diff options
Diffstat (limited to 'drivers/staging/kpc2000/kpc2000_i2c.c')
-rw-r--r-- | drivers/staging/kpc2000/kpc2000_i2c.c | 731 |
1 files changed, 0 insertions, 731 deletions
diff --git a/drivers/staging/kpc2000/kpc2000_i2c.c b/drivers/staging/kpc2000/kpc2000_i2c.c deleted file mode 100644 index 14f7940fa4fb..000000000000 --- a/drivers/staging/kpc2000/kpc2000_i2c.c +++ /dev/null @@ -1,731 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * KPC2000 i2c driver - * - * Adapted i2c-i801.c for use with Kadoka hardware. - * - * Copyright (C) 1998 - 2002 - * Frodo Looijaard <frodol@dds.nl>, - * Philip Edelbrock <phil@netroedge.com>, - * 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> - * Copyright (C) 2014-2018 Daktronics - * Matt Sickler <matt.sickler@daktronics.com>, - * Jordon Hofer <jordon.hofer@daktronics.com> - */ -#include <linux/init.h> -#include <linux/module.h> -#include <linux/types.h> -#include <linux/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/delay.h> -#include <linux/i2c.h> -#include "kpc.h" - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Matt.Sickler@Daktronics.com"); - -struct kpc_i2c { - unsigned long smba; - struct i2c_adapter adapter; - 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 BIT(0) -#define FEATURE_BLOCK_BUFFER BIT(1) -#define FEATURE_BLOCK_PROC BIT(2) -#define FEATURE_I2C_BLOCK_READ BIT(3) -/* Not really a feature, but it's convenient to handle it as such */ -#define FEATURE_IDF BIT(15) - -// FIXME! -#undef inb_p -#define inb_p(a) readq((void __iomem *)a) -#undef outb_p -#define outb_p(d, a) writeq(d, (void __iomem *)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 kpc_i2c *priv) -{ - int status; - - 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) { - 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 kpc_i2c *priv, int status, int timeout) -{ - int result = 0; - - /* 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 kpc_i2c *priv, int xact) -{ - int status; - int result; - int timeout = 0; - - 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 kpc_i2c *priv) -{ - int timeout = 0; - int status; - - 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 kpc_i2c *priv, - union i2c_smbus_data *data, - char read_write, int hwpec) -{ - int i, len; - int status; - - 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 kpc_i2c *priv, - union i2c_smbus_data *data, - char read_write, int command, - int hwpec) -{ - int i, len; - int smbcmd; - int status; - int result; - int timeout; - - 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 kpc_i2c *priv) -{ - 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 kpc_i2c *priv, - union i2c_smbus_data *data, char read_write, - int command, int hwpec) -{ - int result = 0; - //unsigned char hostc; - - 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 kpc_i2c *priv = i2c_get_adapdata(adap); - - 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) { - 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; -} - -#define enable_flag(x) (x) -#define disable_flag(x) 0 -#define enable_flag_if(x, cond) ((cond) ? (x) : 0) - -static u32 i801_func(struct i2c_adapter *adapter) -{ - struct kpc_i2c *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 = - enable_flag(I2C_FUNC_I2C) | /* 0x00000001(I enabled this one) */ - disable_flag(I2C_FUNC_10BIT_ADDR) | /* 0x00000002 */ - disable_flag(I2C_FUNC_PROTOCOL_MANGLING) | /* 0x00000004 */ - enable_flag_if(I2C_FUNC_SMBUS_PEC, - priv->features & FEATURE_SMBUS_PEC) | - /* 0x00000008 */ - disable_flag(I2C_FUNC_SMBUS_BLOCK_PROC_CALL) | /* 0x00008000 */ - enable_flag(I2C_FUNC_SMBUS_QUICK) | /* 0x00010000 */ - disable_flag(I2C_FUNC_SMBUS_READ_BYTE) | /* 0x00020000 */ - disable_flag(I2C_FUNC_SMBUS_WRITE_BYTE) | /* 0x00040000 */ - disable_flag(I2C_FUNC_SMBUS_READ_BYTE_DATA) | /* 0x00080000 */ - disable_flag(I2C_FUNC_SMBUS_WRITE_BYTE_DATA) | /* 0x00100000 */ - disable_flag(I2C_FUNC_SMBUS_READ_WORD_DATA) | /* 0x00200000 */ - disable_flag(I2C_FUNC_SMBUS_WRITE_WORD_DATA) | /* 0x00400000 */ - disable_flag(I2C_FUNC_SMBUS_PROC_CALL) | /* 0x00800000 */ - disable_flag(I2C_FUNC_SMBUS_READ_BLOCK_DATA) | /* 0x01000000 */ - disable_flag(I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) | /* 0x02000000 */ - enable_flag_if(I2C_FUNC_SMBUS_READ_I2C_BLOCK, - priv->features & FEATURE_I2C_BLOCK_READ) | - /* 0x04000000 */ - enable_flag(I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) | /* 0x08000000 */ - - enable_flag(I2C_FUNC_SMBUS_BYTE) | /* _READ_BYTE _WRITE_BYTE */ - enable_flag(I2C_FUNC_SMBUS_BYTE_DATA) | /* _READ_BYTE_DATA - * _WRITE_BYTE_DATA - */ - enable_flag(I2C_FUNC_SMBUS_WORD_DATA) | /* _READ_WORD_DATA - * _WRITE_WORD_DATA - */ - enable_flag(I2C_FUNC_SMBUS_BLOCK_DATA) | /* _READ_BLOCK_DATA - * _WRITE_BLOCK_DATA - */ - disable_flag(I2C_FUNC_SMBUS_I2C_BLOCK) | /* _READ_I2C_BLOCK - * _WRITE_I2C_BLOCK - */ - disable_flag(I2C_FUNC_SMBUS_EMUL); /* _QUICK _BYTE - * _BYTE_DATA _WORD_DATA - * _PROC_CALL - * _WRITE_BLOCK_DATA - * _I2C_BLOCK _PEC - */ - return f; -} - -#undef enable_flag -#undef disable_flag -#undef enable_flag_if - -static const struct i2c_algorithm smbus_algorithm = { - .smbus_xfer = i801_access, - .functionality = i801_func, -}; - -/******************************** - *** Part 2 - Driver Handlers *** - ********************************/ -static int kpc_i2c_probe(struct platform_device *pldev) -{ - int err; - struct kpc_i2c *priv; - struct resource *res; - - priv = devm_kzalloc(&pldev->dev, sizeof(*priv), 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); - if (!res) - return -ENXIO; - - priv->smba = (unsigned long)devm_ioremap(&pldev->dev, - res->start, - resource_size(res)); - if (!priv->smba) - return -ENOMEM; - - platform_set_drvdata(pldev, 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); - - /* 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"); - - err = i2c_add_adapter(&priv->adapter); - if (err) { - dev_err(&priv->adapter.dev, "Failed to add SMBus adapter\n"); - return err; - } - - return 0; -} - -static int kpc_i2c_remove(struct platform_device *pldev) -{ - struct kpc_i2c *lddev; - - lddev = (struct kpc_i2c *)platform_get_drvdata(pldev); - - 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); - - return 0; -} - -static struct platform_driver kpc_i2c_driver = { - .probe = kpc_i2c_probe, - .remove = kpc_i2c_remove, - .driver = { - .name = KP_DRIVER_NAME_I2C, - }, -}; - -module_platform_driver(kpc_i2c_driver); |