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Fri, 28 Aug 2020 07:21:45 +0000 From: Ugur Usug To: "linux@roeck-us.net" CC: "linux-hwmon@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: [PATCH v3] hwmon (pmbus/max20730): add device monitoring via debugfs Thread-Topic: [PATCH v3] hwmon (pmbus/max20730): add device monitoring via debugfs Thread-Index: AdZ9BYrb7uWFZZAhRYedhNJBM8IF/Q== Date: Fri, 28 Aug 2020 07:21:45 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: roeck-us.net; dkim=none (message not signed) header.d=none;roeck-us.net; dmarc=none action=none header.from=maximintegrated.com; x-originating-ip: [176.236.34.235] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: e61d8265-061d-4946-30b1-08d84b230556 x-ms-traffictypediagnostic: MWHPR11MB1869: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:551; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: IUZB7tZtH0xomrSXZ8+jDfS7ZvnajilcGgkGM2WUc0RaieH8+OIrgZFAl8fuiVqeQqtUYyhfmh4+doLeUDEIOhAtY2gIk/9CAiC3wyztGJUZm6Edde291gyLnSgSS5zaMn3rXjHtfQavlos7ts5jlJnjrskv4djUgZbOmtVOr0D/LGcze10xETOxWroGggSM4uXxHHlpTbodB1JwuQYk9DAhUAFX0SUwaM70MEaDxFmgFjh/LGsfXUk+xJoakhLoPfjCBUx3GFrWeIAIjAf7k7PyC79vL8ETOhqUrB0MYWvrtUhPvWOpdjgHs5RhvAjWjzBa5oYRkq2BY3AGdH2aWg== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MWHPR11MB1965.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(39860400002)(136003)(346002)(376002)(396003)(366004)(66476007)(66446008)(30864003)(8676002)(316002)(2906002)(478600001)(186003)(71200400001)(5660300002)(33656002)(54906003)(83380400001)(66946007)(86362001)(6916009)(9686003)(55016002)(7696005)(66556008)(64756008)(6506007)(76116006)(52536014)(4326008)(8936002)(26005);DIR:OUT;SFP:1102; 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Signed-off-by: Ugur Usug --- drivers/hwmon/pmbus/max20730.c | 365 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 364 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/pmbus/max20730.c b/drivers/hwmon/pmbus/max20730.c index a151a2b..2115772 100644 --- a/drivers/hwmon/pmbus/max20730.c +++ b/drivers/hwmon/pmbus/max20730.c @@ -8,6 +8,7 @@ */ #include +#include #include #include #include @@ -26,16 +27,369 @@ enum chips { max20743 }; +enum { + MAX20730_DEBUGFS_VOUT_MIN = 0, + MAX20730_DEBUGFS_FREQUENCY, + MAX20730_DEBUGFS_PG_DELAY, + MAX20730_DEBUGFS_INTERNAL_GAIN, + MAX20730_DEBUGFS_BOOT_VOLTAGE, + MAX20730_DEBUGFS_OUT_V_RAMP_RATE, + MAX20730_DEBUGFS_OC_PROTECT_MODE, + MAX20730_DEBUGFS_SS_TIMING, + MAX20730_DEBUGFS_IMAX, + MAX20730_DEBUGFS_OPERATION, + MAX20730_DEBUGFS_ON_OFF_CONFIG, + MAX20730_DEBUGFS_SMBALERT_MASK, + MAX20730_DEBUGFS_VOUT_MODE, + MAX20730_DEBUGFS_VOUT_COMMAND, + MAX20730_DEBUGFS_VOUT_MAX, + MAX20730_DEBUGFS_NUM_ENTRIES +}; + struct max20730_data { enum chips id; struct pmbus_driver_info info; struct mutex lock; /* Used to protect against parallel writes */ u16 mfr_devset1; + u16 mfr_devset2; + u16 mfr_voutmin; }; #define to_max20730_data(x) container_of(x, struct max20730_data, info) +#define PMBUS_SMB_ALERT_MASK 0x1B + +#define MAX20730_MFR_VOUT_MIN 0xd1 #define MAX20730_MFR_DEVSET1 0xd2 +#define MAX20730_MFR_DEVSET2 0xd3 + +#define MAX20730_MFR_VOUT_MIN_MASK GENMASK(9, 0) +#define MAX20730_MFR_VOUT_MIN_BIT_POS 0 + +#define MAX20730_MFR_DEVSET1_RGAIN_MASK (BIT(13) | BIT(14)) +#define MAX20730_MFR_DEVSET1_OTP_MASK (BIT(11) | BIT(12)) +#define MAX20730_MFR_DEVSET1_VBOOT_MASK (BIT(8) | BIT(9)) +#define MAX20730_MFR_DEVSET1_OCP_MASK (BIT(5) | BIT(6)) +#define MAX20730_MFR_DEVSET1_FSW_MASK GENMASK(4, 2) +#define MAX20730_MFR_DEVSET1_TSTAT_MASK (BIT(0) | BIT(1)) + +#define MAX20730_MFR_DEVSET1_RGAIN_BIT_POS 13 +#define MAX20730_MFR_DEVSET1_OTP_BIT_POS 11 +#define MAX20730_MFR_DEVSET1_VBOOT_BIT_POS 8 +#define MAX20730_MFR_DEVSET1_OCP_BIT_POS 5 +#define MAX20730_MFR_DEVSET1_FSW_BIT_POS 2 +#define MAX20730_MFR_DEVSET1_TSTAT_BIT_POS 0 + +#define MAX20730_MFR_DEVSET2_IMAX_MASK GENMASK(10, 8) +#define MAX20730_MFR_DEVSET2_VRATE (BIT(6) | BIT(7)) +#define MAX20730_MFR_DEVSET2_OCPM_MASK BIT(5) +#define MAX20730_MFR_DEVSET2_SS_MASK (BIT(0) | BIT(1)) + +#define MAX20730_MFR_DEVSET2_IMAX_BIT_POS 8 +#define MAX20730_MFR_DEVSET2_VRATE_BIT_POS 6 +#define MAX20730_MFR_DEVSET2_OCPM_BIT_POS 5 +#define MAX20730_MFR_DEVSET2_SS_BIT_POS 0 + +#define DEBUG_FS_DATA_MAX 8 + +struct max20730_debugfs_data { + struct i2c_client *client; + int debugfs_entries[MAX20730_DEBUGFS_NUM_ENTRIES]; +}; + +#define to_psu(x, y) container_of((x), \ + struct max20730_debugfs_data, debugfs_entries[(y)]) + +#ifdef CONFIG_DEBUG_FS +static ssize_t max20730_debugfs_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + int ret, len; + int *idxp = file->private_data; + int idx = *idxp; + struct max20730_debugfs_data *psu = to_psu(idxp, idx); + const struct pmbus_driver_info *info; + const struct max20730_data *data; + char tbuf[DEBUG_FS_DATA_MAX + 2] = { 0 }; + u16 val; + + info = pmbus_get_driver_info(psu->client); + data = to_max20730_data(info); + + switch (idx) { + case MAX20730_DEBUGFS_VOUT_MIN: + len = snprintf(tbuf, 5, "%d", data->mfr_voutmin); + break; + case MAX20730_DEBUGFS_FREQUENCY: + val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_FSW_MASK) + >> MAX20730_MFR_DEVSET1_FSW_BIT_POS; + if (val == 0) + ret = 400; + else if (val == 1) + ret = 500; + else if (val == 2 || val == 3) + ret = 600; + else if (val == 4) + ret = 700; + else if (val == 5) + ret = 800; + else + ret = 900; + len = snprintf(tbuf, 4, "%d", ret); + break; + case MAX20730_DEBUGFS_PG_DELAY: + val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_TSTAT_MASK) + >> MAX20730_MFR_DEVSET1_TSTAT_BIT_POS; + + if (val == 0) + strcpy(tbuf, "2000"); + else if (val == 1) + strcpy(tbuf, "125"); + else if (val == 2) + strcpy(tbuf, "62.5"); + else + strcpy(tbuf, "32"); + len = strnlen(tbuf, DEBUG_FS_DATA_MAX); + break; + + case MAX20730_DEBUGFS_INTERNAL_GAIN: + val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_RGAIN_MASK) + >> MAX20730_MFR_DEVSET1_RGAIN_BIT_POS; + + if (data->id == max20734) { + /* AN6209 */ + if (val == 0) + strcpy(tbuf, "0.8"); + else if (val == 1) + strcpy(tbuf, "3.2"); + else if (val == 2) + strcpy(tbuf, "1.6"); + else + strcpy(tbuf, "6.4"); + } else if (data->id == max20730 || data->id == max20710) { + /* AN6042 or AN6140 */ + if (val == 0) + strcpy(tbuf, "0.9"); + else if (val == 1) + strcpy(tbuf, "3.6"); + else if (val == 2) + strcpy(tbuf, "1.8"); + else + strcpy(tbuf, "7.2"); + } else if (data->id == max20743) { + /* AN6042 */ + if (val == 0) + strcpy(tbuf, "0.45"); + else if (val == 1) + strcpy(tbuf, "1.8"); + else if (val == 2) + strcpy(tbuf, "0.9"); + else + strcpy(tbuf, "3.6"); + } else { + return -EINVAL; + } + + len = strnlen(tbuf, DEBUG_FS_DATA_MAX); + break; + case MAX20730_DEBUGFS_BOOT_VOLTAGE: + val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_VBOOT_MASK) + >> MAX20730_MFR_DEVSET1_VBOOT_BIT_POS; + + if (val == 0) + strcpy(tbuf, "0.6484"); + else if (val == 1) + strcpy(tbuf, "0.8984"); + else if (val == 2) + strcpy(tbuf, "1.0"); + else + return -EINVAL; + + len = strnlen(tbuf, DEBUG_FS_DATA_MAX); + break; + case MAX20730_DEBUGFS_OUT_V_RAMP_RATE: + val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_VRATE) + >> MAX20730_MFR_DEVSET2_VRATE_BIT_POS; + + if (val == 0) + ret = 4; + else if (val == 1) + ret = 2; + else if (val == 2) + ret = 1; + else + return -EINVAL; + + len = snprintf(tbuf, 2, "%d", ret); + break; + case MAX20730_DEBUGFS_OC_PROTECT_MODE: + ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_OCPM_MASK) + >> MAX20730_MFR_DEVSET2_OCPM_BIT_POS; + len = snprintf(tbuf, 2, "%d", ret); + break; + case MAX20730_DEBUGFS_SS_TIMING: + val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_SS_MASK) + >> MAX20730_MFR_DEVSET2_SS_BIT_POS; + + if (val == 0) + strcpy(tbuf, "0.75"); + else if (val == 1) + strcpy(tbuf, "1.5"); + else if (val == 2) + strcpy(tbuf, "3"); + else + strcpy(tbuf, "6"); + + len = strnlen(tbuf, DEBUG_FS_DATA_MAX); + break; + case MAX20730_DEBUGFS_IMAX: + ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_IMAX_MASK) + >> MAX20730_MFR_DEVSET2_IMAX_BIT_POS; + len = snprintf(tbuf, 2, "%d", ret); + break; + case MAX20730_DEBUGFS_OPERATION: + ret = i2c_smbus_read_byte_data(psu->client, PMBUS_OPERATION); + if (ret < 0) + return ret; + len = snprintf(tbuf, 2, "%d", ret); + break; + case MAX20730_DEBUGFS_ON_OFF_CONFIG: + ret = i2c_smbus_read_byte_data(psu->client, PMBUS_ON_OFF_CONFIG); + if (ret < 0) + return ret; + len = snprintf(tbuf, 2, "%d", ret); + break; + case MAX20730_DEBUGFS_SMBALERT_MASK: + ret = i2c_smbus_read_word_data(psu->client, + PMBUS_SMB_ALERT_MASK); + if (ret < 0) + return ret; + len = snprintf(tbuf, 3, "%d", ret); + break; + case MAX20730_DEBUGFS_VOUT_MODE: + ret = i2c_smbus_read_byte_data(psu->client, PMBUS_VOUT_MODE); + if (ret < 0) + return ret; + len = snprintf(tbuf, 2, "%d", ret); + break; + case MAX20730_DEBUGFS_VOUT_COMMAND: + ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_COMMAND); + if (ret < 0) + return ret; + len = snprintf(tbuf, 3, "%d", ret); + break; + case MAX20730_DEBUGFS_VOUT_MAX: + ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_MAX); + if (ret < 0) + return ret; + len = snprintf(tbuf, 3, "%d", ret); + break; + default: + return -EINVAL; + } + + tbuf[len] = '\n'; + len += 2; + + return simple_read_from_buffer(buf, count, ppos, tbuf, len); +} + +static const struct file_operations max20730_fops = { + .llseek = noop_llseek, + .read = max20730_debugfs_read, + .write = NULL, + .open = simple_open, +}; + +static int max20730_init_debugfs(struct i2c_client *client, + struct max20730_data *data) +{ + int ret, i; + struct dentry *debugfs; + struct dentry *max20730_dir; + struct max20730_debugfs_data *psu; + + ret = i2c_smbus_read_word_data(client, MAX20730_MFR_DEVSET2); + if (ret < 0) + return ret; + data->mfr_devset2 = ret; + + ret = i2c_smbus_read_word_data(client, MAX20730_MFR_VOUT_MIN); + if (ret < 0) + return ret; + data->mfr_voutmin = ret; + + psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); + if (!psu) + return -ENOMEM; + psu->client = client; + + debugfs = pmbus_get_debugfs_dir(client); + if (!debugfs) + return -ENOENT; + + max20730_dir = debugfs_create_dir(client->name, debugfs); + if (!max20730_dir) + return -ENOENT; + + for (i = 0; i < MAX20730_DEBUGFS_NUM_ENTRIES; ++i) + psu->debugfs_entries[i] = i; + + debugfs_create_file("vout_min", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MIN], + &max20730_fops); + debugfs_create_file("frequency", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_FREQUENCY], + &max20730_fops); + debugfs_create_file("power_good_delay", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_PG_DELAY], + &max20730_fops); + debugfs_create_file("internal_gain", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_INTERNAL_GAIN], + &max20730_fops); + debugfs_create_file("boot_voltage", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_BOOT_VOLTAGE], + &max20730_fops); + debugfs_create_file("out_voltage_ramp_rate", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_OUT_V_RAMP_RATE], + &max20730_fops); + debugfs_create_file("oc_protection_mode", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_OC_PROTECT_MODE], + &max20730_fops); + debugfs_create_file("soft_start_timing", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_SS_TIMING], + &max20730_fops); + debugfs_create_file("imax", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_IMAX], + &max20730_fops); + debugfs_create_file("operation", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_OPERATION], + &max20730_fops); + debugfs_create_file("on_off_config", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_ON_OFF_CONFIG], + &max20730_fops); + debugfs_create_file("smbalert_mask", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_SMBALERT_MASK], + &max20730_fops); + debugfs_create_file("vout_mode", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MODE], + &max20730_fops); + debugfs_create_file("vout_command", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_COMMAND], + &max20730_fops); + debugfs_create_file("vout_max", 0444, max20730_dir, + &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MAX], + &max20730_fops); + + return 0; +} +#else +static int max20730_init_debugfs(struct i2c_client *client, + struct max20730_data *data) +{ + return 0; +} +#endif /* CONFIG_DEBUG_FS */ /* * Convert discreet value to direct data format. Strictly speaking, all passed @@ -370,7 +724,16 @@ static int max20730_probe(struct i2c_client *client, return ret; data->mfr_devset1 = ret; - return pmbus_do_probe(client, id, &data->info); + ret = pmbus_do_probe(client, id, &data->info); + if (ret < 0) + return ret; + + ret = max20730_init_debugfs(client, data); + if (ret) + dev_warn(dev, "Failed to register debugfs: %d\n", + ret); + + return 0; } static const struct i2c_device_id max20730_id[] = {