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d1381f45 BL |
1 | /* |
2 | * chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices. | |
3 | * | |
4 | * Author : Benson Leung <bleung@chromium.org> | |
5 | * | |
6 | * Copyright (C) 2012 Google, Inc. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/dmi.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/module.h> | |
27 | ||
8e1ad4c4 BL |
28 | #define ATMEL_TP_I2C_ADDR 0x4b |
29 | #define ATMEL_TP_I2C_BL_ADDR 0x25 | |
d1381f45 BL |
30 | #define CYAPA_TP_I2C_ADDR 0x67 |
31 | #define ISL_ALS_I2C_ADDR 0x44 | |
aabf3f44 | 32 | #define TAOS_ALS_I2C_ADDR 0x29 |
d1381f45 BL |
33 | |
34 | static struct i2c_client *als; | |
35 | static struct i2c_client *tp; | |
36 | ||
37 | const char *i2c_adapter_names[] = { | |
38 | "SMBus I801 adapter", | |
39 | }; | |
40 | ||
41 | /* Keep this enum consistent with i2c_adapter_names */ | |
42 | enum i2c_adapter_type { | |
43 | I2C_ADAPTER_SMBUS = 0, | |
44 | }; | |
45 | ||
46 | static struct i2c_board_info __initdata cyapa_device = { | |
47 | I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR), | |
48 | .flags = I2C_CLIENT_WAKE, | |
49 | }; | |
50 | ||
51 | static struct i2c_board_info __initdata isl_als_device = { | |
52 | I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR), | |
53 | }; | |
54 | ||
8016bcbc BL |
55 | static struct i2c_board_info __initdata tsl2583_als_device = { |
56 | I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR), | |
57 | }; | |
58 | ||
aabf3f44 BL |
59 | static struct i2c_board_info __initdata tsl2563_als_device = { |
60 | I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR), | |
61 | }; | |
62 | ||
8e1ad4c4 BL |
63 | static struct i2c_board_info __initdata atmel_224s_tp_device = { |
64 | I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR), | |
65 | .platform_data = NULL, | |
66 | .flags = I2C_CLIENT_WAKE, | |
67 | }; | |
68 | ||
d1381f45 BL |
69 | static struct i2c_client __init *__add_probed_i2c_device( |
70 | const char *name, | |
71 | int bus, | |
72 | struct i2c_board_info *info, | |
73 | const unsigned short *addrs) | |
74 | { | |
75 | const struct dmi_device *dmi_dev; | |
76 | const struct dmi_dev_onboard *dev_data; | |
77 | struct i2c_adapter *adapter; | |
78 | struct i2c_client *client; | |
79 | ||
80 | if (bus < 0) | |
81 | return NULL; | |
82 | /* | |
83 | * If a name is specified, look for irq platform information stashed | |
84 | * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware. | |
85 | */ | |
86 | if (name) { | |
87 | dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL); | |
88 | if (!dmi_dev) { | |
89 | pr_err("%s failed to dmi find device %s.\n", | |
90 | __func__, | |
91 | name); | |
92 | return NULL; | |
93 | } | |
94 | dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data; | |
95 | if (!dev_data) { | |
96 | pr_err("%s failed to get data from dmi for %s.\n", | |
97 | __func__, name); | |
98 | return NULL; | |
99 | } | |
100 | info->irq = dev_data->instance; | |
101 | } | |
102 | ||
103 | adapter = i2c_get_adapter(bus); | |
104 | if (!adapter) { | |
105 | pr_err("%s failed to get i2c adapter %d.\n", __func__, bus); | |
106 | return NULL; | |
107 | } | |
108 | ||
109 | /* add the i2c device */ | |
110 | client = i2c_new_probed_device(adapter, info, addrs, NULL); | |
111 | if (!client) | |
112 | pr_err("%s failed to register device %d-%02x\n", | |
113 | __func__, bus, info->addr); | |
114 | else | |
115 | pr_debug("%s added i2c device %d-%02x\n", | |
116 | __func__, bus, info->addr); | |
117 | ||
118 | i2c_put_adapter(adapter); | |
119 | return client; | |
120 | } | |
121 | ||
122 | static int __init __find_i2c_adap(struct device *dev, void *data) | |
123 | { | |
124 | const char *name = data; | |
125 | static const char *prefix = "i2c-"; | |
126 | struct i2c_adapter *adapter; | |
127 | if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0) | |
128 | return 0; | |
129 | adapter = to_i2c_adapter(dev); | |
130 | return (strncmp(adapter->name, name, strlen(name)) == 0); | |
131 | } | |
132 | ||
133 | static int __init find_i2c_adapter_num(enum i2c_adapter_type type) | |
134 | { | |
135 | struct device *dev = NULL; | |
136 | struct i2c_adapter *adapter; | |
137 | const char *name = i2c_adapter_names[type]; | |
138 | /* find the adapter by name */ | |
139 | dev = bus_find_device(&i2c_bus_type, NULL, (void *)name, | |
140 | __find_i2c_adap); | |
141 | if (!dev) { | |
142 | pr_err("%s: i2c adapter %s not found on system.\n", __func__, | |
143 | name); | |
144 | return -ENODEV; | |
145 | } | |
146 | adapter = to_i2c_adapter(dev); | |
147 | return adapter->nr; | |
148 | } | |
149 | ||
150 | /* | |
151 | * Probes for a device at a single address, the one provided by | |
152 | * info->addr. | |
153 | * Returns NULL if no device found. | |
154 | */ | |
155 | static struct i2c_client __init *add_smbus_device(const char *name, | |
156 | struct i2c_board_info *info) | |
157 | { | |
158 | const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END }; | |
159 | return __add_probed_i2c_device(name, | |
160 | find_i2c_adapter_num(I2C_ADAPTER_SMBUS), | |
161 | info, | |
162 | addr_list); | |
163 | } | |
164 | ||
6e71094d | 165 | static int __init setup_cyapa_smbus_tp(const struct dmi_system_id *id) |
d1381f45 BL |
166 | { |
167 | /* add cyapa touchpad on smbus */ | |
168 | tp = add_smbus_device("trackpad", &cyapa_device); | |
169 | return 0; | |
170 | } | |
171 | ||
8e1ad4c4 BL |
172 | static int __init setup_atmel_224s_tp(const struct dmi_system_id *id) |
173 | { | |
174 | const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR, | |
175 | ATMEL_TP_I2C_ADDR, | |
176 | I2C_CLIENT_END }; | |
177 | ||
178 | /* add atmel mxt touchpad on VGA DDC GMBus */ | |
179 | tp = add_probed_i2c_device("trackpad", I2C_ADAPTER_VGADDC, | |
180 | &atmel_224s_tp_device, addr_list); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | ||
d1381f45 BL |
185 | static int __init setup_isl29018_als(const struct dmi_system_id *id) |
186 | { | |
187 | /* add isl29018 light sensor */ | |
188 | als = add_smbus_device("lightsensor", &isl_als_device); | |
189 | return 0; | |
190 | } | |
191 | ||
8016bcbc BL |
192 | static int __init setup_tsl2583_als(const struct dmi_system_id *id) |
193 | { | |
194 | /* add tsl2583 light sensor on smbus */ | |
195 | als = add_smbus_device(NULL, &tsl2583_als_device); | |
196 | return 0; | |
197 | } | |
198 | ||
aabf3f44 BL |
199 | static int __init setup_tsl2563_als(const struct dmi_system_id *id) |
200 | { | |
201 | /* add tsl2563 light sensor on smbus */ | |
202 | als = add_smbus_device(NULL, &tsl2563_als_device); | |
203 | return 0; | |
204 | } | |
205 | ||
d1381f45 BL |
206 | static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = { |
207 | { | |
208 | .ident = "Samsung Series 5 550 - Touchpad", | |
209 | .matches = { | |
210 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"), | |
211 | DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"), | |
212 | }, | |
6e71094d | 213 | .callback = setup_cyapa_smbus_tp, |
d1381f45 | 214 | }, |
8e1ad4c4 BL |
215 | { |
216 | .ident = "Chromebook Pixel - Touchpad", | |
217 | .matches = { | |
218 | DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), | |
219 | DMI_MATCH(DMI_PRODUCT_NAME, "Link"), | |
220 | }, | |
221 | .callback = setup_atmel_224s_tp, | |
222 | }, | |
d1381f45 BL |
223 | { |
224 | .ident = "Samsung Series 5 550 - Light Sensor", | |
225 | .matches = { | |
226 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"), | |
227 | DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"), | |
228 | }, | |
229 | .callback = setup_isl29018_als, | |
230 | }, | |
261f171f BL |
231 | { |
232 | .ident = "Acer C7 Chromebook - Touchpad", | |
233 | .matches = { | |
234 | DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"), | |
235 | }, | |
236 | .callback = setup_cyapa_smbus_tp, | |
e65a624b BL |
237 | }, |
238 | { | |
239 | .ident = "HP Pavilion 14 Chromebook - Touchpad", | |
240 | .matches = { | |
241 | DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"), | |
242 | }, | |
243 | .callback = setup_cyapa_smbus_tp, | |
261f171f | 244 | }, |
8016bcbc BL |
245 | { |
246 | .ident = "Samsung Series 5 - Light Sensor", | |
247 | .matches = { | |
248 | DMI_MATCH(DMI_PRODUCT_NAME, "Alex"), | |
249 | }, | |
250 | .callback = setup_tsl2583_als, | |
251 | }, | |
aabf3f44 BL |
252 | { |
253 | .ident = "Cr-48 - Light Sensor", | |
254 | .matches = { | |
255 | DMI_MATCH(DMI_PRODUCT_NAME, "Mario"), | |
256 | }, | |
257 | .callback = setup_tsl2563_als, | |
258 | }, | |
259 | { | |
260 | .ident = "Acer AC700 - Light Sensor", | |
261 | .matches = { | |
262 | DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), | |
263 | }, | |
264 | .callback = setup_tsl2563_als, | |
265 | }, | |
d1381f45 BL |
266 | { } |
267 | }; | |
268 | MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table); | |
269 | ||
270 | static int __init chromeos_laptop_init(void) | |
271 | { | |
272 | if (!dmi_check_system(chromeos_laptop_dmi_table)) { | |
273 | pr_debug("%s unsupported system.\n", __func__); | |
274 | return -ENODEV; | |
275 | } | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static void __exit chromeos_laptop_exit(void) | |
280 | { | |
281 | if (als) | |
282 | i2c_unregister_device(als); | |
283 | if (tp) | |
284 | i2c_unregister_device(tp); | |
285 | } | |
286 | ||
287 | module_init(chromeos_laptop_init); | |
288 | module_exit(chromeos_laptop_exit); | |
289 | ||
290 | MODULE_DESCRIPTION("Chrome OS Laptop driver"); | |
291 | MODULE_AUTHOR("Benson Leung <bleung@chromium.org>"); | |
292 | MODULE_LICENSE("GPL"); |