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/ucb1400.h>
  25
  26 unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
  27                 int adcsync)
  28 {
  29         unsigned int val;
  30
  31         if (adcsync)
  32                 adc_channel |= UCB_ADC_SYNC_ENA;
  33
  34         ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
  35         ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel |
  36                         UCB_ADC_START);
  37
  38         while (!((val = ucb1400_reg_read(ac97, UCB_ADC_DATA))
  39                                 & UCB_ADC_DAT_VALID))
  40                 schedule_timeout_uninterruptible(1);
  41
  42         return val & UCB_ADC_DAT_MASK;
  43 }
  44 EXPORT_SYMBOL_GPL(ucb1400_adc_read);
  45
  46 static int ucb1400_core_probe(struct device *dev)
  47 {
  48         int err;
  49         struct ucb1400 *ucb;
  50         struct ucb1400_ts ucb_ts;
  51         struct ucb1400_gpio ucb_gpio;
  52         struct snd_ac97 *ac97;
  53
  54         memset(&ucb_ts, 0, sizeof(ucb_ts));
  55         memset(&ucb_gpio, 0, sizeof(ucb_gpio));
  56
  57         ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
  58         if (!ucb) {
  59                 err = -ENOMEM;
  60                 goto err;
  61         }
  62
  63         dev_set_drvdata(dev, ucb);
  64
  65         ac97 = to_ac97_t(dev);
  66
  67         ucb_ts.id = ucb1400_reg_read(ac97, UCB_ID);
  68         if (ucb_ts.id != UCB_ID_1400) {
  69                 err = -ENODEV;
  70                 goto err0;
  71         }
  72
  73         /* GPIO */
  74         ucb_gpio.ac97 = ac97;
  75         ucb->ucb1400_gpio = platform_device_alloc("ucb1400_gpio", -1);
  76         if (!ucb->ucb1400_gpio) {
  77                 err = -ENOMEM;
  78                 goto err0;
  79         }
  80         err = platform_device_add_data(ucb->ucb1400_gpio, &ucb_gpio,
  81                                         sizeof(ucb_gpio));
  82         if (err)
  83                 goto err1;
  84         err = platform_device_add(ucb->ucb1400_gpio);
  85         if (err)
  86                 goto err1;
  87
  88         /* TOUCHSCREEN */
  89         ucb_ts.ac97 = ac97;
  90         ucb->ucb1400_ts = platform_device_alloc("ucb1400_ts", -1);
  91         if (!ucb->ucb1400_ts) {
  92                 err = -ENOMEM;
  93                 goto err2;
  94         }
  95         err = platform_device_add_data(ucb->ucb1400_ts, &ucb_ts,
  96                                         sizeof(ucb_ts));
  97         if (err)
  98                 goto err3;
  99         err = platform_device_add(ucb->ucb1400_ts);
 100         if (err)
 101                 goto err3;
 102
 103         return 0;
 104
 105 err3:
 106         platform_device_put(ucb->ucb1400_ts);
 107 err2:
 108         platform_device_unregister(ucb->ucb1400_gpio);
 109 err1:
 110         platform_device_put(ucb->ucb1400_gpio);
 111 err0:
 112         kfree(ucb);
 113 err:
 114         return err;
 115 }
 116
 117 static int ucb1400_core_remove(struct device *dev)
 118 {
 119         struct ucb1400 *ucb = dev_get_drvdata(dev);
 120
 121         platform_device_unregister(ucb->ucb1400_ts);
 122         platform_device_unregister(ucb->ucb1400_gpio);
 123
 124         kfree(ucb);
 125         return 0;
 126 }
 127
 128 static struct device_driver ucb1400_core_driver = {
 129         .name   = "ucb1400_core",
 130         .bus    = &ac97_bus_type,
 131         .probe  = ucb1400_core_probe,
 132         .remove = ucb1400_core_remove,
 133 };
 134
 135 static int __init ucb1400_core_init(void)
 136 {
 137         return driver_register(&ucb1400_core_driver);
 138 }
 139
 140 static void __exit ucb1400_core_exit(void)
 141 {
 142         driver_unregister(&ucb1400_core_driver);
 143 }
 144
 145 module_init(ucb1400_core_init);
 146 module_exit(ucb1400_core_exit);
 147
 148 MODULE_DESCRIPTION("Philips UCB1400 driver");
 149 MODULE_LICENSE("GPL");