26 static u8 ibm_panel_calculate_checksum(struct ibm_panel *panel)  in ibm_panel_calculate_checksum()  argument
32 	for (i = 0; i < sizeof(panel->command) - 1; ++i) {  in ibm_panel_calculate_checksum()
33 		sum += panel->command[i];  in ibm_panel_calculate_checksum()
47 static void ibm_panel_process_command(struct ibm_panel *panel)  in ibm_panel_process_command()  argument
52 	if (panel->command[0] != 0xff && panel->command[1] != 0xf0) {  in ibm_panel_process_command()
53 		dev_dbg(&panel->input->dev, "command invalid: %02x %02x\n",  in ibm_panel_process_command()
54 			panel->command[0], panel->command[1]);  in ibm_panel_process_command()
58 	chksum = ibm_panel_calculate_checksum(panel);  in ibm_panel_process_command()
59 	if (chksum != panel->command[sizeof(panel->command) - 1]) {  in ibm_panel_process_command()
60 		dev_dbg(&panel->input->dev,  in ibm_panel_process_command()
62 			panel->command[sizeof(panel->command) - 1]);  in ibm_panel_process_command()
66 	button = panel->command[2] & 0xf;  in ibm_panel_process_command()
68 		input_report_key(panel->input, panel->keycodes[button],  in ibm_panel_process_command()
69 				 !(panel->command[2] & 0x80));  in ibm_panel_process_command()
70 		input_sync(panel->input);  in ibm_panel_process_command()
72 		dev_dbg(&panel->input->dev, "unknown button %u\n",  in ibm_panel_process_command()
80 	struct ibm_panel *panel = i2c_get_clientdata(client);  in ibm_panel_i2c_slave_cb()  local
82 	dev_dbg(&panel->input->dev, "event: %u data: %02x\n", event, *val);  in ibm_panel_i2c_slave_cb()
84 	guard(spinlock_irqsave)(&panel->lock);  in ibm_panel_i2c_slave_cb()
88 		if (panel->idx == sizeof(panel->command))  in ibm_panel_i2c_slave_cb()
89 			ibm_panel_process_command(panel);  in ibm_panel_i2c_slave_cb()
91 			dev_dbg(&panel->input->dev,  in ibm_panel_i2c_slave_cb()
92 				"command incorrect size %u\n", panel->idx);  in ibm_panel_i2c_slave_cb()
95 		panel->idx = 0;  in ibm_panel_i2c_slave_cb()
98 		if (panel->idx < sizeof(panel->command))  in ibm_panel_i2c_slave_cb()
99 			panel->command[panel->idx++] = *val;  in ibm_panel_i2c_slave_cb()
106 			panel->idx = U8_MAX;  in ibm_panel_i2c_slave_cb()
121 	struct ibm_panel *panel;  in ibm_panel_probe()  local
125 	panel = devm_kzalloc(&client->dev, sizeof(*panel), GFP_KERNEL);  in ibm_panel_probe()
126 	if (!panel)  in ibm_panel_probe()
129 	spin_lock_init(&panel->lock);  in ibm_panel_probe()
131 	panel->input = devm_input_allocate_device(&client->dev);  in ibm_panel_probe()
132 	if (!panel->input)  in ibm_panel_probe()
135 	panel->input->name = client->name;  in ibm_panel_probe()
136 	panel->input->id.bustype = BUS_I2C;  in ibm_panel_probe()
140 					       panel->keycodes,  in ibm_panel_probe()
147 		panel->keycodes[0] = BTN_NORTH;  in ibm_panel_probe()
148 		panel->keycodes[1] = BTN_SOUTH;  in ibm_panel_probe()
149 		panel->keycodes[2] = BTN_SELECT;  in ibm_panel_probe()
153 		input_set_capability(panel->input, EV_KEY, panel->keycodes[i]);  in ibm_panel_probe()
155 	error = input_register_device(panel->input);  in ibm_panel_probe()
162 	i2c_set_clientdata(client, panel);  in ibm_panel_probe()