summaryrefslogtreecommitdiff
path: root/drivers/w1
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/w1')
-rw-r--r--drivers/w1/masters/ds1wm.c108
-rw-r--r--drivers/w1/masters/ds2482.c12
-rw-r--r--drivers/w1/masters/ds2490.c2
-rw-r--r--drivers/w1/slaves/Kconfig8
-rw-r--r--drivers/w1/slaves/Makefile1
-rw-r--r--drivers/w1/slaves/w1_ds2438.c9
-rw-r--r--drivers/w1/slaves/w1_ds2805.c313
-rw-r--r--drivers/w1/slaves/w1_therm.c164
-rw-r--r--drivers/w1/w1.c22
9 files changed, 592 insertions, 47 deletions
diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c
index fd2e9da27c4b..f661695fb589 100644
--- a/drivers/w1/masters/ds1wm.c
+++ b/drivers/w1/masters/ds1wm.c
@@ -95,7 +95,8 @@ static struct {
struct ds1wm_data {
void __iomem *map;
- int bus_shift; /* # of shifts to calc register offsets */
+ unsigned int bus_shift; /* # of shifts to calc register offsets */
+ bool is_hw_big_endian;
struct platform_device *pdev;
const struct mfd_cell *cell;
int irq;
@@ -115,12 +116,65 @@ struct ds1wm_data {
static inline void ds1wm_write_register(struct ds1wm_data *ds1wm_data, u32 reg,
u8 val)
{
- __raw_writeb(val, ds1wm_data->map + (reg << ds1wm_data->bus_shift));
+ if (ds1wm_data->is_hw_big_endian) {
+ switch (ds1wm_data->bus_shift) {
+ case 0:
+ iowrite8(val, ds1wm_data->map + (reg << 0));
+ break;
+ case 1:
+ iowrite16be((u16)val, ds1wm_data->map + (reg << 1));
+ break;
+ case 2:
+ iowrite32be((u32)val, ds1wm_data->map + (reg << 2));
+ break;
+ }
+ } else {
+ switch (ds1wm_data->bus_shift) {
+ case 0:
+ iowrite8(val, ds1wm_data->map + (reg << 0));
+ break;
+ case 1:
+ iowrite16((u16)val, ds1wm_data->map + (reg << 1));
+ break;
+ case 2:
+ iowrite32((u32)val, ds1wm_data->map + (reg << 2));
+ break;
+ }
+ }
}
static inline u8 ds1wm_read_register(struct ds1wm_data *ds1wm_data, u32 reg)
{
- return __raw_readb(ds1wm_data->map + (reg << ds1wm_data->bus_shift));
+ u32 val = 0;
+
+ if (ds1wm_data->is_hw_big_endian) {
+ switch (ds1wm_data->bus_shift) {
+ case 0:
+ val = ioread8(ds1wm_data->map + (reg << 0));
+ break;
+ case 1:
+ val = ioread16be(ds1wm_data->map + (reg << 1));
+ break;
+ case 2:
+ val = ioread32be(ds1wm_data->map + (reg << 2));
+ break;
+ }
+ } else {
+ switch (ds1wm_data->bus_shift) {
+ case 0:
+ val = ioread8(ds1wm_data->map + (reg << 0));
+ break;
+ case 1:
+ val = ioread16(ds1wm_data->map + (reg << 1));
+ break;
+ case 2:
+ val = ioread32(ds1wm_data->map + (reg << 2));
+ break;
+ }
+ }
+ dev_dbg(&ds1wm_data->pdev->dev,
+ "ds1wm_read_register reg: %d, 32 bit val:%x\n", reg, val);
+ return (u8)val;
}
@@ -455,6 +509,7 @@ static int ds1wm_probe(struct platform_device *pdev)
struct ds1wm_driver_data *plat;
struct resource *res;
int ret;
+ u8 inten;
if (!pdev)
return -ENODEV;
@@ -473,9 +528,6 @@ static int ds1wm_probe(struct platform_device *pdev)
if (!ds1wm_data->map)
return -ENOMEM;
- /* calculate bus shift from mem resource */
- ds1wm_data->bus_shift = resource_size(res) >> 3;
-
ds1wm_data->pdev = pdev;
ds1wm_data->cell = mfd_get_cell(pdev);
if (!ds1wm_data->cell)
@@ -484,6 +536,26 @@ static int ds1wm_probe(struct platform_device *pdev)
if (!plat)
return -ENODEV;
+ /* how many bits to shift register number to get register offset */
+ if (plat->bus_shift > 2) {
+ dev_err(&ds1wm_data->pdev->dev,
+ "illegal bus shift %d, not written",
+ ds1wm_data->bus_shift);
+ return -EINVAL;
+ }
+
+ ds1wm_data->bus_shift = plat->bus_shift;
+ /* make sure resource has space for 8 registers */
+ if ((8 << ds1wm_data->bus_shift) > resource_size(res)) {
+ dev_err(&ds1wm_data->pdev->dev,
+ "memory resource size %d to small, should be %d\n",
+ (int)resource_size(res),
+ 8 << ds1wm_data->bus_shift);
+ return -EINVAL;
+ }
+
+ ds1wm_data->is_hw_big_endian = plat->is_hw_big_endian;
+
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res)
return -ENXIO;
@@ -491,15 +563,30 @@ static int ds1wm_probe(struct platform_device *pdev)
ds1wm_data->int_en_reg_none = (plat->active_high ? DS1WM_INTEN_IAS : 0);
ds1wm_data->reset_recover_delay = plat->reset_recover_delay;
+ /* Mask interrupts, set IAS before claiming interrupt */
+ inten = ds1wm_read_register(ds1wm_data, DS1WM_INT_EN);
+ ds1wm_write_register(ds1wm_data,
+ DS1WM_INT_EN, ds1wm_data->int_en_reg_none);
+
if (res->flags & IORESOURCE_IRQ_HIGHEDGE)
irq_set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_RISING);
if (res->flags & IORESOURCE_IRQ_LOWEDGE)
irq_set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_FALLING);
+ if (res->flags & IORESOURCE_IRQ_HIGHLEVEL)
+ irq_set_irq_type(ds1wm_data->irq, IRQ_TYPE_LEVEL_HIGH);
+ if (res->flags & IORESOURCE_IRQ_LOWLEVEL)
+ irq_set_irq_type(ds1wm_data->irq, IRQ_TYPE_LEVEL_LOW);
ret = devm_request_irq(&pdev->dev, ds1wm_data->irq, ds1wm_isr,
IRQF_SHARED, "ds1wm", ds1wm_data);
- if (ret)
+ if (ret) {
+ dev_err(&ds1wm_data->pdev->dev,
+ "devm_request_irq %d failed with errno %d\n",
+ ds1wm_data->irq,
+ ret);
+
return ret;
+ }
ds1wm_up(ds1wm_data);
@@ -509,6 +596,13 @@ static int ds1wm_probe(struct platform_device *pdev)
if (ret)
goto err;
+ dev_dbg(&ds1wm_data->pdev->dev,
+ "ds1wm: probe successful, IAS: %d, rec.delay: %d, clockrate: %d, bus-shift: %d, is Hw Big Endian: %d\n",
+ plat->active_high,
+ plat->reset_recover_delay,
+ plat->clock_rate,
+ ds1wm_data->bus_shift,
+ ds1wm_data->is_hw_big_endian);
return 0;
err:
diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c
index d49681cd29af..5b3e017d9276 100644
--- a/drivers/w1/masters/ds2482.c
+++ b/drivers/w1/masters/ds2482.c
@@ -70,6 +70,8 @@ MODULE_PARM_DESC(active_pullup, "Active pullup (apply to all buses): " \
#define DS2482_REG_CFG_PPM 0x02 /* presence pulse masking */
#define DS2482_REG_CFG_APU 0x01 /* active pull-up */
+/* extra configurations - e.g. 1WS */
+int extra_config;
/**
* Write and verify codes for the CHANNEL_SELECT command (DS2482-800 only).
@@ -403,7 +405,7 @@ static u8 ds2482_w1_reset_bus(void *data)
/* If the chip did reset since detect, re-config it */
if (err & DS2482_REG_STS_RST)
ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG,
- ds2482_calculate_config(0x00));
+ ds2482_calculate_config(extra_config));
}
mutex_unlock(&pdev->access_lock);
@@ -429,8 +431,7 @@ static u8 ds2482_w1_set_pullup(void *data, int delay)
ds2482_wait_1wire_idle(pdev);
/* note: it seems like both SPU and APU have to be set! */
retval = ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG,
- ds2482_calculate_config(DS2482_REG_CFG_SPU |
- DS2482_REG_CFG_APU));
+ ds2482_calculate_config(extra_config|DS2482_REG_CFG_SPU|DS2482_REG_CFG_APU));
ds2482_wait_1wire_idle(pdev);
}
@@ -483,7 +484,7 @@ static int ds2482_probe(struct i2c_client *client,
/* Set all config items to 0 (off) */
ds2482_send_cmd_data(data, DS2482_CMD_WRITE_CONFIG,
- ds2482_calculate_config(0x00));
+ ds2482_calculate_config(extra_config));
mutex_init(&data->access_lock);
@@ -558,4 +559,7 @@ module_i2c_driver(ds2482_driver);
MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
MODULE_DESCRIPTION("DS2482 driver");
+module_param(extra_config, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(extra_config, "Extra Configuration settings 1=APU,2=PPM,3=SPU,8=1WS");
+
MODULE_LICENSE("GPL");
diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c
index 46ccb2fc4f60..c423bdb982bb 100644
--- a/drivers/w1/masters/ds2490.c
+++ b/drivers/w1/masters/ds2490.c
@@ -1088,7 +1088,7 @@ static void ds_disconnect(struct usb_interface *intf)
kfree(dev);
}
-static struct usb_device_id ds_id_table [] = {
+static const struct usb_device_id ds_id_table[] = {
{ USB_DEVICE(0x04fa, 0x2490) },
{ },
};
diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig
index dc4437683956..3c945f9f5f0f 100644
--- a/drivers/w1/slaves/Kconfig
+++ b/drivers/w1/slaves/Kconfig
@@ -65,6 +65,14 @@ config W1_SLAVE_DS2423
Say Y here if you want to use a 1-wire
counter family device (DS2423).
+config W1_SLAVE_DS2805
+ tristate "112-byte EEPROM support (DS28E05)"
+ help
+ Say Y here if you want to use a 1-wire
+ is a 112-byte user-programmable EEPROM is
+ organized as 7 pages of 16 bytes each with 64bit
+ unique number. Requires OverDrive Speed to talk to.
+
config W1_SLAVE_DS2431
tristate "1kb EEPROM family support (DS2431)"
help
diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile
index e59441a5e157..36b22fb2d3a1 100644
--- a/drivers/w1/slaves/Makefile
+++ b/drivers/w1/slaves/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_W1_SLAVE_DS2413) += w1_ds2413.o
obj-$(CONFIG_W1_SLAVE_DS2406) += w1_ds2406.o
obj-$(CONFIG_W1_SLAVE_DS2423) += w1_ds2423.o
obj-$(CONFIG_W1_SLAVE_DS2431) += w1_ds2431.o
+obj-$(CONFIG_W1_SLAVE_DS2805) += w1_ds2805.o
obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
obj-$(CONFIG_W1_SLAVE_DS2438) += w1_ds2438.o
obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o
diff --git a/drivers/w1/slaves/w1_ds2438.c b/drivers/w1/slaves/w1_ds2438.c
index 6487fb772a20..bf641a191d07 100644
--- a/drivers/w1/slaves/w1_ds2438.c
+++ b/drivers/w1/slaves/w1_ds2438.c
@@ -51,7 +51,7 @@
#define DS2438_CURRENT_MSB 0x06
#define DS2438_THRESHOLD 0x07
-int w1_ds2438_get_page(struct w1_slave *sl, int pageno, u8 *buf)
+static int w1_ds2438_get_page(struct w1_slave *sl, int pageno, u8 *buf)
{
unsigned int retries = W1_DS2438_RETRIES;
u8 w1_buf[2];
@@ -85,7 +85,7 @@ int w1_ds2438_get_page(struct w1_slave *sl, int pageno, u8 *buf)
return -1;
}
-int w1_ds2438_get_temperature(struct w1_slave *sl, int16_t *temperature)
+static int w1_ds2438_get_temperature(struct w1_slave *sl, int16_t *temperature)
{
unsigned int retries = W1_DS2438_RETRIES;
u8 w1_buf[DS2438_PAGE_SIZE + 1 /*for CRC*/];
@@ -127,7 +127,7 @@ post_unlock:
return ret;
}
-int w1_ds2438_change_config_bit(struct w1_slave *sl, u8 mask, u8 value)
+static int w1_ds2438_change_config_bit(struct w1_slave *sl, u8 mask, u8 value)
{
unsigned int retries = W1_DS2438_RETRIES;
u8 w1_buf[3];
@@ -186,7 +186,8 @@ int w1_ds2438_change_config_bit(struct w1_slave *sl, u8 mask, u8 value)
return -1;
}
-uint16_t w1_ds2438_get_voltage(struct w1_slave *sl, int adc_input, uint16_t *voltage)
+static uint16_t w1_ds2438_get_voltage(struct w1_slave *sl,
+ int adc_input, uint16_t *voltage)
{
unsigned int retries = W1_DS2438_RETRIES;
u8 w1_buf[DS2438_PAGE_SIZE + 1 /*for CRC*/];
diff --git a/drivers/w1/slaves/w1_ds2805.c b/drivers/w1/slaves/w1_ds2805.c
new file mode 100644
index 000000000000..29348d283a65
--- /dev/null
+++ b/drivers/w1/slaves/w1_ds2805.c
@@ -0,0 +1,313 @@
+/*
+ * w1_ds2805 - w1 family 0d (DS28E05) driver
+ *
+ * Copyright (c) 2016 Andrew Worsley amworsley@gmail.com
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+
+#include <linux/w1.h>
+
+#define W1_EEPROM_DS2805 0x0D
+
+#define W1_F0D_EEPROM_SIZE 128
+#define W1_F0D_PAGE_BITS 3
+#define W1_F0D_PAGE_SIZE (1<<W1_F0D_PAGE_BITS)
+#define W1_F0D_PAGE_MASK 0x0F
+
+#define W1_F0D_SCRATCH_BITS 1
+#define W1_F0D_SCRATCH_SIZE (1<<W1_F0D_SCRATCH_BITS)
+#define W1_F0D_SCRATCH_MASK (W1_F0D_SCRATCH_SIZE-1)
+
+#define W1_F0D_READ_EEPROM 0xF0
+#define W1_F0D_WRITE_EEPROM 0x55
+#define W1_F0D_RELEASE 0xFF
+
+#define W1_F0D_CS_OK 0xAA /* Chip Status Ok */
+
+#define W1_F0D_TPROG_MS 16
+
+#define W1_F0D_READ_RETRIES 10
+#define W1_F0D_READ_MAXLEN W1_F0D_EEPROM_SIZE
+
+/*
+ * Check the file size bounds and adjusts count as needed.
+ * This would not be needed if the file size didn't reset to 0 after a write.
+ */
+static inline size_t w1_f0d_fix_count(loff_t off, size_t count, size_t size)
+{
+ if (off > size)
+ return 0;
+
+ if ((off + count) > size)
+ return size - off;
+
+ return count;
+}
+
+/*
+ * Read a block from W1 ROM two times and compares the results.
+ * If they are equal they are returned, otherwise the read
+ * is repeated W1_F0D_READ_RETRIES times.
+ *
+ * count must not exceed W1_F0D_READ_MAXLEN.
+ */
+static int w1_f0d_readblock(struct w1_slave *sl, int off, int count, char *buf)
+{
+ u8 wrbuf[3];
+ u8 cmp[W1_F0D_READ_MAXLEN];
+ int tries = W1_F0D_READ_RETRIES;
+
+ do {
+ wrbuf[0] = W1_F0D_READ_EEPROM;
+ wrbuf[1] = off & 0x7f;
+ wrbuf[2] = 0;
+
+ if (w1_reset_select_slave(sl))
+ return -1;
+
+ w1_write_block(sl->master, wrbuf, sizeof(wrbuf));
+ w1_read_block(sl->master, buf, count);
+
+ if (w1_reset_select_slave(sl))
+ return -1;
+
+ w1_write_block(sl->master, wrbuf, sizeof(wrbuf));
+ w1_read_block(sl->master, cmp, count);
+
+ if (!memcmp(cmp, buf, count))
+ return 0;
+ } while (--tries);
+
+ dev_err(&sl->dev, "proof reading failed %d times\n",
+ W1_F0D_READ_RETRIES);
+
+ return -1;
+}
+
+static ssize_t w1_f0d_read_bin(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct w1_slave *sl = kobj_to_w1_slave(kobj);
+ int todo = count;
+
+ count = w1_f0d_fix_count(off, count, W1_F0D_EEPROM_SIZE);
+ if (count == 0)
+ return 0;
+
+ mutex_lock(&sl->master->mutex);
+
+ /* read directly from the EEPROM in chunks of W1_F0D_READ_MAXLEN */
+ while (todo > 0) {
+ int block_read;
+
+ if (todo >= W1_F0D_READ_MAXLEN)
+ block_read = W1_F0D_READ_MAXLEN;
+ else
+ block_read = todo;
+
+ if (w1_f0d_readblock(sl, off, block_read, buf) < 0) {
+ count = -EIO;
+ break;
+ }
+
+ todo -= W1_F0D_READ_MAXLEN;
+ buf += W1_F0D_READ_MAXLEN;
+ off += W1_F0D_READ_MAXLEN;
+ }
+
+ mutex_unlock(&sl->master->mutex);
+
+ return count;
+}
+
+/*
+ * Writes to the scratchpad and reads it back for verification.
+ * Then copies the scratchpad to EEPROM.
+ * The data must be aligned at W1_F0D_SCRATCH_SIZE bytes and
+ * must be W1_F0D_SCRATCH_SIZE bytes long.
+ * The master must be locked.
+ *
+ * @param sl The slave structure
+ * @param addr Address for the write
+ * @param len length must be <= (W1_F0D_PAGE_SIZE - (addr & W1_F0D_PAGE_MASK))
+ * @param data The data to write
+ * @return 0=Success -1=failure
+ */
+static int w1_f0d_write(struct w1_slave *sl, int addr, int len, const u8 *data)
+{
+ int tries = W1_F0D_READ_RETRIES;
+ u8 wrbuf[3];
+ u8 rdbuf[W1_F0D_SCRATCH_SIZE];
+ u8 cs;
+
+ if ((addr & 1) || (len != 2)) {
+ dev_err(&sl->dev, "%s: bad addr/len - addr=%#x len=%d\n",
+ __func__, addr, len);
+ return -1;
+ }
+
+retry:
+
+ /* Write the data to the scratchpad */
+ if (w1_reset_select_slave(sl))
+ return -1;
+
+ wrbuf[0] = W1_F0D_WRITE_EEPROM;
+ wrbuf[1] = addr & 0xff;
+ wrbuf[2] = 0xff; /* ?? from Example */
+
+ w1_write_block(sl->master, wrbuf, sizeof(wrbuf));
+ w1_write_block(sl->master, data, len);
+
+ w1_read_block(sl->master, rdbuf, sizeof(rdbuf));
+ /* Compare what was read against the data written */
+ if ((rdbuf[0] != data[0]) || (rdbuf[1] != data[1])) {
+
+ if (--tries)
+ goto retry;
+
+ dev_err(&sl->dev,
+ "could not write to eeprom, scratchpad compare failed %d times\n",
+ W1_F0D_READ_RETRIES);
+ pr_info("%s: rdbuf = %#x %#x data = %#x %#x\n",
+ __func__, rdbuf[0], rdbuf[1], data[0], data[1]);
+
+ return -1;
+ }
+
+ /* Trigger write out to EEPROM */
+ w1_write_8(sl->master, W1_F0D_RELEASE);
+
+ /* Sleep for tprog ms to wait for the write to complete */
+ msleep(W1_F0D_TPROG_MS);
+
+ /* Check CS (Command Status) == 0xAA ? */
+ cs = w1_read_8(sl->master);
+ if (cs != W1_F0D_CS_OK) {
+ dev_err(&sl->dev, "save to eeprom failed = CS=%#x\n", cs);
+ return -1;
+ }
+
+ return 0;
+}
+
+static ssize_t w1_f0d_write_bin(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct w1_slave *sl = kobj_to_w1_slave(kobj);
+ int addr, len;
+ int copy;
+
+ count = w1_f0d_fix_count(off, count, W1_F0D_EEPROM_SIZE);
+ if (count == 0)
+ return 0;
+
+ mutex_lock(&sl->master->mutex);
+
+ /* Can only write data in blocks of the size of the scratchpad */
+ addr = off;
+ len = count;
+ while (len > 0) {
+
+ /* if len too short or addr not aligned */
+ if (len < W1_F0D_SCRATCH_SIZE || addr & W1_F0D_SCRATCH_MASK) {
+ char tmp[W1_F0D_SCRATCH_SIZE];
+
+ /* read the block and update the parts to be written */
+ if (w1_f0d_readblock(sl, addr & ~W1_F0D_SCRATCH_MASK,
+ W1_F0D_SCRATCH_SIZE, tmp)) {
+ count = -EIO;
+ goto out_up;
+ }
+
+ /* copy at most to the boundary of the PAGE or len */
+ copy = W1_F0D_SCRATCH_SIZE -
+ (addr & W1_F0D_SCRATCH_MASK);
+
+ if (copy > len)
+ copy = len;
+
+ memcpy(&tmp[addr & W1_F0D_SCRATCH_MASK], buf, copy);
+ if (w1_f0d_write(sl, addr & ~W1_F0D_SCRATCH_MASK,
+ W1_F0D_SCRATCH_SIZE, tmp) < 0) {
+ count = -EIO;
+ goto out_up;
+ }
+ } else {
+
+ copy = W1_F0D_SCRATCH_SIZE;
+ if (w1_f0d_write(sl, addr, copy, buf) < 0) {
+ count = -EIO;
+ goto out_up;
+ }
+ }
+ buf += copy;
+ addr += copy;
+ len -= copy;
+ }
+
+out_up:
+ mutex_unlock(&sl->master->mutex);
+
+ return count;
+}
+
+static struct bin_attribute w1_f0d_bin_attr = {
+ .attr = {
+ .name = "eeprom",
+ .mode = S_IRUGO | S_IWUSR,
+ },
+ .size = W1_F0D_EEPROM_SIZE,
+ .read = w1_f0d_read_bin,
+ .write = w1_f0d_write_bin,
+};
+
+static int w1_f0d_add_slave(struct w1_slave *sl)
+{
+ return sysfs_create_bin_file(&sl->dev.kobj, &w1_f0d_bin_attr);
+}
+
+static void w1_f0d_remove_slave(struct w1_slave *sl)
+{
+ sysfs_remove_bin_file(&sl->dev.kobj, &w1_f0d_bin_attr);
+}
+
+static struct w1_family_ops w1_f0d_fops = {
+ .add_slave = w1_f0d_add_slave,
+ .remove_slave = w1_f0d_remove_slave,
+};
+
+static struct w1_family w1_family_2d = {
+ .fid = W1_EEPROM_DS2805,
+ .fops = &w1_f0d_fops,
+};
+
+static int __init w1_f0d_init(void)
+{
+ pr_info("%s()\n", __func__);
+ return w1_register_family(&w1_family_2d);
+}
+
+static void __exit w1_f0d_fini(void)
+{
+ pr_info("%s()\n", __func__);
+ w1_unregister_family(&w1_family_2d);
+}
+
+module_init(w1_f0d_init);
+module_exit(w1_f0d_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Andrew Worsley amworsley@gmail.com");
+MODULE_DESCRIPTION("w1 family 0d driver for DS2805, 1kb EEPROM");
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index cb3fc3c6b0d1..259525c3382a 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -29,6 +29,7 @@
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/delay.h>
+#include <linux/hwmon.h>
#include <linux/w1.h>
@@ -59,6 +60,12 @@ struct w1_therm_family_data {
atomic_t refcnt;
};
+struct therm_info {
+ u8 rom[9];
+ u8 crc;
+ u8 verdict;
+};
+
/* return the address of the refcnt in the family data */
#define THERM_REFCNT(family_data) \
(&((struct w1_therm_family_data *)family_data)->refcnt)
@@ -107,19 +114,72 @@ static struct attribute *w1_ds28ea00_attrs[] = {
&dev_attr_w1_seq.attr,
NULL,
};
+
ATTRIBUTE_GROUPS(w1_therm);
ATTRIBUTE_GROUPS(w1_ds28ea00);
+#if IS_REACHABLE(CONFIG_HWMON)
+static int w1_read_temp(struct device *dev, u32 attr, int channel,
+ long *val);
+
+static umode_t w1_is_visible(const void *_data, enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ return attr == hwmon_temp_input ? 0444 : 0;
+}
+
+static int w1_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ switch (type) {
+ case hwmon_temp:
+ return w1_read_temp(dev, attr, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static const u32 w1_temp_config[] = {
+ HWMON_T_INPUT,
+ 0
+};
+
+static const struct hwmon_channel_info w1_temp = {
+ .type = hwmon_temp,
+ .config = w1_temp_config,
+};
+
+static const struct hwmon_channel_info *w1_info[] = {
+ &w1_temp,
+ NULL
+};
+
+static const struct hwmon_ops w1_hwmon_ops = {
+ .is_visible = w1_is_visible,
+ .read = w1_read,
+};
+
+static const struct hwmon_chip_info w1_chip_info = {
+ .ops = &w1_hwmon_ops,
+ .info = w1_info,
+};
+#define W1_CHIPINFO (&w1_chip_info)
+#else
+#define W1_CHIPINFO NULL
+#endif
+
static struct w1_family_ops w1_therm_fops = {
.add_slave = w1_therm_add_slave,
.remove_slave = w1_therm_remove_slave,
.groups = w1_therm_groups,
+ .chip_info = W1_CHIPINFO,
};
static struct w1_family_ops w1_ds28ea00_fops = {
.add_slave = w1_therm_add_slave,
.remove_slave = w1_therm_remove_slave,
.groups = w1_ds28ea00_groups,
+ .chip_info = W1_CHIPINFO,
};
static struct w1_family w1_therm_family_DS18S20 = {
@@ -422,33 +482,31 @@ static ssize_t w1_slave_store(struct device *device,
return ret ? : size;
}
-static ssize_t w1_slave_show(struct device *device,
- struct device_attribute *attr, char *buf)
+static ssize_t read_therm(struct device *device,
+ struct w1_slave *sl, struct therm_info *info)
{
- struct w1_slave *sl = dev_to_w1_slave(device);
struct w1_master *dev = sl->master;
- u8 rom[9], crc, verdict, external_power;
- int i, ret, max_trying = 10;
- ssize_t c = PAGE_SIZE;
+ u8 external_power;
+ int ret, max_trying = 10;
u8 *family_data = sl->family_data;
ret = mutex_lock_interruptible(&dev->bus_mutex);
if (ret != 0)
- goto post_unlock;
+ goto error;
- if (!sl->family_data) {
+ if (!family_data) {
ret = -ENODEV;
- goto pre_unlock;
+ goto mt_unlock;
}
/* prevent the slave from going away in sleep */
atomic_inc(THERM_REFCNT(family_data));
- memset(rom, 0, sizeof(rom));
+ memset(info->rom, 0, sizeof(info->rom));
while (max_trying--) {
- verdict = 0;
- crc = 0;
+ info->verdict = 0;
+ info->crc = 0;
if (!w1_reset_select_slave(sl)) {
int count = 0;
@@ -474,47 +532,69 @@ static ssize_t w1_slave_show(struct device *device,
sleep_rem = msleep_interruptible(tm);
if (sleep_rem != 0) {
ret = -EINTR;
- goto post_unlock;
+ goto dec_refcnt;
}
ret = mutex_lock_interruptible(&dev->bus_mutex);
if (ret != 0)
- goto post_unlock;
+ goto dec_refcnt;
} else if (!w1_strong_pullup) {
sleep_rem = msleep_interruptible(tm);
if (sleep_rem != 0) {
ret = -EINTR;
- goto pre_unlock;
+ goto dec_refcnt;
}
}
if (!w1_reset_select_slave(sl)) {
w1_write_8(dev, W1_READ_SCRATCHPAD);
- count = w1_read_block(dev, rom, 9);
+ count = w1_read_block(dev, info->rom, 9);
if (count != 9) {
dev_warn(device, "w1_read_block() "
"returned %u instead of 9.\n",
count);
}
- crc = w1_calc_crc8(rom, 8);
+ info->crc = w1_calc_crc8(info->rom, 8);
- if (rom[8] == crc)
- verdict = 1;
+ if (info->rom[8] == info->crc)
+ info->verdict = 1;
}
}
- if (verdict)
+ if (info->verdict)
break;
}
+dec_refcnt:
+ atomic_dec(THERM_REFCNT(family_data));
+mt_unlock:
+ mutex_unlock(&dev->bus_mutex);
+error:
+ return ret;
+}
+
+static ssize_t w1_slave_show(struct device *device,
+ struct device_attribute *attr, char *buf)
+{
+ struct w1_slave *sl = dev_to_w1_slave(device);
+ struct therm_info info;
+ u8 *family_data = sl->family_data;
+ int ret, i;
+ ssize_t c = PAGE_SIZE;
+ u8 fid = sl->family->fid;
+
+ ret = read_therm(device, sl, &info);
+ if (ret)
+ return ret;
+
for (i = 0; i < 9; ++i)
- c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", rom[i]);
+ c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", info.rom[i]);
c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n",
- crc, (verdict) ? "YES" : "NO");
- if (verdict)
- memcpy(family_data, rom, sizeof(rom));
+ info.crc, (info.verdict) ? "YES" : "NO");
+ if (info.verdict)
+ memcpy(family_data, info.rom, sizeof(info.rom));
else
dev_warn(device, "Read failed CRC check\n");
@@ -523,16 +603,42 @@ static ssize_t w1_slave_show(struct device *device,
((u8 *)family_data)[i]);
c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n",
- w1_convert_temp(rom, sl->family->fid));
+ w1_convert_temp(info.rom, fid));
ret = PAGE_SIZE - c;
+ return ret;
+}
-pre_unlock:
- mutex_unlock(&dev->bus_mutex);
+#if IS_REACHABLE(CONFIG_HWMON)
+static int w1_read_temp(struct device *device, u32 attr, int channel,
+ long *val)
+{
+ struct w1_slave *sl = dev_get_drvdata(device);
+ struct therm_info info;
+ u8 fid = sl->family->fid;
+ int ret;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ ret = read_therm(device, sl, &info);
+ if (ret)
+ return ret;
+
+ if (!info.verdict) {
+ ret = -EIO;
+ return ret;
+ }
+
+ *val = w1_convert_temp(info.rom, fid);
+ ret = 0;
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
-post_unlock:
- atomic_dec(THERM_REFCNT(family_data));
return ret;
}
+#endif
#define W1_42_CHAIN 0x99
#define W1_42_CHAIN_OFF 0x3C
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 74471e7aa5cc..0c2a5a8327bd 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -25,6 +25,7 @@
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
+#include <linux/hwmon.h>
#include <linux/atomic.h>
@@ -568,7 +569,7 @@ static struct attribute *w1_master_default_attrs[] = {
NULL
};
-static struct attribute_group w1_master_defattr_group = {
+static const struct attribute_group w1_master_defattr_group = {
.attrs = w1_master_default_attrs,
};
@@ -649,9 +650,24 @@ static int w1_family_notify(unsigned long action, struct w1_slave *sl)
return err;
}
}
-
+ if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info) {
+ struct device *hwmon
+ = hwmon_device_register_with_info(&sl->dev,
+ "w1_slave_temp", sl,
+ fops->chip_info,
+ NULL);
+ if (IS_ERR(hwmon)) {
+ dev_warn(&sl->dev,
+ "could not create hwmon device\n");
+ } else {
+ sl->hwmon = hwmon;
+ }
+ }
break;
case BUS_NOTIFY_DEL_DEVICE:
+ if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info &&
+ sl->hwmon)
+ hwmon_device_unregister(sl->hwmon);
if (fops->remove_slave)
sl->family->fops->remove_slave(sl);
if (fops->groups)
@@ -729,6 +745,8 @@ int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
atomic_set(&sl->refcnt, 1);
atomic_inc(&sl->master->refcnt);
dev->slave_count++;
+ dev_info(&dev->dev, "Attaching one wire slave %02x.%012llx crc %02x\n",
+ rn->family, (unsigned long long)rn->id, rn->crc);
/* slave modules need to be loaded in a context with unlocked mutex */
mutex_unlock(&dev->mutex);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 02:35:19 +0000