diff options
Diffstat (limited to 'arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c')
| -rw-r--r-- | arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c | 81 |
1 files changed, 62 insertions, 19 deletions
diff --git a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c index 70798ac911e..e238b6a55b1 100644 --- a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c +++ b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c @@ -11,7 +11,6 @@ * (at your option) any later version. */ -#include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/device.h> @@ -21,6 +20,8 @@ #include <linux/of.h> #include <linux/of_gpio.h> #include <linux/slab.h> +#include <linux/kthread.h> +#include <linux/reboot.h> #include <asm/prom.h> #include <asm/machdep.h> @@ -30,6 +31,7 @@ */ #define MCU_REG_CTRL 0x20 #define MCU_CTRL_POFF 0x40 +#define MCU_CTRL_BTN 0x80 #define MCU_NUM_GPIO 2 @@ -42,13 +44,55 @@ struct mcu { static struct mcu *glob_mcu; +struct task_struct *shutdown_thread; +static int shutdown_thread_fn(void *data) +{ + int ret; + struct mcu *mcu = glob_mcu; + + while (!kthread_should_stop()) { + ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL); + if (ret < 0) + pr_err("MCU status reg read failed.\n"); + mcu->reg_ctrl = ret; + + + if (mcu->reg_ctrl & MCU_CTRL_BTN) { + i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL, + mcu->reg_ctrl & ~MCU_CTRL_BTN); + + ctrl_alt_del(); + } + + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(HZ); + } + + return 0; +} + +static ssize_t show_status(struct device *d, + struct device_attribute *attr, char *buf) +{ + int ret; + struct mcu *mcu = glob_mcu; + + ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL); + if (ret < 0) + return -ENODEV; + mcu->reg_ctrl = ret; + + return sprintf(buf, "%02x\n", ret); +} +static DEVICE_ATTR(status, S_IRUGO, show_status, NULL); + static void mcu_power_off(void) { struct mcu *mcu = glob_mcu; pr_info("Sending power-off request to the MCU...\n"); mutex_lock(&mcu->lock); - i2c_smbus_write_byte_data(glob_mcu->client, MCU_REG_CTRL, + i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL, mcu->reg_ctrl | MCU_CTRL_POFF); mutex_unlock(&mcu->lock); } @@ -100,8 +144,7 @@ static int mcu_gpiochip_remove(struct mcu *mcu) return gpiochip_remove(&mcu->gc); } -static int __devinit mcu_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int mcu_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct mcu *mcu; int ret; @@ -130,17 +173,28 @@ static int __devinit mcu_probe(struct i2c_client *client, dev_info(&client->dev, "will provide power-off service\n"); } + if (device_create_file(&client->dev, &dev_attr_status)) + dev_err(&client->dev, + "couldn't create device file for status\n"); + + shutdown_thread = kthread_run(shutdown_thread_fn, NULL, + "mcu-i2c-shdn"); + return 0; err: kfree(mcu); return ret; } -static int __devexit mcu_remove(struct i2c_client *client) +static int mcu_remove(struct i2c_client *client) { struct mcu *mcu = i2c_get_clientdata(client); int ret; + kthread_stop(shutdown_thread); + + device_remove_file(&client->dev, &dev_attr_status); + if (glob_mcu == mcu) { ppc_md.power_off = NULL; glob_mcu = NULL; @@ -149,7 +203,6 @@ static int __devexit mcu_remove(struct i2c_client *client) ret = mcu_gpiochip_remove(mcu); if (ret) return ret; - i2c_set_clientdata(client, NULL); kfree(mcu); return 0; } @@ -160,7 +213,7 @@ static const struct i2c_device_id mcu_ids[] = { }; MODULE_DEVICE_TABLE(i2c, mcu_ids); -static struct of_device_id mcu_of_match_table[] __devinitdata = { +static struct of_device_id mcu_of_match_table[] = { { .compatible = "fsl,mcu-mpc8349emitx", }, { }, }; @@ -172,21 +225,11 @@ static struct i2c_driver mcu_driver = { .of_match_table = mcu_of_match_table, }, .probe = mcu_probe, - .remove = __devexit_p(mcu_remove), + .remove = mcu_remove, .id_table = mcu_ids, }; -static int __init mcu_init(void) -{ - return i2c_add_driver(&mcu_driver); -} -module_init(mcu_init); - -static void __exit mcu_exit(void) -{ - i2c_del_driver(&mcu_driver); -} -module_exit(mcu_exit); +module_i2c_driver(mcu_driver); MODULE_DESCRIPTION("Power Management and GPIO expander driver for " "MPC8349E-mITX-compatible MCU"); |