Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 1 | /* |
| 2 | * SuperH KEYSC Keypad Driver |
| 3 | * |
| 4 | * Copyright (C) 2008 Magnus Damm |
| 5 | * |
| 6 | * Based on gpio_keys.c, Copyright 2005 Phil Blundell |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/irq.h> |
| 18 | #include <linux/delay.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/input.h> |
| 21 | #include <linux/io.h> |
| 22 | #include <asm/sh_keysc.h> |
| 23 | |
| 24 | #define KYCR1_OFFS 0x00 |
| 25 | #define KYCR2_OFFS 0x04 |
| 26 | #define KYINDR_OFFS 0x08 |
| 27 | #define KYOUTDR_OFFS 0x0c |
| 28 | |
| 29 | #define KYCR2_IRQ_LEVEL 0x10 |
| 30 | #define KYCR2_IRQ_DISABLED 0x00 |
| 31 | |
| 32 | static const struct { |
| 33 | unsigned char kymd, keyout, keyin; |
| 34 | } sh_keysc_mode[] = { |
| 35 | [SH_KEYSC_MODE_1] = { 0, 6, 5 }, |
| 36 | [SH_KEYSC_MODE_2] = { 1, 5, 6 }, |
| 37 | [SH_KEYSC_MODE_3] = { 2, 4, 7 }, |
| 38 | }; |
| 39 | |
| 40 | struct sh_keysc_priv { |
| 41 | void __iomem *iomem_base; |
| 42 | unsigned long last_keys; |
| 43 | struct input_dev *input; |
| 44 | struct sh_keysc_info pdata; |
| 45 | }; |
| 46 | |
| 47 | static irqreturn_t sh_keysc_isr(int irq, void *dev_id) |
| 48 | { |
| 49 | struct platform_device *pdev = dev_id; |
| 50 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); |
| 51 | struct sh_keysc_info *pdata = &priv->pdata; |
| 52 | unsigned long keys, keys1, keys0, mask; |
| 53 | unsigned char keyin_set, tmp; |
| 54 | int i, k; |
| 55 | |
| 56 | dev_dbg(&pdev->dev, "isr!\n"); |
| 57 | |
| 58 | keys1 = ~0; |
| 59 | keys0 = 0; |
| 60 | |
| 61 | do { |
| 62 | keys = 0; |
| 63 | keyin_set = 0; |
| 64 | |
| 65 | iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS); |
| 66 | |
| 67 | for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) { |
| 68 | iowrite16(0xfff ^ (3 << (i * 2)), |
| 69 | priv->iomem_base + KYOUTDR_OFFS); |
| 70 | udelay(pdata->delay); |
| 71 | tmp = ioread16(priv->iomem_base + KYINDR_OFFS); |
| 72 | keys |= tmp << (sh_keysc_mode[pdata->mode].keyin * i); |
| 73 | tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1; |
| 74 | keyin_set |= tmp; |
| 75 | } |
| 76 | |
| 77 | iowrite16(0, priv->iomem_base + KYOUTDR_OFFS); |
| 78 | iowrite16(KYCR2_IRQ_LEVEL | (keyin_set << 8), |
| 79 | priv->iomem_base + KYCR2_OFFS); |
| 80 | |
| 81 | keys ^= ~0; |
| 82 | keys &= (1 << (sh_keysc_mode[pdata->mode].keyin * |
| 83 | sh_keysc_mode[pdata->mode].keyout)) - 1; |
| 84 | keys1 &= keys; |
| 85 | keys0 |= keys; |
| 86 | |
| 87 | dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys); |
| 88 | |
| 89 | } while (ioread16(priv->iomem_base + KYCR2_OFFS) & 0x01); |
| 90 | |
| 91 | dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n", |
| 92 | priv->last_keys, keys0, keys1); |
| 93 | |
| 94 | for (i = 0; i < SH_KEYSC_MAXKEYS; i++) { |
| 95 | k = pdata->keycodes[i]; |
| 96 | if (!k) |
| 97 | continue; |
| 98 | |
| 99 | mask = 1 << i; |
| 100 | |
| 101 | if (!((priv->last_keys ^ keys0) & mask)) |
| 102 | continue; |
| 103 | |
| 104 | if ((keys1 | keys0) & mask) { |
| 105 | input_event(priv->input, EV_KEY, k, 1); |
| 106 | priv->last_keys |= mask; |
| 107 | } |
| 108 | |
| 109 | if (!(keys1 & mask)) { |
| 110 | input_event(priv->input, EV_KEY, k, 0); |
| 111 | priv->last_keys &= ~mask; |
| 112 | } |
| 113 | |
| 114 | } |
| 115 | input_sync(priv->input); |
| 116 | |
| 117 | return IRQ_HANDLED; |
| 118 | } |
| 119 | |
| 120 | #define res_size(res) ((res)->end - (res)->start + 1) |
| 121 | |
| 122 | static int __devinit sh_keysc_probe(struct platform_device *pdev) |
| 123 | { |
| 124 | struct sh_keysc_priv *priv; |
| 125 | struct sh_keysc_info *pdata; |
| 126 | struct resource *res; |
| 127 | struct input_dev *input; |
| 128 | int i, k; |
| 129 | int irq, error; |
| 130 | |
| 131 | if (!pdev->dev.platform_data) { |
| 132 | dev_err(&pdev->dev, "no platform data defined\n"); |
| 133 | error = -EINVAL; |
| 134 | goto err0; |
| 135 | } |
| 136 | |
| 137 | error = -ENXIO; |
| 138 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 139 | if (res == NULL) { |
| 140 | dev_err(&pdev->dev, "failed to get I/O memory\n"); |
| 141 | goto err0; |
| 142 | } |
| 143 | |
| 144 | irq = platform_get_irq(pdev, 0); |
| 145 | if (irq < 0) { |
| 146 | dev_err(&pdev->dev, "failed to get irq\n"); |
| 147 | goto err0; |
| 148 | } |
| 149 | |
| 150 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 151 | if (priv == NULL) { |
| 152 | dev_err(&pdev->dev, "failed to allocate driver data\n"); |
| 153 | error = -ENOMEM; |
| 154 | goto err0; |
| 155 | } |
| 156 | |
| 157 | platform_set_drvdata(pdev, priv); |
| 158 | memcpy(&priv->pdata, pdev->dev.platform_data, sizeof(priv->pdata)); |
| 159 | pdata = &priv->pdata; |
| 160 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 161 | priv->iomem_base = ioremap_nocache(res->start, res_size(res)); |
| 162 | if (priv->iomem_base == NULL) { |
| 163 | dev_err(&pdev->dev, "failed to remap I/O memory\n"); |
| 164 | error = -ENXIO; |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame^] | 165 | goto err1; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | priv->input = input_allocate_device(); |
| 169 | if (!priv->input) { |
| 170 | dev_err(&pdev->dev, "failed to allocate input device\n"); |
| 171 | error = -ENOMEM; |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame^] | 172 | goto err2; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 173 | } |
| 174 | |
| 175 | input = priv->input; |
| 176 | input->evbit[0] = BIT_MASK(EV_KEY); |
| 177 | |
| 178 | input->name = pdev->name; |
| 179 | input->phys = "sh-keysc-keys/input0"; |
| 180 | input->dev.parent = &pdev->dev; |
| 181 | |
| 182 | input->id.bustype = BUS_HOST; |
| 183 | input->id.vendor = 0x0001; |
| 184 | input->id.product = 0x0001; |
| 185 | input->id.version = 0x0100; |
| 186 | |
| 187 | error = request_irq(irq, sh_keysc_isr, 0, pdev->name, pdev); |
| 188 | if (error) { |
| 189 | dev_err(&pdev->dev, "failed to request IRQ\n"); |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame^] | 190 | goto err3; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | for (i = 0; i < SH_KEYSC_MAXKEYS; i++) { |
| 194 | k = pdata->keycodes[i]; |
| 195 | if (k) |
| 196 | input_set_capability(input, EV_KEY, k); |
| 197 | } |
| 198 | |
| 199 | error = input_register_device(input); |
| 200 | if (error) { |
| 201 | dev_err(&pdev->dev, "failed to register input device\n"); |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame^] | 202 | goto err4; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | iowrite16((sh_keysc_mode[pdata->mode].kymd << 8) | |
| 206 | pdata->scan_timing, priv->iomem_base + KYCR1_OFFS); |
| 207 | iowrite16(0, priv->iomem_base + KYOUTDR_OFFS); |
| 208 | iowrite16(KYCR2_IRQ_LEVEL, priv->iomem_base + KYCR2_OFFS); |
| 209 | return 0; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 210 | err4: |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame^] | 211 | free_irq(irq, pdev); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 212 | err3: |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame^] | 213 | input_free_device(input); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 214 | err2: |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame^] | 215 | iounmap(priv->iomem_base); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 216 | err1: |
| 217 | platform_set_drvdata(pdev, NULL); |
| 218 | kfree(priv); |
| 219 | err0: |
| 220 | return error; |
| 221 | } |
| 222 | |
| 223 | static int __devexit sh_keysc_remove(struct platform_device *pdev) |
| 224 | { |
| 225 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 226 | |
| 227 | iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS); |
| 228 | |
| 229 | input_unregister_device(priv->input); |
| 230 | free_irq(platform_get_irq(pdev, 0), pdev); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 231 | iounmap(priv->iomem_base); |
| 232 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 233 | platform_set_drvdata(pdev, NULL); |
| 234 | kfree(priv); |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | |
| 239 | #define sh_keysc_suspend NULL |
| 240 | #define sh_keysc_resume NULL |
| 241 | |
| 242 | struct platform_driver sh_keysc_device_driver = { |
| 243 | .probe = sh_keysc_probe, |
| 244 | .remove = __devexit_p(sh_keysc_remove), |
| 245 | .suspend = sh_keysc_suspend, |
| 246 | .resume = sh_keysc_resume, |
| 247 | .driver = { |
| 248 | .name = "sh_keysc", |
| 249 | } |
| 250 | }; |
| 251 | |
| 252 | static int __init sh_keysc_init(void) |
| 253 | { |
| 254 | return platform_driver_register(&sh_keysc_device_driver); |
| 255 | } |
| 256 | |
| 257 | static void __exit sh_keysc_exit(void) |
| 258 | { |
| 259 | platform_driver_unregister(&sh_keysc_device_driver); |
| 260 | } |
| 261 | |
| 262 | module_init(sh_keysc_init); |
| 263 | module_exit(sh_keysc_exit); |
| 264 | |
| 265 | MODULE_AUTHOR("Magnus Damm"); |
| 266 | MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver"); |
| 267 | MODULE_LICENSE("GPL"); |