David Woodhouse | 58ac7aa | 2010-08-10 23:44:05 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * ideapad_acpi.c - Lenovo IdeaPad ACPI Extras |
| 3 | * |
| 4 | * Copyright © 2010 Intel Corporation |
| 5 | * Copyright © 2010 David Woodhouse <dwmw2@infradead.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 20 | * 02110-1301, USA. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/types.h> |
| 27 | #include <acpi/acpi_bus.h> |
| 28 | #include <acpi/acpi_drivers.h> |
| 29 | #include <linux/rfkill.h> |
| 30 | |
| 31 | #define IDEAPAD_DEV_CAMERA 0 |
| 32 | #define IDEAPAD_DEV_WLAN 1 |
| 33 | #define IDEAPAD_DEV_BLUETOOTH 2 |
| 34 | #define IDEAPAD_DEV_3G 3 |
| 35 | #define IDEAPAD_DEV_KILLSW 4 |
| 36 | |
| 37 | static struct rfkill *ideapad_rfkill[5]; |
| 38 | |
| 39 | static const char *ideapad_rfk_names[] = { |
| 40 | "ideapad_camera", "ideapad_wlan", "ideapad_bluetooth", "ideapad_3g", "ideapad_rfkill" |
| 41 | }; |
| 42 | static const int ideapad_rfk_types[] = { |
| 43 | 0, RFKILL_TYPE_WLAN, RFKILL_TYPE_BLUETOOTH, RFKILL_TYPE_WWAN, RFKILL_TYPE_WLAN |
| 44 | }; |
| 45 | |
| 46 | static int ideapad_dev_exists(int device) |
| 47 | { |
| 48 | acpi_status status; |
| 49 | union acpi_object in_param; |
| 50 | struct acpi_object_list input = { 1, &in_param }; |
| 51 | struct acpi_buffer output; |
| 52 | union acpi_object out_obj; |
| 53 | |
| 54 | output.length = sizeof(out_obj); |
| 55 | output.pointer = &out_obj; |
| 56 | |
| 57 | in_param.type = ACPI_TYPE_INTEGER; |
| 58 | in_param.integer.value = device + 1; |
| 59 | |
| 60 | status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output); |
| 61 | if (ACPI_FAILURE(status)) { |
| 62 | printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status); |
| 63 | return -ENODEV; |
| 64 | } |
| 65 | if (out_obj.type != ACPI_TYPE_INTEGER) { |
| 66 | printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n"); |
| 67 | return -ENODEV; |
| 68 | } |
| 69 | return out_obj.integer.value; |
| 70 | } |
| 71 | |
| 72 | static int ideapad_dev_get_state(int device) |
| 73 | { |
| 74 | acpi_status status; |
| 75 | union acpi_object in_param; |
| 76 | struct acpi_object_list input = { 1, &in_param }; |
| 77 | struct acpi_buffer output; |
| 78 | union acpi_object out_obj; |
| 79 | |
| 80 | output.length = sizeof(out_obj); |
| 81 | output.pointer = &out_obj; |
| 82 | |
| 83 | in_param.type = ACPI_TYPE_INTEGER; |
| 84 | in_param.integer.value = device + 1; |
| 85 | |
| 86 | status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output); |
| 87 | if (ACPI_FAILURE(status)) { |
| 88 | printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status); |
| 89 | return -ENODEV; |
| 90 | } |
| 91 | if (out_obj.type != ACPI_TYPE_INTEGER) { |
| 92 | printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n"); |
| 93 | return -ENODEV; |
| 94 | } |
| 95 | return out_obj.integer.value; |
| 96 | } |
| 97 | |
| 98 | static int ideapad_dev_set_state(int device, int state) |
| 99 | { |
| 100 | acpi_status status; |
| 101 | union acpi_object in_params[2]; |
| 102 | struct acpi_object_list input = { 2, in_params }; |
| 103 | |
| 104 | in_params[0].type = ACPI_TYPE_INTEGER; |
| 105 | in_params[0].integer.value = device + 1; |
| 106 | in_params[1].type = ACPI_TYPE_INTEGER; |
| 107 | in_params[1].integer.value = state; |
| 108 | |
| 109 | status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL); |
| 110 | if (ACPI_FAILURE(status)) { |
| 111 | printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status); |
| 112 | return -ENODEV; |
| 113 | } |
| 114 | return 0; |
| 115 | } |
| 116 | static ssize_t show_ideapad_cam(struct device *dev, |
| 117 | struct device_attribute *attr, |
| 118 | char *buf) |
| 119 | { |
| 120 | int state = ideapad_dev_get_state(IDEAPAD_DEV_CAMERA); |
| 121 | if (state < 0) |
| 122 | return state; |
| 123 | |
| 124 | return sprintf(buf, "%d\n", state); |
| 125 | } |
| 126 | |
| 127 | static ssize_t store_ideapad_cam(struct device *dev, |
| 128 | struct device_attribute *attr, |
| 129 | const char *buf, size_t count) |
| 130 | { |
| 131 | int ret, state; |
| 132 | |
| 133 | if (!count) |
| 134 | return 0; |
| 135 | if (sscanf(buf, "%i", &state) != 1) |
| 136 | return -EINVAL; |
| 137 | ret = ideapad_dev_set_state(IDEAPAD_DEV_CAMERA, state); |
| 138 | if (ret < 0) |
| 139 | return ret; |
| 140 | return count; |
| 141 | } |
| 142 | |
| 143 | static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam); |
| 144 | |
| 145 | static int ideapad_rfk_set(void *data, bool blocked) |
| 146 | { |
| 147 | int device = (unsigned long)data; |
| 148 | |
| 149 | if (device == IDEAPAD_DEV_KILLSW) |
| 150 | return -EINVAL; |
| 151 | return ideapad_dev_set_state(device, !blocked); |
| 152 | } |
| 153 | |
| 154 | static struct rfkill_ops ideapad_rfk_ops = { |
| 155 | .set_block = ideapad_rfk_set, |
| 156 | }; |
| 157 | |
| 158 | static void ideapad_sync_rfk_state(void) |
| 159 | { |
| 160 | int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW); |
| 161 | int i; |
| 162 | |
| 163 | rfkill_set_hw_state(ideapad_rfkill[IDEAPAD_DEV_KILLSW], hw_blocked); |
| 164 | for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++) |
| 165 | if (ideapad_rfkill[i]) |
| 166 | rfkill_set_hw_state(ideapad_rfkill[i], hw_blocked); |
| 167 | if (hw_blocked) |
| 168 | return; |
| 169 | |
| 170 | for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++) |
| 171 | if (ideapad_rfkill[i]) |
| 172 | rfkill_set_sw_state(ideapad_rfkill[i], !ideapad_dev_get_state(i)); |
| 173 | } |
| 174 | |
| 175 | static int ideapad_register_rfkill(struct acpi_device *device, int dev) |
| 176 | { |
| 177 | int ret; |
| 178 | |
| 179 | ideapad_rfkill[dev] = rfkill_alloc(ideapad_rfk_names[dev], &device->dev, |
| 180 | ideapad_rfk_types[dev], &ideapad_rfk_ops, |
| 181 | (void *)(long)dev); |
| 182 | if (!ideapad_rfkill[dev]) |
| 183 | return -ENOMEM; |
| 184 | |
| 185 | ret = rfkill_register(ideapad_rfkill[dev]); |
| 186 | if (ret) { |
| 187 | rfkill_destroy(ideapad_rfkill[dev]); |
| 188 | return ret; |
| 189 | } |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | static void ideapad_unregister_rfkill(int dev) |
| 194 | { |
| 195 | if (!ideapad_rfkill[dev]) |
| 196 | return; |
| 197 | |
| 198 | rfkill_unregister(ideapad_rfkill[dev]); |
| 199 | rfkill_destroy(ideapad_rfkill[dev]); |
| 200 | } |
| 201 | |
| 202 | static const struct acpi_device_id ideapad_device_ids[] = { |
| 203 | { "VPC2004", 0}, |
| 204 | { "", 0}, |
| 205 | }; |
| 206 | MODULE_DEVICE_TABLE(acpi, ideapad_device_ids); |
| 207 | |
| 208 | static int ideapad_acpi_add(struct acpi_device *device) |
| 209 | { |
| 210 | int i; |
| 211 | int devs_present[5]; |
| 212 | |
| 213 | for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) { |
| 214 | devs_present[i] = ideapad_dev_exists(i); |
| 215 | if (devs_present[i] < 0) |
| 216 | return devs_present[i]; |
| 217 | } |
| 218 | |
| 219 | /* The hardware switch is always present */ |
| 220 | devs_present[IDEAPAD_DEV_KILLSW] = 1; |
| 221 | |
| 222 | if (devs_present[IDEAPAD_DEV_CAMERA]) { |
| 223 | int ret = device_create_file(&device->dev, &dev_attr_camera_power); |
| 224 | if (ret) |
| 225 | return ret; |
| 226 | } |
| 227 | |
| 228 | for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) { |
| 229 | if (!devs_present[i]) |
| 230 | continue; |
| 231 | |
| 232 | ideapad_register_rfkill(device, i); |
| 233 | } |
| 234 | ideapad_sync_rfk_state(); |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | static int ideapad_acpi_remove(struct acpi_device *device, int type) |
| 239 | { |
| 240 | int i; |
| 241 | device_remove_file(&device->dev, &dev_attr_camera_power); |
| 242 | for (i = 0; i < 5; i++) |
| 243 | ideapad_unregister_rfkill(i); |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | static void ideapad_acpi_notify(struct acpi_device *device, u32 event) |
| 248 | { |
| 249 | ideapad_sync_rfk_state(); |
| 250 | } |
| 251 | |
| 252 | static struct acpi_driver ideapad_acpi_driver = { |
| 253 | .name = "ideapad_acpi", |
| 254 | .class = "IdeaPad", |
| 255 | .ids = ideapad_device_ids, |
| 256 | .ops.add = ideapad_acpi_add, |
| 257 | .ops.remove = ideapad_acpi_remove, |
| 258 | .ops.notify = ideapad_acpi_notify, |
| 259 | .owner = THIS_MODULE, |
| 260 | }; |
| 261 | |
| 262 | |
| 263 | static int __init ideapad_acpi_module_init(void) |
| 264 | { |
| 265 | acpi_bus_register_driver(&ideapad_acpi_driver); |
| 266 | |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | |
| 271 | static void __exit ideapad_acpi_module_exit(void) |
| 272 | { |
| 273 | acpi_bus_unregister_driver(&ideapad_acpi_driver); |
| 274 | |
| 275 | } |
| 276 | |
| 277 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); |
| 278 | MODULE_DESCRIPTION("IdeaPad ACPI Extras"); |
| 279 | MODULE_LICENSE("GPL"); |
| 280 | |
| 281 | module_init(ideapad_acpi_module_init); |
| 282 | module_exit(ideapad_acpi_module_exit); |