X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Finput%2Fkeyboard%2Fsh_keysc.c;fp=kernel%2Fdrivers%2Finput%2Fkeyboard%2Fsh_keysc.c;h=7abf03b4cc9c75ea72452439a61aad326d1e6195;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/input/keyboard/sh_keysc.c b/kernel/drivers/input/keyboard/sh_keysc.c new file mode 100644 index 000000000..7abf03b4c --- /dev/null +++ b/kernel/drivers/input/keyboard/sh_keysc.c @@ -0,0 +1,341 @@ +/* + * SuperH KEYSC Keypad Driver + * + * Copyright (C) 2008 Magnus Damm + * + * Based on gpio_keys.c, Copyright 2005 Phil Blundell + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static const struct { + unsigned char kymd, keyout, keyin; +} sh_keysc_mode[] = { + [SH_KEYSC_MODE_1] = { 0, 6, 5 }, + [SH_KEYSC_MODE_2] = { 1, 5, 6 }, + [SH_KEYSC_MODE_3] = { 2, 4, 7 }, + [SH_KEYSC_MODE_4] = { 3, 6, 6 }, + [SH_KEYSC_MODE_5] = { 4, 6, 7 }, + [SH_KEYSC_MODE_6] = { 5, 8, 8 }, +}; + +struct sh_keysc_priv { + void __iomem *iomem_base; + DECLARE_BITMAP(last_keys, SH_KEYSC_MAXKEYS); + struct input_dev *input; + struct sh_keysc_info pdata; +}; + +#define KYCR1 0 +#define KYCR2 1 +#define KYINDR 2 +#define KYOUTDR 3 + +#define KYCR2_IRQ_LEVEL 0x10 +#define KYCR2_IRQ_DISABLED 0x00 + +static unsigned long sh_keysc_read(struct sh_keysc_priv *p, int reg_nr) +{ + return ioread16(p->iomem_base + (reg_nr << 2)); +} + +static void sh_keysc_write(struct sh_keysc_priv *p, int reg_nr, + unsigned long value) +{ + iowrite16(value, p->iomem_base + (reg_nr << 2)); +} + +static void sh_keysc_level_mode(struct sh_keysc_priv *p, + unsigned long keys_set) +{ + struct sh_keysc_info *pdata = &p->pdata; + + sh_keysc_write(p, KYOUTDR, 0); + sh_keysc_write(p, KYCR2, KYCR2_IRQ_LEVEL | (keys_set << 8)); + + if (pdata->kycr2_delay) + udelay(pdata->kycr2_delay); +} + +static void sh_keysc_map_dbg(struct device *dev, unsigned long *map, + const char *str) +{ + int k; + + for (k = 0; k < BITS_TO_LONGS(SH_KEYSC_MAXKEYS); k++) + dev_dbg(dev, "%s[%d] 0x%lx\n", str, k, map[k]); +} + +static irqreturn_t sh_keysc_isr(int irq, void *dev_id) +{ + struct platform_device *pdev = dev_id; + struct sh_keysc_priv *priv = platform_get_drvdata(pdev); + struct sh_keysc_info *pdata = &priv->pdata; + int keyout_nr = sh_keysc_mode[pdata->mode].keyout; + int keyin_nr = sh_keysc_mode[pdata->mode].keyin; + DECLARE_BITMAP(keys, SH_KEYSC_MAXKEYS); + DECLARE_BITMAP(keys0, SH_KEYSC_MAXKEYS); + DECLARE_BITMAP(keys1, SH_KEYSC_MAXKEYS); + unsigned char keyin_set, tmp; + int i, k, n; + + dev_dbg(&pdev->dev, "isr!\n"); + + bitmap_fill(keys1, SH_KEYSC_MAXKEYS); + bitmap_zero(keys0, SH_KEYSC_MAXKEYS); + + do { + bitmap_zero(keys, SH_KEYSC_MAXKEYS); + keyin_set = 0; + + sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED); + + for (i = 0; i < keyout_nr; i++) { + n = keyin_nr * i; + + /* drive one KEYOUT pin low, read KEYIN pins */ + sh_keysc_write(priv, KYOUTDR, 0xffff ^ (3 << (i * 2))); + udelay(pdata->delay); + tmp = sh_keysc_read(priv, KYINDR); + + /* set bit if key press has been detected */ + for (k = 0; k < keyin_nr; k++) { + if (tmp & (1 << k)) + __set_bit(n + k, keys); + } + + /* keep track of which KEYIN bits that have been set */ + keyin_set |= tmp ^ ((1 << keyin_nr) - 1); + } + + sh_keysc_level_mode(priv, keyin_set); + + bitmap_complement(keys, keys, SH_KEYSC_MAXKEYS); + bitmap_and(keys1, keys1, keys, SH_KEYSC_MAXKEYS); + bitmap_or(keys0, keys0, keys, SH_KEYSC_MAXKEYS); + + sh_keysc_map_dbg(&pdev->dev, keys, "keys"); + + } while (sh_keysc_read(priv, KYCR2) & 0x01); + + sh_keysc_map_dbg(&pdev->dev, priv->last_keys, "last_keys"); + sh_keysc_map_dbg(&pdev->dev, keys0, "keys0"); + sh_keysc_map_dbg(&pdev->dev, keys1, "keys1"); + + for (i = 0; i < SH_KEYSC_MAXKEYS; i++) { + k = pdata->keycodes[i]; + if (!k) + continue; + + if (test_bit(i, keys0) == test_bit(i, priv->last_keys)) + continue; + + if (test_bit(i, keys1) || test_bit(i, keys0)) { + input_event(priv->input, EV_KEY, k, 1); + __set_bit(i, priv->last_keys); + } + + if (!test_bit(i, keys1)) { + input_event(priv->input, EV_KEY, k, 0); + __clear_bit(i, priv->last_keys); + } + + } + input_sync(priv->input); + + return IRQ_HANDLED; +} + +static int sh_keysc_probe(struct platform_device *pdev) +{ + struct sh_keysc_priv *priv; + struct sh_keysc_info *pdata; + struct resource *res; + struct input_dev *input; + int i; + int irq, error; + + if (!dev_get_platdata(&pdev->dev)) { + dev_err(&pdev->dev, "no platform data defined\n"); + error = -EINVAL; + goto err0; + } + + error = -ENXIO; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res == NULL) { + dev_err(&pdev->dev, "failed to get I/O memory\n"); + goto err0; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "failed to get irq\n"); + goto err0; + } + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (priv == NULL) { + dev_err(&pdev->dev, "failed to allocate driver data\n"); + error = -ENOMEM; + goto err0; + } + + platform_set_drvdata(pdev, priv); + memcpy(&priv->pdata, dev_get_platdata(&pdev->dev), sizeof(priv->pdata)); + pdata = &priv->pdata; + + priv->iomem_base = ioremap_nocache(res->start, resource_size(res)); + if (priv->iomem_base == NULL) { + dev_err(&pdev->dev, "failed to remap I/O memory\n"); + error = -ENXIO; + goto err1; + } + + priv->input = input_allocate_device(); + if (!priv->input) { + dev_err(&pdev->dev, "failed to allocate input device\n"); + error = -ENOMEM; + goto err2; + } + + input = priv->input; + input->evbit[0] = BIT_MASK(EV_KEY); + + input->name = pdev->name; + input->phys = "sh-keysc-keys/input0"; + input->dev.parent = &pdev->dev; + + input->id.bustype = BUS_HOST; + input->id.vendor = 0x0001; + input->id.product = 0x0001; + input->id.version = 0x0100; + + input->keycode = pdata->keycodes; + input->keycodesize = sizeof(pdata->keycodes[0]); + input->keycodemax = ARRAY_SIZE(pdata->keycodes); + + error = request_threaded_irq(irq, NULL, sh_keysc_isr, IRQF_ONESHOT, + dev_name(&pdev->dev), pdev); + if (error) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + goto err3; + } + + for (i = 0; i < SH_KEYSC_MAXKEYS; i++) + __set_bit(pdata->keycodes[i], input->keybit); + __clear_bit(KEY_RESERVED, input->keybit); + + error = input_register_device(input); + if (error) { + dev_err(&pdev->dev, "failed to register input device\n"); + goto err4; + } + + pm_runtime_enable(&pdev->dev); + pm_runtime_get_sync(&pdev->dev); + + sh_keysc_write(priv, KYCR1, (sh_keysc_mode[pdata->mode].kymd << 8) | + pdata->scan_timing); + sh_keysc_level_mode(priv, 0); + + device_init_wakeup(&pdev->dev, 1); + + return 0; + + err4: + free_irq(irq, pdev); + err3: + input_free_device(input); + err2: + iounmap(priv->iomem_base); + err1: + kfree(priv); + err0: + return error; +} + +static int sh_keysc_remove(struct platform_device *pdev) +{ + struct sh_keysc_priv *priv = platform_get_drvdata(pdev); + + sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED); + + input_unregister_device(priv->input); + free_irq(platform_get_irq(pdev, 0), pdev); + iounmap(priv->iomem_base); + + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + kfree(priv); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int sh_keysc_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct sh_keysc_priv *priv = platform_get_drvdata(pdev); + int irq = platform_get_irq(pdev, 0); + unsigned short value; + + value = sh_keysc_read(priv, KYCR1); + + if (device_may_wakeup(dev)) { + sh_keysc_write(priv, KYCR1, value | 0x80); + enable_irq_wake(irq); + } else { + sh_keysc_write(priv, KYCR1, value & ~0x80); + pm_runtime_put_sync(dev); + } + + return 0; +} + +static int sh_keysc_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + int irq = platform_get_irq(pdev, 0); + + if (device_may_wakeup(dev)) + disable_irq_wake(irq); + else + pm_runtime_get_sync(dev); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(sh_keysc_dev_pm_ops, + sh_keysc_suspend, sh_keysc_resume); + +static struct platform_driver sh_keysc_device_driver = { + .probe = sh_keysc_probe, + .remove = sh_keysc_remove, + .driver = { + .name = "sh_keysc", + .pm = &sh_keysc_dev_pm_ops, + } +}; +module_platform_driver(sh_keysc_device_driver); + +MODULE_AUTHOR("Magnus Damm"); +MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver"); +MODULE_LICENSE("GPL");