--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for PIM4006, PIM4328 and PIM4820
+ *
+ * Copyright (c) 2021 Flextronics International Sweden AB
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+#include <linux/slab.h>
+#include "pmbus.h"
+
+enum chips { pim4006, pim4328, pim4820 };
+
+struct pim4328_data {
+ enum chips id;
+ struct pmbus_driver_info info;
+};
+
+#define to_pim4328_data(x) container_of(x, struct pim4328_data, info)
+
+/* PIM4006 and PIM4328 */
+#define PIM4328_MFR_READ_VINA 0xd3
+#define PIM4328_MFR_READ_VINB 0xd4
+
+/* PIM4006 */
+#define PIM4328_MFR_READ_IINA 0xd6
+#define PIM4328_MFR_READ_IINB 0xd7
+#define PIM4328_MFR_FET_CHECKSTATUS 0xd9
+
+/* PIM4328 */
+#define PIM4328_MFR_STATUS_BITS 0xd5
+
+/* PIM4820 */
+#define PIM4328_MFR_READ_STATUS 0xd0
+
+static const struct i2c_device_id pim4328_id[] = {
+ {"bmr455", pim4328},
+ {"pim4006", pim4006},
+ {"pim4106", pim4006},
+ {"pim4206", pim4006},
+ {"pim4306", pim4006},
+ {"pim4328", pim4328},
+ {"pim4406", pim4006},
+ {"pim4820", pim4820},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, pim4328_id);
+
+static int pim4328_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ int ret;
+
+ if (page > 0)
+ return -ENXIO;
+
+ if (phase == 0xff)
+ return -ENODATA;
+
+ switch (reg) {
+ case PMBUS_READ_VIN:
+ ret = pmbus_read_word_data(client, page, phase,
+ phase == 0 ? PIM4328_MFR_READ_VINA
+ : PIM4328_MFR_READ_VINB);
+ break;
+ case PMBUS_READ_IIN:
+ ret = pmbus_read_word_data(client, page, phase,
+ phase == 0 ? PIM4328_MFR_READ_IINA
+ : PIM4328_MFR_READ_IINB);
+ break;
+ default:
+ ret = -ENODATA;
+ }
+
+ return ret;
+}
+
+static int pim4328_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct pim4328_data *data = to_pim4328_data(info);
+ int ret, status;
+
+ if (page > 0)
+ return -ENXIO;
+
+ switch (reg) {
+ case PMBUS_STATUS_BYTE:
+ ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
+ if (ret < 0)
+ return ret;
+ if (data->id == pim4006) {
+ status = pmbus_read_word_data(client, page, 0xff,
+ PIM4328_MFR_FET_CHECKSTATUS);
+ if (status < 0)
+ return status;
+ if (status & 0x0630) /* Input UV */
+ ret |= PB_STATUS_VIN_UV;
+ } else if (data->id == pim4328) {
+ status = pmbus_read_byte_data(client, page,
+ PIM4328_MFR_STATUS_BITS);
+ if (status < 0)
+ return status;
+ if (status & 0x04) /* Input UV */
+ ret |= PB_STATUS_VIN_UV;
+ if (status & 0x40) /* Output UV */
+ ret |= PB_STATUS_NONE_ABOVE;
+ } else if (data->id == pim4820) {
+ status = pmbus_read_byte_data(client, page,
+ PIM4328_MFR_READ_STATUS);
+ if (status < 0)
+ return status;
+ if (status & 0x05) /* Input OV or OC */
+ ret |= PB_STATUS_NONE_ABOVE;
+ if (status & 0x1a) /* Input UV */
+ ret |= PB_STATUS_VIN_UV;
+ if (status & 0x40) /* OT */
+ ret |= PB_STATUS_TEMPERATURE;
+ }
+ break;
+ default:
+ ret = -ENODATA;
+ }
+
+ return ret;
+}
+
+static int pim4328_probe(struct i2c_client *client)
+{
+ int status;
+ u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
+ const struct i2c_device_id *mid;
+ struct pim4328_data *data;
+ struct pmbus_driver_info *info;
+ struct pmbus_platform_data *pdata;
+ struct device *dev = &client->dev;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_BYTE_DATA
+ | I2C_FUNC_SMBUS_BLOCK_DATA))
+ return -ENODEV;
+
+ data = devm_kzalloc(&client->dev, sizeof(struct pim4328_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ status = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, device_id);
+ if (status < 0) {
+ dev_err(&client->dev, "Failed to read Manufacturer Model\n");
+ return status;
+ }
+ for (mid = pim4328_id; mid->name[0]; mid++) {
+ if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
+ break;
+ }
+ if (!mid->name[0]) {
+ dev_err(&client->dev, "Unsupported device\n");
+ return -ENODEV;
+ }
+
+ if (strcmp(client->name, mid->name))
+ dev_notice(&client->dev,
+ "Device mismatch: Configured %s, detected %s\n",
+ client->name, mid->name);
+
+ data->id = mid->driver_data;
+ info = &data->info;
+ info->pages = 1;
+ info->read_byte_data = pim4328_read_byte_data;
+ info->read_word_data = pim4328_read_word_data;
+
+ pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+ dev->platform_data = pdata;
+ pdata->flags = PMBUS_NO_CAPABILITY | PMBUS_NO_WRITE_PROTECT;
+
+ switch (data->id) {
+ case pim4006:
+ info->phases[0] = 2;
+ info->func[0] = PMBUS_PHASE_VIRTUAL | PMBUS_HAVE_VIN
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT;
+ info->pfunc[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN;
+ info->pfunc[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN;
+ break;
+ case pim4328:
+ info->phases[0] = 2;
+ info->func[0] = PMBUS_PHASE_VIRTUAL
+ | PMBUS_HAVE_VCAP | PMBUS_HAVE_VIN
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT;
+ info->pfunc[0] = PMBUS_HAVE_VIN;
+ info->pfunc[1] = PMBUS_HAVE_VIN;
+ info->format[PSC_VOLTAGE_IN] = direct;
+ info->format[PSC_TEMPERATURE] = direct;
+ info->format[PSC_CURRENT_OUT] = direct;
+ pdata->flags |= PMBUS_USE_COEFFICIENTS_CMD;
+ break;
+ case pim4820:
+ info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_TEMP
+ | PMBUS_HAVE_IIN;
+ info->format[PSC_VOLTAGE_IN] = direct;
+ info->format[PSC_TEMPERATURE] = direct;
+ info->format[PSC_CURRENT_IN] = direct;
+ pdata->flags |= PMBUS_USE_COEFFICIENTS_CMD;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ return pmbus_do_probe(client, info);
+}
+
+static struct i2c_driver pim4328_driver = {
+ .driver = {
+ .name = "pim4328",
+ },
+ .probe_new = pim4328_probe,
+ .id_table = pim4328_id,
+};
+
+module_i2c_driver(pim4328_driver);
+
+MODULE_AUTHOR("Erik Rosen <erik.rosen@metormote.com>");
+MODULE_DESCRIPTION("PMBus driver for PIM4006, PIM4328, PIM4820 power interface modules");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);
projects / linux.git / commitdiff