Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 1 | /* |
| 2 | * PXA930 track ball mouse driver |
| 3 | * |
| 4 | * Copyright (C) 2007 Marvell International Ltd. |
| 5 | * 2008-02-28: Yong Yao <yaoyong@marvell.com> |
| 6 | * initial version |
| 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/init.h> |
| 14 | #include <linux/input.h> |
Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | #include <linux/delay.h> |
| 19 | #include <linux/io.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 21 | |
| 22 | #include <mach/hardware.h> |
Arnd Bergmann | 293b2da | 2012-08-24 15:16:48 +0200 | [diff] [blame] | 23 | #include <linux/platform_data/mouse-pxa930_trkball.h> |
Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 24 | |
| 25 | /* Trackball Controller Register Definitions */ |
| 26 | #define TBCR (0x000C) |
| 27 | #define TBCNTR (0x0010) |
| 28 | #define TBSBC (0x0014) |
| 29 | |
| 30 | #define TBCR_TBRST (1 << 1) |
| 31 | #define TBCR_TBSB (1 << 10) |
| 32 | |
| 33 | #define TBCR_Y_FLT(n) (((n) & 0xf) << 6) |
| 34 | #define TBCR_X_FLT(n) (((n) & 0xf) << 2) |
| 35 | |
| 36 | #define TBCNTR_YM(n) (((n) >> 24) & 0xff) |
| 37 | #define TBCNTR_YP(n) (((n) >> 16) & 0xff) |
| 38 | #define TBCNTR_XM(n) (((n) >> 8) & 0xff) |
| 39 | #define TBCNTR_XP(n) ((n) & 0xff) |
| 40 | |
| 41 | #define TBSBC_TBSBC (0x1) |
| 42 | |
| 43 | struct pxa930_trkball { |
| 44 | struct pxa930_trkball_platform_data *pdata; |
| 45 | |
| 46 | /* Memory Mapped Register */ |
| 47 | struct resource *mem; |
| 48 | void __iomem *mmio_base; |
| 49 | |
| 50 | struct input_dev *input; |
| 51 | }; |
| 52 | |
| 53 | static irqreturn_t pxa930_trkball_interrupt(int irq, void *dev_id) |
| 54 | { |
| 55 | struct pxa930_trkball *trkball = dev_id; |
| 56 | struct input_dev *input = trkball->input; |
| 57 | int tbcntr, x, y; |
| 58 | |
| 59 | /* According to the spec software must read TBCNTR twice: |
| 60 | * if the read value is the same, the reading is valid |
| 61 | */ |
| 62 | tbcntr = __raw_readl(trkball->mmio_base + TBCNTR); |
| 63 | |
| 64 | if (tbcntr == __raw_readl(trkball->mmio_base + TBCNTR)) { |
| 65 | x = (TBCNTR_XP(tbcntr) - TBCNTR_XM(tbcntr)) / 2; |
| 66 | y = (TBCNTR_YP(tbcntr) - TBCNTR_YM(tbcntr)) / 2; |
| 67 | |
| 68 | input_report_rel(input, REL_X, x); |
| 69 | input_report_rel(input, REL_Y, y); |
| 70 | input_sync(input); |
| 71 | } |
| 72 | |
| 73 | __raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC); |
| 74 | __raw_writel(0, trkball->mmio_base + TBSBC); |
| 75 | |
| 76 | return IRQ_HANDLED; |
| 77 | } |
| 78 | |
| 79 | /* For TBCR, we need to wait for a while to make sure it has been modified. */ |
| 80 | static int write_tbcr(struct pxa930_trkball *trkball, int v) |
| 81 | { |
| 82 | int i = 100; |
| 83 | |
| 84 | __raw_writel(v, trkball->mmio_base + TBCR); |
| 85 | |
Roel Kluin | bc34496 | 2009-02-01 16:54:19 -0800 | [diff] [blame] | 86 | while (--i) { |
Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 87 | if (__raw_readl(trkball->mmio_base + TBCR) == v) |
| 88 | break; |
| 89 | msleep(1); |
| 90 | } |
| 91 | |
| 92 | if (i == 0) { |
| 93 | pr_err("%s: timed out writing TBCR(%x)!\n", __func__, v); |
| 94 | return -ETIMEDOUT; |
| 95 | } |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static void pxa930_trkball_config(struct pxa930_trkball *trkball) |
| 101 | { |
| 102 | uint32_t tbcr; |
| 103 | |
| 104 | /* According to spec, need to write the filters of x,y to 0xf first! */ |
| 105 | tbcr = __raw_readl(trkball->mmio_base + TBCR); |
| 106 | write_tbcr(trkball, tbcr | TBCR_X_FLT(0xf) | TBCR_Y_FLT(0xf)); |
| 107 | write_tbcr(trkball, TBCR_X_FLT(trkball->pdata->x_filter) | |
| 108 | TBCR_Y_FLT(trkball->pdata->y_filter)); |
| 109 | |
| 110 | /* According to spec, set TBCR_TBRST first, before clearing it! */ |
| 111 | tbcr = __raw_readl(trkball->mmio_base + TBCR); |
| 112 | write_tbcr(trkball, tbcr | TBCR_TBRST); |
| 113 | write_tbcr(trkball, tbcr & ~TBCR_TBRST); |
| 114 | |
| 115 | __raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC); |
| 116 | __raw_writel(0, trkball->mmio_base + TBSBC); |
| 117 | |
| 118 | pr_debug("%s: final TBCR=%x!\n", __func__, |
| 119 | __raw_readl(trkball->mmio_base + TBCR)); |
| 120 | } |
| 121 | |
| 122 | static int pxa930_trkball_open(struct input_dev *dev) |
| 123 | { |
| 124 | struct pxa930_trkball *trkball = input_get_drvdata(dev); |
| 125 | |
| 126 | pxa930_trkball_config(trkball); |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static void pxa930_trkball_disable(struct pxa930_trkball *trkball) |
| 132 | { |
| 133 | uint32_t tbcr = __raw_readl(trkball->mmio_base + TBCR); |
| 134 | |
| 135 | /* Held in reset, gate the 32-KHz input clock off */ |
| 136 | write_tbcr(trkball, tbcr | TBCR_TBRST); |
| 137 | } |
| 138 | |
| 139 | static void pxa930_trkball_close(struct input_dev *dev) |
| 140 | { |
| 141 | struct pxa930_trkball *trkball = input_get_drvdata(dev); |
| 142 | |
| 143 | pxa930_trkball_disable(trkball); |
| 144 | } |
| 145 | |
| 146 | static int __devinit pxa930_trkball_probe(struct platform_device *pdev) |
| 147 | { |
| 148 | struct pxa930_trkball *trkball; |
| 149 | struct input_dev *input; |
| 150 | struct resource *res; |
| 151 | int irq, error; |
| 152 | |
| 153 | irq = platform_get_irq(pdev, 0); |
| 154 | if (irq < 0) { |
| 155 | dev_err(&pdev->dev, "failed to get trkball irq\n"); |
| 156 | return -ENXIO; |
| 157 | } |
| 158 | |
| 159 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 160 | if (!res) { |
| 161 | dev_err(&pdev->dev, "failed to get register memory\n"); |
| 162 | return -ENXIO; |
| 163 | } |
| 164 | |
| 165 | trkball = kzalloc(sizeof(struct pxa930_trkball), GFP_KERNEL); |
| 166 | if (!trkball) |
| 167 | return -ENOMEM; |
| 168 | |
| 169 | trkball->pdata = pdev->dev.platform_data; |
| 170 | if (!trkball->pdata) { |
| 171 | dev_err(&pdev->dev, "no platform data defined\n"); |
| 172 | error = -EINVAL; |
| 173 | goto failed; |
| 174 | } |
| 175 | |
| 176 | trkball->mmio_base = ioremap_nocache(res->start, resource_size(res)); |
| 177 | if (!trkball->mmio_base) { |
| 178 | dev_err(&pdev->dev, "failed to ioremap registers\n"); |
| 179 | error = -ENXIO; |
| 180 | goto failed; |
| 181 | } |
| 182 | |
| 183 | /* held the module in reset, will be enabled in open() */ |
| 184 | pxa930_trkball_disable(trkball); |
| 185 | |
Yong Zhang | ec4665c | 2011-09-07 14:04:16 -0700 | [diff] [blame] | 186 | error = request_irq(irq, pxa930_trkball_interrupt, 0, |
Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 187 | pdev->name, trkball); |
| 188 | if (error) { |
Russell King | d8f2f18 | 2009-01-08 12:27:00 +0000 | [diff] [blame] | 189 | dev_err(&pdev->dev, "failed to request irq: %d\n", error); |
Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 190 | goto failed_free_io; |
| 191 | } |
| 192 | |
| 193 | platform_set_drvdata(pdev, trkball); |
| 194 | |
| 195 | input = input_allocate_device(); |
| 196 | if (!input) { |
| 197 | dev_err(&pdev->dev, "failed to allocate input device\n"); |
| 198 | error = -ENOMEM; |
| 199 | goto failed_free_irq; |
| 200 | } |
| 201 | |
| 202 | input->name = pdev->name; |
| 203 | input->id.bustype = BUS_HOST; |
| 204 | input->open = pxa930_trkball_open; |
| 205 | input->close = pxa930_trkball_close; |
| 206 | input->dev.parent = &pdev->dev; |
| 207 | input_set_drvdata(input, trkball); |
| 208 | |
| 209 | trkball->input = input; |
| 210 | |
| 211 | input_set_capability(input, EV_REL, REL_X); |
| 212 | input_set_capability(input, EV_REL, REL_Y); |
| 213 | |
| 214 | error = input_register_device(input); |
| 215 | if (error) { |
| 216 | dev_err(&pdev->dev, "unable to register input device\n"); |
| 217 | goto failed_free_input; |
| 218 | } |
| 219 | |
| 220 | return 0; |
| 221 | |
| 222 | failed_free_input: |
| 223 | input_free_device(input); |
| 224 | failed_free_irq: |
| 225 | free_irq(irq, trkball); |
| 226 | failed_free_io: |
| 227 | iounmap(trkball->mmio_base); |
| 228 | failed: |
| 229 | kfree(trkball); |
Russell King | d8f2f18 | 2009-01-08 12:27:00 +0000 | [diff] [blame] | 230 | return error; |
Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | static int __devexit pxa930_trkball_remove(struct platform_device *pdev) |
| 234 | { |
| 235 | struct pxa930_trkball *trkball = platform_get_drvdata(pdev); |
| 236 | int irq = platform_get_irq(pdev, 0); |
| 237 | |
| 238 | input_unregister_device(trkball->input); |
| 239 | free_irq(irq, trkball); |
| 240 | iounmap(trkball->mmio_base); |
| 241 | kfree(trkball); |
| 242 | |
| 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | static struct platform_driver pxa930_trkball_driver = { |
| 247 | .driver = { |
| 248 | .name = "pxa930-trkball", |
| 249 | }, |
| 250 | .probe = pxa930_trkball_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame^] | 251 | .remove = pxa930_trkball_remove, |
Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 252 | }; |
JJ Ding | 4fcdeac | 2011-11-29 11:08:41 -0800 | [diff] [blame] | 253 | module_platform_driver(pxa930_trkball_driver); |
Yong Yao | 105ca23 | 2008-12-29 03:59:59 -0800 | [diff] [blame] | 254 | |
| 255 | MODULE_AUTHOR("Yong Yao <yaoyong@marvell.com>"); |
| 256 | MODULE_DESCRIPTION("PXA930 Trackball Mouse Driver"); |
| 257 | MODULE_LICENSE("GPL"); |