1 /* 2 * cx88-vp3054-i2c.c -- support for the secondary I2C bus of the 3 * DNTV Live! DVB-T Pro (VP-3054), wired as: 4 * GPIO[0] -> SCL, GPIO[1] -> SDA 5 * 6 * (c) 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include "cx88.h" 20 #include "cx88-vp3054-i2c.h" 21 22 #include <linux/module.h> 23 #include <linux/slab.h> 24 #include <linux/init.h> 25 #include <linux/io.h> 26 27 MODULE_DESCRIPTION("driver for cx2388x VP3054 design"); 28 MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>"); 29 MODULE_LICENSE("GPL"); 30 31 /* ----------------------------------------------------------------------- */ 32 33 static void vp3054_bit_setscl(void *data, int state) 34 { 35 struct cx8802_dev *dev = data; 36 struct cx88_core *core = dev->core; 37 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; 38 39 if (state) { 40 vp3054_i2c->state |= 0x0001; /* SCL high */ 41 vp3054_i2c->state &= ~0x0100; /* external pullup */ 42 } else { 43 vp3054_i2c->state &= ~0x0001; /* SCL low */ 44 vp3054_i2c->state |= 0x0100; /* drive pin */ 45 } 46 cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state); 47 cx_read(MO_GP0_IO); 48 } 49 50 static void vp3054_bit_setsda(void *data, int state) 51 { 52 struct cx8802_dev *dev = data; 53 struct cx88_core *core = dev->core; 54 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; 55 56 if (state) { 57 vp3054_i2c->state |= 0x0002; /* SDA high */ 58 vp3054_i2c->state &= ~0x0200; /* tristate pin */ 59 } else { 60 vp3054_i2c->state &= ~0x0002; /* SDA low */ 61 vp3054_i2c->state |= 0x0200; /* drive pin */ 62 } 63 cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state); 64 cx_read(MO_GP0_IO); 65 } 66 67 static int vp3054_bit_getscl(void *data) 68 { 69 struct cx8802_dev *dev = data; 70 struct cx88_core *core = dev->core; 71 u32 state; 72 73 state = cx_read(MO_GP0_IO); 74 return (state & 0x01) ? 1 : 0; 75 } 76 77 static int vp3054_bit_getsda(void *data) 78 { 79 struct cx8802_dev *dev = data; 80 struct cx88_core *core = dev->core; 81 u32 state; 82 83 state = cx_read(MO_GP0_IO); 84 return (state & 0x02) ? 1 : 0; 85 } 86 87 /* ----------------------------------------------------------------------- */ 88 89 static const struct i2c_algo_bit_data vp3054_i2c_algo_template = { 90 .setsda = vp3054_bit_setsda, 91 .setscl = vp3054_bit_setscl, 92 .getsda = vp3054_bit_getsda, 93 .getscl = vp3054_bit_getscl, 94 .udelay = 16, 95 .timeout = 200, 96 }; 97 98 /* ----------------------------------------------------------------------- */ 99 100 int vp3054_i2c_probe(struct cx8802_dev *dev) 101 { 102 struct cx88_core *core = dev->core; 103 struct vp3054_i2c_state *vp3054_i2c; 104 int rc; 105 106 if (core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO) 107 return 0; 108 109 vp3054_i2c = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL); 110 if (!vp3054_i2c) 111 return -ENOMEM; 112 dev->vp3054 = vp3054_i2c; 113 114 vp3054_i2c->algo = vp3054_i2c_algo_template; 115 116 vp3054_i2c->adap.dev.parent = &dev->pci->dev; 117 strscpy(vp3054_i2c->adap.name, core->name, 118 sizeof(vp3054_i2c->adap.name)); 119 vp3054_i2c->adap.owner = THIS_MODULE; 120 vp3054_i2c->algo.data = dev; 121 i2c_set_adapdata(&vp3054_i2c->adap, dev); 122 vp3054_i2c->adap.algo_data = &vp3054_i2c->algo; 123 124 vp3054_bit_setscl(dev, 1); 125 vp3054_bit_setsda(dev, 1); 126 127 rc = i2c_bit_add_bus(&vp3054_i2c->adap); 128 if (rc != 0) { 129 pr_err("vp3054_i2c register FAILED\n"); 130 131 kfree(dev->vp3054); 132 dev->vp3054 = NULL; 133 } 134 135 return rc; 136 } 137 EXPORT_SYMBOL(vp3054_i2c_probe); 138 139 void vp3054_i2c_remove(struct cx8802_dev *dev) 140 { 141 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; 142 143 if (!vp3054_i2c || 144 dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO) 145 return; 146 147 i2c_del_adapter(&vp3054_i2c->adap); 148 kfree(vp3054_i2c); 149 } 150 EXPORT_SYMBOL(vp3054_i2c_remove); 151