2 * chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
4 * Author : Benson Leung <bleung@chromium.org>
6 * Copyright (C) 2012 Google, Inc.
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.
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.
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
24 #include <linux/dmi.h>
25 #include <linux/i2c.h>
26 #include <linux/i2c/atmel_mxt_ts.h>
27 #include <linux/input.h>
28 #include <linux/interrupt.h>
29 #include <linux/module.h>
30 #include <linux/platform_device.h>
32 #define ATMEL_TP_I2C_ADDR 0x4b
33 #define ATMEL_TP_I2C_BL_ADDR 0x25
34 #define ATMEL_TS_I2C_ADDR 0x4a
35 #define ATMEL_TS_I2C_BL_ADDR 0x26
36 #define CYAPA_TP_I2C_ADDR 0x67
37 #define ISL_ALS_I2C_ADDR 0x44
38 #define TAOS_ALS_I2C_ADDR 0x29
40 #define MAX_I2C_DEVICE_DEFERRALS 5
42 static struct i2c_client
*als
;
43 static struct i2c_client
*tp
;
44 static struct i2c_client
*ts
;
46 static const char *i2c_adapter_names
[] = {
54 /* Keep this enum consistent with i2c_adapter_names */
55 enum i2c_adapter_type
{
56 I2C_ADAPTER_SMBUS
= 0,
59 I2C_ADAPTER_DESIGNWARE_0
,
60 I2C_ADAPTER_DESIGNWARE_1
,
63 enum i2c_peripheral_state
{
69 struct i2c_peripheral
{
70 int (*add
)(enum i2c_adapter_type type
);
71 enum i2c_adapter_type type
;
72 enum i2c_peripheral_state state
;
76 #define MAX_I2C_PERIPHERALS 3
78 struct chromeos_laptop
{
79 struct i2c_peripheral i2c_peripherals
[MAX_I2C_PERIPHERALS
];
82 static struct chromeos_laptop
*cros_laptop
;
84 static struct i2c_board_info cyapa_device
= {
85 I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR
),
86 .flags
= I2C_CLIENT_WAKE
,
89 static struct i2c_board_info isl_als_device
= {
90 I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR
),
93 static struct i2c_board_info tsl2583_als_device
= {
94 I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR
),
97 static struct i2c_board_info tsl2563_als_device
= {
98 I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR
),
101 static int mxt_t19_keys
[] = {
110 static struct mxt_platform_data atmel_224s_tp_platform_data
= {
111 .irqflags
= IRQF_TRIGGER_FALLING
,
112 .t19_num_keys
= ARRAY_SIZE(mxt_t19_keys
),
113 .t19_keymap
= mxt_t19_keys
,
116 static struct i2c_board_info atmel_224s_tp_device
= {
117 I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR
),
118 .platform_data
= &atmel_224s_tp_platform_data
,
119 .flags
= I2C_CLIENT_WAKE
,
122 static struct mxt_platform_data atmel_1664s_platform_data
= {
123 .irqflags
= IRQF_TRIGGER_FALLING
,
126 static struct i2c_board_info atmel_1664s_device
= {
127 I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR
),
128 .platform_data
= &atmel_1664s_platform_data
,
129 .flags
= I2C_CLIENT_WAKE
,
132 static struct i2c_client
*__add_probed_i2c_device(
135 struct i2c_board_info
*info
,
136 const unsigned short *addrs
)
138 const struct dmi_device
*dmi_dev
;
139 const struct dmi_dev_onboard
*dev_data
;
140 struct i2c_adapter
*adapter
;
141 struct i2c_client
*client
;
146 * If a name is specified, look for irq platform information stashed
147 * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
150 dmi_dev
= dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD
, name
, NULL
);
152 pr_err("%s failed to dmi find device %s.\n",
157 dev_data
= (struct dmi_dev_onboard
*)dmi_dev
->device_data
;
159 pr_err("%s failed to get data from dmi for %s.\n",
163 info
->irq
= dev_data
->instance
;
166 adapter
= i2c_get_adapter(bus
);
168 pr_err("%s failed to get i2c adapter %d.\n", __func__
, bus
);
172 /* add the i2c device */
173 client
= i2c_new_probed_device(adapter
, info
, addrs
, NULL
);
175 pr_notice("%s failed to register device %d-%02x\n",
176 __func__
, bus
, info
->addr
);
178 pr_debug("%s added i2c device %d-%02x\n",
179 __func__
, bus
, info
->addr
);
181 i2c_put_adapter(adapter
);
191 static int __find_i2c_adap(struct device
*dev
, void *data
)
193 struct i2c_lookup
*lookup
= data
;
194 static const char *prefix
= "i2c-";
195 struct i2c_adapter
*adapter
;
197 if (strncmp(dev_name(dev
), prefix
, strlen(prefix
)) != 0)
199 adapter
= to_i2c_adapter(dev
);
200 if (strncmp(adapter
->name
, lookup
->name
, strlen(lookup
->name
)) == 0 &&
201 lookup
->n
++ == lookup
->instance
)
206 static int find_i2c_adapter_num(enum i2c_adapter_type type
)
208 struct device
*dev
= NULL
;
209 struct i2c_adapter
*adapter
;
210 struct i2c_lookup lookup
;
212 memset(&lookup
, 0, sizeof(lookup
));
213 lookup
.name
= i2c_adapter_names
[type
];
214 lookup
.instance
= (type
== I2C_ADAPTER_DESIGNWARE_1
) ? 1 : 0;
216 /* find the adapter by name */
217 dev
= bus_find_device(&i2c_bus_type
, NULL
, &lookup
, __find_i2c_adap
);
219 /* Adapters may appear later. Deferred probing will retry */
220 pr_notice("%s: i2c adapter %s not found on system.\n", __func__
,
224 adapter
= to_i2c_adapter(dev
);
229 * Takes a list of addresses in addrs as such :
230 * { addr1, ... , addrn, I2C_CLIENT_END };
231 * add_probed_i2c_device will use i2c_new_probed_device
232 * and probe for devices at all of the addresses listed.
233 * Returns NULL if no devices found.
234 * See Documentation/i2c/instantiating-devices for more information.
236 static struct i2c_client
*add_probed_i2c_device(
238 enum i2c_adapter_type type
,
239 struct i2c_board_info
*info
,
240 const unsigned short *addrs
)
242 return __add_probed_i2c_device(name
,
243 find_i2c_adapter_num(type
),
249 * Probes for a device at a single address, the one provided by
251 * Returns NULL if no device found.
253 static struct i2c_client
*add_i2c_device(const char *name
,
254 enum i2c_adapter_type type
,
255 struct i2c_board_info
*info
)
257 const unsigned short addr_list
[] = { info
->addr
, I2C_CLIENT_END
};
259 return __add_probed_i2c_device(name
,
260 find_i2c_adapter_num(type
),
265 static int setup_cyapa_tp(enum i2c_adapter_type type
)
270 /* add cyapa touchpad */
271 tp
= add_i2c_device("trackpad", type
, &cyapa_device
);
272 return (!tp
) ? -EAGAIN
: 0;
275 static int setup_atmel_224s_tp(enum i2c_adapter_type type
)
277 const unsigned short addr_list
[] = { ATMEL_TP_I2C_BL_ADDR
,
283 /* add atmel mxt touchpad */
284 tp
= add_probed_i2c_device("trackpad", type
,
285 &atmel_224s_tp_device
, addr_list
);
286 return (!tp
) ? -EAGAIN
: 0;
289 static int setup_atmel_1664s_ts(enum i2c_adapter_type type
)
291 const unsigned short addr_list
[] = { ATMEL_TS_I2C_BL_ADDR
,
297 /* add atmel mxt touch device */
298 ts
= add_probed_i2c_device("touchscreen", type
,
299 &atmel_1664s_device
, addr_list
);
300 return (!ts
) ? -EAGAIN
: 0;
303 static int setup_isl29018_als(enum i2c_adapter_type type
)
308 /* add isl29018 light sensor */
309 als
= add_i2c_device("lightsensor", type
, &isl_als_device
);
310 return (!als
) ? -EAGAIN
: 0;
313 static int setup_tsl2583_als(enum i2c_adapter_type type
)
318 /* add tsl2583 light sensor */
319 als
= add_i2c_device(NULL
, type
, &tsl2583_als_device
);
320 return (!als
) ? -EAGAIN
: 0;
323 static int setup_tsl2563_als(enum i2c_adapter_type type
)
328 /* add tsl2563 light sensor */
329 als
= add_i2c_device(NULL
, type
, &tsl2563_als_device
);
330 return (!als
) ? -EAGAIN
: 0;
333 static int __init
chromeos_laptop_dmi_matched(const struct dmi_system_id
*id
)
335 cros_laptop
= (void *)id
->driver_data
;
336 pr_debug("DMI Matched %s.\n", id
->ident
);
338 /* Indicate to dmi_scan that processing is done. */
342 static int chromeos_laptop_probe(struct platform_device
*pdev
)
347 for (i
= 0; i
< MAX_I2C_PERIPHERALS
; i
++) {
348 struct i2c_peripheral
*i2c_dev
;
350 i2c_dev
= &cros_laptop
->i2c_peripherals
[i
];
352 /* No more peripherals. */
353 if (i2c_dev
->add
== NULL
)
356 if (i2c_dev
->state
== TIMEDOUT
|| i2c_dev
->state
== PROBED
)
360 * Check that the i2c adapter is present.
361 * -EPROBE_DEFER if missing as the adapter may appear much
364 if (find_i2c_adapter_num(i2c_dev
->type
) == -ENODEV
) {
369 /* Add the device. */
370 if (i2c_dev
->add(i2c_dev
->type
) == -EAGAIN
) {
372 * Set -EPROBE_DEFER a limited num of times
373 * if device is not successfully added.
375 if (++i2c_dev
->tries
< MAX_I2C_DEVICE_DEFERRALS
) {
378 /* Ran out of tries. */
379 pr_notice("%s: Ran out of tries for device.\n",
381 i2c_dev
->state
= TIMEDOUT
;
384 i2c_dev
->state
= PROBED
;
391 static struct chromeos_laptop samsung_series_5_550
= {
394 { .add
= setup_cyapa_tp
, I2C_ADAPTER_SMBUS
},
396 { .add
= setup_isl29018_als
, I2C_ADAPTER_SMBUS
},
400 static struct chromeos_laptop samsung_series_5
= {
403 { .add
= setup_tsl2583_als
, I2C_ADAPTER_SMBUS
},
407 static struct chromeos_laptop chromebook_pixel
= {
410 { .add
= setup_atmel_1664s_ts
, I2C_ADAPTER_PANEL
},
412 { .add
= setup_atmel_224s_tp
, I2C_ADAPTER_VGADDC
},
414 { .add
= setup_isl29018_als
, I2C_ADAPTER_PANEL
},
418 static struct chromeos_laptop hp_chromebook_14
= {
421 { .add
= setup_cyapa_tp
, I2C_ADAPTER_DESIGNWARE_0
},
425 static struct chromeos_laptop dell_chromebook_11
= {
428 { .add
= setup_cyapa_tp
, I2C_ADAPTER_DESIGNWARE_0
},
432 static struct chromeos_laptop toshiba_cb35
= {
435 { .add
= setup_cyapa_tp
, I2C_ADAPTER_DESIGNWARE_0
},
439 static struct chromeos_laptop acer_c7_chromebook
= {
442 { .add
= setup_cyapa_tp
, I2C_ADAPTER_SMBUS
},
446 static struct chromeos_laptop acer_ac700
= {
449 { .add
= setup_tsl2563_als
, I2C_ADAPTER_SMBUS
},
453 static struct chromeos_laptop acer_c720
= {
456 { .add
= setup_atmel_1664s_ts
, I2C_ADAPTER_DESIGNWARE_1
},
458 { .add
= setup_cyapa_tp
, I2C_ADAPTER_DESIGNWARE_0
},
460 { .add
= setup_isl29018_als
, I2C_ADAPTER_DESIGNWARE_1
},
464 static struct chromeos_laptop hp_pavilion_14_chromebook
= {
467 { .add
= setup_cyapa_tp
, I2C_ADAPTER_SMBUS
},
471 static struct chromeos_laptop cr48
= {
474 { .add
= setup_tsl2563_als
, I2C_ADAPTER_SMBUS
},
478 #define _CBDD(board_) \
479 .callback = chromeos_laptop_dmi_matched, \
480 .driver_data = (void *)&board_
482 static struct dmi_system_id chromeos_laptop_dmi_table
[] __initdata
= {
484 .ident
= "Samsung Series 5 550",
486 DMI_MATCH(DMI_SYS_VENDOR
, "SAMSUNG"),
487 DMI_MATCH(DMI_PRODUCT_NAME
, "Lumpy"),
489 _CBDD(samsung_series_5_550
),
492 .ident
= "Samsung Series 5",
494 DMI_MATCH(DMI_PRODUCT_NAME
, "Alex"),
496 _CBDD(samsung_series_5
),
499 .ident
= "Chromebook Pixel",
501 DMI_MATCH(DMI_SYS_VENDOR
, "GOOGLE"),
502 DMI_MATCH(DMI_PRODUCT_NAME
, "Link"),
504 _CBDD(chromebook_pixel
),
509 DMI_MATCH(DMI_BIOS_VENDOR
, "coreboot"),
510 DMI_MATCH(DMI_PRODUCT_NAME
, "Wolf"),
512 _CBDD(dell_chromebook_11
),
515 .ident
= "HP Chromebook 14",
517 DMI_MATCH(DMI_BIOS_VENDOR
, "coreboot"),
518 DMI_MATCH(DMI_PRODUCT_NAME
, "Falco"),
520 _CBDD(hp_chromebook_14
),
523 .ident
= "Toshiba CB35",
525 DMI_MATCH(DMI_BIOS_VENDOR
, "coreboot"),
526 DMI_MATCH(DMI_PRODUCT_NAME
, "Leon"),
531 .ident
= "Acer C7 Chromebook",
533 DMI_MATCH(DMI_PRODUCT_NAME
, "Parrot"),
535 _CBDD(acer_c7_chromebook
),
538 .ident
= "Acer AC700",
540 DMI_MATCH(DMI_PRODUCT_NAME
, "ZGB"),
545 .ident
= "Acer C720",
547 DMI_MATCH(DMI_PRODUCT_NAME
, "Peppy"),
552 .ident
= "HP Pavilion 14 Chromebook",
554 DMI_MATCH(DMI_PRODUCT_NAME
, "Butterfly"),
556 _CBDD(hp_pavilion_14_chromebook
),
561 DMI_MATCH(DMI_PRODUCT_NAME
, "Mario"),
567 MODULE_DEVICE_TABLE(dmi
, chromeos_laptop_dmi_table
);
569 static struct platform_device
*cros_platform_device
;
571 static struct platform_driver cros_platform_driver
= {
573 .name
= "chromeos_laptop",
574 .owner
= THIS_MODULE
,
576 .probe
= chromeos_laptop_probe
,
579 static int __init
chromeos_laptop_init(void)
583 if (!dmi_check_system(chromeos_laptop_dmi_table
)) {
584 pr_debug("%s unsupported system.\n", __func__
);
588 ret
= platform_driver_register(&cros_platform_driver
);
592 cros_platform_device
= platform_device_alloc("chromeos_laptop", -1);
593 if (!cros_platform_device
) {
595 goto fail_platform_device1
;
598 ret
= platform_device_add(cros_platform_device
);
600 goto fail_platform_device2
;
604 fail_platform_device2
:
605 platform_device_put(cros_platform_device
);
606 fail_platform_device1
:
607 platform_driver_unregister(&cros_platform_driver
);
611 static void __exit
chromeos_laptop_exit(void)
614 i2c_unregister_device(als
);
616 i2c_unregister_device(tp
);
618 i2c_unregister_device(ts
);
620 platform_device_unregister(cros_platform_device
);
621 platform_driver_unregister(&cros_platform_driver
);
624 module_init(chromeos_laptop_init
);
625 module_exit(chromeos_laptop_exit
);
627 MODULE_DESCRIPTION("Chrome OS Laptop driver");
628 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
629 MODULE_LICENSE("GPL");