drivers/media/video/cx18/cx18-gpio.c

   1 /*
   2  *  cx18 gpio functions
   3  *
   4  *  Derived from ivtv-gpio.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   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  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21  *  02111-1307  USA
  22  */
  23
  24 #include "cx18-driver.h"
  25 #include "cx18-cards.h"
  26 #include "cx18-gpio.h"
  27 #include "tuner-xc2028.h"
  28
  29 /********************* GPIO stuffs *********************/
  30
  31 /* GPIO registers */
  32 #define CX18_REG_GPIO_IN     0xc72010
  33 #define CX18_REG_GPIO_OUT1   0xc78100
  34 #define CX18_REG_GPIO_DIR1   0xc78108
  35 #define CX18_REG_GPIO_OUT2   0xc78104
  36 #define CX18_REG_GPIO_DIR2   0xc7810c
  37
  38 /*
  39  * HVR-1600 GPIO pins, courtesy of Hauppauge:
  40  *
  41  * gpio0: zilog ir process reset pin
  42  * gpio1: zilog programming pin (you should never use this)
  43  * gpio12: cx24227 reset pin
  44  * gpio13: cs5345 reset pin
  45 */
  46
  47 static void gpio_write(struct cx18 *cx)
  48 {
  49         u32 dir = cx->gpio_dir;
  50         u32 val = cx->gpio_val;
  51
  52         write_reg((dir & 0xffff) << 16, CX18_REG_GPIO_DIR1);
  53         write_reg(((dir & 0xffff) << 16) | (val & 0xffff),
  54                         CX18_REG_GPIO_OUT1);
  55         write_reg(dir & 0xffff0000, CX18_REG_GPIO_DIR2);
  56         write_reg_sync((dir & 0xffff0000) | ((val & 0xffff0000) >> 16),
  57                         CX18_REG_GPIO_OUT2);
  58 }
  59
  60 void cx18_reset_i2c_slaves_gpio(struct cx18 *cx)
  61 {
  62         const struct cx18_gpio_i2c_slave_reset *p;
  63
  64         p = &cx->card->gpio_i2c_slave_reset;
  65
  66         if ((p->active_lo_mask | p->active_hi_mask) == 0)
  67                 return;
  68
  69         /* Assuming that the masks are a subset of the bits in gpio_dir */
  70
  71         /* Assert */
  72         mutex_lock(&cx->gpio_lock);
  73         cx->gpio_val =
  74                 (cx->gpio_val | p->active_hi_mask) & ~(p->active_lo_mask);
  75         gpio_write(cx);
  76         schedule_timeout_uninterruptible(msecs_to_jiffies(p->msecs_asserted));
  77
  78         /* Deassert */
  79         cx->gpio_val =
  80                 (cx->gpio_val | p->active_lo_mask) & ~(p->active_hi_mask);
  81         gpio_write(cx);
  82         schedule_timeout_uninterruptible(msecs_to_jiffies(p->msecs_recovery));
  83         mutex_unlock(&cx->gpio_lock);
  84 }
  85
  86 void cx18_gpio_init(struct cx18 *cx)
  87 {
  88         mutex_lock(&cx->gpio_lock);
  89         cx->gpio_dir = cx->card->gpio_init.direction;
  90         cx->gpio_val = cx->card->gpio_init.initial_value;
  91
  92         if (cx->card->tuners[0].tuner == TUNER_XC2028) {
  93                 cx->gpio_dir |= 1 << cx->card->xceive_pin;
  94                 cx->gpio_val |= 1 << cx->card->xceive_pin;
  95         }
  96
  97         if (cx->gpio_dir == 0) {
  98                 mutex_unlock(&cx->gpio_lock);
  99                 return;
 100         }
 101
 102         CX18_DEBUG_INFO("GPIO initial dir: %08x/%08x out: %08x/%08x\n",
 103                    read_reg(CX18_REG_GPIO_DIR1), read_reg(CX18_REG_GPIO_DIR2),
 104                    read_reg(CX18_REG_GPIO_OUT1), read_reg(CX18_REG_GPIO_OUT2));
 105
 106         gpio_write(cx);
 107         mutex_unlock(&cx->gpio_lock);
 108 }
 109
 110 /* Xceive tuner reset function */
 111 int cx18_reset_tuner_gpio(void *dev, int cmd, int value)
 112 {
 113         struct i2c_algo_bit_data *algo = dev;
 114         struct cx18_i2c_algo_callback_data *cb_data = algo->data;
 115         struct cx18 *cx = cb_data->cx;
 116
 117         if (cmd != XC2028_TUNER_RESET)
 118                 return 0;
 119         CX18_DEBUG_INFO("Resetting tuner\n");
 120
 121         mutex_lock(&cx->gpio_lock);
 122         cx->gpio_val &= ~(1 << cx->card->xceive_pin);
 123         gpio_write(cx);
 124         mutex_unlock(&cx->gpio_lock);
 125         schedule_timeout_interruptible(msecs_to_jiffies(1));
 126
 127         mutex_lock(&cx->gpio_lock);
 128         cx->gpio_val |= 1 << cx->card->xceive_pin;
 129         gpio_write(cx);
 130         mutex_unlock(&cx->gpio_lock);
 131         schedule_timeout_interruptible(msecs_to_jiffies(1));
 132         return 0;
 133 }
 134
 135 int cx18_gpio(struct cx18 *cx, unsigned int command, void *arg)
 136 {
 137         struct v4l2_routing *route = arg;
 138         u32 mask, data;
 139
 140         switch (command) {
 141         case VIDIOC_INT_S_AUDIO_ROUTING:
 142                 if (route->input > 2)
 143                         return -EINVAL;
 144                 mask = cx->card->gpio_audio_input.mask;
 145                 switch (route->input) {
 146                 case 0:
 147                         data = cx->card->gpio_audio_input.tuner;
 148                         break;
 149                 case 1:
 150                         data = cx->card->gpio_audio_input.linein;
 151                         break;
 152                 case 2:
 153                 default:
 154                         data = cx->card->gpio_audio_input.radio;
 155                         break;
 156                 }
 157                 break;
 158
 159         default:
 160                 return -EINVAL;
 161         }
 162         if (mask) {
 163                 mutex_lock(&cx->gpio_lock);
 164                 cx->gpio_val = (cx->gpio_val & ~mask) | (data & mask);
 165                 gpio_write(cx);
 166                 mutex_unlock(&cx->gpio_lock);
 167         }
 168         return 0;
 169 }