Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011-2012 Avionic Design GmbH |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 9 | #include <linux/gpio/driver.h> |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 10 | #include <linux/i2c.h> |
| 11 | #include <linux/interrupt.h> |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 12 | #include <linux/module.h> |
| 13 | #include <linux/of_irq.h> |
| 14 | #include <linux/seq_file.h> |
| 15 | #include <linux/slab.h> |
| 16 | |
| 17 | #define GPIO_DDR(gpio) (0x00 << (gpio)->reg_shift) |
| 18 | #define GPIO_PLR(gpio) (0x01 << (gpio)->reg_shift) |
| 19 | #define GPIO_IER(gpio) (0x02 << (gpio)->reg_shift) |
| 20 | #define GPIO_ISR(gpio) (0x03 << (gpio)->reg_shift) |
| 21 | #define GPIO_PTR(gpio) (0x04 << (gpio)->reg_shift) |
| 22 | |
| 23 | struct adnp { |
| 24 | struct i2c_client *client; |
| 25 | struct gpio_chip gpio; |
| 26 | unsigned int reg_shift; |
| 27 | |
| 28 | struct mutex i2c_lock; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 29 | struct mutex irq_lock; |
| 30 | |
| 31 | u8 *irq_enable; |
| 32 | u8 *irq_level; |
| 33 | u8 *irq_rise; |
| 34 | u8 *irq_fall; |
| 35 | u8 *irq_high; |
| 36 | u8 *irq_low; |
| 37 | }; |
| 38 | |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 39 | static int adnp_read(struct adnp *adnp, unsigned offset, uint8_t *value) |
| 40 | { |
| 41 | int err; |
| 42 | |
| 43 | err = i2c_smbus_read_byte_data(adnp->client, offset); |
| 44 | if (err < 0) { |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 45 | dev_err(adnp->gpio.parent, "%s failed: %d\n", |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 46 | "i2c_smbus_read_byte_data()", err); |
| 47 | return err; |
| 48 | } |
| 49 | |
| 50 | *value = err; |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int adnp_write(struct adnp *adnp, unsigned offset, uint8_t value) |
| 55 | { |
| 56 | int err; |
| 57 | |
| 58 | err = i2c_smbus_write_byte_data(adnp->client, offset, value); |
| 59 | if (err < 0) { |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 60 | dev_err(adnp->gpio.parent, "%s failed: %d\n", |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 61 | "i2c_smbus_write_byte_data()", err); |
| 62 | return err; |
| 63 | } |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | static int adnp_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 69 | { |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 70 | struct adnp *adnp = gpiochip_get_data(chip); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 71 | unsigned int reg = offset >> adnp->reg_shift; |
| 72 | unsigned int pos = offset & 7; |
| 73 | u8 value; |
| 74 | int err; |
| 75 | |
| 76 | err = adnp_read(adnp, GPIO_PLR(adnp) + reg, &value); |
| 77 | if (err < 0) |
| 78 | return err; |
| 79 | |
| 80 | return (value & BIT(pos)) ? 1 : 0; |
| 81 | } |
| 82 | |
| 83 | static void __adnp_gpio_set(struct adnp *adnp, unsigned offset, int value) |
| 84 | { |
| 85 | unsigned int reg = offset >> adnp->reg_shift; |
| 86 | unsigned int pos = offset & 7; |
| 87 | int err; |
| 88 | u8 val; |
| 89 | |
| 90 | err = adnp_read(adnp, GPIO_PLR(adnp) + reg, &val); |
| 91 | if (err < 0) |
| 92 | return; |
| 93 | |
| 94 | if (value) |
| 95 | val |= BIT(pos); |
| 96 | else |
| 97 | val &= ~BIT(pos); |
| 98 | |
| 99 | adnp_write(adnp, GPIO_PLR(adnp) + reg, val); |
| 100 | } |
| 101 | |
| 102 | static void adnp_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 103 | { |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 104 | struct adnp *adnp = gpiochip_get_data(chip); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 105 | |
| 106 | mutex_lock(&adnp->i2c_lock); |
| 107 | __adnp_gpio_set(adnp, offset, value); |
| 108 | mutex_unlock(&adnp->i2c_lock); |
| 109 | } |
| 110 | |
| 111 | static int adnp_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| 112 | { |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 113 | struct adnp *adnp = gpiochip_get_data(chip); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 114 | unsigned int reg = offset >> adnp->reg_shift; |
| 115 | unsigned int pos = offset & 7; |
| 116 | u8 value; |
| 117 | int err; |
| 118 | |
| 119 | mutex_lock(&adnp->i2c_lock); |
| 120 | |
| 121 | err = adnp_read(adnp, GPIO_DDR(adnp) + reg, &value); |
| 122 | if (err < 0) |
| 123 | goto out; |
| 124 | |
| 125 | value &= ~BIT(pos); |
| 126 | |
| 127 | err = adnp_write(adnp, GPIO_DDR(adnp) + reg, value); |
| 128 | if (err < 0) |
| 129 | goto out; |
| 130 | |
| 131 | err = adnp_read(adnp, GPIO_DDR(adnp) + reg, &value); |
| 132 | if (err < 0) |
| 133 | goto out; |
| 134 | |
| 135 | if (err & BIT(pos)) |
| 136 | err = -EACCES; |
| 137 | |
| 138 | err = 0; |
| 139 | |
| 140 | out: |
| 141 | mutex_unlock(&adnp->i2c_lock); |
| 142 | return err; |
| 143 | } |
| 144 | |
| 145 | static int adnp_gpio_direction_output(struct gpio_chip *chip, unsigned offset, |
| 146 | int value) |
| 147 | { |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 148 | struct adnp *adnp = gpiochip_get_data(chip); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 149 | unsigned int reg = offset >> adnp->reg_shift; |
| 150 | unsigned int pos = offset & 7; |
| 151 | int err; |
| 152 | u8 val; |
| 153 | |
| 154 | mutex_lock(&adnp->i2c_lock); |
| 155 | |
| 156 | err = adnp_read(adnp, GPIO_DDR(adnp) + reg, &val); |
| 157 | if (err < 0) |
| 158 | goto out; |
| 159 | |
| 160 | val |= BIT(pos); |
| 161 | |
| 162 | err = adnp_write(adnp, GPIO_DDR(adnp) + reg, val); |
| 163 | if (err < 0) |
| 164 | goto out; |
| 165 | |
| 166 | err = adnp_read(adnp, GPIO_DDR(adnp) + reg, &val); |
| 167 | if (err < 0) |
| 168 | goto out; |
| 169 | |
| 170 | if (!(val & BIT(pos))) { |
| 171 | err = -EPERM; |
| 172 | goto out; |
| 173 | } |
| 174 | |
| 175 | __adnp_gpio_set(adnp, offset, value); |
| 176 | err = 0; |
| 177 | |
| 178 | out: |
| 179 | mutex_unlock(&adnp->i2c_lock); |
| 180 | return err; |
| 181 | } |
| 182 | |
| 183 | static void adnp_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
| 184 | { |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 185 | struct adnp *adnp = gpiochip_get_data(chip); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 186 | unsigned int num_regs = 1 << adnp->reg_shift, i, j; |
| 187 | int err; |
| 188 | |
| 189 | for (i = 0; i < num_regs; i++) { |
| 190 | u8 ddr, plr, ier, isr; |
| 191 | |
| 192 | mutex_lock(&adnp->i2c_lock); |
| 193 | |
| 194 | err = adnp_read(adnp, GPIO_DDR(adnp) + i, &ddr); |
| 195 | if (err < 0) { |
| 196 | mutex_unlock(&adnp->i2c_lock); |
| 197 | return; |
| 198 | } |
| 199 | |
| 200 | err = adnp_read(adnp, GPIO_PLR(adnp) + i, &plr); |
| 201 | if (err < 0) { |
| 202 | mutex_unlock(&adnp->i2c_lock); |
| 203 | return; |
| 204 | } |
| 205 | |
| 206 | err = adnp_read(adnp, GPIO_IER(adnp) + i, &ier); |
| 207 | if (err < 0) { |
| 208 | mutex_unlock(&adnp->i2c_lock); |
| 209 | return; |
| 210 | } |
| 211 | |
| 212 | err = adnp_read(adnp, GPIO_ISR(adnp) + i, &isr); |
| 213 | if (err < 0) { |
| 214 | mutex_unlock(&adnp->i2c_lock); |
| 215 | return; |
| 216 | } |
| 217 | |
| 218 | mutex_unlock(&adnp->i2c_lock); |
| 219 | |
| 220 | for (j = 0; j < 8; j++) { |
| 221 | unsigned int bit = (i << adnp->reg_shift) + j; |
| 222 | const char *direction = "input "; |
| 223 | const char *level = "low "; |
| 224 | const char *interrupt = "disabled"; |
| 225 | const char *pending = ""; |
| 226 | |
| 227 | if (ddr & BIT(j)) |
| 228 | direction = "output"; |
| 229 | |
| 230 | if (plr & BIT(j)) |
| 231 | level = "high"; |
| 232 | |
| 233 | if (ier & BIT(j)) |
| 234 | interrupt = "enabled "; |
| 235 | |
| 236 | if (isr & BIT(j)) |
| 237 | pending = "pending"; |
| 238 | |
| 239 | seq_printf(s, "%2u: %s %s IRQ %s %s\n", bit, |
| 240 | direction, level, interrupt, pending); |
| 241 | } |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | static int adnp_gpio_setup(struct adnp *adnp, unsigned int num_gpios) |
| 246 | { |
| 247 | struct gpio_chip *chip = &adnp->gpio; |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 248 | int err; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 249 | |
| 250 | adnp->reg_shift = get_count_order(num_gpios) - 3; |
| 251 | |
| 252 | chip->direction_input = adnp_gpio_direction_input; |
| 253 | chip->direction_output = adnp_gpio_direction_output; |
| 254 | chip->get = adnp_gpio_get; |
| 255 | chip->set = adnp_gpio_set; |
Linus Walleij | 9fb1f39 | 2013-12-04 14:42:46 +0100 | [diff] [blame] | 256 | chip->can_sleep = true; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 257 | |
| 258 | if (IS_ENABLED(CONFIG_DEBUG_FS)) |
| 259 | chip->dbg_show = adnp_gpio_dbg_show; |
| 260 | |
| 261 | chip->base = -1; |
| 262 | chip->ngpio = num_gpios; |
| 263 | chip->label = adnp->client->name; |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 264 | chip->parent = &adnp->client->dev; |
| 265 | chip->of_node = chip->parent->of_node; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 266 | chip->owner = THIS_MODULE; |
| 267 | |
Laxman Dewangan | daa994b | 2016-02-22 17:43:28 +0530 | [diff] [blame] | 268 | err = devm_gpiochip_add_data(&adnp->client->dev, chip, adnp); |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 269 | if (err) |
| 270 | return err; |
| 271 | |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static irqreturn_t adnp_irq(int irq, void *data) |
| 276 | { |
| 277 | struct adnp *adnp = data; |
| 278 | unsigned int num_regs, i; |
| 279 | |
| 280 | num_regs = 1 << adnp->reg_shift; |
| 281 | |
| 282 | for (i = 0; i < num_regs; i++) { |
| 283 | unsigned int base = i << adnp->reg_shift, bit; |
| 284 | u8 changed, level, isr, ier; |
| 285 | unsigned long pending; |
| 286 | int err; |
| 287 | |
| 288 | mutex_lock(&adnp->i2c_lock); |
| 289 | |
| 290 | err = adnp_read(adnp, GPIO_PLR(adnp) + i, &level); |
| 291 | if (err < 0) { |
| 292 | mutex_unlock(&adnp->i2c_lock); |
| 293 | continue; |
| 294 | } |
| 295 | |
| 296 | err = adnp_read(adnp, GPIO_ISR(adnp) + i, &isr); |
| 297 | if (err < 0) { |
| 298 | mutex_unlock(&adnp->i2c_lock); |
| 299 | continue; |
| 300 | } |
| 301 | |
| 302 | err = adnp_read(adnp, GPIO_IER(adnp) + i, &ier); |
| 303 | if (err < 0) { |
| 304 | mutex_unlock(&adnp->i2c_lock); |
| 305 | continue; |
| 306 | } |
| 307 | |
| 308 | mutex_unlock(&adnp->i2c_lock); |
| 309 | |
| 310 | /* determine pins that changed levels */ |
| 311 | changed = level ^ adnp->irq_level[i]; |
| 312 | |
| 313 | /* compute edge-triggered interrupts */ |
| 314 | pending = changed & ((adnp->irq_fall[i] & ~level) | |
| 315 | (adnp->irq_rise[i] & level)); |
| 316 | |
| 317 | /* add in level-triggered interrupts */ |
| 318 | pending |= (adnp->irq_high[i] & level) | |
| 319 | (adnp->irq_low[i] & ~level); |
| 320 | |
| 321 | /* mask out non-pending and disabled interrupts */ |
| 322 | pending &= isr & ier; |
| 323 | |
| 324 | for_each_set_bit(bit, &pending, 8) { |
Linus Walleij | 472f95b | 2013-10-11 19:10:00 +0200 | [diff] [blame] | 325 | unsigned int child_irq; |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 326 | child_irq = irq_find_mapping(adnp->gpio.irqdomain, |
| 327 | base + bit); |
Linus Walleij | 472f95b | 2013-10-11 19:10:00 +0200 | [diff] [blame] | 328 | handle_nested_irq(child_irq); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 329 | } |
| 330 | } |
| 331 | |
| 332 | return IRQ_HANDLED; |
| 333 | } |
| 334 | |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 335 | static void adnp_irq_mask(struct irq_data *d) |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 336 | { |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 337 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 338 | struct adnp *adnp = gpiochip_get_data(gc); |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 339 | unsigned int reg = d->hwirq >> adnp->reg_shift; |
| 340 | unsigned int pos = d->hwirq & 7; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 341 | |
| 342 | adnp->irq_enable[reg] &= ~BIT(pos); |
| 343 | } |
| 344 | |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 345 | static void adnp_irq_unmask(struct irq_data *d) |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 346 | { |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 347 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 348 | struct adnp *adnp = gpiochip_get_data(gc); |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 349 | unsigned int reg = d->hwirq >> adnp->reg_shift; |
| 350 | unsigned int pos = d->hwirq & 7; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 351 | |
| 352 | adnp->irq_enable[reg] |= BIT(pos); |
| 353 | } |
| 354 | |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 355 | static int adnp_irq_set_type(struct irq_data *d, unsigned int type) |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 356 | { |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 357 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 358 | struct adnp *adnp = gpiochip_get_data(gc); |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 359 | unsigned int reg = d->hwirq >> adnp->reg_shift; |
| 360 | unsigned int pos = d->hwirq & 7; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 361 | |
| 362 | if (type & IRQ_TYPE_EDGE_RISING) |
| 363 | adnp->irq_rise[reg] |= BIT(pos); |
| 364 | else |
| 365 | adnp->irq_rise[reg] &= ~BIT(pos); |
| 366 | |
| 367 | if (type & IRQ_TYPE_EDGE_FALLING) |
| 368 | adnp->irq_fall[reg] |= BIT(pos); |
| 369 | else |
| 370 | adnp->irq_fall[reg] &= ~BIT(pos); |
| 371 | |
| 372 | if (type & IRQ_TYPE_LEVEL_HIGH) |
| 373 | adnp->irq_high[reg] |= BIT(pos); |
| 374 | else |
| 375 | adnp->irq_high[reg] &= ~BIT(pos); |
| 376 | |
| 377 | if (type & IRQ_TYPE_LEVEL_LOW) |
| 378 | adnp->irq_low[reg] |= BIT(pos); |
| 379 | else |
| 380 | adnp->irq_low[reg] &= ~BIT(pos); |
| 381 | |
| 382 | return 0; |
| 383 | } |
| 384 | |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 385 | static void adnp_irq_bus_lock(struct irq_data *d) |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 386 | { |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 387 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 388 | struct adnp *adnp = gpiochip_get_data(gc); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 389 | |
| 390 | mutex_lock(&adnp->irq_lock); |
| 391 | } |
| 392 | |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 393 | static void adnp_irq_bus_unlock(struct irq_data *d) |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 394 | { |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 395 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
Linus Walleij | 1e69c4f | 2015-12-04 14:56:15 +0100 | [diff] [blame] | 396 | struct adnp *adnp = gpiochip_get_data(gc); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 397 | unsigned int num_regs = 1 << adnp->reg_shift, i; |
| 398 | |
| 399 | mutex_lock(&adnp->i2c_lock); |
| 400 | |
| 401 | for (i = 0; i < num_regs; i++) |
| 402 | adnp_write(adnp, GPIO_IER(adnp) + i, adnp->irq_enable[i]); |
| 403 | |
| 404 | mutex_unlock(&adnp->i2c_lock); |
| 405 | mutex_unlock(&adnp->irq_lock); |
| 406 | } |
| 407 | |
| 408 | static struct irq_chip adnp_irq_chip = { |
| 409 | .name = "gpio-adnp", |
| 410 | .irq_mask = adnp_irq_mask, |
| 411 | .irq_unmask = adnp_irq_unmask, |
| 412 | .irq_set_type = adnp_irq_set_type, |
| 413 | .irq_bus_lock = adnp_irq_bus_lock, |
| 414 | .irq_bus_sync_unlock = adnp_irq_bus_unlock, |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 415 | }; |
| 416 | |
| 417 | static int adnp_irq_setup(struct adnp *adnp) |
| 418 | { |
| 419 | unsigned int num_regs = 1 << adnp->reg_shift, i; |
| 420 | struct gpio_chip *chip = &adnp->gpio; |
| 421 | int err; |
| 422 | |
| 423 | mutex_init(&adnp->irq_lock); |
| 424 | |
| 425 | /* |
| 426 | * Allocate memory to keep track of the current level and trigger |
| 427 | * modes of the interrupts. To avoid multiple allocations, a single |
| 428 | * large buffer is allocated and pointers are setup to point at the |
| 429 | * corresponding offsets. For consistency, the layout of the buffer |
| 430 | * is chosen to match the register layout of the hardware in that |
| 431 | * each segment contains the corresponding bits for all interrupts. |
| 432 | */ |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 433 | adnp->irq_enable = devm_kzalloc(chip->parent, num_regs * 6, |
| 434 | GFP_KERNEL); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 435 | if (!adnp->irq_enable) |
| 436 | return -ENOMEM; |
| 437 | |
| 438 | adnp->irq_level = adnp->irq_enable + (num_regs * 1); |
| 439 | adnp->irq_rise = adnp->irq_enable + (num_regs * 2); |
| 440 | adnp->irq_fall = adnp->irq_enable + (num_regs * 3); |
| 441 | adnp->irq_high = adnp->irq_enable + (num_regs * 4); |
| 442 | adnp->irq_low = adnp->irq_enable + (num_regs * 5); |
| 443 | |
| 444 | for (i = 0; i < num_regs; i++) { |
| 445 | /* |
| 446 | * Read the initial level of all pins to allow the emulation |
| 447 | * of edge triggered interrupts. |
| 448 | */ |
| 449 | err = adnp_read(adnp, GPIO_PLR(adnp) + i, &adnp->irq_level[i]); |
| 450 | if (err < 0) |
| 451 | return err; |
| 452 | |
| 453 | /* disable all interrupts */ |
| 454 | err = adnp_write(adnp, GPIO_IER(adnp) + i, 0); |
| 455 | if (err < 0) |
| 456 | return err; |
| 457 | |
| 458 | adnp->irq_enable[i] = 0x00; |
| 459 | } |
| 460 | |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 461 | err = devm_request_threaded_irq(chip->parent, adnp->client->irq, |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 462 | NULL, adnp_irq, |
| 463 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 464 | dev_name(chip->parent), adnp); |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 465 | if (err != 0) { |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 466 | dev_err(chip->parent, "can't request IRQ#%d: %d\n", |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 467 | adnp->client->irq, err); |
Lars Poeschel | 5b21533 | 2013-08-07 17:23:58 +0200 | [diff] [blame] | 468 | return err; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 469 | } |
| 470 | |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 471 | err = gpiochip_irqchip_add(chip, |
| 472 | &adnp_irq_chip, |
| 473 | 0, |
| 474 | handle_simple_irq, |
| 475 | IRQ_TYPE_NONE); |
| 476 | if (err) { |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 477 | dev_err(chip->parent, |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 478 | "could not connect irqchip to gpiochip\n"); |
| 479 | return err; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 480 | } |
| 481 | |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 482 | return 0; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 483 | } |
| 484 | |
Bill Pemberton | 3836309 | 2012-11-19 13:22:34 -0500 | [diff] [blame] | 485 | static int adnp_i2c_probe(struct i2c_client *client, |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 486 | const struct i2c_device_id *id) |
| 487 | { |
| 488 | struct device_node *np = client->dev.of_node; |
| 489 | struct adnp *adnp; |
| 490 | u32 num_gpios; |
| 491 | int err; |
| 492 | |
| 493 | err = of_property_read_u32(np, "nr-gpios", &num_gpios); |
| 494 | if (err < 0) |
| 495 | return err; |
| 496 | |
| 497 | client->irq = irq_of_parse_and_map(np, 0); |
| 498 | if (!client->irq) |
| 499 | return -EPROBE_DEFER; |
| 500 | |
| 501 | adnp = devm_kzalloc(&client->dev, sizeof(*adnp), GFP_KERNEL); |
| 502 | if (!adnp) |
| 503 | return -ENOMEM; |
| 504 | |
| 505 | mutex_init(&adnp->i2c_lock); |
| 506 | adnp->client = client; |
| 507 | |
| 508 | err = adnp_gpio_setup(adnp, num_gpios); |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 509 | if (err) |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 510 | return err; |
| 511 | |
| 512 | if (of_find_property(np, "interrupt-controller", NULL)) { |
| 513 | err = adnp_irq_setup(adnp); |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 514 | if (err) |
| 515 | return err; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 516 | } |
| 517 | |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 518 | i2c_set_clientdata(client, adnp); |
Linus Walleij | 0752e16 | 2014-06-02 15:17:54 +0200 | [diff] [blame] | 519 | |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 520 | return 0; |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 521 | } |
| 522 | |
Bill Pemberton | b5ba78d | 2012-11-19 13:25:05 -0500 | [diff] [blame] | 523 | static const struct i2c_device_id adnp_i2c_id[] = { |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 524 | { "gpio-adnp" }, |
| 525 | { }, |
| 526 | }; |
| 527 | MODULE_DEVICE_TABLE(i2c, adnp_i2c_id); |
| 528 | |
Bill Pemberton | b5ba78d | 2012-11-19 13:25:05 -0500 | [diff] [blame] | 529 | static const struct of_device_id adnp_of_match[] = { |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 530 | { .compatible = "ad,gpio-adnp", }, |
| 531 | { }, |
| 532 | }; |
| 533 | MODULE_DEVICE_TABLE(of, adnp_of_match); |
| 534 | |
| 535 | static struct i2c_driver adnp_i2c_driver = { |
| 536 | .driver = { |
| 537 | .name = "gpio-adnp", |
Sachin Kamat | 83924fb3 | 2013-09-28 17:34:07 +0530 | [diff] [blame] | 538 | .of_match_table = adnp_of_match, |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 539 | }, |
| 540 | .probe = adnp_i2c_probe, |
Thierry Reding | 5e969a4 | 2012-09-18 10:57:10 +0200 | [diff] [blame] | 541 | .id_table = adnp_i2c_id, |
| 542 | }; |
| 543 | module_i2c_driver(adnp_i2c_driver); |
| 544 | |
| 545 | MODULE_DESCRIPTION("Avionic Design N-bit GPIO expander"); |
| 546 | MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>"); |
| 547 | MODULE_LICENSE("GPL"); |