52 	struct nspire_keypad *keypad = dev_id;  in nspire_keypad_irq()  local
53 	struct input_dev *input = keypad->input;  in nspire_keypad_irq()
61 	int_sts = readl(keypad->reg_base + KEYPAD_INT) & keypad->int_mask;  in nspire_keypad_irq()
65 	memcpy_fromio(state, keypad->reg_base + KEYPAD_DATA, sizeof(state));  in nspire_keypad_irq()
69 		if (keypad->active_low)  in nspire_keypad_irq()
72 		changed = bits ^ keypad->state[row];  in nspire_keypad_irq()
76 		keypad->state[row] = bits;  in nspire_keypad_irq()
82 			code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);  in nspire_keypad_irq()
91 	writel(0x3, keypad->reg_base + KEYPAD_INT);  in nspire_keypad_irq()
96 static int nspire_keypad_chip_init(struct nspire_keypad *keypad)  in nspire_keypad_chip_init()  argument
100 	cycles_per_us = (clk_get_rate(keypad->clk) / 1000000);  in nspire_keypad_chip_init()
104 	delay_cycles = cycles_per_us * keypad->scan_interval;  in nspire_keypad_chip_init()
108 	row_delay_cycles = cycles_per_us * keypad->row_delay;  in nspire_keypad_chip_init()
115 	writel(val, keypad->reg_base + KEYPAD_SCAN_MODE);  in nspire_keypad_chip_init()
118 	writel(val, keypad->reg_base + KEYPAD_CNTL);  in nspire_keypad_chip_init()
121 	keypad->int_mask = 1 << 1;  in nspire_keypad_chip_init()
122 	writel(keypad->int_mask, keypad->reg_base + KEYPAD_INTMSK);  in nspire_keypad_chip_init()
126 	writel(0, keypad->reg_base + KEYPAD_UNKNOWN_INT);  in nspire_keypad_chip_init()
128 	writel(~0, keypad->reg_base + KEYPAD_UNKNOWN_INT_STS);  in nspire_keypad_chip_init()
135 	struct nspire_keypad *keypad = input_get_drvdata(input);  in nspire_keypad_open()  local
138 	error = clk_prepare_enable(keypad->clk);  in nspire_keypad_open()
142 	error = nspire_keypad_chip_init(keypad);  in nspire_keypad_open()
144 		clk_disable_unprepare(keypad->clk);  in nspire_keypad_open()
153 	struct nspire_keypad *keypad = input_get_drvdata(input);  in nspire_keypad_close()  local
155 	clk_disable_unprepare(keypad->clk);  in nspire_keypad_close()
161 	struct nspire_keypad *keypad;  in nspire_keypad_probe()  local
171 	keypad = devm_kzalloc(&pdev->dev, sizeof(struct nspire_keypad),  in nspire_keypad_probe()
173 	if (!keypad) {  in nspire_keypad_probe()
174 		dev_err(&pdev->dev, "failed to allocate keypad memory\n");  in nspire_keypad_probe()
178 	keypad->row_shift = get_count_order(KEYPAD_BITMASK_COLS);  in nspire_keypad_probe()
181 				     &keypad->scan_interval);  in nspire_keypad_probe()
188 				     &keypad->row_delay);  in nspire_keypad_probe()
194 	keypad->active_low = of_property_read_bool(of_node, "active-low");  in nspire_keypad_probe()
196 	keypad->clk = devm_clk_get(&pdev->dev, NULL);  in nspire_keypad_probe()
197 	if (IS_ERR(keypad->clk)) {  in nspire_keypad_probe()
199 		return PTR_ERR(keypad->clk);  in nspire_keypad_probe()
203 	keypad->reg_base = devm_ioremap_resource(&pdev->dev, res);  in nspire_keypad_probe()
204 	if (IS_ERR(keypad->reg_base))  in nspire_keypad_probe()
205 		return PTR_ERR(keypad->reg_base);  in nspire_keypad_probe()
207 	keypad->input = input = devm_input_allocate_device(&pdev->dev);  in nspire_keypad_probe()
213 	input_set_drvdata(input, keypad);  in nspire_keypad_probe()
216 	input->name = "nspire-keypad";  in nspire_keypad_probe()
234 				 "nspire_keypad", keypad);  in nspire_keypad_probe()
248 		"TI-NSPIRE keypad at %pR (scan_interval=%uus, row_delay=%uus%s)\n",  in nspire_keypad_probe()
249 		res, keypad->row_delay, keypad->scan_interval,  in nspire_keypad_probe()
250 		keypad->active_low ? ", active_low" : "");  in nspire_keypad_probe()
256 	{ .compatible = "ti,nspire-keypad" },
263 		.name = "nspire-keypad",
272 MODULE_DESCRIPTION("TI-NSPIRE Keypad Driver");