forked from Minki/linux
Merge branch 'i2c-mux/for-next' of https://github.com/peda-r/i2c-mux into i2c/for-4.11
This commit is contained in:
Wolfram Sang
commit
465b2c4ab8
@ -19,7 +19,14 @@ Optional Properties:
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- i2c-mux-idle-disconnect: Boolean; if defined, forces mux to disconnect all
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children in idle state. This is necessary for example, if there are several
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multiplexers on the bus and the devices behind them use same I2C addresses.
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- interrupt-parent: Phandle for the interrupt controller that services
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interrupts for this device.
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- interrupts: Interrupt mapping for IRQ.
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- interrupt-controller: Marks the device node as an interrupt controller.
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- #interrupt-cells : Should be two.
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- first cell is the pin number
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- second cell is used to specify flags.
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See also Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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Example:
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@ -29,6 +36,11 @@ Example:
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#size-cells = <0>;
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reg = <0x74>;
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interrupt-parent = <&ipic>;
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interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
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interrupt-controller;
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#interrupt-cells = <2>;
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i2c@2 {
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#address-cells = <1>;
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#size-cells = <0>;
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@ -41,14 +41,20 @@
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#include <linux/i2c.h>
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#include <linux/i2c-mux.h>
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#include <linux/i2c/pca954x.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#define PCA954X_MAX_NCHANS 8
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#define PCA954X_IRQ_OFFSET 4
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enum pca_type {
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pca_9540,
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pca_9542,
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@ -63,6 +69,7 @@ enum pca_type {
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struct chip_desc {
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u8 nchans;
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u8 enable; /* used for muxes only */
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u8 has_irq;
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enum muxtype {
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pca954x_ismux = 0,
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pca954x_isswi
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@ -75,6 +82,10 @@ struct pca954x {
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u8 last_chan; /* last register value */
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u8 deselect;
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struct i2c_client *client;
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struct irq_domain *irq;
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unsigned int irq_mask;
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spinlock_t lock;
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};
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/* Provide specs for the PCA954x types we know about */
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@ -84,17 +95,26 @@ static const struct chip_desc chips[] = {
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.enable = 0x4,
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.muxtype = pca954x_ismux,
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},
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[pca_9542] = {
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.nchans = 2,
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.enable = 0x4,
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.has_irq = 1,
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.muxtype = pca954x_ismux,
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},
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[pca_9543] = {
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.nchans = 2,
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.has_irq = 1,
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.muxtype = pca954x_isswi,
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},
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[pca_9544] = {
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.nchans = 4,
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.enable = 0x4,
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.has_irq = 1,
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.muxtype = pca954x_ismux,
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},
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[pca_9545] = {
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.nchans = 4,
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.has_irq = 1,
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.muxtype = pca954x_isswi,
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},
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[pca_9547] = {
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@ -110,7 +130,7 @@ static const struct chip_desc chips[] = {
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static const struct i2c_device_id pca954x_id[] = {
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{ "pca9540", pca_9540 },
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{ "pca9542", pca_9540 },
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{ "pca9542", pca_9542 },
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{ "pca9543", pca_9543 },
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{ "pca9544", pca_9544 },
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{ "pca9545", pca_9545 },
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@ -124,7 +144,7 @@ MODULE_DEVICE_TABLE(i2c, pca954x_id);
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id pca954x_acpi_ids[] = {
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{ .id = "PCA9540", .driver_data = pca_9540 },
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{ .id = "PCA9542", .driver_data = pca_9540 },
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{ .id = "PCA9542", .driver_data = pca_9542 },
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{ .id = "PCA9543", .driver_data = pca_9543 },
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{ .id = "PCA9544", .driver_data = pca_9544 },
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{ .id = "PCA9545", .driver_data = pca_9545 },
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@ -218,6 +238,114 @@ static int pca954x_deselect_mux(struct i2c_mux_core *muxc, u32 chan)
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return pca954x_reg_write(muxc->parent, client, data->last_chan);
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}
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static irqreturn_t pca954x_irq_handler(int irq, void *dev_id)
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{
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struct pca954x *data = dev_id;
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unsigned int child_irq;
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int ret, i, handled = 0;
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ret = i2c_smbus_read_byte(data->client);
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if (ret < 0)
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return IRQ_NONE;
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for (i = 0; i < data->chip->nchans; i++) {
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if (ret & BIT(PCA954X_IRQ_OFFSET + i)) {
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child_irq = irq_linear_revmap(data->irq, i);
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handle_nested_irq(child_irq);
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handled++;
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}
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}
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return handled ? IRQ_HANDLED : IRQ_NONE;
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}
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static void pca954x_irq_mask(struct irq_data *idata)
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{
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struct pca954x *data = irq_data_get_irq_chip_data(idata);
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unsigned int pos = idata->hwirq;
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unsigned long flags;
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spin_lock_irqsave(&data->lock, flags);
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data->irq_mask &= ~BIT(pos);
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if (!data->irq_mask)
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disable_irq(data->client->irq);
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spin_unlock_irqrestore(&data->lock, flags);
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}
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static void pca954x_irq_unmask(struct irq_data *idata)
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{
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struct pca954x *data = irq_data_get_irq_chip_data(idata);
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unsigned int pos = idata->hwirq;
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unsigned long flags;
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spin_lock_irqsave(&data->lock, flags);
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if (!data->irq_mask)
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enable_irq(data->client->irq);
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data->irq_mask |= BIT(pos);
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spin_unlock_irqrestore(&data->lock, flags);
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}
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static int pca954x_irq_set_type(struct irq_data *idata, unsigned int type)
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{
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if ((type & IRQ_TYPE_SENSE_MASK) != IRQ_TYPE_LEVEL_LOW)
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return -EINVAL;
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return 0;
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}
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static struct irq_chip pca954x_irq_chip = {
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.name = "i2c-mux-pca954x",
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.irq_mask = pca954x_irq_mask,
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.irq_unmask = pca954x_irq_unmask,
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.irq_set_type = pca954x_irq_set_type,
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};
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static int pca954x_irq_setup(struct i2c_mux_core *muxc)
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{
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struct pca954x *data = i2c_mux_priv(muxc);
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struct i2c_client *client = data->client;
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int c, err, irq;
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if (!data->chip->has_irq || client->irq <= 0)
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return 0;
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spin_lock_init(&data->lock);
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data->irq = irq_domain_add_linear(client->dev.of_node,
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data->chip->nchans,
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&irq_domain_simple_ops, data);
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if (!data->irq)
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return -ENODEV;
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for (c = 0; c < data->chip->nchans; c++) {
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irq = irq_create_mapping(data->irq, c);
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irq_set_chip_data(irq, data);
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irq_set_chip_and_handler(irq, &pca954x_irq_chip,
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handle_simple_irq);
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}
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err = devm_request_threaded_irq(&client->dev, data->client->irq, NULL,
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pca954x_irq_handler,
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IRQF_ONESHOT | IRQF_SHARED,
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"pca954x", data);
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if (err)
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goto err_req_irq;
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disable_irq(data->client->irq);
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return 0;
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err_req_irq:
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for (c = 0; c < data->chip->nchans; c++) {
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irq = irq_find_mapping(data->irq, c);
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irq_dispose_mapping(irq);
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}
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irq_domain_remove(data->irq);
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return err;
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}
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/*
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* I2C init/probing/exit functions
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*/
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@ -282,6 +410,10 @@ static int pca954x_probe(struct i2c_client *client,
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idle_disconnect_dt = of_node &&
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of_property_read_bool(of_node, "i2c-mux-idle-disconnect");
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ret = pca954x_irq_setup(muxc);
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if (ret)
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goto fail_del_adapters;
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/* Now create an adapter for each channel */
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for (num = 0; num < data->chip->nchans; num++) {
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bool idle_disconnect_pd = false;
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@ -307,7 +439,7 @@ static int pca954x_probe(struct i2c_client *client,
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dev_err(&client->dev,
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"failed to register multiplexed adapter"
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" %d as bus %d\n", num, force);
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goto virt_reg_failed;
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goto fail_del_adapters;
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}
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}
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@ -318,7 +450,7 @@ static int pca954x_probe(struct i2c_client *client,
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return 0;
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virt_reg_failed:
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fail_del_adapters:
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i2c_mux_del_adapters(muxc);
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return ret;
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}
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@ -326,6 +458,16 @@ virt_reg_failed:
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static int pca954x_remove(struct i2c_client *client)
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{
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struct i2c_mux_core *muxc = i2c_get_clientdata(client);
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struct pca954x *data = i2c_mux_priv(muxc);
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int c, irq;
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if (data->irq) {
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for (c = 0; c < data->chip->nchans; c++) {
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irq = irq_find_mapping(data->irq, c);
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irq_dispose_mapping(irq);
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}
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irq_domain_remove(data->irq);
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}
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i2c_mux_del_adapters(muxc);
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return 0;
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