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X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?YWxqYlFGMS9IUDZWVU5zL0F0QU1BbG5hN2JpbUZVdTd2STBGSG9HN2xvaGts?= =?utf-8?B?MWJZYSsxRFBiZHBXRGNJNExyTzZFRkJ4WFdmU1QwQkZiUGp0NGFEeVQ4Q1Ni?= =?utf-8?B?d0dOS210RHFZYjIyS1JmcFhyd3cxMW5yL3cySk56emVheDlzc25KRHZnYTVE?= =?utf-8?B?YmxmOWpVU3ZqZHE2RTJ4R0EyN2Y2TGtyeVlabVBHbWZ6N1dKNWlqMzlnV3hw?= =?utf-8?B?NElRejJQSHFLVmpVYm5LdGpNalpyR0Y4eEVWR1Vod3FrUVI4Qm8vRi9qYzB3?= =?utf-8?B?MmptdEl3OS94TmlLQ2NKQjFITFBnRnFLQm5wei93Z3dMZEcrRXl0VlZIRHlT?= =?utf-8?B?RUhhd0RBT0x3aEY3cTdkdmpHem5VV1JwRlVNVjUzUnhuYm9hQ2YyN3kwK0xJ?= =?utf-8?B?UXJoVjg1MUVxd3Q4eTZ2ZkJ2YkREclJ3b0hXQnZFajI1dklmQ0g1eHlyYmdR?= =?utf-8?B?VSt1dXVVN3pHbG5ocEo1K2U1NmJxR2lVeHZHN09mYTF3K1dXNnRyS28vLzdp?= =?utf-8?B?ZThqeXRUdTBUeUZ5OG1Ra1oxMlNUVFhmTHhsNlZMczJrSHZzRDRvcUhkUS8y?= =?utf-8?B?S25oVWYwUmRvbjdHNzhyUEhxRDRYTlJUOHdGZlQvUnZPTGF4NnhRa1p2b2dR?= =?utf-8?B?Ymk2ZXVQN3JBbGNQTE9pU3JEV0VkUkZzelhjcVRYZi8xOVJtQy96MFBUUTQy?= =?utf-8?B?NjdRVVdvdUMrdjhDMFhpWldGSjhzdUdoQXprZG1yVlp3N2t1ZGFENlArcUtp?= =?utf-8?B?S2pnYlZTbWdPUGwyRHRieUMyejNMOTlNREJNSU93MkhSV2pLbGhpbGRMKzdN?= =?utf-8?B?NWZVUUlZZzZ1aTdwMnBaMjF3Z215Qko1dC96ODBYdS94OWQxRFZpUGFCUFpa?= =?utf-8?B?RWRlSDVrWWxGcFpSQi92bVBla2RoL0xST253ajU4RnFmS01Yem9CVmVma1M3?= =?utf-8?B?UnFuTzlsb2FwbDdiMmxTdU9BVE9jMUlDTXkzbm5QRWpXLzVSYkhxWXFjUWlY?= =?utf-8?B?WkRoWlFpbVJjVUdkUk1BQm9xby9iVTNYbkJ3aHNDVUw5dW1rWHdUNCtHUTk4?= =?utf-8?B?ZllwRGRUelV3dGFpRGpQWnp4Y1lDamNhMkdRYTJoRmZiRmhNSEIwWmQ5RXkr?= =?utf-8?B?YTNqMGplTlowc2UyVUNiMGxaMmt1Y3NoTTJ6My92QmNZaWxPb0ltL3dYRXdL?= =?utf-8?B?UFNQTDFMeWFOZHlRVVhUd1hhS1N1bkRWa3NlOHo4dnA2RkRDeWgrTjBaQ0JS?= =?utf-8?B?ankvbEdpdTBiMThKdys2cTk0K1o2QUxSK2hDN1dEUzBweGUyaTFQVExtQkRG?= =?utf-8?B?MDQzRjNLak5ta2hYSWFaZlRENDNHdnZzY1RESGRXSnJ3TUhzbDlHQWtxUVZa?= =?utf-8?B?SWVZdUFQRlp3RGp3cmdKNGdvNGdsK1RrQXlaSjRWYitJd1RacXpobzNUNzNl?= =?utf-8?B?S3lwdDVadUZneG1kSFp6SnJqbnY0bHErdi9wbzRPR21UNEVnTnN6RHhvSVZt?= =?utf-8?B?elcrMW0vS2s4RGVlTHIxenNTdllKbU85cHo1RTRoYkRHYjdURjBzUXpUNDhm?= =?utf-8?B?L2xQYWQ3Q3Y0aHQ3cVBSUjhkdlZ1czhoaWNDNmlPTHl0cXV2RjJ1cGc4WUhv?= =?utf-8?B?SlNGbld6M2xacDV3N0w0ZlNldml5MUlsSEttRm1WZSs4NTk4TjhzUndiczZ2?= =?utf-8?B?ZWpseGFSVlErMFJJWFZvdWJWZmJVOHRFeWlJSEtjRmsrQVRYMnY4SG1DTEw4?= =?utf-8?Q?W13POMULu1ZSYFhLr9j8tBiQzkBVE2YeiUw1orh?= X-OriginatorOrg: os.amperecomputing.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7ac248b1-8fde-420f-a67a-08d8f998a1ac X-MS-Exchange-CrossTenant-AuthSource: MW2PR0102MB3482.prod.exchangelabs.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Apr 2021 07:42:01.9614 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3bc2b170-fd94-476d-b0ce-4229bdc904a7 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ASMLK9nFsve5BDHvUcAgT58YZ3WcaZucl9bZRKWe/Imtrdsd6+JY+Z40apd2NV/kvWUVqWjSdhcm3mApLIsqTx6dSR7IA4uQHQsDdWssXCk= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR01MB6466 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org On 30/03/2021 08:43, Guenter Roeck wrote: > On 3/28/21 6:52 PM, Quan Nguyen wrote: >> This commit adds support for Ampere SMpro hwmon driver. This driver >> supports accessing various CPU sensors provided by the SMpro co-processor >> including temperature, power, voltages, and current. >> >> Signed-off-by: Quan Nguyen >> --- >> drivers/hwmon/Kconfig | 8 + >> drivers/hwmon/Makefile | 1 + >> drivers/hwmon/smpro-hwmon.c | 494 ++++++++++++++++++++++++++++++++++++ >> 3 files changed, 503 insertions(+) >> create mode 100644 drivers/hwmon/smpro-hwmon.c >> >> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig >> index 0ddc974b102e..ba4b5a911baf 100644 >> --- a/drivers/hwmon/Kconfig >> +++ b/drivers/hwmon/Kconfig >> @@ -67,6 +67,14 @@ config SENSORS_ABITUGURU3 >> This driver can also be built as a module. If so, the module >> will be called abituguru3. >> >> +config SENSORS_SMPRO >> + tristate "Ampere's Altra SMpro hardware monitoring driver" >> + depends on MFD_SMPRO >> + help >> + If you say yes here you get support for the thermal, voltage, >> + current and power sensors of Ampere's Altra processor family SoC >> + with SMpro co-processor. >> + >> config SENSORS_AD7314 >> tristate "Analog Devices AD7314 and compatibles" >> depends on SPI >> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile >> index 59e78bc212cf..b25391f9c651 100644 >> --- a/drivers/hwmon/Makefile >> +++ b/drivers/hwmon/Makefile >> @@ -174,6 +174,7 @@ obj-$(CONFIG_SENSORS_SHT3x) += sht3x.o >> obj-$(CONFIG_SENSORS_SHTC1) += shtc1.o >> obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o >> obj-$(CONFIG_SENSORS_SMM665) += smm665.o >> +obj-$(CONFIG_SENSORS_SMPRO) += smpro-hwmon.o >> obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o >> obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o >> obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o >> diff --git a/drivers/hwmon/smpro-hwmon.c b/drivers/hwmon/smpro-hwmon.c >> new file mode 100644 >> index 000000000000..4277736ebc6e >> --- /dev/null >> +++ b/drivers/hwmon/smpro-hwmon.c >> @@ -0,0 +1,494 @@ >> +// SPDX-License-Identifier: GPL-2.0+ >> +/* >> + * Ampere Computing SoC's SMPro Hardware Monitoring Driver >> + * >> + * Copyright (c) 2021, Ampere Computing LLC >> + */ >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> + >> +/* Identification Registers */ >> +#define MANUFACTURER_ID_REG 0x02 >> +#define AMPERE_MANUFACTURER_ID 0xCD3A >> + >> +/* Logical Power Sensor Registers */ >> +#define SOC_TEMP_REG 0x10 >> +#define SOC_VRD_TEMP_REG 0x11 >> +#define DIMM_VRD_TEMP_REG 0x12 >> +#define CORE_VRD_TEMP_REG 0x13 >> +#define CH0_DIMM_TEMP_REG 0x14 >> +#define CH1_DIMM_TEMP_REG 0x15 >> +#define CH2_DIMM_TEMP_REG 0x16 >> +#define CH3_DIMM_TEMP_REG 0x17 >> +#define CH4_DIMM_TEMP_REG 0x18 >> +#define CH5_DIMM_TEMP_REG 0x19 >> +#define CH6_DIMM_TEMP_REG 0x1A >> +#define CH7_DIMM_TEMP_REG 0x1B >> +#define RCA_VRD_TEMP_REG 0x1C >> + >> +#define CORE_VRD_PWR_REG 0x20 >> +#define SOC_PWR_REG 0x21 >> +#define DIMM_VRD1_PWR_REG 0x22 >> +#define DIMM_VRD2_PWR_REG 0x23 >> +#define CORE_VRD_PWR_MW_REG 0x26 >> +#define SOC_PWR_MW_REG 0x27 >> +#define DIMM_VRD1_PWR_MW_REG 0x28 >> +#define DIMM_VRD2_PWR_MW_REG 0x29 >> +#define RCA_VRD_PWR_REG 0x2A >> +#define RCA_VRD_PWR_MW_REG 0x2B >> + >> +#define MEM_HOT_THRESHOLD_REG 0x32 >> +#define SOC_VR_HOT_THRESHOLD_REG 0x33 >> +#define CORE_VRD_VOLT_REG 0x34 >> +#define SOC_VRD_VOLT_REG 0x35 >> +#define DIMM_VRD1_VOLT_REG 0x36 >> +#define DIMM_VRD2_VOLT_REG 0x37 >> +#define RCA_VRD_VOLT_REG 0x38 >> + >> +#define CORE_VRD_CURR_REG 0x39 >> +#define SOC_VRD_CURR_REG 0x3A >> +#define DIMM_VRD1_CURR_REG 0x3B >> +#define DIMM_VRD2_CURR_REG 0x3C >> +#define RCA_VRD_CURR_REG 0x3D >> + >> +struct smpro_hwmon { >> + struct regmap *regmap; >> +}; >> + >> +struct smpro_sensor { >> + const u8 reg; >> + const u8 reg_ext; >> + const char *label; >> +}; >> + >> +static const struct smpro_sensor temperature[] = { >> + { >> + .reg = SOC_TEMP_REG, >> + .label = "temp1 SoC" >> + }, >> + { >> + .reg = SOC_VRD_TEMP_REG, >> + .label = "temp2 SoC VRD" >> + }, >> + { >> + .reg = DIMM_VRD_TEMP_REG, >> + .label = "temp3 DIMM VRD" >> + }, >> + { >> + .reg = CORE_VRD_TEMP_REG, >> + .label = "temp4 CORE VRD" >> + }, >> + { >> + .reg = CH0_DIMM_TEMP_REG, >> + .label = "temp5 CH0 DIMM" >> + }, >> + { >> + .reg = CH1_DIMM_TEMP_REG, >> + .label = "temp6 CH1 DIMM" >> + }, >> + { >> + .reg = CH2_DIMM_TEMP_REG, >> + .label = "temp7 CH2 DIMM" >> + }, >> + { >> + .reg = CH3_DIMM_TEMP_REG, >> + .label = "temp8 CH3 DIMM" >> + }, >> + { >> + .reg = CH4_DIMM_TEMP_REG, >> + .label = "temp9 CH4 DIMM" >> + }, >> + { >> + .reg = CH5_DIMM_TEMP_REG, >> + .label = "temp10 CH5 DIMM" >> + }, >> + { >> + .reg = CH6_DIMM_TEMP_REG, >> + .label = "temp11 CH6 DIMM" >> + }, >> + { >> + .reg = CH7_DIMM_TEMP_REG, >> + .label = "temp12 CH7 DIMM" >> + }, >> + { >> + .reg = RCA_VRD_TEMP_REG, >> + .label = "temp13 RCA VRD" >> + }, >> +}; >> + >> +static const struct smpro_sensor voltage[] = { >> + { >> + .reg = CORE_VRD_VOLT_REG, >> + .label = "vout0 CORE VRD" >> + }, >> + { >> + .reg = SOC_VRD_VOLT_REG, >> + .label = "vout1 SoC VRD" >> + }, >> + { >> + .reg = DIMM_VRD1_VOLT_REG, >> + .label = "vout2 DIMM VRD1" >> + }, >> + { >> + .reg = DIMM_VRD2_VOLT_REG, >> + .label = "vout3 DIMM VRD2" >> + }, >> + { >> + .reg = RCA_VRD_VOLT_REG, >> + .label = "vout4 RCA VRD" >> + }, >> +}; >> + >> +static const struct smpro_sensor curr_sensor[] = { >> + { >> + .reg = CORE_VRD_CURR_REG, >> + .label = "iout1 CORE VRD" >> + }, >> + { >> + .reg = SOC_VRD_CURR_REG, >> + .label = "iout2 SoC VRD" >> + }, >> + { >> + .reg = DIMM_VRD1_CURR_REG, >> + .label = "iout3 DIMM VRD1" >> + }, >> + { >> + .reg = DIMM_VRD2_CURR_REG, >> + .label = "iout4 DIMM VRD2" >> + }, >> + { >> + .reg = RCA_VRD_CURR_REG, >> + .label = "iout5 RCA VRD" >> + }, >> +}; >> + >> +static const struct smpro_sensor power[] = { >> + { >> + .reg = CORE_VRD_PWR_REG, >> + .reg_ext = CORE_VRD_PWR_MW_REG, >> + .label = "power1 CORE VRD" >> + }, >> + { >> + .reg = SOC_PWR_REG, >> + .reg_ext = SOC_PWR_MW_REG, >> + .label = "power2 SoC" >> + }, >> + { >> + .reg = DIMM_VRD1_PWR_REG, >> + .reg_ext = DIMM_VRD1_PWR_MW_REG, >> + .label = "power3 DIMM VRD1" >> + }, >> + { >> + .reg = DIMM_VRD2_PWR_REG, >> + .reg_ext = DIMM_VRD2_PWR_MW_REG, >> + .label = "power4 DIMM VRD2" >> + }, >> + { >> + .reg = RCA_VRD_PWR_REG, >> + .reg_ext = RCA_VRD_PWR_MW_REG, >> + .label = "power5 RCA VRD" >> + }, >> +}; >> + >> +static int smpro_read_temp(struct device *dev, u32 attr, int channel, long *val) >> +{ >> + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); >> + unsigned int value; >> + int ret; >> + >> + switch (attr) { >> + case hwmon_temp_input: >> + ret = regmap_read(hwmon->regmap, >> + temperature[channel].reg, &value); >> + if (ret) >> + return ret; >> + *val = (value & 0x1ff) * 1000; >> + break; >> + case hwmon_temp_crit: >> + if (temperature[channel].reg == SOC_VRD_TEMP_REG) { >> + ret = regmap_read(hwmon->regmap, SOC_VR_HOT_THRESHOLD_REG, &value); >> + if (ret) >> + return ret; >> + *val = (value & 0x1ff) * 1000; >> + } else { >> + /* Report same MEM HOT threshold across DIMM channels */ >> + ret = regmap_read(hwmon->regmap, MEM_HOT_THRESHOLD_REG, &value); >> + if (ret) >> + return ret; >> + *val = (value & 0x1ff) * 1000; >> + } > > To avoid code duplication: > > reg = temperature[channel].reg == SOC_VRD_TEMP_REG ? SOC_VR_HOT_THRESHOLD_REG : MEM_HOT_THRESHOLD_REG; > ret = regmap_read(hwmon->regmap, reg, &value); > if (ret) > return ret; > > But then why don't you just use reg_ext to store SOC_VR_HOT_THRESHOLD_REG > or MEM_HOT_THRESHOLD_REG ? It is already available, after all, and with it > the code could be simplified to > > ret = regmap_read(hwmon->regmap, temperature[channel].reg_ext, &value); > if (ret) > return ret; > Thank you for the comment. Will change code follow this suggestion, will include in next version > I don't have a datasheet, but I do wonder what is in bit 9..15. Any idea ? > Main question is if there is a sign bit, as theoretic as it may be. > The original intention was to use this as 9-bit 2-complement value follow LM75, but the fact is that the operation temperature is 0-125 C degree, so we simply use it as-is. >> + break; >> + default: >> + return -EOPNOTSUPP; >> + } >> + return 0; >> +} >> + >> +static int smpro_read_in(struct device *dev, u32 attr, int channel, long *val) >> +{ >> + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); >> + unsigned int value; >> + int ret; >> + >> + switch (attr) { >> + case hwmon_in_input: >> + ret = regmap_read(hwmon->regmap, voltage[channel].reg, &value); >> + if (ret < 0) >> + return ret; >> + /* Scale reported by the hardware is 1mV */ >> + *val = value & 0x7fff; > > What is in bit 15 ? > This is 15-bit voltage in mV so the bit 15 (0-15) is unused. >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static int smpro_read_curr(struct device *dev, u32 attr, int channel, long *val) >> +{ >> + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); >> + unsigned int value; >> + int ret; >> + >> + switch (attr) { >> + case hwmon_curr_input: >> + ret = regmap_read(hwmon->regmap, curr_sensor[channel].reg, &value); >> + if (ret < 0) >> + return ret; >> + /* Scale reported by the hardware is 1mA */ >> + *val = value & 0x7fff; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static int smpro_read_power(struct device *dev, u32 attr, int channel, long *val_pwr) >> +{ >> + struct smpro_hwmon *hwmon = dev_get_drvdata(dev); >> + unsigned int val = 0, val_mw = 0; >> + int ret; >> + >> + switch (attr) { >> + case hwmon_power_input: >> + ret = regmap_read(hwmon->regmap, power[channel].reg, &val); >> + if (ret) >> + return ret; >> + >> + ret = regmap_read(hwmon->regmap, power[channel].reg_ext, &val_mw); >> + if (ret) >> + return ret; >> + >> + *val_pwr = val * 1000000 + val_mw * 1000; >> + return 0; >> + >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static int smpro_read(struct device *dev, enum hwmon_sensor_types type, >> + u32 attr, int channel, long *val) >> +{ >> + switch (type) { >> + case hwmon_temp: >> + return smpro_read_temp(dev, attr, channel, val); >> + case hwmon_in: >> + return smpro_read_in(dev, attr, channel, val); >> + case hwmon_power: >> + return smpro_read_power(dev, attr, channel, val); >> + case hwmon_curr: >> + return smpro_read_curr(dev, attr, channel, val); >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static int smpro_write(struct device *dev, enum hwmon_sensor_types type, >> + u32 attr, int channel, long val) >> +{ >> + return -EOPNOTSUPP; >> +} > > There are no writeable attributes, thus the write function is not needed. > Agree, will remove in next version >> + >> +static int smpro_read_string(struct device *dev, enum hwmon_sensor_types type, >> + u32 attr, int channel, const char **str) >> +{ >> + switch (type) { >> + case hwmon_temp: >> + switch (attr) { >> + case hwmon_temp_label: >> + *str = temperature[channel].label; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> + break; >> + >> + case hwmon_in: >> + switch (attr) { >> + case hwmon_in_label: >> + *str = voltage[channel].label; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> + break; >> + >> + case hwmon_curr: >> + switch (attr) { >> + case hwmon_curr_label: >> + *str = curr_sensor[channel].label; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> + break; >> + >> + case hwmon_power: >> + switch (attr) { >> + case hwmon_power_label: >> + *str = power[channel].label; >> + return 0; >> + default: >> + return -EOPNOTSUPP; >> + } >> + break; >> + default: >> + return -EOPNOTSUPP; >> + } >> + >> + return -EOPNOTSUPP; > > If you are returning -ENOPSUPP by default, might as well replace > all the same returns above with break; > Yes, will fix as you suggested. Will include in next version >> +} >> + >> +static umode_t smpro_is_visible(const void *data, enum hwmon_sensor_types type, >> + u32 attr, int channel) >> +{ >> + const struct smpro_hwmon *hwmon = data; >> + unsigned int value; >> + int ret; >> + >> + switch (type) { >> + case hwmon_temp: >> + switch (attr) { >> + case hwmon_temp_input: >> + case hwmon_temp_label: >> + case hwmon_temp_crit: >> + ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value); >> + if (ret || value == 0xFFFF) >> + return 0; >> + break; >> + } >> + default: >> + break; >> + } >> + >> + return 0444; >> +} >> + >> +static const struct hwmon_channel_info *smpro_info[] = { >> + HWMON_CHANNEL_INFO(temp, >> + HWMON_T_INPUT | HWMON_T_LABEL, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL, >> + HWMON_T_INPUT | HWMON_T_LABEL, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT, >> + HWMON_T_INPUT | HWMON_T_LABEL), >> + HWMON_CHANNEL_INFO(in, >> + HWMON_I_INPUT | HWMON_I_LABEL, >> + HWMON_I_INPUT | HWMON_I_LABEL, >> + HWMON_I_INPUT | HWMON_I_LABEL, >> + HWMON_I_INPUT | HWMON_I_LABEL, >> + HWMON_I_INPUT | HWMON_I_LABEL), >> + HWMON_CHANNEL_INFO(power, >> + HWMON_P_INPUT | HWMON_P_LABEL, >> + HWMON_P_INPUT | HWMON_P_LABEL, >> + HWMON_P_INPUT | HWMON_P_LABEL, >> + HWMON_P_INPUT | HWMON_P_LABEL, >> + HWMON_P_INPUT | HWMON_P_LABEL), >> + HWMON_CHANNEL_INFO(curr, >> + HWMON_C_INPUT | HWMON_C_LABEL, >> + HWMON_C_INPUT | HWMON_C_LABEL, >> + HWMON_C_INPUT | HWMON_C_LABEL, >> + HWMON_C_INPUT | HWMON_C_LABEL, >> + HWMON_C_INPUT | HWMON_C_LABEL), >> + NULL >> +}; >> + >> +static const struct hwmon_ops smpro_hwmon_ops = { >> + .is_visible = smpro_is_visible, >> + .read = smpro_read, >> + .write = smpro_write, >> + .read_string = smpro_read_string, >> +}; >> + >> +static const struct hwmon_chip_info smpro_chip_info = { >> + .ops = &smpro_hwmon_ops, >> + .info = smpro_info, >> +}; >> + >> +static bool is_valid_id(struct regmap *regmap) >> +{ >> + unsigned int val; >> + int ret; >> + >> + ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val); >> + >> + return (ret || (val != AMPERE_MANUFACTURER_ID)) ? false : true; > > I am quite concerned about this: The calling code will translate it to > -EPROBE_DEFER even if the manufacturer ID is wrong. It should return > -ENODEV in that case. There should be a better means to determine if the > controller is not available at all, or not yet. > Yes, I agree Will fix in next version: + if the regmap_read return error, return -EPROBE_DEFER + if manufacturer ID is wrong, return -ENODEV >> +} >> + >> +static int smpro_hwmon_probe(struct platform_device *pdev) >> +{ >> + struct smpro_hwmon *hwmon; >> + struct device *hwmon_dev; >> + >> + hwmon = devm_kzalloc(&pdev->dev, sizeof(struct smpro_hwmon), GFP_KERNEL); >> + if (!hwmon) >> + return -ENOMEM; >> + >> + hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL); >> + if (!hwmon->regmap) >> + return -ENODEV; >> + >> + /* Check for valid ID */ >> + if (!is_valid_id(hwmon->regmap)) >> + return -EPROBE_DEFER; >> + >> + hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "smpro_hwmon", >> + hwmon, &smpro_chip_info, NULL); >> + >> + return PTR_ERR_OR_ZERO(hwmon_dev); >> +} >> + >> +static const struct of_device_id smpro_hwmon_of_match[] = { >> + { .compatible = "ampere,ac01-hwmon" }, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(of, smpro_hwmon_of_match); >> + >> +static struct platform_driver smpro_hwmon_driver = { >> + .probe = smpro_hwmon_probe, >> + .driver = { >> + .name = "smpro-hwmon", >> + .of_match_table = smpro_hwmon_of_match, >> + }, >> +}; >> + >> +module_platform_driver(smpro_hwmon_driver); >> + >> +MODULE_AUTHOR("Thu Nguyen "); >> +MODULE_AUTHOR("Quan Nguyen "); >> +MODULE_DESCRIPTION("Ampere Altra SMPro hwmon driver"); >> +MODULE_LICENSE("GPL v2"); >> >