diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/irda/mcp2120.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/net/irda/mcp2120.c')
-rw-r--r-- | drivers/net/irda/mcp2120.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/drivers/net/irda/mcp2120.c b/drivers/net/irda/mcp2120.c new file mode 100644 index 00000000000..5e6199eeef4 --- /dev/null +++ b/drivers/net/irda/mcp2120.c @@ -0,0 +1,240 @@ +/********************************************************************* + * + * + * Filename: mcp2120.c + * Version: 1.0 + * Description: Implementation for the MCP2120 (Microchip) + * Status: Experimental. + * Author: Felix Tang (tangf@eyetap.org) + * Created at: Sun Mar 31 19:32:12 EST 2002 + * Based on code by: Dag Brattli <dagb@cs.uit.no> + * + * Copyright (c) 2002 Felix Tang, All Rights Reserved. + * + * 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 the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + ********************************************************************/ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/tty.h> +#include <linux/init.h> + +#include <net/irda/irda.h> +#include <net/irda/irda_device.h> + +static int mcp2120_reset(struct irda_task *task); +static void mcp2120_open(dongle_t *self, struct qos_info *qos); +static void mcp2120_close(dongle_t *self); +static int mcp2120_change_speed(struct irda_task *task); + +#define MCP2120_9600 0x87 +#define MCP2120_19200 0x8B +#define MCP2120_38400 0x85 +#define MCP2120_57600 0x83 +#define MCP2120_115200 0x81 + +#define MCP2120_COMMIT 0x11 + +static struct dongle_reg dongle = { + .type = IRDA_MCP2120_DONGLE, + .open = mcp2120_open, + .close = mcp2120_close, + .reset = mcp2120_reset, + .change_speed = mcp2120_change_speed, + .owner = THIS_MODULE, +}; + +static int __init mcp2120_init(void) +{ + return irda_device_register_dongle(&dongle); +} + +static void __exit mcp2120_cleanup(void) +{ + irda_device_unregister_dongle(&dongle); +} + +static void mcp2120_open(dongle_t *self, struct qos_info *qos) +{ + qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; + qos->min_turn_time.bits = 0x01; +} + +static void mcp2120_close(dongle_t *self) +{ + /* Power off dongle */ + /* reset and inhibit mcp2120 */ + self->set_dtr_rts(self->dev, TRUE, TRUE); + //self->set_dtr_rts(self->dev, FALSE, FALSE); +} + +/* + * Function mcp2120_change_speed (dev, speed) + * + * Set the speed for the MCP2120. + * + */ +static int mcp2120_change_speed(struct irda_task *task) +{ + dongle_t *self = (dongle_t *) task->instance; + __u32 speed = (__u32) task->param; + __u8 control[2]; + int ret = 0; + + self->speed_task = task; + + switch (task->state) { + case IRDA_TASK_INIT: + /* Need to reset the dongle and go to 9600 bps before + programming */ + //printk("Dmcp2120_change_speed irda_task_init\n"); + if (irda_task_execute(self, mcp2120_reset, NULL, task, + (void *) speed)) + { + /* Dongle need more time to reset */ + irda_task_next_state(task, IRDA_TASK_CHILD_WAIT); + + /* Give reset 1 sec to finish */ + ret = msecs_to_jiffies(1000); + } + break; + case IRDA_TASK_CHILD_WAIT: + IRDA_WARNING("%s(), resetting dongle timed out!\n", + __FUNCTION__); + ret = -1; + break; + case IRDA_TASK_CHILD_DONE: + /* Set DTR to enter command mode */ + self->set_dtr_rts(self->dev, TRUE, FALSE); + udelay(500); + + switch (speed) { + case 9600: + default: + control[0] = MCP2120_9600; + //printk("mcp2120 9600\n"); + break; + case 19200: + control[0] = MCP2120_19200; + //printk("mcp2120 19200\n"); + break; + case 34800: + control[0] = MCP2120_38400; + //printk("mcp2120 38400\n"); + break; + case 57600: + control[0] = MCP2120_57600; + //printk("mcp2120 57600\n"); + break; + case 115200: + control[0] = MCP2120_115200; + //printk("mcp2120 115200\n"); + break; + } + control[1] = MCP2120_COMMIT; + + /* Write control bytes */ + self->write(self->dev, control, 2); + + irda_task_next_state(task, IRDA_TASK_WAIT); + ret = msecs_to_jiffies(100); + //printk("mcp2120_change_speed irda_child_done\n"); + break; + case IRDA_TASK_WAIT: + /* Go back to normal mode */ + self->set_dtr_rts(self->dev, FALSE, FALSE); + irda_task_next_state(task, IRDA_TASK_DONE); + self->speed_task = NULL; + //printk("mcp2120_change_speed irda_task_wait\n"); + break; + default: + IRDA_ERROR("%s(), unknown state %d\n", + __FUNCTION__, task->state); + irda_task_next_state(task, IRDA_TASK_DONE); + self->speed_task = NULL; + ret = -1; + break; + } + return ret; +} + +/* + * Function mcp2120_reset (driver) + * + * This function resets the mcp2120 dongle. + * + * Info: -set RTS to reset mcp2120 + * -set DTR to set mcp2120 software command mode + * -mcp2120 defaults to 9600 baud after reset + * + * Algorithm: + * 0. Set RTS to reset mcp2120. + * 1. Clear RTS and wait for device reset timer of 30 ms (max). + * + */ + + +static int mcp2120_reset(struct irda_task *task) +{ + dongle_t *self = (dongle_t *) task->instance; + int ret = 0; + + self->reset_task = task; + + switch (task->state) { + case IRDA_TASK_INIT: + //printk("mcp2120_reset irda_task_init\n"); + /* Reset dongle by setting RTS*/ + self->set_dtr_rts(self->dev, TRUE, TRUE); + irda_task_next_state(task, IRDA_TASK_WAIT1); + ret = msecs_to_jiffies(50); + break; + case IRDA_TASK_WAIT1: + //printk("mcp2120_reset irda_task_wait1\n"); + /* clear RTS and wait for at least 30 ms. */ + self->set_dtr_rts(self->dev, FALSE, FALSE); + irda_task_next_state(task, IRDA_TASK_WAIT2); + ret = msecs_to_jiffies(50); + break; + case IRDA_TASK_WAIT2: + //printk("mcp2120_reset irda_task_wait2\n"); + /* Go back to normal mode */ + self->set_dtr_rts(self->dev, FALSE, FALSE); + irda_task_next_state(task, IRDA_TASK_DONE); + self->reset_task = NULL; + break; + default: + IRDA_ERROR("%s(), unknown state %d\n", + __FUNCTION__, task->state); + irda_task_next_state(task, IRDA_TASK_DONE); + self->reset_task = NULL; + ret = -1; + break; + } + return ret; +} + +MODULE_AUTHOR("Felix Tang <tangf@eyetap.org>"); +MODULE_DESCRIPTION("Microchip MCP2120"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("irda-dongle-9"); /* IRDA_MCP2120_DONGLE */ + +/* + * Function init_module (void) + * + * Initialize MCP2120 module + * + */ +module_init(mcp2120_init); + +/* + * Function cleanup_module (void) + * + * Cleanup MCP2120 module + * + */ +module_exit(mcp2120_cleanup); |