hwmon: (pmbus) Add support for Analog Devices ADM1275

[pandora-kernel.git] / drivers / hwmon / adm1275.c

diff --git a/drivers/hwmon/adm1275.c b/drivers/hwmon/adm1275.c
new file mode 100644 (file)
index 0000000..c2ee204
--- /dev/null
+++ b/drivers/hwmon/adm1275.c
@@ -0,0 +1,121 @@
+/*
+ * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
+ * and Digital Power Monitor
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+#define ADM1275_PMON_CONFIG            0xd4
+
+#define ADM1275_VIN_VOUT_SELECT                (1 << 6)
+#define ADM1275_VRANGE                 (1 << 5)
+
+static int adm1275_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       int config;
+       struct pmbus_driver_info *info;
+
+       if (!i2c_check_functionality(client->adapter,
+                                    I2C_FUNC_SMBUS_READ_BYTE_DATA))
+               return -ENODEV;
+
+       info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
+       if (!info)
+               return -ENOMEM;
+
+       config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
+       if (config < 0)
+               return config;
+
+       info->pages = 1;
+       info->direct[PSC_VOLTAGE_IN] = true;
+       info->direct[PSC_VOLTAGE_OUT] = true;
+       info->direct[PSC_CURRENT_OUT] = true;
+       info->m[PSC_CURRENT_OUT] = 800;
+       info->b[PSC_CURRENT_OUT] = 20475;
+       info->R[PSC_CURRENT_OUT] = -1;
+       info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
+
+       if (config & ADM1275_VRANGE) {
+               info->m[PSC_VOLTAGE_IN] = 19045;
+               info->b[PSC_VOLTAGE_IN] = 0;
+               info->R[PSC_VOLTAGE_IN] = -2;
+               info->m[PSC_VOLTAGE_OUT] = 19045;
+               info->b[PSC_VOLTAGE_OUT] = 0;
+               info->R[PSC_VOLTAGE_OUT] = -2;
+       } else {
+               info->m[PSC_VOLTAGE_IN] = 6666;
+               info->b[PSC_VOLTAGE_IN] = 0;
+               info->R[PSC_VOLTAGE_IN] = -1;
+               info->m[PSC_VOLTAGE_OUT] = 6666;
+               info->b[PSC_VOLTAGE_OUT] = 0;
+               info->R[PSC_VOLTAGE_OUT] = -1;
+       }
+
+       if (config & ADM1275_VIN_VOUT_SELECT)
+               info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
+       else
+               info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
+
+       return pmbus_do_probe(client, id, info);
+}
+
+static int adm1275_remove(struct i2c_client *client)
+{
+       const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+       int ret;
+
+       ret = pmbus_do_remove(client);
+       kfree(info);
+       return ret;
+}
+
+static const struct i2c_device_id adm1275_id[] = {
+       {"adm1275", 0},
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, adm1275_id);
+
+static struct i2c_driver adm1275_driver = {
+       .driver = {
+                  .name = "adm1275",
+                  },
+       .probe = adm1275_probe,
+       .remove = adm1275_remove,
+       .id_table = adm1275_id,
+};
+
+static int __init adm1275_init(void)
+{
+       return i2c_add_driver(&adm1275_driver);
+}
+
+static void __exit adm1275_exit(void)
+{
+       i2c_del_driver(&adm1275_driver);
+}
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
+MODULE_LICENSE("GPL");
+module_init(adm1275_init);
+module_exit(adm1275_exit);