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linux/linux-5.18.11/drivers/i2c/busses/i2c-i801.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker
<mdsxyz123@yahoo.com>
Copyright (C) 2007 - 2014 Jean Delvare <jdelvare@suse.de>
Copyright (C) 2010 Intel Corporation,
David Woodhouse <dwmw2@infradead.org>
*/
/*
* Supports the following Intel I/O Controller Hubs (ICH):
*
* I/O Block I2C
* region SMBus Block proc. block
* Chip name PCI ID size PEC buffer call read
* ---------------------------------------------------------------------------
* 82801AA (ICH) 0x2413 16 no no no no
* 82801AB (ICH0) 0x2423 16 no no no no
* 82801BA (ICH2) 0x2443 16 no no no no
* 82801CA (ICH3) 0x2483 32 soft no no no
* 82801DB (ICH4) 0x24c3 32 hard yes no no
* 82801E (ICH5) 0x24d3 32 hard yes yes yes
* 6300ESB 0x25a4 32 hard yes yes yes
* 82801F (ICH6) 0x266a 32 hard yes yes yes
* 6310ESB/6320ESB 0x269b 32 hard yes yes yes
* 82801G (ICH7) 0x27da 32 hard yes yes yes
* 82801H (ICH8) 0x283e 32 hard yes yes yes
* 82801I (ICH9) 0x2930 32 hard yes yes yes
* EP80579 (Tolapai) 0x5032 32 hard yes yes yes
* ICH10 0x3a30 32 hard yes yes yes
* ICH10 0x3a60 32 hard yes yes yes
* 5/3400 Series (PCH) 0x3b30 32 hard yes yes yes
* 6 Series (PCH) 0x1c22 32 hard yes yes yes
* Patsburg (PCH) 0x1d22 32 hard yes yes yes
* Patsburg (PCH) IDF 0x1d70 32 hard yes yes yes
* Patsburg (PCH) IDF 0x1d71 32 hard yes yes yes
* Patsburg (PCH) IDF 0x1d72 32 hard yes yes yes
* DH89xxCC (PCH) 0x2330 32 hard yes yes yes
* Panther Point (PCH) 0x1e22 32 hard yes yes yes
* Lynx Point (PCH) 0x8c22 32 hard yes yes yes
* Lynx Point-LP (PCH) 0x9c22 32 hard yes yes yes
* Avoton (SOC) 0x1f3c 32 hard yes yes yes
* Wellsburg (PCH) 0x8d22 32 hard yes yes yes
* Wellsburg (PCH) MS 0x8d7d 32 hard yes yes yes
* Wellsburg (PCH) MS 0x8d7e 32 hard yes yes yes
* Wellsburg (PCH) MS 0x8d7f 32 hard yes yes yes
* Coleto Creek (PCH) 0x23b0 32 hard yes yes yes
* Wildcat Point (PCH) 0x8ca2 32 hard yes yes yes
* Wildcat Point-LP (PCH) 0x9ca2 32 hard yes yes yes
* BayTrail (SOC) 0x0f12 32 hard yes yes yes
* Braswell (SOC) 0x2292 32 hard yes yes yes
* Sunrise Point-H (PCH) 0xa123 32 hard yes yes yes
* Sunrise Point-LP (PCH) 0x9d23 32 hard yes yes yes
* DNV (SOC) 0x19df 32 hard yes yes yes
* Emmitsburg (PCH) 0x1bc9 32 hard yes yes yes
* Broxton (SOC) 0x5ad4 32 hard yes yes yes
* Lewisburg (PCH) 0xa1a3 32 hard yes yes yes
* Lewisburg Supersku (PCH) 0xa223 32 hard yes yes yes
* Kaby Lake PCH-H (PCH) 0xa2a3 32 hard yes yes yes
* Gemini Lake (SOC) 0x31d4 32 hard yes yes yes
* Cannon Lake-H (PCH) 0xa323 32 hard yes yes yes
* Cannon Lake-LP (PCH) 0x9da3 32 hard yes yes yes
* Cedar Fork (PCH) 0x18df 32 hard yes yes yes
* Ice Lake-LP (PCH) 0x34a3 32 hard yes yes yes
* Ice Lake-N (PCH) 0x38a3 32 hard yes yes yes
* Comet Lake (PCH) 0x02a3 32 hard yes yes yes
* Comet Lake-H (PCH) 0x06a3 32 hard yes yes yes
* Elkhart Lake (PCH) 0x4b23 32 hard yes yes yes
* Tiger Lake-LP (PCH) 0xa0a3 32 hard yes yes yes
* Tiger Lake-H (PCH) 0x43a3 32 hard yes yes yes
* Jasper Lake (SOC) 0x4da3 32 hard yes yes yes
* Comet Lake-V (PCH) 0xa3a3 32 hard yes yes yes
* Alder Lake-S (PCH) 0x7aa3 32 hard yes yes yes
* Alder Lake-P (PCH) 0x51a3 32 hard yes yes yes
* Alder Lake-M (PCH) 0x54a3 32 hard yes yes yes
* Raptor Lake-S (PCH) 0x7a23 32 hard yes yes yes
*
* Features supported by this driver:
* Software PEC no
* Hardware PEC yes
* Block buffer yes
* Block process call transaction yes
* I2C block read transaction yes (doesn't use the block buffer)
* Slave mode no
* SMBus Host Notify yes
* Interrupt processing yes
*
* See the file Documentation/i2c/busses/i2c-i801.rst for details.
*/
#define DRV_NAME "i801_smbus"
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/dmi.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/completion.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/platform_data/itco_wdt.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
#include <linux/gpio/machine.h>
#include <linux/platform_data/i2c-mux-gpio.h>
#endif
/* I801 SMBus address offsets */
#define SMBHSTSTS(p) (0 + (p)->smba)
#define SMBHSTCNT(p) (2 + (p)->smba)
#define SMBHSTCMD(p) (3 + (p)->smba)
#define SMBHSTADD(p) (4 + (p)->smba)
#define SMBHSTDAT0(p) (5 + (p)->smba)
#define SMBHSTDAT1(p) (6 + (p)->smba)
#define SMBBLKDAT(p) (7 + (p)->smba)
#define SMBPEC(p) (8 + (p)->smba) /* ICH3 and later */
#define SMBAUXSTS(p) (12 + (p)->smba) /* ICH4 and later */
#define SMBAUXCTL(p) (13 + (p)->smba) /* ICH4 and later */
#define SMBSLVSTS(p) (16 + (p)->smba) /* ICH3 and later */
#define SMBSLVCMD(p) (17 + (p)->smba) /* ICH3 and later */
#define SMBNTFDADD(p) (20 + (p)->smba) /* ICH3 and later */
/* PCI Address Constants */
#define SMBBAR 4
#define SMBHSTCFG 0x040
#define TCOBASE 0x050
#define TCOCTL 0x054
#define SBREG_BAR 0x10
#define SBREG_SMBCTRL 0xc6000c
#define SBREG_SMBCTRL_DNV 0xcf000c
/* Host configuration bits for SMBHSTCFG */
#define SMBHSTCFG_HST_EN BIT(0)
#define SMBHSTCFG_SMB_SMI_EN BIT(1)
#define SMBHSTCFG_I2C_EN BIT(2)
#define SMBHSTCFG_SPD_WD BIT(4)
/* TCO configuration bits for TCOCTL */
#define TCOCTL_EN BIT(8)
/* Auxiliary status register bits, ICH4+ only */
#define SMBAUXSTS_CRCE BIT(0)
#define SMBAUXSTS_STCO BIT(1)
/* Auxiliary control register bits, ICH4+ only */
#define SMBAUXCTL_CRC BIT(0)
#define SMBAUXCTL_E32B BIT(1)
/* I801 command constants */
#define I801_QUICK 0x00
#define I801_BYTE 0x04
#define I801_BYTE_DATA 0x08
#define I801_WORD_DATA 0x0C
#define I801_PROC_CALL 0x10
#define I801_BLOCK_DATA 0x14
#define I801_I2C_BLOCK_DATA 0x18 /* ICH5 and later */
#define I801_BLOCK_PROC_CALL 0x1C
/* I801 Host Control register bits */
#define SMBHSTCNT_INTREN BIT(0)
#define SMBHSTCNT_KILL BIT(1)
#define SMBHSTCNT_LAST_BYTE BIT(5)
#define SMBHSTCNT_START BIT(6)
#define SMBHSTCNT_PEC_EN BIT(7) /* ICH3 and later */
/* I801 Hosts Status register bits */
#define SMBHSTSTS_BYTE_DONE BIT(7)
#define SMBHSTSTS_INUSE_STS BIT(6)
#define SMBHSTSTS_SMBALERT_STS BIT(5)
#define SMBHSTSTS_FAILED BIT(4)
#define SMBHSTSTS_BUS_ERR BIT(3)
#define SMBHSTSTS_DEV_ERR BIT(2)
#define SMBHSTSTS_INTR BIT(1)
#define SMBHSTSTS_HOST_BUSY BIT(0)
/* Host Notify Status register bits */
#define SMBSLVSTS_HST_NTFY_STS BIT(0)
/* Host Notify Command register bits */
#define SMBSLVCMD_SMBALERT_DISABLE BIT(2)
#define SMBSLVCMD_HST_NTFY_INTREN BIT(0)
#define STATUS_ERROR_FLAGS (SMBHSTSTS_FAILED | SMBHSTSTS_BUS_ERR | \
SMBHSTSTS_DEV_ERR)
#define STATUS_FLAGS (SMBHSTSTS_BYTE_DONE | SMBHSTSTS_INTR | \
STATUS_ERROR_FLAGS)
/* Older devices have their ID defined in <linux/pci_ids.h> */
#define PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS 0x02a3
#define PCI_DEVICE_ID_INTEL_COMETLAKE_H_SMBUS 0x06a3
#define PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS 0x0f12
#define PCI_DEVICE_ID_INTEL_CDF_SMBUS 0x18df
#define PCI_DEVICE_ID_INTEL_DNV_SMBUS 0x19df
#define PCI_DEVICE_ID_INTEL_EBG_SMBUS 0x1bc9
#define PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS 0x1c22
#define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS 0x1d22
/* Patsburg also has three 'Integrated Device Function' SMBus controllers */
#define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0 0x1d70
#define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1 0x1d71
#define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2 0x1d72
#define PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS 0x1e22
#define PCI_DEVICE_ID_INTEL_AVOTON_SMBUS 0x1f3c
#define PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS 0x2292
#define PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS 0x2330
#define PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS 0x23b0
#define PCI_DEVICE_ID_INTEL_GEMINILAKE_SMBUS 0x31d4
#define PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS 0x34a3
#define PCI_DEVICE_ID_INTEL_ICELAKE_N_SMBUS 0x38a3
#define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS 0x3b30
#define PCI_DEVICE_ID_INTEL_TIGERLAKE_H_SMBUS 0x43a3
#define PCI_DEVICE_ID_INTEL_ELKHART_LAKE_SMBUS 0x4b23
#define PCI_DEVICE_ID_INTEL_JASPER_LAKE_SMBUS 0x4da3
#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_P_SMBUS 0x51a3
#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_M_SMBUS 0x54a3
#define PCI_DEVICE_ID_INTEL_BROXTON_SMBUS 0x5ad4
#define PCI_DEVICE_ID_INTEL_RAPTOR_LAKE_S_SMBUS 0x7a23
#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_S_SMBUS 0x7aa3
#define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS 0x8c22
#define PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS 0x8ca2
#define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS 0x8d22
#define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0 0x8d7d
#define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1 0x8d7e
#define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2 0x8d7f
#define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS 0x9c22
#define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS 0x9ca2
#define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS 0x9d23
#define PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS 0x9da3
#define PCI_DEVICE_ID_INTEL_TIGERLAKE_LP_SMBUS 0xa0a3
#define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS 0xa123
#define PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS 0xa1a3
#define PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS 0xa223
#define PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS 0xa2a3
#define PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS 0xa323
#define PCI_DEVICE_ID_INTEL_COMETLAKE_V_SMBUS 0xa3a3
struct i801_mux_config {
char *gpio_chip;
unsigned values[3];
int n_values;
unsigned classes[3];
unsigned gpios[2]; /* Relative to gpio_chip->base */
int n_gpios;
};
struct i801_priv {
struct i2c_adapter adapter;
unsigned long smba;
unsigned char original_hstcfg;
unsigned char original_hstcnt;
unsigned char original_slvcmd;
struct pci_dev *pci_dev;
unsigned int features;
/* isr processing */
struct completion done;
u8 status;
/* Command state used by isr for byte-by-byte block transactions */
u8 cmd;
bool is_read;
int count;
int len;
u8 *data;
#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
const struct i801_mux_config *mux_drvdata;
struct platform_device *mux_pdev;
struct gpiod_lookup_table *lookup;
#endif
struct platform_device *tco_pdev;
/*
* If set to true the host controller registers are reserved for
* ACPI AML use. Protected by acpi_lock.
*/
bool acpi_reserved;
struct mutex acpi_lock;
};
#define FEATURE_SMBUS_PEC BIT(0)
#define FEATURE_BLOCK_BUFFER BIT(1)
#define FEATURE_BLOCK_PROC BIT(2)
#define FEATURE_I2C_BLOCK_READ BIT(3)
#define FEATURE_IRQ BIT(4)
#define FEATURE_HOST_NOTIFY BIT(5)
/* Not really a feature, but it's convenient to handle it as such */
#define FEATURE_IDF BIT(15)
#define FEATURE_TCO_SPT BIT(16)
#define FEATURE_TCO_CNL BIT(17)
static const char *i801_feature_names[] = {
"SMBus PEC",
"Block buffer",
"Block process call",
"I2C block read",
"Interrupt",
"SMBus Host Notify",
};
static unsigned int disable_features;
module_param(disable_features, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(disable_features, "Disable selected driver features:\n"
"\t\t 0x01 disable SMBus PEC\n"
"\t\t 0x02 disable the block buffer\n"
"\t\t 0x08 disable the I2C block read functionality\n"
"\t\t 0x10 don't use interrupts\n"
"\t\t 0x20 disable SMBus Host Notify ");
/* Make sure the SMBus host is ready to start transmitting.
Return 0 if it is, -EBUSY if it is not. */
static int i801_check_pre(struct i801_priv *priv)
{
int status;
status = inb_p(SMBHSTSTS(priv));
if (status & SMBHSTSTS_HOST_BUSY) {
pci_err(priv->pci_dev, "SMBus is busy, can't use it!\n");
return -EBUSY;
}
status &= STATUS_FLAGS;
if (status) {
pci_dbg(priv->pci_dev, "Clearing status flags (%02x)\n", status);
outb_p(status, SMBHSTSTS(priv));
}
/*
* Clear CRC status if needed.
* During normal operation, i801_check_post() takes care
* of it after every operation. We do it here only in case
* the hardware was already in this state when the driver
* started.
*/
if (priv->features & FEATURE_SMBUS_PEC) {
status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
if (status) {
pci_dbg(priv->pci_dev, "Clearing aux status flags (%02x)\n", status);
outb_p(status, SMBAUXSTS(priv));
}
}
return 0;
}
static int i801_check_post(struct i801_priv *priv, int status)
{
int result = 0;
/*
* If the SMBus is still busy, we give up
*/
if (unlikely(status < 0)) {
dev_err(&priv->pci_dev->dev, "Transaction timeout\n");
/* try to stop the current command */
dev_dbg(&priv->pci_dev->dev, "Terminating the current operation\n");
outb_p(SMBHSTCNT_KILL, SMBHSTCNT(priv));
usleep_range(1000, 2000);
outb_p(0, SMBHSTCNT(priv));
/* Check if it worked */
status = inb_p(SMBHSTSTS(priv));
if ((status & SMBHSTSTS_HOST_BUSY) ||
!(status & SMBHSTSTS_FAILED))
dev_err(&priv->pci_dev->dev,
"Failed terminating the transaction\n");
return -ETIMEDOUT;
}
if (status & SMBHSTSTS_FAILED) {
result = -EIO;
dev_err(&priv->pci_dev->dev, "Transaction failed\n");
}
if (status & SMBHSTSTS_DEV_ERR) {
/*
* This may be a PEC error, check and clear it.
*
* AUXSTS is handled differently from HSTSTS.
* For HSTSTS, i801_isr() or i801_wait_intr()
* has already cleared the error bits in hardware,
* and we are passed a copy of the original value
* in "status".
* For AUXSTS, the hardware register is left
* for us to handle here.
* This is asymmetric, slightly iffy, but safe,
* since all this code is serialized and the CRCE
* bit is harmless as long as it's cleared before
* the next operation.
*/
if ((priv->features & FEATURE_SMBUS_PEC) &&
(inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE)) {
outb_p(SMBAUXSTS_CRCE, SMBAUXSTS(priv));
result = -EBADMSG;
dev_dbg(&priv->pci_dev->dev, "PEC error\n");
} else {
result = -ENXIO;
dev_dbg(&priv->pci_dev->dev, "No response\n");
}
}
if (status & SMBHSTSTS_BUS_ERR) {
result = -EAGAIN;
dev_dbg(&priv->pci_dev->dev, "Lost arbitration\n");
}
return result;
}
/* Wait for BUSY being cleared and either INTR or an error flag being set */
static int i801_wait_intr(struct i801_priv *priv)
{
unsigned long timeout = jiffies + priv->adapter.timeout;
int status, busy;
do {
usleep_range(250, 500);
status = inb_p(SMBHSTSTS(priv));
busy = status & SMBHSTSTS_HOST_BUSY;
status &= STATUS_ERROR_FLAGS | SMBHSTSTS_INTR;
if (!busy && status)
return status;
} while (time_is_after_eq_jiffies(timeout));
return -ETIMEDOUT;
}
/* Wait for either BYTE_DONE or an error flag being set */
static int i801_wait_byte_done(struct i801_priv *priv)
{
unsigned long timeout = jiffies + priv->adapter.timeout;
int status;
do {
usleep_range(250, 500);
status = inb_p(SMBHSTSTS(priv));
if (status & (STATUS_ERROR_FLAGS | SMBHSTSTS_BYTE_DONE))
return status & STATUS_ERROR_FLAGS;
} while (time_is_after_eq_jiffies(timeout));
return -ETIMEDOUT;
}
static int i801_transaction(struct i801_priv *priv, int xact)
{
int status;
unsigned long result;
const struct i2c_adapter *adap = &priv->adapter;
status = i801_check_pre(priv);
if (status < 0)
return status;
if (priv->features & FEATURE_IRQ) {
reinit_completion(&priv->done);
outb_p(xact | SMBHSTCNT_INTREN | SMBHSTCNT_START,
SMBHSTCNT(priv));
result = wait_for_completion_timeout(&priv->done, adap->timeout);
return i801_check_post(priv, result ? priv->status : -ETIMEDOUT);
}
outb_p(xact | SMBHSTCNT_START, SMBHSTCNT(priv));
status = i801_wait_intr(priv);
return i801_check_post(priv, status);
}
static int i801_block_transaction_by_block(struct i801_priv *priv,
union i2c_smbus_data *data,
char read_write, int command)
{
int i, len, status, xact;
switch (command) {
case I2C_SMBUS_BLOCK_PROC_CALL:
xact = I801_BLOCK_PROC_CALL;
break;
case I2C_SMBUS_BLOCK_DATA:
xact = I801_BLOCK_DATA;
break;
default:
return -EOPNOTSUPP;
}
/* Set block buffer mode */
outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
if (read_write == I2C_SMBUS_WRITE) {
len = data->block[0];
outb_p(len, SMBHSTDAT0(priv));
for (i = 0; i < len; i++)
outb_p(data->block[i+1], SMBBLKDAT(priv));
}
status = i801_transaction(priv, xact);
if (status)
return status;
if (read_write == I2C_SMBUS_READ ||
command == I2C_SMBUS_BLOCK_PROC_CALL) {
len = inb_p(SMBHSTDAT0(priv));
if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
return -EPROTO;
data->block[0] = len;
for (i = 0; i < len; i++)
data->block[i + 1] = inb_p(SMBBLKDAT(priv));
}
return 0;
}
static void i801_isr_byte_done(struct i801_priv *priv)
{
if (priv->is_read) {
/* For SMBus block reads, length is received with first byte */
if (((priv->cmd & 0x1c) == I801_BLOCK_DATA) &&
(priv->count == 0)) {
priv->len = inb_p(SMBHSTDAT0(priv));
if (priv->len < 1 || priv->len > I2C_SMBUS_BLOCK_MAX) {
dev_err(&priv->pci_dev->dev,
"Illegal SMBus block read size %d\n",
priv->len);
/* FIXME: Recover */
priv->len = I2C_SMBUS_BLOCK_MAX;
}
priv->data[-1] = priv->len;
}
/* Read next byte */
if (priv->count < priv->len)
priv->data[priv->count++] = inb(SMBBLKDAT(priv));
else
dev_dbg(&priv->pci_dev->dev,
"Discarding extra byte on block read\n");
/* Set LAST_BYTE for last byte of read transaction */
if (priv->count == priv->len - 1)
outb_p(priv->cmd | SMBHSTCNT_LAST_BYTE,
SMBHSTCNT(priv));
} else if (priv->count < priv->len - 1) {
/* Write next byte, except for IRQ after last byte */
outb_p(priv->data[++priv->count], SMBBLKDAT(priv));
}
/* Clear BYTE_DONE to continue with next byte */
outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
}
static irqreturn_t i801_host_notify_isr(struct i801_priv *priv)
{
unsigned short addr;
addr = inb_p(SMBNTFDADD(priv)) >> 1;
/*
* With the tested platforms, reading SMBNTFDDAT (22 + (p)->smba)
* always returns 0. Our current implementation doesn't provide
* data, so we just ignore it.
*/
i2c_handle_smbus_host_notify(&priv->adapter, addr);
/* clear Host Notify bit and return */
outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
return IRQ_HANDLED;
}
/*
* There are three kinds of interrupts:
*
* 1) i801 signals transaction completion with one of these interrupts:
* INTR - Success
* DEV_ERR - Invalid command, NAK or communication timeout
* BUS_ERR - SMI# transaction collision
* FAILED - transaction was canceled due to a KILL request
* When any of these occur, update ->status and signal completion.
* ->status must be cleared before kicking off the next transaction.
*
* 2) For byte-by-byte (I2C read/write) transactions, one BYTE_DONE interrupt
* occurs for each byte of a byte-by-byte to prepare the next byte.
*
* 3) Host Notify interrupts
*/
static irqreturn_t i801_isr(int irq, void *dev_id)
{
struct i801_priv *priv = dev_id;
u16 pcists;
u8 status;
/* Confirm this is our interrupt */
pci_read_config_word(priv->pci_dev, PCI_STATUS, &pcists);
if (!(pcists & PCI_STATUS_INTERRUPT))
return IRQ_NONE;
if (priv->features & FEATURE_HOST_NOTIFY) {
status = inb_p(SMBSLVSTS(priv));
if (status & SMBSLVSTS_HST_NTFY_STS)
return i801_host_notify_isr(priv);
}
status = inb_p(SMBHSTSTS(priv));
if (status & SMBHSTSTS_BYTE_DONE)
i801_isr_byte_done(priv);
/*
* Clear remaining IRQ sources: Completion of last command, errors
* and the SMB_ALERT signal. SMB_ALERT status is set after signal
* assertion independently of the interrupt generation being blocked
* or not so clear it always when the status is set.
*/
status &= SMBHSTSTS_INTR | STATUS_ERROR_FLAGS | SMBHSTSTS_SMBALERT_STS;
if (status)
outb_p(status, SMBHSTSTS(priv));
status &= ~SMBHSTSTS_SMBALERT_STS; /* SMB_ALERT not reported */
/*
* Report transaction result.
* ->status must be cleared before the next transaction is started.
*/
if (status) {
priv->status = status;
complete(&priv->done);
}
return IRQ_HANDLED;
}
/*
* For "byte-by-byte" block transactions:
* I2C write uses cmd=I801_BLOCK_DATA, I2C_EN=1
* I2C read uses cmd=I801_I2C_BLOCK_DATA
*/
static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
union i2c_smbus_data *data,
char read_write, int command)
{
int i, len;
int smbcmd;
int status;
unsigned long result;
const struct i2c_adapter *adap = &priv->adapter;
if (command == I2C_SMBUS_BLOCK_PROC_CALL)
return -EOPNOTSUPP;
status = i801_check_pre(priv);
if (status < 0)
return status;
len = data->block[0];
if (read_write == I2C_SMBUS_WRITE) {
outb_p(len, SMBHSTDAT0(priv));
outb_p(data->block[1], SMBBLKDAT(priv));
}
if (command == I2C_SMBUS_I2C_BLOCK_DATA &&
read_write == I2C_SMBUS_READ)
smbcmd = I801_I2C_BLOCK_DATA;
else
smbcmd = I801_BLOCK_DATA;
if (priv->features & FEATURE_IRQ) {
priv->is_read = (read_write == I2C_SMBUS_READ);
if (len == 1 && priv->is_read)
smbcmd |= SMBHSTCNT_LAST_BYTE;
priv->cmd = smbcmd | SMBHSTCNT_INTREN;
priv->len = len;
priv->count = 0;
priv->data = &data->block[1];
reinit_completion(&priv->done);
outb_p(priv->cmd | SMBHSTCNT_START, SMBHSTCNT(priv));
result = wait_for_completion_timeout(&priv->done, adap->timeout);
return i801_check_post(priv, result ? priv->status : -ETIMEDOUT);
}
for (i = 1; i <= len; i++) {
if (i == len && read_write == I2C_SMBUS_READ)
smbcmd |= SMBHSTCNT_LAST_BYTE;
outb_p(smbcmd, SMBHSTCNT(priv));
if (i == 1)
outb_p(inb(SMBHSTCNT(priv)) | SMBHSTCNT_START,
SMBHSTCNT(priv));
status = i801_wait_byte_done(priv);
if (status)
goto exit;
if (i == 1 && read_write == I2C_SMBUS_READ
&& command != I2C_SMBUS_I2C_BLOCK_DATA) {
len = inb_p(SMBHSTDAT0(priv));
if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
dev_err(&priv->pci_dev->dev,
"Illegal SMBus block read size %d\n",
len);
/* Recover */
while (inb_p(SMBHSTSTS(priv)) &
SMBHSTSTS_HOST_BUSY)
outb_p(SMBHSTSTS_BYTE_DONE,
SMBHSTSTS(priv));
outb_p(SMBHSTSTS_INTR, SMBHSTSTS(priv));
return -EPROTO;
}
data->block[0] = len;
}
/* Retrieve/store value in SMBBLKDAT */
if (read_write == I2C_SMBUS_READ)
data->block[i] = inb_p(SMBBLKDAT(priv));
if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
outb_p(data->block[i+1], SMBBLKDAT(priv));
/* signals SMBBLKDAT ready */
outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
}
status = i801_wait_intr(priv);
exit:
return i801_check_post(priv, status);
}
/* Block transaction function */
static int i801_block_transaction(struct i801_priv *priv, union i2c_smbus_data *data,
char read_write, int command)
{
int result = 0;
unsigned char hostc;
if (read_write == I2C_SMBUS_READ && command == I2C_SMBUS_BLOCK_DATA)
data->block[0] = I2C_SMBUS_BLOCK_MAX;
else if (data->block[0] < 1 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
return -EPROTO;
if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
if (read_write == I2C_SMBUS_WRITE) {
/* set I2C_EN bit in configuration register */
pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
pci_write_config_byte(priv->pci_dev, SMBHSTCFG,
hostc | SMBHSTCFG_I2C_EN);
} else if (!(priv->features & FEATURE_I2C_BLOCK_READ)) {
dev_err(&priv->pci_dev->dev,
"I2C block read is unsupported!\n");
return -EOPNOTSUPP;
}
}
/* Experience has shown that the block buffer can only be used for
SMBus (not I2C) block transactions, even though the datasheet
doesn't mention this limitation. */
if ((priv->features & FEATURE_BLOCK_BUFFER) &&
command != I2C_SMBUS_I2C_BLOCK_DATA)
result = i801_block_transaction_by_block(priv, data,
read_write,
command);
else
result = i801_block_transaction_byte_by_byte(priv, data,
read_write,
command);
if (command == I2C_SMBUS_I2C_BLOCK_DATA
&& read_write == I2C_SMBUS_WRITE) {
/* restore saved configuration register value */
pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hostc);
}
return result;
}
/* Return negative errno on error. */
static s32 i801_access(struct i2c_adapter *adap, u16 addr,
unsigned short flags, char read_write, u8 command,
int size, union i2c_smbus_data *data)
{
int hwpec;
int block = 0;
int ret, xact;
struct i801_priv *priv = i2c_get_adapdata(adap);
mutex_lock(&priv->acpi_lock);
if (priv->acpi_reserved) {
mutex_unlock(&priv->acpi_lock);
return -EBUSY;
}
pm_runtime_get_sync(&priv->pci_dev->dev);
hwpec = (priv->features & FEATURE_SMBUS_PEC) && (flags & I2C_CLIENT_PEC)
&& size != I2C_SMBUS_QUICK
&& size != I2C_SMBUS_I2C_BLOCK_DATA;
switch (size) {
case I2C_SMBUS_QUICK:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
xact = I801_QUICK;
break;
case I2C_SMBUS_BYTE:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
if (read_write == I2C_SMBUS_WRITE)
outb_p(command, SMBHSTCMD(priv));
xact = I801_BYTE;
break;
case I2C_SMBUS_BYTE_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
if (read_write == I2C_SMBUS_WRITE)
outb_p(data->byte, SMBHSTDAT0(priv));
xact = I801_BYTE_DATA;
break;
case I2C_SMBUS_WORD_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
if (read_write == I2C_SMBUS_WRITE) {
outb_p(data->word & 0xff, SMBHSTDAT0(priv));
outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
}
xact = I801_WORD_DATA;
break;
case I2C_SMBUS_PROC_CALL:
outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
outb_p(data->word & 0xff, SMBHSTDAT0(priv));
outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
xact = I801_PROC_CALL;
read_write = I2C_SMBUS_READ;
break;
case I2C_SMBUS_BLOCK_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
block = 1;
break;
case I2C_SMBUS_I2C_BLOCK_DATA:
/*
* NB: page 240 of ICH5 datasheet shows that the R/#W
* bit should be cleared here, even when reading.
* However if SPD Write Disable is set (Lynx Point and later),
* the read will fail if we don't set the R/#W bit.
*/
outb_p(((addr & 0x7f) << 1) |
((priv->original_hstcfg & SMBHSTCFG_SPD_WD) ?
(read_write & 0x01) : 0),
SMBHSTADD(priv));
if (read_write == I2C_SMBUS_READ) {
/* NB: page 240 of ICH5 datasheet also shows
* that DATA1 is the cmd field when reading */
outb_p(command, SMBHSTDAT1(priv));
} else
outb_p(command, SMBHSTCMD(priv));
block = 1;
break;
case I2C_SMBUS_BLOCK_PROC_CALL:
/*
* Bit 0 of the slave address register always indicate a write
* command.
*/
outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
block = 1;
break;
default:
dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
size);
ret = -EOPNOTSUPP;
goto out;
}
if (hwpec) /* enable/disable hardware PEC */
outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_CRC, SMBAUXCTL(priv));
else
outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
SMBAUXCTL(priv));
if (block)
ret = i801_block_transaction(priv, data, read_write, size);
else
ret = i801_transaction(priv, xact);
/* Some BIOSes don't like it when PEC is enabled at reboot or resume
time, so we forcibly disable it after every transaction. Turn off
E32B for the same reason. */
if (hwpec || block)
outb_p(inb_p(SMBAUXCTL(priv)) &
~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
if (block)
goto out;
if (ret)
goto out;
if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
goto out;
switch (xact) {
case I801_BYTE: /* Result put in SMBHSTDAT0 */
case I801_BYTE_DATA:
data->byte = inb_p(SMBHSTDAT0(priv));
break;
case I801_WORD_DATA:
case I801_PROC_CALL:
data->word = inb_p(SMBHSTDAT0(priv)) +
(inb_p(SMBHSTDAT1(priv)) << 8);
break;
}
out:
/*
* Unlock the SMBus device for use by BIOS/ACPI,
* and clear status flags if not done already.
*/
outb_p(SMBHSTSTS_INUSE_STS | STATUS_FLAGS, SMBHSTSTS(priv));
pm_runtime_mark_last_busy(&priv->pci_dev->dev);
pm_runtime_put_autosuspend(&priv->pci_dev->dev);
mutex_unlock(&priv->acpi_lock);
return ret;
}
static u32 i801_func(struct i2c_adapter *adapter)
{
struct i801_priv *priv = i2c_get_adapdata(adapter);
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_PROC_CALL |
I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
((priv->features & FEATURE_BLOCK_PROC) ?
I2C_FUNC_SMBUS_BLOCK_PROC_CALL : 0) |
((priv->features & FEATURE_I2C_BLOCK_READ) ?
I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0) |
((priv->features & FEATURE_HOST_NOTIFY) ?
I2C_FUNC_SMBUS_HOST_NOTIFY : 0);
}
static void i801_enable_host_notify(struct i2c_adapter *adapter)
{
struct i801_priv *priv = i2c_get_adapdata(adapter);
if (!(priv->features & FEATURE_HOST_NOTIFY))
return;
/*
* Enable host notify interrupt and block the generation of interrupt
* from the SMB_ALERT signal because the driver does not support
* SMBus Alert.
*/
outb_p(SMBSLVCMD_HST_NTFY_INTREN | SMBSLVCMD_SMBALERT_DISABLE |
priv->original_slvcmd, SMBSLVCMD(priv));
/* clear Host Notify bit to allow a new notification */
outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
}
static void i801_disable_host_notify(struct i801_priv *priv)
{
if (!(priv->features & FEATURE_HOST_NOTIFY))
return;
outb_p(priv->original_slvcmd, SMBSLVCMD(priv));
}
static const struct i2c_algorithm smbus_algorithm = {
.smbus_xfer = i801_access,
.functionality = i801_func,
};
#define FEATURES_ICH5 (FEATURE_BLOCK_PROC | FEATURE_I2C_BLOCK_READ | \
FEATURE_IRQ | FEATURE_SMBUS_PEC | \
FEATURE_BLOCK_BUFFER | FEATURE_HOST_NOTIFY)
#define FEATURES_ICH4 (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER | \
FEATURE_HOST_NOTIFY)
static const struct pci_device_id i801_ids[] = {
{ PCI_DEVICE_DATA(INTEL, 82801AA_3, 0) },
{ PCI_DEVICE_DATA(INTEL, 82801AB_3, 0) },
{ PCI_DEVICE_DATA(INTEL, 82801BA_2, 0) },
{ PCI_DEVICE_DATA(INTEL, 82801CA_3, FEATURE_HOST_NOTIFY) },
{ PCI_DEVICE_DATA(INTEL, 82801DB_3, FEATURES_ICH4) },
{ PCI_DEVICE_DATA(INTEL, 82801EB_3, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, ESB_4, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, ICH6_16, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, ICH7_17, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, ESB2_17, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, ICH8_5, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, ICH9_6, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, EP80579_1, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, ICH10_4, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, ICH10_5, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, 5_3400_SERIES_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, COUGARPOINT_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, PATSBURG_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, PATSBURG_SMBUS_IDF0, FEATURES_ICH5 | FEATURE_IDF) },
{ PCI_DEVICE_DATA(INTEL, PATSBURG_SMBUS_IDF1, FEATURES_ICH5 | FEATURE_IDF) },
{ PCI_DEVICE_DATA(INTEL, PATSBURG_SMBUS_IDF2, FEATURES_ICH5 | FEATURE_IDF) },
{ PCI_DEVICE_DATA(INTEL, DH89XXCC_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, PANTHERPOINT_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, LYNXPOINT_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, LYNXPOINT_LP_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, AVOTON_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, WELLSBURG_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, WELLSBURG_SMBUS_MS0, FEATURES_ICH5 | FEATURE_IDF) },
{ PCI_DEVICE_DATA(INTEL, WELLSBURG_SMBUS_MS1, FEATURES_ICH5 | FEATURE_IDF) },
{ PCI_DEVICE_DATA(INTEL, WELLSBURG_SMBUS_MS2, FEATURES_ICH5 | FEATURE_IDF) },
{ PCI_DEVICE_DATA(INTEL, COLETOCREEK_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, GEMINILAKE_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, WILDCATPOINT_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, WILDCATPOINT_LP_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, BAYTRAIL_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, BRASWELL_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, SUNRISEPOINT_H_SMBUS, FEATURES_ICH5 | FEATURE_TCO_SPT) },
{ PCI_DEVICE_DATA(INTEL, SUNRISEPOINT_LP_SMBUS, FEATURES_ICH5 | FEATURE_TCO_SPT) },
{ PCI_DEVICE_DATA(INTEL, CDF_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, DNV_SMBUS, FEATURES_ICH5 | FEATURE_TCO_SPT) },
{ PCI_DEVICE_DATA(INTEL, EBG_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, BROXTON_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, LEWISBURG_SMBUS, FEATURES_ICH5 | FEATURE_TCO_SPT) },
{ PCI_DEVICE_DATA(INTEL, LEWISBURG_SSKU_SMBUS, FEATURES_ICH5 | FEATURE_TCO_SPT) },
{ PCI_DEVICE_DATA(INTEL, KABYLAKE_PCH_H_SMBUS, FEATURES_ICH5 | FEATURE_TCO_SPT) },
{ PCI_DEVICE_DATA(INTEL, CANNONLAKE_H_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, CANNONLAKE_LP_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, ICELAKE_LP_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, ICELAKE_N_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, COMETLAKE_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, COMETLAKE_H_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, COMETLAKE_V_SMBUS, FEATURES_ICH5 | FEATURE_TCO_SPT) },
{ PCI_DEVICE_DATA(INTEL, ELKHART_LAKE_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, TIGERLAKE_LP_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, TIGERLAKE_H_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, JASPER_LAKE_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, ALDER_LAKE_S_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, ALDER_LAKE_P_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, ALDER_LAKE_M_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, RAPTOR_LAKE_S_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, i801_ids);
#if defined CONFIG_X86 && defined CONFIG_DMI
static unsigned char apanel_addr;
/* Scan the system ROM for the signature "FJKEYINF" */
static __init const void __iomem *bios_signature(const void __iomem *bios)
{
ssize_t offset;
const unsigned char signature[] = "FJKEYINF";
for (offset = 0; offset < 0x10000; offset += 0x10) {
if (check_signature(bios + offset, signature,
sizeof(signature)-1))
return bios + offset;
}
return NULL;
}
static void __init input_apanel_init(void)
{
void __iomem *bios;
const void __iomem *p;
bios = ioremap(0xF0000, 0x10000); /* Can't fail */
p = bios_signature(bios);
if (p) {
/* just use the first address */
apanel_addr = readb(p + 8 + 3) >> 1;
}
iounmap(bios);
}
struct dmi_onboard_device_info {
const char *name;
u8 type;
unsigned short i2c_addr;
const char *i2c_type;
};
static const struct dmi_onboard_device_info dmi_devices[] = {
{ "Syleus", DMI_DEV_TYPE_OTHER, 0x73, "fscsyl" },
{ "Hermes", DMI_DEV_TYPE_OTHER, 0x73, "fscher" },
{ "Hades", DMI_DEV_TYPE_OTHER, 0x73, "fschds" },
};
static void dmi_check_onboard_device(u8 type, const char *name,
struct i2c_adapter *adap)
{
int i;
struct i2c_board_info info;
for (i = 0; i < ARRAY_SIZE(dmi_devices); i++) {
/* & ~0x80, ignore enabled/disabled bit */
if ((type & ~0x80) != dmi_devices[i].type)
continue;
if (strcasecmp(name, dmi_devices[i].name))
continue;
memset(&info, 0, sizeof(struct i2c_board_info));
info.addr = dmi_devices[i].i2c_addr;
strlcpy(info.type, dmi_devices[i].i2c_type, I2C_NAME_SIZE);
i2c_new_client_device(adap, &info);
break;
}
}
/* We use our own function to check for onboard devices instead of
dmi_find_device() as some buggy BIOS's have the devices we are interested
in marked as disabled */
static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap)
{
int i, count;
if (dm->type != 10)
return;
count = (dm->length - sizeof(struct dmi_header)) / 2;
for (i = 0; i < count; i++) {
const u8 *d = (char *)(dm + 1) + (i * 2);
const char *name = ((char *) dm) + dm->length;
u8 type = d[0];
u8 s = d[1];
if (!s)
continue;
s--;
while (s > 0 && name[0]) {
name += strlen(name) + 1;
s--;
}
if (name[0] == 0) /* Bogus string reference */
continue;
dmi_check_onboard_device(type, name, adap);
}
}
/* NOTE: Keep this list in sync with drivers/platform/x86/dell-smo8800.c */
static const char *const acpi_smo8800_ids[] = {
"SMO8800",
"SMO8801",
"SMO8810",
"SMO8811",
"SMO8820",
"SMO8821",
"SMO8830",
"SMO8831",
};
static acpi_status check_acpi_smo88xx_device(acpi_handle obj_handle,
u32 nesting_level,
void *context,
void **return_value)
{
struct acpi_device_info *info;
acpi_status status;
char *hid;
int i;
status = acpi_get_object_info(obj_handle, &info);
if (ACPI_FAILURE(status))
return AE_OK;
if (!(info->valid & ACPI_VALID_HID))
goto smo88xx_not_found;
hid = info->hardware_id.string;
if (!hid)
goto smo88xx_not_found;
i = match_string(acpi_smo8800_ids, ARRAY_SIZE(acpi_smo8800_ids), hid);
if (i < 0)
goto smo88xx_not_found;
kfree(info);
*return_value = NULL;
return AE_CTRL_TERMINATE;
smo88xx_not_found:
kfree(info);
return AE_OK;
}
static bool is_dell_system_with_lis3lv02d(void)
{
void *err = ERR_PTR(-ENOENT);
if (!dmi_match(DMI_SYS_VENDOR, "Dell Inc."))
return false;
/*
* Check that ACPI device SMO88xx is present and is functioning.
* Function acpi_get_devices() already filters all ACPI devices
* which are not present or are not functioning.
* ACPI device SMO88xx represents our ST microelectronics lis3lv02d
* accelerometer but unfortunately ACPI does not provide any other
* information (like I2C address).
*/
acpi_get_devices(NULL, check_acpi_smo88xx_device, NULL, &err);
return !IS_ERR(err);
}
/*
* Accelerometer's I2C address is not specified in DMI nor ACPI,
* so it is needed to define mapping table based on DMI product names.
*/
static const struct {
const char *dmi_product_name;
unsigned short i2c_addr;
} dell_lis3lv02d_devices[] = {
/*
* Dell platform team told us that these Latitude devices have
* ST microelectronics accelerometer at I2C address 0x29.
*/
{ "Latitude E5250", 0x29 },
{ "Latitude E5450", 0x29 },
{ "Latitude E5550", 0x29 },
{ "Latitude E6440", 0x29 },
{ "Latitude E6440 ATG", 0x29 },
{ "Latitude E6540", 0x29 },
/*
* Additional individual entries were added after verification.
*/
{ "Latitude 5480", 0x29 },
{ "Vostro V131", 0x1d },
};
static void register_dell_lis3lv02d_i2c_device(struct i801_priv *priv)
{
struct i2c_board_info info;
const char *dmi_product_name;
int i;
dmi_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
for (i = 0; i < ARRAY_SIZE(dell_lis3lv02d_devices); ++i) {
if (strcmp(dmi_product_name,
dell_lis3lv02d_devices[i].dmi_product_name) == 0)
break;
}
if (i == ARRAY_SIZE(dell_lis3lv02d_devices)) {
dev_warn(&priv->pci_dev->dev,
"Accelerometer lis3lv02d is present on SMBus but its"
" address is unknown, skipping registration\n");
return;
}
memset(&info, 0, sizeof(struct i2c_board_info));
info.addr = dell_lis3lv02d_devices[i].i2c_addr;
strlcpy(info.type, "lis3lv02d", I2C_NAME_SIZE);
i2c_new_client_device(&priv->adapter, &info);
}
/* Register optional slaves */
static void i801_probe_optional_slaves(struct i801_priv *priv)
{
/* Only register slaves on main SMBus channel */
if (priv->features & FEATURE_IDF)
return;
if (apanel_addr) {
struct i2c_board_info info = {
.addr = apanel_addr,
.type = "fujitsu_apanel",
};
i2c_new_client_device(&priv->adapter, &info);
}
if (dmi_name_in_vendors("FUJITSU"))
dmi_walk(dmi_check_onboard_devices, &priv->adapter);
if (is_dell_system_with_lis3lv02d())
register_dell_lis3lv02d_i2c_device(priv);
/* Instantiate SPD EEPROMs unless the SMBus is multiplexed */
#if IS_ENABLED(CONFIG_I2C_MUX_GPIO)
if (!priv->mux_drvdata)
#endif
i2c_register_spd(&priv->adapter);
}
#else
static void __init input_apanel_init(void) {}
static void i801_probe_optional_slaves(struct i801_priv *priv) {}
#endif /* CONFIG_X86 && CONFIG_DMI */
#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
static struct i801_mux_config i801_mux_config_asus_z8_d12 = {
.gpio_chip = "gpio_ich",
.values = { 0x02, 0x03 },
.n_values = 2,
.classes = { I2C_CLASS_SPD, I2C_CLASS_SPD },
.gpios = { 52, 53 },
.n_gpios = 2,
};
static struct i801_mux_config i801_mux_config_asus_z8_d18 = {
.gpio_chip = "gpio_ich",
.values = { 0x02, 0x03, 0x01 },
.n_values = 3,
.classes = { I2C_CLASS_SPD, I2C_CLASS_SPD, I2C_CLASS_SPD },
.gpios = { 52, 53 },
.n_gpios = 2,
};
static const struct dmi_system_id mux_dmi_table[] = {
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8NA-D6(C)"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)E-D12(X)"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8NH-D12"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8PH-D12/IFB"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8NR-D12"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)H-D12"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8PG-D18"),
},
.driver_data = &i801_mux_config_asus_z8_d18,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8PE-D18"),
},
.driver_data = &i801_mux_config_asus_z8_d18,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8PS-D12"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{ }
};
/* Setup multiplexing if needed */
static void i801_add_mux(struct i801_priv *priv)
{
struct device *dev = &priv->adapter.dev;
const struct i801_mux_config *mux_config;
struct i2c_mux_gpio_platform_data gpio_data;
struct gpiod_lookup_table *lookup;
int i;
if (!priv->mux_drvdata)
return;
mux_config = priv->mux_drvdata;
/* Prepare the platform data */
memset(&gpio_data, 0, sizeof(struct i2c_mux_gpio_platform_data));
gpio_data.parent = priv->adapter.nr;
gpio_data.values = mux_config->values;
gpio_data.n_values = mux_config->n_values;
gpio_data.classes = mux_config->classes;
gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
/* Register GPIO descriptor lookup table */
lookup = devm_kzalloc(dev,
struct_size(lookup, table, mux_config->n_gpios + 1),
GFP_KERNEL);
if (!lookup)
return;
lookup->dev_id = "i2c-mux-gpio";
for (i = 0; i < mux_config->n_gpios; i++)
lookup->table[i] = GPIO_LOOKUP(mux_config->gpio_chip,
mux_config->gpios[i], "mux", 0);
gpiod_add_lookup_table(lookup);
priv->lookup = lookup;
/*
* Register the mux device, we use PLATFORM_DEVID_NONE here
* because since we are referring to the GPIO chip by name we are
* anyways in deep trouble if there is more than one of these
* devices, and there should likely only be one platform controller
* hub.
*/
priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
PLATFORM_DEVID_NONE, &gpio_data,
sizeof(struct i2c_mux_gpio_platform_data));
if (IS_ERR(priv->mux_pdev)) {
gpiod_remove_lookup_table(lookup);
dev_err(dev, "Failed to register i2c-mux-gpio device\n");
}
}
static void i801_del_mux(struct i801_priv *priv)
{
platform_device_unregister(priv->mux_pdev);
gpiod_remove_lookup_table(priv->lookup);
}
static unsigned int i801_get_adapter_class(struct i801_priv *priv)
{
const struct dmi_system_id *id;
const struct i801_mux_config *mux_config;
unsigned int class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
int i;
id = dmi_first_match(mux_dmi_table);
if (id) {
/* Remove branch classes from trunk */
mux_config = id->driver_data;
for (i = 0; i < mux_config->n_values; i++)
class &= ~mux_config->classes[i];
/* Remember for later */
priv->mux_drvdata = mux_config;
}
return class;
}
#else
static inline void i801_add_mux(struct i801_priv *priv) { }
static inline void i801_del_mux(struct i801_priv *priv) { }
static inline unsigned int i801_get_adapter_class(struct i801_priv *priv)
{
return I2C_CLASS_HWMON | I2C_CLASS_SPD;
}
#endif
static struct platform_device *
i801_add_tco_spt(struct i801_priv *priv, struct pci_dev *pci_dev,
struct resource *tco_res)
{
static const struct itco_wdt_platform_data pldata = {
.name = "Intel PCH",
.version = 4,
};
struct resource *res;
unsigned int devfn;
u64 base64_addr;
u32 base_addr;
u8 hidden;
/*
* We must access the NO_REBOOT bit over the Primary to Sideband
* bridge (P2SB). The BIOS prevents the P2SB device from being
* enumerated by the PCI subsystem, so we need to unhide/hide it
* to lookup the P2SB BAR.
*/
pci_lock_rescan_remove();
devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 1);
/* Unhide the P2SB device, if it is hidden */
pci_bus_read_config_byte(pci_dev->bus, devfn, 0xe1, &hidden);
if (hidden)
pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x0);
pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR, &base_addr);
base64_addr = base_addr & 0xfffffff0;
pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR + 0x4, &base_addr);
base64_addr |= (u64)base_addr << 32;
/* Hide the P2SB device, if it was hidden before */
if (hidden)
pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, hidden);
pci_unlock_rescan_remove();
res = &tco_res[1];
if (pci_dev->device == PCI_DEVICE_ID_INTEL_DNV_SMBUS)
res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL_DNV;
else
res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL;
res->end = res->start + 3;
res->flags = IORESOURCE_MEM;
return platform_device_register_resndata(&pci_dev->dev, "iTCO_wdt", -1,
tco_res, 2, &pldata, sizeof(pldata));
}
static struct platform_device *
i801_add_tco_cnl(struct i801_priv *priv, struct pci_dev *pci_dev,
struct resource *tco_res)
{
static const struct itco_wdt_platform_data pldata = {
.name = "Intel PCH",
.version = 6,
};
return platform_device_register_resndata(&pci_dev->dev, "iTCO_wdt", -1,
tco_res, 1, &pldata, sizeof(pldata));
}
static void i801_add_tco(struct i801_priv *priv)
{
struct pci_dev *pci_dev = priv->pci_dev;
struct resource tco_res[2], *res;
u32 tco_base, tco_ctl;
/* If we have ACPI based watchdog use that instead */
if (acpi_has_watchdog())
return;
if (!(priv->features & (FEATURE_TCO_SPT | FEATURE_TCO_CNL)))
return;
pci_read_config_dword(pci_dev, TCOBASE, &tco_base);
pci_read_config_dword(pci_dev, TCOCTL, &tco_ctl);
if (!(tco_ctl & TCOCTL_EN))
return;
memset(tco_res, 0, sizeof(tco_res));
/*
* Always populate the main iTCO IO resource here. The second entry
* for NO_REBOOT MMIO is filled by the SPT specific function.
*/
res = &tco_res[0];
res->start = tco_base & ~1;
res->end = res->start + 32 - 1;
res->flags = IORESOURCE_IO;
if (priv->features & FEATURE_TCO_CNL)
priv->tco_pdev = i801_add_tco_cnl(priv, pci_dev, tco_res);
else
priv->tco_pdev = i801_add_tco_spt(priv, pci_dev, tco_res);
if (IS_ERR(priv->tco_pdev))
dev_warn(&pci_dev->dev, "failed to create iTCO device\n");
}
#ifdef CONFIG_ACPI
static bool i801_acpi_is_smbus_ioport(const struct i801_priv *priv,
acpi_physical_address address)
{
return address >= priv->smba &&
address <= pci_resource_end(priv->pci_dev, SMBBAR);
}
static acpi_status
i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
u64 *value, void *handler_context, void *region_context)
{
struct i801_priv *priv = handler_context;
struct pci_dev *pdev = priv->pci_dev;
acpi_status status;
/*
* Once BIOS AML code touches the OpRegion we warn and inhibit any
* further access from the driver itself. This device is now owned
* by the system firmware.
*/
mutex_lock(&priv->acpi_lock);
if (!priv->acpi_reserved && i801_acpi_is_smbus_ioport(priv, address)) {
priv->acpi_reserved = true;
dev_warn(&pdev->dev, "BIOS is accessing SMBus registers\n");
dev_warn(&pdev->dev, "Driver SMBus register access inhibited\n");
/*
* BIOS is accessing the host controller so prevent it from
* suspending automatically from now on.
*/
pm_runtime_get_sync(&pdev->dev);
}
if ((function & ACPI_IO_MASK) == ACPI_READ)
status = acpi_os_read_port(address, (u32 *)value, bits);
else
status = acpi_os_write_port(address, (u32)*value, bits);
mutex_unlock(&priv->acpi_lock);
return status;
}
static int i801_acpi_probe(struct i801_priv *priv)
{
acpi_handle ah = ACPI_HANDLE(&priv->pci_dev->dev);
acpi_status status;
status = acpi_install_address_space_handler(ah, ACPI_ADR_SPACE_SYSTEM_IO,
i801_acpi_io_handler, NULL, priv);
if (ACPI_SUCCESS(status))
return 0;
return acpi_check_resource_conflict(&priv->pci_dev->resource[SMBBAR]);
}
static void i801_acpi_remove(struct i801_priv *priv)
{
acpi_handle ah = ACPI_HANDLE(&priv->pci_dev->dev);
acpi_remove_address_space_handler(ah, ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler);
}
#else
static inline int i801_acpi_probe(struct i801_priv *priv) { return 0; }
static inline void i801_acpi_remove(struct i801_priv *priv) { }
#endif
static void i801_setup_hstcfg(struct i801_priv *priv)
{
unsigned char hstcfg = priv->original_hstcfg;
hstcfg &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */
hstcfg |= SMBHSTCFG_HST_EN;
pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hstcfg);
}
static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int err, i;
struct i801_priv *priv;
priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
i2c_set_adapdata(&priv->adapter, priv);
priv->adapter.owner = THIS_MODULE;
priv->adapter.class = i801_get_adapter_class(priv);
priv->adapter.algo = &smbus_algorithm;
priv->adapter.dev.parent = &dev->dev;
ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&dev->dev));
priv->adapter.retries = 3;
mutex_init(&priv->acpi_lock);
priv->pci_dev = dev;
priv->features = id->driver_data;
/* Disable features on user request */
for (i = 0; i < ARRAY_SIZE(i801_feature_names); i++) {
if (priv->features & disable_features & (1 << i))
dev_notice(&dev->dev, "%s disabled by user\n",
i801_feature_names[i]);
}
priv->features &= ~disable_features;
err = pcim_enable_device(dev);
if (err) {
dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
err);
return err;
}
pcim_pin_device(dev);
/* Determine the address of the SMBus area */
priv->smba = pci_resource_start(dev, SMBBAR);
if (!priv->smba) {
dev_err(&dev->dev,
"SMBus base address uninitialized, upgrade BIOS\n");
return -ENODEV;
}
if (i801_acpi_probe(priv))
return -ENODEV;
err = pcim_iomap_regions(dev, 1 << SMBBAR, DRV_NAME);
if (err) {
dev_err(&dev->dev,
"Failed to request SMBus region 0x%lx-0x%Lx\n",
priv->smba,
(unsigned long long)pci_resource_end(dev, SMBBAR));
i801_acpi_remove(priv);
return err;
}
pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &priv->original_hstcfg);
i801_setup_hstcfg(priv);
if (!(priv->original_hstcfg & SMBHSTCFG_HST_EN))
dev_info(&dev->dev, "Enabling SMBus device\n");
if (priv->original_hstcfg & SMBHSTCFG_SMB_SMI_EN) {
dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n");
/* Disable SMBus interrupt feature if SMBus using SMI# */
priv->features &= ~FEATURE_IRQ;
}
if (priv->original_hstcfg & SMBHSTCFG_SPD_WD)
dev_info(&dev->dev, "SPD Write Disable is set\n");
/* Clear special mode bits */
if (priv->features & (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER))
outb_p(inb_p(SMBAUXCTL(priv)) &
~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
/* Remember original Interrupt and Host Notify settings */
priv->original_hstcnt = inb_p(SMBHSTCNT(priv)) & ~SMBHSTCNT_KILL;
if (priv->features & FEATURE_HOST_NOTIFY)
priv->original_slvcmd = inb_p(SMBSLVCMD(priv));
/* Default timeout in interrupt mode: 200 ms */
priv->adapter.timeout = HZ / 5;
if (dev->irq == IRQ_NOTCONNECTED)
priv->features &= ~FEATURE_IRQ;
if (priv->features & FEATURE_IRQ) {
u16 pcists;
/* Complain if an interrupt is already pending */
pci_read_config_word(priv->pci_dev, PCI_STATUS, &pcists);
if (pcists & PCI_STATUS_INTERRUPT)
dev_warn(&dev->dev, "An interrupt is pending!\n");
}
if (priv->features & FEATURE_IRQ) {
init_completion(&priv->done);
err = devm_request_irq(&dev->dev, dev->irq, i801_isr,
IRQF_SHARED, DRV_NAME, priv);
if (err) {
dev_err(&dev->dev, "Failed to allocate irq %d: %d\n",
dev->irq, err);
priv->features &= ~FEATURE_IRQ;
}
}
dev_info(&dev->dev, "SMBus using %s\n",
priv->features & FEATURE_IRQ ? "PCI interrupt" : "polling");
i801_add_tco(priv);
snprintf(priv->adapter.name, sizeof(priv->adapter.name),
"SMBus I801 adapter at %04lx", priv->smba);
err = i2c_add_adapter(&priv->adapter);
if (err) {
i801_acpi_remove(priv);
return err;
}
i801_enable_host_notify(&priv->adapter);
i801_probe_optional_slaves(priv);
/* We ignore errors - multiplexing is optional */
i801_add_mux(priv);
pci_set_drvdata(dev, priv);
dev_pm_set_driver_flags(&dev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
pm_runtime_set_autosuspend_delay(&dev->dev, 1000);
pm_runtime_use_autosuspend(&dev->dev);
pm_runtime_put_autosuspend(&dev->dev);
pm_runtime_allow(&dev->dev);
return 0;
}
static void i801_remove(struct pci_dev *dev)
{
struct i801_priv *priv = pci_get_drvdata(dev);
outb_p(priv->original_hstcnt, SMBHSTCNT(priv));
i801_disable_host_notify(priv);
i801_del_mux(priv);
i2c_del_adapter(&priv->adapter);
i801_acpi_remove(priv);
pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
platform_device_unregister(priv->tco_pdev);
/* if acpi_reserved is set then usage_count is incremented already */
if (!priv->acpi_reserved)
pm_runtime_get_noresume(&dev->dev);
/*
* do not call pci_disable_device(dev) since it can cause hard hangs on
* some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010)
*/
}
static void i801_shutdown(struct pci_dev *dev)
{
struct i801_priv *priv = pci_get_drvdata(dev);
/* Restore config registers to avoid hard hang on some systems */
outb_p(priv->original_hstcnt, SMBHSTCNT(priv));
i801_disable_host_notify(priv);
pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
}
#ifdef CONFIG_PM_SLEEP
static int i801_suspend(struct device *dev)
{
struct i801_priv *priv = dev_get_drvdata(dev);
outb_p(priv->original_hstcnt, SMBHSTCNT(priv));
pci_write_config_byte(priv->pci_dev, SMBHSTCFG, priv->original_hstcfg);
return 0;
}
static int i801_resume(struct device *dev)
{
struct i801_priv *priv = dev_get_drvdata(dev);
i801_setup_hstcfg(priv);
i801_enable_host_notify(&priv->adapter);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(i801_pm_ops, i801_suspend, i801_resume);
static struct pci_driver i801_driver = {
.name = DRV_NAME,
.id_table = i801_ids,
.probe = i801_probe,
.remove = i801_remove,
.shutdown = i801_shutdown,
.driver = {
.pm = &i801_pm_ops,
},
};
static int __init i2c_i801_init(void)
{
if (dmi_name_in_vendors("FUJITSU"))
input_apanel_init();
return pci_register_driver(&i801_driver);
}
static void __exit i2c_i801_exit(void)
{
pci_unregister_driver(&i801_driver);
}
MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("I801 SMBus driver");
MODULE_LICENSE("GPL");
module_init(i2c_i801_init);
module_exit(i2c_i801_exit);