drivers/mfd/ucb1400_core.c

   1 /*
   2  * Core functions for:
   3  *  Philips UCB1400 multifunction chip
   4  *
   5  * Based on ucb1400_ts.c:
   6  *  Author:     Nicolas Pitre
   7  *  Created:    September 25, 2006
   8  *  Copyright:  MontaVista Software, Inc.
   9  *
  10  * Spliting done by: Marek Vasut <marek.vasut@gmail.com>
  11  * If something doesnt work and it worked before spliting, e-mail me,
  12  * dont bother Nicolas please ;-)
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  *
  18  * This code is heavily based on ucb1x00-*.c copyrighted by Russell King
  19  * covering the UCB1100, UCB1200 and UCB1300..  Support for the UCB1400 has
  20  * been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/sched.h>
  25 #include <linux/ucb1400.h>
  26
  27 unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
  28                 int adcsync)
  29 {
  30         unsigned int val;
  31
  32         if (adcsync)
  33                 adc_channel |= UCB_ADC_SYNC_ENA;
  34
  35         ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
  36         ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel |
  37                         UCB_ADC_START);
  38
  39         while (!((val = ucb1400_reg_read(ac97, UCB_ADC_DATA))
  40                                 & UCB_ADC_DAT_VALID))
  41                 schedule_timeout_uninterruptible(1);
  42
  43         return val & UCB_ADC_DAT_MASK;
  44 }
  45 EXPORT_SYMBOL_GPL(ucb1400_adc_read);
  46
  47 static int ucb1400_core_probe(struct device *dev)
  48 {
  49         int err;
  50         struct ucb1400 *ucb;
  51         struct ucb1400_ts ucb_ts;
  52         struct ucb1400_gpio ucb_gpio;
  53         struct snd_ac97 *ac97;
  54
  55         memset(&ucb_ts, 0, sizeof(ucb_ts));
  56         memset(&ucb_gpio, 0, sizeof(ucb_gpio));
  57
  58         ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
  59         if (!ucb) {
  60                 err = -ENOMEM;
  61                 goto err;
  62         }
  63
  64         dev_set_drvdata(dev, ucb);
  65
  66         ac97 = to_ac97_t(dev);
  67
  68         ucb_ts.id = ucb1400_reg_read(ac97, UCB_ID);
  69         if (ucb_ts.id != UCB_ID_1400) {
  70                 err = -ENODEV;
  71                 goto err0;
  72         }
  73
  74         /* GPIO */
  75         ucb_gpio.ac97 = ac97;
  76         ucb->ucb1400_gpio = platform_device_alloc("ucb1400_gpio", -1);
  77         if (!ucb->ucb1400_gpio) {
  78                 err = -ENOMEM;
  79                 goto err0;
  80         }
  81         err = platform_device_add_data(ucb->ucb1400_gpio, &ucb_gpio,
  82                                         sizeof(ucb_gpio));
  83         if (err)
  84                 goto err1;
  85         err = platform_device_add(ucb->ucb1400_gpio);
  86         if (err)
  87                 goto err1;
  88
  89         /* TOUCHSCREEN */
  90         ucb_ts.ac97 = ac97;
  91         ucb->ucb1400_ts = platform_device_alloc("ucb1400_ts", -1);
  92         if (!ucb->ucb1400_ts) {
  93                 err = -ENOMEM;
  94                 goto err2;
  95         }
  96         err = platform_device_add_data(ucb->ucb1400_ts, &ucb_ts,
  97                                         sizeof(ucb_ts));
  98         if (err)
  99                 goto err3;
 100         err = platform_device_add(ucb->ucb1400_ts);
 101         if (err)
 102                 goto err3;
 103
 104         return 0;
 105
 106 err3:
 107         platform_device_put(ucb->ucb1400_ts);
 108 err2:
 109         platform_device_unregister(ucb->ucb1400_gpio);
 110 err1:
 111         platform_device_put(ucb->ucb1400_gpio);
 112 err0:
 113         kfree(ucb);
 114 err:
 115         return err;
 116 }
 117
 118 static int ucb1400_core_remove(struct device *dev)
 119 {
 120         struct ucb1400 *ucb = dev_get_drvdata(dev);
 121
 122         platform_device_unregister(ucb->ucb1400_ts);
 123         platform_device_unregister(ucb->ucb1400_gpio);
 124
 125         kfree(ucb);
 126         return 0;
 127 }
 128
 129 static struct device_driver ucb1400_core_driver = {
 130         .name   = "ucb1400_core",
 131         .bus    = &ac97_bus_type,
 132         .probe  = ucb1400_core_probe,
 133         .remove = ucb1400_core_remove,
 134 };
 135
 136 static int __init ucb1400_core_init(void)
 137 {
 138         return driver_register(&ucb1400_core_driver);
 139 }
 140
 141 static void __exit ucb1400_core_exit(void)
 142 {
 143         driver_unregister(&ucb1400_core_driver);
 144 }
 145
 146 module_init(ucb1400_core_init);
 147 module_exit(ucb1400_core_exit);
 148
 149 MODULE_DESCRIPTION("Philips UCB1400 driver");
 150 MODULE_LICENSE("GPL");