aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/staging/kpc2000/kpc_i2c/i2c_driver.c')
-rw-r--r--drivers/staging/kpc2000/kpc_i2c/i2c_driver.c699
1 files changed, 0 insertions, 699 deletions
diff --git a/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c b/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c
deleted file mode 100644
index 0fb068b2408d..000000000000
--- a/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c
+++ /dev/null
@@ -1,699 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/* Copyright (c) 2014-2018 Daktronics,
- Matt Sickler <matt.sickler@daktronics.com>,
- Jordon Hofer <jordon.hofer@daktronics.com>
- Adapted i2c-i801.c for use with Kadoka hardware.
- Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
- Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker
- <mdsxyz123@yahoo.com>
- Copyright (C) 2007 - 2012 Jean Delvare <khali@linux-fr.org>
- Copyright (C) 2010 Intel Corporation,
- David Woodhouse <dwmw2@infradead.org>
-*/
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <asm/io.h>
-#include <linux/io-64-nonatomic-lo-hi.h>
-#include <linux/export.h>
-#include <linux/slab.h>
-#include <linux/platform_device.h>
-#include <linux/fs.h>
-#include <linux/rwsem.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include "../kpc.h"
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Matt.Sickler@Daktronics.com");
-MODULE_SOFTDEP("pre: i2c-dev");
-
-struct i2c_device {
- unsigned long smba;
- struct i2c_adapter adapter;
- struct platform_device *pldev;
- struct rw_semaphore rw_sem;
- unsigned int features;
-};
-
-/*****************************
- *** Part 1 - i2c Handlers ***
- *****************************/
-
-#define REG_SIZE 8
-
-/* I801 SMBus address offsets */
-#define SMBHSTSTS(p) ((0 * REG_SIZE) + (p)->smba)
-#define SMBHSTCNT(p) ((2 * REG_SIZE) + (p)->smba)
-#define SMBHSTCMD(p) ((3 * REG_SIZE) + (p)->smba)
-#define SMBHSTADD(p) ((4 * REG_SIZE) + (p)->smba)
-#define SMBHSTDAT0(p) ((5 * REG_SIZE) + (p)->smba)
-#define SMBHSTDAT1(p) ((6 * REG_SIZE) + (p)->smba)
-#define SMBBLKDAT(p) ((7 * REG_SIZE) + (p)->smba)
-#define SMBPEC(p) ((8 * REG_SIZE) + (p)->smba) /* ICH3 and later */
-#define SMBAUXSTS(p) ((12 * REG_SIZE) + (p)->smba) /* ICH4 and later */
-#define SMBAUXCTL(p) ((13 * REG_SIZE) + (p)->smba) /* ICH4 and later */
-
-/* PCI Address Constants */
-#define SMBBAR 4
-#define SMBHSTCFG 0x040
-
-/* Host configuration bits for SMBHSTCFG */
-#define SMBHSTCFG_HST_EN 1
-#define SMBHSTCFG_SMB_SMI_EN 2
-#define SMBHSTCFG_I2C_EN 4
-
-/* Auxiliary control register bits, ICH4+ only */
-#define SMBAUXCTL_CRC 1
-#define SMBAUXCTL_E32B 2
-
-/* kill bit for SMBHSTCNT */
-#define SMBHSTCNT_KILL 2
-
-/* Other settings */
-#define MAX_RETRIES 400
-#define ENABLE_INT9 0 /* set to 0x01 to enable - untested */
-
-/* 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 /* unimplemented */
-#define I801_BLOCK_DATA 0x14
-#define I801_I2C_BLOCK_DATA 0x18 /* ICH5 and later */
-#define I801_BLOCK_LAST 0x34
-#define I801_I2C_BLOCK_LAST 0x38 /* ICH5 and later */
-#define I801_START 0x40
-#define I801_PEC_EN 0x80 /* ICH3 and later */
-
-/* I801 Hosts Status register bits */
-#define SMBHSTSTS_BYTE_DONE 0x80
-#define SMBHSTSTS_INUSE_STS 0x40
-#define SMBHSTSTS_SMBALERT_STS 0x20
-#define SMBHSTSTS_FAILED 0x10
-#define SMBHSTSTS_BUS_ERR 0x08
-#define SMBHSTSTS_DEV_ERR 0x04
-#define SMBHSTSTS_INTR 0x02
-#define SMBHSTSTS_HOST_BUSY 0x01
-
-#define STATUS_FLAGS (SMBHSTSTS_BYTE_DONE | SMBHSTSTS_FAILED | SMBHSTSTS_BUS_ERR | SMBHSTSTS_DEV_ERR | SMBHSTSTS_INTR)
-
-/* Older devices have their ID defined in <linux/pci_ids.h> */
-#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_DH89XXCC_SMBUS 0x2330
-#define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS 0x3b30
-#define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS 0x8c22
-#define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS 0x9c22
-
-
-#define FEATURE_SMBUS_PEC (1 << 0)
-#define FEATURE_BLOCK_BUFFER (1 << 1)
-#define FEATURE_BLOCK_PROC (1 << 2)
-#define FEATURE_I2C_BLOCK_READ (1 << 3)
-/* Not really a feature, but it's convenient to handle it as such */
-#define FEATURE_IDF (1 << 15)
-
-static unsigned int disable_features;
-module_param(disable_features, uint, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(disable_features, "Disable selected driver features");
-
-// FIXME!
-#undef inb_p
-#define inb_p(a) readq((void*)a)
-#undef outb_p
-#define outb_p(d,a) writeq(d,(void*)a)
-
-/* 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 i2c_device *priv)
-{
- int status;
-
- dev_dbg(&priv->adapter.dev, "i801_check_pre\n");
-
- status = inb_p(SMBHSTSTS(priv));
- if (status & SMBHSTSTS_HOST_BUSY) {
- dev_err(&priv->adapter.dev, "SMBus is busy, can't use it! (status=%x)\n", status);
- return -EBUSY;
- }
-
- status &= STATUS_FLAGS;
- if (status) {
- //dev_dbg(&priv->adapter.dev, "Clearing status flags (%02x)\n", status);
- outb_p(status, SMBHSTSTS(priv));
- status = inb_p(SMBHSTSTS(priv)) & STATUS_FLAGS;
- if (status) {
- dev_err(&priv->adapter.dev, "Failed clearing status flags (%02x)\n", status);
- return -EBUSY;
- }
- }
- return 0;
-}
-
-/* Convert the status register to an error code, and clear it. */
-static int i801_check_post(struct i2c_device *priv, int status, int timeout)
-{
- int result = 0;
-
- dev_dbg(&priv->adapter.dev, "i801_check_post\n");
-
- /* If the SMBus is still busy, we give up */
- if (timeout) {
- dev_err(&priv->adapter.dev, "Transaction timeout\n");
- /* try to stop the current command */
- dev_dbg(&priv->adapter.dev, "Terminating the current operation\n");
- outb_p(inb_p(SMBHSTCNT(priv)) | SMBHSTCNT_KILL, SMBHSTCNT(priv));
- usleep_range(1000, 2000);
- outb_p(inb_p(SMBHSTCNT(priv)) & (~SMBHSTCNT_KILL), SMBHSTCNT(priv));
-
- /* Check if it worked */
- status = inb_p(SMBHSTSTS(priv));
- if ((status & SMBHSTSTS_HOST_BUSY) || !(status & SMBHSTSTS_FAILED)) {
- dev_err(&priv->adapter.dev, "Failed terminating the transaction\n");
- }
- outb_p(STATUS_FLAGS, SMBHSTSTS(priv));
- return -ETIMEDOUT;
- }
-
- if (status & SMBHSTSTS_FAILED) {
- result = -EIO;
- dev_err(&priv->adapter.dev, "Transaction failed\n");
- }
- if (status & SMBHSTSTS_DEV_ERR) {
- result = -ENXIO;
- dev_dbg(&priv->adapter.dev, "No response\n");
- }
- if (status & SMBHSTSTS_BUS_ERR) {
- result = -EAGAIN;
- dev_dbg(&priv->adapter.dev, "Lost arbitration\n");
- }
-
- if (result) {
- /* Clear error flags */
- outb_p(status & STATUS_FLAGS, SMBHSTSTS(priv));
- status = inb_p(SMBHSTSTS(priv)) & STATUS_FLAGS;
- if (status) {
- dev_warn(&priv->adapter.dev, "Failed clearing status flags at end of transaction (%02x)\n", status);
- }
- }
-
- return result;
-}
-
-static int i801_transaction(struct i2c_device *priv, int xact)
-{
- int status;
- int result;
- int timeout = 0;
-
- dev_dbg(&priv->adapter.dev, "i801_transaction\n");
-
- result = i801_check_pre(priv);
- if (result < 0) {
- return result;
- }
- /* the current contents of SMBHSTCNT can be overwritten, since PEC,
- * INTREN, SMBSCMD are passed in xact */
- outb_p(xact | I801_START, SMBHSTCNT(priv));
-
- /* We will always wait for a fraction of a second! */
- do {
- usleep_range(250, 500);
- status = inb_p(SMBHSTSTS(priv));
- } while ((status & SMBHSTSTS_HOST_BUSY) && (timeout++ < MAX_RETRIES));
-
- result = i801_check_post(priv, status, timeout > MAX_RETRIES);
- if (result < 0) {
- return result;
- }
-
- outb_p(SMBHSTSTS_INTR, SMBHSTSTS(priv));
- return 0;
-}
-
-/* wait for INTR bit as advised by Intel */
-static void i801_wait_hwpec(struct i2c_device *priv)
-{
- int timeout = 0;
- int status;
-
- dev_dbg(&priv->adapter.dev, "i801_wait_hwpec\n");
-
- do {
- usleep_range(250, 500);
- status = inb_p(SMBHSTSTS(priv));
- } while ((!(status & SMBHSTSTS_INTR)) && (timeout++ < MAX_RETRIES));
-
- if (timeout > MAX_RETRIES) {
- dev_dbg(&priv->adapter.dev, "PEC Timeout!\n");
- }
-
- outb_p(status, SMBHSTSTS(priv));
-}
-
-static int i801_block_transaction_by_block(struct i2c_device *priv, union i2c_smbus_data *data, char read_write, int hwpec)
-{
- int i, len;
- int status;
-
- dev_dbg(&priv->adapter.dev, "i801_block_transaction_by_block\n");
-
- inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
-
- /* Use 32-byte buffer to process this transaction */
- 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, I801_BLOCK_DATA | ENABLE_INT9 | I801_PEC_EN * hwpec);
- if (status) {
- return status;
- }
-
- if (read_write == I2C_SMBUS_READ) {
- 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 int i801_block_transaction_byte_by_byte(struct i2c_device *priv, union i2c_smbus_data *data, char read_write, int command, int hwpec)
-{
- int i, len;
- int smbcmd;
- int status;
- int result;
- int timeout;
-
- dev_dbg(&priv->adapter.dev, "i801_block_transaction_byte_by_byte\n");
-
- result = i801_check_pre(priv);
- if (result < 0) {
- return result;
- }
-
- len = data->block[0];
-
- if (read_write == I2C_SMBUS_WRITE) {
- outb_p(len, SMBHSTDAT0(priv));
- outb_p(data->block[1], SMBBLKDAT(priv));
- }
-
- for (i = 1; i <= len; i++) {
- if (i == len && read_write == I2C_SMBUS_READ) {
- if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
- smbcmd = I801_I2C_BLOCK_LAST;
- } else {
- smbcmd = I801_BLOCK_LAST;
- }
- } else {
- if (command == I2C_SMBUS_I2C_BLOCK_DATA && read_write == I2C_SMBUS_READ) {
- smbcmd = I801_I2C_BLOCK_DATA;
- } else {
- smbcmd = I801_BLOCK_DATA;
- }
- }
- outb_p(smbcmd | ENABLE_INT9, SMBHSTCNT(priv));
-
- if (i == 1) {
- outb_p(inb(SMBHSTCNT(priv)) | I801_START, SMBHSTCNT(priv));
- }
- /* We will always wait for a fraction of a second! */
- timeout = 0;
- do {
- usleep_range(250, 500);
- status = inb_p(SMBHSTSTS(priv));
- } while ((!(status & SMBHSTSTS_BYTE_DONE)) && (timeout++ < MAX_RETRIES));
-
- result = i801_check_post(priv, status, timeout > MAX_RETRIES);
- if (result < 0) {
- return result;
- }
- 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->adapter.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_INTR, SMBHSTSTS(priv));
- }
-
- return 0;
-}
-
-static int i801_set_block_buffer_mode(struct i2c_device *priv)
-{
- dev_dbg(&priv->adapter.dev, "i801_set_block_buffer_mode\n");
-
- outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
- if ((inb_p(SMBAUXCTL(priv)) & SMBAUXCTL_E32B) == 0) {
- return -EIO;
- }
- return 0;
-}
-
-/* Block transaction function */
-static int i801_block_transaction(struct i2c_device *priv, union i2c_smbus_data *data, char read_write, int command, int hwpec)
-{
- int result = 0;
- //unsigned char hostc;
-
- dev_dbg(&priv->adapter.dev, "i801_block_transaction\n");
-
- if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
- if (read_write == I2C_SMBUS_WRITE) {
- /* set I2C_EN bit in configuration register */
- //TODO: Figure out the right thing to do here...
- //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->adapter.dev, "I2C block read is unsupported!\n");
- return -EOPNOTSUPP;
- }
- }
-
- if (read_write == I2C_SMBUS_WRITE || command == I2C_SMBUS_I2C_BLOCK_DATA) {
- if (data->block[0] < 1) {
- data->block[0] = 1;
- }
- if (data->block[0] > I2C_SMBUS_BLOCK_MAX) {
- data->block[0] = I2C_SMBUS_BLOCK_MAX;
- }
- } else {
- data->block[0] = 32; /* max for SMBus block reads */
- }
-
- /* 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 && i801_set_block_buffer_mode(priv) == 0) {
- result = i801_block_transaction_by_block(priv, data, read_write, hwpec);
- } else {
- result = i801_block_transaction_byte_by_byte(priv, data, read_write, command, hwpec);
- }
- if (result == 0 && hwpec) {
- i801_wait_hwpec(priv);
- }
- if (command == I2C_SMBUS_I2C_BLOCK_DATA && read_write == I2C_SMBUS_WRITE) {
- /* restore saved configuration register value */
- //TODO: Figure out the right thing to do here...
- //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 = 0;
- struct i2c_device *priv = i2c_get_adapdata(adap);
-
- dev_dbg(&priv->adapter.dev, "i801_access (addr=%0d) flags=%x read_write=%x command=%x size=%x",
- addr, flags, read_write, command, size );
-
- 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:
- dev_dbg(&priv->adapter.dev, " [acc] SMBUS_QUICK\n");
- outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMBHSTADD(priv));
- xact = I801_QUICK;
- break;
- case I2C_SMBUS_BYTE:
- dev_dbg(&priv->adapter.dev, " [acc] SMBUS_BYTE\n");
-
- 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:
- dev_dbg(&priv->adapter.dev, " [acc] SMBUS_BYTE_DATA\n");
- 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:
- dev_dbg(&priv->adapter.dev, " [acc] SMBUS_WORD_DATA\n");
- 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_BLOCK_DATA:
- dev_dbg(&priv->adapter.dev, " [acc] SMBUS_BLOCK_DATA\n");
- outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMBHSTADD(priv));
- outb_p(command, SMBHSTCMD(priv));
- block = 1;
- break;
- case I2C_SMBUS_I2C_BLOCK_DATA:
- dev_dbg(&priv->adapter.dev, " [acc] SMBUS_I2C_BLOCK_DATA\n");
- /* NB: page 240 of ICH5 datasheet shows that the R/#W
- * bit should be cleared here, even when reading */
- outb_p((addr & 0x7f) << 1, 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;
- default:
- dev_dbg(&priv->adapter.dev, " [acc] Unsupported transaction %d\n", size);
- return -EOPNOTSUPP;
- }
-
- if (hwpec) { /* enable/disable hardware PEC */
- dev_dbg(&priv->adapter.dev, " [acc] hwpec: yes\n");
- outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_CRC, SMBAUXCTL(priv));
- } else {
- dev_dbg(&priv->adapter.dev, " [acc] hwpec: no\n");
- outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC), SMBAUXCTL(priv));
- }
-
- if (block) {
- //ret = 0;
- dev_dbg(&priv->adapter.dev, " [acc] block: yes\n");
- ret = i801_block_transaction(priv, data, read_write, size, hwpec);
- } else {
- dev_dbg(&priv->adapter.dev, " [acc] block: no\n");
- ret = i801_transaction(priv, xact | ENABLE_INT9);
- }
-
- /* 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) {
- dev_dbg(&priv->adapter.dev, " [acc] hwpec || block\n");
- outb_p(inb_p(SMBAUXCTL(priv)) & ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
- }
- if (block) {
- dev_dbg(&priv->adapter.dev, " [acc] block\n");
- return ret;
- }
- if (ret) {
- dev_dbg(&priv->adapter.dev, " [acc] ret %d\n", ret);
- return ret;
- }
- if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK)) {
- dev_dbg(&priv->adapter.dev, " [acc] I2C_SMBUS_WRITE || I801_QUICK -> ret 0\n");
- return 0;
- }
-
- switch (xact & 0x7f) {
- case I801_BYTE: /* Result put in SMBHSTDAT0 */
- case I801_BYTE_DATA:
- dev_dbg(&priv->adapter.dev, " [acc] I801_BYTE or I801_BYTE_DATA\n");
- data->byte = inb_p(SMBHSTDAT0(priv));
- break;
- case I801_WORD_DATA:
- dev_dbg(&priv->adapter.dev, " [acc] I801_WORD_DATA\n");
- data->word = inb_p(SMBHSTDAT0(priv)) + (inb_p(SMBHSTDAT1(priv)) << 8);
- break;
- }
- return 0;
-}
-
-
-
-static u32 i801_func(struct i2c_adapter *adapter)
-{
- struct i2c_device *priv = i2c_get_adapdata(adapter);
-
- /* original settings
- u32 f = I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
- I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
- I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
- ((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
- ((priv->features & FEATURE_I2C_BLOCK_READ) ?
- I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0);
- */
-
- // http://lxr.free-electrons.com/source/include/uapi/linux/i2c.h#L85
-
- u32 f =
- I2C_FUNC_I2C | /* 0x00000001 (I enabled this one) */
- !I2C_FUNC_10BIT_ADDR | /* 0x00000002 */
- !I2C_FUNC_PROTOCOL_MANGLING | /* 0x00000004 */
- ((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) | /* 0x00000008 */
- !I2C_FUNC_SMBUS_BLOCK_PROC_CALL | /* 0x00008000 */
- I2C_FUNC_SMBUS_QUICK | /* 0x00010000 */
- !I2C_FUNC_SMBUS_READ_BYTE | /* 0x00020000 */
- !I2C_FUNC_SMBUS_WRITE_BYTE | /* 0x00040000 */
- !I2C_FUNC_SMBUS_READ_BYTE_DATA | /* 0x00080000 */
- !I2C_FUNC_SMBUS_WRITE_BYTE_DATA | /* 0x00100000 */
- !I2C_FUNC_SMBUS_READ_WORD_DATA | /* 0x00200000 */
- !I2C_FUNC_SMBUS_WRITE_WORD_DATA | /* 0x00400000 */
- !I2C_FUNC_SMBUS_PROC_CALL | /* 0x00800000 */
- !I2C_FUNC_SMBUS_READ_BLOCK_DATA | /* 0x01000000 */
- !I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | /* 0x02000000 */
- ((priv->features & FEATURE_I2C_BLOCK_READ) ? I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0) | /* 0x04000000 */
- I2C_FUNC_SMBUS_WRITE_I2C_BLOCK | /* 0x08000000 */
-
- I2C_FUNC_SMBUS_BYTE | /* _READ_BYTE _WRITE_BYTE */
- I2C_FUNC_SMBUS_BYTE_DATA | /* _READ_BYTE_DATA _WRITE_BYTE_DATA */
- I2C_FUNC_SMBUS_WORD_DATA | /* _READ_WORD_DATA _WRITE_WORD_DATA */
- I2C_FUNC_SMBUS_BLOCK_DATA | /* _READ_BLOCK_DATA _WRITE_BLOCK_DATA */
- !I2C_FUNC_SMBUS_I2C_BLOCK | /* _READ_I2C_BLOCK _WRITE_I2C_BLOCK */
- !I2C_FUNC_SMBUS_EMUL; /* _QUICK _BYTE _BYTE_DATA _WORD_DATA _PROC_CALL _WRITE_BLOCK_DATA _I2C_BLOCK _PEC */
- return f;
-}
-
-static const struct i2c_algorithm smbus_algorithm = {
- .smbus_xfer = i801_access,
- .functionality = i801_func,
-};
-
-
-
-/********************************
- *** Part 2 - Driver Handlers ***
- ********************************/
-int pi2c_probe(struct platform_device *pldev)
-{
- int err;
- struct i2c_device *priv;
- struct resource *res;
-
- dev_dbg(&pldev->dev, "pi2c_probe(pldev = %p '%s')\n", pldev, pldev->name);
-
- priv = kzalloc(sizeof(struct i2c_device), GFP_KERNEL);
- if (!priv) {
- return -ENOMEM;
- }
-
- i2c_set_adapdata(&priv->adapter, priv);
- priv->adapter.owner = THIS_MODULE;
- priv->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
- priv->adapter.algo = &smbus_algorithm;
-
- res = platform_get_resource(pldev, IORESOURCE_MEM, 0);
- priv->smba = (unsigned long)ioremap_nocache(res->start, resource_size(res));
-
- priv->pldev = pldev;
- pldev->dev.platform_data = priv;
-
- priv->features |= FEATURE_IDF;
- priv->features |= FEATURE_I2C_BLOCK_READ;
- priv->features |= FEATURE_SMBUS_PEC;
- priv->features |= FEATURE_BLOCK_BUFFER;
-
- //init_MUTEX(&lddata->sem);
- init_rwsem(&priv->rw_sem);
-
- /* set up the sysfs linkage to our parent device */
- priv->adapter.dev.parent = &pldev->dev;
-
- /* Retry up to 3 times on lost arbitration */
- priv->adapter.retries = 3;
-
- //snprintf(priv->adapter.name, sizeof(priv->adapter.name), "Fake SMBus I801 adapter at %04lx", priv->smba);
- snprintf(priv->adapter.name, sizeof(priv->adapter.name), "Fake SMBus I801 adapter");
-
- err = i2c_add_adapter(&priv->adapter);
- if (err) {
- dev_err(&priv->adapter.dev, "Failed to add SMBus adapter\n");
- return err;
- }
-
- return 0;
-}
-
-int pi2c_remove(struct platform_device *pldev)
-{
- struct i2c_device *lddev;
- dev_dbg(&pldev->dev, "pi2c_remove(pldev = %p '%s')\n", pldev, pldev->name);
-
- lddev = (struct i2c_device *)pldev->dev.platform_data;
-
- i2c_del_adapter(&lddev->adapter);
-
- //TODO: Figure out the right thing to do here...
- //pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
- //pci_release_region(dev, SMBBAR);
- //pci_set_drvdata(dev, NULL);
-
- //cdev_del(&lddev->cdev);
- if(lddev != 0) {
- kfree(lddev);
- pldev->dev.platform_data = 0;
- }
-
- return 0;
-}
-
-struct platform_driver i2c_plat_driver_i = {
- .probe = pi2c_probe,
- .remove = pi2c_remove,
- .driver = {
- .name = KP_DRIVER_NAME_I2C,
- .owner = THIS_MODULE,
- },
-};
-
-module_platform_driver(i2c_plat_driver_i);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.