zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/hwmon/ltc4245.c b/ap/os/linux/linux-3.4.x/drivers/hwmon/ltc4245.c
new file mode 100644
index 0000000..b99b45b
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hwmon/ltc4245.c
@@ -0,0 +1,588 @@
+/*
+ * Driver for Linear Technology LTC4245 I2C Multiple Supply Hot Swap Controller
+ *
+ * Copyright (C) 2008 Ira W. Snyder <iws@ovro.caltech.edu>
+ *
+ * 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; version 2 of the License.
+ *
+ * This driver is based on the ds1621 and ina209 drivers.
+ *
+ * Datasheet:
+ * http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1140,P19392,D13517
+ */
+
+#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 <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/i2c/ltc4245.h>
+
+/* Here are names of the chip's registers (a.k.a. commands) */
+enum ltc4245_cmd {
+ LTC4245_STATUS = 0x00, /* readonly */
+ LTC4245_ALERT = 0x01,
+ LTC4245_CONTROL = 0x02,
+ LTC4245_ON = 0x03,
+ LTC4245_FAULT1 = 0x04,
+ LTC4245_FAULT2 = 0x05,
+ LTC4245_GPIO = 0x06,
+ LTC4245_ADCADR = 0x07,
+
+ LTC4245_12VIN = 0x10,
+ LTC4245_12VSENSE = 0x11,
+ LTC4245_12VOUT = 0x12,
+ LTC4245_5VIN = 0x13,
+ LTC4245_5VSENSE = 0x14,
+ LTC4245_5VOUT = 0x15,
+ LTC4245_3VIN = 0x16,
+ LTC4245_3VSENSE = 0x17,
+ LTC4245_3VOUT = 0x18,
+ LTC4245_VEEIN = 0x19,
+ LTC4245_VEESENSE = 0x1a,
+ LTC4245_VEEOUT = 0x1b,
+ LTC4245_GPIOADC = 0x1c,
+};
+
+struct ltc4245_data {
+ struct device *hwmon_dev;
+
+ struct mutex update_lock;
+ bool valid;
+ unsigned long last_updated; /* in jiffies */
+
+ /* Control registers */
+ u8 cregs[0x08];
+
+ /* Voltage registers */
+ u8 vregs[0x0d];
+
+ /* GPIO ADC registers */
+ bool use_extra_gpios;
+ int gpios[3];
+};
+
+/*
+ * Update the readings from the GPIO pins. If the driver has been configured to
+ * sample all GPIO's as analog voltages, a round-robin sampling method is used.
+ * Otherwise, only the configured GPIO pin is sampled.
+ *
+ * LOCKING: must hold data->update_lock
+ */
+static void ltc4245_update_gpios(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ltc4245_data *data = i2c_get_clientdata(client);
+ u8 gpio_curr, gpio_next, gpio_reg;
+ int i;
+
+ /* no extra gpio support, we're basically done */
+ if (!data->use_extra_gpios) {
+ data->gpios[0] = data->vregs[LTC4245_GPIOADC - 0x10];
+ return;
+ }
+
+ /*
+ * If the last reading was too long ago, then we mark all old GPIO
+ * readings as stale by setting them to -EAGAIN
+ */
+ if (time_after(jiffies, data->last_updated + 5 * HZ)) {
+ dev_dbg(&client->dev, "Marking GPIOs invalid\n");
+ for (i = 0; i < ARRAY_SIZE(data->gpios); i++)
+ data->gpios[i] = -EAGAIN;
+ }
+
+ /*
+ * Get the current GPIO pin
+ *
+ * The datasheet calls these GPIO[1-3], but we'll calculate the zero
+ * based array index instead, and call them GPIO[0-2]. This is much
+ * easier to think about.
+ */
+ gpio_curr = (data->cregs[LTC4245_GPIO] & 0xc0) >> 6;
+ if (gpio_curr > 0)
+ gpio_curr -= 1;
+
+ /* Read the GPIO voltage from the GPIOADC register */
+ data->gpios[gpio_curr] = data->vregs[LTC4245_GPIOADC - 0x10];
+
+ /* Find the next GPIO pin to read */
+ gpio_next = (gpio_curr + 1) % ARRAY_SIZE(data->gpios);
+
+ /*
+ * Calculate the correct setting for the GPIO register so it will
+ * sample the next GPIO pin
+ */
+ gpio_reg = (data->cregs[LTC4245_GPIO] & 0x3f) | ((gpio_next + 1) << 6);
+
+ /* Update the GPIO register */
+ i2c_smbus_write_byte_data(client, LTC4245_GPIO, gpio_reg);
+
+ /* Update saved data */
+ data->cregs[LTC4245_GPIO] = gpio_reg;
+}
+
+static struct ltc4245_data *ltc4245_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ltc4245_data *data = i2c_get_clientdata(client);
+ s32 val;
+ int i;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+
+ dev_dbg(&client->dev, "Starting ltc4245 update\n");
+
+ /* Read control registers -- 0x00 to 0x07 */
+ for (i = 0; i < ARRAY_SIZE(data->cregs); i++) {
+ val = i2c_smbus_read_byte_data(client, i);
+ if (unlikely(val < 0))
+ data->cregs[i] = 0;
+ else
+ data->cregs[i] = val;
+ }
+
+ /* Read voltage registers -- 0x10 to 0x1c */
+ for (i = 0; i < ARRAY_SIZE(data->vregs); i++) {
+ val = i2c_smbus_read_byte_data(client, i+0x10);
+ if (unlikely(val < 0))
+ data->vregs[i] = 0;
+ else
+ data->vregs[i] = val;
+ }
+
+ /* Update GPIO readings */
+ ltc4245_update_gpios(dev);
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
+}
+
+/* Return the voltage from the given register in millivolts */
+static int ltc4245_get_voltage(struct device *dev, u8 reg)
+{
+ struct ltc4245_data *data = ltc4245_update_device(dev);
+ const u8 regval = data->vregs[reg - 0x10];
+ u32 voltage = 0;
+
+ switch (reg) {
+ case LTC4245_12VIN:
+ case LTC4245_12VOUT:
+ voltage = regval * 55;
+ break;
+ case LTC4245_5VIN:
+ case LTC4245_5VOUT:
+ voltage = regval * 22;
+ break;
+ case LTC4245_3VIN:
+ case LTC4245_3VOUT:
+ voltage = regval * 15;
+ break;
+ case LTC4245_VEEIN:
+ case LTC4245_VEEOUT:
+ voltage = regval * -55;
+ break;
+ case LTC4245_GPIOADC:
+ voltage = regval * 10;
+ break;
+ default:
+ /* If we get here, the developer messed up */
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ return voltage;
+}
+
+/* Return the current in the given sense register in milliAmperes */
+static unsigned int ltc4245_get_current(struct device *dev, u8 reg)
+{
+ struct ltc4245_data *data = ltc4245_update_device(dev);
+ const u8 regval = data->vregs[reg - 0x10];
+ unsigned int voltage;
+ unsigned int curr;
+
+ /*
+ * The strange looking conversions that follow are fixed-point
+ * math, since we cannot do floating point in the kernel.
+ *
+ * Step 1: convert sense register to microVolts
+ * Step 2: convert voltage to milliAmperes
+ *
+ * If you play around with the V=IR equation, you come up with
+ * the following: X uV / Y mOhm == Z mA
+ *
+ * With the resistors that are fractions of a milliOhm, we multiply
+ * the voltage and resistance by 10, to shift the decimal point.
+ * Now we can use the normal division operator again.
+ */
+
+ switch (reg) {
+ case LTC4245_12VSENSE:
+ voltage = regval * 250; /* voltage in uV */
+ curr = voltage / 50; /* sense resistor 50 mOhm */
+ break;
+ case LTC4245_5VSENSE:
+ voltage = regval * 125; /* voltage in uV */
+ curr = (voltage * 10) / 35; /* sense resistor 3.5 mOhm */
+ break;
+ case LTC4245_3VSENSE:
+ voltage = regval * 125; /* voltage in uV */
+ curr = (voltage * 10) / 25; /* sense resistor 2.5 mOhm */
+ break;
+ case LTC4245_VEESENSE:
+ voltage = regval * 250; /* voltage in uV */
+ curr = voltage / 100; /* sense resistor 100 mOhm */
+ break;
+ default:
+ /* If we get here, the developer messed up */
+ WARN_ON_ONCE(1);
+ curr = 0;
+ break;
+ }
+
+ return curr;
+}
+
+static ssize_t ltc4245_show_voltage(struct device *dev,
+ struct device_attribute *da,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ const int voltage = ltc4245_get_voltage(dev, attr->index);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", voltage);
+}
+
+static ssize_t ltc4245_show_current(struct device *dev,
+ struct device_attribute *da,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ const unsigned int curr = ltc4245_get_current(dev, attr->index);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", curr);
+}
+
+static ssize_t ltc4245_show_power(struct device *dev,
+ struct device_attribute *da,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ const unsigned int curr = ltc4245_get_current(dev, attr->index);
+ const int output_voltage = ltc4245_get_voltage(dev, attr->index+1);
+
+ /* current in mA * voltage in mV == power in uW */
+ const unsigned int power = abs(output_voltage * curr);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", power);
+}
+
+static ssize_t ltc4245_show_alarm(struct device *dev,
+ struct device_attribute *da,
+ char *buf)
+{
+ struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
+ struct ltc4245_data *data = ltc4245_update_device(dev);
+ const u8 reg = data->cregs[attr->index];
+ const u32 mask = attr->nr;
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", (reg & mask) ? 1 : 0);
+}
+
+static ssize_t ltc4245_show_gpio(struct device *dev,
+ struct device_attribute *da,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct ltc4245_data *data = ltc4245_update_device(dev);
+ int val = data->gpios[attr->index];
+
+ /* handle stale GPIO's */
+ if (val < 0)
+ return val;
+
+ /* Convert to millivolts and print */
+ return snprintf(buf, PAGE_SIZE, "%u\n", val * 10);
+}
+
+/*
+ * These macros are used below in constructing device attribute objects
+ * for use with sysfs_create_group() to make a sysfs device file
+ * for each register.
+ */
+
+#define LTC4245_VOLTAGE(name, ltc4245_cmd_idx) \
+ static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
+ ltc4245_show_voltage, NULL, ltc4245_cmd_idx)
+
+#define LTC4245_CURRENT(name, ltc4245_cmd_idx) \
+ static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
+ ltc4245_show_current, NULL, ltc4245_cmd_idx)
+
+#define LTC4245_POWER(name, ltc4245_cmd_idx) \
+ static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
+ ltc4245_show_power, NULL, ltc4245_cmd_idx)
+
+#define LTC4245_ALARM(name, mask, reg) \
+ static SENSOR_DEVICE_ATTR_2(name, S_IRUGO, \
+ ltc4245_show_alarm, NULL, (mask), reg)
+
+#define LTC4245_GPIO_VOLTAGE(name, gpio_num) \
+ static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
+ ltc4245_show_gpio, NULL, gpio_num)
+
+/* Construct a sensor_device_attribute structure for each register */
+
+/* Input voltages */
+LTC4245_VOLTAGE(in1_input, LTC4245_12VIN);
+LTC4245_VOLTAGE(in2_input, LTC4245_5VIN);
+LTC4245_VOLTAGE(in3_input, LTC4245_3VIN);
+LTC4245_VOLTAGE(in4_input, LTC4245_VEEIN);
+
+/* Input undervoltage alarms */
+LTC4245_ALARM(in1_min_alarm, (1 << 0), LTC4245_FAULT1);
+LTC4245_ALARM(in2_min_alarm, (1 << 1), LTC4245_FAULT1);
+LTC4245_ALARM(in3_min_alarm, (1 << 2), LTC4245_FAULT1);
+LTC4245_ALARM(in4_min_alarm, (1 << 3), LTC4245_FAULT1);
+
+/* Currents (via sense resistor) */
+LTC4245_CURRENT(curr1_input, LTC4245_12VSENSE);
+LTC4245_CURRENT(curr2_input, LTC4245_5VSENSE);
+LTC4245_CURRENT(curr3_input, LTC4245_3VSENSE);
+LTC4245_CURRENT(curr4_input, LTC4245_VEESENSE);
+
+/* Overcurrent alarms */
+LTC4245_ALARM(curr1_max_alarm, (1 << 4), LTC4245_FAULT1);
+LTC4245_ALARM(curr2_max_alarm, (1 << 5), LTC4245_FAULT1);
+LTC4245_ALARM(curr3_max_alarm, (1 << 6), LTC4245_FAULT1);
+LTC4245_ALARM(curr4_max_alarm, (1 << 7), LTC4245_FAULT1);
+
+/* Output voltages */
+LTC4245_VOLTAGE(in5_input, LTC4245_12VOUT);
+LTC4245_VOLTAGE(in6_input, LTC4245_5VOUT);
+LTC4245_VOLTAGE(in7_input, LTC4245_3VOUT);
+LTC4245_VOLTAGE(in8_input, LTC4245_VEEOUT);
+
+/* Power Bad alarms */
+LTC4245_ALARM(in5_min_alarm, (1 << 0), LTC4245_FAULT2);
+LTC4245_ALARM(in6_min_alarm, (1 << 1), LTC4245_FAULT2);
+LTC4245_ALARM(in7_min_alarm, (1 << 2), LTC4245_FAULT2);
+LTC4245_ALARM(in8_min_alarm, (1 << 3), LTC4245_FAULT2);
+
+/* GPIO voltages */
+LTC4245_GPIO_VOLTAGE(in9_input, 0);
+LTC4245_GPIO_VOLTAGE(in10_input, 1);
+LTC4245_GPIO_VOLTAGE(in11_input, 2);
+
+/* Power Consumption (virtual) */
+LTC4245_POWER(power1_input, LTC4245_12VSENSE);
+LTC4245_POWER(power2_input, LTC4245_5VSENSE);
+LTC4245_POWER(power3_input, LTC4245_3VSENSE);
+LTC4245_POWER(power4_input, LTC4245_VEESENSE);
+
+/*
+ * Finally, construct an array of pointers to members of the above objects,
+ * as required for sysfs_create_group()
+ */
+static struct attribute *ltc4245_std_attributes[] = {
+ &sensor_dev_attr_in1_input.dev_attr.attr,
+ &sensor_dev_attr_in2_input.dev_attr.attr,
+ &sensor_dev_attr_in3_input.dev_attr.attr,
+ &sensor_dev_attr_in4_input.dev_attr.attr,
+
+ &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_in2_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_in3_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_in4_min_alarm.dev_attr.attr,
+
+ &sensor_dev_attr_curr1_input.dev_attr.attr,
+ &sensor_dev_attr_curr2_input.dev_attr.attr,
+ &sensor_dev_attr_curr3_input.dev_attr.attr,
+ &sensor_dev_attr_curr4_input.dev_attr.attr,
+
+ &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_curr2_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_curr3_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_curr4_max_alarm.dev_attr.attr,
+
+ &sensor_dev_attr_in5_input.dev_attr.attr,
+ &sensor_dev_attr_in6_input.dev_attr.attr,
+ &sensor_dev_attr_in7_input.dev_attr.attr,
+ &sensor_dev_attr_in8_input.dev_attr.attr,
+
+ &sensor_dev_attr_in5_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_in6_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_in7_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_in8_min_alarm.dev_attr.attr,
+
+ &sensor_dev_attr_in9_input.dev_attr.attr,
+
+ &sensor_dev_attr_power1_input.dev_attr.attr,
+ &sensor_dev_attr_power2_input.dev_attr.attr,
+ &sensor_dev_attr_power3_input.dev_attr.attr,
+ &sensor_dev_attr_power4_input.dev_attr.attr,
+
+ NULL,
+};
+
+static struct attribute *ltc4245_gpio_attributes[] = {
+ &sensor_dev_attr_in10_input.dev_attr.attr,
+ &sensor_dev_attr_in11_input.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ltc4245_std_group = {
+ .attrs = ltc4245_std_attributes,
+};
+
+static const struct attribute_group ltc4245_gpio_group = {
+ .attrs = ltc4245_gpio_attributes,
+};
+
+static int ltc4245_sysfs_create_groups(struct i2c_client *client)
+{
+ struct ltc4245_data *data = i2c_get_clientdata(client);
+ struct device *dev = &client->dev;
+ int ret;
+
+ /* register the standard sysfs attributes */
+ ret = sysfs_create_group(&dev->kobj, <c4245_std_group);
+ if (ret) {
+ dev_err(dev, "unable to register standard attributes\n");
+ return ret;
+ }
+
+ /* if we're using the extra gpio support, register it's attributes */
+ if (data->use_extra_gpios) {
+ ret = sysfs_create_group(&dev->kobj, <c4245_gpio_group);
+ if (ret) {
+ dev_err(dev, "unable to register gpio attributes\n");
+ sysfs_remove_group(&dev->kobj, <c4245_std_group);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static void ltc4245_sysfs_remove_groups(struct i2c_client *client)
+{
+ struct ltc4245_data *data = i2c_get_clientdata(client);
+ struct device *dev = &client->dev;
+
+ if (data->use_extra_gpios)
+ sysfs_remove_group(&dev->kobj, <c4245_gpio_group);
+
+ sysfs_remove_group(&dev->kobj, <c4245_std_group);
+}
+
+static bool ltc4245_use_extra_gpios(struct i2c_client *client)
+{
+ struct ltc4245_platform_data *pdata = dev_get_platdata(&client->dev);
+#ifdef CONFIG_OF
+ struct device_node *np = client->dev.of_node;
+#endif
+
+ /* prefer platform data */
+ if (pdata)
+ return pdata->use_extra_gpios;
+
+#ifdef CONFIG_OF
+ /* fallback on OF */
+ if (of_find_property(np, "ltc4245,use-extra-gpios", NULL))
+ return true;
+#endif
+
+ return false;
+}
+
+static int ltc4245_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ struct ltc4245_data *data;
+ int ret;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ ret = -ENOMEM;
+ goto out_kzalloc;
+ }
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+ data->use_extra_gpios = ltc4245_use_extra_gpios(client);
+
+ /* Initialize the LTC4245 chip */
+ i2c_smbus_write_byte_data(client, LTC4245_FAULT1, 0x00);
+ i2c_smbus_write_byte_data(client, LTC4245_FAULT2, 0x00);
+
+ /* Register sysfs hooks */
+ ret = ltc4245_sysfs_create_groups(client);
+ if (ret)
+ goto out_sysfs_create_groups;
+
+ data->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ ret = PTR_ERR(data->hwmon_dev);
+ goto out_hwmon_device_register;
+ }
+
+ return 0;
+
+out_hwmon_device_register:
+ ltc4245_sysfs_remove_groups(client);
+out_sysfs_create_groups:
+ kfree(data);
+out_kzalloc:
+ return ret;
+}
+
+static int ltc4245_remove(struct i2c_client *client)
+{
+ struct ltc4245_data *data = i2c_get_clientdata(client);
+
+ hwmon_device_unregister(data->hwmon_dev);
+ ltc4245_sysfs_remove_groups(client);
+ kfree(data);
+
+ return 0;
+}
+
+static const struct i2c_device_id ltc4245_id[] = {
+ { "ltc4245", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ltc4245_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver ltc4245_driver = {
+ .driver = {
+ .name = "ltc4245",
+ },
+ .probe = ltc4245_probe,
+ .remove = ltc4245_remove,
+ .id_table = ltc4245_id,
+};
+
+module_i2c_driver(ltc4245_driver);
+
+MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
+MODULE_DESCRIPTION("LTC4245 driver");
+MODULE_LICENSE("GPL");