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authorWolfram Sang <wsa@the-dreams.de>2019-05-03 15:20:04 +0200
committerWolfram Sang <wsa@the-dreams.de>2019-05-03 15:20:58 +0200
commitd00afd5ede1c29a6dc59be2d7fb7d6ef28eb85c5 (patch)
treee194b1968e54380a6654abf7d3a037ca0a010280 /drivers/i2c/muxes
parentMerge tag 'at24-v5.2-updates-for-wolfram' of git://git.kernel.org/pub/scm/lin... (diff)
parenti2c: mux: demux-pinctrl: use struct_size() in devm_kzalloc() (diff)
downloadlinux-d00afd5ede1c29a6dc59be2d7fb7d6ef28eb85c5.tar.xz
linux-d00afd5ede1c29a6dc59be2d7fb7d6ef28eb85c5.zip
Merge branch 'i2c-mux/for-next' of https://github.com/peda-r/i2c-mux into i2c/for-5.2
Mainly some pca954x work, i.e. removal of unused platform data support and added support for sysfs interface for manipulating/examining the idle state. And then a mechanical cocci-style patch.
Diffstat (limited to 'drivers/i2c/muxes')
-rw-r--r--drivers/i2c/muxes/i2c-demux-pinctrl.c4
-rw-r--r--drivers/i2c/muxes/i2c-mux-pca9541.c8
-rw-r--r--drivers/i2c/muxes/i2c-mux-pca954x.c106
3 files changed, 82 insertions, 36 deletions
diff --git a/drivers/i2c/muxes/i2c-demux-pinctrl.c b/drivers/i2c/muxes/i2c-demux-pinctrl.c
index d50454c565ee..4eecffc26527 100644
--- a/drivers/i2c/muxes/i2c-demux-pinctrl.c
+++ b/drivers/i2c/muxes/i2c-demux-pinctrl.c
@@ -221,8 +221,8 @@ static int i2c_demux_pinctrl_probe(struct platform_device *pdev)
return -EINVAL;
}
- priv = devm_kzalloc(&pdev->dev, sizeof(*priv)
- + num_chan * sizeof(struct i2c_demux_pinctrl_chan), GFP_KERNEL);
+ priv = devm_kzalloc(&pdev->dev, struct_size(priv, chan, num_chan),
+ GFP_KERNEL);
props = devm_kcalloc(&pdev->dev, num_chan, sizeof(*props), GFP_KERNEL);
diff --git a/drivers/i2c/muxes/i2c-mux-pca9541.c b/drivers/i2c/muxes/i2c-mux-pca9541.c
index 9e75d6b9140b..50e1fb4aedf5 100644
--- a/drivers/i2c/muxes/i2c-mux-pca9541.c
+++ b/drivers/i2c/muxes/i2c-mux-pca9541.c
@@ -22,7 +22,6 @@
#include <linux/i2c-mux.h>
#include <linux/jiffies.h>
#include <linux/module.h>
-#include <linux/platform_data/pca954x.h>
#include <linux/slab.h>
/*
@@ -287,10 +286,8 @@ static int pca9541_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adap = client->adapter;
- struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev);
struct i2c_mux_core *muxc;
struct pca9541 *data;
- int force;
int ret;
if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE_DATA))
@@ -306,9 +303,6 @@ static int pca9541_probe(struct i2c_client *client,
/* Create mux adapter */
- force = 0;
- if (pdata)
- force = pdata->modes[0].adap_id;
muxc = i2c_mux_alloc(adap, &client->dev, 1, sizeof(*data),
I2C_MUX_ARBITRATOR,
pca9541_select_chan, pca9541_release_chan);
@@ -320,7 +314,7 @@ static int pca9541_probe(struct i2c_client *client,
i2c_set_clientdata(client, muxc);
- ret = i2c_mux_add_adapter(muxc, force, 0, 0);
+ ret = i2c_mux_add_adapter(muxc, 0, 0, 0);
if (ret)
return ret;
diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index bfabf985e830..923aa3a5a3dc 100644
--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
@@ -46,10 +46,10 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
-#include <linux/platform_data/pca954x.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
+#include <dt-bindings/mux/mux.h>
#define PCA954X_MAX_NCHANS 8
@@ -85,7 +85,9 @@ struct pca954x {
const struct chip_desc *chip;
u8 last_chan; /* last register value */
- u8 deselect;
+ /* MUX_IDLE_AS_IS, MUX_IDLE_DISCONNECT or >= 0 for channel */
+ s8 idle_state;
+
struct i2c_client *client;
struct irq_domain *irq;
@@ -254,15 +256,71 @@ static int pca954x_deselect_mux(struct i2c_mux_core *muxc, u32 chan)
{
struct pca954x *data = i2c_mux_priv(muxc);
struct i2c_client *client = data->client;
+ s8 idle_state;
+
+ idle_state = READ_ONCE(data->idle_state);
+ if (idle_state >= 0)
+ /* Set the mux back to a predetermined channel */
+ return pca954x_select_chan(muxc, idle_state);
+
+ if (idle_state == MUX_IDLE_DISCONNECT) {
+ /* Deselect active channel */
+ data->last_chan = 0;
+ return pca954x_reg_write(muxc->parent, client,
+ data->last_chan);
+ }
- if (!(data->deselect & (1 << chan)))
- return 0;
+ /* otherwise leave as-is */
- /* Deselect active channel */
- data->last_chan = 0;
- return pca954x_reg_write(muxc->parent, client, data->last_chan);
+ return 0;
+}
+
+static ssize_t idle_state_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_mux_core *muxc = i2c_get_clientdata(client);
+ struct pca954x *data = i2c_mux_priv(muxc);
+
+ return sprintf(buf, "%d\n", READ_ONCE(data->idle_state));
}
+static ssize_t idle_state_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_mux_core *muxc = i2c_get_clientdata(client);
+ struct pca954x *data = i2c_mux_priv(muxc);
+ int val;
+ int ret;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret < 0)
+ return ret;
+
+ if (val != MUX_IDLE_AS_IS && val != MUX_IDLE_DISCONNECT &&
+ (val < 0 || val >= data->chip->nchans))
+ return -EINVAL;
+
+ i2c_lock_bus(muxc->parent, I2C_LOCK_SEGMENT);
+
+ WRITE_ONCE(data->idle_state, val);
+ /*
+ * Set the mux into a state consistent with the new
+ * idle_state.
+ */
+ if (data->last_chan || val != MUX_IDLE_DISCONNECT)
+ ret = pca954x_deselect_mux(muxc, 0);
+
+ i2c_unlock_bus(muxc->parent, I2C_LOCK_SEGMENT);
+
+ return ret < 0 ? ret : count;
+}
+
+static DEVICE_ATTR_RW(idle_state);
+
static irqreturn_t pca954x_irq_handler(int irq, void *dev_id)
{
struct pca954x *data = dev_id;
@@ -329,8 +387,11 @@ static int pca954x_irq_setup(struct i2c_mux_core *muxc)
static void pca954x_cleanup(struct i2c_mux_core *muxc)
{
struct pca954x *data = i2c_mux_priv(muxc);
+ struct i2c_client *client = data->client;
int c, irq;
+ device_remove_file(&client->dev, &dev_attr_idle_state);
+
if (data->irq) {
for (c = 0; c < data->chip->nchans; c++) {
irq = irq_find_mapping(data->irq, c);
@@ -348,14 +409,13 @@ static int pca954x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adap = client->adapter;
- struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev);
struct device *dev = &client->dev;
struct device_node *np = dev->of_node;
bool idle_disconnect_dt;
struct gpio_desc *gpio;
- int num, force, class;
struct i2c_mux_core *muxc;
struct pca954x *data;
+ int num;
int ret;
if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE))
@@ -412,9 +472,12 @@ static int pca954x_probe(struct i2c_client *client,
}
data->last_chan = 0; /* force the first selection */
+ data->idle_state = MUX_IDLE_AS_IS;
idle_disconnect_dt = np &&
of_property_read_bool(np, "i2c-mux-idle-disconnect");
+ if (idle_disconnect_dt)
+ data->idle_state = MUX_IDLE_DISCONNECT;
ret = pca954x_irq_setup(muxc);
if (ret)
@@ -422,24 +485,7 @@ static int pca954x_probe(struct i2c_client *client,
/* Now create an adapter for each channel */
for (num = 0; num < data->chip->nchans; num++) {
- bool idle_disconnect_pd = false;
-
- force = 0; /* dynamic adap number */
- class = 0; /* no class by default */
- if (pdata) {
- if (num < pdata->num_modes) {
- /* force static number */
- force = pdata->modes[num].adap_id;
- class = pdata->modes[num].class;
- } else
- /* discard unconfigured channels */
- break;
- idle_disconnect_pd = pdata->modes[num].deselect_on_exit;
- }
- data->deselect |= (idle_disconnect_pd ||
- idle_disconnect_dt) << num;
-
- ret = i2c_mux_add_adapter(muxc, force, num, class);
+ ret = i2c_mux_add_adapter(muxc, 0, num, 0);
if (ret)
goto fail_cleanup;
}
@@ -453,6 +499,12 @@ static int pca954x_probe(struct i2c_client *client,
goto fail_cleanup;
}
+ /*
+ * The attr probably isn't going to be needed in most cases,
+ * so don't fail completely on error.
+ */
+ device_create_file(dev, &dev_attr_idle_state);
+
dev_info(dev, "registered %d multiplexed busses for I2C %s %s\n",
num, data->chip->muxtype == pca954x_ismux
? "mux" : "switch", client->name);