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1135 lines
30 KiB
1135 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* envctrl.c: Temperature and Fan monitoring on Machines providing it. |
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* |
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* Copyright (C) 1998 Eddie C. Dost ([email protected]) |
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* Copyright (C) 2000 Vinh Truong ([email protected]) |
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* VT - The implementation is to support Sun Microelectronics (SME) platform |
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* environment monitoring. SME platforms use pcf8584 as the i2c bus |
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* controller to access pcf8591 (8-bit A/D and D/A converter) and |
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* pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface). |
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* At board level, it follows SME Firmware I2C Specification. Reference: |
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* http://www-eu2.semiconductors.com/pip/PCF8584P |
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* http://www-eu2.semiconductors.com/pip/PCF8574AP |
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* http://www-eu2.semiconductors.com/pip/PCF8591P |
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* |
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* EB - Added support for CP1500 Global Address and PS/Voltage monitoring. |
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* Eric Brower <[email protected]> |
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* |
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* DB - Audit every copy_to_user in envctrl_read. |
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* Daniele Bellucci <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/kthread.h> |
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#include <linux/delay.h> |
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#include <linux/ioport.h> |
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#include <linux/miscdevice.h> |
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#include <linux/kmod.h> |
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#include <linux/reboot.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/envctrl.h> |
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#include <asm/io.h> |
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|
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#define DRIVER_NAME "envctrl" |
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#define PFX DRIVER_NAME ": " |
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|
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#define PCF8584_ADDRESS 0x55 |
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|
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#define CONTROL_PIN 0x80 |
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#define CONTROL_ES0 0x40 |
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#define CONTROL_ES1 0x20 |
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#define CONTROL_ES2 0x10 |
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#define CONTROL_ENI 0x08 |
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#define CONTROL_STA 0x04 |
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#define CONTROL_STO 0x02 |
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#define CONTROL_ACK 0x01 |
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|
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#define STATUS_PIN 0x80 |
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#define STATUS_STS 0x20 |
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#define STATUS_BER 0x10 |
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#define STATUS_LRB 0x08 |
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#define STATUS_AD0 0x08 |
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#define STATUS_AAB 0x04 |
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#define STATUS_LAB 0x02 |
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#define STATUS_BB 0x01 |
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|
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/* |
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* CLK Mode Register. |
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*/ |
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#define BUS_CLK_90 0x00 |
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#define BUS_CLK_45 0x01 |
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#define BUS_CLK_11 0x02 |
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#define BUS_CLK_1_5 0x03 |
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#define CLK_3 0x00 |
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#define CLK_4_43 0x10 |
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#define CLK_6 0x14 |
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#define CLK_8 0x18 |
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#define CLK_12 0x1c |
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|
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#define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */ |
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#define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */ |
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|
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/* Monitor type of i2c child device. |
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* Firmware definitions. |
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*/ |
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#define PCF8584_MAX_CHANNELS 8 |
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#define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */ |
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#define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */ |
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#define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */ |
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#define PCF8584_TEMP_TYPE 1 /* temperature monitor*/ |
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|
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/* Monitor type of i2c child device. |
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* Driver definitions. |
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*/ |
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#define ENVCTRL_NOMON 0 |
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#define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */ |
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#define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */ |
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#define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */ |
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#define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperature */ |
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/* monitor */ |
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#define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */ |
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#define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */ |
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#define ENVCTRL_SCSITEMP_MON 7 /* scsi temperature */ |
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#define ENVCTRL_GLOBALADDR_MON 8 /* global address */ |
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|
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/* Child device type. |
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* Driver definitions. |
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*/ |
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#define I2C_ADC 0 /* pcf8591 */ |
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#define I2C_GPIO 1 /* pcf8571 */ |
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|
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/* Data read from child device may need to decode |
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* through a data table and a scale. |
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* Translation type as defined by firmware. |
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*/ |
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#define ENVCTRL_TRANSLATE_NO 0 |
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#define ENVCTRL_TRANSLATE_PARTIAL 1 |
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#define ENVCTRL_TRANSLATE_COMBINED 2 |
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#define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */ |
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#define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */ |
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|
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/* Driver miscellaneous definitions. */ |
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#define ENVCTRL_MAX_CPU 4 |
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#define CHANNEL_DESC_SZ 256 |
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|
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/* Mask values for combined GlobalAddress/PowerStatus node */ |
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#define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F |
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#define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60 |
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|
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/* Node 0x70 ignored on CompactPCI CP1400/1500 platforms |
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* (see envctrl_init_i2c_child) |
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*/ |
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#define ENVCTRL_CPCI_IGNORED_NODE 0x70 |
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#define PCF8584_DATA 0x00 |
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#define PCF8584_CSR 0x01 |
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|
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/* Each child device can be monitored by up to PCF8584_MAX_CHANNELS. |
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* Property of a port or channel as defined by the firmware. |
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*/ |
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struct pcf8584_channel { |
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unsigned char chnl_no; |
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unsigned char io_direction; |
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unsigned char type; |
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unsigned char last; |
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}; |
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|
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/* Each child device may have one or more tables of bytes to help decode |
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* data. Table property as defined by the firmware. |
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*/ |
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struct pcf8584_tblprop { |
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unsigned int type; |
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unsigned int scale; |
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unsigned int offset; /* offset from the beginning of the table */ |
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unsigned int size; |
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}; |
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|
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/* i2c child */ |
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struct i2c_child_t { |
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/* Either ADC or GPIO. */ |
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unsigned char i2ctype; |
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unsigned long addr; |
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struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS]; |
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|
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/* Channel info. */ |
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unsigned int total_chnls; /* Number of monitor channels. */ |
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unsigned char fan_mask; /* Byte mask for fan status channels. */ |
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unsigned char voltage_mask; /* Byte mask for voltage status channels. */ |
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struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS]; |
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|
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/* Properties of all monitor channels. */ |
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unsigned int total_tbls; /* Number of monitor tables. */ |
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char *tables; /* Pointer to table(s). */ |
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char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */ |
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char mon_type[PCF8584_MAX_CHANNELS]; |
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}; |
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|
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static void __iomem *i2c; |
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static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2]; |
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static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }; |
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static unsigned int warning_temperature = 0; |
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static unsigned int shutdown_temperature = 0; |
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static char read_cpu; |
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|
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/* Forward declarations. */ |
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static struct i2c_child_t *envctrl_get_i2c_child(unsigned char); |
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|
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/* Function Description: Test the PIN bit (Pending Interrupt Not) |
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* to test when serial transmission is completed . |
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* Return : None. |
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*/ |
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static void envtrl_i2c_test_pin(void) |
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{ |
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int limit = 1000000; |
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|
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while (--limit > 0) { |
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if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN)) |
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break; |
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udelay(1); |
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} |
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|
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if (limit <= 0) |
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printk(KERN_INFO PFX "Pin status will not clear.\n"); |
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} |
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|
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/* Function Description: Test busy bit. |
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* Return : None. |
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*/ |
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static void envctrl_i2c_test_bb(void) |
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{ |
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int limit = 1000000; |
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|
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while (--limit > 0) { |
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/* Busy bit 0 means busy. */ |
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if (readb(i2c + PCF8584_CSR) & STATUS_BB) |
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break; |
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udelay(1); |
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} |
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if (limit <= 0) |
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printk(KERN_INFO PFX "Busy bit will not clear.\n"); |
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} |
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|
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/* Function Description: Send the address for a read access. |
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* Return : 0 if not acknowledged, otherwise acknowledged. |
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*/ |
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static int envctrl_i2c_read_addr(unsigned char addr) |
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{ |
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envctrl_i2c_test_bb(); |
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|
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/* Load address. */ |
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writeb(addr + 1, i2c + PCF8584_DATA); |
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envctrl_i2c_test_bb(); |
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writeb(OBD_SEND_START, i2c + PCF8584_CSR); |
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|
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/* Wait for PIN. */ |
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envtrl_i2c_test_pin(); |
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|
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/* CSR 0 means acknowledged. */ |
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if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) { |
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return readb(i2c + PCF8584_DATA); |
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} else { |
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writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); |
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return 0; |
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} |
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} |
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|
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/* Function Description: Send the address for write mode. |
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* Return : None. |
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*/ |
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static void envctrl_i2c_write_addr(unsigned char addr) |
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{ |
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envctrl_i2c_test_bb(); |
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writeb(addr, i2c + PCF8584_DATA); |
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|
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/* Generate Start condition. */ |
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writeb(OBD_SEND_START, i2c + PCF8584_CSR); |
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} |
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|
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/* Function Description: Read 1 byte of data from addr |
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* set by envctrl_i2c_read_addr() |
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* Return : Data from address set by envctrl_i2c_read_addr(). |
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*/ |
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static unsigned char envctrl_i2c_read_data(void) |
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{ |
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envtrl_i2c_test_pin(); |
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writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */ |
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return readb(i2c + PCF8584_DATA); |
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} |
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|
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/* Function Description: Instruct the device which port to read data from. |
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* Return : None. |
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*/ |
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static void envctrl_i2c_write_data(unsigned char port) |
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{ |
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envtrl_i2c_test_pin(); |
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writeb(port, i2c + PCF8584_DATA); |
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} |
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|
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/* Function Description: Generate Stop condition after last byte is sent. |
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* Return : None. |
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*/ |
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static void envctrl_i2c_stop(void) |
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{ |
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envtrl_i2c_test_pin(); |
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writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); |
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} |
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/* Function Description: Read adc device. |
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* Return : Data at address and port. |
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*/ |
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static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port) |
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{ |
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/* Send address. */ |
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envctrl_i2c_write_addr(addr); |
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|
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/* Setup port to read. */ |
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envctrl_i2c_write_data(port); |
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envctrl_i2c_stop(); |
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|
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/* Read port. */ |
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envctrl_i2c_read_addr(addr); |
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|
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/* Do a single byte read and send stop. */ |
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envctrl_i2c_read_data(); |
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envctrl_i2c_stop(); |
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return readb(i2c + PCF8584_DATA); |
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} |
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/* Function Description: Read gpio device. |
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* Return : Data at address. |
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*/ |
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static unsigned char envctrl_i2c_read_8574(unsigned char addr) |
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{ |
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unsigned char rd; |
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envctrl_i2c_read_addr(addr); |
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|
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/* Do a single byte read and send stop. */ |
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rd = envctrl_i2c_read_data(); |
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envctrl_i2c_stop(); |
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return rd; |
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} |
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/* Function Description: Decode data read from an adc device using firmware |
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* table. |
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* Return: Number of read bytes. Data is stored in bufdata in ascii format. |
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*/ |
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static int envctrl_i2c_data_translate(unsigned char data, int translate_type, |
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int scale, char *tbl, char *bufdata) |
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{ |
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int len = 0; |
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switch (translate_type) { |
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case ENVCTRL_TRANSLATE_NO: |
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/* No decode necessary. */ |
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len = 1; |
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bufdata[0] = data; |
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break; |
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case ENVCTRL_TRANSLATE_FULL: |
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/* Decode this way: data = table[data]. */ |
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len = 1; |
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bufdata[0] = tbl[data]; |
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break; |
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|
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case ENVCTRL_TRANSLATE_SCALE: |
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/* Decode this way: data = table[data]/scale */ |
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sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale)); |
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len = strlen(bufdata); |
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bufdata[len - 1] = bufdata[len - 2]; |
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bufdata[len - 2] = '.'; |
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break; |
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|
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default: |
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break; |
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} |
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|
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return len; |
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} |
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/* Function Description: Read cpu-related data such as cpu temperature, voltage. |
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* Return: Number of read bytes. Data is stored in bufdata in ascii format. |
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*/ |
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static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild, |
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char mon_type, unsigned char *bufdata) |
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{ |
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unsigned char data; |
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int i; |
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char *tbl, j = -1; |
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|
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/* Find the right monitor type and channel. */ |
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for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { |
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if (pchild->mon_type[i] == mon_type) { |
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if (++j == cpu) { |
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break; |
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} |
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} |
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} |
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if (j != cpu) |
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return 0; |
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|
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/* Read data from address and port. */ |
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data = envctrl_i2c_read_8591((unsigned char)pchild->addr, |
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(unsigned char)pchild->chnl_array[i].chnl_no); |
|
|
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/* Find decoding table. */ |
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tbl = pchild->tables + pchild->tblprop_array[i].offset; |
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|
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return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, |
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pchild->tblprop_array[i].scale, |
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tbl, bufdata); |
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} |
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|
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/* Function Description: Read noncpu-related data such as motherboard |
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* temperature. |
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* Return: Number of read bytes. Data is stored in bufdata in ascii format. |
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*/ |
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static int envctrl_read_noncpu_info(struct i2c_child_t *pchild, |
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char mon_type, unsigned char *bufdata) |
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{ |
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unsigned char data; |
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int i; |
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char *tbl = NULL; |
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|
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for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { |
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if (pchild->mon_type[i] == mon_type) |
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break; |
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} |
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|
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if (i >= PCF8584_MAX_CHANNELS) |
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return 0; |
|
|
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/* Read data from address and port. */ |
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data = envctrl_i2c_read_8591((unsigned char)pchild->addr, |
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(unsigned char)pchild->chnl_array[i].chnl_no); |
|
|
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/* Find decoding table. */ |
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tbl = pchild->tables + pchild->tblprop_array[i].offset; |
|
|
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return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, |
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pchild->tblprop_array[i].scale, |
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tbl, bufdata); |
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} |
|
|
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/* Function Description: Read fan status. |
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* Return : Always 1 byte. Status stored in bufdata. |
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*/ |
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static int envctrl_i2c_fan_status(struct i2c_child_t *pchild, |
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unsigned char data, |
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char *bufdata) |
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{ |
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unsigned char tmp, ret = 0; |
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int i, j = 0; |
|
|
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tmp = data & pchild->fan_mask; |
|
|
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if (tmp == pchild->fan_mask) { |
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/* All bits are on. All fans are functioning. */ |
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ret = ENVCTRL_ALL_FANS_GOOD; |
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} else if (tmp == 0) { |
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/* No bits are on. No fans are functioning. */ |
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ret = ENVCTRL_ALL_FANS_BAD; |
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} else { |
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/* Go through all channels, mark 'on' the matched bits. |
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* Notice that fan_mask may have discontiguous bits but |
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* return mask are always contiguous. For example if we |
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* monitor 4 fans at channels 0,1,2,4, the return mask |
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* should be 00010000 if only fan at channel 4 is working. |
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*/ |
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for (i = 0; i < PCF8584_MAX_CHANNELS;i++) { |
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if (pchild->fan_mask & chnls_mask[i]) { |
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if (!(chnls_mask[i] & tmp)) |
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ret |= chnls_mask[j]; |
|
|
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j++; |
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} |
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} |
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} |
|
|
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bufdata[0] = ret; |
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return 1; |
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} |
|
|
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/* Function Description: Read global addressing line. |
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* Return : Always 1 byte. Status stored in bufdata. |
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*/ |
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static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild, |
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unsigned char data, |
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char *bufdata) |
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{ |
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/* Translatation table is not necessary, as global |
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* addr is the integer value of the GA# bits. |
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* |
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* NOTE: MSB is documented as zero, but I see it as '1' always.... |
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* |
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* ----------------------------------------------- |
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* | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 | |
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* ----------------------------------------------- |
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* GA0 - GA4 integer value of Global Address (backplane slot#) |
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* DEG 0 = cPCI Power supply output is starting to degrade |
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* 1 = cPCI Power supply output is OK |
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* FAL 0 = cPCI Power supply has failed |
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* 1 = cPCI Power supply output is OK |
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*/ |
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bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK); |
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return 1; |
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} |
|
|
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/* Function Description: Read standard voltage and power supply status. |
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* Return : Always 1 byte. Status stored in bufdata. |
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*/ |
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static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild, |
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unsigned char data, |
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char *bufdata) |
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{ |
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unsigned char tmp, ret = 0; |
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int i, j = 0; |
|
|
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tmp = data & pchild->voltage_mask; |
|
|
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/* Two channels are used to monitor voltage and power supply. */ |
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if (tmp == pchild->voltage_mask) { |
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/* All bits are on. Voltage and power supply are okay. */ |
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ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD; |
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} else if (tmp == 0) { |
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/* All bits are off. Voltage and power supply are bad */ |
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ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD; |
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} else { |
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/* Either voltage or power supply has problem. */ |
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for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { |
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if (pchild->voltage_mask & chnls_mask[i]) { |
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j++; |
|
|
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/* Break out when there is a mismatch. */ |
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if (!(chnls_mask[i] & tmp)) |
|
break; |
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} |
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} |
|
|
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/* Make a wish that hardware will always use the |
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* first channel for voltage and the second for |
|
* power supply. |
|
*/ |
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if (j == 1) |
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ret = ENVCTRL_VOLTAGE_BAD; |
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else |
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ret = ENVCTRL_POWERSUPPLY_BAD; |
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} |
|
|
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bufdata[0] = ret; |
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return 1; |
|
} |
|
|
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/* Function Description: Read a byte from /dev/envctrl. Mapped to user read(). |
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* Return: Number of read bytes. 0 for error. |
|
*/ |
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static ssize_t |
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envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
|
{ |
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struct i2c_child_t *pchild; |
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unsigned char data[10]; |
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int ret = 0; |
|
|
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/* Get the type of read as decided in ioctl() call. |
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* Find the appropriate i2c child. |
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* Get the data and put back to the user buffer. |
|
*/ |
|
|
|
switch ((int)(long)file->private_data) { |
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case ENVCTRL_RD_WARNING_TEMPERATURE: |
|
if (warning_temperature == 0) |
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return 0; |
|
|
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data[0] = (unsigned char)(warning_temperature); |
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ret = 1; |
|
if (copy_to_user(buf, data, ret)) |
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ret = -EFAULT; |
|
break; |
|
|
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case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: |
|
if (shutdown_temperature == 0) |
|
return 0; |
|
|
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data[0] = (unsigned char)(shutdown_temperature); |
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ret = 1; |
|
if (copy_to_user(buf, data, ret)) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case ENVCTRL_RD_MTHRBD_TEMPERATURE: |
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON))) |
|
return 0; |
|
ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data); |
|
if (copy_to_user(buf, data, ret)) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case ENVCTRL_RD_CPU_TEMPERATURE: |
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) |
|
return 0; |
|
ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data); |
|
|
|
/* Reset cpu to the default cpu0. */ |
|
if (copy_to_user(buf, data, ret)) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case ENVCTRL_RD_CPU_VOLTAGE: |
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON))) |
|
return 0; |
|
ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data); |
|
|
|
/* Reset cpu to the default cpu0. */ |
|
if (copy_to_user(buf, data, ret)) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case ENVCTRL_RD_SCSI_TEMPERATURE: |
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON))) |
|
return 0; |
|
ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data); |
|
if (copy_to_user(buf, data, ret)) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case ENVCTRL_RD_ETHERNET_TEMPERATURE: |
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON))) |
|
return 0; |
|
ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data); |
|
if (copy_to_user(buf, data, ret)) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case ENVCTRL_RD_FAN_STATUS: |
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON))) |
|
return 0; |
|
data[0] = envctrl_i2c_read_8574(pchild->addr); |
|
ret = envctrl_i2c_fan_status(pchild,data[0], data); |
|
if (copy_to_user(buf, data, ret)) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case ENVCTRL_RD_GLOBALADDRESS: |
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) |
|
return 0; |
|
data[0] = envctrl_i2c_read_8574(pchild->addr); |
|
ret = envctrl_i2c_globaladdr(pchild, data[0], data); |
|
if (copy_to_user(buf, data, ret)) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case ENVCTRL_RD_VOLTAGE_STATUS: |
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON))) |
|
/* If voltage monitor not present, check for CPCI equivalent */ |
|
if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) |
|
return 0; |
|
data[0] = envctrl_i2c_read_8574(pchild->addr); |
|
ret = envctrl_i2c_voltage_status(pchild, data[0], data); |
|
if (copy_to_user(buf, data, ret)) |
|
ret = -EFAULT; |
|
break; |
|
|
|
default: |
|
break; |
|
|
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/* Function Description: Command what to read. Mapped to user ioctl(). |
|
* Return: Gives 0 for implemented commands, -EINVAL otherwise. |
|
*/ |
|
static long |
|
envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
|
{ |
|
char __user *infobuf; |
|
|
|
switch (cmd) { |
|
case ENVCTRL_RD_WARNING_TEMPERATURE: |
|
case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: |
|
case ENVCTRL_RD_MTHRBD_TEMPERATURE: |
|
case ENVCTRL_RD_FAN_STATUS: |
|
case ENVCTRL_RD_VOLTAGE_STATUS: |
|
case ENVCTRL_RD_ETHERNET_TEMPERATURE: |
|
case ENVCTRL_RD_SCSI_TEMPERATURE: |
|
case ENVCTRL_RD_GLOBALADDRESS: |
|
file->private_data = (void *)(long)cmd; |
|
break; |
|
|
|
case ENVCTRL_RD_CPU_TEMPERATURE: |
|
case ENVCTRL_RD_CPU_VOLTAGE: |
|
/* Check to see if application passes in any cpu number, |
|
* the default is cpu0. |
|
*/ |
|
infobuf = (char __user *) arg; |
|
if (infobuf == NULL) { |
|
read_cpu = 0; |
|
}else { |
|
get_user(read_cpu, infobuf); |
|
} |
|
|
|
/* Save the command for use when reading. */ |
|
file->private_data = (void *)(long)cmd; |
|
break; |
|
|
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* Function Description: open device. Mapped to user open(). |
|
* Return: Always 0. |
|
*/ |
|
static int |
|
envctrl_open(struct inode *inode, struct file *file) |
|
{ |
|
file->private_data = NULL; |
|
return 0; |
|
} |
|
|
|
/* Function Description: Open device. Mapped to user close(). |
|
* Return: Always 0. |
|
*/ |
|
static int |
|
envctrl_release(struct inode *inode, struct file *file) |
|
{ |
|
return 0; |
|
} |
|
|
|
static const struct file_operations envctrl_fops = { |
|
.owner = THIS_MODULE, |
|
.read = envctrl_read, |
|
.unlocked_ioctl = envctrl_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
.open = envctrl_open, |
|
.release = envctrl_release, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static struct miscdevice envctrl_dev = { |
|
ENVCTRL_MINOR, |
|
"envctrl", |
|
&envctrl_fops |
|
}; |
|
|
|
/* Function Description: Set monitor type based on firmware description. |
|
* Return: None. |
|
*/ |
|
static void envctrl_set_mon(struct i2c_child_t *pchild, |
|
const char *chnl_desc, |
|
int chnl_no) |
|
{ |
|
/* Firmware only has temperature type. It does not distinguish |
|
* different kinds of temperatures. We use channel description |
|
* to disinguish them. |
|
*/ |
|
if (!(strcmp(chnl_desc,"temp,cpu")) || |
|
!(strcmp(chnl_desc,"temp,cpu0")) || |
|
!(strcmp(chnl_desc,"temp,cpu1")) || |
|
!(strcmp(chnl_desc,"temp,cpu2")) || |
|
!(strcmp(chnl_desc,"temp,cpu3"))) |
|
pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON; |
|
|
|
if (!(strcmp(chnl_desc,"vddcore,cpu0")) || |
|
!(strcmp(chnl_desc,"vddcore,cpu1")) || |
|
!(strcmp(chnl_desc,"vddcore,cpu2")) || |
|
!(strcmp(chnl_desc,"vddcore,cpu3"))) |
|
pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON; |
|
|
|
if (!(strcmp(chnl_desc,"temp,motherboard"))) |
|
pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON; |
|
|
|
if (!(strcmp(chnl_desc,"temp,scsi"))) |
|
pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON; |
|
|
|
if (!(strcmp(chnl_desc,"temp,ethernet"))) |
|
pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON; |
|
} |
|
|
|
/* Function Description: Initialize monitor channel with channel desc, |
|
* decoding tables, monitor type, optional properties. |
|
* Return: None. |
|
*/ |
|
static void envctrl_init_adc(struct i2c_child_t *pchild, struct device_node *dp) |
|
{ |
|
int i = 0, len; |
|
const char *pos; |
|
const unsigned int *pval; |
|
|
|
/* Firmware describe channels into a stream separated by a '\0'. */ |
|
pos = of_get_property(dp, "channels-description", &len); |
|
|
|
while (len > 0) { |
|
int l = strlen(pos) + 1; |
|
envctrl_set_mon(pchild, pos, i++); |
|
len -= l; |
|
pos += l; |
|
} |
|
|
|
/* Get optional properties. */ |
|
pval = of_get_property(dp, "warning-temp", NULL); |
|
if (pval) |
|
warning_temperature = *pval; |
|
|
|
pval = of_get_property(dp, "shutdown-temp", NULL); |
|
if (pval) |
|
shutdown_temperature = *pval; |
|
} |
|
|
|
/* Function Description: Initialize child device monitoring fan status. |
|
* Return: None. |
|
*/ |
|
static void envctrl_init_fanstat(struct i2c_child_t *pchild) |
|
{ |
|
int i; |
|
|
|
/* Go through all channels and set up the mask. */ |
|
for (i = 0; i < pchild->total_chnls; i++) |
|
pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; |
|
|
|
/* We only need to know if this child has fan status monitored. |
|
* We don't care which channels since we have the mask already. |
|
*/ |
|
pchild->mon_type[0] = ENVCTRL_FANSTAT_MON; |
|
} |
|
|
|
/* Function Description: Initialize child device for global addressing line. |
|
* Return: None. |
|
*/ |
|
static void envctrl_init_globaladdr(struct i2c_child_t *pchild) |
|
{ |
|
int i; |
|
|
|
/* Voltage/PowerSupply monitoring is piggybacked |
|
* with Global Address on CompactPCI. See comments |
|
* within envctrl_i2c_globaladdr for bit assignments. |
|
* |
|
* The mask is created here by assigning mask bits to each |
|
* bit position that represents PCF8584_VOLTAGE_TYPE data. |
|
* Channel numbers are not consecutive within the globaladdr |
|
* node (why?), so we use the actual counter value as chnls_mask |
|
* index instead of the chnl_array[x].chnl_no value. |
|
* |
|
* NOTE: This loop could be replaced with a constant representing |
|
* a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK). |
|
*/ |
|
for (i = 0; i < pchild->total_chnls; i++) { |
|
if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) { |
|
pchild->voltage_mask |= chnls_mask[i]; |
|
} |
|
} |
|
|
|
/* We only need to know if this child has global addressing |
|
* line monitored. We don't care which channels since we know |
|
* the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK). |
|
*/ |
|
pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON; |
|
} |
|
|
|
/* Initialize child device monitoring voltage status. */ |
|
static void envctrl_init_voltage_status(struct i2c_child_t *pchild) |
|
{ |
|
int i; |
|
|
|
/* Go through all channels and set up the mask. */ |
|
for (i = 0; i < pchild->total_chnls; i++) |
|
pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; |
|
|
|
/* We only need to know if this child has voltage status monitored. |
|
* We don't care which channels since we have the mask already. |
|
*/ |
|
pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON; |
|
} |
|
|
|
/* Function Description: Initialize i2c child device. |
|
* Return: None. |
|
*/ |
|
static void envctrl_init_i2c_child(struct device_node *dp, |
|
struct i2c_child_t *pchild) |
|
{ |
|
int len, i, tbls_size = 0; |
|
const void *pval; |
|
|
|
/* Get device address. */ |
|
pval = of_get_property(dp, "reg", &len); |
|
memcpy(&pchild->addr, pval, len); |
|
|
|
/* Get tables property. Read firmware temperature tables. */ |
|
pval = of_get_property(dp, "translation", &len); |
|
if (pval && len > 0) { |
|
memcpy(pchild->tblprop_array, pval, len); |
|
pchild->total_tbls = len / sizeof(struct pcf8584_tblprop); |
|
for (i = 0; i < pchild->total_tbls; i++) { |
|
if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) { |
|
tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset; |
|
} |
|
} |
|
|
|
pchild->tables = kmalloc(tbls_size, GFP_KERNEL); |
|
if (pchild->tables == NULL){ |
|
printk(KERN_ERR PFX "Failed to allocate table.\n"); |
|
return; |
|
} |
|
pval = of_get_property(dp, "tables", &len); |
|
if (!pval || len <= 0) { |
|
printk(KERN_ERR PFX "Failed to get table.\n"); |
|
return; |
|
} |
|
memcpy(pchild->tables, pval, len); |
|
} |
|
|
|
/* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04) |
|
* sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is |
|
* "For Factory Use Only." |
|
* |
|
* We ignore the node on these platforms by assigning the |
|
* 'NULL' monitor type. |
|
*/ |
|
if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) { |
|
struct device_node *root_node; |
|
int len; |
|
|
|
root_node = of_find_node_by_path("/"); |
|
if (of_node_name_eq(root_node, "SUNW,UltraSPARC-IIi-cEngine")) { |
|
for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) { |
|
pchild->mon_type[len] = ENVCTRL_NOMON; |
|
} |
|
of_node_put(root_node); |
|
return; |
|
} |
|
of_node_put(root_node); |
|
} |
|
|
|
/* Get the monitor channels. */ |
|
pval = of_get_property(dp, "channels-in-use", &len); |
|
memcpy(pchild->chnl_array, pval, len); |
|
pchild->total_chnls = len / sizeof(struct pcf8584_channel); |
|
|
|
for (i = 0; i < pchild->total_chnls; i++) { |
|
switch (pchild->chnl_array[i].type) { |
|
case PCF8584_TEMP_TYPE: |
|
envctrl_init_adc(pchild, dp); |
|
break; |
|
|
|
case PCF8584_GLOBALADDR_TYPE: |
|
envctrl_init_globaladdr(pchild); |
|
i = pchild->total_chnls; |
|
break; |
|
|
|
case PCF8584_FANSTAT_TYPE: |
|
envctrl_init_fanstat(pchild); |
|
i = pchild->total_chnls; |
|
break; |
|
|
|
case PCF8584_VOLTAGE_TYPE: |
|
if (pchild->i2ctype == I2C_ADC) { |
|
envctrl_init_adc(pchild,dp); |
|
} else { |
|
envctrl_init_voltage_status(pchild); |
|
} |
|
i = pchild->total_chnls; |
|
break; |
|
|
|
default: |
|
break; |
|
} |
|
} |
|
} |
|
|
|
/* Function Description: Search the child device list for a device. |
|
* Return : The i2c child if found. NULL otherwise. |
|
*/ |
|
static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type) |
|
{ |
|
int i, j; |
|
|
|
for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) { |
|
for (j = 0; j < PCF8584_MAX_CHANNELS; j++) { |
|
if (i2c_childlist[i].mon_type[j] == mon_type) { |
|
return (struct i2c_child_t *)(&(i2c_childlist[i])); |
|
} |
|
} |
|
} |
|
return NULL; |
|
} |
|
|
|
static void envctrl_do_shutdown(void) |
|
{ |
|
static int inprog = 0; |
|
|
|
if (inprog != 0) |
|
return; |
|
|
|
inprog = 1; |
|
printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n"); |
|
orderly_poweroff(true); |
|
} |
|
|
|
static struct task_struct *kenvctrld_task; |
|
|
|
static int kenvctrld(void *__unused) |
|
{ |
|
int poll_interval; |
|
int whichcpu; |
|
char tempbuf[10]; |
|
struct i2c_child_t *cputemp; |
|
|
|
if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) { |
|
printk(KERN_ERR PFX |
|
"kenvctrld unable to monitor CPU temp-- exiting\n"); |
|
return -ENODEV; |
|
} |
|
|
|
poll_interval = 5000; /* TODO env_mon_interval */ |
|
|
|
printk(KERN_INFO PFX "%s starting...\n", current->comm); |
|
for (;;) { |
|
msleep_interruptible(poll_interval); |
|
|
|
if (kthread_should_stop()) |
|
break; |
|
|
|
for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) { |
|
if (0 < envctrl_read_cpu_info(whichcpu, cputemp, |
|
ENVCTRL_CPUTEMP_MON, |
|
tempbuf)) { |
|
if (tempbuf[0] >= shutdown_temperature) { |
|
printk(KERN_CRIT |
|
"%s: WARNING: CPU%i temperature %i C meets or exceeds "\ |
|
"shutdown threshold %i C\n", |
|
current->comm, whichcpu, |
|
tempbuf[0], shutdown_temperature); |
|
envctrl_do_shutdown(); |
|
} |
|
} |
|
} |
|
} |
|
printk(KERN_INFO PFX "%s exiting...\n", current->comm); |
|
return 0; |
|
} |
|
|
|
static int envctrl_probe(struct platform_device *op) |
|
{ |
|
struct device_node *dp; |
|
int index, err; |
|
|
|
if (i2c) |
|
return -EINVAL; |
|
|
|
i2c = of_ioremap(&op->resource[0], 0, 0x2, DRIVER_NAME); |
|
if (!i2c) |
|
return -ENOMEM; |
|
|
|
index = 0; |
|
dp = op->dev.of_node->child; |
|
while (dp) { |
|
if (of_node_name_eq(dp, "gpio")) { |
|
i2c_childlist[index].i2ctype = I2C_GPIO; |
|
envctrl_init_i2c_child(dp, &(i2c_childlist[index++])); |
|
} else if (of_node_name_eq(dp, "adc")) { |
|
i2c_childlist[index].i2ctype = I2C_ADC; |
|
envctrl_init_i2c_child(dp, &(i2c_childlist[index++])); |
|
} |
|
|
|
dp = dp->sibling; |
|
} |
|
|
|
/* Set device address. */ |
|
writeb(CONTROL_PIN, i2c + PCF8584_CSR); |
|
writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA); |
|
|
|
/* Set system clock and SCL frequencies. */ |
|
writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR); |
|
writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA); |
|
|
|
/* Enable serial interface. */ |
|
writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR); |
|
udelay(200); |
|
|
|
/* Register the device as a minor miscellaneous device. */ |
|
err = misc_register(&envctrl_dev); |
|
if (err) { |
|
printk(KERN_ERR PFX "Unable to get misc minor %d\n", |
|
envctrl_dev.minor); |
|
goto out_iounmap; |
|
} |
|
|
|
/* Note above traversal routine post-incremented 'i' to accommodate |
|
* a next child device, so we decrement before reverse-traversal of |
|
* child devices. |
|
*/ |
|
printk(KERN_INFO PFX "Initialized "); |
|
for (--index; index >= 0; --index) { |
|
printk("[%s 0x%lx]%s", |
|
(I2C_ADC == i2c_childlist[index].i2ctype) ? "adc" : |
|
((I2C_GPIO == i2c_childlist[index].i2ctype) ? "gpio" : "unknown"), |
|
i2c_childlist[index].addr, (0 == index) ? "\n" : " "); |
|
} |
|
|
|
kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld"); |
|
if (IS_ERR(kenvctrld_task)) { |
|
err = PTR_ERR(kenvctrld_task); |
|
goto out_deregister; |
|
} |
|
|
|
return 0; |
|
|
|
out_deregister: |
|
misc_deregister(&envctrl_dev); |
|
out_iounmap: |
|
of_iounmap(&op->resource[0], i2c, 0x2); |
|
for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++) |
|
kfree(i2c_childlist[index].tables); |
|
|
|
return err; |
|
} |
|
|
|
static int envctrl_remove(struct platform_device *op) |
|
{ |
|
int index; |
|
|
|
kthread_stop(kenvctrld_task); |
|
|
|
of_iounmap(&op->resource[0], i2c, 0x2); |
|
misc_deregister(&envctrl_dev); |
|
|
|
for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++) |
|
kfree(i2c_childlist[index].tables); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct of_device_id envctrl_match[] = { |
|
{ |
|
.name = "i2c", |
|
.compatible = "i2cpcf,8584", |
|
}, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(of, envctrl_match); |
|
|
|
static struct platform_driver envctrl_driver = { |
|
.driver = { |
|
.name = DRIVER_NAME, |
|
.of_match_table = envctrl_match, |
|
}, |
|
.probe = envctrl_probe, |
|
.remove = envctrl_remove, |
|
}; |
|
|
|
module_platform_driver(envctrl_driver); |
|
|
|
MODULE_LICENSE("GPL");
|
|
|