[v2,6/7] hwmon: Add Nuvoton NCT6694 HWMON support

Message ID	20241121064046.3724726-7-tmyu0@nuvoton.com
State	New
Headers	show Received: from mail-pf1-f178.google.com (mail-pf1-f178.google.com [209.85.210.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1485B1D042A; Thu, 21 Nov 2024 06:41:25 +0000 (UTC) From: Ming Yu <a0282524688@gmail.com> To: tmyu0@nuvoton.com, lee@kernel.org, linus.walleij@linaro.org, brgl@bgdev.pl, andi.shyti@kernel.org, mkl@pengutronix.de, mailhol.vincent@wanadoo.fr, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, wim@linux-watchdog.org, linux@roeck-us.net, jdelvare@suse.com, alexandre.belloni@bootlin.com Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-rtc@vger.kernel.org Subject: [PATCH v2 6/7] hwmon: Add Nuvoton NCT6694 HWMON support Date: Thu, 21 Nov 2024 14:40:45 +0800 Message-Id: <20241121064046.3724726-7-tmyu0@nuvoton.com> In-Reply-To: <20241121064046.3724726-1-tmyu0@nuvoton.com> References: <20241121064046.3724726-1-tmyu0@nuvoton.com> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	Add Nuvoton NCT6694 MFD drivers \| expand [v2,0/7] Add Nuvoton NCT6694 MFD drivers [v2,1/7] mfd: Add core driver for Nuvoton NCT6694 [v2,2/7] gpio: Add Nuvoton NCT6694 GPIO support [v2,3/7] i2c: Add Nuvoton NCT6694 I2C support [v2,4/7] can: Add Nuvoton NCT6694 CAN support [v2,5/7] watchdog: Add Nuvoton NCT6694 WDT support [v2,6/7] hwmon: Add Nuvoton NCT6694 HWMON support [v2,7/7] rtc: Add Nuvoton NCT6694 RTC support

diff --git a/MAINTAINERS b/MAINTAINERS index 496fe7d5a23f..d6414eea0463 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16546,6 +16546,7 @@ M: Ming Yu <tmyu0@nuvoton.com> L: linux-kernel@vger.kernel.org S: Supported F: drivers/gpio/gpio-nct6694.c +F: drivers/hwmon/nct6694-hwmon.c F: drivers/i2c/busses/i2c-nct6694.c F: drivers/mfd/nct6694.c F: drivers/net/can/nct6694_canfd.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index dd376602f3f1..df40986424bd 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1636,6 +1636,16 @@ config SENSORS_NCT6683 This driver can also be built as a module. If so, the module will be called nct6683. +config SENSORS_NCT6694 + tristate "Nuvoton NCT6694 Hardware Monitor support" + depends on MFD_NCT6694 + help + Say Y here to support Nuvoton NCT6694 hardware monitoring + functionality. + + This driver can also be built as a module. If so, the module + will be called nct6694-hwmon. + config SENSORS_NCT6775_CORE tristate select REGMAP diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index b827b92f2a78..27a43e67cdb7 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -168,6 +168,7 @@ obj-$(CONFIG_SENSORS_MLXREG_FAN) += mlxreg-fan.o obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o obj-$(CONFIG_SENSORS_MR75203) += mr75203.o obj-$(CONFIG_SENSORS_NCT6683) += nct6683.o +obj-$(CONFIG_SENSORS_NCT6694) += nct6694-hwmon.o obj-$(CONFIG_SENSORS_NCT6775_CORE) += nct6775-core.o nct6775-objs := nct6775-platform.o obj-$(CONFIG_SENSORS_NCT6775) += nct6775.o diff --git a/drivers/hwmon/nct6694-hwmon.c b/drivers/hwmon/nct6694-hwmon.c new file mode 100644 index 000000000000..f24cc22b8b42 --- /dev/null +++ b/drivers/hwmon/nct6694-hwmon.c @@ -0,0 +1,771 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 HWMON driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include <linux/hwmon.h> +#include <linux/kernel.h> +#include <linux/mfd/core.h> +#include <linux/mfd/nct6694.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +/* Host interface */ +#define NCT6694_RPT_MOD 0xFF +#define NCT6694_HWMON_MOD 0x00 +#define NCT6694_PWM_MOD 0x01 + +/* Report Channel */ +#define NCT6694_VIN_IDX(x) (0x00 + (x)) +#define NCT6694_TIN_IDX(x) \ + ({ typeof(x) (_x) = (x); \ + ((_x) < 10) ? (0x10 + ((_x) * 2)) : \ + (0x30 + (((_x) - 10) * 2)); }) +#define NCT6694_FIN_IDX(x) (0x50 + ((x) * 2)) +#define NCT6694_PWM_IDX(x) (0x70 + (x)) +#define NCT6694_VIN_STS(x) (0x68 + (x)) +#define NCT6694_TIN_STS(x) (0x6A + (x)) +#define NCT6694_FIN_STS(x) (0x6E + (x)) + +/* Message Channel*/ +/* HWMON Command */ +/* Command 00h */ +#define NCT6694_HWMON_CMD0_LEN 0x40 +#define NCT6694_HWMON_CMD0_OFFSET 0x0000 /* OFFSET = SEL|CMD */ +#define NCT6694_VIN_EN(x) (0x00 + (x)) +#define NCT6694_TIN_EN(x) (0x02 + (x)) +#define NCT6694_FIN_EN(x) (0x04 + (x)) +#define NCT6694_PWM_EN(x) (0x06 + (x)) +#define NCT6694_PWM_FREQ_IDX(x) (0x30 + (x)) +/* Command 02h */ +#define NCT6694_HWMON_CMD2_LEN 0x90 +#define NCT6694_HWMON_CMD2_OFFSET 0x0002 /* OFFSET = SEL|CMD */ +#define NCT6694_SMI_CTRL_IDX 0x00 +#define NCT6694_VIN_HL(x) (0x10 + ((x) * 2)) +#define NCT6694_VIN_LL(x) (0x11 + ((x) * 2)) +#define NCT6694_TIN_HYST(x) (0x30 + ((x) * 2)) +#define NCT6694_TIN_HL(x) (0x31 + ((x) * 2)) +#define NCT6694_FIN_HL(x) (0x70 + ((x) * 2)) +#define NCT6694_FIN_LL(x) (0x71 + ((x) * 2)) +/* PWM Command */ +#define NCT6694_PWM_CMD1_LEN 0x18 +#define NCT6694_PWM_CMD1_OFFSET 0x0001 +#define NCT6694_MAL_VAL(x) (0x02 + (x)) + +#define NCT6694_FREQ_FROM_REG(reg) ((reg) * 25000 / 255) +#define NCT6694_FREQ_TO_REG(val) \ + (DIV_ROUND_CLOSEST(clamp_val((val), 100, 25000) * 255, 25000)) + +#define NCT6694_LSB_REG_MASK GENMASK(7, 5) +#define NCT6694_TIN_HYST_MASK GENMASK(7, 5) + +static inline long in_from_reg(u8 reg) +{ + return reg * 16; +} + +static inline u8 in_to_reg(long val) +{ + if (val <= 0) + return 0; + return val / 16; +} + +static inline long temp_from_reg(u8 reg) +{ + return reg * 1000; +} + +static inline u8 temp_to_reg(long val) +{ + return val / 1000; +} + +struct nct6694_hwmon_data { + struct nct6694 *nct6694; + struct mutex lock; + unsigned char *xmit_buf; + unsigned char hwmon_en[NCT6694_HWMON_CMD0_LEN]; +}; + +#define NCT6694_HWMON_IN_CONFIG (HWMON_I_INPUT | HWMON_I_ENABLE | \ + HWMON_I_MAX | HWMON_I_MIN | \ + HWMON_I_ALARM) +#define NCT6694_HWMON_TEMP_CONFIG (HWMON_T_INPUT | HWMON_T_ENABLE | \ + HWMON_T_MAX | HWMON_T_MAX_HYST | \ + HWMON_T_MAX_ALARM) +#define NCT6694_HWMON_FAN_CONFIG (HWMON_F_INPUT | HWMON_F_ENABLE | \ + HWMON_F_MIN | HWMON_F_MIN_ALARM) +#define NCT6694_HWMON_PWM_CONFIG (HWMON_PWM_INPUT | HWMON_PWM_ENABLE | \ + HWMON_PWM_FREQ) +static const struct hwmon_channel_info *nct6694_info[] = { + HWMON_CHANNEL_INFO(in, + NCT6694_HWMON_IN_CONFIG, /* VIN0 */ + NCT6694_HWMON_IN_CONFIG, /* VIN1 */ + NCT6694_HWMON_IN_CONFIG, /* VIN2 */ + NCT6694_HWMON_IN_CONFIG, /* VIN3 */ + NCT6694_HWMON_IN_CONFIG, /* VIN5 */ + NCT6694_HWMON_IN_CONFIG, /* VIN6 */ + NCT6694_HWMON_IN_CONFIG, /* VIN7 */ + NCT6694_HWMON_IN_CONFIG, /* VIN14 */ + NCT6694_HWMON_IN_CONFIG, /* VIN15 */ + NCT6694_HWMON_IN_CONFIG, /* VIN16 */ + NCT6694_HWMON_IN_CONFIG, /* VBAT */ + NCT6694_HWMON_IN_CONFIG, /* VSB */ + NCT6694_HWMON_IN_CONFIG, /* AVSB */ + NCT6694_HWMON_IN_CONFIG, /* VCC */ + NCT6694_HWMON_IN_CONFIG, /* VHIF */ + NCT6694_HWMON_IN_CONFIG), /* VTT */ + + HWMON_CHANNEL_INFO(temp, + NCT6694_HWMON_TEMP_CONFIG, /* THR1 */ + NCT6694_HWMON_TEMP_CONFIG, /* THR2 */ + NCT6694_HWMON_TEMP_CONFIG, /* THR14 */ + NCT6694_HWMON_TEMP_CONFIG, /* THR15 */ + NCT6694_HWMON_TEMP_CONFIG, /* THR16 */ + NCT6694_HWMON_TEMP_CONFIG, /* TDP0 */ + NCT6694_HWMON_TEMP_CONFIG, /* TDP1 */ + NCT6694_HWMON_TEMP_CONFIG, /* TDP2 */ + NCT6694_HWMON_TEMP_CONFIG, /* TDP3 */ + NCT6694_HWMON_TEMP_CONFIG, /* TDP4 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN0 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN1 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN2 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN3 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN4 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN5 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN6 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN7 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN8 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN9 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN10 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN11 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN12 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN13 */ + NCT6694_HWMON_TEMP_CONFIG, /* DTIN14 */ + NCT6694_HWMON_TEMP_CONFIG), /* DTIN15 */ + + HWMON_CHANNEL_INFO(fan, + NCT6694_HWMON_FAN_CONFIG, /* FIN0 */ + NCT6694_HWMON_FAN_CONFIG, /* FIN1 */ + NCT6694_HWMON_FAN_CONFIG, /* FIN2 */ + NCT6694_HWMON_FAN_CONFIG, /* FIN3 */ + NCT6694_HWMON_FAN_CONFIG, /* FIN4 */ + NCT6694_HWMON_FAN_CONFIG, /* FIN5 */ + NCT6694_HWMON_FAN_CONFIG, /* FIN6 */ + NCT6694_HWMON_FAN_CONFIG, /* FIN7 */ + NCT6694_HWMON_FAN_CONFIG, /* FIN8 */ + NCT6694_HWMON_FAN_CONFIG), /* FIN9 */ + + HWMON_CHANNEL_INFO(pwm, + NCT6694_HWMON_PWM_CONFIG, /* PWM0 */ + NCT6694_HWMON_PWM_CONFIG, /* PWM1 */ + NCT6694_HWMON_PWM_CONFIG, /* PWM2 */ + NCT6694_HWMON_PWM_CONFIG, /* PWM3 */ + NCT6694_HWMON_PWM_CONFIG, /* PWM4 */ + NCT6694_HWMON_PWM_CONFIG, /* PWM5 */ + NCT6694_HWMON_PWM_CONFIG, /* PWM6 */ + NCT6694_HWMON_PWM_CONFIG, /* PWM7 */ + NCT6694_HWMON_PWM_CONFIG, /* PWM8 */ + NCT6694_HWMON_PWM_CONFIG), /* PWM9 */ + NULL +}; + +static int nct6694_in_read(struct device *dev, u32 attr, int channel, + long *val) +{ + struct nct6694_hwmon_data *data = dev_get_drvdata(dev); + unsigned char vin_en; + int ret; + + guard(mutex)(&data->lock); + + switch (attr) { + case hwmon_in_enable: + vin_en = data->hwmon_en[NCT6694_VIN_EN(channel / 8)]; + *val = vin_en & BIT(channel % 8) ? 1 : 0; + + return 0; + case hwmon_in_input: + ret = nct6694_read_msg(data->nct6694, NCT6694_RPT_MOD, + NCT6694_VIN_IDX(channel), 1, + data->xmit_buf); + if (ret) + return ret; + + *val = in_from_reg(data->xmit_buf[0]); + + return 0; + case hwmon_in_max: + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + *val = in_from_reg(data->xmit_buf[NCT6694_VIN_HL(channel)]); + + return 0; + case hwmon_in_min: + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + *val = in_from_reg(data->xmit_buf[NCT6694_VIN_LL(channel)]); + + return 0; + case hwmon_in_alarm: + ret = nct6694_read_msg(data->nct6694, NCT6694_RPT_MOD, + NCT6694_VIN_STS(channel / 8), 1, + data->xmit_buf); + if (ret) + return ret; + + *val = !!(data->xmit_buf[0] & BIT(channel % 8)); + + return 0; + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_temp_read(struct device *dev, u32 attr, int channel, + long *val) +{ + struct nct6694_hwmon_data *data = dev_get_drvdata(dev); + unsigned char temp_en, temp_hyst; + int ret, int_part, frac_part; + signed char temp_max; + + guard(mutex)(&data->lock); + + switch (attr) { + case hwmon_temp_enable: + temp_en = data->hwmon_en[NCT6694_TIN_EN(channel / 8)]; + *val = temp_en & BIT(channel % 8) ? 1 : 0; + + return 0; + case hwmon_temp_input: + ret = nct6694_read_msg(data->nct6694, NCT6694_RPT_MOD, + NCT6694_TIN_IDX(channel), 2, + data->xmit_buf); + if (ret) + return ret; + + int_part = sign_extend32(data->xmit_buf[0], 7); + frac_part = FIELD_GET(NCT6694_LSB_REG_MASK, data->xmit_buf[1]); + if (int_part < 0) + *val = (int_part + 1) * 1000 - (8 - frac_part) * 125; + else + *val = int_part * 1000 + frac_part * 125; + + return 0; + case hwmon_temp_max: + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + *val = temp_from_reg(data->xmit_buf[NCT6694_TIN_HL(channel)]); + + return 0; + case hwmon_temp_max_hyst: + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + temp_max = (signed char)data->xmit_buf[NCT6694_TIN_HL(channel)]; + temp_hyst = FIELD_GET(NCT6694_TIN_HYST_MASK, + data->xmit_buf[NCT6694_TIN_HYST(channel)]); + if (temp_max < 0) + *val = temp_from_reg(temp_max + temp_hyst); + else + *val = temp_from_reg(temp_max - temp_hyst); + + return 0; + case hwmon_temp_max_alarm: + ret = nct6694_read_msg(data->nct6694, NCT6694_RPT_MOD, + NCT6694_TIN_STS(channel / 8), 1, + data->xmit_buf); + if (ret) + return ret; + + *val = !!(data->xmit_buf[0] & BIT(channel % 8)); + + return 0; + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_fan_read(struct device *dev, u32 attr, int channel, + long *val) +{ + struct nct6694_hwmon_data *data = dev_get_drvdata(dev); + unsigned char fanin_en; + int ret; + + guard(mutex)(&data->lock); + + switch (attr) { + case hwmon_fan_enable: + fanin_en = data->hwmon_en[NCT6694_FIN_EN(channel / 8)]; + *val = fanin_en & BIT(channel % 8) ? 1 : 0; + + return 0; + case hwmon_fan_input: + ret = nct6694_read_msg(data->nct6694, NCT6694_RPT_MOD, + NCT6694_FIN_IDX(channel), 2, + data->xmit_buf); + if (ret) + return ret; + + *val = (data->xmit_buf[1] | + (data->xmit_buf[0] << 8)) & 0xFFFF; + + return 0; + case hwmon_fan_min: + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + *val = (data->xmit_buf[NCT6694_FIN_LL(channel)] | + data->xmit_buf[NCT6694_FIN_HL(channel)] << 8) & 0xFFFF; + + return 0; + case hwmon_fan_min_alarm: + ret = nct6694_read_msg(data->nct6694, NCT6694_RPT_MOD, + NCT6694_FIN_STS(channel / 8), + 1, data->xmit_buf); + if (ret) + return ret; + + *val = data->xmit_buf[0] & BIT(channel % 8); + + return 0; + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_pwm_read(struct device *dev, u32 attr, int channel, + long *val) +{ + struct nct6694_hwmon_data *data = dev_get_drvdata(dev); + unsigned char pwm_en; + int ret; + + guard(mutex)(&data->lock); + + switch (attr) { + case hwmon_pwm_enable: + pwm_en = data->hwmon_en[NCT6694_PWM_EN(channel / 8)]; + *val = pwm_en & BIT(channel % 8) ? 1 : 0; + + return 0; + case hwmon_pwm_input: + ret = nct6694_read_msg(data->nct6694, NCT6694_RPT_MOD, + NCT6694_PWM_IDX(channel), + 1, data->xmit_buf); + if (ret) + return ret; + + *val = data->xmit_buf[0]; + + return 0; + case hwmon_pwm_freq: + *val = NCT6694_FREQ_FROM_REG(data->hwmon_en[NCT6694_PWM_FREQ_IDX(channel)]); + + return 0; + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_enable_channel(struct device *dev, u8 reg, + int channel, long val) +{ + struct nct6694_hwmon_data *data = dev_get_drvdata(dev); + + if (val == 0) + data->hwmon_en[reg] &= ~BIT(channel % 8); + else if (val == 1) + data->hwmon_en[reg] |= BIT(channel % 8); + else + return -EINVAL; + + return nct6694_write_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD0_OFFSET, + NCT6694_HWMON_CMD0_LEN, + data->hwmon_en); +} + +static int nct6694_in_write(struct device *dev, u32 attr, int channel, + long val) +{ + struct nct6694_hwmon_data *data = dev_get_drvdata(dev); + int ret; + + guard(mutex)(&data->lock); + + switch (attr) { + case hwmon_in_enable: + return nct6694_enable_channel(dev, NCT6694_VIN_EN(channel / 8), + channel, val); + case hwmon_in_max: + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + val = clamp_val(val, 0, 2032); + data->xmit_buf[NCT6694_VIN_HL(channel)] = in_to_reg(val); + + return nct6694_write_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + case hwmon_in_min: + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + val = clamp_val(val, 0, 2032); + data->xmit_buf[NCT6694_VIN_LL(channel)] = in_to_reg(val); + + return nct6694_write_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_temp_write(struct device *dev, u32 attr, int channel, + long val) +{ + struct nct6694_hwmon_data *data = dev_get_drvdata(dev); + signed char temp_max, temp_hyst; + int ret; + + guard(mutex)(&data->lock); + + switch (attr) { + case hwmon_temp_enable: + return nct6694_enable_channel(dev, NCT6694_TIN_EN(channel / 8), + channel, val); + case hwmon_temp_max: + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + val = clamp_val(val, -127000, 127000); + data->xmit_buf[NCT6694_TIN_HL(channel)] = temp_to_reg(val); + + return nct6694_write_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + case hwmon_temp_max_hyst: + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + + val = clamp_val(val, -127000, 127000); + temp_max = (signed char)data->xmit_buf[NCT6694_TIN_HL(channel)]; + temp_hyst = (temp_max < 0) ? (temp_max + val / 1000) : + (temp_max - val / 1000); + if (temp_hyst < 0 || temp_hyst > 7) + return -EINVAL; + + data->xmit_buf[NCT6694_TIN_HYST(channel)] = + (data->xmit_buf[NCT6694_TIN_HYST(channel)] & ~NCT6694_TIN_HYST_MASK) | + FIELD_PREP(NCT6694_TIN_HYST_MASK, temp_hyst); + + return nct6694_write_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_fan_write(struct device *dev, u32 attr, int channel, + long val) +{ + struct nct6694_hwmon_data *data = dev_get_drvdata(dev); + int ret; + + guard(mutex)(&data->lock); + + switch (attr) { + case hwmon_fan_enable: + return nct6694_enable_channel(dev, NCT6694_FIN_EN(channel / 8), + channel, val); + case hwmon_fan_min: + if (val <= 0) + return -EINVAL; + + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + val = clamp_val(val, 1, 65535); + data->xmit_buf[NCT6694_FIN_HL(channel)] = (u8)((val >> 8) & 0xFF); + data->xmit_buf[NCT6694_FIN_LL(channel)] = (u8)(val & 0xFF); + + return nct6694_write_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_pwm_write(struct device *dev, u32 attr, int channel, + long val) +{ + struct nct6694_hwmon_data *data = dev_get_drvdata(dev); + int ret; + + guard(mutex)(&data->lock); + + switch (attr) { + case hwmon_pwm_enable: + return nct6694_enable_channel(dev, NCT6694_PWM_EN(channel / 8), + channel, val); + case hwmon_pwm_input: + if (val < 0 || val > 255) + return -EINVAL; + + ret = nct6694_read_msg(data->nct6694, NCT6694_PWM_MOD, + NCT6694_PWM_CMD1_OFFSET, + NCT6694_PWM_CMD1_LEN, + data->xmit_buf); + if (ret) + return ret; + + data->xmit_buf[NCT6694_MAL_VAL(channel)] = val; + + return nct6694_write_msg(data->nct6694, NCT6694_PWM_MOD, + NCT6694_PWM_CMD1_OFFSET, + NCT6694_PWM_CMD1_LEN, + data->xmit_buf); + case hwmon_pwm_freq: + data->hwmon_en[NCT6694_PWM_FREQ_IDX(channel)] = NCT6694_FREQ_TO_REG(val); + + return nct6694_write_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD0_OFFSET, + NCT6694_HWMON_CMD0_LEN, + data->hwmon_en); + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + switch (type) { + case hwmon_in: /* in mV */ + return nct6694_in_read(dev, attr, channel, val); + case hwmon_temp:/* in mC */ + return nct6694_temp_read(dev, attr, channel, val); + case hwmon_fan: /* in RPM */ + return nct6694_fan_read(dev, attr, channel, val); + case hwmon_pwm: /* in value 0~255 */ + return nct6694_pwm_read(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + switch (type) { + case hwmon_in: + return nct6694_in_write(dev, attr, channel, val); + case hwmon_temp: + return nct6694_temp_write(dev, attr, channel, val); + case hwmon_fan: + return nct6694_fan_write(dev, attr, channel, val); + case hwmon_pwm: + return nct6694_pwm_write(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static umode_t nct6694_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_in: + switch (attr) { + case hwmon_in_enable: + case hwmon_in_max: + case hwmon_in_min: + return 0644; + case hwmon_in_alarm: + case hwmon_in_input: + return 0444; + default: + return 0; + } + case hwmon_temp: + switch (attr) { + case hwmon_temp_enable: + case hwmon_temp_max: + case hwmon_temp_max_hyst: + return 0644; + case hwmon_temp_input: + case hwmon_temp_max_alarm: + return 0444; + default: + return 0; + } + case hwmon_fan: + switch (attr) { + case hwmon_fan_enable: + case hwmon_fan_min: + return 0644; + case hwmon_fan_input: + case hwmon_fan_min_alarm: + return 0444; + default: + return 0; + } + case hwmon_pwm: + switch (attr) { + case hwmon_pwm_enable: + case hwmon_pwm_freq: + case hwmon_pwm_input: + return 0644; + default: + return 0; + } + default: + return 0; + } +} + +static const struct hwmon_ops nct6694_hwmon_ops = { + .is_visible = nct6694_is_visible, + .read = nct6694_read, + .write = nct6694_write, +}; + +static const struct hwmon_chip_info nct6694_chip_info = { + .ops = &nct6694_hwmon_ops, + .info = nct6694_info, +}; + +static int nct6694_hwmon_init(struct nct6694_hwmon_data *data) +{ + int ret; + + guard(mutex)(&data->lock); + + /* + * Record each Hardware Monitor Channel enable status + * and PWM frequency register + */ + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD0_OFFSET, + NCT6694_HWMON_CMD0_LEN, + data->hwmon_en); + if (ret) + return ret; + + /* Set Fan input Real Time alarm mode */ + ret = nct6694_read_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); + if (ret) + return ret; + + data->xmit_buf[NCT6694_SMI_CTRL_IDX] = 0x02; + + return nct6694_write_msg(data->nct6694, NCT6694_HWMON_MOD, + NCT6694_HWMON_CMD2_OFFSET, + NCT6694_HWMON_CMD2_LEN, + data->xmit_buf); +} + +static int nct6694_hwmon_probe(struct platform_device *pdev) +{ + struct nct6694_hwmon_data *data; + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent); + struct device *hwmon_dev; + int ret; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->xmit_buf = devm_kcalloc(&pdev->dev, NCT6694_MAX_PACKET_SZ, + sizeof(unsigned char), GFP_KERNEL); + if (!data->xmit_buf) + return -ENOMEM; + + data->nct6694 = nct6694; + mutex_init(&data->lock); + platform_set_drvdata(pdev, data); + + ret = nct6694_hwmon_init(data); + if (ret) + return ret; + + /* Register hwmon device to HWMON framework */ + hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, + "nct6694", data, + &nct6694_chip_info, + NULL); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static struct platform_driver nct6694_hwmon_driver = { + .driver = { + .name = "nct6694-hwmon", + }, + .probe = nct6694_hwmon_probe, +}; + +module_platform_driver(nct6694_hwmon_driver); + +MODULE_DESCRIPTION("USB-HWMON driver for NCT6694"); +MODULE_AUTHOR("Ming Yu <tmyu0@nuvoton.com>"); +MODULE_LICENSE("GPL");

[v2,6/7] hwmon: Add Nuvoton NCT6694 HWMON support

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