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/init.h>
  24 #include <linux/kernel.h>
  25 #include <linux/errno.h>
  26 #include <linux/input.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/mfd/mc13783.h>
  30 #include <linux/sched.h>
  31 #include <linux/slab.h>
  32
  33 struct mc13783_pwrb {
  34         struct input_dev *pwr;
  35         struct mc13xxx *mc13783;
  36 #define MC13783_PWRB_B1_POL_INVERT      (1 << 0)
  37 #define MC13783_PWRB_B2_POL_INVERT      (1 << 1)
  38 #define MC13783_PWRB_B3_POL_INVERT      (1 << 2)
  39         int flags;
  40         unsigned short keymap[3];
  41 };
  42
  43 #define MC13783_REG_INTERRUPT_SENSE_1           5
  44 #define MC13783_IRQSENSE1_ONOFD1S               (1 << 3)
  45 #define MC13783_IRQSENSE1_ONOFD2S               (1 << 4)
  46 #define MC13783_IRQSENSE1_ONOFD3S               (1 << 5)
  47
  48 #define MC13783_REG_POWER_CONTROL_2             15
  49 #define MC13783_POWER_CONTROL_2_ON1BDBNC        4
  50 #define MC13783_POWER_CONTROL_2_ON2BDBNC        6
  51 #define MC13783_POWER_CONTROL_2_ON3BDBNC        8
  52 #define MC13783_POWER_CONTROL_2_ON1BRSTEN       (1 << 1)
  53 #define MC13783_POWER_CONTROL_2_ON2BRSTEN       (1 << 2)
  54 #define MC13783_POWER_CONTROL_2_ON3BRSTEN       (1 << 3)
  55
  56 static irqreturn_t button_irq(int irq, void *_priv)
  57 {
  58         struct mc13783_pwrb *priv = _priv;
  59         int val;
  60
  61         mc13xxx_irq_ack(priv->mc13783, irq);
  62         mc13xxx_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_SENSE_1, &val);
  63
  64         switch (irq) {
  65         case MC13783_IRQ_ONOFD1:
  66                 val = val & MC13783_IRQSENSE1_ONOFD1S ? 1 : 0;
  67                 if (priv->flags & MC13783_PWRB_B1_POL_INVERT)
  68                         val ^= 1;
  69                 input_report_key(priv->pwr, priv->keymap[0], val);
  70                 break;
  71
  72         case MC13783_IRQ_ONOFD2:
  73                 val = val & MC13783_IRQSENSE1_ONOFD2S ? 1 : 0;
  74                 if (priv->flags & MC13783_PWRB_B2_POL_INVERT)
  75                         val ^= 1;
  76                 input_report_key(priv->pwr, priv->keymap[1], val);
  77                 break;
  78
  79         case MC13783_IRQ_ONOFD3:
  80                 val = val & MC13783_IRQSENSE1_ONOFD3S ? 1 : 0;
  81                 if (priv->flags & MC13783_PWRB_B3_POL_INVERT)
  82                         val ^= 1;
  83                 input_report_key(priv->pwr, priv->keymap[2], val);
  84                 break;
  85         }
  86
  87         input_sync(priv->pwr);
  88
  89         return IRQ_HANDLED;
  90 }
  91
  92 static int mc13783_pwrbutton_probe(struct platform_device *pdev)
  93 {
  94         const struct mc13xxx_buttons_platform_data *pdata;
  95         struct mc13xxx *mc13783 = dev_get_drvdata(pdev->dev.parent);
  96         struct input_dev *pwr;
  97         struct mc13783_pwrb *priv;
  98         int err = 0;
  99         int reg = 0;
 100
 101         pdata = dev_get_platdata(&pdev->dev);
 102         if (!pdata) {
 103                 dev_err(&pdev->dev, "missing platform data\n");
 104                 return -ENODEV;
 105         }
 106
 107         pwr = input_allocate_device();
 108         if (!pwr) {
 109                 dev_dbg(&pdev->dev, "Can't allocate power button\n");
 110                 return -ENOMEM;
 111         }
 112
 113         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 114         if (!priv) {
 115                 err = -ENOMEM;
 116                 dev_dbg(&pdev->dev, "Can't allocate power button\n");
 117                 goto free_input_dev;
 118         }
 119
 120         reg |= (pdata->b1on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON1BDBNC;
 121         reg |= (pdata->b2on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON2BDBNC;
 122         reg |= (pdata->b3on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON3BDBNC;
 123
 124         priv->pwr = pwr;
 125         priv->mc13783 = mc13783;
 126
 127         mc13xxx_lock(mc13783);
 128
 129         if (pdata->b1on_flags & MC13783_BUTTON_ENABLE) {
 130                 priv->keymap[0] = pdata->b1on_key;
 131                 if (pdata->b1on_key != KEY_RESERVED)
 132                         __set_bit(pdata->b1on_key, pwr->keybit);
 133
 134                 if (pdata->b1on_flags & MC13783_BUTTON_POL_INVERT)
 135                         priv->flags |= MC13783_PWRB_B1_POL_INVERT;
 136
 137                 if (pdata->b1on_flags & MC13783_BUTTON_RESET_EN)
 138                         reg |= MC13783_POWER_CONTROL_2_ON1BRSTEN;
 139
 140                 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD1,
 141                                           button_irq, "b1on", priv);
 142                 if (err) {
 143                         dev_dbg(&pdev->dev, "Can't request irq\n");
 144                         goto free_priv;
 145                 }
 146         }
 147
 148         if (pdata->b2on_flags & MC13783_BUTTON_ENABLE) {
 149                 priv->keymap[1] = pdata->b2on_key;
 150                 if (pdata->b2on_key != KEY_RESERVED)
 151                         __set_bit(pdata->b2on_key, pwr->keybit);
 152
 153                 if (pdata->b2on_flags & MC13783_BUTTON_POL_INVERT)
 154                         priv->flags |= MC13783_PWRB_B2_POL_INVERT;
 155
 156                 if (pdata->b2on_flags & MC13783_BUTTON_RESET_EN)
 157                         reg |= MC13783_POWER_CONTROL_2_ON2BRSTEN;
 158
 159                 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD2,
 160                                           button_irq, "b2on", priv);
 161                 if (err) {
 162                         dev_dbg(&pdev->dev, "Can't request irq\n");
 163                         goto free_irq_b1;
 164                 }
 165         }
 166
 167         if (pdata->b3on_flags & MC13783_BUTTON_ENABLE) {
 168                 priv->keymap[2] = pdata->b3on_key;
 169                 if (pdata->b3on_key != KEY_RESERVED)
 170                         __set_bit(pdata->b3on_key, pwr->keybit);
 171
 172                 if (pdata->b3on_flags & MC13783_BUTTON_POL_INVERT)
 173                         priv->flags |= MC13783_PWRB_B3_POL_INVERT;
 174
 175                 if (pdata->b3on_flags & MC13783_BUTTON_RESET_EN)
 176                         reg |= MC13783_POWER_CONTROL_2_ON3BRSTEN;
 177
 178                 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD3,
 179                                           button_irq, "b3on", priv);
 180                 if (err) {
 181                         dev_dbg(&pdev->dev, "Can't request irq: %d\n", err);
 182                         goto free_irq_b2;
 183                 }
 184         }
 185
 186         mc13xxx_reg_rmw(mc13783, MC13783_REG_POWER_CONTROL_2, 0x3FE, reg);
 187
 188         mc13xxx_unlock(mc13783);
 189
 190         pwr->name = "mc13783_pwrbutton";
 191         pwr->phys = "mc13783_pwrbutton/input0";
 192         pwr->dev.parent = &pdev->dev;
 193
 194         pwr->keycode = priv->keymap;
 195         pwr->keycodemax = ARRAY_SIZE(priv->keymap);
 196         pwr->keycodesize = sizeof(priv->keymap[0]);
 197         __set_bit(EV_KEY, pwr->evbit);
 198
 199         err = input_register_device(pwr);
 200         if (err) {
 201                 dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
 202                 goto free_irq;
 203         }
 204
 205         platform_set_drvdata(pdev, priv);
 206
 207         return 0;
 208
 209 free_irq:
 210         mc13xxx_lock(mc13783);
 211
 212         if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
 213                 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD3, priv);
 214
 215 free_irq_b2:
 216         if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
 217                 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD2, priv);
 218
 219 free_irq_b1:
 220         if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
 221                 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD1, priv);
 222
 223 free_priv:
 224         mc13xxx_unlock(mc13783);
 225         kfree(priv);
 226
 227 free_input_dev:
 228         input_free_device(pwr);
 229
 230         return err;
 231 }
 232
 233 static int mc13783_pwrbutton_remove(struct platform_device *pdev)
 234 {
 235         struct mc13783_pwrb *priv = platform_get_drvdata(pdev);
 236         const struct mc13xxx_buttons_platform_data *pdata;
 237
 238         pdata = dev_get_platdata(&pdev->dev);
 239
 240         mc13xxx_lock(priv->mc13783);
 241
 242         if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
 243                 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD3, priv);
 244         if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
 245                 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD2, priv);
 246         if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
 247                 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD1, priv);
 248
 249         mc13xxx_unlock(priv->mc13783);
 250
 251         input_unregister_device(priv->pwr);
 252         kfree(priv);
 253
 254         return 0;
 255 }
 256
 257 static struct platform_driver mc13783_pwrbutton_driver = {
 258         .probe          = mc13783_pwrbutton_probe,
 259         .remove         = mc13783_pwrbutton_remove,
 260         .driver         = {
 261                 .name   = "mc13783-pwrbutton",
 262                 .owner  = THIS_MODULE,
 263         },
 264 };
 265
 266 module_platform_driver(mc13783_pwrbutton_driver);
 267
 268 MODULE_ALIAS("platform:mc13783-pwrbutton");
 269 MODULE_DESCRIPTION("MC13783 Power Button");
 270 MODULE_LICENSE("GPL v2");
 271 MODULE_AUTHOR("Philippe Retornaz");