^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * wm831x-on.c - WM831X ON pin driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2009 Wolfson Microelectronics plc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * This file is subject to the terms and conditions of the GNU General
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Public License. See the file "COPYING" in the main directory of this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * archive for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * This program is distributed in the hope that it will be useful,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * but WITHOUT ANY WARRANTY; without even the implied warranty of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * GNU General Public License for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * You should have received a copy of the GNU General Public License
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * along with this program; if not, write to the Free Software
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/mfd/wm831x/core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct wm831x_on {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct input_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct delayed_work work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct wm831x *wm831x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * The chip gives us an interrupt when the ON pin is asserted but we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * then need to poll to see when the pin is deasserted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static void wm831x_poll_on(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct wm831x_on *wm831x_on = container_of(work, struct wm831x_on,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) work.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct wm831x *wm831x = wm831x_on->wm831x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) int poll, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) ret = wm831x_reg_read(wm831x, WM831X_ON_PIN_CONTROL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (ret >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) poll = !(ret & WM831X_ON_PIN_STS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) input_report_key(wm831x_on->dev, KEY_POWER, poll);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) input_sync(wm831x_on->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) dev_err(wm831x->dev, "Failed to read ON status: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) poll = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (poll)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) schedule_delayed_work(&wm831x_on->work, 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static irqreturn_t wm831x_on_irq(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct wm831x_on *wm831x_on = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) schedule_delayed_work(&wm831x_on->work, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static int wm831x_on_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct wm831x_on *wm831x_on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) wm831x_on = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_on),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (!wm831x_on) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) dev_err(&pdev->dev, "Can't allocate data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) wm831x_on->wm831x = wm831x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) INIT_DELAYED_WORK(&wm831x_on->work, wm831x_poll_on);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) wm831x_on->dev = devm_input_allocate_device(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (!wm831x_on->dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) dev_err(&pdev->dev, "Can't allocate input dev\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) wm831x_on->dev->evbit[0] = BIT_MASK(EV_KEY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) wm831x_on->dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) wm831x_on->dev->name = "wm831x_on";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) wm831x_on->dev->phys = "wm831x_on/input0";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) wm831x_on->dev->dev.parent = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ret = request_threaded_irq(irq, NULL, wm831x_on_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) IRQF_TRIGGER_RISING | IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) "wm831x_on",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) wm831x_on);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) dev_err(&pdev->dev, "Unable to request IRQ: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) goto err_input_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) ret = input_register_device(wm831x_on->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) dev_dbg(&pdev->dev, "Can't register input device: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) goto err_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) platform_set_drvdata(pdev, wm831x_on);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) err_irq:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) free_irq(irq, wm831x_on);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) err_input_dev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int wm831x_on_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct wm831x_on *wm831x_on = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) int irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) free_irq(irq, wm831x_on);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) cancel_delayed_work_sync(&wm831x_on->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static struct platform_driver wm831x_on_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .probe = wm831x_on_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .remove = wm831x_on_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) .name = "wm831x-on",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) module_platform_driver(wm831x_on_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) MODULE_ALIAS("platform:wm831x-on");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) MODULE_DESCRIPTION("WM831x ON pin");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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