55 	struct nspire_keypad *keypad = dev_id;  in nspire_keypad_irq()  local
56 	struct input_dev *input = keypad->input;  in nspire_keypad_irq()
64 	int_sts = readl(keypad->reg_base + KEYPAD_INT) & keypad->int_mask;  in nspire_keypad_irq()
68 	memcpy_fromio(state, keypad->reg_base + KEYPAD_DATA, sizeof(state));  in nspire_keypad_irq()
72 		if (keypad->active_low)  in nspire_keypad_irq()
75 		changed = bits ^ keypad->state[row];  in nspire_keypad_irq()
79 		keypad->state[row] = bits;  in nspire_keypad_irq()
85 			code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);  in nspire_keypad_irq()
94 	writel(0x3, keypad->reg_base + KEYPAD_INT);  in nspire_keypad_irq()
99 static int nspire_keypad_chip_init(struct nspire_keypad *keypad)  in nspire_keypad_chip_init()  argument
103 	cycles_per_us = (clk_get_rate(keypad->clk) / 1000000);  in nspire_keypad_chip_init()
107 	delay_cycles = cycles_per_us * keypad->scan_interval;  in nspire_keypad_chip_init()
111 	row_delay_cycles = cycles_per_us * keypad->row_delay;  in nspire_keypad_chip_init()
118 	writel(val, keypad->reg_base + KEYPAD_SCAN_MODE);  in nspire_keypad_chip_init()
121 	writel(val, keypad->reg_base + KEYPAD_CNTL);  in nspire_keypad_chip_init()
124 	keypad->int_mask = 1 << 1;  in nspire_keypad_chip_init()
125 	writel(keypad->int_mask, keypad->reg_base + KEYPAD_INTMSK);  in nspire_keypad_chip_init()
129 	writel(0, keypad->reg_base + KEYPAD_UNKNOWN_INT);  in nspire_keypad_chip_init()
131 	writel(~0, keypad->reg_base + KEYPAD_UNKNOWN_INT_STS);  in nspire_keypad_chip_init()
138 	struct nspire_keypad *keypad = input_get_drvdata(input);  in nspire_keypad_open()  local
141 	error = clk_prepare_enable(keypad->clk);  in nspire_keypad_open()
145 	error = nspire_keypad_chip_init(keypad);  in nspire_keypad_open()
147 		clk_disable_unprepare(keypad->clk);  in nspire_keypad_open()
156 	struct nspire_keypad *keypad = input_get_drvdata(input);  in nspire_keypad_close()  local
158 	clk_disable_unprepare(keypad->clk);  in nspire_keypad_close()
164 	struct nspire_keypad *keypad;  in nspire_keypad_probe()  local
176 	keypad = devm_kzalloc(&pdev->dev, sizeof(struct nspire_keypad),  in nspire_keypad_probe()
178 	if (!keypad) {  in nspire_keypad_probe()
183 	keypad->row_shift = get_count_order(KEYPAD_BITMASK_COLS);  in nspire_keypad_probe()
186 				     &keypad->scan_interval);  in nspire_keypad_probe()
193 				     &keypad->row_delay);  in nspire_keypad_probe()
199 	keypad->active_low = of_property_read_bool(of_node, "active-low");  in nspire_keypad_probe()
201 	keypad->clk = devm_clk_get(&pdev->dev, NULL);  in nspire_keypad_probe()
202 	if (IS_ERR(keypad->clk)) {  in nspire_keypad_probe()
204 		return PTR_ERR(keypad->clk);  in nspire_keypad_probe()
208 	keypad->reg_base = devm_ioremap_resource(&pdev->dev, res);  in nspire_keypad_probe()
209 	if (IS_ERR(keypad->reg_base))  in nspire_keypad_probe()
210 		return PTR_ERR(keypad->reg_base);  in nspire_keypad_probe()
212 	keypad->input = input = devm_input_allocate_device(&pdev->dev);  in nspire_keypad_probe()
218 	input_set_drvdata(input, keypad);  in nspire_keypad_probe()
239 				 "nspire_keypad", keypad);  in nspire_keypad_probe()
254 		res, keypad->row_delay, keypad->scan_interval,  in nspire_keypad_probe()
255 		keypad->active_low ? ", active_low" : "");  in nspire_keypad_probe()