diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-parport.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-parport.c | 43 |
1 files changed, 40 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-parport.c b/drivers/i2c/busses/i2c-parport.c index 0d8998610c74..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 @@ -27,9 +27,11 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> +#include <linux/delay.h> #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 ------------------------------------------------------ */ @@ -38,6 +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; }; @@ -143,6 +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; @@ -154,8 +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; @@ -185,14 +203,29 @@ static void i2c_parport_attach (struct parport *port) parport_setsda(port, 1); parport_setscl(port, 1); /* Other init if needed (power on...) */ - if (adapter_parm[type].init.val) + if (adapter_parm[type].init.val) { line_set(port, 1, &adapter_parm[type].init); + /* Give powered devices some time to settle */ + msleep(100); + } if (i2c_bit_add_bus(&adapter->adapter) < 0) { printk(KERN_ERR "i2c-parport: Unable to register with I2C\n"); 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; @@ -213,6 +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...) */ |