8  * Keypad controller driver for the SKE (Scroll Key Encoder) module used in
22 #include <linux/platform_data/keypad-nomadik-ske.h>
44 /* keypad auto scan registers */
54  * struct ske_keypad  - data structure used by keypad driver
58  * @board:	keypad platform device
62  * @ske_keypad_lock: spinlock protecting the keypad read/writes
75 static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,  in ske_keypad_set_bits()  argument
80 	spin_lock(&keypad->ske_keypad_lock);  in ske_keypad_set_bits()
82 	ret = readl(keypad->reg_base + addr);  in ske_keypad_set_bits()
85 	writel(ret, keypad->reg_base + addr);  in ske_keypad_set_bits()
87 	spin_unlock(&keypad->ske_keypad_lock);  in ske_keypad_set_bits()
91  * ske_keypad_chip_init: init keypad controller configuration
95 static int __init ske_keypad_chip_init(struct ske_keypad *keypad)  in ske_keypad_chip_init()  argument
98 	int timeout = keypad->board->debounce_ms;  in ske_keypad_chip_init()
101 	while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)  in ske_keypad_chip_init()
109 	 * keypad dbounce is configured in DBCR[15:8]  in ske_keypad_chip_init()
112 	spin_lock(&keypad->ske_keypad_lock);  in ske_keypad_chip_init()
113 	value = readl(keypad->reg_base + SKE_DBCR);  in ske_keypad_chip_init()
115 	value |= ((keypad->board->debounce_ms * 32000)/32768) << 8;  in ske_keypad_chip_init()
116 	writel(value, keypad->reg_base + SKE_DBCR);  in ske_keypad_chip_init()
117 	spin_unlock(&keypad->ske_keypad_lock);  in ske_keypad_chip_init()
120 	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);  in ske_keypad_chip_init()
124 	 * KPCN[5:3] defines no. of keypad columns to be auto scanned  in ske_keypad_chip_init()
126 	value = (keypad->board->kcol - 1) << 3;  in ske_keypad_chip_init()
127 	ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);  in ske_keypad_chip_init()
129 	/* clear keypad interrupt for auto(and pending SW) scans */  in ske_keypad_chip_init()
130 	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA | SKE_KPICS);  in ske_keypad_chip_init()
132 	/* un-mask keypad interrupts */  in ske_keypad_chip_init()
133 	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);  in ske_keypad_chip_init()
136 	ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);  in ske_keypad_chip_init()
141 static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col)  in ske_keypad_report()  argument
144 	struct input_dev *input = keypad->input;  in ske_keypad_report()
157 		ske_ris = readl(keypad->reg_base + SKE_RIS);  in ske_keypad_report()
161 		input_report_key(input, keypad->keymap[code], key_pressed);  in ske_keypad_report()
167 static void ske_keypad_read_data(struct ske_keypad *keypad)  in ske_keypad_read_data()  argument
181 		ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));  in ske_keypad_read_data()
189 			ske_keypad_report(keypad, status, col);  in ske_keypad_read_data()
194 			ske_keypad_report(keypad, status, col);  in ske_keypad_read_data()
201 	struct ske_keypad *keypad = dev_id;  in ske_keypad_irq()  local
202 	int timeout = keypad->board->debounce_ms;  in ske_keypad_irq()
205 	ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);  in ske_keypad_irq()
206 	ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);  in ske_keypad_irq()
208 	while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout)  in ske_keypad_irq()
212 	ske_keypad_read_data(keypad);  in ske_keypad_irq()
215 	while ((readl(keypad->reg_base + SKE_RIS)) && --timeout)  in ske_keypad_irq()
219 	ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);  in ske_keypad_irq()
228 	struct ske_keypad *keypad;  in ske_keypad_probe()  local
235 		dev_err(&pdev->dev, "invalid keypad platform data\n");  in ske_keypad_probe()
249 	keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL);  in ske_keypad_probe()
251 	if (!keypad || !input) {  in ske_keypad_probe()
252 		dev_err(&pdev->dev, "failed to allocate keypad memory\n");  in ske_keypad_probe()
257 	keypad->irq = irq;  in ske_keypad_probe()
258 	keypad->board = plat;  in ske_keypad_probe()
259 	keypad->input = input;  in ske_keypad_probe()
260 	spin_lock_init(&keypad->ske_keypad_lock);  in ske_keypad_probe()
268 	keypad->reg_base = ioremap(res->start, resource_size(res));  in ske_keypad_probe()
269 	if (!keypad->reg_base) {  in ske_keypad_probe()
275 	keypad->pclk = clk_get(&pdev->dev, "apb_pclk");  in ske_keypad_probe()
276 	if (IS_ERR(keypad->pclk)) {  in ske_keypad_probe()
278 		error = PTR_ERR(keypad->pclk);  in ske_keypad_probe()
282 	keypad->clk = clk_get(&pdev->dev, NULL);  in ske_keypad_probe()
283 	if (IS_ERR(keypad->clk)) {  in ske_keypad_probe()
285 		error = PTR_ERR(keypad->clk);  in ske_keypad_probe()
290 	input->name = "ux500-ske-keypad";  in ske_keypad_probe()
295 					   keypad->keymap, input);  in ske_keypad_probe()
305 	error = clk_prepare_enable(keypad->pclk);  in ske_keypad_probe()
311 	error = clk_prepare_enable(keypad->clk);  in ske_keypad_probe()
319 	if (keypad->board->init)  in ske_keypad_probe()
320 		keypad->board->init();  in ske_keypad_probe()
322 	error = ske_keypad_chip_init(keypad);  in ske_keypad_probe()
324 		dev_err(&pdev->dev, "unable to init keypad hardware\n");  in ske_keypad_probe()
328 	error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq,  in ske_keypad_probe()
329 				     IRQF_ONESHOT, "ske-keypad", keypad);  in ske_keypad_probe()
331 		dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);  in ske_keypad_probe()
345 	platform_set_drvdata(pdev, keypad);  in ske_keypad_probe()
350 	free_irq(keypad->irq, keypad);  in ske_keypad_probe()
352 	clk_disable_unprepare(keypad->clk);  in ske_keypad_probe()
354 	clk_disable_unprepare(keypad->pclk);  in ske_keypad_probe()
356 	clk_put(keypad->clk);  in ske_keypad_probe()
358 	clk_put(keypad->pclk);  in ske_keypad_probe()
360 	iounmap(keypad->reg_base);  in ske_keypad_probe()
365 	kfree(keypad);  in ske_keypad_probe()
371 	struct ske_keypad *keypad = platform_get_drvdata(pdev);  in ske_keypad_remove()  local
374 	free_irq(keypad->irq, keypad);  in ske_keypad_remove()
376 	input_unregister_device(keypad->input);  in ske_keypad_remove()
378 	clk_disable_unprepare(keypad->clk);  in ske_keypad_remove()
379 	clk_put(keypad->clk);  in ske_keypad_remove()
381 	if (keypad->board->exit)  in ske_keypad_remove()
382 		keypad->board->exit();  in ske_keypad_remove()
384 	iounmap(keypad->reg_base);  in ske_keypad_remove()
386 	kfree(keypad);  in ske_keypad_remove()
395 	struct ske_keypad *keypad = platform_get_drvdata(pdev);  in ske_keypad_suspend()  local
401 		ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);  in ske_keypad_suspend()
409 	struct ske_keypad *keypad = platform_get_drvdata(pdev);  in ske_keypad_resume()  local
415 		ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);  in ske_keypad_resume()
426 		.name = "nmk-ske-keypad",
436 MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
437 MODULE_ALIAS("platform:nomadik-ske-keypad");