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/*
* Driver for Feature Integration Technology Inc. (aka Fintek) LPC CIR
*
* Copyright (C) 2011 Jarod Wilson <jarod@redhat.com>
*
* Special thanks to Fintek for providing hardware and spec sheets.
* This driver is based upon the nuvoton, ite and ene drivers for
* similar hardware.
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <linux/spinlock.h>
#include <linux/ioctl.h>
/* platform driver name to register */
#define FINTEK_DRIVER_NAME "fintek-cir"
#define FINTEK_DESCRIPTION "Fintek LPC SuperIO Consumer IR Transceiver"
#define VENDOR_ID_FINTEK 0x1934
/* debugging module parameter */
static int debug;
#define fit_pr(level, text, ...) \
printk(level KBUILD_MODNAME ": " text, ## __VA_ARGS__)
#define fit_dbg(text, ...) \
if (debug) \
printk(KERN_DEBUG \
KBUILD_MODNAME ": " text "\n" , ## __VA_ARGS__)
#define fit_dbg_verbose(text, ...) \
if (debug > 1) \
printk(KERN_DEBUG \
KBUILD_MODNAME ": " text "\n" , ## __VA_ARGS__)
#define fit_dbg_wake(text, ...) \
if (debug > 2) \
printk(KERN_DEBUG \
KBUILD_MODNAME ": " text "\n" , ## __VA_ARGS__)
#define TX_BUF_LEN 256
#define RX_BUF_LEN 32
struct fintek_dev {
struct pnp_dev *pdev;
struct rc_dev *rdev;
spinlock_t fintek_lock;
/* for rx */
u8 buf[RX_BUF_LEN];
unsigned int pkts;
struct {
spinlock_t lock;
u8 buf[TX_BUF_LEN];
unsigned int buf_count;
unsigned int cur_buf_num;
wait_queue_head_t queue;
} tx;
/* Config register index/data port pair */
u32 cr_ip;
u32 cr_dp;
/* hardware I/O settings */
unsigned long cir_addr;
int cir_irq;
int cir_port_len;
/* hardware id */
u8 chip_major;
u8 chip_minor;
u16 chip_vendor;
u8 logical_dev_cir;
/* hardware features */
bool hw_learning_capable;
bool hw_tx_capable;
/* rx settings */
bool learning_enabled;
bool carrier_detect_enabled;
enum {
CMD_HEADER = 0,
SUBCMD,
CMD_DATA,
PARSE_IRDATA,
} parser_state;
u8 cmd, rem;
/* carrier period = 1 / frequency */
u32 carrier;
};
/* buffer packet constants, largely identical to mceusb.c */
#define BUF_PULSE_BIT 0x80
#define BUF_LEN_MASK 0x1f
#define BUF_SAMPLE_MASK 0x7f
#define BUF_COMMAND_HEADER 0x9f
#define BUF_COMMAND_MASK 0xe0
#define BUF_COMMAND_NULL 0x00
#define BUF_HW_CMD_HEADER 0xff
#define BUF_CMD_G_REVISION 0x0b
#define BUF_CMD_S_CARRIER 0x06
#define BUF_CMD_S_TIMEOUT 0x0c
#define BUF_CMD_SIG_END 0x01
#define BUF_CMD_S_TXMASK 0x08
#define BUF_CMD_S_RXSENSOR 0x14
#define BUF_RSP_PULSE_COUNT 0x15
#define CIR_SAMPLE_PERIOD 50
/*
* Configuration Register:
* Index Port
* Data Port
*/
#define CR_INDEX_PORT 0x2e
#define CR_DATA_PORT 0x2f
/* Possible alternate values, depends on how the chip is wired */
#define CR_INDEX_PORT2 0x4e
#define CR_DATA_PORT2 0x4f
/*
* GCR_CONFIG_PORT_SEL bit 4 specifies which Index Port value is
* active. 1 = 0x4e, 0 = 0x2e
*/
#define PORT_SEL_PORT_4E_EN 0x10
/* Extended Function Mode enable/disable magic values */
#define CONFIG_REG_ENABLE 0x87
#define CONFIG_REG_DISABLE 0xaa
/* Chip IDs found in CR_CHIP_ID_{HI,LO} */
#define CHIP_ID_HIGH_F71809U 0x04
#define CHIP_ID_LOW_F71809U 0x08
/*
* Global control regs we need to care about:
* Global Control def.
* Register name addr val. */
#define GCR_SOFTWARE_RESET 0x02 /* 0x00 */
#define GCR_LOGICAL_DEV_NO 0x07 /* 0x00 */
#define GCR_CHIP_ID_HI 0x20 /* 0x04 */
#define GCR_CHIP_ID_LO 0x21 /* 0x08 */
#define GCR_VENDOR_ID_HI 0x23 /* 0x19 */
#define GCR_VENDOR_ID_LO 0x24 /* 0x34 */
#define GCR_CONFIG_PORT_SEL 0x25 /* 0x01 */
#define GCR_KBMOUSE_WAKEUP 0x27
#define LOGICAL_DEV_DISABLE 0x00
#define LOGICAL_DEV_ENABLE 0x01
/* Logical device number of the CIR function */
#define LOGICAL_DEV_CIR_REV1 0x05
#define LOGICAL_DEV_CIR_REV2 0x08
/* CIR Logical Device (LDN 0x08) config registers */
#define CIR_CR_COMMAND_INDEX 0x04
#define CIR_CR_IRCS 0x05 /* Before host writes command to IR, host
must set to 1. When host finshes write
command to IR, host must clear to 0. */
#define CIR_CR_COMMAND_DATA 0x06 /* Host read or write comand data */
#define CIR_CR_CLASS 0x07 /* 0xff = rx-only, 0x66 = rx + 2 tx,
0x33 = rx + 1 tx */
#define CIR_CR_DEV_EN 0x30 /* bit0 = 1 enables CIR */
#define CIR_CR_BASE_ADDR_HI 0x60 /* MSB of CIR IO base addr */
#define CIR_CR_BASE_ADDR_LO 0x61 /* LSB of CIR IO base addr */
#define CIR_CR_IRQ_SEL 0x70 /* bits3-0 store CIR IRQ */
#define CIR_CR_PSOUT_STATUS 0xf1
#define CIR_CR_WAKE_KEY3_ADDR 0xf8
#define CIR_CR_WAKE_KEY3_CODE 0xf9
#define CIR_CR_WAKE_KEY3_DC 0xfa
#define CIR_CR_WAKE_CONTROL 0xfb
#define CIR_CR_WAKE_KEY12_ADDR 0xfc
#define CIR_CR_WAKE_KEY4_ADDR 0xfd
#define CIR_CR_WAKE_KEY5_ADDR 0xfe
#define CLASS_RX_ONLY 0xff
#define CLASS_RX_2TX 0x66
#define CLASS_RX_1TX 0x33
/* CIR device registers */
#define CIR_STATUS 0x00
#define CIR_RX_DATA 0x01
#define CIR_TX_CONTROL 0x02
#define CIR_TX_DATA 0x03
#define CIR_CONTROL 0x04
/* Bits to enable CIR wake */
#define LOGICAL_DEV_ACPI 0x01
#define LDEV_ACPI_WAKE_EN_REG 0xe8
#define ACPI_WAKE_EN_CIR_BIT 0x04
#define LDEV_ACPI_PME_EN_REG 0xf0
#define LDEV_ACPI_PME_CLR_REG 0xf1
#define ACPI_PME_CIR_BIT 0x02
#define LDEV_ACPI_STATE_REG 0xf4
#define ACPI_STATE_CIR_BIT 0x20
/*
* CIR status register (0x00):
* 7 - CIR_IRQ_EN (1 = enable CIR IRQ, 0 = disable)
* 3 - TX_FINISH (1 when TX finished, write 1 to clear)
* 2 - TX_UNDERRUN (1 on TX underrun, write 1 to clear)
* 1 - RX_TIMEOUT (1 on RX timeout, write 1 to clear)
* 0 - RX_RECEIVE (1 on RX receive, write 1 to clear)
*/
#define CIR_STATUS_IRQ_EN 0x80
#define CIR_STATUS_TX_FINISH 0x08
#define CIR_STATUS_TX_UNDERRUN 0x04
#define CIR_STATUS_RX_TIMEOUT 0x02
#define CIR_STATUS_RX_RECEIVE 0x01
#define CIR_STATUS_IRQ_MASK 0x0f
/*
* CIR TX control register (0x02):
* 7 - TX_START (1 to indicate TX start, auto-cleared when done)
* 6 - TX_END (1 to indicate TX data written to TX fifo)
*/
#define CIR_TX_CONTROL_TX_START 0x80
#define CIR_TX_CONTROL_TX_END 0x40
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