// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for MAX20710, MAX20730, MAX20734, and MAX20743 Integrated, * Step-Down Switching Regulators * * Copyright 2019 Google LLC. * Copyright 2020 Maxim Integrated */ #include #include #include #include #include #include #include #include #include #include #include #include "pmbus.h" enum chips { max20710, max20730, max20734, 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; u32 vout_voltage_divider[2]; }; #define to_max20730_data(x) container_of(x, struct max20730_data, info) #define VOLT_FROM_REG(val) DIV_ROUND_CLOSEST((val), 1 << 9) #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 16 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] = { 0 }; u16 val; info = pmbus_get_driver_info(psu->client); data = to_max20730_data(info); switch (idx) { case MAX20730_DEBUGFS_VOUT_MIN: ret = VOLT_FROM_REG(data->mfr_voutmin * 10000); len = snprintf(tbuf, DEBUG_FS_DATA_MAX, "%d.%d\n", ret / 10000, ret % 10000); 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, DEBUG_FS_DATA_MAX, "%d\n", 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) len = strlcpy(tbuf, "2000\n", DEBUG_FS_DATA_MAX); else if (val == 1) len = strlcpy(tbuf, "125\n", DEBUG_FS_DATA_MAX); else if (val == 2) len = strlcpy(tbuf, "62.5\n", DEBUG_FS_DATA_MAX); else len = strlcpy(tbuf, "32\n", 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) len = strlcpy(tbuf, "0.8\n", DEBUG_FS_DATA_MAX); else if (val == 1) len = strlcpy(tbuf, "3.2\n", DEBUG_FS_DATA_MAX); else if (val == 2) len = strlcpy(tbuf, "1.6\n", DEBUG_FS_DATA_MAX); else len = strlcpy(tbuf, "6.4\n", DEBUG_FS_DATA_MAX); } else if (data->id == max20730 || data->id == max20710) { /* AN6042 or AN6140 */ if (val == 0) len = strlcpy(tbuf, "0.9\n", DEBUG_FS_DATA_MAX); else if (val == 1) len = strlcpy(tbuf, "3.6\n", DEBUG_FS_DATA_MAX); else if (val == 2) len = strlcpy(tbuf, "1.8\n", DEBUG_FS_DATA_MAX); else len = strlcpy(tbuf, "7.2\n", DEBUG_FS_DATA_MAX); } else if (data->id == max20743) { /* AN6042 */ if (val == 0) len = strlcpy(tbuf, "0.45\n", DEBUG_FS_DATA_MAX); else if (val == 1) len = strlcpy(tbuf, "1.8\n", DEBUG_FS_DATA_MAX); else if (val == 2) len = strlcpy(tbuf, "0.9\n", DEBUG_FS_DATA_MAX); else len = strlcpy(tbuf, "3.6\n", DEBUG_FS_DATA_MAX); } else { len = strlcpy(tbuf, "Not supported\n", 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) len = strlcpy(tbuf, "0.6484\n", DEBUG_FS_DATA_MAX); else if (val == 1) len = strlcpy(tbuf, "0.8984\n", DEBUG_FS_DATA_MAX); else if (val == 2) len = strlcpy(tbuf, "1.0\n", DEBUG_FS_DATA_MAX); else len = strlcpy(tbuf, "Invalid\n", 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) len = strlcpy(tbuf, "4\n", DEBUG_FS_DATA_MAX); else if (val == 1) len = strlcpy(tbuf, "2\n", DEBUG_FS_DATA_MAX); else if (val == 2) len = strlcpy(tbuf, "1\n", DEBUG_FS_DATA_MAX); else len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX); 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, DEBUG_FS_DATA_MAX, "%d\n", 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) len = strlcpy(tbuf, "0.75\n", DEBUG_FS_DATA_MAX); else if (val == 1) len = strlcpy(tbuf, "1.5\n", DEBUG_FS_DATA_MAX); else if (val == 2) len = strlcpy(tbuf, "3\n", DEBUG_FS_DATA_MAX); else len = strlcpy(tbuf, "6\n", 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, DEBUG_FS_DATA_MAX, "%d\n", ret); break; case MAX20730_DEBUGFS_OPERATION: ret = i2c_smbus_read_byte_data(psu->client, PMBUS_OPERATION); if (ret < 0) return ret; len = snprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", 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, DEBUG_FS_DATA_MAX, "%d\n", 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, DEBUG_FS_DATA_MAX, "%d\n", 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, DEBUG_FS_DATA_MAX, "%d\n", ret); break; case MAX20730_DEBUGFS_VOUT_COMMAND: ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_COMMAND); if (ret < 0) return ret; ret = VOLT_FROM_REG(ret * 10000); len = snprintf(tbuf, DEBUG_FS_DATA_MAX, "%d.%d\n", ret / 10000, ret % 10000); break; case MAX20730_DEBUGFS_VOUT_MAX: ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_MAX); if (ret < 0) return ret; ret = VOLT_FROM_REG(ret * 10000); len = snprintf(tbuf, DEBUG_FS_DATA_MAX, "%d.%d\n", ret / 10000, ret % 10000); break; default: len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX); } 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 */ static const struct i2c_device_id max20730_id[]; /* * Convert discreet value to direct data format. Strictly speaking, all passed * values are constants, so we could do that calculation manually. On the * downside, that would make the driver more difficult to maintain, so lets * use this approach. */ static u16 val_to_direct(int v, enum pmbus_sensor_classes class, const struct pmbus_driver_info *info) { int R = info->R[class] - 3; /* take milli-units into account */ int b = info->b[class] * 1000; long d; d = v * info->m[class] + b; /* * R < 0 is true for all callers, so we don't need to bother * about the R > 0 case. */ while (R < 0) { d = DIV_ROUND_CLOSEST(d, 10); R++; } return (u16)d; } static long direct_to_val(u16 w, enum pmbus_sensor_classes class, const struct pmbus_driver_info *info) { int R = info->R[class] - 3; int b = info->b[class] * 1000; int m = info->m[class]; long d = (s16)w; if (m == 0) return 0; while (R < 0) { d *= 10; R++; } d = (d - b) / m; return d; } static u32 max_current[][5] = { [max20710] = { 6200, 8000, 9700, 11600 }, [max20730] = { 13000, 16600, 20100, 23600 }, [max20734] = { 21000, 27000, 32000, 38000 }, [max20743] = { 18900, 24100, 29200, 34100 }, }; static int max20730_read_word_data(struct i2c_client *client, int page, int phase, int reg) { const struct pmbus_driver_info *info = pmbus_get_driver_info(client); const struct max20730_data *data = to_max20730_data(info); int ret = 0; u32 max_c; switch (reg) { case PMBUS_OT_FAULT_LIMIT: switch ((data->mfr_devset1 >> 11) & 0x3) { case 0x0: ret = val_to_direct(150000, PSC_TEMPERATURE, info); break; case 0x1: ret = val_to_direct(130000, PSC_TEMPERATURE, info); break; default: ret = -ENODATA; break; } break; case PMBUS_IOUT_OC_FAULT_LIMIT: max_c = max_current[data->id][(data->mfr_devset1 >> 5) & 0x3]; ret = val_to_direct(max_c, PSC_CURRENT_OUT, info); break; case PMBUS_READ_VOUT: ret = pmbus_read_word_data(client, page, phase, reg); if (ret > 0 && data->vout_voltage_divider[0] && data->vout_voltage_divider[1]) { u64 temp = DIV_ROUND_CLOSEST_ULL((u64)ret * data->vout_voltage_divider[1], data->vout_voltage_divider[0]); ret = clamp_val(temp, 0, 0xffff); } break; default: ret = -ENODATA; break; } return ret; } static int max20730_write_word_data(struct i2c_client *client, int page, int reg, u16 word) { struct pmbus_driver_info *info; struct max20730_data *data; u16 devset1; int ret = 0; int idx; info = (struct pmbus_driver_info *)pmbus_get_driver_info(client); data = to_max20730_data(info); mutex_lock(&data->lock); devset1 = data->mfr_devset1; switch (reg) { case PMBUS_OT_FAULT_LIMIT: devset1 &= ~(BIT(11) | BIT(12)); if (direct_to_val(word, PSC_TEMPERATURE, info) < 140000) devset1 |= BIT(11); break; case PMBUS_IOUT_OC_FAULT_LIMIT: devset1 &= ~(BIT(5) | BIT(6)); idx = find_closest(direct_to_val(word, PSC_CURRENT_OUT, info), max_current[data->id], 4); devset1 |= (idx << 5); break; default: ret = -ENODATA; break; } if (!ret && devset1 != data->mfr_devset1) { ret = i2c_smbus_write_word_data(client, MAX20730_MFR_DEVSET1, devset1); if (!ret) { data->mfr_devset1 = devset1; pmbus_clear_cache(client); } } mutex_unlock(&data->lock); return ret; } static const struct pmbus_driver_info max20730_info[] = { [max20710] = { .pages = 1, .read_word_data = max20730_read_word_data, .write_word_data = max20730_write_word_data, /* Source : Maxim AN6140 and AN6042 */ .format[PSC_TEMPERATURE] = direct, .m[PSC_TEMPERATURE] = 21, .b[PSC_TEMPERATURE] = 5887, .R[PSC_TEMPERATURE] = -1, .format[PSC_VOLTAGE_IN] = direct, .m[PSC_VOLTAGE_IN] = 3609, .b[PSC_VOLTAGE_IN] = 0, .R[PSC_VOLTAGE_IN] = -2, .format[PSC_CURRENT_OUT] = direct, .m[PSC_CURRENT_OUT] = 153, .b[PSC_CURRENT_OUT] = 4976, .R[PSC_CURRENT_OUT] = -1, .format[PSC_VOLTAGE_OUT] = linear, .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_INPUT, }, [max20730] = { .pages = 1, .read_word_data = max20730_read_word_data, .write_word_data = max20730_write_word_data, /* Source : Maxim AN6042 */ .format[PSC_TEMPERATURE] = direct, .m[PSC_TEMPERATURE] = 21, .b[PSC_TEMPERATURE] = 5887, .R[PSC_TEMPERATURE] = -1, .format[PSC_VOLTAGE_IN] = direct, .m[PSC_VOLTAGE_IN] = 3609, .b[PSC_VOLTAGE_IN] = 0, .R[PSC_VOLTAGE_IN] = -2, /* * Values in the datasheet are adjusted for temperature and * for the relationship between Vin and Vout. * Unfortunately, the data sheet suggests that Vout measurement * may be scaled with a resistor array. This is indeed the case * at least on the evaulation boards. As a result, any in-driver * adjustments would either be wrong or require elaborate means * to configure the scaling. Instead of doing that, just report * raw values and let userspace handle adjustments. */ .format[PSC_CURRENT_OUT] = direct, .m[PSC_CURRENT_OUT] = 153, .b[PSC_CURRENT_OUT] = 4976, .R[PSC_CURRENT_OUT] = -1, .format[PSC_VOLTAGE_OUT] = linear, .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_INPUT, }, [max20734] = { .pages = 1, .read_word_data = max20730_read_word_data, .write_word_data = max20730_write_word_data, /* Source : Maxim AN6209 */ .format[PSC_TEMPERATURE] = direct, .m[PSC_TEMPERATURE] = 21, .b[PSC_TEMPERATURE] = 5887, .R[PSC_TEMPERATURE] = -1, .format[PSC_VOLTAGE_IN] = direct, .m[PSC_VOLTAGE_IN] = 3592, .b[PSC_VOLTAGE_IN] = 0, .R[PSC_VOLTAGE_IN] = -2, .format[PSC_CURRENT_OUT] = direct, .m[PSC_CURRENT_OUT] = 111, .b[PSC_CURRENT_OUT] = 3461, .R[PSC_CURRENT_OUT] = -1, .format[PSC_VOLTAGE_OUT] = linear, .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_INPUT, }, [max20743] = { .pages = 1, .read_word_data = max20730_read_word_data, .write_word_data = max20730_write_word_data, /* Source : Maxim AN6042 */ .format[PSC_TEMPERATURE] = direct, .m[PSC_TEMPERATURE] = 21, .b[PSC_TEMPERATURE] = 5887, .R[PSC_TEMPERATURE] = -1, .format[PSC_VOLTAGE_IN] = direct, .m[PSC_VOLTAGE_IN] = 3597, .b[PSC_VOLTAGE_IN] = 0, .R[PSC_VOLTAGE_IN] = -2, .format[PSC_CURRENT_OUT] = direct, .m[PSC_CURRENT_OUT] = 95, .b[PSC_CURRENT_OUT] = 5014, .R[PSC_CURRENT_OUT] = -1, .format[PSC_VOLTAGE_OUT] = linear, .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_INPUT, }, }; static int max20730_probe(struct i2c_client *client) { struct device *dev = &client->dev; u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; struct max20730_data *data; enum chips chip_id; int ret; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA | I2C_FUNC_SMBUS_READ_WORD_DATA | I2C_FUNC_SMBUS_BLOCK_DATA)) return -ENODEV; ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); if (ret < 0) { dev_err(&client->dev, "Failed to read Manufacturer ID\n"); return ret; } if (ret != 5 || strncmp(buf, "MAXIM", 5)) { buf[ret] = '\0'; dev_err(dev, "Unsupported Manufacturer ID '%s'\n", buf); return -ENODEV; } /* * The chips support reading PMBUS_MFR_MODEL. On both MAX20730 * and MAX20734, reading it returns M20743. Presumably that is * the reason why the command is not documented. Unfortunately, * that means that there is no reliable means to detect the chip. * However, we can at least detect the chip series. Compare * the returned value against 'M20743' and bail out if there is * a mismatch. If that doesn't work for all chips, we may have * to remove this check. */ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); if (ret < 0) { dev_err(dev, "Failed to read Manufacturer Model\n"); return ret; } if (ret != 6 || strncmp(buf, "M20743", 6)) { buf[ret] = '\0'; dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf); return -ENODEV; } ret = i2c_smbus_read_block_data(client, PMBUS_MFR_REVISION, buf); if (ret < 0) { dev_err(dev, "Failed to read Manufacturer Revision\n"); return ret; } if (ret != 1 || buf[0] != 'F') { buf[ret] = '\0'; dev_err(dev, "Unsupported Manufacturer Revision '%s'\n", buf); return -ENODEV; } if (client->dev.of_node) chip_id = (enum chips)of_device_get_match_data(dev); else chip_id = i2c_match_id(max20730_id, client)->driver_data; data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; data->id = chip_id; mutex_init(&data->lock); memcpy(&data->info, &max20730_info[chip_id], sizeof(data->info)); if (of_property_read_u32_array(client->dev.of_node, "vout-voltage-divider", data->vout_voltage_divider, ARRAY_SIZE(data->vout_voltage_divider)) != 0) memset(data->vout_voltage_divider, 0, sizeof(data->vout_voltage_divider)); if (data->vout_voltage_divider[1] < data->vout_voltage_divider[0]) { dev_err(dev, "The total resistance of voltage divider is less than output resistance\n"); return -EINVAL; } ret = i2c_smbus_read_word_data(client, MAX20730_MFR_DEVSET1); if (ret < 0) return ret; data->mfr_devset1 = ret; ret = pmbus_do_probe(client, &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[] = { { "max20710", max20710 }, { "max20730", max20730 }, { "max20734", max20734 }, { "max20743", max20743 }, { }, }; MODULE_DEVICE_TABLE(i2c, max20730_id); static const struct of_device_id max20730_of_match[] = { { .compatible = "maxim,max20710", .data = (void *)max20710 }, { .compatible = "maxim,max20730", .data = (void *)max20730 }, { .compatible = "maxim,max20734", .data = (void *)max20734 }, { .compatible = "maxim,max20743", .data = (void *)max20743 }, { }, }; MODULE_DEVICE_TABLE(of, max20730_of_match); static struct i2c_driver max20730_driver = { .driver = { .name = "max20730", .of_match_table = max20730_of_match, }, .probe_new = max20730_probe, .remove = pmbus_do_remove, .id_table = max20730_id, }; module_i2c_driver(max20730_driver); MODULE_AUTHOR("Guenter Roeck "); MODULE_DESCRIPTION("PMBus driver for Maxim MAX20710 / MAX20730 / MAX20734 / MAX20743"); MODULE_LICENSE("GPL");