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platform/chrome: chromeos_laptop - Use deferred probing

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Further refactor chromeos_laptop, adding a probe function.
Init will call dmi_check_system, but will only use the match to select
a chromeos_laptop structure of the current board.

Probe will add the devices, and on errors return -EPROBE_DEFER.
If i2c adapters are loaded after chromeos_laptop inits, the deferred
probe will instantiate the peripherals when the bus appears.

Signed-off-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Benson Leung 2013-10-20 20:58:25 -07:00 committed by Olof Johansson
parent ec199dd57e
commit 9ad3692458
1 changed files with 101 additions and 43 deletions
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144
drivers/platform/chrome/chromeos_laptop.c
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@ -27,6 +27,7 @@
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#define ATMEL_TP_I2C_ADDR 0x4b
#define ATMEL_TP_I2C_BL_ADDR 0x25
@ -54,7 +55,7 @@ enum i2c_adapter_type {
};
struct i2c_peripheral {
void (*add)(enum i2c_adapter_type type);
int (*add)(enum i2c_adapter_type type);
enum i2c_adapter_type type;
};
@ -64,20 +65,22 @@ struct chromeos_laptop {
struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
};
static struct i2c_board_info __initdata cyapa_device = {
static struct chromeos_laptop *cros_laptop;
static struct i2c_board_info cyapa_device = {
I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
.flags = I2C_CLIENT_WAKE,
};
static struct i2c_board_info __initdata isl_als_device = {
static struct i2c_board_info isl_als_device = {
I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
};
static struct i2c_board_info __initdata tsl2583_als_device = {
static struct i2c_board_info tsl2583_als_device = {
I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
};
static struct i2c_board_info __initdata tsl2563_als_device = {
static struct i2c_board_info tsl2563_als_device = {
I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
};
@ -100,7 +103,7 @@ static struct mxt_platform_data atmel_224s_tp_platform_data = {
.config_length = 0,
};
static struct i2c_board_info __initdata atmel_224s_tp_device = {
static struct i2c_board_info atmel_224s_tp_device = {
I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
.platform_data = &atmel_224s_tp_platform_data,
.flags = I2C_CLIENT_WAKE,
@ -121,13 +124,13 @@ static struct mxt_platform_data atmel_1664s_platform_data = {
.config_length = 0,
};
static struct i2c_board_info __initdata atmel_1664s_device = {
static struct i2c_board_info atmel_1664s_device = {
I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
.platform_data = &atmel_1664s_platform_data,
.flags = I2C_CLIENT_WAKE,
};
static struct i2c_client __init *__add_probed_i2c_device(
static struct i2c_client *__add_probed_i2c_device(
const char *name,
int bus,
struct i2c_board_info *info,
@ -180,7 +183,7 @@ static struct i2c_client __init *__add_probed_i2c_device(
return client;
}
static int __init __find_i2c_adap(struct device *dev, void *data)
static int __find_i2c_adap(struct device *dev, void *data)
{
const char *name = data;
static const char *prefix = "i2c-";
@ -191,7 +194,7 @@ static int __init __find_i2c_adap(struct device *dev, void *data)
return (strncmp(adapter->name, name, strlen(name)) == 0);
}
static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
static int find_i2c_adapter_num(enum i2c_adapter_type type)
{
struct device *dev = NULL;
struct i2c_adapter *adapter;
@ -200,8 +203,9 @@ static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
dev = bus_find_device(&i2c_bus_type, NULL, (void *)name,
__find_i2c_adap);
if (!dev) {
pr_err("%s: i2c adapter %s not found on system.\n", __func__,
name);
/* Adapters may appear later. Deferred probing will retry */
pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
name);
return -ENODEV;
}
adapter = to_i2c_adapter(dev);
@ -216,7 +220,7 @@ static int __init find_i2c_adapter_num(enum i2c_adapter_type type)
* Returns NULL if no devices found.
* See Documentation/i2c/instantiating-devices for more information.
*/
static __init struct i2c_client *add_probed_i2c_device(
static struct i2c_client *add_probed_i2c_device(
const char *name,
enum i2c_adapter_type type,
struct i2c_board_info *info,
@ -233,7 +237,7 @@ static __init struct i2c_client *add_probed_i2c_device(
* info->addr.
* Returns NULL if no device found.
*/
static __init struct i2c_client *add_i2c_device(const char *name,
static struct i2c_client *add_i2c_device(const char *name,
enum i2c_adapter_type type,
struct i2c_board_info *info)
{
@ -244,65 +248,87 @@ static __init struct i2c_client *add_i2c_device(const char *name,
addr_list);
}
static int __init setup_cyapa_tp(enum i2c_adapter_type type)
static int setup_cyapa_tp(enum i2c_adapter_type type)
{
if (tp)
return 0;
/* add cyapa touchpad */
tp = add_i2c_device("trackpad", type, &cyapa_device);
return 0;
return (!tp) ? -EAGAIN : 0;
}
static int __init setup_atmel_224s_tp(enum i2c_adapter_type type)
static int setup_atmel_224s_tp(enum i2c_adapter_type type)
{
const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
ATMEL_TP_I2C_ADDR,
I2C_CLIENT_END };
if (tp)
return 0;
/* add atmel mxt touchpad */
tp = add_probed_i2c_device("trackpad", type,
&atmel_224s_tp_device, addr_list);
return 0;
return (!tp) ? -EAGAIN : 0;
}
static int __init setup_atmel_1664s_ts(enum i2c_adapter_type type)
static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
{
const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
ATMEL_TS_I2C_ADDR,
I2C_CLIENT_END };
if (ts)
return 0;
/* add atmel mxt touch device */
ts = add_probed_i2c_device("touchscreen", type,
&atmel_1664s_device, addr_list);
return 0;
return (!ts) ? -EAGAIN : 0;
}
static int __init setup_isl29018_als(enum i2c_adapter_type type)
static int setup_isl29018_als(enum i2c_adapter_type type)
{
if (als)
return 0;
/* add isl29018 light sensor */
als = add_i2c_device("lightsensor", type, &isl_als_device);
return 0;
return (!als) ? -EAGAIN : 0;
}
static int __init setup_tsl2583_als(enum i2c_adapter_type type)
static int setup_tsl2583_als(enum i2c_adapter_type type)
{
if (als)
return 0;
/* add tsl2583 light sensor */
als = add_i2c_device(NULL, type, &tsl2583_als_device);
return 0;
return (!als) ? -EAGAIN : 0;
}
static int __init setup_tsl2563_als(enum i2c_adapter_type type)
static int setup_tsl2563_als(enum i2c_adapter_type type)
{
if (als)
return 0;
/* add tsl2563 light sensor */
als = add_i2c_device(NULL, type, &tsl2563_als_device);
return 0;
return (!als) ? -EAGAIN : 0;
}
static int __init
chromeos_laptop_add_peripherals(const struct dmi_system_id *id)
static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
{
cros_laptop = (void *)id->driver_data;
pr_debug("DMI Matched %s.\n", id->ident);
/* Indicate to dmi_scan that processing is done. */
return 1;
}
static int chromeos_laptop_probe(struct platform_device *pdev)
{
int i;
struct chromeos_laptop *cros_laptop = (void *)id->driver_data;
pr_debug("Adding peripherals for %s.\n", id->ident);
int ret = 0;
for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
struct i2c_peripheral *i2c_dev;
@ -313,15 +339,15 @@ chromeos_laptop_add_peripherals(const struct dmi_system_id *id)
if (i2c_dev->add == NULL)
break;
/* Add the device. */
i2c_dev->add(i2c_dev->type);
/* Add the device. Set -EPROBE_DEFER on any failure */
if (i2c_dev->add(i2c_dev->type))
ret = -EPROBE_DEFER;
}
/* Indicate to dmi_scan that processing is done. */
return 1;
return ret;
}
static struct chromeos_laptop samsung_series_5_550 __initdata = {
static struct chromeos_laptop samsung_series_5_550 = {
.i2c_peripherals = {
/* Touchpad. */
{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
@ -330,14 +356,14 @@ static struct chromeos_laptop samsung_series_5_550 __initdata = {
},
};
static struct chromeos_laptop samsung_series_5 __initdata = {
static struct chromeos_laptop samsung_series_5 = {
.i2c_peripherals = {
/* Light Sensor. */
{ .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
},
};
static struct chromeos_laptop chromebook_pixel __initdata = {
static struct chromeos_laptop chromebook_pixel = {
.i2c_peripherals = {
/* Touch Screen. */
{ .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
@ -348,28 +374,28 @@ static struct chromeos_laptop chromebook_pixel __initdata = {
},
};
static struct chromeos_laptop acer_c7_chromebook __initdata = {
static struct chromeos_laptop acer_c7_chromebook = {
.i2c_peripherals = {
/* Touchpad. */
{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
},
};
static struct chromeos_laptop acer_ac700 __initdata = {
static struct chromeos_laptop acer_ac700 = {
.i2c_peripherals = {
/* Light Sensor. */
{ .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
},
};
static struct chromeos_laptop hp_pavilion_14_chromebook __initdata = {
static struct chromeos_laptop hp_pavilion_14_chromebook = {
.i2c_peripherals = {
/* Touchpad. */
{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
},
};
static struct chromeos_laptop cr48 __initdata = {
static struct chromeos_laptop cr48 = {
.i2c_peripherals = {
/* Light Sensor. */
{ .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
@ -377,7 +403,7 @@ static struct chromeos_laptop cr48 __initdata = {
};
#define _CBDD(board_) \
.callback = &chromeos_laptop_add_peripherals, \
.callback = chromeos_laptop_dmi_matched, \
.driver_data = (void *)&board_
static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = {
@ -436,13 +462,45 @@ static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = {
};
MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
static struct platform_device *cros_platform_device;
static struct platform_driver cros_platform_driver = {
.driver = {
.name = "chromeos_laptop",
.owner = THIS_MODULE,
},
.probe = chromeos_laptop_probe,
};
static int __init chromeos_laptop_init(void)
{
int ret;
if (!dmi_check_system(chromeos_laptop_dmi_table)) {
pr_debug("%s unsupported system.\n", __func__);
return -ENODEV;
}
ret = platform_driver_register(&cros_platform_driver);
if (ret)
return ret;
cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
if (!cros_platform_device) {
ret = -ENOMEM;
goto fail_platform_device1;
}
ret = platform_device_add(cros_platform_device);
if (ret)
goto fail_platform_device2;
return 0;
fail_platform_device2:
platform_device_put(cros_platform_device);
fail_platform_device1:
platform_driver_unregister(&cros_platform_driver);
return ret;
}
static void __exit chromeos_laptop_exit(void)