| | 1 | /* |
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| | 2 | * linux/drivers/input/keyboard/pxa27x_keyboard.c |
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| | 3 | * |
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| | 4 | * Driver for the pxa27x matrix keyboard controller. |
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| | 5 | * |
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| | 6 | * Created: Feb 22, 2007 |
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| | 7 | * Author: Rodolfo Giometti <giometti@linux.it> |
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| | 8 | * |
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| | 9 | * Based on a previous implementations by Kevin O'Connor |
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| | 10 | * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and |
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| | 11 | * on some suggestions by Nicolas Pitre <nico@cam.org>. |
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| | 12 | * |
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| | 13 | * This program is free software; you can redistribute it and/or modify |
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| | 14 | * it under the terms of the GNU General Public License version 2 as |
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| | 15 | * published by the Free Software Foundation. |
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| | 16 | */ |
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| | 17 | |
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| | 18 | |
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| | 19 | #include <linux/kernel.h> |
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| | 20 | #include <linux/module.h> |
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| | 21 | #include <linux/init.h> |
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| | 22 | #include <linux/interrupt.h> |
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| | 23 | #include <linux/input.h> |
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| | 24 | #include <linux/device.h> |
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| | 25 | #include <linux/platform_device.h> |
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| | 26 | #include <linux/clk.h> |
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| | 27 | #include <linux/err.h> |
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| | 28 | |
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| | 29 | #include <asm/mach-types.h> |
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| | 30 | #include <asm/mach/arch.h> |
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| | 31 | #include <asm/mach/map.h> |
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| | 32 | |
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| | 33 | #include <asm/arch/hardware.h> |
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| | 34 | #include <asm/arch/pxa-regs.h> |
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| | 35 | #include <asm/arch/irqs.h> |
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| | 36 | #include <asm/arch/pxa27x_keyboard.h> |
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| | 37 | |
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| | 38 | #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
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| | 39 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
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| | 40 | #define BITS_PER_BYTE 8 |
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| | 41 | |
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| | 42 | #define DRIVER_NAME "pxa27x-keyboard" |
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| | 43 | |
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| | 44 | #define KPASMKP(col) (col/2 == 0 ? KPASMKP0 : \ |
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| | 45 | col/2 == 1 ? KPASMKP1 : \ |
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| | 46 | col/2 == 2 ? KPASMKP2 : KPASMKP3) |
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| | 47 | #define KPASMKPx_MKC(row, col) (1 << (row + 16 * (col % 2))) |
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| | 48 | |
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| | 49 | static struct clk *pxakbd_clk; |
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| | 50 | |
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| | 51 | static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id) |
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| | 52 | { |
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| | 53 | struct platform_device *pdev = dev_id; |
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| | 54 | struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data; |
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| | 55 | struct input_dev *input_dev = platform_get_drvdata(pdev); |
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| | 56 | unsigned long kpc = KPC; |
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| | 57 | int p, row, col, rel; |
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| | 58 | |
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| | 59 | if (kpc & KPC_DI) { |
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| | 60 | unsigned long kpdk = KPDK; |
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| | 61 | |
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| | 62 | if (!(kpdk & KPDK_DKP)) { |
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| | 63 | /* better luck next time */ |
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| | 64 | } else if (kpc & KPC_REE0) { |
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| | 65 | unsigned long kprec = KPREC; |
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| | 66 | KPREC = 0x7f; |
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| | 67 | |
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| | 68 | if (kprec & KPREC_OF0) |
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| | 69 | rel = (kprec & 0xff) + 0x7f; |
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| | 70 | else if (kprec & KPREC_UF0) |
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| | 71 | rel = (kprec & 0xff) - 0x7f - 0xff; |
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| | 72 | else |
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| | 73 | rel = (kprec & 0xff) - 0x7f; |
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| | 74 | |
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| | 75 | if (rel) { |
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| | 76 | input_report_rel(input_dev, REL_WHEEL, rel); |
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| | 77 | input_sync(input_dev); |
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| | 78 | } |
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| | 79 | } |
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| | 80 | } |
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| | 81 | |
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| | 82 | if (kpc & KPC_MI) { |
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| | 83 | /* report the status of every button */ |
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| | 84 | for (row = 0; row < pdata->nr_rows; row++) { |
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| | 85 | for (col = 0; col < pdata->nr_cols; col++) { |
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| | 86 | p = KPASMKP(col) & KPASMKPx_MKC(row, col) ? |
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| | 87 | 1 : 0; |
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| | 88 | //printk(KERN_INFO "keycode %x - pressed %x\n", pdata->keycodes[row][col],p); |
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| | 89 | input_report_key(input_dev, |
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| | 90 | pdata->keycodes[row][col], p); |
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| | 91 | } |
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| | 92 | } |
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| | 93 | input_sync(input_dev); |
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| | 94 | } |
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| | 95 | |
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| | 96 | return IRQ_HANDLED; |
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| | 97 | } |
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| | 98 | |
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| | 99 | static int pxakbd_open(struct input_dev *dev) |
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| | 100 | { |
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| | 101 | /* Set keypad control register */ |
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| | 102 | KPC |= (KPC_ASACT | |
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| | 103 | KPC_MS_ALL | |
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| | 104 | (2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL | |
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| | 105 | KPC_ME | KPC_MIE | KPC_DE | KPC_DIE); |
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| | 106 | |
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| | 107 | KPC &= ~KPC_AS; /* disable automatic scan */ |
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| | 108 | KPC &= ~KPC_IMKP; /* do not ignore multiple keypresses */ |
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| | 109 | |
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| | 110 | /* Set rotary count to mid-point value */ |
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| | 111 | KPREC = 0x7F; |
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| | 112 | |
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| | 113 | /* Enable unit clock */ |
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| | 114 | clk_enable(pxakbd_clk); |
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| | 115 | |
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| | 116 | return 0; |
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| | 117 | } |
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| | 118 | |
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| | 119 | static void pxakbd_close(struct input_dev *dev) |
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| | 120 | { |
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| | 121 | /* Disable clock unit */ |
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| | 122 | clk_disable(pxakbd_clk); |
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| | 123 | } |
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| | 124 | |
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| | 125 | #ifdef CONFIG_PM |
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| | 126 | static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state) |
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| | 127 | { |
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| | 128 | struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data; |
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| | 129 | |
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| | 130 | /* Save controller status */ |
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| | 131 | pdata->reg_kpc = KPC; |
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| | 132 | pdata->reg_kprec = KPREC; |
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| | 133 | |
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| | 134 | return 0; |
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| | 135 | } |
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| | 136 | |
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| | 137 | static int pxakbd_resume(struct platform_device *pdev) |
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| | 138 | { |
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| | 139 | struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data; |
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| | 140 | struct input_dev *input_dev = platform_get_drvdata(pdev); |
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| | 141 | |
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| | 142 | mutex_lock(&input_dev->mutex); |
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| | 143 | |
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| | 144 | if (input_dev->users) { |
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| | 145 | /* Restore controller status */ |
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| | 146 | KPC = pdata->reg_kpc; |
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| | 147 | KPREC = pdata->reg_kprec; |
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| | 148 | |
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| | 149 | /* Enable unit clock */ |
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| | 150 | clk_disable(pxakbd_clk); |
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| | 151 | clk_enable(pxakbd_clk); |
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| | 152 | } |
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| | 153 | |
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| | 154 | mutex_unlock(&input_dev->mutex); |
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| | 155 | |
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| | 156 | return 0; |
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| | 157 | } |
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| | 158 | #else |
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| | 159 | #define pxakbd_suspend NULL |
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| | 160 | #define pxakbd_resume NULL |
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| | 161 | #endif |
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| | 162 | |
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| | 163 | static int __devinit pxakbd_probe(struct platform_device *pdev) |
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| | 164 | { |
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| | 165 | struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data; |
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| | 166 | struct input_dev *input_dev; |
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| | 167 | int i, row, col, error; |
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| | 168 | |
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| | 169 | pxakbd_clk = clk_get(&pdev->dev, "KBDCLK"); |
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| | 170 | if (IS_ERR(pxakbd_clk)) { |
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| | 171 | error = PTR_ERR(pxakbd_clk); |
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| | 172 | goto err_clk; |
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| | 173 | } |
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| | 174 | |
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| | 175 | /* Create and register the input driver. */ |
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| | 176 | input_dev = input_allocate_device(); |
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| | 177 | if (!input_dev) { |
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| | 178 | printk(KERN_ERR "Cannot request keypad device\n"); |
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| | 179 | error = -ENOMEM; |
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| | 180 | goto err_alloc; |
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| | 181 | } |
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| | 182 | |
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| | 183 | input_dev->name = DRIVER_NAME; |
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| | 184 | input_dev->id.bustype = BUS_HOST; |
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| | 185 | input_dev->open = pxakbd_open; |
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| | 186 | input_dev->close = pxakbd_close; |
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| | 187 | // input_dev->dev.parent = &pdev->dev; |
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| | 188 | |
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| | 189 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | |
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| | 190 | BIT_MASK(EV_REL); |
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| | 191 | input_dev->relbit[BIT_WORD(REL_WHEEL)] = BIT_MASK(REL_WHEEL); |
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| | 192 | for (row = 0; row < pdata->nr_rows; row++) { |
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| | 193 | for (col = 0; col < pdata->nr_cols; col++) { |
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| | 194 | int code = pdata->keycodes[row][col]; |
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| | 195 | if (code > 0) |
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| | 196 | set_bit(code, input_dev->keybit); |
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| | 197 | } |
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| | 198 | } |
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| | 199 | |
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| | 200 | error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, IRQF_DISABLED, |
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| | 201 | DRIVER_NAME, pdev); |
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| | 202 | if (error) { |
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| | 203 | printk(KERN_ERR "Cannot request keypad IRQ\n"); |
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| | 204 | goto err_free_dev; |
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| | 205 | } |
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| | 206 | |
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| | 207 | platform_set_drvdata(pdev, input_dev); |
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| | 208 | |
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| | 209 | /* Register the input device */ |
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| | 210 | error = input_register_device(input_dev); |
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| | 211 | if (error) |
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| | 212 | goto err_free_irq; |
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| | 213 | |
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| | 214 | /* Setup GPIOs. */ |
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| | 215 | for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++) |
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| | 216 | pxa_gpio_mode(pdata->gpio_modes[i]); |
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| | 217 | |
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| | 218 | /* |
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| | 219 | * Store rows/cols info into keyboard registers. |
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| | 220 | */ |
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| | 221 | |
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| | 222 | KPC |= (pdata->nr_rows - 1) << 26; |
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| | 223 | KPC |= (pdata->nr_cols - 1) << 23; |
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| | 224 | |
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| | 225 | for (col = 0; col < pdata->nr_cols; col++) |
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| | 226 | KPC |= KPC_MS0 << col; |
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| | 227 | |
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| | 228 | return 0; |
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| | 229 | |
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| | 230 | err_free_irq: |
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| | 231 | platform_set_drvdata(pdev, NULL); |
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| | 232 | free_irq(IRQ_KEYPAD, pdev); |
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| | 233 | err_free_dev: |
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| | 234 | input_free_device(input_dev); |
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| | 235 | err_alloc: |
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| | 236 | clk_put(pxakbd_clk); |
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| | 237 | err_clk: |
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| | 238 | return error; |
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| | 239 | } |
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| | 240 | |
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| | 241 | static int __devexit pxakbd_remove(struct platform_device *pdev) |
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| | 242 | { |
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| | 243 | struct input_dev *input_dev = platform_get_drvdata(pdev); |
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| | 244 | |
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| | 245 | input_unregister_device(input_dev); |
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| | 246 | free_irq(IRQ_KEYPAD, pdev); |
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| | 247 | clk_put(pxakbd_clk); |
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| | 248 | platform_set_drvdata(pdev, NULL); |
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| | 249 | |
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| | 250 | return 0; |
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| | 251 | } |
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| | 252 | |
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| | 253 | static struct platform_driver pxakbd_driver = { |
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| | 254 | .probe = pxakbd_probe, |
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| | 255 | .remove = __devexit_p(pxakbd_remove), |
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| | 256 | .suspend = pxakbd_suspend, |
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| | 257 | .resume = pxakbd_resume, |
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| | 258 | .driver = { |
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| | 259 | .name = DRIVER_NAME, |
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| | 260 | }, |
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| | 261 | }; |
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| | 262 | |
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| | 263 | static int __init pxakbd_init(void) |
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| | 264 | { |
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| | 265 | return platform_driver_register(&pxakbd_driver); |
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| | 266 | } |
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| | 267 | |
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| | 268 | static void __exit pxakbd_exit(void) |
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| | 269 | { |
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| | 270 | platform_driver_unregister(&pxakbd_driver); |
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| | 271 | } |
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| | 272 | |
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| | 273 | module_init(pxakbd_init); |
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| | 274 | module_exit(pxakbd_exit); |
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| | 275 | |
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| | 276 | MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver"); |
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| | 277 | MODULE_LICENSE("GPL"); |