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Diffstat (limited to 'drivers/hwmon/atxp1.c')
-rw-r--r--drivers/hwmon/atxp1.c295
1 files changed, 295 insertions, 0 deletions
diff --git a/drivers/hwmon/atxp1.c b/drivers/hwmon/atxp1.c
new file mode 100644
index 0000000000..d1de020abe
--- /dev/null
+++ b/drivers/hwmon/atxp1.c
@@ -0,0 +1,295 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * atxp1.c - kernel module for setting CPU VID and general purpose
+ * I/Os using the Attansic ATXP1 chip.
+ *
+ * The ATXP1 can reside on I2C addresses 0x37 or 0x4e. The chip is
+ * not auto-detected by the driver and must be instantiated explicitly.
+ * See Documentation/i2c/instantiating-devices.rst for more information.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-vid.h>
+#include <linux/err.h>
+#include <linux/kstrtox.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+#include <linux/slab.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
+MODULE_VERSION("0.6.3");
+MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");
+
+#define ATXP1_VID 0x00
+#define ATXP1_CVID 0x01
+#define ATXP1_GPIO1 0x06
+#define ATXP1_GPIO2 0x0a
+#define ATXP1_VIDENA 0x20
+#define ATXP1_VIDMASK 0x1f
+#define ATXP1_GPIO1MASK 0x0f
+
+struct atxp1_data {
+ struct i2c_client *client;
+ struct mutex update_lock;
+ unsigned long last_updated;
+ bool valid;
+ struct {
+ u8 vid; /* VID output register */
+ u8 cpu_vid; /* VID input from CPU */
+ u8 gpio1; /* General purpose I/O register 1 */
+ u8 gpio2; /* General purpose I/O register 2 */
+ } reg;
+ u8 vrm; /* Detected CPU VRM */
+};
+
+static struct atxp1_data *atxp1_update_device(struct device *dev)
+{
+ struct atxp1_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+
+ /* Update local register data */
+ data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
+ data->reg.cpu_vid = i2c_smbus_read_byte_data(client,
+ ATXP1_CVID);
+ data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
+ data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);
+
+ data->valid = true;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
+}
+
+/* sys file functions for cpu0_vid */
+static ssize_t cpu0_vid_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int size;
+ struct atxp1_data *data;
+
+ data = atxp1_update_device(dev);
+
+ size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK,
+ data->vrm));
+
+ return size;
+}
+
+static ssize_t cpu0_vid_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct atxp1_data *data = atxp1_update_device(dev);
+ struct i2c_client *client = data->client;
+ int vid, cvid;
+ unsigned long vcore;
+ int err;
+
+ err = kstrtoul(buf, 10, &vcore);
+ if (err)
+ return err;
+
+ vcore /= 25;
+ vcore *= 25;
+
+ /* Calculate VID */
+ vid = vid_to_reg(vcore, data->vrm);
+ if (vid < 0) {
+ dev_err(dev, "VID calculation failed.\n");
+ return vid;
+ }
+
+ /*
+ * If output enabled, use control register value.
+ * Otherwise original CPU VID
+ */
+ if (data->reg.vid & ATXP1_VIDENA)
+ cvid = data->reg.vid & ATXP1_VIDMASK;
+ else
+ cvid = data->reg.cpu_vid;
+
+ /* Nothing changed, aborting */
+ if (vid == cvid)
+ return count;
+
+ dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid);
+
+ /* Write every 25 mV step to increase stability */
+ if (cvid > vid) {
+ for (; cvid >= vid; cvid--)
+ i2c_smbus_write_byte_data(client,
+ ATXP1_VID, cvid | ATXP1_VIDENA);
+ } else {
+ for (; cvid <= vid; cvid++)
+ i2c_smbus_write_byte_data(client,
+ ATXP1_VID, cvid | ATXP1_VIDENA);
+ }
+
+ data->valid = false;
+
+ return count;
+}
+
+/*
+ * CPU core reference voltage
+ * unit: millivolt
+ */
+static DEVICE_ATTR_RW(cpu0_vid);
+
+/* sys file functions for GPIO1 */
+static ssize_t gpio1_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int size;
+ struct atxp1_data *data;
+
+ data = atxp1_update_device(dev);
+
+ size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);
+
+ return size;
+}
+
+static ssize_t gpio1_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct atxp1_data *data = atxp1_update_device(dev);
+ struct i2c_client *client = data->client;
+ unsigned long value;
+ int err;
+
+ err = kstrtoul(buf, 16, &value);
+ if (err)
+ return err;
+
+ value &= ATXP1_GPIO1MASK;
+
+ if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
+ dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value);
+
+ i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);
+
+ data->valid = false;
+ }
+
+ return count;
+}
+
+/*
+ * GPIO1 data register
+ * unit: Four bit as hex (e.g. 0x0f)
+ */
+static DEVICE_ATTR_RW(gpio1);
+
+/* sys file functions for GPIO2 */
+static ssize_t gpio2_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int size;
+ struct atxp1_data *data;
+
+ data = atxp1_update_device(dev);
+
+ size = sprintf(buf, "0x%02x\n", data->reg.gpio2);
+
+ return size;
+}
+
+static ssize_t gpio2_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct atxp1_data *data = atxp1_update_device(dev);
+ struct i2c_client *client = data->client;
+ unsigned long value;
+ int err;
+
+ err = kstrtoul(buf, 16, &value);
+ if (err)
+ return err;
+ value &= 0xff;
+
+ if (value != data->reg.gpio2) {
+ dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value);
+
+ i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);
+
+ data->valid = false;
+ }
+
+ return count;
+}
+
+/*
+ * GPIO2 data register
+ * unit: Eight bit as hex (e.g. 0xff)
+ */
+static DEVICE_ATTR_RW(gpio2);
+
+static struct attribute *atxp1_attrs[] = {
+ &dev_attr_gpio1.attr,
+ &dev_attr_gpio2.attr,
+ &dev_attr_cpu0_vid.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(atxp1);
+
+static int atxp1_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct atxp1_data *data;
+ struct device *hwmon_dev;
+
+ data = devm_kzalloc(dev, sizeof(struct atxp1_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* Get VRM */
+ data->vrm = vid_which_vrm();
+ if (data->vrm != 90 && data->vrm != 91) {
+ dev_err(dev, "atxp1: Not supporting VRM %d.%d\n",
+ data->vrm / 10, data->vrm % 10);
+ return -ENODEV;
+ }
+
+ data->client = client;
+ mutex_init(&data->update_lock);
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+ data,
+ atxp1_groups);
+ if (IS_ERR(hwmon_dev))
+ return PTR_ERR(hwmon_dev);
+
+ dev_info(dev, "Using VRM: %d.%d\n", data->vrm / 10, data->vrm % 10);
+
+ return 0;
+};
+
+static const struct i2c_device_id atxp1_id[] = {
+ { "atxp1", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, atxp1_id);
+
+static struct i2c_driver atxp1_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "atxp1",
+ },
+ .probe = atxp1_probe,
+ .id_table = atxp1_id,
+};
+
+module_i2c_driver(atxp1_driver);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 06:45:24 +0000