1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * dm355evm_keys.c - support buttons and IR remote on DM355 EVM board
7 #include <linux/kernel.h>
8 #include <linux/slab.h>
9 #include <linux/input.h>
10 #include <linux/input/sparse-keymap.h>
11 #include <linux/platform_device.h>
12 #include <linux/interrupt.h>
14 #include <linux/mfd/dm355evm_msp.h>
15 #include <linux/module.h>
19  * The MSP430 firmware on the DM355 EVM monitors on-board pushbuttons
21  * pressed, or its autorepeat kicks in, an event is sent.  This driver
22  * read those events from the small (32 event) queue and reports them.
40 	 * is to the right.  (That is, rotate the board counter-clockwise
50 	 * IR buttons ... codes assigned to match the universal remote
53 	 * These event codes match firmware documentation, but other
54 	 * remote controls could easily send more RC5-encoded events.
58 	 * RC5 codes are 14 bits, with two start bits (0x3 prefix)
94  * in Linux sleep, we use a threaded IRQ handler.  The IRQ itself is
106 	u16 event;  in dm355evm_keys_irq()  local
115 			dev_dbg(keys->dev, "input high err %d\n",  in dm355evm_keys_irq()
119 		event = status << 8;  in dm355evm_keys_irq()
123 			dev_dbg(keys->dev, "input low err %d\n",  in dm355evm_keys_irq()
127 		event |= status;  in dm355evm_keys_irq()
128 		if (event == 0xdead)  in dm355evm_keys_irq()
134 		 * distinguish (for example) "1-autorepeat" from "1 1";  in dm355evm_keys_irq()
138 		 * mapping events to a press/release event pair; then  in dm355evm_keys_irq()
139 		 * to avoid adding extra events, skip the second event  in dm355evm_keys_irq()
142 		if (event == last_event) {  in dm355evm_keys_irq()
146 		last_event = event;  in dm355evm_keys_irq()
149 		event &= ~0x0800;  in dm355evm_keys_irq()
152 		ke = sparse_keymap_entry_from_scancode(keys->input, event);  in dm355evm_keys_irq()
153 		keycode = ke ? ke->keycode : KEY_UNKNOWN;  in dm355evm_keys_irq()
154 		dev_dbg(keys->dev,  in dm355evm_keys_irq()
155 			"input event 0x%04x--> keycode %d\n",  in dm355evm_keys_irq()
156 			event, keycode);  in dm355evm_keys_irq()
159 		input_report_key(keys->input, keycode, 1);  in dm355evm_keys_irq()
160 		input_sync(keys->input);  in dm355evm_keys_irq()
161 		input_report_key(keys->input, keycode, 0);  in dm355evm_keys_irq()
162 		input_sync(keys->input);  in dm355evm_keys_irq()
168 /*----------------------------------------------------------------------*/
177 	keys = devm_kzalloc(&pdev->dev, sizeof (*keys), GFP_KERNEL);  in dm355evm_keys_probe()
179 		return -ENOMEM;  in dm355evm_keys_probe()
181 	input = devm_input_allocate_device(&pdev->dev);  in dm355evm_keys_probe()
183 		return -ENOMEM;  in dm355evm_keys_probe()
185 	keys->dev = &pdev->dev;  in dm355evm_keys_probe()
186 	keys->input = input;  in dm355evm_keys_probe()
188 	input->name = "DM355 EVM Controls";  in dm355evm_keys_probe()
189 	input->phys = "dm355evm/input0";  in dm355evm_keys_probe()
191 	input->id.bustype = BUS_I2C;  in dm355evm_keys_probe()
192 	input->id.product = 0x0355;  in dm355evm_keys_probe()
193 	input->id.version = dm355evm_msp_read(DM355EVM_MSP_FIRMREV);  in dm355evm_keys_probe()
199 	/* REVISIT:  flush the event queue? */  in dm355evm_keys_probe()
206 	error = devm_request_threaded_irq(&pdev->dev, irq,  in dm355evm_keys_probe()
209 					  dev_name(&pdev->dev), keys);  in dm355evm_keys_probe()
222  * be able to wake up the system.  When device_may_wakeup(&pdev->dev), call