1 /* 2 3 cx88-vp3054-i2c.c -- support for the secondary I2C bus of the 4 DNTV Live! DVB-T Pro (VP-3054), wired as: 5 GPIO[0] -> SCL, GPIO[1] -> SDA 6 7 (c) 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au> 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 2 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 23 */ 24 25 #include <linux/module.h> 26 #include <linux/slab.h> 27 #include <linux/init.h> 28 29 #include <asm/io.h> 30 31 #include "cx88.h" 32 #include "cx88-vp3054-i2c.h" 33 34 MODULE_DESCRIPTION("driver for cx2388x VP3054 design"); 35 MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>"); 36 MODULE_LICENSE("GPL"); 37 38 /* ----------------------------------------------------------------------- */ 39 40 static void vp3054_bit_setscl(void *data, int state) 41 { 42 struct cx8802_dev *dev = data; 43 struct cx88_core *core = dev->core; 44 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; 45 46 if (state) { 47 vp3054_i2c->state |= 0x0001; /* SCL high */ 48 vp3054_i2c->state &= ~0x0100; /* external pullup */ 49 } else { 50 vp3054_i2c->state &= ~0x0001; /* SCL low */ 51 vp3054_i2c->state |= 0x0100; /* drive pin */ 52 } 53 cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state); 54 cx_read(MO_GP0_IO); 55 } 56 57 static void vp3054_bit_setsda(void *data, int state) 58 { 59 struct cx8802_dev *dev = data; 60 struct cx88_core *core = dev->core; 61 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; 62 63 if (state) { 64 vp3054_i2c->state |= 0x0002; /* SDA high */ 65 vp3054_i2c->state &= ~0x0200; /* tristate pin */ 66 } else { 67 vp3054_i2c->state &= ~0x0002; /* SDA low */ 68 vp3054_i2c->state |= 0x0200; /* drive pin */ 69 } 70 cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state); 71 cx_read(MO_GP0_IO); 72 } 73 74 static int vp3054_bit_getscl(void *data) 75 { 76 struct cx8802_dev *dev = data; 77 struct cx88_core *core = dev->core; 78 u32 state; 79 80 state = cx_read(MO_GP0_IO); 81 return (state & 0x01) ? 1 : 0; 82 } 83 84 static int vp3054_bit_getsda(void *data) 85 { 86 struct cx8802_dev *dev = data; 87 struct cx88_core *core = dev->core; 88 u32 state; 89 90 state = cx_read(MO_GP0_IO); 91 return (state & 0x02) ? 1 : 0; 92 } 93 94 /* ----------------------------------------------------------------------- */ 95 96 static const struct i2c_algo_bit_data vp3054_i2c_algo_template = { 97 .setsda = vp3054_bit_setsda, 98 .setscl = vp3054_bit_setscl, 99 .getsda = vp3054_bit_getsda, 100 .getscl = vp3054_bit_getscl, 101 .udelay = 16, 102 .timeout = 200, 103 }; 104 105 /* ----------------------------------------------------------------------- */ 106 107 int vp3054_i2c_probe(struct cx8802_dev *dev) 108 { 109 struct cx88_core *core = dev->core; 110 struct vp3054_i2c_state *vp3054_i2c; 111 int rc; 112 113 if (core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO) 114 return 0; 115 116 vp3054_i2c = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL); 117 if (vp3054_i2c == NULL) 118 return -ENOMEM; 119 dev->vp3054 = vp3054_i2c; 120 121 vp3054_i2c->algo = vp3054_i2c_algo_template; 122 123 vp3054_i2c->adap.dev.parent = &dev->pci->dev; 124 strlcpy(vp3054_i2c->adap.name, core->name, 125 sizeof(vp3054_i2c->adap.name)); 126 vp3054_i2c->adap.owner = THIS_MODULE; 127 vp3054_i2c->algo.data = dev; 128 i2c_set_adapdata(&vp3054_i2c->adap, dev); 129 vp3054_i2c->adap.algo_data = &vp3054_i2c->algo; 130 131 vp3054_bit_setscl(dev,1); 132 vp3054_bit_setsda(dev,1); 133 134 rc = i2c_bit_add_bus(&vp3054_i2c->adap); 135 if (0 != rc) { 136 printk("%s: vp3054_i2c register FAILED\n", core->name); 137 138 kfree(dev->vp3054); 139 dev->vp3054 = NULL; 140 } 141 142 return rc; 143 } 144 145 void vp3054_i2c_remove(struct cx8802_dev *dev) 146 { 147 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; 148 149 if (vp3054_i2c == NULL || 150 dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO) 151 return; 152 153 i2c_del_adapter(&vp3054_i2c->adap); 154 kfree(vp3054_i2c); 155 } 156 157 EXPORT_SYMBOL(vp3054_i2c_probe); 158 EXPORT_SYMBOL(vp3054_i2c_remove); 159