drivers/media/video/cx88/cx88-vp3054-i2c.c

   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/moduleparam.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
  35 MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
  36 MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
  37 MODULE_LICENSE("GPL");
  38
  39 /* ----------------------------------------------------------------------- */
  40
  41 static void vp3054_bit_setscl(void *data, int state)
  42 {
  43         struct cx8802_dev *dev = data;
  44         struct cx88_core *core = dev->core;
  45         struct vp3054_i2c_state *vp3054_i2c = dev->card_priv;
  46
  47         if (state) {
  48                 vp3054_i2c->state |=  0x0001;   /* SCL high */
  49                 vp3054_i2c->state &= ~0x0100;   /* external pullup */
  50         } else {
  51                 vp3054_i2c->state &= ~0x0001;   /* SCL low */
  52                 vp3054_i2c->state |=  0x0100;   /* drive pin */
  53         }
  54         cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state);
  55         cx_read(MO_GP0_IO);
  56 }
  57
  58 static void vp3054_bit_setsda(void *data, int state)
  59 {
  60         struct cx8802_dev *dev = data;
  61         struct cx88_core *core = dev->core;
  62         struct vp3054_i2c_state *vp3054_i2c = dev->card_priv;
  63
  64         if (state) {
  65                 vp3054_i2c->state |=  0x0002;   /* SDA high */
  66                 vp3054_i2c->state &= ~0x0200;   /* tristate pin */
  67         } else {
  68                 vp3054_i2c->state &= ~0x0002;   /* SDA low */
  69                 vp3054_i2c->state |=  0x0200;   /* drive pin */
  70         }
  71         cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state);
  72         cx_read(MO_GP0_IO);
  73 }
  74
  75 static int vp3054_bit_getscl(void *data)
  76 {
  77         struct cx8802_dev *dev = data;
  78         struct cx88_core *core = dev->core;
  79         u32 state;
  80
  81         state = cx_read(MO_GP0_IO);
  82         return (state & 0x01) ? 1 : 0;
  83 }
  84
  85 static int vp3054_bit_getsda(void *data)
  86 {
  87         struct cx8802_dev *dev = data;
  88         struct cx88_core *core = dev->core;
  89         u32 state;
  90
  91         state = cx_read(MO_GP0_IO);
  92         return (state & 0x02) ? 1 : 0;
  93 }
  94
  95 /* ----------------------------------------------------------------------- */
  96
  97 static struct i2c_algo_bit_data vp3054_i2c_algo_template = {
  98         .setsda  = vp3054_bit_setsda,
  99         .setscl  = vp3054_bit_setscl,
 100         .getsda  = vp3054_bit_getsda,
 101         .getscl  = vp3054_bit_getscl,
 102         .udelay  = 16,
 103         .timeout = 200,
 104 };
 105
 106 /* ----------------------------------------------------------------------- */
 107
 108 static struct i2c_adapter vp3054_i2c_adap_template = {
 109         .name              = "cx2388x",
 110         .owner             = THIS_MODULE,
 111         .id                = I2C_HW_B_CX2388x,
 112 };
 113
 114 static struct i2c_client vp3054_i2c_client_template = {
 115         .name   = "VP-3054",
 116 };
 117
 118 int vp3054_i2c_probe(struct cx8802_dev *dev)
 119 {
 120         struct cx88_core *core = dev->core;
 121         struct vp3054_i2c_state *vp3054_i2c;
 122         int rc;
 123
 124         if (core->board != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
 125                 return 0;
 126
 127         dev->card_priv = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL);
 128         if (dev->card_priv == NULL)
 129                 return -ENOMEM;
 130         vp3054_i2c = dev->card_priv;
 131
 132         memcpy(&vp3054_i2c->adap, &vp3054_i2c_adap_template,
 133                sizeof(vp3054_i2c->adap));
 134         memcpy(&vp3054_i2c->algo, &vp3054_i2c_algo_template,
 135                sizeof(vp3054_i2c->algo));
 136         memcpy(&vp3054_i2c->client, &vp3054_i2c_client_template,
 137                sizeof(vp3054_i2c->client));
 138
 139         vp3054_i2c->adap.class |= I2C_CLASS_TV_DIGITAL;
 140
 141         vp3054_i2c->adap.dev.parent = &dev->pci->dev;
 142         strlcpy(vp3054_i2c->adap.name, core->name,
 143                 sizeof(vp3054_i2c->adap.name));
 144         vp3054_i2c->algo.data = dev;
 145         i2c_set_adapdata(&vp3054_i2c->adap, dev);
 146         vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
 147         vp3054_i2c->client.adapter = &vp3054_i2c->adap;
 148
 149         vp3054_bit_setscl(dev,1);
 150         vp3054_bit_setsda(dev,1);
 151
 152         rc = i2c_bit_add_bus(&vp3054_i2c->adap);
 153         if (0 != rc) {
 154                 printk("%s: vp3054_i2c register FAILED\n", core->name);
 155
 156                 kfree(dev->card_priv);
 157                 dev->card_priv = NULL;
 158         }
 159
 160         return rc;
 161 }
 162
 163 void vp3054_i2c_remove(struct cx8802_dev *dev)
 164 {
 165         struct vp3054_i2c_state *vp3054_i2c = dev->card_priv;
 166
 167         if (vp3054_i2c == NULL ||
 168             dev->core->board != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
 169                 return;
 170
 171         i2c_bit_del_bus(&vp3054_i2c->adap);
 172         kfree(vp3054_i2c);
 173 }
 174
 175 EXPORT_SYMBOL(vp3054_i2c_probe);
 176 EXPORT_SYMBOL(vp3054_i2c_remove);