3  * Power Management and GPIO expander driver for MPC8349E-mITX-compatible MCU
25  * I don't have specifications for the MCU firmware, I found this register
34 struct mcu {  struct
41 static struct mcu *glob_mcu;  argument
47 	struct mcu *mcu = glob_mcu;  in shutdown_thread_fn()  local
50 		ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL);  in shutdown_thread_fn()
52 			pr_err("MCU status reg read failed.\n");  in shutdown_thread_fn()
53 		mcu->reg_ctrl = ret;  in shutdown_thread_fn()
56 		if (mcu->reg_ctrl & MCU_CTRL_BTN) {  in shutdown_thread_fn()
57 			i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL,  in shutdown_thread_fn()
58 						  mcu->reg_ctrl & ~MCU_CTRL_BTN);  in shutdown_thread_fn()
74 	struct mcu *mcu = glob_mcu;  in show_status()  local
76 	ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL);  in show_status()
79 	mcu->reg_ctrl = ret;  in show_status()
87 	struct mcu *mcu = glob_mcu;  in mcu_power_off()  local
89 	pr_info("Sending power-off request to the MCU...\n");  in mcu_power_off()
90 	mutex_lock(&mcu->lock);  in mcu_power_off()
91 	i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL,  in mcu_power_off()
92 				  mcu->reg_ctrl | MCU_CTRL_POFF);  in mcu_power_off()
93 	mutex_unlock(&mcu->lock);  in mcu_power_off()
98 	struct mcu *mcu = gpiochip_get_data(gc);  in mcu_gpio_set()  local
101 	mutex_lock(&mcu->lock);  in mcu_gpio_set()
103 		mcu->reg_ctrl &= ~bit;  in mcu_gpio_set()
105 		mcu->reg_ctrl |= bit;  in mcu_gpio_set()
107 	i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL, mcu->reg_ctrl);  in mcu_gpio_set()
108 	mutex_unlock(&mcu->lock);  in mcu_gpio_set()
117 static int mcu_gpiochip_add(struct mcu *mcu)  in mcu_gpiochip_add()  argument
120 	struct gpio_chip *gc = &mcu->gc;  in mcu_gpiochip_add()
122 	np = of_find_compatible_node(NULL, NULL, "fsl,mcu-mpc8349emitx");  in mcu_gpiochip_add()
135 	return gpiochip_add_data(gc, mcu);  in mcu_gpiochip_add()
138 static int mcu_gpiochip_remove(struct mcu *mcu)  in mcu_gpiochip_remove()  argument
140 	kfree(mcu->gc.label);  in mcu_gpiochip_remove()
141 	gpiochip_remove(&mcu->gc);  in mcu_gpiochip_remove()
147 	struct mcu *mcu;  in mcu_probe()  local
150 	mcu = kzalloc(sizeof(*mcu), GFP_KERNEL);  in mcu_probe()
151 	if (!mcu)  in mcu_probe()
154 	mutex_init(&mcu->lock);  in mcu_probe()
155 	mcu->client = client;  in mcu_probe()
156 	i2c_set_clientdata(client, mcu);  in mcu_probe()
158 	ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL);  in mcu_probe()
161 	mcu->reg_ctrl = ret;  in mcu_probe()
163 	ret = mcu_gpiochip_add(mcu);  in mcu_probe()
169 		glob_mcu = mcu;  in mcu_probe()
179 				      "mcu-i2c-shdn");  in mcu_probe()
183 	kfree(mcu);  in mcu_probe()
189 	struct mcu *mcu = i2c_get_clientdata(client);  in mcu_remove()  local
196 	if (glob_mcu == mcu) {  in mcu_remove()
201 	ret = mcu_gpiochip_remove(mcu);  in mcu_remove()
204 	kfree(mcu);  in mcu_remove()
209 	{ "mcu-mpc8349emitx", },
215 	{ .compatible = "fsl,mcu-mpc8349emitx", },
221 		.name = "mcu-mpc8349emitx",
232 		   "MPC8349E-mITX-compatible MCU");