diff options
| -rw-r--r-- | Documentation/i2c/busses/i2c-parport | 3 | ||||
| -rw-r--r-- | drivers/i2c/busses/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-parport.c | 37 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-parport.h | 4 |
4 files changed, 42 insertions, 3 deletions
diff --git a/Documentation/i2c/busses/i2c-parport b/Documentation/i2c/busses/i2c-parport index dceaba1ad930..2461c7b53b2c 100644 --- a/Documentation/i2c/busses/i2c-parport +++ b/Documentation/i2c/busses/i2c-parport @@ -29,6 +29,9 @@ can be easily added when needed. Earlier kernels defaulted to type=0 (Philips). But now, if the type parameter is missing, the driver will simply fail to initialize. +SMBus alert support is available on adapters which have this line properly +connected to the parallel port's interrupt pin. + Building your own adapter ------------------------- diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 7c382f9d81c3..4d65546ede44 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -581,6 +581,7 @@ config I2C_PARPORT tristate "Parallel port adapter" depends on PARPORT select I2C_ALGOBIT + select I2C_SMBUS help This supports parallel port I2C adapters such as the ones made by Philips or Velleman, Analog Devices evaluation boards, and more. diff --git a/drivers/i2c/busses/i2c-parport.c b/drivers/i2c/busses/i2c-parport.c index 056af1820993..220fca7f23a6 100644 --- a/drivers/i2c/busses/i2c-parport.c +++ b/drivers/i2c/busses/i2c-parport.c @@ -1,7 +1,7 @@ /* ------------------------------------------------------------------------ * * i2c-parport.c I2C bus over parallel port * * ------------------------------------------------------------------------ * - Copyright (C) 2003-2007 Jean Delvare <khali@linux-fr.org> + Copyright (C) 2003-2010 Jean Delvare <khali@linux-fr.org> Based on older i2c-philips-par.c driver Copyright (C) 1995-2000 Simon G. Vogl @@ -31,6 +31,7 @@ #include <linux/parport.h> #include <linux/i2c.h> #include <linux/i2c-algo-bit.h> +#include <linux/i2c-smbus.h> #include "i2c-parport.h" /* ----- Device list ------------------------------------------------------ */ @@ -39,6 +40,8 @@ struct i2c_par { struct pardevice *pdev; struct i2c_adapter adapter; struct i2c_algo_bit_data algo_data; + struct i2c_smbus_alert_setup alert_data; + struct i2c_client *ara; struct i2c_par *next; }; @@ -144,6 +147,19 @@ static struct i2c_algo_bit_data parport_algo_data = { /* ----- I2c and parallel port call-back functions and structures --------- */ +void i2c_parport_irq(void *data) +{ + struct i2c_par *adapter = data; + struct i2c_client *ara = adapter->ara; + + if (ara) { + dev_dbg(&ara->dev, "SMBus alert received\n"); + i2c_handle_smbus_alert(ara); + } else + dev_dbg(&adapter->adapter.dev, + "SMBus alert received but no ARA client!\n"); +} + static void i2c_parport_attach (struct parport *port) { struct i2c_par *adapter; @@ -155,8 +171,9 @@ static void i2c_parport_attach (struct parport *port) } pr_debug("i2c-parport: attaching to %s\n", port->name); + parport_disable_irq(port); adapter->pdev = parport_register_device(port, "i2c-parport", - NULL, NULL, NULL, PARPORT_FLAG_EXCL, NULL); + NULL, NULL, i2c_parport_irq, PARPORT_FLAG_EXCL, adapter); if (!adapter->pdev) { printk(KERN_ERR "i2c-parport: Unable to register with parport\n"); goto ERROR0; @@ -197,6 +214,18 @@ static void i2c_parport_attach (struct parport *port) goto ERROR1; } + /* Setup SMBus alert if supported */ + if (adapter_parm[type].smbus_alert) { + adapter->alert_data.alert_edge_triggered = 1; + adapter->ara = i2c_setup_smbus_alert(&adapter->adapter, + &adapter->alert_data); + if (adapter->ara) + parport_enable_irq(port); + else + printk(KERN_WARNING "i2c-parport: Failed to register " + "ARA client\n"); + } + /* Add the new adapter to the list */ adapter->next = adapter_list; adapter_list = adapter; @@ -217,6 +246,10 @@ static void i2c_parport_detach (struct parport *port) for (prev = NULL, adapter = adapter_list; adapter; prev = adapter, adapter = adapter->next) { if (adapter->pdev->port == port) { + if (adapter->ara) { + parport_disable_irq(port); + i2c_unregister_device(adapter->ara); + } i2c_del_adapter(&adapter->adapter); /* Un-init if needed (power off...) */ diff --git a/drivers/i2c/busses/i2c-parport.h b/drivers/i2c/busses/i2c-parport.h index ed69d846cb95..a9f66816546c 100644 --- a/drivers/i2c/busses/i2c-parport.h +++ b/drivers/i2c/busses/i2c-parport.h @@ -1,7 +1,7 @@ /* ------------------------------------------------------------------------ * * i2c-parport.h I2C bus over parallel port * * ------------------------------------------------------------------------ * - Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org> + Copyright (C) 2003-2010 Jean Delvare <khali@linux-fr.org> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -38,6 +38,7 @@ struct adapter_parm { struct lineop getsda; struct lineop getscl; struct lineop init; + unsigned int smbus_alert:1; }; static struct adapter_parm adapter_parm[] = { @@ -73,6 +74,7 @@ static struct adapter_parm adapter_parm[] = { .setscl = { 0x01, DATA, 1 }, .getsda = { 0x10, STAT, 1 }, .init = { 0xf0, DATA, 0 }, + .smbus_alert = 1, }, /* type 5: ADM1025, ADM1030 and ADM1031 evaluation boards */ { |