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> |
Magnus Damm | fc1d003 | 2009-11-27 07:32:24 +0000 | [diff] [blame] | 21 | #include <linux/input/sh_keysc.h> |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 22 | #include <linux/clk.h> |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 23 | #include <linux/io.h> |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 24 | |
| 25 | #define KYCR1_OFFS 0x00 |
| 26 | #define KYCR2_OFFS 0x04 |
| 27 | #define KYINDR_OFFS 0x08 |
| 28 | #define KYOUTDR_OFFS 0x0c |
| 29 | |
| 30 | #define KYCR2_IRQ_LEVEL 0x10 |
| 31 | #define KYCR2_IRQ_DISABLED 0x00 |
| 32 | |
| 33 | static const struct { |
| 34 | unsigned char kymd, keyout, keyin; |
| 35 | } sh_keysc_mode[] = { |
| 36 | [SH_KEYSC_MODE_1] = { 0, 6, 5 }, |
| 37 | [SH_KEYSC_MODE_2] = { 1, 5, 6 }, |
| 38 | [SH_KEYSC_MODE_3] = { 2, 4, 7 }, |
| 39 | }; |
| 40 | |
| 41 | struct sh_keysc_priv { |
| 42 | void __iomem *iomem_base; |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 43 | struct clk *clk; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 44 | unsigned long last_keys; |
| 45 | struct input_dev *input; |
| 46 | struct sh_keysc_info pdata; |
| 47 | }; |
| 48 | |
| 49 | static irqreturn_t sh_keysc_isr(int irq, void *dev_id) |
| 50 | { |
| 51 | struct platform_device *pdev = dev_id; |
| 52 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); |
| 53 | struct sh_keysc_info *pdata = &priv->pdata; |
| 54 | unsigned long keys, keys1, keys0, mask; |
| 55 | unsigned char keyin_set, tmp; |
| 56 | int i, k; |
| 57 | |
| 58 | dev_dbg(&pdev->dev, "isr!\n"); |
| 59 | |
| 60 | keys1 = ~0; |
| 61 | keys0 = 0; |
| 62 | |
| 63 | do { |
| 64 | keys = 0; |
| 65 | keyin_set = 0; |
| 66 | |
| 67 | iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS); |
| 68 | |
| 69 | for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) { |
| 70 | iowrite16(0xfff ^ (3 << (i * 2)), |
| 71 | priv->iomem_base + KYOUTDR_OFFS); |
| 72 | udelay(pdata->delay); |
| 73 | tmp = ioread16(priv->iomem_base + KYINDR_OFFS); |
| 74 | keys |= tmp << (sh_keysc_mode[pdata->mode].keyin * i); |
| 75 | tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1; |
| 76 | keyin_set |= tmp; |
| 77 | } |
| 78 | |
| 79 | iowrite16(0, priv->iomem_base + KYOUTDR_OFFS); |
| 80 | iowrite16(KYCR2_IRQ_LEVEL | (keyin_set << 8), |
| 81 | priv->iomem_base + KYCR2_OFFS); |
| 82 | |
Kuninori Morimoto | 1f85d38 | 2009-09-15 00:21:34 +0000 | [diff] [blame] | 83 | if (pdata->kycr2_delay) |
| 84 | udelay(pdata->kycr2_delay); |
| 85 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 86 | keys ^= ~0; |
| 87 | keys &= (1 << (sh_keysc_mode[pdata->mode].keyin * |
| 88 | sh_keysc_mode[pdata->mode].keyout)) - 1; |
| 89 | keys1 &= keys; |
| 90 | keys0 |= keys; |
| 91 | |
| 92 | dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys); |
| 93 | |
| 94 | } while (ioread16(priv->iomem_base + KYCR2_OFFS) & 0x01); |
| 95 | |
| 96 | dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n", |
| 97 | priv->last_keys, keys0, keys1); |
| 98 | |
| 99 | for (i = 0; i < SH_KEYSC_MAXKEYS; i++) { |
| 100 | k = pdata->keycodes[i]; |
| 101 | if (!k) |
| 102 | continue; |
| 103 | |
| 104 | mask = 1 << i; |
| 105 | |
| 106 | if (!((priv->last_keys ^ keys0) & mask)) |
| 107 | continue; |
| 108 | |
| 109 | if ((keys1 | keys0) & mask) { |
| 110 | input_event(priv->input, EV_KEY, k, 1); |
| 111 | priv->last_keys |= mask; |
| 112 | } |
| 113 | |
| 114 | if (!(keys1 & mask)) { |
| 115 | input_event(priv->input, EV_KEY, k, 0); |
| 116 | priv->last_keys &= ~mask; |
| 117 | } |
| 118 | |
| 119 | } |
| 120 | input_sync(priv->input); |
| 121 | |
| 122 | return IRQ_HANDLED; |
| 123 | } |
| 124 | |
| 125 | #define res_size(res) ((res)->end - (res)->start + 1) |
| 126 | |
| 127 | static int __devinit sh_keysc_probe(struct platform_device *pdev) |
| 128 | { |
| 129 | struct sh_keysc_priv *priv; |
| 130 | struct sh_keysc_info *pdata; |
| 131 | struct resource *res; |
| 132 | struct input_dev *input; |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 133 | char clk_name[8]; |
Dmitry Torokhov | 24d01c0 | 2009-07-21 01:12:12 -0700 | [diff] [blame] | 134 | int i; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 135 | int irq, error; |
| 136 | |
| 137 | if (!pdev->dev.platform_data) { |
| 138 | dev_err(&pdev->dev, "no platform data defined\n"); |
| 139 | error = -EINVAL; |
| 140 | goto err0; |
| 141 | } |
| 142 | |
| 143 | error = -ENXIO; |
| 144 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 145 | if (res == NULL) { |
| 146 | dev_err(&pdev->dev, "failed to get I/O memory\n"); |
| 147 | goto err0; |
| 148 | } |
| 149 | |
| 150 | irq = platform_get_irq(pdev, 0); |
| 151 | if (irq < 0) { |
| 152 | dev_err(&pdev->dev, "failed to get irq\n"); |
| 153 | goto err0; |
| 154 | } |
| 155 | |
| 156 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 157 | if (priv == NULL) { |
| 158 | dev_err(&pdev->dev, "failed to allocate driver data\n"); |
| 159 | error = -ENOMEM; |
| 160 | goto err0; |
| 161 | } |
| 162 | |
| 163 | platform_set_drvdata(pdev, priv); |
| 164 | memcpy(&priv->pdata, pdev->dev.platform_data, sizeof(priv->pdata)); |
| 165 | pdata = &priv->pdata; |
| 166 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 167 | priv->iomem_base = ioremap_nocache(res->start, res_size(res)); |
| 168 | if (priv->iomem_base == NULL) { |
| 169 | dev_err(&pdev->dev, "failed to remap I/O memory\n"); |
| 170 | error = -ENXIO; |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame] | 171 | goto err1; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 172 | } |
| 173 | |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 174 | snprintf(clk_name, sizeof(clk_name), "keysc%d", pdev->id); |
| 175 | priv->clk = clk_get(&pdev->dev, clk_name); |
| 176 | if (IS_ERR(priv->clk)) { |
| 177 | dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name); |
| 178 | error = PTR_ERR(priv->clk); |
| 179 | goto err2; |
| 180 | } |
| 181 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 182 | priv->input = input_allocate_device(); |
| 183 | if (!priv->input) { |
| 184 | dev_err(&pdev->dev, "failed to allocate input device\n"); |
| 185 | error = -ENOMEM; |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 186 | goto err3; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | input = priv->input; |
| 190 | input->evbit[0] = BIT_MASK(EV_KEY); |
| 191 | |
| 192 | input->name = pdev->name; |
| 193 | input->phys = "sh-keysc-keys/input0"; |
| 194 | input->dev.parent = &pdev->dev; |
| 195 | |
| 196 | input->id.bustype = BUS_HOST; |
| 197 | input->id.vendor = 0x0001; |
| 198 | input->id.product = 0x0001; |
| 199 | input->id.version = 0x0100; |
| 200 | |
Dmitry Torokhov | 24d01c0 | 2009-07-21 01:12:12 -0700 | [diff] [blame] | 201 | input->keycode = pdata->keycodes; |
| 202 | input->keycodesize = sizeof(pdata->keycodes[0]); |
| 203 | input->keycodemax = ARRAY_SIZE(pdata->keycodes); |
| 204 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 205 | error = request_irq(irq, sh_keysc_isr, 0, pdev->name, pdev); |
| 206 | if (error) { |
| 207 | dev_err(&pdev->dev, "failed to request IRQ\n"); |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 208 | goto err4; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 209 | } |
| 210 | |
Dmitry Torokhov | 24d01c0 | 2009-07-21 01:12:12 -0700 | [diff] [blame] | 211 | for (i = 0; i < SH_KEYSC_MAXKEYS; i++) |
| 212 | __set_bit(pdata->keycodes[i], input->keybit); |
| 213 | __clear_bit(KEY_RESERVED, input->keybit); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 214 | |
| 215 | error = input_register_device(input); |
| 216 | if (error) { |
| 217 | dev_err(&pdev->dev, "failed to register input device\n"); |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 218 | goto err5; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 219 | } |
| 220 | |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 221 | clk_enable(priv->clk); |
| 222 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 223 | iowrite16((sh_keysc_mode[pdata->mode].kymd << 8) | |
| 224 | pdata->scan_timing, priv->iomem_base + KYCR1_OFFS); |
| 225 | iowrite16(0, priv->iomem_base + KYOUTDR_OFFS); |
| 226 | iowrite16(KYCR2_IRQ_LEVEL, priv->iomem_base + KYCR2_OFFS); |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 227 | |
| 228 | device_init_wakeup(&pdev->dev, 1); |
Dmitry Torokhov | 24d01c0 | 2009-07-21 01:12:12 -0700 | [diff] [blame] | 229 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 230 | return 0; |
Dmitry Torokhov | 24d01c0 | 2009-07-21 01:12:12 -0700 | [diff] [blame] | 231 | |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 232 | err5: |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame] | 233 | free_irq(irq, pdev); |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 234 | err4: |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame] | 235 | input_free_device(input); |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 236 | err3: |
| 237 | clk_put(priv->clk); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 238 | err2: |
Tetsuya Mukawa | d3aa43a | 2008-07-19 07:46:53 +0900 | [diff] [blame] | 239 | iounmap(priv->iomem_base); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 240 | err1: |
| 241 | platform_set_drvdata(pdev, NULL); |
| 242 | kfree(priv); |
| 243 | err0: |
| 244 | return error; |
| 245 | } |
| 246 | |
| 247 | static int __devexit sh_keysc_remove(struct platform_device *pdev) |
| 248 | { |
| 249 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 250 | |
| 251 | iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS); |
| 252 | |
| 253 | input_unregister_device(priv->input); |
| 254 | free_irq(platform_get_irq(pdev, 0), pdev); |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 255 | iounmap(priv->iomem_base); |
| 256 | |
Magnus Damm | 090d951 | 2008-10-31 20:21:23 +0900 | [diff] [blame] | 257 | clk_disable(priv->clk); |
| 258 | clk_put(priv->clk); |
| 259 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 260 | platform_set_drvdata(pdev, NULL); |
| 261 | kfree(priv); |
Dmitry Torokhov | 24d01c0 | 2009-07-21 01:12:12 -0700 | [diff] [blame] | 262 | |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 263 | return 0; |
| 264 | } |
| 265 | |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 266 | static int sh_keysc_suspend(struct device *dev) |
| 267 | { |
Magnus Damm | 4997692 | 2009-03-11 08:04:23 +0000 | [diff] [blame] | 268 | struct platform_device *pdev = to_platform_device(dev); |
| 269 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); |
Magnus Damm | 4ba50df | 2009-04-01 14:39:20 +0000 | [diff] [blame] | 270 | int irq = platform_get_irq(pdev, 0); |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 271 | unsigned short value; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 272 | |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 273 | value = ioread16(priv->iomem_base + KYCR1_OFFS); |
| 274 | |
Magnus Damm | 4ba50df | 2009-04-01 14:39:20 +0000 | [diff] [blame] | 275 | if (device_may_wakeup(dev)) { |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 276 | value |= 0x80; |
Magnus Damm | 4ba50df | 2009-04-01 14:39:20 +0000 | [diff] [blame] | 277 | enable_irq_wake(irq); |
Dmitry Torokhov | 24d01c0 | 2009-07-21 01:12:12 -0700 | [diff] [blame] | 278 | } else { |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 279 | value &= ~0x80; |
Dmitry Torokhov | 24d01c0 | 2009-07-21 01:12:12 -0700 | [diff] [blame] | 280 | } |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 281 | |
| 282 | iowrite16(value, priv->iomem_base + KYCR1_OFFS); |
Dmitry Torokhov | 24d01c0 | 2009-07-21 01:12:12 -0700 | [diff] [blame] | 283 | |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 284 | return 0; |
| 285 | } |
| 286 | |
Magnus Damm | 4ba50df | 2009-04-01 14:39:20 +0000 | [diff] [blame] | 287 | static int sh_keysc_resume(struct device *dev) |
| 288 | { |
| 289 | struct platform_device *pdev = to_platform_device(dev); |
| 290 | int irq = platform_get_irq(pdev, 0); |
| 291 | |
| 292 | if (device_may_wakeup(dev)) |
| 293 | disable_irq_wake(irq); |
| 294 | |
| 295 | return 0; |
| 296 | } |
| 297 | |
Alexey Dobriyan | 4714521 | 2009-12-14 18:00:08 -0800 | [diff] [blame] | 298 | static const struct dev_pm_ops sh_keysc_dev_pm_ops = { |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 299 | .suspend = sh_keysc_suspend, |
Magnus Damm | 4ba50df | 2009-04-01 14:39:20 +0000 | [diff] [blame] | 300 | .resume = sh_keysc_resume, |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 301 | }; |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 302 | |
| 303 | struct platform_driver sh_keysc_device_driver = { |
| 304 | .probe = sh_keysc_probe, |
| 305 | .remove = __devexit_p(sh_keysc_remove), |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 306 | .driver = { |
| 307 | .name = "sh_keysc", |
Magnus Damm | a29b99e | 2009-03-10 06:24:21 +0000 | [diff] [blame] | 308 | .pm = &sh_keysc_dev_pm_ops, |
Magnus Damm | 795e6bf | 2008-03-04 15:23:45 -0800 | [diff] [blame] | 309 | } |
| 310 | }; |
| 311 | |
| 312 | static int __init sh_keysc_init(void) |
| 313 | { |
| 314 | return platform_driver_register(&sh_keysc_device_driver); |
| 315 | } |
| 316 | |
| 317 | static void __exit sh_keysc_exit(void) |
| 318 | { |
| 319 | platform_driver_unregister(&sh_keysc_device_driver); |
| 320 | } |
| 321 | |
| 322 | module_init(sh_keysc_init); |
| 323 | module_exit(sh_keysc_exit); |
| 324 | |
| 325 | MODULE_AUTHOR("Magnus Damm"); |
| 326 | MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver"); |
| 327 | MODULE_LICENSE("GPL"); |