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linux/drivers/hwmon/oxp-sensors.c
Nathan Chancellor 98845e7753 hwmon: (oxp-sensors) Add missing breaks to fix -Wimplicit-fallthrough with clang 
clang warns (or errors due to CONFIG_WERROR):

  drivers/hwmon/oxp-sensors.c:481:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
  drivers/hwmon/oxp-sensors.c:553:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
  drivers/hwmon/oxp-sensors.c:556:2: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
  drivers/hwmon/oxp-sensors.c:607:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]

Clang is a little more pedantic than GCC, which does not warn when
falling through to a case that is just break or return. Clang's version
is more in line with the kernel's own stance in deprecated.rst, which
states that all switch/case blocks must end in either break,
fallthrough, continue, goto, or return. Add the missing breaks to
silence the warnings.

Fixes: b82b38a499 ("hwmon: (oxp-sensors) Add support for multiple new devices.")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Message-ID: <20240828-hwmon-oxp-sensors-fix-clang-implicit-fallthrough-v1-1-dc48496ac67a@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2024-08-28 13:33:53 -07:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Platform driver for OneXPlayer, AOKZOE, AYANEO, and OrangePi Handhelds
* that expose fan reading and control via hwmon sysfs.
*
* Old OXP boards have the same DMI strings and they are told apart by
* the boot cpu vendor (Intel/AMD). Of these older models only AMD is
* supported.
*
* Fan control is provided via pwm interface in the range [0-255].
* Old AMD boards use [0-100] as range in the EC, the written value is
* scaled to accommodate for that. Newer boards like the mini PRO and
* AOKZOE are not scaled but have the same EC layout. Newer models
* like the 2 and X1 are [0-184] and are scaled to 0-255. OrangePi
* are [1-244] and scaled to 0-255.
*
* Copyright (C) 2022 Joaquín I. Aramendía <samsagax@gmail.com>
* Copyright (C) 2024 Derek J. Clark <derekjohn.clark@gmail.com>
*/
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/hwmon.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/processor.h>
/* Handle ACPI lock mechanism */
static u32 oxp_mutex;
#define ACPI_LOCK_DELAY_MS 500
static bool lock_global_acpi_lock(void)
{
return ACPI_SUCCESS(acpi_acquire_global_lock(ACPI_LOCK_DELAY_MS, &oxp_mutex));
}
static bool unlock_global_acpi_lock(void)
{
return ACPI_SUCCESS(acpi_release_global_lock(oxp_mutex));
}
enum oxp_board {
aok_zoe_a1 = 1,
aya_neo_2,
aya_neo_air,
aya_neo_air_1s,
aya_neo_air_plus_mendo,
aya_neo_air_pro,
aya_neo_flip,
aya_neo_geek,
aya_neo_kun,
orange_pi_neo,
oxp_2,
oxp_fly,
oxp_mini_amd,
oxp_mini_amd_a07,
oxp_mini_amd_pro,
oxp_x1,
};
static enum oxp_board board;
/* Fan reading and PWM */
#define OXP_SENSOR_FAN_REG 0x76 /* Fan reading is 2 registers long */
#define OXP_2_SENSOR_FAN_REG 0x58 /* Fan reading is 2 registers long */
#define OXP_SENSOR_PWM_ENABLE_REG 0x4A /* PWM enable is 1 register long */
#define OXP_SENSOR_PWM_REG 0x4B /* PWM reading is 1 register long */
#define PWM_MODE_AUTO 0x00
#define PWM_MODE_MANUAL 0x01
/* OrangePi fan reading and PWM */
#define ORANGEPI_SENSOR_FAN_REG 0x78 /* Fan reading is 2 registers long */
#define ORANGEPI_SENSOR_PWM_ENABLE_REG 0x40 /* PWM enable is 1 register long */
#define ORANGEPI_SENSOR_PWM_REG 0x38 /* PWM reading is 1 register long */
/* Turbo button takeover function
* Different boards have different values and EC registers
* for the same function
*/
#define OXP_TURBO_SWITCH_REG 0xF1 /* Mini Pro, OneXFly, AOKZOE */
#define OXP_2_TURBO_SWITCH_REG 0xEB /* OXP2 and X1 */
#define OXP_MINI_TURBO_SWITCH_REG 0x1E /* Mini AO7 */
#define OXP_MINI_TURBO_TAKE_VAL 0x01 /* Mini AO7 */
#define OXP_TURBO_TAKE_VAL 0x40 /* All other models */
#define OXP_TURBO_RETURN_VAL 0x00 /* Common return val */
static const struct dmi_system_id dmi_table[] = {
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AOKZOE"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AOKZOE A1 AR07"),
},
.driver_data = (void *)aok_zoe_a1,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AOKZOE"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AOKZOE A1 Pro"),
},
.driver_data = (void *)aok_zoe_a1,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_MATCH(DMI_BOARD_NAME, "AYANEO 2"),
},
.driver_data = (void *)aya_neo_2,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AIR"),
},
.driver_data = (void *)aya_neo_air,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AIR 1S"),
},
.driver_data = (void *)aya_neo_air_1s,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AB05-Mendocino"),
},
.driver_data = (void *)aya_neo_air_plus_mendo,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AIR Pro"),
},
.driver_data = (void *)aya_neo_air_pro,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_MATCH(DMI_BOARD_NAME, "FLIP"),
},
.driver_data = (void *)aya_neo_flip,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_MATCH(DMI_BOARD_NAME, "GEEK"),
},
.driver_data = (void *)aya_neo_geek,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "KUN"),
},
.driver_data = (void *)aya_neo_kun,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "OrangePi"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "NEO-01"),
},
.driver_data = (void *)orange_pi_neo,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONE XPLAYER"),
},
.driver_data = (void *)oxp_mini_amd,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
DMI_MATCH(DMI_BOARD_NAME, "ONEXPLAYER 2"),
},
.driver_data = (void *)oxp_2,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONEXPLAYER F1"),
},
.driver_data = (void *)oxp_fly,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONEXPLAYER mini A07"),
},
.driver_data = (void *)oxp_mini_amd_a07,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONEXPLAYER Mini Pro"),
},
.driver_data = (void *)oxp_mini_amd_pro,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
DMI_MATCH(DMI_BOARD_NAME, "ONEXPLAYER X1"),
},
.driver_data = (void *)oxp_x1,
},
{},
};
/* Helper functions to handle EC read/write */
static int read_from_ec(u8 reg, int size, long *val)
{
int i;
int ret;
u8 buffer;
if (!lock_global_acpi_lock())
return -EBUSY;
*val = 0;
for (i = 0; i < size; i++) {
ret = ec_read(reg + i, &buffer);
if (ret)
return ret;
*val <<= i * 8;
*val += buffer;
}
if (!unlock_global_acpi_lock())
return -EBUSY;
return 0;
}
static int write_to_ec(u8 reg, u8 value)
{
int ret;
if (!lock_global_acpi_lock())
return -EBUSY;
ret = ec_write(reg, value);
if (!unlock_global_acpi_lock())
return -EBUSY;
return ret;
}
/* Turbo button toggle functions */
static int tt_toggle_enable(void)
{
u8 reg;
u8 val;
switch (board) {
case oxp_mini_amd_a07:
reg = OXP_MINI_TURBO_SWITCH_REG;
val = OXP_MINI_TURBO_TAKE_VAL;
break;
case aok_zoe_a1:
case oxp_fly:
case oxp_mini_amd_pro:
reg = OXP_TURBO_SWITCH_REG;
val = OXP_TURBO_TAKE_VAL;
break;
case oxp_2:
case oxp_x1:
reg = OXP_2_TURBO_SWITCH_REG;
val = OXP_TURBO_TAKE_VAL;
break;
default:
return -EINVAL;
}
return write_to_ec(reg, val);
}
static int tt_toggle_disable(void)
{
u8 reg;
u8 val;
switch (board) {
case oxp_mini_amd_a07:
reg = OXP_MINI_TURBO_SWITCH_REG;
val = OXP_TURBO_RETURN_VAL;
break;
case aok_zoe_a1:
case oxp_fly:
case oxp_mini_amd_pro:
reg = OXP_TURBO_SWITCH_REG;
val = OXP_TURBO_RETURN_VAL;
break;
case oxp_2:
case oxp_x1:
reg = OXP_2_TURBO_SWITCH_REG;
val = OXP_TURBO_RETURN_VAL;
break;
default:
return -EINVAL;
}
return write_to_ec(reg, val);
}
/* Callbacks for turbo toggle attribute */
static umode_t tt_toggle_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
switch (board) {
case aok_zoe_a1:
case oxp_2:
case oxp_fly:
case oxp_mini_amd_a07:
case oxp_mini_amd_pro:
case oxp_x1:
return attr->mode;
default:
break;
}
return 0;
}
static ssize_t tt_toggle_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
int rval;
bool value;
rval = kstrtobool(buf, &value);
if (rval)
return rval;
if (value) {
rval = tt_toggle_enable();
} else {
rval = tt_toggle_disable();
}
if (rval)
return rval;
return count;
}
static ssize_t tt_toggle_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int retval;
u8 reg;
long val;
switch (board) {
case oxp_mini_amd_a07:
reg = OXP_MINI_TURBO_SWITCH_REG;
break;
case aok_zoe_a1:
case oxp_fly:
case oxp_mini_amd_pro:
reg = OXP_TURBO_SWITCH_REG;
break;
case oxp_2:
case oxp_x1:
reg = OXP_2_TURBO_SWITCH_REG;
break;
default:
return -EINVAL;
}
retval = read_from_ec(reg, 1, &val);
if (retval)
return retval;
return sysfs_emit(buf, "%d\n", !!val);
}
static DEVICE_ATTR_RW(tt_toggle);
/* PWM enable/disable functions */
static int oxp_pwm_enable(void)
{
switch (board) {
case orange_pi_neo:
return write_to_ec(ORANGEPI_SENSOR_PWM_ENABLE_REG, PWM_MODE_MANUAL);
case aok_zoe_a1:
case aya_neo_2:
case aya_neo_air:
case aya_neo_air_plus_mendo:
case aya_neo_air_pro:
case aya_neo_flip:
case aya_neo_geek:
case aya_neo_kun:
case oxp_2:
case oxp_fly:
case oxp_mini_amd:
case oxp_mini_amd_a07:
case oxp_mini_amd_pro:
case oxp_x1:
return write_to_ec(OXP_SENSOR_PWM_ENABLE_REG, PWM_MODE_MANUAL);
default:
return -EINVAL;
}
}
static int oxp_pwm_disable(void)
{
switch (board) {
case orange_pi_neo:
return write_to_ec(ORANGEPI_SENSOR_PWM_ENABLE_REG, PWM_MODE_AUTO);
case aok_zoe_a1:
case aya_neo_2:
case aya_neo_air:
case aya_neo_air_1s:
case aya_neo_air_plus_mendo:
case aya_neo_air_pro:
case aya_neo_flip:
case aya_neo_geek:
case aya_neo_kun:
case oxp_2:
case oxp_fly:
case oxp_mini_amd:
case oxp_mini_amd_a07:
case oxp_mini_amd_pro:
case oxp_x1:
return write_to_ec(OXP_SENSOR_PWM_ENABLE_REG, PWM_MODE_AUTO);
default:
return -EINVAL;
}
}
/* Callbacks for hwmon interface */
static umode_t oxp_ec_hwmon_is_visible(const void *drvdata,
enum hwmon_sensor_types type, u32 attr, int channel)
{
switch (type) {
case hwmon_fan:
return 0444;
case hwmon_pwm:
return 0644;
default:
return 0;
}
}
static int oxp_platform_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
int ret;
switch (type) {
case hwmon_fan:
switch (attr) {
case hwmon_fan_input:
switch (board) {
case orange_pi_neo:
return read_from_ec(ORANGEPI_SENSOR_FAN_REG, 2, val);
case oxp_2:
case oxp_x1:
return read_from_ec(OXP_2_SENSOR_FAN_REG, 2, val);
case aok_zoe_a1:
case aya_neo_2:
case aya_neo_air:
case aya_neo_air_1s:
case aya_neo_air_plus_mendo:
case aya_neo_air_pro:
case aya_neo_flip:
case aya_neo_geek:
case aya_neo_kun:
case oxp_fly:
case oxp_mini_amd:
case oxp_mini_amd_a07:
case oxp_mini_amd_pro:
return read_from_ec(OXP_SENSOR_FAN_REG, 2, val);
default:
break;
}
break;
default:
break;
}
break;
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_input:
switch (board) {
case orange_pi_neo:
ret = read_from_ec(ORANGEPI_SENSOR_PWM_REG, 1, val);
if (ret)
return ret;
/* scale from range [1-244] */
*val = ((*val - 1) * 254 / 243) + 1;
break;
case oxp_2:
case oxp_x1:
ret = read_from_ec(OXP_SENSOR_PWM_REG, 1, val);
if (ret)
return ret;
/* scale from range [0-184] */
*val = (*val * 255) / 184;
break;
case aya_neo_2:
case aya_neo_air:
case aya_neo_air_1s:
case aya_neo_air_plus_mendo:
case aya_neo_air_pro:
case aya_neo_flip:
case aya_neo_geek:
case aya_neo_kun:
case oxp_mini_amd:
case oxp_mini_amd_a07:
ret = read_from_ec(OXP_SENSOR_PWM_REG, 1, val);
if (ret)
return ret;
/* scale from range [0-100] */
*val = (*val * 255) / 100;
break;
case aok_zoe_a1:
case oxp_fly:
case oxp_mini_amd_pro:
default:
ret = read_from_ec(OXP_SENSOR_PWM_REG, 1, val);
if (ret)
return ret;
break;
}
return 0;
case hwmon_pwm_enable:
switch (board) {
case orange_pi_neo:
return read_from_ec(ORANGEPI_SENSOR_PWM_ENABLE_REG, 1, val);
case aok_zoe_a1:
case aya_neo_2:
case aya_neo_air:
case aya_neo_air_1s:
case aya_neo_air_plus_mendo:
case aya_neo_air_pro:
case aya_neo_flip:
case aya_neo_geek:
case aya_neo_kun:
case oxp_2:
case oxp_fly:
case oxp_mini_amd:
case oxp_mini_amd_a07:
case oxp_mini_amd_pro:
case oxp_x1:
return read_from_ec(OXP_SENSOR_PWM_ENABLE_REG, 1, val);
default:
break;
}
break;
default:
break;
}
break;
default:
break;
}
return -EOPNOTSUPP;
}
static int oxp_platform_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
switch (type) {
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_enable:
if (val == 1)
return oxp_pwm_enable();
else if (val == 0)
return oxp_pwm_disable();
return -EINVAL;
case hwmon_pwm_input:
if (val < 0 || val > 255)
return -EINVAL;
switch (board) {
case orange_pi_neo:
/* scale to range [1-244] */
val = ((val - 1) * 243 / 254) + 1;
return write_to_ec(ORANGEPI_SENSOR_PWM_REG, val);
case oxp_2:
case oxp_x1:
/* scale to range [0-184] */
val = (val * 184) / 255;
return write_to_ec(OXP_SENSOR_PWM_REG, val);
case aya_neo_2:
case aya_neo_air:
case aya_neo_air_1s:
case aya_neo_air_plus_mendo:
case aya_neo_air_pro:
case aya_neo_flip:
case aya_neo_geek:
case aya_neo_kun:
case oxp_mini_amd:
case oxp_mini_amd_a07:
/* scale to range [0-100] */
val = (val * 100) / 255;
return write_to_ec(OXP_SENSOR_PWM_REG, val);
case aok_zoe_a1:
case oxp_fly:
case oxp_mini_amd_pro:
return write_to_ec(OXP_SENSOR_PWM_REG, val);
default:
break;
}
break;
default:
break;
}
break;
default:
break;
}
return -EOPNOTSUPP;
}
/* Known sensors in the OXP EC controllers */
static const struct hwmon_channel_info * const oxp_platform_sensors[] = {
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
NULL,
};
static struct attribute *oxp_ec_attrs[] = {
&dev_attr_tt_toggle.attr,
NULL
};
static struct attribute_group oxp_ec_attribute_group = {
.is_visible = tt_toggle_is_visible,
.attrs = oxp_ec_attrs,
};
static const struct attribute_group *oxp_ec_groups[] = {
&oxp_ec_attribute_group,
NULL
};
static const struct hwmon_ops oxp_ec_hwmon_ops = {
.is_visible = oxp_ec_hwmon_is_visible,
.read = oxp_platform_read,
.write = oxp_platform_write,
};
static const struct hwmon_chip_info oxp_ec_chip_info = {
.ops = &oxp_ec_hwmon_ops,
.info = oxp_platform_sensors,
};
/* Initialization logic */
static int oxp_platform_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device *hwdev;
hwdev = devm_hwmon_device_register_with_info(dev, "oxpec", NULL,
&oxp_ec_chip_info, NULL);
return PTR_ERR_OR_ZERO(hwdev);
}
static struct platform_driver oxp_platform_driver = {
.driver = {
.name = "oxp-platform",
.dev_groups = oxp_ec_groups,
},
.probe = oxp_platform_probe,
};
static struct platform_device *oxp_platform_device;
static int __init oxp_platform_init(void)
{
const struct dmi_system_id *dmi_entry;
dmi_entry = dmi_first_match(dmi_table);
if (!dmi_entry)
return -ENODEV;
board = (enum oxp_board)(unsigned long)dmi_entry->driver_data;
/*
* Have to check for AMD processor here because DMI strings are the same
* between Intel and AMD boards on older OneXPlayer devices, the only way
* to tell them apart is the CPU. Old Intel boards have an unsupported EC.
*/
if (board == oxp_mini_amd && boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
return -ENODEV;
oxp_platform_device =
platform_create_bundle(&oxp_platform_driver,
oxp_platform_probe, NULL, 0, NULL, 0);
return PTR_ERR_OR_ZERO(oxp_platform_device);
}
static void __exit oxp_platform_exit(void)
{
platform_device_unregister(oxp_platform_device);
platform_driver_unregister(&oxp_platform_driver);
}
MODULE_DEVICE_TABLE(dmi, dmi_table);
module_init(oxp_platform_init);
module_exit(oxp_platform_exit);
MODULE_AUTHOR("Joaquín Ignacio Aramendía <samsagax@gmail.com>");
MODULE_DESCRIPTION("Platform driver that handles EC sensors of OneXPlayer devices");
MODULE_LICENSE("GPL");
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