[PATCH v2 2/2] platform/x86:dell-laptop: remove duplicate code w/ battery function

Andres Salomon
2024-08-15T23:35:50Z

The dell battery patch added dell_send_request_for_tokenid() and
dell_set_std_token_value(), which encapsulates a very common pattern
when SMBIOS queries are addressed to token->location. This calls them
in various places outside of the dell laptop code, allowing us to delete
a bunch of code.

Also some very minor cleanups:
- mark the kbd init functions as __init
- don't read buffer.output unless dell_send_request() was successful.
- actually return errors from micmute_led_set/mute_led_set instead of
always returning 0.

Only minor behavior changes; the delayed read of buffer.output and
actually returning errors for the brightness_set_blocking hooks.

Signed-off-by: Andres Salomon <dilinger@queued.net>

---
Changes in v2:
- use renamed and helper functions dell_send_request_for_tokenid()
and dell_set_std_token_value().
- no longer need to move functions around
- document the brightness_set_blocking hook changes
---
drivers/platform/x86/dell/dell-laptop.c | 105 ++++++------------------
1 file changed, 25 insertions(+), 80 deletions(-)

diff --git a/drivers/platform/x86/dell/dell-laptop.c b/drivers/platform/x86/dell/dell-laptop.c
index 8cc05f0fab91..5df0944e5bf6 100644
--- a/drivers/platform/x86/dell/dell-laptop.c
+++ b/drivers/platform/x86/dell/dell-laptop.c
@@ -935,43 +935,24 @@ static void dell_cleanup_rfkill(void)
static int dell_send_intensity(struct backlight_device *bd)
{
struct calling_interface_buffer buffer;
- struct calling_interface_token *token;
- int ret;
-
- token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
- if (!token)
- return -ENODEV;
-
- dell_fill_request(&buffer,
- token->location, bd->props.brightness, 0, 0);
- if (power_supply_is_system_supplied() > 0)
- ret = dell_send_request(&buffer,
- CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
- else
- ret = dell_send_request(&buffer,
- CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
+ u16 pwr;

- return ret;
+ pwr = power_supply_is_system_supplied() > 0 ?
+ SELECT_TOKEN_AC : SELECT_TOKEN_BAT;
+ return dell_send_request_for_tokenid(&buffer, CLASS_TOKEN_WRITE,
+ pwr, BRIGHTNESS_TOKEN, bd->props.brightness);
}

static int dell_get_intensity(struct backlight_device *bd)
{
struct calling_interface_buffer buffer;
- struct calling_interface_token *token;
int ret;
+ u16 pwr;

- token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
- if (!token)
- return -ENODEV;
-
- dell_fill_request(&buffer, token->location, 0, 0, 0);
- if (power_supply_is_system_supplied() > 0)
- ret = dell_send_request(&buffer,
- CLASS_TOKEN_READ, SELECT_TOKEN_AC);
- else
- ret = dell_send_request(&buffer,
- CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
-
+ pwr = power_supply_is_system_supplied() > 0 ?
+ SELECT_TOKEN_AC : SELECT_TOKEN_BAT;
+ ret = dell_send_request_for_tokenid(&buffer, CLASS_TOKEN_READ, pwr,
+ BRIGHTNESS_TOKEN, 0);
if (ret == 0)
ret = buffer.output[1];

@@ -1395,20 +1376,11 @@ static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
static int kbd_set_token_bit(u8 bit)
{
struct calling_interface_buffer buffer;
- struct calling_interface_token *token;
- int ret;

if (bit >= ARRAY_SIZE(kbd_tokens))
return -EINVAL;

- token = dell_smbios_find_token(kbd_tokens[bit]);
- if (!token)
- return -EINVAL;
-
- dell_fill_request(&buffer, token->location, token->value, 0, 0);
- ret = dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
-
- return ret;
+ return dell_set_std_token_value(&buffer, kbd_tokens[bit], USE_TVAL);
}

static int kbd_get_token_bit(u8 bit)
@@ -1427,11 +1399,10 @@ static int kbd_get_token_bit(u8 bit)

dell_fill_request(&buffer, token->location, 0, 0, 0);
ret = dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD);
- val = buffer.output[1];
-
if (ret)
return ret;

+ val = buffer.output[1];
return (val == token->value);
}

@@ -1537,7 +1508,7 @@ static inline int kbd_init_info(void)

}

-static inline void kbd_init_tokens(void)
+static inline void __init kbd_init_tokens(void)
{
int i;

@@ -1546,7 +1517,7 @@ static inline void kbd_init_tokens(void)
kbd_token_bits |= BIT(i);
}

-static void kbd_init(void)
+static void __init kbd_init(void)
{
int ret;

@@ -2171,21 +2142,11 @@ static int micmute_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct calling_interface_buffer buffer;
- struct calling_interface_token *token;
int state = brightness != LED_OFF;
+ u32 val;

- if (state == 0)
- token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
- else
- token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
-
- if (!token)
- return -ENODEV;
-
- dell_fill_request(&buffer, token->location, token->value, 0, 0);
- dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
-
- return 0;
+ val = state == 0 ? GLOBAL_MIC_MUTE_DISABLE : GLOBAL_MIC_MUTE_ENABLE;
+ return dell_set_std_token_value(&buffer, val, USE_TVAL);
}

static struct led_classdev micmute_led_cdev = {
@@ -2199,21 +2160,11 @@ static int mute_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct calling_interface_buffer buffer;
- struct calling_interface_token *token;
int state = brightness != LED_OFF;
+ u32 val;

- if (state == 0)
- token = dell_smbios_find_token(GLOBAL_MUTE_DISABLE);
- else
- token = dell_smbios_find_token(GLOBAL_MUTE_ENABLE);
-
- if (!token)
- return -ENODEV;
-
- dell_fill_request(&buffer, token->location, token->value, 0, 0);
- dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
-
- return 0;
+ val = state == 0 ? GLOBAL_MUTE_DISABLE : GLOBAL_MUTE_ENABLE;
+ return dell_set_std_token_value(&buffer, val, USE_TVAL);
}

static struct led_classdev mute_led_cdev = {
@@ -2498,7 +2449,7 @@ static void __exit dell_battery_exit(void)

static int __init dell_init(void)
{
- struct calling_interface_token *token;
+ struct calling_interface_buffer buffer;
int max_intensity = 0;
int ret;

@@ -2560,16 +2511,10 @@ static int __init dell_init(void)
if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
return 0;

- token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
- if (token) {
- struct calling_interface_buffer buffer;
-
- dell_fill_request(&buffer, token->location, 0, 0, 0);
- ret = dell_send_request(&buffer,
- CLASS_TOKEN_READ, SELECT_TOKEN_AC);
- if (ret == 0)
- max_intensity = buffer.output[3];
- }
+ ret = dell_send_request_for_tokenid(&buffer, CLASS_TOKEN_READ,
+ SELECT_TOKEN_AC, BRIGHTNESS_TOKEN, 0);
+ if (ret == 0)
+ max_intensity = buffer.output[3];

if (max_intensity) {
struct backlight_properties props;
--
2.39.2

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