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 doesn't 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/slab.h>
  26 #include <linux/ucb1400.h>
  27
  28 unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
  29                 int adcsync)
  30 {
  31         unsigned int val;
  32
  33         if (adcsync)
  34                 adc_channel |= UCB_ADC_SYNC_ENA;
  35
  36         ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
  37         ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel |
  38                         UCB_ADC_START);
  39
  40         while (!((val = ucb1400_reg_read(ac97, UCB_ADC_DATA))
  41                                 & UCB_ADC_DAT_VALID))
  42                 schedule_timeout_uninterruptible(1);
  43
  44         return val & UCB_ADC_DAT_MASK;
  45 }
  46 EXPORT_SYMBOL_GPL(ucb1400_adc_read);
  47
  48 static int ucb1400_core_probe(struct device *dev)
  49 {
  50         int err;
  51         struct ucb1400 *ucb;
  52         struct ucb1400_ts ucb_ts;
  53         struct ucb1400_gpio ucb_gpio;
  54         struct snd_ac97 *ac97;
  55         struct ucb1400_pdata *pdata = dev->platform_data;
  56
  57         memset(&ucb_ts, 0, sizeof(ucb_ts));
  58         memset(&ucb_gpio, 0, sizeof(ucb_gpio));
  59
  60         ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
  61         if (!ucb) {
  62                 err = -ENOMEM;
  63                 goto err;
  64         }
  65
  66         dev_set_drvdata(dev, ucb);
  67
  68         ac97 = to_ac97_t(dev);
  69
  70         ucb_ts.id = ucb1400_reg_read(ac97, UCB_ID);
  71         if (ucb_ts.id != UCB_ID_1400) {
  72                 err = -ENODEV;
  73                 goto err0;
  74         }
  75
  76         /* GPIO */
  77         ucb_gpio.ac97 = ac97;
  78         ucb->ucb1400_gpio = platform_device_alloc("ucb1400_gpio", -1);
  79         if (!ucb->ucb1400_gpio) {
  80                 err = -ENOMEM;
  81                 goto err0;
  82         }
  83         err = platform_device_add_data(ucb->ucb1400_gpio, &ucb_gpio,
  84                                         sizeof(ucb_gpio));
  85         if (err)
  86                 goto err1;
  87         err = platform_device_add(ucb->ucb1400_gpio);
  88         if (err)
  89                 goto err1;
  90
  91         /* TOUCHSCREEN */
  92         ucb_ts.ac97 = ac97;
  93
  94         if (pdata != NULL && pdata->irq >= 0)
  95                 ucb_ts.irq = pdata->irq;
  96         else
  97                 ucb_ts.irq = -1;
  98
  99         ucb->ucb1400_ts = platform_device_alloc("ucb1400_ts", -1);
 100         if (!ucb->ucb1400_ts) {
 101                 err = -ENOMEM;
 102                 goto err2;
 103         }
 104         err = platform_device_add_data(ucb->ucb1400_ts, &ucb_ts,
 105                                         sizeof(ucb_ts));
 106         if (err)
 107                 goto err3;
 108         err = platform_device_add(ucb->ucb1400_ts);
 109         if (err)
 110                 goto err3;
 111
 112         return 0;
 113
 114 err3:
 115         platform_device_put(ucb->ucb1400_ts);
 116 err2:
 117         platform_device_del(ucb->ucb1400_gpio);
 118 err1:
 119         platform_device_put(ucb->ucb1400_gpio);
 120 err0:
 121         kfree(ucb);
 122 err:
 123         return err;
 124 }
 125
 126 static int ucb1400_core_remove(struct device *dev)
 127 {
 128         struct ucb1400 *ucb = dev_get_drvdata(dev);
 129
 130         platform_device_unregister(ucb->ucb1400_ts);
 131         platform_device_unregister(ucb->ucb1400_gpio);
 132
 133         kfree(ucb);
 134         return 0;
 135 }
 136
 137 static struct device_driver ucb1400_core_driver = {
 138         .name   = "ucb1400_core",
 139         .bus    = &ac97_bus_type,
 140         .probe  = ucb1400_core_probe,
 141         .remove = ucb1400_core_remove,
 142 };
 143
 144 static int __init ucb1400_core_init(void)
 145 {
 146         return driver_register(&ucb1400_core_driver);
 147 }
 148
 149 static void __exit ucb1400_core_exit(void)
 150 {
 151         driver_unregister(&ucb1400_core_driver);
 152 }
 153
 154 module_init(ucb1400_core_init);
 155 module_exit(ucb1400_core_exit);
 156
 157 MODULE_DESCRIPTION("Philips UCB1400 driver");
 158 MODULE_LICENSE("GPL");