diff options
author | Benson Leung <bleung@chromium.org> | 2013-10-20 20:58:25 -0700 |
---|---|---|
committer | Olof Johansson <olof@lixom.net> | 2013-11-25 12:51:09 -0800 |
commit | 9ad3692458c387eb9537da73b2b75841ed7acdaf (patch) | |
tree | f9504a0bfb1938ab6d38be5d914e8cbbcfe8a5b6 /drivers/platform | |
parent | ec199dd57ef71858b53828283ac495ed82164933 (diff) | |
download | linux-9ad3692458c387eb9537da73b2b75841ed7acdaf.tar.gz linux-9ad3692458c387eb9537da73b2b75841ed7acdaf.tar.bz2 linux-9ad3692458c387eb9537da73b2b75841ed7acdaf.zip |
platform/chrome: chromeos_laptop - Use deferred probing
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>
Diffstat (limited to 'drivers/platform')
-rw-r--r-- | drivers/platform/chrome/chromeos_laptop.c | 144 |
1 files changed, 101 insertions, 43 deletions
diff --git a/drivers/platform/chrome/chromeos_laptop.c b/drivers/platform/chrome/chromeos_laptop.c index 5c69cfd97ff0..e542330f8048 100644 --- a/drivers/platform/chrome/chromeos_laptop.c +++ b/drivers/platform/chrome/chromeos_laptop.c @@ -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) { - int i; - struct chromeos_laptop *cros_laptop = (void *)id->driver_data; + cros_laptop = (void *)id->driver_data; + pr_debug("DMI Matched %s.\n", id->ident); - pr_debug("Adding peripherals for %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; + 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) |