X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fnet%2Firda%2Fmcp2120-sir.c;fp=kernel%2Fdrivers%2Fnet%2Firda%2Fmcp2120-sir.c;h=2e33f91bfe8f60dc261698028b0e85122d167849;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/net/irda/mcp2120-sir.c b/kernel/drivers/net/irda/mcp2120-sir.c new file mode 100644 index 000000000..2e33f91bf --- /dev/null +++ b/kernel/drivers/net/irda/mcp2120-sir.c @@ -0,0 +1,224 @@ +/********************************************************************* + * + * + * 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 + * + * 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 +#include +#include + +#include + +#include "sir-dev.h" + +static int mcp2120_reset(struct sir_dev *dev); +static int mcp2120_open(struct sir_dev *dev); +static int mcp2120_close(struct sir_dev *dev); +static int mcp2120_change_speed(struct sir_dev *dev, unsigned speed); + +#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_driver mcp2120 = { + .owner = THIS_MODULE, + .driver_name = "Microchip MCP2120", + .type = IRDA_MCP2120_DONGLE, + .open = mcp2120_open, + .close = mcp2120_close, + .reset = mcp2120_reset, + .set_speed = mcp2120_change_speed, +}; + +static int __init mcp2120_sir_init(void) +{ + return irda_register_dongle(&mcp2120); +} + +static void __exit mcp2120_sir_cleanup(void) +{ + irda_unregister_dongle(&mcp2120); +} + +static int mcp2120_open(struct sir_dev *dev) +{ + struct qos_info *qos = &dev->qos; + + /* seems no explicit power-on required here and reset switching it on anyway */ + + qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; + qos->min_turn_time.bits = 0x01; + irda_qos_bits_to_value(qos); + + return 0; +} + +static int mcp2120_close(struct sir_dev *dev) +{ + /* Power off dongle */ + /* reset and inhibit mcp2120 */ + sirdev_set_dtr_rts(dev, TRUE, TRUE); + // sirdev_set_dtr_rts(dev, FALSE, FALSE); + + return 0; +} + +/* + * Function mcp2120_change_speed (dev, speed) + * + * Set the speed for the MCP2120. + * + */ + +#define MCP2120_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED+1) + +static int mcp2120_change_speed(struct sir_dev *dev, unsigned speed) +{ + unsigned state = dev->fsm.substate; + unsigned delay = 0; + u8 control[2]; + static int ret = 0; + + switch (state) { + case SIRDEV_STATE_DONGLE_SPEED: + /* Set DTR to enter command mode */ + sirdev_set_dtr_rts(dev, TRUE, FALSE); + udelay(500); + + ret = 0; + switch (speed) { + default: + speed = 9600; + ret = -EINVAL; + /* fall through */ + case 9600: + 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 */ + sirdev_raw_write(dev, control, 2); + dev->speed = speed; + + state = MCP2120_STATE_WAIT_SPEED; + delay = 100; + //printk("mcp2120_change_speed: dongle_speed\n"); + break; + + case MCP2120_STATE_WAIT_SPEED: + /* Go back to normal mode */ + sirdev_set_dtr_rts(dev, FALSE, FALSE); + //printk("mcp2120_change_speed: mcp_wait\n"); + break; + + default: + net_err_ratelimited("%s(), undefine state %d\n", + __func__, state); + ret = -EINVAL; + break; + } + dev->fsm.substate = state; + return (delay > 0) ? delay : 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). + * + */ + +#define MCP2120_STATE_WAIT1_RESET (SIRDEV_STATE_DONGLE_RESET+1) +#define MCP2120_STATE_WAIT2_RESET (SIRDEV_STATE_DONGLE_RESET+2) + +static int mcp2120_reset(struct sir_dev *dev) +{ + unsigned state = dev->fsm.substate; + unsigned delay = 0; + int ret = 0; + + switch (state) { + case SIRDEV_STATE_DONGLE_RESET: + //printk("mcp2120_reset: dongle_reset\n"); + /* Reset dongle by setting RTS*/ + sirdev_set_dtr_rts(dev, TRUE, TRUE); + state = MCP2120_STATE_WAIT1_RESET; + delay = 50; + break; + + case MCP2120_STATE_WAIT1_RESET: + //printk("mcp2120_reset: mcp2120_wait1\n"); + /* clear RTS and wait for at least 30 ms. */ + sirdev_set_dtr_rts(dev, FALSE, FALSE); + state = MCP2120_STATE_WAIT2_RESET; + delay = 50; + break; + + case MCP2120_STATE_WAIT2_RESET: + //printk("mcp2120_reset mcp2120_wait2\n"); + /* Go back to normal mode */ + sirdev_set_dtr_rts(dev, FALSE, FALSE); + break; + + default: + net_err_ratelimited("%s(), undefined state %d\n", + __func__, state); + ret = -EINVAL; + break; + } + dev->fsm.substate = state; + return (delay > 0) ? delay : ret; +} + +MODULE_AUTHOR("Felix Tang "); +MODULE_DESCRIPTION("Microchip MCP2120"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("irda-dongle-9"); /* IRDA_MCP2120_DONGLE */ + +module_init(mcp2120_sir_init); +module_exit(mcp2120_sir_cleanup);