109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <init.h>
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#include <malloc.h>
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#include <poller.h>
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#include <kfifo.h>
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#include <mfd/twl6030.h>
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#include <twl6030_pwrbtn.h>
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struct twl6030_pwrbtn_internal_data {
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int code;
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u8 previous_state;
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struct twl6030 *twl6030;
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struct kfifo *recv_fifo;
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struct console_device cdev;
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struct poller_struct poller;
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};
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#define PWR_PWRON_IRQ (1 << 0)
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static void ic2_key_poller(struct poller_struct *poller)
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{
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struct twl6030_pwrbtn_internal_data *idata = container_of(
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poller, struct twl6030_pwrbtn_internal_data, poller);
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u8 val;
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if (twl6030_reg_read(idata->twl6030, TWL6030_PMCM_HW, &val)) {
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dev_err(idata->cdev.dev, "reading i2c\n");
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return;
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}
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val = !(val & PWR_PWRON_IRQ);
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if (val != idata->previous_state && val) {
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kfifo_put(idata->recv_fifo, (u_char *)&idata->code,
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sizeof(int));
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dev_dbg(idata->cdev.dev, "pressed power button as %d\n",
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idata->code);
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}
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idata->previous_state = val;
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}
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static int twl6030_pwrbtn_tstc(struct console_device *cdev)
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{
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struct twl6030_pwrbtn_internal_data *idata = container_of(
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cdev, struct twl6030_pwrbtn_internal_data, cdev);
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return kfifo_len(idata->recv_fifo) ? 1 : 0;
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}
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static int twl6030_pwrbtn_getc(struct console_device *cdev)
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{
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int code = 0;
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struct twl6030_pwrbtn_internal_data *idata = container_of(
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cdev, struct twl6030_pwrbtn_internal_data, cdev);
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kfifo_get(idata->recv_fifo, (u_char *)&code, sizeof(int));
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return code;
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}
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static int __init twl6030_pwrbtn_probe(struct device_d *dev)
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{
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struct twl6030_pwrbtn_internal_data *idata;
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struct twl6030_pwrbtn_platform_data *pdata;
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pdata = dev->platform_data;
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if (!pdata) {
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dev_err(dev, "missing platform_data\n");
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return -ENODEV;
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}
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idata = xzalloc(sizeof(struct twl6030_pwrbtn_internal_data));
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idata->recv_fifo = kfifo_alloc(sizeof(int));
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if (!idata->recv_fifo) {
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dev_err(dev, "out of memory allocating kfifo\n");
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free(idata);
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return -ENOMEM;
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}
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idata->code = pdata->code;
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idata->twl6030 = twl6030_get();
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idata->poller.func = ic2_key_poller;
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dev->type_data = &idata->cdev;
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idata->cdev.dev = dev;
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idata->cdev.f_caps = CONSOLE_STDIN;
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idata->cdev.tstc = twl6030_pwrbtn_tstc;
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idata->cdev.getc = twl6030_pwrbtn_getc;
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console_register(&idata->cdev);
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return poller_register(&idata->poller);
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}
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static struct driver_d twl6030_pwrbtn_driver = {
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.name = "twl6030_pwrbtn",
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.probe = twl6030_pwrbtn_probe,
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};
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device_platform_driver(twl6030_pwrbtn_driver);
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