linux/drivers/input/misc/mc13783-pwrbutton.c
<<
>>
Prefs
   1/*
   2 * Copyright (C) 2011 Philippe R\xC3\xA9tornaz
   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
  32struct 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
  55static 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
  91static 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
 208free_irq:
 209        mc13xxx_lock(mc13783);
 210
 211        if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
 212                mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD3, priv);
 213
 214free_irq_b2:
 215        if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
 216                mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD2, priv);
 217
 218free_irq_b1:
 219        if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
 220                mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD1, priv);
 221
 222free_priv:
 223        mc13xxx_unlock(mc13783);
 224        kfree(priv);
 225
 226free_input_dev:
 227        input_free_device(pwr);
 228
 229        return err;
 230}
 231
 232static 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
 256static struct platform_driver mc13783_pwrbutton_driver = {
 257        .probe          = mc13783_pwrbutton_probe,
 258        .remove         = mc13783_pwrbutton_remove,
 259        .driver         = {
 260                .name   = "mc13783-pwrbutton",
 261        },
 262};
 263
 264module_platform_driver(mc13783_pwrbutton_driver);
 265
 266MODULE_ALIAS("platform:mc13783-pwrbutton");
 267MODULE_DESCRIPTION("MC13783 Power Button");
 268MODULE_LICENSE("GPL v2");
 269MODULE_AUTHOR("Philippe Retornaz");
 270