Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 | /*
* nokia-modem.c
*
* HSI client driver for Nokia N900 modem.
*
* Copyright (C) 2014 Sebastian Reichel <sre@kernel.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 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 St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#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/of_gpio.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 = of_gpio_count(np);
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_kzalloc(dev, gpio_count *
sizeof(struct nokia_modem_gpio), GFP_KERNEL);
if (!modem->gpios) {
dev_err(dev, "Could not allocate memory for gpios\n");
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) {
dev_err(dev, "Could not allocate memory for nokia_modem_device\n");
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", },
{},
};
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");
|