diff --git a/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c b/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c index 0fb068b2408dc41bacf086be6d3f80858df22477..6dda4eb6de7517efc55f7c2f5cb17ce2d6591988 100644 --- a/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c +++ b/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c @@ -1,14 +1,14 @@ // SPDX-License-Identifier: GPL-2.0+ /* Copyright (c) 2014-2018 Daktronics, - Matt Sickler , - Jordon Hofer + Matt Sickler , + Jordon Hofer Adapted i2c-i801.c for use with Kadoka hardware. Copyright (c) 1998 - 2002 Frodo Looijaard , Philip Edelbrock , and Mark D. Studebaker Copyright (C) 2007 - 2012 Jean Delvare Copyright (C) 2010 Intel Corporation, - David Woodhouse + David Woodhouse */ #include #include @@ -29,11 +29,11 @@ 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; + unsigned long smba; + struct i2c_adapter adapter; + struct platform_device *pldev; + struct rw_semaphore rw_sem; + unsigned int features; }; /***************************** @@ -134,479 +134,479 @@ MODULE_PARM_DESC(disable_features, "Disable selected driver features"); 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; + 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; + 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; + 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)); + 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; + 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; + 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; + 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; + 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; + 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; + 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, + .smbus_xfer = i801_access, + .functionality = i801_func, }; @@ -616,84 +616,84 @@ static const struct i2c_algorithm smbus_algorithm = { ********************************/ 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 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 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, - }, + .probe = pi2c_probe, + .remove = pi2c_remove, + .driver = { + .name = KP_DRIVER_NAME_I2C, + .owner = THIS_MODULE, + }, }; module_platform_driver(i2c_plat_driver_i);