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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 420 | giacomo | 1 | /* ------------------------------------------------------------------------- */ |
| 2 | /* i2c-philips-par.c i2c-hw access for philips style parallel port adapters */ |
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| 3 | /* ------------------------------------------------------------------------- */ |
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| 4 | /* Copyright (C) 1995-2000 Simon G. Vogl |
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| 5 | |||
| 6 | This program is free software; you can redistribute it and/or modify |
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| 7 | it under the terms of the GNU General Public License as published by |
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| 8 | the Free Software Foundation; either version 2 of the License, or |
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| 9 | (at your option) any later version. |
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| 10 | |||
| 11 | This program is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | GNU General Public License for more details. |
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| 15 | |||
| 16 | You should have received a copy of the GNU General Public License |
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| 17 | along with this program; if not, write to the Free Software |
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| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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| 19 | /* ------------------------------------------------------------------------- */ |
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| 20 | |||
| 21 | /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even |
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| 22 | Frodo Looijaard <frodol@dds.nl> */ |
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| 23 | |||
| 24 | /* $Id: i2c-philips-par.c,v 1.1 2004-01-28 15:12:06 giacomo Exp $ */ |
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| 25 | |||
| 26 | #include <linux/kernel.h> |
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| 27 | #include <linux/module.h> |
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| 28 | #include <linux/init.h> |
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| 29 | #include <linux/parport.h> |
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| 30 | #include <linux/i2c.h> |
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| 31 | #include <linux/i2c-algo-bit.h> |
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| 32 | |||
| 33 | static int type; |
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| 34 | |||
| 35 | struct i2c_par |
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| 36 | { |
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| 37 | struct pardevice *pdev; |
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| 38 | struct i2c_adapter adapter; |
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| 39 | struct i2c_algo_bit_data bit_lp_data; |
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| 40 | struct i2c_par *next; |
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| 41 | }; |
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| 42 | |||
| 43 | static struct i2c_par *adapter_list; |
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| 44 | |||
| 45 | |||
| 46 | /* ----- printer port defines ------------------------------------------*/ |
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| 47 | /* Pin Port Inverted name */ |
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| 48 | #define I2C_ON 0x20 /* 12 status N paper */ |
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| 49 | /* ... only for phil. not used */ |
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| 50 | #define I2C_SDA 0x80 /* 9 data N data7 */ |
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| 51 | #define I2C_SCL 0x08 /* 17 ctrl N dsel */ |
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| 52 | |||
| 53 | #define I2C_SDAIN 0x80 /* 11 stat Y busy */ |
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| 54 | #define I2C_SCLIN 0x08 /* 15 stat Y enable */ |
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| 55 | |||
| 56 | #define I2C_DMASK 0x7f |
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| 57 | #define I2C_CMASK 0xf7 |
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| 58 | |||
| 59 | /* ----- local functions ---------------------------------------------- */ |
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| 60 | |||
| 61 | static void bit_lp_setscl(void *data, int state) |
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| 62 | { |
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| 63 | /*be cautious about state of the control register - |
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| 64 | touch only the one bit needed*/ |
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| 65 | if (state) { |
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| 66 | parport_write_control((struct parport *) data, |
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| 67 | parport_read_control((struct parport *) data)|I2C_SCL); |
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| 68 | } else { |
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| 69 | parport_write_control((struct parport *) data, |
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| 70 | parport_read_control((struct parport *) data)&I2C_CMASK); |
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| 71 | } |
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| 72 | } |
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| 73 | |||
| 74 | static void bit_lp_setsda(void *data, int state) |
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| 75 | { |
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| 76 | if (state) { |
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| 77 | parport_write_data((struct parport *) data, I2C_DMASK); |
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| 78 | } else { |
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| 79 | parport_write_data((struct parport *) data, I2C_SDA); |
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| 80 | } |
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| 81 | } |
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| 82 | |||
| 83 | static int bit_lp_getscl(void *data) |
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| 84 | { |
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| 85 | return parport_read_status((struct parport *) data) & I2C_SCLIN; |
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| 86 | } |
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| 87 | |||
| 88 | static int bit_lp_getsda(void *data) |
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| 89 | { |
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| 90 | return parport_read_status((struct parport *) data) & I2C_SDAIN; |
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| 91 | } |
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| 92 | |||
| 93 | static void bit_lp_setscl2(void *data, int state) |
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| 94 | { |
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| 95 | if (state) { |
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| 96 | parport_write_data((struct parport *) data, |
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| 97 | parport_read_data((struct parport *) data)|0x1); |
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| 98 | } else { |
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| 99 | parport_write_data((struct parport *) data, |
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| 100 | parport_read_data((struct parport *) data)&0xfe); |
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| 101 | } |
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| 102 | } |
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| 103 | |||
| 104 | static void bit_lp_setsda2(void *data, int state) |
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| 105 | { |
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| 106 | if (state) { |
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| 107 | parport_write_data((struct parport *) data, |
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| 108 | parport_read_data((struct parport *) data)|0x2); |
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| 109 | } else { |
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| 110 | parport_write_data((struct parport *) data, |
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| 111 | parport_read_data((struct parport *) data)&0xfd); |
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| 112 | } |
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| 113 | } |
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| 114 | |||
| 115 | static int bit_lp_getsda2(void *data) |
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| 116 | { |
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| 117 | return (parport_read_status((struct parport *) data) & |
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| 118 | PARPORT_STATUS_BUSY) ? 0 : 1; |
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| 119 | } |
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| 120 | |||
| 121 | /* ------------------------------------------------------------------------ |
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| 122 | * Encapsulate the above functions in the correct operations structure. |
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| 123 | * This is only done when more than one hardware adapter is supported. |
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| 124 | */ |
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| 125 | |||
| 126 | static struct i2c_algo_bit_data bit_lp_data = { |
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| 127 | .setsda = bit_lp_setsda, |
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| 128 | .setscl = bit_lp_setscl, |
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| 129 | .getsda = bit_lp_getsda, |
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| 130 | .getscl = bit_lp_getscl, |
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| 131 | .udelay = 80, |
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| 132 | .mdelay = 80, |
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| 133 | .timeout = HZ |
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| 134 | }; |
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| 135 | |||
| 136 | static struct i2c_algo_bit_data bit_lp_data2 = { |
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| 137 | .setsda = bit_lp_setsda2, |
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| 138 | .setscl = bit_lp_setscl2, |
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| 139 | .getsda = bit_lp_getsda2, |
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| 140 | .udelay = 80, |
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| 141 | .mdelay = 80, |
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| 142 | .timeout = HZ |
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| 143 | }; |
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| 144 | |||
| 145 | static struct i2c_adapter bit_lp_ops = { |
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| 146 | .owner = THIS_MODULE, |
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| 147 | .id = I2C_HW_B_LP, |
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| 148 | .name = "Philips Parallel port adapter", |
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| 149 | }; |
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| 150 | |||
| 151 | static void i2c_parport_attach (struct parport *port) |
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| 152 | { |
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| 153 | struct i2c_par *adapter = kmalloc(sizeof(struct i2c_par), |
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| 154 | GFP_KERNEL); |
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| 155 | if (!adapter) { |
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| 156 | printk(KERN_ERR "i2c-philips-par: Unable to malloc.\n"); |
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| 157 | return; |
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| 158 | } |
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| 159 | memset (adapter, 0x00, sizeof(struct i2c_par)); |
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| 160 | |||
| 161 | /* printk(KERN_DEBUG "i2c-philips-par.o: attaching to %s\n", port->name); */ |
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| 162 | |||
| 163 | adapter->pdev = parport_register_device(port, "i2c-philips-par", |
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| 164 | NULL, NULL, NULL, |
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| 165 | PARPORT_FLAG_EXCL, |
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| 166 | NULL); |
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| 167 | if (!adapter->pdev) { |
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| 168 | printk(KERN_ERR "i2c-philips-par: Unable to register with parport.\n"); |
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| 169 | kfree(adapter); |
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| 170 | return; |
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| 171 | } |
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| 172 | |||
| 173 | adapter->adapter = bit_lp_ops; |
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| 174 | adapter->adapter.algo_data = &adapter->bit_lp_data; |
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| 175 | adapter->bit_lp_data = type ? bit_lp_data2 : bit_lp_data; |
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| 176 | adapter->bit_lp_data.data = port; |
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| 177 | |||
| 178 | if (parport_claim_or_block(adapter->pdev) < 0 ) { |
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| 179 | printk(KERN_ERR "i2c-philips-par: Could not claim parallel port.\n"); |
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| 180 | kfree(adapter); |
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| 181 | return; |
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| 182 | } |
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| 183 | /* reset hardware to sane state */ |
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| 184 | bit_lp_setsda(port, 1); |
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| 185 | bit_lp_setscl(port, 1); |
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| 186 | parport_release(adapter->pdev); |
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| 187 | |||
| 188 | if (i2c_bit_add_bus(&adapter->adapter) < 0) { |
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| 189 | printk(KERN_ERR "i2c-philips-par: Unable to register with I2C.\n"); |
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| 190 | parport_unregister_device(adapter->pdev); |
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| 191 | kfree(adapter); |
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| 192 | return; /* No good */ |
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| 193 | } |
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| 194 | |||
| 195 | adapter->next = adapter_list; |
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| 196 | adapter_list = adapter; |
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| 197 | } |
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| 198 | |||
| 199 | static void i2c_parport_detach (struct parport *port) |
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| 200 | { |
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| 201 | struct i2c_par *adapter, *prev = NULL; |
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| 202 | |||
| 203 | for (adapter = adapter_list; adapter; adapter = adapter->next) { |
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| 204 | if (adapter->pdev->port == port) { |
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| 205 | parport_unregister_device(adapter->pdev); |
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| 206 | i2c_bit_del_bus(&adapter->adapter); |
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| 207 | if (prev) |
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| 208 | prev->next = adapter->next; |
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| 209 | else |
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| 210 | adapter_list = adapter->next; |
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| 211 | kfree(adapter); |
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| 212 | return; |
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| 213 | } |
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| 214 | prev = adapter; |
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| 215 | } |
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| 216 | } |
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| 217 | |||
| 218 | static struct parport_driver i2c_driver = { |
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| 219 | .name = "i2c-philips-par", |
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| 220 | .attach = i2c_parport_attach, |
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| 221 | .detach = i2c_parport_detach, |
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| 222 | }; |
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| 223 | |||
| 224 | int __init i2c_bitlp_init(void) |
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| 225 | { |
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| 226 | printk(KERN_INFO "i2c Philips parallel port adapter driver\n"); |
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| 227 | |||
| 228 | return parport_register_driver(&i2c_driver); |
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| 229 | } |
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| 230 | |||
| 231 | void __exit i2c_bitlp_exit(void) |
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| 232 | { |
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| 233 | parport_unregister_driver(&i2c_driver); |
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| 234 | } |
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| 235 | |||
| 236 | MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>"); |
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| 237 | MODULE_DESCRIPTION("I2C-Bus adapter routines for Philips parallel port adapter"); |
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| 238 | MODULE_LICENSE("GPL"); |
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| 239 | |||
| 240 | MODULE_PARM(type, "i"); |
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| 241 | |||
| 242 | module_init(i2c_bitlp_init); |
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| 243 | module_exit(i2c_bitlp_exit); |