drivers/input/misc/mc13783-pwrbutton.c

   1 /**
   2  * Copyright (C) 2011 Philippe Rétornaz
   3  *
   4  * Based on twl4030-pwrbutton driver by:
   5  *     Peter De Schrijver <peter.de-schrijver@nokia.com>
   6  *     Felipe Balbi <felipe.balbi@nokia.com>
   7  *
   8  * This file is subject to the terms and conditions of the GNU General
   9  * Public License. See the file "COPYING" in the main directory of this
  10  * archive for more details.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335  USA
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/errno.h>
  25 #include <linux/input.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/mfd/mc13783.h>
  29 #include <linux/sched.h>
  30 #include <linux/slab.h>
  31
  32 struct mc13783_pwrb {
  33         struct input_dev *pwr;
  34         struct mc13xxx *mc13783;
  35 #define MC13783_PWRB_B1_POL_INVERT      (1 << 0)
  36 #define MC13783_PWRB_B2_POL_INVERT      (1 << 1)
  37 #define MC13783_PWRB_B3_POL_INVERT      (1 << 2)
  38         int flags;
  39         unsigned short keymap[3];
  40 };
  41
  42 #define MC13783_REG_INTERRUPT_SENSE_1           5
  43 #define MC13783_IRQSENSE1_ONOFD1S               (1 << 3)
  44 #define MC13783_IRQSENSE1_ONOFD2S               (1 << 4)
  45 #define MC13783_IRQSENSE1_ONOFD3S               (1 << 5)
  46
  47 #define MC13783_REG_POWER_CONTROL_2             15
  48 #define MC13783_POWER_CONTROL_2_ON1BDBNC        4
  49 #define MC13783_POWER_CONTROL_2_ON2BDBNC        6
  50 #define MC13783_POWER_CONTROL_2_ON3BDBNC        8
  51 #define MC13783_POWER_CONTROL_2_ON1BRSTEN       (1 << 1)
  52 #define MC13783_POWER_CONTROL_2_ON2BRSTEN       (1 << 2)
  53 #define MC13783_POWER_CONTROL_2_ON3BRSTEN       (1 << 3)
  54
  55 static irqreturn_t button_irq(int irq, void *_priv)
  56 {
  57         struct mc13783_pwrb *priv = _priv;
  58         int val;
  59
  60         mc13xxx_irq_ack(priv->mc13783, irq);
  61         mc13xxx_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_SENSE_1, &val);
  62
  63         switch (irq) {
  64         case MC13783_IRQ_ONOFD1:
  65                 val = val & MC13783_IRQSENSE1_ONOFD1S ? 1 : 0;
  66                 if (priv->flags & MC13783_PWRB_B1_POL_INVERT)
  67                         val ^= 1;
  68                 input_report_key(priv->pwr, priv->keymap[0], val);
  69                 break;
  70
  71         case MC13783_IRQ_ONOFD2:
  72                 val = val & MC13783_IRQSENSE1_ONOFD2S ? 1 : 0;
  73                 if (priv->flags & MC13783_PWRB_B2_POL_INVERT)
  74                         val ^= 1;
  75                 input_report_key(priv->pwr, priv->keymap[1], val);
  76                 break;
  77
  78         case MC13783_IRQ_ONOFD3:
  79                 val = val & MC13783_IRQSENSE1_ONOFD3S ? 1 : 0;
  80                 if (priv->flags & MC13783_PWRB_B3_POL_INVERT)
  81                         val ^= 1;
  82                 input_report_key(priv->pwr, priv->keymap[2], val);
  83                 break;
  84         }
  85
  86         input_sync(priv->pwr);
  87
  88         return IRQ_HANDLED;
  89 }
  90
  91 static int mc13783_pwrbutton_probe(struct platform_device *pdev)
  92 {
  93         const struct mc13xxx_buttons_platform_data *pdata;
  94         struct mc13xxx *mc13783 = dev_get_drvdata(pdev->dev.parent);
  95         struct input_dev *pwr;
  96         struct mc13783_pwrb *priv;
  97         int err = 0;
  98         int reg = 0;
  99
 100         pdata = dev_get_platdata(&pdev->dev);
 101         if (!pdata) {
 102                 dev_err(&pdev->dev, "missing platform data\n");
 103                 return -ENODEV;
 104         }
 105
 106         pwr = input_allocate_device();
 107         if (!pwr) {
 108                 dev_dbg(&pdev->dev, "Can't allocate power button\n");
 109                 return -ENOMEM;
 110         }
 111
 112         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 113         if (!priv) {
 114                 err = -ENOMEM;
 115                 dev_dbg(&pdev->dev, "Can't allocate power button\n");
 116                 goto free_input_dev;
 117         }
 118
 119         reg |= (pdata->b1on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON1BDBNC;
 120         reg |= (pdata->b2on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON2BDBNC;
 121         reg |= (pdata->b3on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON3BDBNC;
 122
 123         priv->pwr = pwr;
 124         priv->mc13783 = mc13783;
 125
 126         mc13xxx_lock(mc13783);
 127
 128         if (pdata->b1on_flags & MC13783_BUTTON_ENABLE) {
 129                 priv->keymap[0] = pdata->b1on_key;
 130                 if (pdata->b1on_key != KEY_RESERVED)
 131                         __set_bit(pdata->b1on_key, pwr->keybit);
 132
 133                 if (pdata->b1on_flags & MC13783_BUTTON_POL_INVERT)
 134                         priv->flags |= MC13783_PWRB_B1_POL_INVERT;
 135
 136                 if (pdata->b1on_flags & MC13783_BUTTON_RESET_EN)
 137                         reg |= MC13783_POWER_CONTROL_2_ON1BRSTEN;
 138
 139                 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD1,
 140                                           button_irq, "b1on", priv);
 141                 if (err) {
 142                         dev_dbg(&pdev->dev, "Can't request irq\n");
 143                         goto free_priv;
 144                 }
 145         }
 146
 147         if (pdata->b2on_flags & MC13783_BUTTON_ENABLE) {
 148                 priv->keymap[1] = pdata->b2on_key;
 149                 if (pdata->b2on_key != KEY_RESERVED)
 150                         __set_bit(pdata->b2on_key, pwr->keybit);
 151
 152                 if (pdata->b2on_flags & MC13783_BUTTON_POL_INVERT)
 153                         priv->flags |= MC13783_PWRB_B2_POL_INVERT;
 154
 155                 if (pdata->b2on_flags & MC13783_BUTTON_RESET_EN)
 156                         reg |= MC13783_POWER_CONTROL_2_ON2BRSTEN;
 157
 158                 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD2,
 159                                           button_irq, "b2on", priv);
 160                 if (err) {
 161                         dev_dbg(&pdev->dev, "Can't request irq\n");
 162                         goto free_irq_b1;
 163                 }
 164         }
 165
 166         if (pdata->b3on_flags & MC13783_BUTTON_ENABLE) {
 167                 priv->keymap[2] = pdata->b3on_key;
 168                 if (pdata->b3on_key != KEY_RESERVED)
 169                         __set_bit(pdata->b3on_key, pwr->keybit);
 170
 171                 if (pdata->b3on_flags & MC13783_BUTTON_POL_INVERT)
 172                         priv->flags |= MC13783_PWRB_B3_POL_INVERT;
 173
 174                 if (pdata->b3on_flags & MC13783_BUTTON_RESET_EN)
 175                         reg |= MC13783_POWER_CONTROL_2_ON3BRSTEN;
 176
 177                 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD3,
 178                                           button_irq, "b3on", priv);
 179                 if (err) {
 180                         dev_dbg(&pdev->dev, "Can't request irq: %d\n", err);
 181                         goto free_irq_b2;
 182                 }
 183         }
 184
 185         mc13xxx_reg_rmw(mc13783, MC13783_REG_POWER_CONTROL_2, 0x3FE, reg);
 186
 187         mc13xxx_unlock(mc13783);
 188
 189         pwr->name = "mc13783_pwrbutton";
 190         pwr->phys = "mc13783_pwrbutton/input0";
 191         pwr->dev.parent = &pdev->dev;
 192
 193         pwr->keycode = priv->keymap;
 194         pwr->keycodemax = ARRAY_SIZE(priv->keymap);
 195         pwr->keycodesize = sizeof(priv->keymap[0]);
 196         __set_bit(EV_KEY, pwr->evbit);
 197
 198         err = input_register_device(pwr);
 199         if (err) {
 200                 dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
 201                 goto free_irq;
 202         }
 203
 204         platform_set_drvdata(pdev, priv);
 205
 206         return 0;
 207
 208 free_irq:
 209         mc13xxx_lock(mc13783);
 210
 211         if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
 212                 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD3, priv);
 213
 214 free_irq_b2:
 215         if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
 216                 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD2, priv);
 217
 218 free_irq_b1:
 219         if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
 220                 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD1, priv);
 221
 222 free_priv:
 223         mc13xxx_unlock(mc13783);
 224         kfree(priv);
 225
 226 free_input_dev:
 227         input_free_device(pwr);
 228
 229         return err;
 230 }
 231
 232 static int mc13783_pwrbutton_remove(struct platform_device *pdev)
 233 {
 234         struct mc13783_pwrb *priv = platform_get_drvdata(pdev);
 235         const struct mc13xxx_buttons_platform_data *pdata;
 236
 237         pdata = dev_get_platdata(&pdev->dev);
 238
 239         mc13xxx_lock(priv->mc13783);
 240
 241         if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
 242                 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD3, priv);
 243         if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
 244                 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD2, priv);
 245         if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
 246                 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD1, priv);
 247
 248         mc13xxx_unlock(priv->mc13783);
 249
 250         input_unregister_device(priv->pwr);
 251         kfree(priv);
 252
 253         return 0;
 254 }
 255
 256 static struct platform_driver mc13783_pwrbutton_driver = {
 257         .probe          = mc13783_pwrbutton_probe,
 258         .remove         = mc13783_pwrbutton_remove,
 259         .driver         = {
 260                 .name   = "mc13783-pwrbutton",
 261                 .owner  = THIS_MODULE,
 262         },
 263 };
 264
 265 module_platform_driver(mc13783_pwrbutton_driver);
 266
 267 MODULE_ALIAS("platform:mc13783-pwrbutton");
 268 MODULE_DESCRIPTION("MC13783 Power Button");
 269 MODULE_LICENSE("GPL v2");
 270 MODULE_AUTHOR("Philippe Retornaz");