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path: root/drivers/hsi/clients/nokia-modem.c
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-rw-r--r--drivers/hsi/clients/nokia-modem.c298
1 files changed, 298 insertions, 0 deletions
diff --git a/drivers/hsi/clients/nokia-modem.c b/drivers/hsi/clients/nokia-modem.c
new file mode 100644
index 000000000..97ba59e60
--- /dev/null
+++ b/drivers/hsi/clients/nokia-modem.c
@@ -0,0 +1,298 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * nokia-modem.c
+ *
+ * HSI client driver for Nokia N900 modem.
+ *
+ * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org>
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/hsi/hsi.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/hsi/ssi_protocol.h>
+
+static unsigned int pm = 1;
+module_param(pm, int, 0400);
+MODULE_PARM_DESC(pm,
+ "Enable power management (0=disabled, 1=userland based [default])");
+
+struct nokia_modem_gpio {
+ struct gpio_desc *gpio;
+ const char *name;
+};
+
+struct nokia_modem_device {
+ struct tasklet_struct nokia_modem_rst_ind_tasklet;
+ int nokia_modem_rst_ind_irq;
+ struct device *device;
+ struct nokia_modem_gpio *gpios;
+ int gpio_amount;
+ struct hsi_client *ssi_protocol;
+ struct hsi_client *cmt_speech;
+};
+
+static void do_nokia_modem_rst_ind_tasklet(unsigned long data)
+{
+ struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
+
+ if (!modem)
+ return;
+
+ dev_info(modem->device, "CMT rst line change detected\n");
+
+ if (modem->ssi_protocol)
+ ssip_reset_event(modem->ssi_protocol);
+}
+
+static irqreturn_t nokia_modem_rst_ind_isr(int irq, void *data)
+{
+ struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
+
+ tasklet_schedule(&modem->nokia_modem_rst_ind_tasklet);
+
+ return IRQ_HANDLED;
+}
+
+static void nokia_modem_gpio_unexport(struct device *dev)
+{
+ struct nokia_modem_device *modem = dev_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < modem->gpio_amount; i++) {
+ sysfs_remove_link(&dev->kobj, modem->gpios[i].name);
+ gpiod_unexport(modem->gpios[i].gpio);
+ }
+}
+
+static int nokia_modem_gpio_probe(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct nokia_modem_device *modem = dev_get_drvdata(dev);
+ int gpio_count, gpio_name_count, i, err;
+
+ gpio_count = gpiod_count(dev, NULL);
+ if (gpio_count < 0) {
+ dev_err(dev, "missing gpios: %d\n", gpio_count);
+ return gpio_count;
+ }
+
+ gpio_name_count = of_property_count_strings(np, "gpio-names");
+
+ if (gpio_count != gpio_name_count) {
+ dev_err(dev, "number of gpios does not equal number of gpio names\n");
+ return -EINVAL;
+ }
+
+ modem->gpios = devm_kcalloc(dev, gpio_count, sizeof(*modem->gpios),
+ GFP_KERNEL);
+ if (!modem->gpios)
+ return -ENOMEM;
+
+ modem->gpio_amount = gpio_count;
+
+ for (i = 0; i < gpio_count; i++) {
+ modem->gpios[i].gpio = devm_gpiod_get_index(dev, NULL, i,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(modem->gpios[i].gpio)) {
+ dev_err(dev, "Could not get gpio %d\n", i);
+ return PTR_ERR(modem->gpios[i].gpio);
+ }
+
+ err = of_property_read_string_index(np, "gpio-names", i,
+ &(modem->gpios[i].name));
+ if (err) {
+ dev_err(dev, "Could not get gpio name %d\n", i);
+ return err;
+ }
+
+ err = gpiod_export(modem->gpios[i].gpio, 0);
+ if (err)
+ return err;
+
+ err = gpiod_export_link(dev, modem->gpios[i].name,
+ modem->gpios[i].gpio);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int nokia_modem_probe(struct device *dev)
+{
+ struct device_node *np;
+ struct nokia_modem_device *modem;
+ struct hsi_client *cl = to_hsi_client(dev);
+ struct hsi_port *port = hsi_get_port(cl);
+ int irq, pflags, err;
+ struct hsi_board_info ssip;
+ struct hsi_board_info cmtspeech;
+
+ np = dev->of_node;
+ if (!np) {
+ dev_err(dev, "device tree node not found\n");
+ return -ENXIO;
+ }
+
+ modem = devm_kzalloc(dev, sizeof(*modem), GFP_KERNEL);
+ if (!modem)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, modem);
+ modem->device = dev;
+
+ irq = irq_of_parse_and_map(np, 0);
+ if (!irq) {
+ dev_err(dev, "Invalid rst_ind interrupt (%d)\n", irq);
+ return -EINVAL;
+ }
+ modem->nokia_modem_rst_ind_irq = irq;
+ pflags = irq_get_trigger_type(irq);
+
+ tasklet_init(&modem->nokia_modem_rst_ind_tasklet,
+ do_nokia_modem_rst_ind_tasklet, (unsigned long)modem);
+ err = devm_request_irq(dev, irq, nokia_modem_rst_ind_isr,
+ pflags, "modem_rst_ind", modem);
+ if (err < 0) {
+ dev_err(dev, "Request rst_ind irq(%d) failed (flags %d)\n",
+ irq, pflags);
+ return err;
+ }
+ enable_irq_wake(irq);
+
+ if (pm) {
+ err = nokia_modem_gpio_probe(dev);
+ if (err < 0) {
+ dev_err(dev, "Could not probe GPIOs\n");
+ goto error1;
+ }
+ }
+
+ ssip.name = "ssi-protocol";
+ ssip.tx_cfg = cl->tx_cfg;
+ ssip.rx_cfg = cl->rx_cfg;
+ ssip.platform_data = NULL;
+ ssip.archdata = NULL;
+
+ modem->ssi_protocol = hsi_new_client(port, &ssip);
+ if (!modem->ssi_protocol) {
+ dev_err(dev, "Could not register ssi-protocol device\n");
+ err = -ENOMEM;
+ goto error2;
+ }
+
+ err = device_attach(&modem->ssi_protocol->device);
+ if (err == 0) {
+ dev_dbg(dev, "Missing ssi-protocol driver\n");
+ err = -EPROBE_DEFER;
+ goto error3;
+ } else if (err < 0) {
+ dev_err(dev, "Could not load ssi-protocol driver (%d)\n", err);
+ goto error3;
+ }
+
+ cmtspeech.name = "cmt-speech";
+ cmtspeech.tx_cfg = cl->tx_cfg;
+ cmtspeech.rx_cfg = cl->rx_cfg;
+ cmtspeech.platform_data = NULL;
+ cmtspeech.archdata = NULL;
+
+ modem->cmt_speech = hsi_new_client(port, &cmtspeech);
+ if (!modem->cmt_speech) {
+ dev_err(dev, "Could not register cmt-speech device\n");
+ err = -ENOMEM;
+ goto error3;
+ }
+
+ err = device_attach(&modem->cmt_speech->device);
+ if (err == 0) {
+ dev_dbg(dev, "Missing cmt-speech driver\n");
+ err = -EPROBE_DEFER;
+ goto error4;
+ } else if (err < 0) {
+ dev_err(dev, "Could not load cmt-speech driver (%d)\n", err);
+ goto error4;
+ }
+
+ dev_info(dev, "Registered Nokia HSI modem\n");
+
+ return 0;
+
+error4:
+ hsi_remove_client(&modem->cmt_speech->device, NULL);
+error3:
+ hsi_remove_client(&modem->ssi_protocol->device, NULL);
+error2:
+ nokia_modem_gpio_unexport(dev);
+error1:
+ disable_irq_wake(modem->nokia_modem_rst_ind_irq);
+ tasklet_kill(&modem->nokia_modem_rst_ind_tasklet);
+
+ return err;
+}
+
+static int nokia_modem_remove(struct device *dev)
+{
+ struct nokia_modem_device *modem = dev_get_drvdata(dev);
+
+ if (!modem)
+ return 0;
+
+ if (modem->cmt_speech) {
+ hsi_remove_client(&modem->cmt_speech->device, NULL);
+ modem->cmt_speech = NULL;
+ }
+
+ if (modem->ssi_protocol) {
+ hsi_remove_client(&modem->ssi_protocol->device, NULL);
+ modem->ssi_protocol = NULL;
+ }
+
+ nokia_modem_gpio_unexport(dev);
+ dev_set_drvdata(dev, NULL);
+ disable_irq_wake(modem->nokia_modem_rst_ind_irq);
+ tasklet_kill(&modem->nokia_modem_rst_ind_tasklet);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id nokia_modem_of_match[] = {
+ { .compatible = "nokia,n900-modem", },
+ { .compatible = "nokia,n950-modem", },
+ { .compatible = "nokia,n9-modem", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, nokia_modem_of_match);
+#endif
+
+static struct hsi_client_driver nokia_modem_driver = {
+ .driver = {
+ .name = "nokia-modem",
+ .owner = THIS_MODULE,
+ .probe = nokia_modem_probe,
+ .remove = nokia_modem_remove,
+ .of_match_table = of_match_ptr(nokia_modem_of_match),
+ },
+};
+
+static int __init nokia_modem_init(void)
+{
+ return hsi_register_client_driver(&nokia_modem_driver);
+}
+module_init(nokia_modem_init);
+
+static void __exit nokia_modem_exit(void)
+{
+ hsi_unregister_client_driver(&nokia_modem_driver);
+}
+module_exit(nokia_modem_exit);
+
+MODULE_ALIAS("hsi:nokia-modem");
+MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
+MODULE_DESCRIPTION("HSI driver module for Nokia N900 Modem");
+MODULE_LICENSE("GPL");