CONFIG_FUJITSU_LAPTOP)    += fujitsu-laptop.o
 obj-$(CONFIG_PANASONIC_LAPTOP)  += panasonic-laptop.o
diff --git a/drivers/platform/x86/ideapad_acpi.c b/drivers/platform/x86/ideapad_acpi.c
new file mode 100644
index 000000000000..ae744caf4726
--- /dev/null
+++ b/drivers/platform/x86/ideapad_acpi.c
@@ -0,0 +1,282 @@
+/*
+ *  ideapad_acpi.c - Lenovo IdeaPad ACPI Extras
+ *
+ *  Copyright © 2010 Intel Corporation
+ *  Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ *  02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <linux/rfkill.h>
+
+#define IDEAPAD_DEV_CAMERA      0
+#define IDEAPAD_DEV_WLAN        1
+#define IDEAPAD_DEV_BLUETOOTH   2
+#define IDEAPAD_DEV_3G          3
+#define IDEAPAD_DEV_KILLSW      4
+
+static struct rfkill *ideapad_rfkill[5];
+
+static const char *ideapad_rfk_names[] = {
+        "ideapad_camera", "ideapad_wlan", "ideapad_bluetooth", "ideapad_3g", "ideapad_rfkill"
+};
+static const int ideapad_rfk_types[] = {
+        0, RFKILL_TYPE_WLAN, RFKILL_TYPE_BLUETOOTH, RFKILL_TYPE_WWAN, RFKILL_TYPE_WLAN
+};
+
+static int ideapad_dev_exists(int device)
+{
+        acpi_status status;
+        union acpi_object in_param;
+        struct acpi_object_list input = { 1, &in_param };
+        struct acpi_buffer output;
+        union acpi_object out_obj;
+
+        output.length = sizeof(out_obj);
+        output.pointer = &out_obj;
+
+        in_param.type = ACPI_TYPE_INTEGER;
+        in_param.integer.value = device + 1;
+
+        status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output);
+        if (ACPI_FAILURE(status)) {
+                printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status);
+                return -ENODEV;
+        }
+        if (out_obj.type != ACPI_TYPE_INTEGER) {
+                printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n");
+                return -ENODEV;
+        }
+        return out_obj.integer.value;
+}
+
+static int ideapad_dev_get_state(int device)
+{
+        acpi_status status;
+        union acpi_object in_param;
+        struct acpi_object_list input = { 1, &in_param };
+        struct acpi_buffer output;
+        union acpi_object out_obj;
+
+        output.length = sizeof(out_obj);
+        output.pointer = &out_obj;
+
+        in_param.type = ACPI_TYPE_INTEGER;
+        in_param.integer.value = device + 1;
+
+        status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output);
+        if (ACPI_FAILURE(status)) {
+                printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status);
+                return -ENODEV;
+        }
+        if (out_obj.type != ACPI_TYPE_INTEGER) {
+                printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n");
+                return -ENODEV;
+        }
+        return out_obj.integer.value;
+}
+
+static int ideapad_dev_set_state(int device, int state)
+{
+        acpi_status status;
+        union acpi_object in_params[2];
+        struct acpi_object_list input = { 2, in_params };
+
+        in_params[0].type = ACPI_TYPE_INTEGER;
+        in_params[0].integer.value = device + 1;
+        in_params[1].type = ACPI_TYPE_INTEGER;
+        in_params[1].integer.value = state;
+
+        status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL);
+        if (ACPI_FAILURE(status)) {
+                printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status);
+                return -ENODEV;
+        }
+        return 0;
+}
+static ssize_t show_ideapad_cam(struct device *dev,
+                                struct device_attribute *attr,
+                                char *buf)
+{
+        int state = ideapad_dev_get_state(IDEAPAD_DEV_CAMERA);
+        if (state < 0)
+                return state;
+
+        return sprintf(buf, "%d\n", state);
+}
+
+static ssize_t store_ideapad_cam(struct device *dev,
+                                 struct device_attribute *attr,
+                                 const char *buf, size_t count)
+{
+        int ret, state;
+
+        if (!count)
+                return 0;
+        if (sscanf(buf, "%i", &state) != 1)
+                return -EINVAL;
+        ret = ideapad_dev_set_state(IDEAPAD_DEV_CAMERA, state);
+        if (ret < 0)
+                return ret;
+        return count;
+}
+
+static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
+
+static int ideapad_rfk_set(void *data, bool blocked)
+{
+        int device = (unsigned long)data;
+
+        if (device == IDEAPAD_DEV_KILLSW)
+                return -EINVAL;
+        return ideapad_dev_set_state(device, !blocked);
+}
+
+static struct rfkill_ops ideapad_rfk_ops = {
+        .set_block = ideapad_rfk_set,
+};
+
+static void ideapad_sync_rfk_state(void)
+{
+        int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW);
+        int i;
+
+        rfkill_set_hw_state(ideapad_rfkill[IDEAPAD_DEV_KILLSW], hw_blocked);
+        for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
+                if (ideapad_rfkill[i])
+                        rfkill_set_hw_state(ideapad_rfkill[i], hw_blocked);
+        if (hw_blocked)
+                return;
+
+        for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
+                if (ideapad_rfkill[i])
+                        rfkill_set_sw_state(ideapad_rfkill[i], !ideapad_dev_get_state(i));
+}
+
+static int ideapad_register_rfkill(struct acpi_device *device, int dev)
+{
+        int ret;
+
+        ideapad_rfkill[dev] = rfkill_alloc(ideapad_rfk_names[dev], &device->dev,
+                                           ideapad_rfk_types[dev], &ideapad_rfk_ops,
+                                           (void *)(long)dev);
+        if (!ideapad_rfkill[dev])
+                return -ENOMEM;
+
+        ret = rfkill_register(ideapad_rfkill[dev]);
+        if (ret) {
+                rfkill_destroy(ideapad_rfkill[dev]);
+                return ret;
+        }
+        return 0;
+}
+
+static void ideapad_unregister_rfkill(int dev)
+{
+        if (!ideapad_rfkill[dev])
+                return;
+
+        rfkill_unregister(ideapad_rfkill[dev]);
+        rfkill_destroy(ideapad_rfkill[dev]);
+}
+
+static const struct acpi_device_id ideapad_device_ids[] = {
+        { "VPC2004", 0},
+        { "", 0},
+};
+MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
+
+static int ideapad_acpi_add(struct acpi_device *device)
+{
+        int i;
+        int devs_present[5];
+
+        for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
+                devs_present[i] = ideapad_dev_exists(i);
+                if (devs_present[i] < 0)
+                        return devs_present[i];
+        }
+
+        /* The hardware switch is always present */
+        devs_present[IDEAPAD_DEV_KILLSW] = 1;
+
+        if (devs_present[IDEAPAD_DEV_CAMERA]) {
+                int ret = device_create_file(&device->dev, &dev_attr_camera_power);
+                if (ret)
+                        return ret;
+        }
+
+        for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
+                if (!devs_present[i])
+                        continue;
+
+                ideapad_register_rfkill(device, i);
+        }
+        ideapad_sync_rfk_state();
+        return 0;
+}
+
+static int ideapad_acpi_remove(struct acpi_device *device, int type)
+{
+        int i;
+        device_remove_file(&device->dev, &dev_attr_camera_power);
+        for (i = 0; i < 5; i++)
+                ideapad_unregister_rfkill(i);
+        return 0;
+}
+
+static void ideapad_acpi_notify(struct acpi_device *device, u32 event)
+{
+        ideapad_sync_rfk_state();
+}
+
+static struct acpi_driver ideapad_acpi_driver = {
+        .name = "ideapad_acpi",
+        .class = "IdeaPad",
+        .ids = ideapad_device_ids,
+        .ops.add = ideapad_acpi_add,
+        .ops.remove = ideapad_acpi_remove,
+        .ops.notify = ideapad_acpi_notify,
+        .owner = THIS_MODULE,
+};
+
+
+static int __init ideapad_acpi_module_init(void)
+{
+        acpi_bus_register_driver(&ideapad_acpi_driver);
+
+        return 0;
+}
+
+
+static void __exit ideapad_acpi_module_exit(void)
+{
+        acpi_bus_unregister_driver(&ideapad_acpi_driver);
+
+}
+
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("IdeaPad ACPI Extras");
+MODULE_LICENSE("GPL");
+
+module_init(ideapad_acpi_module_init);
+module_exit(ideapad_acpi_module_exit);