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path: root/drivers/net/irda/mcp2120.c
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Diffstat (limited to 'drivers/net/irda/mcp2120.c')
-rw-r--r--drivers/net/irda/mcp2120.c240
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 0000000..5e6199e
--- /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);
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