diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/hwmon/ltc4245.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/hwmon/ltc4245.c | 588 |
1 files changed, 0 insertions, 588 deletions
diff --git a/ANDROID_3.4.5/drivers/hwmon/ltc4245.c b/ANDROID_3.4.5/drivers/hwmon/ltc4245.c deleted file mode 100644 index b99b45ba..00000000 --- a/ANDROID_3.4.5/drivers/hwmon/ltc4245.c +++ /dev/null @@ -1,588 +0,0 @@ -/* - * 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"); |