^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* ------------------------------------------------------------------------ *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * i2c-parport.c I2C bus over parallel port *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * ------------------------------------------------------------------------ *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) Copyright (C) 2003-2011 Jean Delvare <jdelvare@suse.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) Based on older i2c-philips-par.c driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) Copyright (C) 1995-2000 Simon G. Vogl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) With some changes from:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) Frodo Looijaard <frodol@dds.nl>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) Kyösti Mälkki <kmalkki@cc.hut.fi>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * ------------------------------------------------------------------------ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define pr_fmt(fmt) "i2c-parport: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/parport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/i2c-algo-bit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/i2c-smbus.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define PORT_DATA 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define PORT_STAT 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define PORT_CTRL 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct lineop {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) u8 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u8 port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) u8 inverted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct adapter_parm {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct lineop setsda;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct lineop setscl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct lineop getsda;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct lineop getscl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct lineop init;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) unsigned int smbus_alert:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static const struct adapter_parm adapter_parm[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* type 0: Philips adapter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .setsda = { 0x80, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) .setscl = { 0x08, PORT_CTRL, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) .getsda = { 0x80, PORT_STAT, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .getscl = { 0x08, PORT_STAT, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /* type 1: home brew teletext adapter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) .setsda = { 0x02, PORT_DATA, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) .setscl = { 0x01, PORT_DATA, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) .getsda = { 0x80, PORT_STAT, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* type 2: Velleman K8000 adapter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .setsda = { 0x02, PORT_CTRL, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) .setscl = { 0x08, PORT_CTRL, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) .getsda = { 0x10, PORT_STAT, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /* type 3: ELV adapter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) .setsda = { 0x02, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) .setscl = { 0x01, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .getsda = { 0x40, PORT_STAT, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) .getscl = { 0x08, PORT_STAT, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /* type 4: ADM1032 evaluation board */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .setsda = { 0x02, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) .setscl = { 0x01, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) .getsda = { 0x10, PORT_STAT, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .init = { 0xf0, PORT_DATA, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .smbus_alert = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /* type 5: ADM1025, ADM1030 and ADM1031 evaluation boards */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .setsda = { 0x02, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) .setscl = { 0x01, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) .getsda = { 0x10, PORT_STAT, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /* type 6: Barco LPT->DVI (K5800236) adapter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) .setsda = { 0x02, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) .setscl = { 0x01, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .getsda = { 0x20, PORT_STAT, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) .getscl = { 0x40, PORT_STAT, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) .init = { 0xfc, PORT_DATA, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* type 7: One For All JP1 parallel port adapter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) .setsda = { 0x01, PORT_DATA, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) .setscl = { 0x02, PORT_DATA, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) .getsda = { 0x80, PORT_STAT, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) .init = { 0x04, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* type 8: VCT-jig */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) .setsda = { 0x04, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) .setscl = { 0x01, PORT_DATA, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .getsda = { 0x40, PORT_STAT, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) .getscl = { 0x80, PORT_STAT, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* ----- Device list ------------------------------------------------------ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct i2c_par {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct pardevice *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct i2c_adapter adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct i2c_algo_bit_data algo_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) struct i2c_smbus_alert_setup alert_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct i2c_client *ara;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct list_head node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static LIST_HEAD(adapter_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static DEFINE_MUTEX(adapter_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) #define MAX_DEVICE 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int parport[MAX_DEVICE] = {0, -1, -1, -1};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) module_param_array(parport, int, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) MODULE_PARM_DESC(parport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) "List of parallel ports to bind to, by index.\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) " At most " __stringify(MAX_DEVICE) " devices are supported.\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) " Default is one device connected to parport0.\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static int type = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) module_param(type, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) MODULE_PARM_DESC(type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) "Type of adapter:\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) " 0 = Philips adapter\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) " 1 = home brew teletext adapter\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) " 2 = Velleman K8000 adapter\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) " 3 = ELV adapter\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) " 4 = ADM1032 evaluation board\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) " 5 = ADM1025, ADM1030 and ADM1031 evaluation boards\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) " 6 = Barco LPT->DVI (K5800236) adapter\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) " 7 = One For All JP1 parallel port adapter\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) " 8 = VCT-jig\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* ----- Low-level parallel port access ----------------------------------- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static void port_write_data(struct parport *p, unsigned char d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) parport_write_data(p, d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static void port_write_control(struct parport *p, unsigned char d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) parport_write_control(p, d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static unsigned char port_read_data(struct parport *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return parport_read_data(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static unsigned char port_read_status(struct parport *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return parport_read_status(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static unsigned char port_read_control(struct parport *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return parport_read_control(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static void (* const port_write[])(struct parport *, unsigned char) = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) port_write_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) port_write_control,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) static unsigned char (* const port_read[])(struct parport *) = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) port_read_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) port_read_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) port_read_control,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /* ----- Unified line operation functions --------------------------------- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static inline void line_set(struct parport *data, int state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) const struct lineop *op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) u8 oldval = port_read[op->port](data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /* Touch only the bit(s) needed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if ((op->inverted && !state) || (!op->inverted && state))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) port_write[op->port](data, oldval | op->val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) port_write[op->port](data, oldval & ~op->val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static inline int line_get(struct parport *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) const struct lineop *op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) u8 oldval = port_read[op->port](data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return ((op->inverted && (oldval & op->val) != op->val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) || (!op->inverted && (oldval & op->val) == op->val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) /* ----- I2C algorithm call-back functions and structures ----------------- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static void parport_setscl(void *data, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) line_set((struct parport *) data, state, &adapter_parm[type].setscl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static void parport_setsda(void *data, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) line_set((struct parport *) data, state, &adapter_parm[type].setsda);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static int parport_getscl(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) return line_get((struct parport *) data, &adapter_parm[type].getscl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static int parport_getsda(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return line_get((struct parport *) data, &adapter_parm[type].getsda);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /* Encapsulate the functions above in the correct structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) Note that this is only a template, from which the real structures are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) copied. The attaching code will set getscl to NULL for adapters that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) cannot read SCL back, and will also make the data field point to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) the parallel port structure. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static const struct i2c_algo_bit_data parport_algo_data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) .setsda = parport_setsda,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) .setscl = parport_setscl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) .getsda = parport_getsda,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) .getscl = parport_getscl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) .udelay = 10, /* ~50 kbps */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) .timeout = HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) /* ----- I2c and parallel port call-back functions and structures --------- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static void i2c_parport_irq(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct i2c_par *adapter = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct i2c_client *ara = adapter->ara;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (ara) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) dev_dbg(&ara->dev, "SMBus alert received\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) i2c_handle_smbus_alert(ara);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) dev_dbg(&adapter->adapter.dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) "SMBus alert received but no ARA client!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static void i2c_parport_attach(struct parport *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) struct i2c_par *adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct pardev_cb i2c_parport_cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) for (i = 0; i < MAX_DEVICE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (parport[i] == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (port->number == parport[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (i == MAX_DEVICE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) pr_debug("Not using parport%d.\n", port->number);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) adapter = kzalloc(sizeof(struct i2c_par), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (!adapter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) memset(&i2c_parport_cb, 0, sizeof(i2c_parport_cb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) i2c_parport_cb.flags = PARPORT_FLAG_EXCL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) i2c_parport_cb.irq_func = i2c_parport_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) i2c_parport_cb.private = adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) pr_debug("attaching to %s\n", port->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) parport_disable_irq(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) adapter->pdev = parport_register_dev_model(port, "i2c-parport",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) &i2c_parport_cb, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (!adapter->pdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) pr_err("Unable to register with parport\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) goto err_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) /* Fill the rest of the structure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) adapter->adapter.owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) adapter->adapter.class = I2C_CLASS_HWMON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) strlcpy(adapter->adapter.name, "Parallel port adapter",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) sizeof(adapter->adapter.name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) adapter->algo_data = parport_algo_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /* Slow down if we can't sense SCL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (!adapter_parm[type].getscl.val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) adapter->algo_data.getscl = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) adapter->algo_data.udelay = 50; /* ~10 kbps */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) adapter->algo_data.data = port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) adapter->adapter.algo_data = &adapter->algo_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) adapter->adapter.dev.parent = port->physport->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (parport_claim_or_block(adapter->pdev) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) dev_err(&adapter->pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) "Could not claim parallel port\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) goto err_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) /* Reset hardware to a sane state (SCL and SDA high) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) parport_setsda(port, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) parport_setscl(port, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /* Other init if needed (power on...) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) if (adapter_parm[type].init.val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) line_set(port, 1, &adapter_parm[type].init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /* Give powered devices some time to settle */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) msleep(100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (i2c_bit_add_bus(&adapter->adapter) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) dev_err(&adapter->pdev->dev, "Unable to register with I2C\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) goto err_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) /* Setup SMBus alert if supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (adapter_parm[type].smbus_alert) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct i2c_client *ara;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) ara = i2c_new_smbus_alert_device(&adapter->adapter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) &adapter->alert_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (!IS_ERR(ara)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) adapter->ara = ara;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) parport_enable_irq(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) dev_warn(&adapter->pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) "Failed to register ARA client\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) /* Add the new adapter to the list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) mutex_lock(&adapter_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) list_add_tail(&adapter->node, &adapter_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) mutex_unlock(&adapter_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) err_unregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) parport_release(adapter->pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) parport_unregister_device(adapter->pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) err_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) kfree(adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static void i2c_parport_detach(struct parport *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) struct i2c_par *adapter, *_n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) /* Walk the list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) mutex_lock(&adapter_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) list_for_each_entry_safe(adapter, _n, &adapter_list, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) if (adapter->pdev->port == port) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (adapter->ara) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) parport_disable_irq(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) i2c_unregister_device(adapter->ara);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) i2c_del_adapter(&adapter->adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) /* Un-init if needed (power off...) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (adapter_parm[type].init.val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) line_set(port, 0, &adapter_parm[type].init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) parport_release(adapter->pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) parport_unregister_device(adapter->pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) list_del(&adapter->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) kfree(adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) mutex_unlock(&adapter_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) static struct parport_driver i2c_parport_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) .name = "i2c-parport",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) .match_port = i2c_parport_attach,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) .detach = i2c_parport_detach,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) .devmodel = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) /* ----- Module loading, unloading and information ------------------------ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static int __init i2c_parport_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (type < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) pr_warn("adapter type unspecified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (type >= ARRAY_SIZE(adapter_parm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) pr_warn("invalid type (%d)\n", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return parport_register_driver(&i2c_parport_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) static void __exit i2c_parport_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) parport_unregister_driver(&i2c_parport_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) MODULE_DESCRIPTION("I2C bus over parallel port");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) module_init(i2c_parport_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) module_exit(i2c_parport_exit);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags