Added missing tegra files.HEADmaster

1 files changed, 414 insertions, 0 deletions

diff --git a/drivers/hwmon/ina219.c b/drivers/hwmon/ina219.c
new file mode 100644
index 00000000000..cc5b85fdcf8
--- /dev/null
+++ b/drivers/hwmon/ina219.c
@@ -0,0 +1,414 @@
+/*
+ * ina219.c - driver for TI INA219 current / power monitor sensor
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ *
+ * The INA219 is a sensor chip made by Texas Instruments. It measures
+ * power, voltage and current on a power rail.
+ * Complete datasheet can be obtained from website:
+ *   http://focus.ti.com/lit/ds/symlink/ina219.pdf
+ *
+ * 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.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/sysfs.h>
+#include <linux/kobject.h>
+#include <linux/hrtimer.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/device.h>
+#include <linux/sysdev.h>
+#include "linux/ina219.h"
+#include <linux/init.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon.h>
+
+#define DRIVER_NAME "ina219"
+
+/* INA219 register offsets */
+#define INA219_CONFIG   0
+#define INA219_SHUNT    1
+#define INA219_VOLTAGE  2
+#define INA219_POWER    3
+#define INA219_CURRENT  4
+#define INA219_CAL      5
+
+/*
+        INA219 Sensor defines
+        Config info for ina219s
+        D15   D14  D13  D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
+        rst  BRNG  PG1 PG0  BADC4 .-.BADC1 SADC4 - SADC1 MODE3 - MODE1
+        reset D15
+        bus_range=0 (d13)
+        pga_gain=0  (D12:D11)
+        bus_adc_setting=0x3     (d10:D7) 12-bit w/o oversampling (532uS)
+        shunt_adc_setting=0xb    (D6:D3) 8x oversampling (4.26ms)
+        mode=0x7                 (D2:D0) continuous shunt & bus
+*/
+#define INA219_CONFIG_DATA 0x1df
+#define INA219_RESET 0x8000
+
+struct power_mon_data {
+        s32 voltage;
+        s32 currentInMillis;
+        s32 power;
+};
+
+struct ina219_data {
+        struct device *hwmon_dev;
+        struct i2c_client *client;
+        struct ina219_platform_data *pInfo;
+        struct power_mon_data pm_data;
+        struct mutex mutex;
+};
+
+/* Set non-zero to enable debug prints */
+#define INA219_DEBUG_PRINTS 0
+
+#if INA219_DEBUG_PRINTS
+#define DEBUG_INA219(x) printk x
+#else
+#define DEBUG_INA219(x)
+#endif
+
+static s16 reorder_bytes(s16 a)
+{
+        s16 ret = ((a >> 8) & 0xff) | ((a & 0xff) << 8);
+        return ret;
+}
+
+/* set ina219 to power down mode */
+static s32 power_down_INA219(struct i2c_client *client)
+{
+        s32 retval;
+        retval = i2c_smbus_write_word_data(client, INA219_CONFIG, 0);
+        if (retval < 0)
+                dev_err(&client->dev, "power down failure sts: 0x%x\n", retval);
+        return retval;
+}
+
+static s32 show_rail_name(struct device *dev,
+                        struct device_attribute *attr,
+                        char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct ina219_data *data = i2c_get_clientdata(client);
+        return sprintf(buf, "%s\n", data->pInfo->rail_name);
+}
+
+static s32 show_voltage(struct device *dev,
+                        struct device_attribute *attr,
+                        char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct ina219_data *data = i2c_get_clientdata(client);
+        s32 retval;
+        s32 voltage_mV;
+
+        /* fill config data */
+        retval = i2c_smbus_write_word_data(client, INA219_CONFIG,
+                reorder_bytes(INA219_CONFIG_DATA));
+        if (retval < 0) {
+                dev_err(dev, "config data write failed sts: 0x%x\n", retval);
+                goto error;
+        }
+
+        /* fill calibration data */
+        retval = i2c_smbus_write_word_data(client, INA219_CAL,
+                reorder_bytes(data->pInfo->calibration_data));
+        if (retval < 0) {
+                dev_err(dev, "calib data write failed sts: 0x%x\n", retval);
+                goto error;
+        }
+
+        /* getting voltage readings in milli volts*/
+        voltage_mV =
+                reorder_bytes(i2c_smbus_read_word_data(client,
+                        INA219_VOLTAGE));
+        DEBUG_INA219(("Ina219 voltage reg Value: 0x%x\n", voltage_mV));
+        if (voltage_mV < 0)
+                goto error;
+        voltage_mV = voltage_mV >> 1;
+        DEBUG_INA219(("Ina219 voltage in mv: %d\n", voltage_mV));
+
+        /* set ina219 to power down mode */
+        retval = power_down_INA219(client);
+        if (retval < 0)
+                goto error;
+
+        DEBUG_INA219(("%s volt = %d\n", __func__, voltage_mV));
+        return sprintf(buf, "%d mV\n", voltage_mV);
+error:
+        dev_err(dev, "%s: failed\n", __func__);
+        return retval;
+}
+
+
+static s32 show_power(struct device *dev,
+                        struct device_attribute *attr,
+                        char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct ina219_data *data = i2c_get_clientdata(client);
+        s32 retval;
+        s32 power_mW;
+        s32 voltage_mV;
+        s32 overflow, conversion;
+
+        /* fill config data */
+        retval = i2c_smbus_write_word_data(client, INA219_CONFIG,
+                reorder_bytes(INA219_CONFIG_DATA));
+        if (retval < 0) {
+                dev_err(dev, "config data write failed sts: 0x%x\n", retval);
+                goto error;
+        }
+
+        /* fill calib data */
+        retval = i2c_smbus_write_word_data(client, INA219_CAL,
+                reorder_bytes(data->pInfo->calibration_data));
+        if (retval < 0) {
+                dev_err(dev, "calibration data write failed sts: 0x%x\n",
+                        retval);
+                goto error;
+        }
+
+        /* check if the readings are valid */
+        do {
+                /* read power register to clear conversion bit */
+                retval = reorder_bytes(i2c_smbus_read_word_data(client,
+                        INA219_POWER));
+                if (retval < 0) {
+                        dev_err(dev, "CNVR bit clearing failure sts: 0x%x\n",
+                                retval);
+                        goto error;
+                }
+
+                voltage_mV =
+                        reorder_bytes(i2c_smbus_read_word_data(client,
+                                INA219_VOLTAGE));
+                DEBUG_INA219(("Ina219 voltage reg Value: 0x%x\n", voltage_mV));
+                overflow = voltage_mV & 1;
+                if (overflow) {
+                        dev_err(dev, "overflow error\n");
+                        return 0;
+                }
+                conversion = (voltage_mV >> 1) & 1;
+                DEBUG_INA219(("\n ina219 CNVR value:%d", conversion));
+        } while (!conversion);
+
+        /* getting power readings in milli watts*/
+        power_mW = reorder_bytes(i2c_smbus_read_word_data(client,
+                INA219_POWER));
+        DEBUG_INA219(("Ina219 power Reg: 0x%x\n", power_mW));
+        power_mW *= data->pInfo->power_lsb;
+        DEBUG_INA219(("Ina219 power Val: %d\n", power_mW));
+        if (power_mW < 0)
+                goto error;
+
+        /* set ina219 to power down mode */
+        retval = power_down_INA219(client);
+        if (retval < 0)
+                goto error;
+
+        DEBUG_INA219(("%s pow = %d\n", __func__, power_mW));
+        return sprintf(buf, "%d mW\n", power_mW);
+error:
+        dev_err(dev, "%s: failed\n", __func__);
+        return retval;
+}
+
+static s32 show_current(struct device *dev,
+                        struct device_attribute *attr,
+                        char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct ina219_data *data = i2c_get_clientdata(client);
+        s32 retval;
+        s32 current_mA;
+        s32 voltage_mV;
+        s32 overflow, conversion;
+
+        /* fill config data */
+        retval = i2c_smbus_write_word_data(client, INA219_CONFIG,
+                reorder_bytes(INA219_CONFIG_DATA));
+        if (retval < 0) {
+                dev_err(dev, "config data write failed sts: 0x%x\n", retval);
+                goto error;
+        }
+
+        /* fill calib data */
+        retval = i2c_smbus_write_word_data(client, INA219_CAL,
+                reorder_bytes(data->pInfo->calibration_data));
+        if (retval < 0) {
+                dev_err(dev, "calibration data write failed sts: 0x%x\n",
+                        retval);
+                goto error;
+        }
+
+        /* check if the readings are valid */
+        do {
+                /* read power register to clear conversion bit */
+                retval = reorder_bytes(i2c_smbus_read_word_data(client,
+                        INA219_POWER));
+                if (retval < 0) {
+                        dev_err(dev, "CNVR bit clearing failure sts: 0x%x\n",
+                                retval);
+                        goto error;
+                }
+
+                voltage_mV =
+                        reorder_bytes(i2c_smbus_read_word_data(client,
+                                INA219_VOLTAGE));
+                DEBUG_INA219(("Ina219 voltage reg Value: 0x%x\n", voltage_mV));
+                overflow = voltage_mV & 1;
+                if (overflow) {
+                        dev_err(dev, "overflow error\n");
+                        return 0;
+                }
+                conversion = (voltage_mV >> 1) & 1;
+                DEBUG_INA219(("\n ina219 CNVR value:%d", conversion));
+        } while (!conversion);
+
+        /* getting current readings in milli amps*/
+        current_mA = reorder_bytes(i2c_smbus_read_word_data(client,
+                INA219_CURRENT));
+        DEBUG_INA219(("Ina219 current Reg: 0x%x\n", current_mA));
+        if (current_mA < 0)
+                goto error;
+        current_mA =
+                (current_mA * data->pInfo->power_lsb) / data->pInfo->divisor;
+        DEBUG_INA219(("Ina219 current Value: %d\n", current_mA));
+
+        /* set ina219 to power down mode */
+        retval = power_down_INA219(client);
+        if (retval < 0)
+                goto error;
+
+
+        DEBUG_INA219(("%s current = %d\n", __func__, current_mA));
+        return sprintf(buf, "%d mA\n", current_mA);
+error:
+        dev_err(dev, "%s: failed\n", __func__);
+        return retval;
+}
+
+static struct sensor_device_attribute ina219[] = {
+        SENSOR_ATTR(rail_name, S_IRUGO, show_rail_name, NULL, 0),
+        SENSOR_ATTR(in1_input, S_IRUGO, show_voltage, NULL, 0),
+        SENSOR_ATTR(curr1_input, S_IRUGO, show_current, NULL, 0),
+        SENSOR_ATTR(power1_input, S_IRUGO, show_power, NULL, 0),
+};
+
+static int __devinit ina219_probe(struct i2c_client *client,
+                                const struct i2c_device_id *id)
+{
+        struct ina219_data *data;
+        int err;
+        u8 i;
+        data = kzalloc(sizeof(struct ina219_data), GFP_KERNEL);
+        if (!data) {
+                err = -ENOMEM;
+                goto exit;
+        }
+
+        i2c_set_clientdata(client, data);
+        data->pInfo = client->dev.platform_data;
+        mutex_init(&data->mutex);
+        /* reset ina219 */
+        err = i2c_smbus_write_word_data(client, INA219_CONFIG,
+                reorder_bytes(INA219_RESET));
+        if (err < 0) {
+                dev_err(&client->dev, "ina219 reset failure status: 0x%x\n",
+                        err);
+                goto exit_free;
+        }
+
+        for (i = 0; i < ARRAY_SIZE(ina219); i++) {
+                err = device_create_file(&client->dev, &ina219[i].dev_attr);
+                if (err) {
+                        dev_err(&client->dev, "device_create_file failed.\n");
+                        goto exit_free;
+                }
+        }
+
+        data->hwmon_dev = hwmon_device_register(&client->dev);
+        if (IS_ERR(data->hwmon_dev)) {
+                err = PTR_ERR(data->hwmon_dev);
+                goto exit_remove;
+        }
+
+        /* set ina219 to power down mode */
+        err = power_down_INA219(client);
+        if (err < 0)
+                goto exit_remove;
+
+        return 0;
+
+exit_remove:
+        for (i = 0; i < ARRAY_SIZE(ina219); i++)
+                device_remove_file(&client->dev, &ina219[i].dev_attr);
+exit_free:
+        kfree(data);
+exit:
+        return err;
+}
+
+static int __devexit ina219_remove(struct i2c_client *client)
+{
+        u8 i;
+        struct ina219_data *data = i2c_get_clientdata(client);
+        hwmon_device_unregister(data->hwmon_dev);
+        for (i = 0; i < ARRAY_SIZE(ina219); i++)
+                device_remove_file(&client->dev, &ina219[i].dev_attr);
+        kfree(data);
+        return 0;
+}
+
+static const struct i2c_device_id ina219_id[] = {
+        {DRIVER_NAME, 0 },
+        {}
+};
+MODULE_DEVICE_TABLE(i2c, ina219_id);
+
+static struct i2c_driver ina219_driver = {
+        .class          = I2C_CLASS_HWMON,
+        .driver = {
+                .name   = DRIVER_NAME,
+        },
+        .probe          = ina219_probe,
+        .remove         = __devexit_p(ina219_remove),
+        .id_table       = ina219_id,
+};
+
+static int __init ina219_init(void)
+{
+        return i2c_add_driver(&ina219_driver);
+}
+
+static void __exit ina219_exit(void)
+{
+        i2c_del_driver(&ina219_driver);
+}
+
+module_init(ina219_init);
+module_exit(ina219_exit);
+MODULE_LICENSE("GPL");