mirror of
https://github.com/edk2-porting/linux-next.git
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44bdcb54df
Don't allow everybody to interact with hardware registers. Signed-off-by: Vasiliy Kulikov <segoon@openwall.com> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
653 lines
12 KiB
C
653 lines
12 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
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* License Terms: GNU General Public License v2
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*/
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/abx500.h>
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#include <linux/mfd/ab8500.h>
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static u32 debug_bank;
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static u32 debug_address;
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/**
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* struct ab8500_reg_range
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* @first: the first address of the range
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* @last: the last address of the range
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* @perm: access permissions for the range
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*/
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struct ab8500_reg_range {
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u8 first;
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u8 last;
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u8 perm;
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};
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/**
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* struct ab8500_i2c_ranges
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* @num_ranges: the number of ranges in the list
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* @bankid: bank identifier
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* @range: the list of register ranges
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*/
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struct ab8500_i2c_ranges {
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u8 num_ranges;
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u8 bankid;
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const struct ab8500_reg_range *range;
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};
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#define AB8500_NAME_STRING "ab8500"
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#define AB8500_NUM_BANKS 22
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#define AB8500_REV_REG 0x80
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static struct ab8500_i2c_ranges debug_ranges[AB8500_NUM_BANKS] = {
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[0x0] = {
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.num_ranges = 0,
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.range = 0,
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},
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[AB8500_SYS_CTRL1_BLOCK] = {
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.num_ranges = 3,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x02,
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},
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{
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.first = 0x42,
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.last = 0x42,
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},
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{
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.first = 0x80,
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.last = 0x81,
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},
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},
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},
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[AB8500_SYS_CTRL2_BLOCK] = {
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.num_ranges = 4,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x0D,
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},
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{
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.first = 0x0F,
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.last = 0x17,
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},
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{
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.first = 0x30,
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.last = 0x30,
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},
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{
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.first = 0x32,
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.last = 0x33,
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},
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},
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},
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[AB8500_REGU_CTRL1] = {
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.num_ranges = 3,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x00,
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},
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{
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.first = 0x03,
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.last = 0x10,
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},
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{
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.first = 0x80,
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.last = 0x84,
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},
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},
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},
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[AB8500_REGU_CTRL2] = {
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.num_ranges = 5,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x15,
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},
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{
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.first = 0x17,
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.last = 0x19,
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},
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{
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.first = 0x1B,
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.last = 0x1D,
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},
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{
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.first = 0x1F,
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.last = 0x22,
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},
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{
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.first = 0x40,
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.last = 0x44,
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},
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/* 0x80-0x8B is SIM registers and should
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* not be accessed from here */
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},
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},
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[AB8500_USB] = {
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.num_ranges = 2,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x80,
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.last = 0x83,
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},
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{
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.first = 0x87,
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.last = 0x8A,
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},
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},
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},
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[AB8500_TVOUT] = {
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.num_ranges = 9,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x12,
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},
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{
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.first = 0x15,
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.last = 0x17,
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},
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{
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.first = 0x19,
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.last = 0x21,
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},
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{
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.first = 0x27,
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.last = 0x2C,
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},
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{
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.first = 0x41,
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.last = 0x41,
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},
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{
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.first = 0x45,
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.last = 0x5B,
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},
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{
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.first = 0x5D,
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.last = 0x5D,
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},
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{
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.first = 0x69,
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.last = 0x69,
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},
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{
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.first = 0x80,
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.last = 0x81,
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},
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},
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},
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[AB8500_DBI] = {
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.num_ranges = 0,
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.range = NULL,
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},
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[AB8500_ECI_AV_ACC] = {
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.num_ranges = 1,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x80,
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.last = 0x82,
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},
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},
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},
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[0x9] = {
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.num_ranges = 0,
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.range = NULL,
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},
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[AB8500_GPADC] = {
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.num_ranges = 1,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x08,
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},
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},
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},
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[AB8500_CHARGER] = {
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.num_ranges = 8,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x03,
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},
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{
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.first = 0x05,
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.last = 0x05,
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},
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{
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.first = 0x40,
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.last = 0x40,
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},
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{
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.first = 0x42,
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.last = 0x42,
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},
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{
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.first = 0x44,
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.last = 0x44,
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},
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{
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.first = 0x50,
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.last = 0x55,
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},
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{
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.first = 0x80,
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.last = 0x82,
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},
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{
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.first = 0xC0,
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.last = 0xC2,
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},
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},
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},
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[AB8500_GAS_GAUGE] = {
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.num_ranges = 3,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x00,
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},
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{
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.first = 0x07,
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.last = 0x0A,
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},
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{
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.first = 0x10,
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.last = 0x14,
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},
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},
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},
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[AB8500_AUDIO] = {
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.num_ranges = 1,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x6F,
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},
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},
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},
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[AB8500_INTERRUPT] = {
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.num_ranges = 0,
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.range = NULL,
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},
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[AB8500_RTC] = {
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.num_ranges = 1,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x0F,
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},
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},
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},
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[AB8500_MISC] = {
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.num_ranges = 8,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x00,
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.last = 0x05,
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},
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{
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.first = 0x10,
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.last = 0x15,
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},
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{
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.first = 0x20,
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.last = 0x25,
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},
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{
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.first = 0x30,
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.last = 0x35,
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},
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{
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.first = 0x40,
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.last = 0x45,
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},
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{
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.first = 0x50,
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.last = 0x50,
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},
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{
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.first = 0x60,
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.last = 0x67,
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},
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{
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.first = 0x80,
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.last = 0x80,
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},
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},
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},
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[0x11] = {
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.num_ranges = 0,
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.range = NULL,
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},
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[0x12] = {
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.num_ranges = 0,
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.range = NULL,
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},
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[0x13] = {
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.num_ranges = 0,
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.range = NULL,
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},
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[0x14] = {
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.num_ranges = 0,
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.range = NULL,
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},
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[AB8500_OTP_EMUL] = {
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.num_ranges = 1,
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.range = (struct ab8500_reg_range[]) {
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{
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.first = 0x01,
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.last = 0x0F,
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},
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},
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},
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};
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static int ab8500_registers_print(struct seq_file *s, void *p)
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{
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struct device *dev = s->private;
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unsigned int i;
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u32 bank = debug_bank;
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seq_printf(s, AB8500_NAME_STRING " register values:\n");
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seq_printf(s, " bank %u:\n", bank);
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for (i = 0; i < debug_ranges[bank].num_ranges; i++) {
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u32 reg;
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for (reg = debug_ranges[bank].range[i].first;
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reg <= debug_ranges[bank].range[i].last;
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reg++) {
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u8 value;
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int err;
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err = abx500_get_register_interruptible(dev,
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(u8)bank, (u8)reg, &value);
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if (err < 0) {
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dev_err(dev, "ab->read fail %d\n", err);
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return err;
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}
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err = seq_printf(s, " [%u/0x%02X]: 0x%02X\n", bank,
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reg, value);
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if (err < 0) {
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dev_err(dev, "seq_printf overflow\n");
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/* Error is not returned here since
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* the output is wanted in any case */
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return 0;
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}
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}
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}
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return 0;
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}
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static int ab8500_registers_open(struct inode *inode, struct file *file)
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{
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return single_open(file, ab8500_registers_print, inode->i_private);
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}
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static const struct file_operations ab8500_registers_fops = {
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.open = ab8500_registers_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static int ab8500_bank_print(struct seq_file *s, void *p)
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{
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return seq_printf(s, "%d\n", debug_bank);
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}
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static int ab8500_bank_open(struct inode *inode, struct file *file)
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{
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return single_open(file, ab8500_bank_print, inode->i_private);
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}
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static ssize_t ab8500_bank_write(struct file *file,
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const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct device *dev = ((struct seq_file *)(file->private_data))->private;
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char buf[32];
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int buf_size;
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unsigned long user_bank;
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int err;
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/* Get userspace string and assure termination */
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buf_size = min(count, (sizeof(buf) - 1));
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if (copy_from_user(buf, user_buf, buf_size))
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return -EFAULT;
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buf[buf_size] = 0;
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err = strict_strtoul(buf, 0, &user_bank);
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if (err)
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return -EINVAL;
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if (user_bank >= AB8500_NUM_BANKS) {
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dev_err(dev, "debugfs error input > number of banks\n");
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return -EINVAL;
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}
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debug_bank = user_bank;
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return buf_size;
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}
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static int ab8500_address_print(struct seq_file *s, void *p)
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{
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return seq_printf(s, "0x%02X\n", debug_address);
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}
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static int ab8500_address_open(struct inode *inode, struct file *file)
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{
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return single_open(file, ab8500_address_print, inode->i_private);
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}
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static ssize_t ab8500_address_write(struct file *file,
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const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct device *dev = ((struct seq_file *)(file->private_data))->private;
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char buf[32];
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int buf_size;
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unsigned long user_address;
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int err;
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/* Get userspace string and assure termination */
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buf_size = min(count, (sizeof(buf) - 1));
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if (copy_from_user(buf, user_buf, buf_size))
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return -EFAULT;
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buf[buf_size] = 0;
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err = strict_strtoul(buf, 0, &user_address);
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if (err)
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return -EINVAL;
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if (user_address > 0xff) {
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dev_err(dev, "debugfs error input > 0xff\n");
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return -EINVAL;
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}
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debug_address = user_address;
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return buf_size;
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}
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static int ab8500_val_print(struct seq_file *s, void *p)
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{
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struct device *dev = s->private;
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int ret;
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u8 regvalue;
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ret = abx500_get_register_interruptible(dev,
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(u8)debug_bank, (u8)debug_address, ®value);
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if (ret < 0) {
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dev_err(dev, "abx500_get_reg fail %d, %d\n",
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ret, __LINE__);
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return -EINVAL;
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}
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seq_printf(s, "0x%02X\n", regvalue);
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return 0;
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}
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static int ab8500_val_open(struct inode *inode, struct file *file)
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{
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return single_open(file, ab8500_val_print, inode->i_private);
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}
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static ssize_t ab8500_val_write(struct file *file,
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const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct device *dev = ((struct seq_file *)(file->private_data))->private;
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char buf[32];
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int buf_size;
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unsigned long user_val;
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int err;
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/* Get userspace string and assure termination */
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buf_size = min(count, (sizeof(buf)-1));
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if (copy_from_user(buf, user_buf, buf_size))
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return -EFAULT;
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buf[buf_size] = 0;
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err = strict_strtoul(buf, 0, &user_val);
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if (err)
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return -EINVAL;
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if (user_val > 0xff) {
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dev_err(dev, "debugfs error input > 0xff\n");
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return -EINVAL;
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}
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err = abx500_set_register_interruptible(dev,
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(u8)debug_bank, debug_address, (u8)user_val);
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if (err < 0) {
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printk(KERN_ERR "abx500_set_reg failed %d, %d", err, __LINE__);
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return -EINVAL;
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}
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return buf_size;
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}
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static const struct file_operations ab8500_bank_fops = {
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.open = ab8500_bank_open,
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.write = ab8500_bank_write,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static const struct file_operations ab8500_address_fops = {
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.open = ab8500_address_open,
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.write = ab8500_address_write,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static const struct file_operations ab8500_val_fops = {
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.open = ab8500_val_open,
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.write = ab8500_val_write,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static struct dentry *ab8500_dir;
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static struct dentry *ab8500_reg_file;
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static struct dentry *ab8500_bank_file;
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static struct dentry *ab8500_address_file;
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|
static struct dentry *ab8500_val_file;
|
|
|
|
static int __devinit ab8500_debug_probe(struct platform_device *plf)
|
|
{
|
|
debug_bank = AB8500_MISC;
|
|
debug_address = AB8500_REV_REG & 0x00FF;
|
|
|
|
ab8500_dir = debugfs_create_dir(AB8500_NAME_STRING, NULL);
|
|
if (!ab8500_dir)
|
|
goto exit_no_debugfs;
|
|
|
|
ab8500_reg_file = debugfs_create_file("all-bank-registers",
|
|
S_IRUGO, ab8500_dir, &plf->dev, &ab8500_registers_fops);
|
|
if (!ab8500_reg_file)
|
|
goto exit_destroy_dir;
|
|
|
|
ab8500_bank_file = debugfs_create_file("register-bank",
|
|
(S_IRUGO | S_IWUSR), ab8500_dir, &plf->dev, &ab8500_bank_fops);
|
|
if (!ab8500_bank_file)
|
|
goto exit_destroy_reg;
|
|
|
|
ab8500_address_file = debugfs_create_file("register-address",
|
|
(S_IRUGO | S_IWUSR), ab8500_dir, &plf->dev,
|
|
&ab8500_address_fops);
|
|
if (!ab8500_address_file)
|
|
goto exit_destroy_bank;
|
|
|
|
ab8500_val_file = debugfs_create_file("register-value",
|
|
(S_IRUGO | S_IWUSR), ab8500_dir, &plf->dev, &ab8500_val_fops);
|
|
if (!ab8500_val_file)
|
|
goto exit_destroy_address;
|
|
|
|
return 0;
|
|
|
|
exit_destroy_address:
|
|
debugfs_remove(ab8500_address_file);
|
|
exit_destroy_bank:
|
|
debugfs_remove(ab8500_bank_file);
|
|
exit_destroy_reg:
|
|
debugfs_remove(ab8500_reg_file);
|
|
exit_destroy_dir:
|
|
debugfs_remove(ab8500_dir);
|
|
exit_no_debugfs:
|
|
dev_err(&plf->dev, "failed to create debugfs entries.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int __devexit ab8500_debug_remove(struct platform_device *plf)
|
|
{
|
|
debugfs_remove(ab8500_val_file);
|
|
debugfs_remove(ab8500_address_file);
|
|
debugfs_remove(ab8500_bank_file);
|
|
debugfs_remove(ab8500_reg_file);
|
|
debugfs_remove(ab8500_dir);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ab8500_debug_driver = {
|
|
.driver = {
|
|
.name = "ab8500-debug",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ab8500_debug_probe,
|
|
.remove = __devexit_p(ab8500_debug_remove)
|
|
};
|
|
|
|
static int __init ab8500_debug_init(void)
|
|
{
|
|
return platform_driver_register(&ab8500_debug_driver);
|
|
}
|
|
|
|
static void __exit ab8500_debug_exit(void)
|
|
{
|
|
platform_driver_unregister(&ab8500_debug_driver);
|
|
}
|
|
subsys_initcall(ab8500_debug_init);
|
|
module_exit(ab8500_debug_exit);
|
|
|
|
MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
|
|
MODULE_DESCRIPTION("AB8500 DEBUG");
|
|
MODULE_LICENSE("GPL v2");
|