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path: root/drivers/hwmon/pmbus/max34440.c
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-rw-r--r--drivers/hwmon/pmbus/max34440.c262
1 files changed, 262 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/max34440.c b/drivers/hwmon/pmbus/max34440.c
new file mode 100644
index 000000000000..fda621d2e458
--- /dev/null
+++ b/drivers/hwmon/pmbus/max34440.c
@@ -0,0 +1,262 @@
+/*
+ * Hardware monitoring driver for Maxim MAX34440/MAX34441
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+enum chips { max34440, max34441 };
+
+#define MAX34440_MFR_VOUT_PEAK 0xd4
+#define MAX34440_MFR_IOUT_PEAK 0xd5
+#define MAX34440_MFR_TEMPERATURE_PEAK 0xd6
+
+#define MAX34440_STATUS_OC_WARN (1 << 0)
+#define MAX34440_STATUS_OC_FAULT (1 << 1)
+#define MAX34440_STATUS_OT_FAULT (1 << 5)
+#define MAX34440_STATUS_OT_WARN (1 << 6)
+
+static int max34440_read_word_data(struct i2c_client *client, int page, int reg)
+{
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_VOUT_MAX:
+ ret = pmbus_read_word_data(client, page,
+ MAX34440_MFR_VOUT_PEAK);
+ break;
+ case PMBUS_VIRT_READ_IOUT_MAX:
+ ret = pmbus_read_word_data(client, page,
+ MAX34440_MFR_IOUT_PEAK);
+ break;
+ case PMBUS_VIRT_READ_TEMP_MAX:
+ ret = pmbus_read_word_data(client, page,
+ MAX34440_MFR_TEMPERATURE_PEAK);
+ break;
+ case PMBUS_VIRT_RESET_VOUT_HISTORY:
+ case PMBUS_VIRT_RESET_IOUT_HISTORY:
+ case PMBUS_VIRT_RESET_TEMP_HISTORY:
+ ret = 0;
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
+static int max34440_write_word_data(struct i2c_client *client, int page,
+ int reg, u16 word)
+{
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_RESET_VOUT_HISTORY:
+ ret = pmbus_write_word_data(client, page,
+ MAX34440_MFR_VOUT_PEAK, 0);
+ break;
+ case PMBUS_VIRT_RESET_IOUT_HISTORY:
+ ret = pmbus_write_word_data(client, page,
+ MAX34440_MFR_IOUT_PEAK, 0);
+ break;
+ case PMBUS_VIRT_RESET_TEMP_HISTORY:
+ ret = pmbus_write_word_data(client, page,
+ MAX34440_MFR_TEMPERATURE_PEAK,
+ 0xffff);
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
+static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ int ret;
+ int mfg_status;
+
+ ret = pmbus_set_page(client, page);
+ if (ret < 0)
+ return ret;
+
+ switch (reg) {
+ case PMBUS_STATUS_IOUT:
+ mfg_status = pmbus_read_word_data(client, 0,
+ PMBUS_STATUS_MFR_SPECIFIC);
+ if (mfg_status < 0)
+ return mfg_status;
+ if (mfg_status & MAX34440_STATUS_OC_WARN)
+ ret |= PB_IOUT_OC_WARNING;
+ if (mfg_status & MAX34440_STATUS_OC_FAULT)
+ ret |= PB_IOUT_OC_FAULT;
+ break;
+ case PMBUS_STATUS_TEMPERATURE:
+ mfg_status = pmbus_read_word_data(client, 0,
+ PMBUS_STATUS_MFR_SPECIFIC);
+ if (mfg_status < 0)
+ return mfg_status;
+ if (mfg_status & MAX34440_STATUS_OT_WARN)
+ ret |= PB_TEMP_OT_WARNING;
+ if (mfg_status & MAX34440_STATUS_OT_FAULT)
+ ret |= PB_TEMP_OT_FAULT;
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
+static struct pmbus_driver_info max34440_info[] = {
+ [max34440] = {
+ .pages = 14,
+ .format[PSC_VOLTAGE_IN] = direct,
+ .format[PSC_VOLTAGE_OUT] = direct,
+ .format[PSC_TEMPERATURE] = direct,
+ .format[PSC_CURRENT_OUT] = direct,
+ .m[PSC_VOLTAGE_IN] = 1,
+ .b[PSC_VOLTAGE_IN] = 0,
+ .R[PSC_VOLTAGE_IN] = 3, /* R = 0 in datasheet reflects mV */
+ .m[PSC_VOLTAGE_OUT] = 1,
+ .b[PSC_VOLTAGE_OUT] = 0,
+ .R[PSC_VOLTAGE_OUT] = 3, /* R = 0 in datasheet reflects mV */
+ .m[PSC_CURRENT_OUT] = 1,
+ .b[PSC_CURRENT_OUT] = 0,
+ .R[PSC_CURRENT_OUT] = 3, /* R = 0 in datasheet reflects mA */
+ .m[PSC_TEMPERATURE] = 1,
+ .b[PSC_TEMPERATURE] = 0,
+ .R[PSC_TEMPERATURE] = 2,
+ .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .read_byte_data = max34440_read_byte_data,
+ .read_word_data = max34440_read_word_data,
+ .write_word_data = max34440_write_word_data,
+ },
+ [max34441] = {
+ .pages = 12,
+ .format[PSC_VOLTAGE_IN] = direct,
+ .format[PSC_VOLTAGE_OUT] = direct,
+ .format[PSC_TEMPERATURE] = direct,
+ .format[PSC_CURRENT_OUT] = direct,
+ .format[PSC_FAN] = direct,
+ .m[PSC_VOLTAGE_IN] = 1,
+ .b[PSC_VOLTAGE_IN] = 0,
+ .R[PSC_VOLTAGE_IN] = 3,
+ .m[PSC_VOLTAGE_OUT] = 1,
+ .b[PSC_VOLTAGE_OUT] = 0,
+ .R[PSC_VOLTAGE_OUT] = 3,
+ .m[PSC_CURRENT_OUT] = 1,
+ .b[PSC_CURRENT_OUT] = 0,
+ .R[PSC_CURRENT_OUT] = 3,
+ .m[PSC_TEMPERATURE] = 1,
+ .b[PSC_TEMPERATURE] = 0,
+ .R[PSC_TEMPERATURE] = 2,
+ .m[PSC_FAN] = 1,
+ .b[PSC_FAN] = 0,
+ .R[PSC_FAN] = 0,
+ .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+ .func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
+ .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .read_byte_data = max34440_read_byte_data,
+ .read_word_data = max34440_read_word_data,
+ .write_word_data = max34440_write_word_data,
+ },
+};
+
+static int max34440_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ return pmbus_do_probe(client, id, &max34440_info[id->driver_data]);
+}
+
+static int max34440_remove(struct i2c_client *client)
+{
+ return pmbus_do_remove(client);
+}
+
+static const struct i2c_device_id max34440_id[] = {
+ {"max34440", max34440},
+ {"max34441", max34441},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, max34440_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver max34440_driver = {
+ .driver = {
+ .name = "max34440",
+ },
+ .probe = max34440_probe,
+ .remove = max34440_remove,
+ .id_table = max34440_id,
+};
+
+static int __init max34440_init(void)
+{
+ return i2c_add_driver(&max34440_driver);
+}
+
+static void __exit max34440_exit(void)
+{
+ i2c_del_driver(&max34440_driver);
+}
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
+MODULE_LICENSE("GPL");
+module_init(max34440_init);
+module_exit(max34440_exit);