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206 lines
4.8 KiB
206 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Driver for Delta DPS920AB PSU |
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* |
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* Copyright (C) 2021 Delta Networks, Inc. |
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* Copyright (C) 2021 Sartura Ltd. |
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*/ |
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#include <linux/debugfs.h> |
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#include <linux/i2c.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include "pmbus.h" |
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struct dps920ab_data { |
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char *mfr_model; |
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char *mfr_id; |
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}; |
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static int dps920ab_read_word_data(struct i2c_client *client, int page, int phase, int reg) |
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{ |
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/* |
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* This masks commands which are not supported. |
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* PSU advertises that all features are supported, |
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* in reality that unfortunately is not true. |
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* So enable only those that the datasheet confirms. |
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*/ |
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switch (reg) { |
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case PMBUS_FAN_COMMAND_1: |
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case PMBUS_IOUT_OC_WARN_LIMIT: |
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case PMBUS_STATUS_WORD: |
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case PMBUS_READ_VIN: |
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case PMBUS_READ_IIN: |
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case PMBUS_READ_VOUT: |
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case PMBUS_READ_IOUT: |
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case PMBUS_READ_TEMPERATURE_1: |
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case PMBUS_READ_TEMPERATURE_2: |
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case PMBUS_READ_TEMPERATURE_3: |
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case PMBUS_READ_FAN_SPEED_1: |
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case PMBUS_READ_POUT: |
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case PMBUS_READ_PIN: |
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case PMBUS_MFR_VOUT_MIN: |
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case PMBUS_MFR_VOUT_MAX: |
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case PMBUS_MFR_IOUT_MAX: |
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case PMBUS_MFR_POUT_MAX: |
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return pmbus_read_word_data(client, page, phase, reg); |
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default: |
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return -ENXIO; |
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} |
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} |
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static int dps920ab_write_word_data(struct i2c_client *client, int page, int reg, |
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u16 word) |
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{ |
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/* |
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* This masks commands which are not supported. |
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* PSU only has one R/W register and that is |
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* for the fan. |
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*/ |
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switch (reg) { |
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case PMBUS_FAN_COMMAND_1: |
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return pmbus_write_word_data(client, page, reg, word); |
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default: |
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return -EACCES; |
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} |
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} |
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static struct pmbus_driver_info dps920ab_info = { |
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.pages = 1, |
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.format[PSC_VOLTAGE_IN] = linear, |
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.format[PSC_VOLTAGE_OUT] = linear, |
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.format[PSC_CURRENT_IN] = linear, |
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.format[PSC_CURRENT_OUT] = linear, |
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.format[PSC_POWER] = linear, |
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.format[PSC_FAN] = linear, |
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.format[PSC_TEMPERATURE] = linear, |
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.func[0] = |
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PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | |
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PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | |
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PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | |
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PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 | |
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PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | |
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PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, |
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.read_word_data = dps920ab_read_word_data, |
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.write_word_data = dps920ab_write_word_data, |
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}; |
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static int dps920ab_mfr_id_show(struct seq_file *s, void *data) |
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{ |
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struct dps920ab_data *priv = s->private; |
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seq_printf(s, "%s\n", priv->mfr_id); |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(dps920ab_mfr_id); |
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static int dps920ab_mfr_model_show(struct seq_file *s, void *data) |
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{ |
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struct dps920ab_data *priv = s->private; |
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seq_printf(s, "%s\n", priv->mfr_model); |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(dps920ab_mfr_model); |
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static void dps920ab_init_debugfs(struct dps920ab_data *data, struct i2c_client *client) |
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{ |
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struct dentry *debugfs_dir; |
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struct dentry *root; |
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root = pmbus_get_debugfs_dir(client); |
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if (!root) |
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return; |
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debugfs_dir = debugfs_create_dir(client->name, root); |
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debugfs_create_file("mfr_id", |
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0400, |
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debugfs_dir, |
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data, |
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&dps920ab_mfr_id_fops); |
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debugfs_create_file("mfr_model", |
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0400, |
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debugfs_dir, |
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data, |
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&dps920ab_mfr_model_fops); |
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} |
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static int dps920ab_probe(struct i2c_client *client) |
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{ |
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u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; |
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struct dps920ab_data *data; |
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int ret; |
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data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); |
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if (ret < 0) { |
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dev_err(&client->dev, "Failed to read Manufacturer ID\n"); |
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return ret; |
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} |
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buf[ret] = '\0'; |
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if (ret != 5 || strncmp(buf, "DELTA", 5)) { |
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buf[ret] = '\0'; |
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dev_err(&client->dev, "Unsupported Manufacturer ID '%s'\n", buf); |
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return -ENODEV; |
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} |
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data->mfr_id = devm_kstrdup(&client->dev, buf, GFP_KERNEL); |
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if (!data->mfr_id) |
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return -ENOMEM; |
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); |
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if (ret < 0) { |
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dev_err(&client->dev, "Failed to read Manufacturer Model\n"); |
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return ret; |
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} |
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buf[ret] = '\0'; |
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if (ret != 11 || strncmp(buf, "DPS-920AB", 9)) { |
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dev_err(&client->dev, "Unsupported Manufacturer Model '%s'\n", buf); |
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return -ENODEV; |
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} |
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data->mfr_model = devm_kstrdup(&client->dev, buf, GFP_KERNEL); |
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if (!data->mfr_model) |
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return -ENOMEM; |
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ret = pmbus_do_probe(client, &dps920ab_info); |
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if (ret) |
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return ret; |
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dps920ab_init_debugfs(data, client); |
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return 0; |
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} |
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static const struct of_device_id __maybe_unused dps920ab_of_match[] = { |
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{ .compatible = "delta,dps920ab", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, dps920ab_of_match); |
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static struct i2c_driver dps920ab_driver = { |
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.driver = { |
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.name = "dps920ab", |
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.of_match_table = of_match_ptr(dps920ab_of_match), |
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}, |
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.probe_new = dps920ab_probe, |
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}; |
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module_i2c_driver(dps920ab_driver); |
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MODULE_AUTHOR("Robert Marko <[email protected]>"); |
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MODULE_DESCRIPTION("PMBus driver for Delta DPS920AB PSU"); |
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MODULE_LICENSE("GPL"); |
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MODULE_IMPORT_NS(PMBUS);
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