--- /dev/null
+/*
+ * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
+ * sensors, fan control, keyboard backlight control) used in Intel-based Apple
+ * computers.
+ *
+ * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
+ * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
+ *
+ * Based on hdaps.c driver:
+ * Copyright (C) 2005 Robert Love <rml@novell.com>
+ * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
+ *
+ * Fan control based on smcFanControl:
+ * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License v2 as published by the
+ * Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/input-polldev.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/dmi.h>
+#include <linux/mutex.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/io.h>
+#include <linux/leds.h>
+#include <linux/hwmon.h>
+#include <linux/workqueue.h>
+#include <linux/err.h>
+
+/* data port used by Apple SMC */
+#define APPLESMC_DATA_PORT 0x300
+/* command/status port used by Apple SMC */
+#define APPLESMC_CMD_PORT 0x304
+
+#define APPLESMC_NR_PORTS 32 /* 0x300-0x31f */
+
+#define APPLESMC_MAX_DATA_LENGTH 32
+
+/* wait up to 128 ms for a status change. */
+#define APPLESMC_MIN_WAIT 0x0010
+#define APPLESMC_RETRY_WAIT 0x0100
+#define APPLESMC_MAX_WAIT 0x20000
+
+#define APPLESMC_READ_CMD 0x10
+#define APPLESMC_WRITE_CMD 0x11
+#define APPLESMC_GET_KEY_BY_INDEX_CMD 0x12
+#define APPLESMC_GET_KEY_TYPE_CMD 0x13
+
+#define KEY_COUNT_KEY "#KEY" /* r-o ui32 */
+
+#define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6-10 bytes) */
+#define LIGHT_SENSOR_RIGHT_KEY "ALV1" /* r-o {alv (6-10 bytes) */
+#define BACKLIGHT_KEY "LKSB" /* w-o {lkb (2 bytes) */
+
+#define CLAMSHELL_KEY "MSLD" /* r-o ui8 (unused) */
+
+#define MOTION_SENSOR_X_KEY "MO_X" /* r-o sp78 (2 bytes) */
+#define MOTION_SENSOR_Y_KEY "MO_Y" /* r-o sp78 (2 bytes) */
+#define MOTION_SENSOR_Z_KEY "MO_Z" /* r-o sp78 (2 bytes) */
+#define MOTION_SENSOR_KEY "MOCN" /* r/w ui16 */
+
+#define FANS_COUNT "FNum" /* r-o ui8 */
+#define FANS_MANUAL "FS! " /* r-w ui16 */
+#define FAN_ID_FMT "F%dID" /* r-o char[16] */
+
+#define TEMP_SENSOR_TYPE "sp78"
+
+/* List of keys used to read/write fan speeds */
+static const char *const fan_speed_fmt[] = {
+ "F%dAc", /* actual speed */
+ "F%dMn", /* minimum speed (rw) */
+ "F%dMx", /* maximum speed */
+ "F%dSf", /* safe speed - not all models */
+ "F%dTg", /* target speed (manual: rw) */
+};
+
+#define INIT_TIMEOUT_MSECS 5000 /* wait up to 5s for device init ... */
+#define INIT_WAIT_MSECS 50 /* ... in 50ms increments */
+
+#define APPLESMC_POLL_INTERVAL 50 /* msecs */
+#define APPLESMC_INPUT_FUZZ 4 /* input event threshold */
+#define APPLESMC_INPUT_FLAT 4
+
+#define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
+#define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
+
+/* Dynamic device node attributes */
+struct applesmc_dev_attr {
+ struct sensor_device_attribute sda; /* hwmon attributes */
+ char name[32]; /* room for node file name */
+};
+
+/* Dynamic device node group */
+struct applesmc_node_group {
+ char *format; /* format string */
+ void *show; /* show function */
+ void *store; /* store function */
+ int option; /* function argument */
+ struct applesmc_dev_attr *nodes; /* dynamic node array */
+};
+
+/* AppleSMC entry - cached register information */
+struct applesmc_entry {
+ char key[5]; /* four-letter key code */
+ u8 valid; /* set when entry is successfully read once */
+ u8 len; /* bounded by APPLESMC_MAX_DATA_LENGTH */
+ char type[5]; /* four-letter type code */
+ u8 flags; /* 0x10: func; 0x40: write; 0x80: read */
+};
+
+/* Register lookup and registers common to all SMCs */
+static struct applesmc_registers {
+ struct mutex mutex; /* register read/write mutex */
+ unsigned int key_count; /* number of SMC registers */
+ unsigned int fan_count; /* number of fans */
+ unsigned int temp_count; /* number of temperature registers */
+ unsigned int temp_begin; /* temperature lower index bound */
+ unsigned int temp_end; /* temperature upper index bound */
+ unsigned int index_count; /* size of temperature index array */
+ int num_light_sensors; /* number of light sensors */
+ bool has_accelerometer; /* has motion sensor */
+ bool has_key_backlight; /* has keyboard backlight */
+ bool init_complete; /* true when fully initialized */
+ struct applesmc_entry *cache; /* cached key entries */
+ const char **index; /* temperature key index */
+} smcreg = {
+ .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
+};
+
+static const int debug;
+static struct platform_device *pdev;
+static s16 rest_x;
+static s16 rest_y;
+static u8 backlight_state[2];
+
+static struct device *hwmon_dev;
+static struct input_polled_dev *applesmc_idev;
+
+/*
+ * Last index written to key_at_index sysfs file, and value to use for all other
+ * key_at_index_* sysfs files.
+ */
+static unsigned int key_at_index;
+
+static struct workqueue_struct *applesmc_led_wq;
+
+/*
+ * wait_read - Wait for a byte to appear on SMC port. Callers must
+ * hold applesmc_lock.
+ */
+static int wait_read(void)
+{
+ u8 status;
+ int us;
+ for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
+ udelay(us);
+ status = inb(APPLESMC_CMD_PORT);
+ /* read: wait for smc to settle */
+ if (status & 0x01)
+ return 0;
+ }
+
+ pr_warn("wait_read() fail: 0x%02x\n", status);
+ return -EIO;
+}
+
+/*
+ * send_byte - Write to SMC port, retrying when necessary. Callers
+ * must hold applesmc_lock.
+ */
+static int send_byte(u8 cmd, u16 port)
+{
+ u8 status;
+ int us;
+
+ outb(cmd, port);
+ for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
+ udelay(us);
+ status = inb(APPLESMC_CMD_PORT);
+ /* write: wait for smc to settle */
+ if (status & 0x02)
+ continue;
+ /* ready: cmd accepted, return */
+ if (status & 0x04)
+ return 0;
+ /* timeout: give up */
+ if (us << 1 == APPLESMC_MAX_WAIT)
+ break;
+ /* busy: long wait and resend */
+ udelay(APPLESMC_RETRY_WAIT);
+ outb(cmd, port);
+ }
+
+ pr_warn("send_byte(0x%02x, 0x%04x) fail: 0x%02x\n", cmd, port, status);
+ return -EIO;
+}
+
+static int send_command(u8 cmd)
+{
+ return send_byte(cmd, APPLESMC_CMD_PORT);
+}
+
+static int send_argument(const char *key)
+{
+ int i;
+
+ for (i = 0; i < 4; i++)
+ if (send_byte(key[i], APPLESMC_DATA_PORT))
+ return -EIO;
+ return 0;
+}
+
+static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
+{
+ u8 status, data = 0;
+ int i;
+
+ if (send_command(cmd) || send_argument(key)) {
+ pr_warn("%.4s: read arg fail\n", key);
+ return -EIO;
+ }
+
+ /* This has no effect on newer (2012) SMCs */
+ if (send_byte(len, APPLESMC_DATA_PORT)) {
+ pr_warn("%.4s: read len fail\n", key);
+ return -EIO;
+ }
+
+ for (i = 0; i < len; i++) {
+ if (wait_read()) {
+ pr_warn("%.4s: read data[%d] fail\n", key, i);
+ return -EIO;
+ }
+ buffer[i] = inb(APPLESMC_DATA_PORT);
+ }
+
+ /* Read the data port until bit0 is cleared */
+ for (i = 0; i < 16; i++) {
+ udelay(APPLESMC_MIN_WAIT);
+ status = inb(APPLESMC_CMD_PORT);
+ if (!(status & 0x01))
+ break;
+ data = inb(APPLESMC_DATA_PORT);
+ }
+ if (i)
+ pr_warn("flushed %d bytes, last value is: %d\n", i, data);
+
+ return 0;
+}
+
+static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
+{
+ int i;
+
+ if (send_command(cmd) || send_argument(key)) {
+ pr_warn("%s: write arg fail\n", key);
+ return -EIO;
+ }
+
+ if (send_byte(len, APPLESMC_DATA_PORT)) {
+ pr_warn("%.4s: write len fail\n", key);
+ return -EIO;
+ }
+
+ for (i = 0; i < len; i++) {
+ if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
+ pr_warn("%s: write data fail\n", key);
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+static int read_register_count(unsigned int *count)
+{
+ __be32 be;
+ int ret;
+
+ ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
+ if (ret)
+ return ret;
+
+ *count = be32_to_cpu(be);
+ return 0;
+}
+
+/*
+ * Serialized I/O
+ *
+ * Returns zero on success or a negative error on failure.
+ * All functions below are concurrency safe - callers should NOT hold lock.
+ */
+
+static int applesmc_read_entry(const struct applesmc_entry *entry,
+ u8 *buf, u8 len)
+{
+ int ret;
+
+ if (entry->len != len)
+ return -EINVAL;
+ mutex_lock(&smcreg.mutex);
+ ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
+ mutex_unlock(&smcreg.mutex);
+
+ return ret;
+}
+
+static int applesmc_write_entry(const struct applesmc_entry *entry,
+ const u8 *buf, u8 len)
+{
+ int ret;
+
+ if (entry->len != len)
+ return -EINVAL;
+ mutex_lock(&smcreg.mutex);
+ ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
+ mutex_unlock(&smcreg.mutex);
+ return ret;
+}
+
+static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
+{
+ struct applesmc_entry *cache = &smcreg.cache[index];
+ u8 key[4], info[6];
+ __be32 be;
+ int ret = 0;
+
+ if (cache->valid)
+ return cache;
+
+ mutex_lock(&smcreg.mutex);
+
+ if (cache->valid)
+ goto out;
+ be = cpu_to_be32(index);
+ ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
+ if (ret)
+ goto out;
+ ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
+ if (ret)
+ goto out;
+
+ memcpy(cache->key, key, 4);
+ cache->len = info[0];
+ memcpy(cache->type, &info[1], 4);
+ cache->flags = info[5];
+ cache->valid = 1;
+
+out:
+ mutex_unlock(&smcreg.mutex);
+ if (ret)
+ return ERR_PTR(ret);
+ return cache;
+}
+
+static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
+{
+ int begin = 0, end = smcreg.key_count;
+ const struct applesmc_entry *entry;
+
+ while (begin != end) {
+ int middle = begin + (end - begin) / 2;
+ entry = applesmc_get_entry_by_index(middle);
+ if (IS_ERR(entry)) {
+ *lo = 0;
+ return PTR_ERR(entry);
+ }
+ if (strcmp(entry->key, key) < 0)
+ begin = middle + 1;
+ else
+ end = middle;
+ }
+
+ *lo = begin;
+ return 0;
+}
+
+static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
+{
+ int begin = 0, end = smcreg.key_count;
+ const struct applesmc_entry *entry;
+
+ while (begin != end) {
+ int middle = begin + (end - begin) / 2;
+ entry = applesmc_get_entry_by_index(middle);
+ if (IS_ERR(entry)) {
+ *hi = smcreg.key_count;
+ return PTR_ERR(entry);
+ }
+ if (strcmp(key, entry->key) < 0)
+ end = middle;
+ else
+ begin = middle + 1;
+ }
+
+ *hi = begin;
+ return 0;
+}
+
+static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
+{
+ int begin, end;
+ int ret;
+
+ ret = applesmc_get_lower_bound(&begin, key);
+ if (ret)
+ return ERR_PTR(ret);
+ ret = applesmc_get_upper_bound(&end, key);
+ if (ret)
+ return ERR_PTR(ret);
+ if (end - begin != 1)
+ return ERR_PTR(-EINVAL);
+
+ return applesmc_get_entry_by_index(begin);
+}
+
+static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
+{
+ const struct applesmc_entry *entry;
+
+ entry = applesmc_get_entry_by_key(key);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
+
+ return applesmc_read_entry(entry, buffer, len);
+}
+
+static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
+{
+ const struct applesmc_entry *entry;
+
+ entry = applesmc_get_entry_by_key(key);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
+
+ return applesmc_write_entry(entry, buffer, len);
+}
+
+static int applesmc_has_key(const char *key, bool *value)
+{
+ const struct applesmc_entry *entry;
+
+ entry = applesmc_get_entry_by_key(key);
+ if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
+ return PTR_ERR(entry);
+
+ *value = !IS_ERR(entry);
+ return 0;
+}
+
+/*
+ * applesmc_read_s16 - Read 16-bit signed big endian register
+ */
+static int applesmc_read_s16(const char *key, s16 *value)
+{
+ u8 buffer[2];
+ int ret;
+
+ ret = applesmc_read_key(key, buffer, 2);
+ if (ret)
+ return ret;
+
+ *value = ((s16)buffer[0] << 8) | buffer[1];
+ return 0;
+}
+
+/*
+ * applesmc_device_init - initialize the accelerometer. Can sleep.
+ */
+static void applesmc_device_init(void)
+{
+ int total;
+ u8 buffer[2];
+
+ if (!smcreg.has_accelerometer)
+ return;
+
+ for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
+ if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
+ (buffer[0] != 0x00 || buffer[1] != 0x00))
+ return;
+ buffer[0] = 0xe0;
+ buffer[1] = 0x00;
+ applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
+ msleep(INIT_WAIT_MSECS);
+ }
+
+ pr_warn("failed to init the device\n");
+}
+
+static int applesmc_init_index(struct applesmc_registers *s)
+{
+ const struct applesmc_entry *entry;
+ unsigned int i;
+
+ if (s->index)
+ return 0;
+
+ s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
+ if (!s->index)
+ return -ENOMEM;
+
+ for (i = s->temp_begin; i < s->temp_end; i++) {
+ entry = applesmc_get_entry_by_index(i);
+ if (IS_ERR(entry))
+ continue;
+ if (strcmp(entry->type, TEMP_SENSOR_TYPE))
+ continue;
+ s->index[s->index_count++] = entry->key;
+ }
+
+ return 0;
+}
+
+/*
+ * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
+ */
+static int applesmc_init_smcreg_try(void)
+{
+ struct applesmc_registers *s = &smcreg;
+ bool left_light_sensor, right_light_sensor;
+ unsigned int count;
+ u8 tmp[1];
+ int ret;
+
+ if (s->init_complete)
+ return 0;
+
+ ret = read_register_count(&count);
+ if (ret)
+ return ret;
+
+ if (s->cache && s->key_count != count) {
+ pr_warn("key count changed from %d to %d\n",
+ s->key_count, count);
+ kfree(s->cache);
+ s->cache = NULL;
+ }
+ s->key_count = count;
+
+ if (!s->cache)
+ s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
+ if (!s->cache)
+ return -ENOMEM;
+
+ ret = applesmc_read_key(FANS_COUNT, tmp, 1);
+ if (ret)
+ return ret;
+ s->fan_count = tmp[0];
+
+ ret = applesmc_get_lower_bound(&s->temp_begin, "T");
+ if (ret)
+ return ret;
+ ret = applesmc_get_lower_bound(&s->temp_end, "U");
+ if (ret)
+ return ret;
+ s->temp_count = s->temp_end - s->temp_begin;
+
+ ret = applesmc_init_index(s);
+ if (ret)
+ return ret;
+
+ ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
+ if (ret)
+ return ret;
+ ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
+ if (ret)
+ return ret;
+ ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
+ if (ret)
+ return ret;
+ ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
+ if (ret)
+ return ret;
+
+ s->num_light_sensors = left_light_sensor + right_light_sensor;
+ s->init_complete = true;
+
+ pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
+ s->key_count, s->fan_count, s->temp_count, s->index_count,
+ s->has_accelerometer,
+ s->num_light_sensors,
+ s->has_key_backlight);
+
+ return 0;
+}
+
+static void applesmc_destroy_smcreg(void)
+{
+ kfree(smcreg.index);
+ smcreg.index = NULL;
+ kfree(smcreg.cache);
+ smcreg.cache = NULL;
+ smcreg.init_complete = false;
+}
+
+/*
+ * applesmc_init_smcreg - Initialize register cache.
+ *
+ * Retries until initialization is successful, or the operation times out.
+ *
+ */
+static int applesmc_init_smcreg(void)
+{
+ int ms, ret;
+
+ for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
+ ret = applesmc_init_smcreg_try();
+ if (!ret) {
+ if (ms)
+ pr_info("init_smcreg() took %d ms\n", ms);
+ return 0;
+ }
+ msleep(INIT_WAIT_MSECS);
+ }
+
+ applesmc_destroy_smcreg();
+
+ return ret;
+}
+
+/* Device model stuff */
+static int applesmc_probe(struct platform_device *dev)
+{
+ int ret;
+
+ ret = applesmc_init_smcreg();
+ if (ret)
+ return ret;
+
+ applesmc_device_init();
+
+ return 0;
+}
+
+/* Synchronize device with memorized backlight state */
+static int applesmc_pm_resume(struct device *dev)
+{
+ if (smcreg.has_key_backlight)
+ applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
+ return 0;
+}
+
+/* Reinitialize device on resume from hibernation */
+static int applesmc_pm_restore(struct device *dev)
+{
+ applesmc_device_init();
+ return applesmc_pm_resume(dev);
+}
+
+static const struct dev_pm_ops applesmc_pm_ops = {
+ .resume = applesmc_pm_resume,
+ .restore = applesmc_pm_restore,
+};
+
+static struct platform_driver applesmc_driver = {
+ .probe = applesmc_probe,
+ .driver = {
+ .name = "applesmc",
+ .pm = &applesmc_pm_ops,
+ },
+};
+
+/*
+ * applesmc_calibrate - Set our "resting" values. Callers must
+ * hold applesmc_lock.
+ */
+static void applesmc_calibrate(void)
+{
+ applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
+ applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
+ rest_x = -rest_x;
+}
+
+static void applesmc_idev_poll(struct input_polled_dev *dev)
+{
+ struct input_dev *idev = dev->input;
+ s16 x, y;
+
+ if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
+ return;
+ if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
+ return;
+
+ x = -x;
+ input_report_abs(idev, ABS_X, x - rest_x);
+ input_report_abs(idev, ABS_Y, y - rest_y);
+ input_sync(idev);
+}
+
+/* Sysfs Files */
+
+static ssize_t applesmc_name_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "applesmc\n");
+}
+
+static ssize_t applesmc_position_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int ret;
+ s16 x, y, z;
+
+ ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
+ if (ret)
+ goto out;
+ ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
+ if (ret)
+ goto out;
+ ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
+ if (ret)
+ goto out;
+
+out:
+ if (ret)
+ return ret;
+ else
+ return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
+}
+
+static ssize_t applesmc_light_show(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ const struct applesmc_entry *entry;
+ static int data_length;
+ int ret;
+ u8 left = 0, right = 0;
+ u8 buffer[10];
+
+ if (!data_length) {
+ entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
+ if (entry->len > 10)
+ return -ENXIO;
+ data_length = entry->len;
+ pr_info("light sensor data length set to %d\n", data_length);
+ }
+
+ ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
+ /* newer macbooks report a single 10-bit bigendian value */
+ if (data_length == 10) {
+ left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
+ goto out;
+ }
+ left = buffer[2];
+ if (ret)
+ goto out;
+ ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
+ right = buffer[2];
+
+out:
+ if (ret)
+ return ret;
+ else
+ return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
+}
+
+/* Displays sensor key as label */
+static ssize_t applesmc_show_sensor_label(struct device *dev,
+ struct device_attribute *devattr, char *sysfsbuf)
+{
+ const char *key = smcreg.index[to_index(devattr)];
+
+ return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
+}
+
+/* Displays degree Celsius * 1000 */
+static ssize_t applesmc_show_temperature(struct device *dev,
+ struct device_attribute *devattr, char *sysfsbuf)
+{
+ const char *key = smcreg.index[to_index(devattr)];
+ int ret;
+ s16 value;
+ int temp;
+
+ ret = applesmc_read_s16(key, &value);
+ if (ret)
+ return ret;
+
+ temp = 250 * (value >> 6);
+
+ return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp);
+}
+
+static ssize_t applesmc_show_fan_speed(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ int ret;
+ unsigned int speed = 0;
+ char newkey[5];
+ u8 buffer[2];
+
+ sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
+
+ ret = applesmc_read_key(newkey, buffer, 2);
+ speed = ((buffer[0] << 8 | buffer[1]) >> 2);
+
+ if (ret)
+ return ret;
+ else
+ return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
+}
+
+static ssize_t applesmc_store_fan_speed(struct device *dev,
+ struct device_attribute *attr,
+ const char *sysfsbuf, size_t count)
+{
+ int ret;
+ unsigned long speed;
+ char newkey[5];
+ u8 buffer[2];
+
+ if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
+ return -EINVAL; /* Bigger than a 14-bit value */
+
+ sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
+
+ buffer[0] = (speed >> 6) & 0xff;
+ buffer[1] = (speed << 2) & 0xff;
+ ret = applesmc_write_key(newkey, buffer, 2);
+
+ if (ret)
+ return ret;
+ else
+ return count;
+}
+
+static ssize_t applesmc_show_fan_manual(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ int ret;
+ u16 manual = 0;
+ u8 buffer[2];
+
+ ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
+ manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
+
+ if (ret)
+ return ret;
+ else
+ return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
+}
+
+static ssize_t applesmc_store_fan_manual(struct device *dev,
+ struct device_attribute *attr,
+ const char *sysfsbuf, size_t count)
+{
+ int ret;
+ u8 buffer[2];
+ unsigned long input;
+ u16 val;
+
+ if (kstrtoul(sysfsbuf, 10, &input) < 0)
+ return -EINVAL;
+
+ ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
+ val = (buffer[0] << 8 | buffer[1]);
+ if (ret)
+ goto out;
+
+ if (input)
+ val = val | (0x01 << to_index(attr));
+ else
+ val = val & ~(0x01 << to_index(attr));
+
+ buffer[0] = (val >> 8) & 0xFF;
+ buffer[1] = val & 0xFF;
+
+ ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
+
+out:
+ if (ret)
+ return ret;
+ else
+ return count;
+}
+
+static ssize_t applesmc_show_fan_position(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ int ret;
+ char newkey[5];
+ u8 buffer[17];
+
+ sprintf(newkey, FAN_ID_FMT, to_index(attr));
+
+ ret = applesmc_read_key(newkey, buffer, 16);
+ buffer[16] = 0;
+
+ if (ret)
+ return ret;
+ else
+ return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
+}
+
+static ssize_t applesmc_calibrate_show(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
+}
+
+static ssize_t applesmc_calibrate_store(struct device *dev,
+ struct device_attribute *attr, const char *sysfsbuf, size_t count)
+{
+ applesmc_calibrate();
+
+ return count;
+}
+
+static void applesmc_backlight_set(struct work_struct *work)
+{
+ applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
+}
+static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
+
+static void applesmc_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ int ret;
+
+ backlight_state[0] = value;
+ ret = queue_work(applesmc_led_wq, &backlight_work);
+
+ if (debug && (!ret))
+ dev_dbg(led_cdev->dev, "work was already on the queue.\n");
+}
+
+static ssize_t applesmc_key_count_show(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ int ret;
+ u8 buffer[4];
+ u32 count;
+
+ ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
+ count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
+ ((u32)buffer[2]<<8) + buffer[3];
+
+ if (ret)
+ return ret;
+ else
+ return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
+}
+
+static ssize_t applesmc_key_at_index_read_show(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ const struct applesmc_entry *entry;
+ int ret;
+
+ entry = applesmc_get_entry_by_index(key_at_index);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
+ ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
+ if (ret)
+ return ret;
+
+ return entry->len;
+}
+
+static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ const struct applesmc_entry *entry;
+
+ entry = applesmc_get_entry_by_index(key_at_index);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
+
+ return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
+}
+
+static ssize_t applesmc_key_at_index_type_show(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ const struct applesmc_entry *entry;
+
+ entry = applesmc_get_entry_by_index(key_at_index);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
+
+ return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
+}
+
+static ssize_t applesmc_key_at_index_name_show(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ const struct applesmc_entry *entry;
+
+ entry = applesmc_get_entry_by_index(key_at_index);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
+
+ return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
+}
+
+static ssize_t applesmc_key_at_index_show(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
+}
+
+static ssize_t applesmc_key_at_index_store(struct device *dev,
+ struct device_attribute *attr, const char *sysfsbuf, size_t count)
+{
+ unsigned long newkey;
+
+ if (kstrtoul(sysfsbuf, 10, &newkey) < 0
+ || newkey >= smcreg.key_count)
+ return -EINVAL;
+
+ key_at_index = newkey;
+ return count;
+}
+
+static struct led_classdev applesmc_backlight = {
+ .name = "smc::kbd_backlight",
+ .default_trigger = "nand-disk",
+ .brightness_set = applesmc_brightness_set,
+};
+
+static struct applesmc_node_group info_group[] = {
+ { "name", applesmc_name_show },
+ { "key_count", applesmc_key_count_show },
+ { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
+ { "key_at_index_name", applesmc_key_at_index_name_show },
+ { "key_at_index_type", applesmc_key_at_index_type_show },
+ { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
+ { "key_at_index_data", applesmc_key_at_index_read_show },
+ { }
+};
+
+static struct applesmc_node_group accelerometer_group[] = {
+ { "position", applesmc_position_show },
+ { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
+ { }
+};
+
+static struct applesmc_node_group light_sensor_group[] = {
+ { "light", applesmc_light_show },
+ { }
+};
+
+static struct applesmc_node_group fan_group[] = {
+ { "fan%d_label", applesmc_show_fan_position },
+ { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
+ { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
+ { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
+ { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
+ { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
+ { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
+ { }
+};
+
+static struct applesmc_node_group temp_group[] = {
+ { "temp%d_label", applesmc_show_sensor_label },
+ { "temp%d_input", applesmc_show_temperature },
+ { }
+};
+
+/* Module stuff */
+
+/*
+ * applesmc_destroy_nodes - remove files and free associated memory
+ */
+static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
+{
+ struct applesmc_node_group *grp;
+ struct applesmc_dev_attr *node;
+
+ for (grp = groups; grp->nodes; grp++) {
+ for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
+ sysfs_remove_file(&pdev->dev.kobj,
+ &node->sda.dev_attr.attr);
+ kfree(grp->nodes);
+ grp->nodes = NULL;
+ }
+}
+
+/*
+ * applesmc_create_nodes - create a two-dimensional group of sysfs files
+ */
+static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
+{
+ struct applesmc_node_group *grp;
+ struct applesmc_dev_attr *node;
+ struct attribute *attr;
+ int ret, i;
+
+ for (grp = groups; grp->format; grp++) {
+ grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
+ if (!grp->nodes) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ for (i = 0; i < num; i++) {
+ node = &grp->nodes[i];
+ sprintf(node->name, grp->format, i + 1);
+ node->sda.index = (grp->option << 16) | (i & 0xffff);
+ node->sda.dev_attr.show = grp->show;
+ node->sda.dev_attr.store = grp->store;
+ attr = &node->sda.dev_attr.attr;
+ sysfs_attr_init(attr);
+ attr->name = node->name;
+ attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
+ ret = sysfs_create_file(&pdev->dev.kobj, attr);
+ if (ret) {
+ attr->name = NULL;
+ goto out;
+ }
+ }
+ }
+
+ return 0;
+out:
+ applesmc_destroy_nodes(groups);
+ return ret;
+}
+
+/* Create accelerometer ressources */
+static int applesmc_create_accelerometer(void)
+{
+ struct input_dev *idev;
+ int ret;
+
+ if (!smcreg.has_accelerometer)
+ return 0;
+
+ ret = applesmc_create_nodes(accelerometer_group, 1);
+ if (ret)
+ goto out;
+
+ applesmc_idev = input_allocate_polled_device();
+ if (!applesmc_idev) {
+ ret = -ENOMEM;
+ goto out_sysfs;
+ }
+
+ applesmc_idev->poll = applesmc_idev_poll;
+ applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
+
+ /* initial calibrate for the input device */
+ applesmc_calibrate();
+
+ /* initialize the input device */
+ idev = applesmc_idev->input;
+ idev->name = "applesmc";
+ idev->id.bustype = BUS_HOST;
+ idev->dev.parent = &pdev->dev;
+ idev->evbit[0] = BIT_MASK(EV_ABS);
+ input_set_abs_params(idev, ABS_X,
+ -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
+ input_set_abs_params(idev, ABS_Y,
+ -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
+
+ ret = input_register_polled_device(applesmc_idev);
+ if (ret)
+ goto out_idev;
+
+ return 0;
+
+out_idev:
+ input_free_polled_device(applesmc_idev);
+
+out_sysfs:
+ applesmc_destroy_nodes(accelerometer_group);
+
+out:
+ pr_warn("driver init failed (ret=%d)!\n", ret);
+ return ret;
+}
+
+/* Release all ressources used by the accelerometer */
+static void applesmc_release_accelerometer(void)
+{
+ if (!smcreg.has_accelerometer)
+ return;
+ input_unregister_polled_device(applesmc_idev);
+ input_free_polled_device(applesmc_idev);
+ applesmc_destroy_nodes(accelerometer_group);
+}
+
+static int applesmc_create_light_sensor(void)
+{
+ if (!smcreg.num_light_sensors)
+ return 0;
+ return applesmc_create_nodes(light_sensor_group, 1);
+}
+
+static void applesmc_release_light_sensor(void)
+{
+ if (!smcreg.num_light_sensors)
+ return;
+ applesmc_destroy_nodes(light_sensor_group);
+}
+
+static int applesmc_create_key_backlight(void)
+{
+ if (!smcreg.has_key_backlight)
+ return 0;
+ applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
+ if (!applesmc_led_wq)
+ return -ENOMEM;
+ return led_classdev_register(&pdev->dev, &applesmc_backlight);
+}
+
+static void applesmc_release_key_backlight(void)
+{
+ if (!smcreg.has_key_backlight)
+ return;
+ led_classdev_unregister(&applesmc_backlight);
+ destroy_workqueue(applesmc_led_wq);
+}
+
+static int applesmc_dmi_match(const struct dmi_system_id *id)
+{
+ return 1;
+}
+
+/*
+ * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
+ * So we need to put "Apple MacBook Pro" before "Apple MacBook".
+ */
+static __initdata struct dmi_system_id applesmc_whitelist[] = {
+ { applesmc_dmi_match, "Apple MacBook Air", {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
+ },
+ { applesmc_dmi_match, "Apple MacBook Pro", {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
+ },
+ { applesmc_dmi_match, "Apple MacBook", {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
+ },
+ { applesmc_dmi_match, "Apple Macmini", {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
+ },
+ { applesmc_dmi_match, "Apple MacPro", {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
+ },
+ { applesmc_dmi_match, "Apple iMac", {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
+ },
+ { .ident = NULL }
+};
+
+static int __init applesmc_init(void)
+{
+ int ret;
+
+ if (!dmi_check_system(applesmc_whitelist)) {
+ pr_warn("supported laptop not found!\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
+ "applesmc")) {
+ ret = -ENXIO;
+ goto out;
+ }
+
+ ret = platform_driver_register(&applesmc_driver);
+ if (ret)
+ goto out_region;
+
+ pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
+ NULL, 0);
+ if (IS_ERR(pdev)) {
+ ret = PTR_ERR(pdev);
+ goto out_driver;
+ }
+
+ /* create register cache */
+ ret = applesmc_init_smcreg();
+ if (ret)
+ goto out_device;
+
+ ret = applesmc_create_nodes(info_group, 1);
+ if (ret)
+ goto out_smcreg;
+
+ ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
+ if (ret)
+ goto out_info;
+
+ ret = applesmc_create_nodes(temp_group, smcreg.index_count);
+ if (ret)
+ goto out_fans;
+
+ ret = applesmc_create_accelerometer();
+ if (ret)
+ goto out_temperature;
+
+ ret = applesmc_create_light_sensor();
+ if (ret)
+ goto out_accelerometer;
+
+ ret = applesmc_create_key_backlight();
+ if (ret)
+ goto out_light_sysfs;
+
+ hwmon_dev = hwmon_device_register(&pdev->dev);
+ if (IS_ERR(hwmon_dev)) {
+ ret = PTR_ERR(hwmon_dev);
+ goto out_light_ledclass;
+ }
+
+ return 0;
+
+out_light_ledclass:
+ applesmc_release_key_backlight();
+out_light_sysfs:
+ applesmc_release_light_sensor();
+out_accelerometer:
+ applesmc_release_accelerometer();
+out_temperature:
+ applesmc_destroy_nodes(temp_group);
+out_fans:
+ applesmc_destroy_nodes(fan_group);
+out_info:
+ applesmc_destroy_nodes(info_group);
+out_smcreg:
+ applesmc_destroy_smcreg();
+out_device:
+ platform_device_unregister(pdev);
+out_driver:
+ platform_driver_unregister(&applesmc_driver);
+out_region:
+ release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
+out:
+ pr_warn("driver init failed (ret=%d)!\n", ret);
+ return ret;
+}
+
+static void __exit applesmc_exit(void)
+{
+ hwmon_device_unregister(hwmon_dev);
+ applesmc_release_key_backlight();
+ applesmc_release_light_sensor();
+ applesmc_release_accelerometer();
+ applesmc_destroy_nodes(temp_group);
+ applesmc_destroy_nodes(fan_group);
+ applesmc_destroy_nodes(info_group);
+ applesmc_destroy_smcreg();
+ platform_device_unregister(pdev);
+ platform_driver_unregister(&applesmc_driver);
+ release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
+}
+
+module_init(applesmc_init);
+module_exit(applesmc_exit);
+
+MODULE_AUTHOR("Nicolas Boichat");
+MODULE_DESCRIPTION("Apple SMC");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);
Code Review / kvmfornfv.git / blobdiff