Mark Brown | 22e39d3 | 2009-03-04 01:12:49 -0800 | [diff] [blame] | 1 | /* |
| 2 | * zylonite-wm97xx.c -- Zylonite Continuous Touch screen driver |
| 3 | * |
| 4 | * Copyright 2004, 2007, 2008 Wolfson Microelectronics PLC. |
| 5 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| 6 | * Parts Copyright : Ian Molton <spyro@f2s.com> |
| 7 | * Andrew Zabolotny <zap@homelink.ru> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License as published by the |
| 11 | * Free Software Foundation; either version 2 of the License, or (at your |
| 12 | * option) any later version. |
| 13 | * |
| 14 | * Notes: |
| 15 | * This is a wm97xx extended touch driver supporting interrupt driven |
| 16 | * and continuous operation on Marvell Zylonite development systems |
| 17 | * (which have a WM9713 on board). |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/moduleparam.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/irq.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/io.h> |
| 28 | #include <linux/wm97xx.h> |
| 29 | |
| 30 | #include <mach/hardware.h> |
| 31 | #include <mach/mfp.h> |
| 32 | #include <mach/regs-ac97.h> |
| 33 | |
| 34 | struct continuous { |
| 35 | u16 id; /* codec id */ |
| 36 | u8 code; /* continuous code */ |
| 37 | u8 reads; /* number of coord reads per read cycle */ |
| 38 | u32 speed; /* number of coords per second */ |
| 39 | }; |
| 40 | |
| 41 | #define WM_READS(sp) ((sp / HZ) + 1) |
| 42 | |
| 43 | static const struct continuous cinfo[] = { |
| 44 | { WM9713_ID2, 0, WM_READS(94), 94 }, |
| 45 | { WM9713_ID2, 1, WM_READS(120), 120 }, |
| 46 | { WM9713_ID2, 2, WM_READS(154), 154 }, |
| 47 | { WM9713_ID2, 3, WM_READS(188), 188 }, |
| 48 | }; |
| 49 | |
| 50 | /* continuous speed index */ |
| 51 | static int sp_idx; |
| 52 | |
| 53 | /* |
| 54 | * Pen sampling frequency (Hz) in continuous mode. |
| 55 | */ |
| 56 | static int cont_rate = 200; |
| 57 | module_param(cont_rate, int, 0); |
| 58 | MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)"); |
| 59 | |
| 60 | /* |
| 61 | * Pressure readback. |
| 62 | * |
| 63 | * Set to 1 to read back pen down pressure |
| 64 | */ |
| 65 | static int pressure; |
| 66 | module_param(pressure, int, 0); |
| 67 | MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)"); |
| 68 | |
| 69 | /* |
| 70 | * AC97 touch data slot. |
| 71 | * |
| 72 | * Touch screen readback data ac97 slot |
| 73 | */ |
| 74 | static int ac97_touch_slot = 5; |
| 75 | module_param(ac97_touch_slot, int, 0); |
| 76 | MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number"); |
| 77 | |
| 78 | |
| 79 | /* flush AC97 slot 5 FIFO machines */ |
| 80 | static void wm97xx_acc_pen_up(struct wm97xx *wm) |
| 81 | { |
| 82 | int i; |
| 83 | |
| 84 | msleep(1); |
| 85 | |
| 86 | for (i = 0; i < 16; i++) |
| 87 | MODR; |
| 88 | } |
| 89 | |
| 90 | static int wm97xx_acc_pen_down(struct wm97xx *wm) |
| 91 | { |
| 92 | u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES; |
| 93 | int reads = 0; |
| 94 | static u16 last, tries; |
| 95 | |
| 96 | /* When the AC97 queue has been drained we need to allow time |
| 97 | * to buffer up samples otherwise we end up spinning polling |
| 98 | * for samples. The controller can't have a suitably low |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 99 | * threshold set to use the notifications it gives. |
Mark Brown | 22e39d3 | 2009-03-04 01:12:49 -0800 | [diff] [blame] | 100 | */ |
| 101 | msleep(1); |
| 102 | |
| 103 | if (tries > 5) { |
| 104 | tries = 0; |
| 105 | return RC_PENUP; |
| 106 | } |
| 107 | |
| 108 | x = MODR; |
| 109 | if (x == last) { |
| 110 | tries++; |
| 111 | return RC_AGAIN; |
| 112 | } |
| 113 | last = x; |
| 114 | do { |
| 115 | if (reads) |
| 116 | x = MODR; |
| 117 | y = MODR; |
| 118 | if (pressure) |
| 119 | p = MODR; |
| 120 | |
Mark Brown | dcfc32b | 2010-01-28 22:37:39 -0800 | [diff] [blame] | 121 | dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n", |
| 122 | x, y, p); |
| 123 | |
Mark Brown | 22e39d3 | 2009-03-04 01:12:49 -0800 | [diff] [blame] | 124 | /* are samples valid */ |
| 125 | if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X || |
| 126 | (y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y || |
| 127 | (p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES) |
| 128 | goto up; |
| 129 | |
| 130 | /* coordinate is good */ |
| 131 | tries = 0; |
| 132 | input_report_abs(wm->input_dev, ABS_X, x & 0xfff); |
| 133 | input_report_abs(wm->input_dev, ABS_Y, y & 0xfff); |
| 134 | input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff); |
| 135 | input_report_key(wm->input_dev, BTN_TOUCH, (p != 0)); |
| 136 | input_sync(wm->input_dev); |
| 137 | reads++; |
| 138 | } while (reads < cinfo[sp_idx].reads); |
| 139 | up: |
| 140 | return RC_PENDOWN | RC_AGAIN; |
| 141 | } |
| 142 | |
| 143 | static int wm97xx_acc_startup(struct wm97xx *wm) |
| 144 | { |
| 145 | int idx; |
| 146 | |
| 147 | /* check we have a codec */ |
| 148 | if (wm->ac97 == NULL) |
| 149 | return -ENODEV; |
| 150 | |
| 151 | /* Go you big red fire engine */ |
| 152 | for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { |
| 153 | if (wm->id != cinfo[idx].id) |
| 154 | continue; |
| 155 | sp_idx = idx; |
| 156 | if (cont_rate <= cinfo[idx].speed) |
| 157 | break; |
| 158 | } |
| 159 | wm->acc_rate = cinfo[sp_idx].code; |
| 160 | wm->acc_slot = ac97_touch_slot; |
| 161 | dev_info(wm->dev, |
| 162 | "zylonite accelerated touchscreen driver, %d samples/sec\n", |
| 163 | cinfo[sp_idx].speed); |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | static void wm97xx_irq_enable(struct wm97xx *wm, int enable) |
| 169 | { |
| 170 | if (enable) |
| 171 | enable_irq(wm->pen_irq); |
| 172 | else |
| 173 | disable_irq_nosync(wm->pen_irq); |
| 174 | } |
| 175 | |
| 176 | static struct wm97xx_mach_ops zylonite_mach_ops = { |
| 177 | .acc_enabled = 1, |
| 178 | .acc_pen_up = wm97xx_acc_pen_up, |
| 179 | .acc_pen_down = wm97xx_acc_pen_down, |
| 180 | .acc_startup = wm97xx_acc_startup, |
| 181 | .irq_enable = wm97xx_irq_enable, |
| 182 | .irq_gpio = WM97XX_GPIO_2, |
| 183 | }; |
| 184 | |
| 185 | static int zylonite_wm97xx_probe(struct platform_device *pdev) |
| 186 | { |
| 187 | struct wm97xx *wm = platform_get_drvdata(pdev); |
| 188 | int gpio_touch_irq; |
| 189 | |
| 190 | if (cpu_is_pxa320()) |
| 191 | gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO15); |
| 192 | else |
| 193 | gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO26); |
| 194 | |
| 195 | wm->pen_irq = IRQ_GPIO(gpio_touch_irq); |
Thomas Gleixner | dced35a | 2011-03-28 17:49:12 +0200 | [diff] [blame] | 196 | irq_set_irq_type(IRQ_GPIO(gpio_touch_irq), IRQ_TYPE_EDGE_BOTH); |
Mark Brown | 22e39d3 | 2009-03-04 01:12:49 -0800 | [diff] [blame] | 197 | |
| 198 | wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, |
| 199 | WM97XX_GPIO_POL_HIGH, |
| 200 | WM97XX_GPIO_STICKY, |
| 201 | WM97XX_GPIO_WAKE); |
| 202 | wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT, |
| 203 | WM97XX_GPIO_POL_HIGH, |
| 204 | WM97XX_GPIO_NOTSTICKY, |
| 205 | WM97XX_GPIO_NOWAKE); |
| 206 | |
| 207 | return wm97xx_register_mach_ops(wm, &zylonite_mach_ops); |
| 208 | } |
| 209 | |
| 210 | static int zylonite_wm97xx_remove(struct platform_device *pdev) |
| 211 | { |
| 212 | struct wm97xx *wm = platform_get_drvdata(pdev); |
| 213 | |
| 214 | wm97xx_unregister_mach_ops(wm); |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | static struct platform_driver zylonite_wm97xx_driver = { |
| 220 | .probe = zylonite_wm97xx_probe, |
| 221 | .remove = zylonite_wm97xx_remove, |
| 222 | .driver = { |
| 223 | .name = "wm97xx-touch", |
| 224 | }, |
| 225 | }; |
| 226 | |
| 227 | static int __init zylonite_wm97xx_init(void) |
| 228 | { |
| 229 | return platform_driver_register(&zylonite_wm97xx_driver); |
| 230 | } |
| 231 | |
| 232 | static void __exit zylonite_wm97xx_exit(void) |
| 233 | { |
| 234 | platform_driver_unregister(&zylonite_wm97xx_driver); |
| 235 | } |
| 236 | |
| 237 | module_init(zylonite_wm97xx_init); |
| 238 | module_exit(zylonite_wm97xx_exit); |
| 239 | |
| 240 | /* Module information */ |
| 241 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| 242 | MODULE_DESCRIPTION("wm97xx continuous touch driver for Zylonite"); |
| 243 | MODULE_LICENSE("GPL"); |