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304 lines
7.3 KiB
304 lines
7.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for |
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* Wolfson WM97xx AC97 Codecs. |
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* |
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* Copyright 2004, 2007 Wolfson Microelectronics PLC. |
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* Author: Liam Girdwood <[email protected]> |
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* Parts Copyright : Ian Molton <[email protected]> |
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* Andrew Zabolotny <[email protected]> |
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* |
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* Notes: |
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* This is a wm97xx extended touch driver to capture touch |
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* data in a continuous manner on the Intel XScale architecture |
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* |
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* Features: |
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* - codecs supported:- WM9705, WM9712, WM9713 |
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* - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x |
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*/ |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/kernel.h> |
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#include <linux/delay.h> |
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#include <linux/irq.h> |
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#include <linux/interrupt.h> |
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#include <linux/wm97xx.h> |
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#include <linux/io.h> |
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#include <linux/gpio.h> |
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#include <mach/regs-ac97.h> |
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#include <asm/mach-types.h> |
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struct continuous { |
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u16 id; /* codec id */ |
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u8 code; /* continuous code */ |
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u8 reads; /* number of coord reads per read cycle */ |
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u32 speed; /* number of coords per second */ |
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}; |
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#define WM_READS(sp) ((sp / HZ) + 1) |
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static const struct continuous cinfo[] = { |
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{WM9705_ID2, 0, WM_READS(94), 94}, |
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{WM9705_ID2, 1, WM_READS(188), 188}, |
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{WM9705_ID2, 2, WM_READS(375), 375}, |
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{WM9705_ID2, 3, WM_READS(750), 750}, |
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{WM9712_ID2, 0, WM_READS(94), 94}, |
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{WM9712_ID2, 1, WM_READS(188), 188}, |
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{WM9712_ID2, 2, WM_READS(375), 375}, |
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{WM9712_ID2, 3, WM_READS(750), 750}, |
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{WM9713_ID2, 0, WM_READS(94), 94}, |
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{WM9713_ID2, 1, WM_READS(120), 120}, |
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{WM9713_ID2, 2, WM_READS(154), 154}, |
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{WM9713_ID2, 3, WM_READS(188), 188}, |
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}; |
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/* continuous speed index */ |
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static int sp_idx; |
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static u16 last, tries; |
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static int irq; |
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/* |
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* Pen sampling frequency (Hz) in continuous mode. |
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*/ |
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static int cont_rate = 200; |
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module_param(cont_rate, int, 0); |
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MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)"); |
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/* |
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* Pen down detection. |
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* |
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* This driver can either poll or use an interrupt to indicate a pen down |
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* event. If the irq request fails then it will fall back to polling mode. |
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*/ |
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static int pen_int; |
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module_param(pen_int, int, 0); |
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MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)"); |
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/* |
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* Pressure readback. |
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* |
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* Set to 1 to read back pen down pressure |
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*/ |
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static int pressure; |
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module_param(pressure, int, 0); |
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MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)"); |
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/* |
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* AC97 touch data slot. |
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* |
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* Touch screen readback data ac97 slot |
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*/ |
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static int ac97_touch_slot = 5; |
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module_param(ac97_touch_slot, int, 0); |
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MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number"); |
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/* flush AC97 slot 5 FIFO on pxa machines */ |
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#ifdef CONFIG_PXA27x |
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static void wm97xx_acc_pen_up(struct wm97xx *wm) |
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{ |
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schedule_timeout_uninterruptible(1); |
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while (MISR & (1 << 2)) |
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MODR; |
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} |
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#else |
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static void wm97xx_acc_pen_up(struct wm97xx *wm) |
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{ |
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unsigned int count; |
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schedule_timeout_uninterruptible(1); |
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for (count = 0; count < 16; count++) |
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MODR; |
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} |
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#endif |
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static int wm97xx_acc_pen_down(struct wm97xx *wm) |
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{ |
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u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES; |
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int reads = 0; |
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/* When the AC97 queue has been drained we need to allow time |
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* to buffer up samples otherwise we end up spinning polling |
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* for samples. The controller can't have a suitably low |
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* threshold set to use the notifications it gives. |
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*/ |
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schedule_timeout_uninterruptible(1); |
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if (tries > 5) { |
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tries = 0; |
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return RC_PENUP; |
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} |
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x = MODR; |
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if (x == last) { |
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tries++; |
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return RC_AGAIN; |
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} |
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last = x; |
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do { |
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if (reads) |
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x = MODR; |
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y = MODR; |
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if (pressure) |
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p = MODR; |
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dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n", |
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x, y, p); |
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/* are samples valid */ |
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if ((x & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_X || |
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(y & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_Y || |
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(p & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_PRES) |
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goto up; |
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/* coordinate is good */ |
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tries = 0; |
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input_report_abs(wm->input_dev, ABS_X, x & 0xfff); |
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input_report_abs(wm->input_dev, ABS_Y, y & 0xfff); |
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input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff); |
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input_report_key(wm->input_dev, BTN_TOUCH, (p != 0)); |
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input_sync(wm->input_dev); |
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reads++; |
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} while (reads < cinfo[sp_idx].reads); |
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up: |
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return RC_PENDOWN | RC_AGAIN; |
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} |
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static int wm97xx_acc_startup(struct wm97xx *wm) |
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{ |
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int idx = 0, ret = 0; |
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/* check we have a codec */ |
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if (wm->ac97 == NULL) |
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return -ENODEV; |
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/* Go you big red fire engine */ |
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for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) { |
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if (wm->id != cinfo[idx].id) |
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continue; |
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sp_idx = idx; |
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if (cont_rate <= cinfo[idx].speed) |
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break; |
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} |
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wm->acc_rate = cinfo[sp_idx].code; |
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wm->acc_slot = ac97_touch_slot; |
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dev_info(wm->dev, |
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"mainstone accelerated touchscreen driver, %d samples/sec\n", |
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cinfo[sp_idx].speed); |
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/* IRQ driven touchscreen is used on Palm hardware */ |
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if (machine_is_palmt5() || machine_is_palmtx() || machine_is_palmld()) { |
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pen_int = 1; |
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irq = 27; |
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/* There is some obscure mutant of WM9712 interbred with WM9713 |
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* used on Palm HW */ |
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wm->variant = WM97xx_WM1613; |
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} else if (machine_is_mainstone() && pen_int) |
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irq = 4; |
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if (irq) { |
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ret = gpio_request(irq, "Touchscreen IRQ"); |
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if (ret) |
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goto out; |
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ret = gpio_direction_input(irq); |
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if (ret) { |
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gpio_free(irq); |
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goto out; |
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} |
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wm->pen_irq = gpio_to_irq(irq); |
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irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH); |
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} else /* pen irq not supported */ |
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pen_int = 0; |
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/* codec specific irq config */ |
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if (pen_int) { |
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switch (wm->id) { |
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case WM9705_ID2: |
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break; |
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case WM9712_ID2: |
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case WM9713_ID2: |
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/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */ |
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wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN, |
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WM97XX_GPIO_POL_HIGH, |
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WM97XX_GPIO_STICKY, |
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WM97XX_GPIO_WAKE); |
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wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT, |
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WM97XX_GPIO_POL_HIGH, |
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WM97XX_GPIO_NOTSTICKY, |
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WM97XX_GPIO_NOWAKE); |
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break; |
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default: |
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dev_err(wm->dev, |
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"pen down irq not supported on this device\n"); |
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pen_int = 0; |
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break; |
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} |
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} |
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out: |
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return ret; |
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} |
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static void wm97xx_acc_shutdown(struct wm97xx *wm) |
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{ |
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/* codec specific deconfig */ |
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if (pen_int) { |
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if (irq) |
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gpio_free(irq); |
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wm->pen_irq = 0; |
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} |
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} |
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static void wm97xx_irq_enable(struct wm97xx *wm, int enable) |
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{ |
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if (enable) |
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enable_irq(wm->pen_irq); |
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else |
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disable_irq_nosync(wm->pen_irq); |
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} |
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static struct wm97xx_mach_ops mainstone_mach_ops = { |
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.acc_enabled = 1, |
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.acc_pen_up = wm97xx_acc_pen_up, |
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.acc_pen_down = wm97xx_acc_pen_down, |
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.acc_startup = wm97xx_acc_startup, |
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.acc_shutdown = wm97xx_acc_shutdown, |
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.irq_enable = wm97xx_irq_enable, |
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.irq_gpio = WM97XX_GPIO_2, |
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}; |
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static int mainstone_wm97xx_probe(struct platform_device *pdev) |
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{ |
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struct wm97xx *wm = platform_get_drvdata(pdev); |
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return wm97xx_register_mach_ops(wm, &mainstone_mach_ops); |
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} |
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static int mainstone_wm97xx_remove(struct platform_device *pdev) |
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{ |
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struct wm97xx *wm = platform_get_drvdata(pdev); |
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wm97xx_unregister_mach_ops(wm); |
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return 0; |
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} |
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static struct platform_driver mainstone_wm97xx_driver = { |
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.probe = mainstone_wm97xx_probe, |
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.remove = mainstone_wm97xx_remove, |
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.driver = { |
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.name = "wm97xx-touch", |
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}, |
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}; |
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module_platform_driver(mainstone_wm97xx_driver); |
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/* Module information */ |
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MODULE_AUTHOR("Liam Girdwood <[email protected]>"); |
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MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone"); |
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MODULE_LICENSE("GPL");
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