Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 1 | /* |
Grant Likely | c103de2 | 2011-06-04 18:38:28 -0600 | [diff] [blame] | 2 | * MAX732x I2C Port Expander with 8/16 I/O |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2007 Marvell International Ltd. |
| 5 | * Copyright (C) 2008 Jack Ren <jack.ren@marvell.com> |
| 6 | * Copyright (C) 2008 Eric Miao <eric.miao@marvell.com> |
| 7 | * |
| 8 | * Derived from drivers/gpio/pca953x.c |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; version 2 of the License. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/string.h> |
| 19 | #include <linux/gpio.h> |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/irq.h> |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 22 | #include <linux/i2c.h> |
| 23 | #include <linux/i2c/max732x.h> |
| 24 | |
| 25 | |
| 26 | /* |
| 27 | * Each port of MAX732x (including MAX7319) falls into one of the |
| 28 | * following three types: |
| 29 | * |
| 30 | * - Push Pull Output |
| 31 | * - Input |
| 32 | * - Open Drain I/O |
| 33 | * |
| 34 | * designated by 'O', 'I' and 'P' individually according to MAXIM's |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 35 | * datasheets. 'I' and 'P' ports are interrupt capables, some with |
| 36 | * a dedicated interrupt mask. |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 37 | * |
| 38 | * There are two groups of I/O ports, each group usually includes |
| 39 | * up to 8 I/O ports, and is accessed by a specific I2C address: |
| 40 | * |
| 41 | * - Group A : by I2C address 0b'110xxxx |
| 42 | * - Group B : by I2C address 0b'101xxxx |
| 43 | * |
| 44 | * where 'xxxx' is decided by the connections of pin AD2/AD0. The |
| 45 | * address used also affects the initial state of output signals. |
| 46 | * |
| 47 | * Within each group of ports, there are five known combinations of |
| 48 | * I/O ports: 4I4O, 4P4O, 8I, 8P, 8O, see the definitions below for |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 49 | * the detailed organization of these ports. Only Goup A is interrupt |
| 50 | * capable. |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 51 | * |
| 52 | * GPIO numbers start from 'gpio_base + 0' to 'gpio_base + 8/16', |
| 53 | * and GPIOs from GROUP_A are numbered before those from GROUP_B |
| 54 | * (if there are two groups). |
| 55 | * |
| 56 | * NOTE: MAX7328/MAX7329 are drop-in replacements for PCF8574/a, so |
| 57 | * they are not supported by this driver. |
| 58 | */ |
| 59 | |
| 60 | #define PORT_NONE 0x0 /* '/' No Port */ |
| 61 | #define PORT_OUTPUT 0x1 /* 'O' Push-Pull, Output Only */ |
| 62 | #define PORT_INPUT 0x2 /* 'I' Input Only */ |
| 63 | #define PORT_OPENDRAIN 0x3 /* 'P' Open-Drain, I/O */ |
| 64 | |
| 65 | #define IO_4I4O 0x5AA5 /* O7 O6 I5 I4 I3 I2 O1 O0 */ |
| 66 | #define IO_4P4O 0x5FF5 /* O7 O6 P5 P4 P3 P2 O1 O0 */ |
| 67 | #define IO_8I 0xAAAA /* I7 I6 I5 I4 I3 I2 I1 I0 */ |
| 68 | #define IO_8P 0xFFFF /* P7 P6 P5 P4 P3 P2 P1 P0 */ |
| 69 | #define IO_8O 0x5555 /* O7 O6 O5 O4 O3 O2 O1 O0 */ |
| 70 | |
| 71 | #define GROUP_A(x) ((x) & 0xffff) /* I2C Addr: 0b'110xxxx */ |
| 72 | #define GROUP_B(x) ((x) << 16) /* I2C Addr: 0b'101xxxx */ |
| 73 | |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 74 | #define INT_NONE 0x0 /* No interrupt capability */ |
| 75 | #define INT_NO_MASK 0x1 /* Has interrupts, no mask */ |
| 76 | #define INT_INDEP_MASK 0x2 /* Has interrupts, independent mask */ |
| 77 | #define INT_MERGED_MASK 0x3 /* Has interrupts, merged mask */ |
| 78 | |
| 79 | #define INT_CAPS(x) (((uint64_t)(x)) << 32) |
| 80 | |
| 81 | enum { |
| 82 | MAX7319, |
| 83 | MAX7320, |
| 84 | MAX7321, |
| 85 | MAX7322, |
| 86 | MAX7323, |
| 87 | MAX7324, |
| 88 | MAX7325, |
| 89 | MAX7326, |
| 90 | MAX7327, |
| 91 | }; |
| 92 | |
| 93 | static uint64_t max732x_features[] = { |
| 94 | [MAX7319] = GROUP_A(IO_8I) | INT_CAPS(INT_MERGED_MASK), |
| 95 | [MAX7320] = GROUP_B(IO_8O), |
| 96 | [MAX7321] = GROUP_A(IO_8P) | INT_CAPS(INT_NO_MASK), |
| 97 | [MAX7322] = GROUP_A(IO_4I4O) | INT_CAPS(INT_MERGED_MASK), |
| 98 | [MAX7323] = GROUP_A(IO_4P4O) | INT_CAPS(INT_INDEP_MASK), |
| 99 | [MAX7324] = GROUP_A(IO_8I) | GROUP_B(IO_8O) | INT_CAPS(INT_MERGED_MASK), |
| 100 | [MAX7325] = GROUP_A(IO_8P) | GROUP_B(IO_8O) | INT_CAPS(INT_NO_MASK), |
| 101 | [MAX7326] = GROUP_A(IO_4I4O) | GROUP_B(IO_8O) | INT_CAPS(INT_MERGED_MASK), |
| 102 | [MAX7327] = GROUP_A(IO_4P4O) | GROUP_B(IO_8O) | INT_CAPS(INT_NO_MASK), |
| 103 | }; |
| 104 | |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 105 | static const struct i2c_device_id max732x_id[] = { |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 106 | { "max7319", MAX7319 }, |
| 107 | { "max7320", MAX7320 }, |
| 108 | { "max7321", MAX7321 }, |
| 109 | { "max7322", MAX7322 }, |
| 110 | { "max7323", MAX7323 }, |
| 111 | { "max7324", MAX7324 }, |
| 112 | { "max7325", MAX7325 }, |
| 113 | { "max7326", MAX7326 }, |
| 114 | { "max7327", MAX7327 }, |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 115 | { }, |
| 116 | }; |
| 117 | MODULE_DEVICE_TABLE(i2c, max732x_id); |
| 118 | |
| 119 | struct max732x_chip { |
| 120 | struct gpio_chip gpio_chip; |
| 121 | |
| 122 | struct i2c_client *client; /* "main" client */ |
| 123 | struct i2c_client *client_dummy; |
| 124 | struct i2c_client *client_group_a; |
| 125 | struct i2c_client *client_group_b; |
| 126 | |
| 127 | unsigned int mask_group_a; |
| 128 | unsigned int dir_input; |
| 129 | unsigned int dir_output; |
| 130 | |
| 131 | struct mutex lock; |
| 132 | uint8_t reg_out[2]; |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 133 | |
| 134 | #ifdef CONFIG_GPIO_MAX732X_IRQ |
| 135 | struct mutex irq_lock; |
| 136 | int irq_base; |
| 137 | uint8_t irq_mask; |
| 138 | uint8_t irq_mask_cur; |
| 139 | uint8_t irq_trig_raise; |
| 140 | uint8_t irq_trig_fall; |
| 141 | uint8_t irq_features; |
| 142 | #endif |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 143 | }; |
| 144 | |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 145 | static int max732x_writeb(struct max732x_chip *chip, int group_a, uint8_t val) |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 146 | { |
| 147 | struct i2c_client *client; |
| 148 | int ret; |
| 149 | |
| 150 | client = group_a ? chip->client_group_a : chip->client_group_b; |
| 151 | ret = i2c_smbus_write_byte(client, val); |
| 152 | if (ret < 0) { |
| 153 | dev_err(&client->dev, "failed writing\n"); |
| 154 | return ret; |
| 155 | } |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 160 | static int max732x_readb(struct max732x_chip *chip, int group_a, uint8_t *val) |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 161 | { |
| 162 | struct i2c_client *client; |
| 163 | int ret; |
| 164 | |
| 165 | client = group_a ? chip->client_group_a : chip->client_group_b; |
| 166 | ret = i2c_smbus_read_byte(client); |
| 167 | if (ret < 0) { |
| 168 | dev_err(&client->dev, "failed reading\n"); |
| 169 | return ret; |
| 170 | } |
| 171 | |
| 172 | *val = (uint8_t)ret; |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | static inline int is_group_a(struct max732x_chip *chip, unsigned off) |
| 177 | { |
| 178 | return (1u << off) & chip->mask_group_a; |
| 179 | } |
| 180 | |
| 181 | static int max732x_gpio_get_value(struct gpio_chip *gc, unsigned off) |
| 182 | { |
| 183 | struct max732x_chip *chip; |
| 184 | uint8_t reg_val; |
| 185 | int ret; |
| 186 | |
| 187 | chip = container_of(gc, struct max732x_chip, gpio_chip); |
| 188 | |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 189 | ret = max732x_readb(chip, is_group_a(chip, off), ®_val); |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 190 | if (ret < 0) |
| 191 | return 0; |
| 192 | |
| 193 | return reg_val & (1u << (off & 0x7)); |
| 194 | } |
| 195 | |
| 196 | static void max732x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val) |
| 197 | { |
| 198 | struct max732x_chip *chip; |
| 199 | uint8_t reg_out, mask = 1u << (off & 0x7); |
| 200 | int ret; |
| 201 | |
| 202 | chip = container_of(gc, struct max732x_chip, gpio_chip); |
| 203 | |
| 204 | mutex_lock(&chip->lock); |
| 205 | |
| 206 | reg_out = (off > 7) ? chip->reg_out[1] : chip->reg_out[0]; |
| 207 | reg_out = (val) ? reg_out | mask : reg_out & ~mask; |
| 208 | |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 209 | ret = max732x_writeb(chip, is_group_a(chip, off), reg_out); |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 210 | if (ret < 0) |
| 211 | goto out; |
| 212 | |
| 213 | /* update the shadow register then */ |
| 214 | if (off > 7) |
| 215 | chip->reg_out[1] = reg_out; |
| 216 | else |
| 217 | chip->reg_out[0] = reg_out; |
| 218 | out: |
| 219 | mutex_unlock(&chip->lock); |
| 220 | } |
| 221 | |
| 222 | static int max732x_gpio_direction_input(struct gpio_chip *gc, unsigned off) |
| 223 | { |
| 224 | struct max732x_chip *chip; |
| 225 | unsigned int mask = 1u << off; |
| 226 | |
| 227 | chip = container_of(gc, struct max732x_chip, gpio_chip); |
| 228 | |
| 229 | if ((mask & chip->dir_input) == 0) { |
| 230 | dev_dbg(&chip->client->dev, "%s port %d is output only\n", |
| 231 | chip->client->name, off); |
| 232 | return -EACCES; |
| 233 | } |
| 234 | |
Marc Zyngier | a13c186 | 2010-05-26 14:42:21 -0700 | [diff] [blame] | 235 | /* |
| 236 | * Open-drain pins must be set to high impedance (which is |
| 237 | * equivalent to output-high) to be turned into an input. |
| 238 | */ |
| 239 | if ((mask & chip->dir_output)) |
| 240 | max732x_gpio_set_value(gc, off, 1); |
| 241 | |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static int max732x_gpio_direction_output(struct gpio_chip *gc, |
| 246 | unsigned off, int val) |
| 247 | { |
| 248 | struct max732x_chip *chip; |
| 249 | unsigned int mask = 1u << off; |
| 250 | |
| 251 | chip = container_of(gc, struct max732x_chip, gpio_chip); |
| 252 | |
| 253 | if ((mask & chip->dir_output) == 0) { |
| 254 | dev_dbg(&chip->client->dev, "%s port %d is input only\n", |
| 255 | chip->client->name, off); |
| 256 | return -EACCES; |
| 257 | } |
| 258 | |
| 259 | max732x_gpio_set_value(gc, off, val); |
| 260 | return 0; |
| 261 | } |
| 262 | |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 263 | #ifdef CONFIG_GPIO_MAX732X_IRQ |
| 264 | static int max732x_writew(struct max732x_chip *chip, uint16_t val) |
| 265 | { |
| 266 | int ret; |
| 267 | |
| 268 | val = cpu_to_le16(val); |
| 269 | |
| 270 | ret = i2c_master_send(chip->client_group_a, (char *)&val, 2); |
| 271 | if (ret < 0) { |
| 272 | dev_err(&chip->client_group_a->dev, "failed writing\n"); |
| 273 | return ret; |
| 274 | } |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | static int max732x_readw(struct max732x_chip *chip, uint16_t *val) |
| 280 | { |
| 281 | int ret; |
| 282 | |
| 283 | ret = i2c_master_recv(chip->client_group_a, (char *)val, 2); |
| 284 | if (ret < 0) { |
| 285 | dev_err(&chip->client_group_a->dev, "failed reading\n"); |
| 286 | return ret; |
| 287 | } |
| 288 | |
| 289 | *val = le16_to_cpu(*val); |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static void max732x_irq_update_mask(struct max732x_chip *chip) |
| 294 | { |
| 295 | uint16_t msg; |
| 296 | |
| 297 | if (chip->irq_mask == chip->irq_mask_cur) |
| 298 | return; |
| 299 | |
| 300 | chip->irq_mask = chip->irq_mask_cur; |
| 301 | |
| 302 | if (chip->irq_features == INT_NO_MASK) |
| 303 | return; |
| 304 | |
| 305 | mutex_lock(&chip->lock); |
| 306 | |
| 307 | switch (chip->irq_features) { |
| 308 | case INT_INDEP_MASK: |
| 309 | msg = (chip->irq_mask << 8) | chip->reg_out[0]; |
| 310 | max732x_writew(chip, msg); |
| 311 | break; |
| 312 | |
| 313 | case INT_MERGED_MASK: |
| 314 | msg = chip->irq_mask | chip->reg_out[0]; |
| 315 | max732x_writeb(chip, 1, (uint8_t)msg); |
| 316 | break; |
| 317 | } |
| 318 | |
| 319 | mutex_unlock(&chip->lock); |
| 320 | } |
| 321 | |
| 322 | static int max732x_gpio_to_irq(struct gpio_chip *gc, unsigned off) |
| 323 | { |
| 324 | struct max732x_chip *chip; |
| 325 | |
| 326 | chip = container_of(gc, struct max732x_chip, gpio_chip); |
| 327 | return chip->irq_base + off; |
| 328 | } |
| 329 | |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 330 | static void max732x_irq_mask(struct irq_data *d) |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 331 | { |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 332 | struct max732x_chip *chip = irq_data_get_irq_chip_data(d); |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 333 | |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 334 | chip->irq_mask_cur &= ~(1 << (d->irq - chip->irq_base)); |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 335 | } |
| 336 | |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 337 | static void max732x_irq_unmask(struct irq_data *d) |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 338 | { |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 339 | struct max732x_chip *chip = irq_data_get_irq_chip_data(d); |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 340 | |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 341 | chip->irq_mask_cur |= 1 << (d->irq - chip->irq_base); |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 342 | } |
| 343 | |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 344 | static void max732x_irq_bus_lock(struct irq_data *d) |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 345 | { |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 346 | struct max732x_chip *chip = irq_data_get_irq_chip_data(d); |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 347 | |
| 348 | mutex_lock(&chip->irq_lock); |
| 349 | chip->irq_mask_cur = chip->irq_mask; |
| 350 | } |
| 351 | |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 352 | static void max732x_irq_bus_sync_unlock(struct irq_data *d) |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 353 | { |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 354 | struct max732x_chip *chip = irq_data_get_irq_chip_data(d); |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 355 | |
| 356 | max732x_irq_update_mask(chip); |
| 357 | mutex_unlock(&chip->irq_lock); |
| 358 | } |
| 359 | |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 360 | static int max732x_irq_set_type(struct irq_data *d, unsigned int type) |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 361 | { |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 362 | struct max732x_chip *chip = irq_data_get_irq_chip_data(d); |
| 363 | uint16_t off = d->irq - chip->irq_base; |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 364 | uint16_t mask = 1 << off; |
| 365 | |
| 366 | if (!(mask & chip->dir_input)) { |
| 367 | dev_dbg(&chip->client->dev, "%s port %d is output only\n", |
| 368 | chip->client->name, off); |
| 369 | return -EACCES; |
| 370 | } |
| 371 | |
| 372 | if (!(type & IRQ_TYPE_EDGE_BOTH)) { |
| 373 | dev_err(&chip->client->dev, "irq %d: unsupported type %d\n", |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 374 | d->irq, type); |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 375 | return -EINVAL; |
| 376 | } |
| 377 | |
| 378 | if (type & IRQ_TYPE_EDGE_FALLING) |
| 379 | chip->irq_trig_fall |= mask; |
| 380 | else |
| 381 | chip->irq_trig_fall &= ~mask; |
| 382 | |
| 383 | if (type & IRQ_TYPE_EDGE_RISING) |
| 384 | chip->irq_trig_raise |= mask; |
| 385 | else |
| 386 | chip->irq_trig_raise &= ~mask; |
| 387 | |
| 388 | return max732x_gpio_direction_input(&chip->gpio_chip, off); |
| 389 | } |
| 390 | |
| 391 | static struct irq_chip max732x_irq_chip = { |
| 392 | .name = "max732x", |
Lennert Buytenhek | fbc4667a | 2011-01-12 17:00:14 -0800 | [diff] [blame] | 393 | .irq_mask = max732x_irq_mask, |
| 394 | .irq_unmask = max732x_irq_unmask, |
| 395 | .irq_bus_lock = max732x_irq_bus_lock, |
| 396 | .irq_bus_sync_unlock = max732x_irq_bus_sync_unlock, |
| 397 | .irq_set_type = max732x_irq_set_type, |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 398 | }; |
| 399 | |
| 400 | static uint8_t max732x_irq_pending(struct max732x_chip *chip) |
| 401 | { |
| 402 | uint8_t cur_stat; |
| 403 | uint8_t old_stat; |
| 404 | uint8_t trigger; |
| 405 | uint8_t pending; |
| 406 | uint16_t status; |
| 407 | int ret; |
| 408 | |
| 409 | ret = max732x_readw(chip, &status); |
| 410 | if (ret) |
| 411 | return 0; |
| 412 | |
| 413 | trigger = status >> 8; |
| 414 | trigger &= chip->irq_mask; |
| 415 | |
| 416 | if (!trigger) |
| 417 | return 0; |
| 418 | |
| 419 | cur_stat = status & 0xFF; |
| 420 | cur_stat &= chip->irq_mask; |
| 421 | |
| 422 | old_stat = cur_stat ^ trigger; |
| 423 | |
| 424 | pending = (old_stat & chip->irq_trig_fall) | |
| 425 | (cur_stat & chip->irq_trig_raise); |
| 426 | pending &= trigger; |
| 427 | |
| 428 | return pending; |
| 429 | } |
| 430 | |
| 431 | static irqreturn_t max732x_irq_handler(int irq, void *devid) |
| 432 | { |
| 433 | struct max732x_chip *chip = devid; |
| 434 | uint8_t pending; |
| 435 | uint8_t level; |
| 436 | |
| 437 | pending = max732x_irq_pending(chip); |
| 438 | |
| 439 | if (!pending) |
| 440 | return IRQ_HANDLED; |
| 441 | |
| 442 | do { |
| 443 | level = __ffs(pending); |
| 444 | handle_nested_irq(level + chip->irq_base); |
| 445 | |
| 446 | pending &= ~(1 << level); |
| 447 | } while (pending); |
| 448 | |
| 449 | return IRQ_HANDLED; |
| 450 | } |
| 451 | |
| 452 | static int max732x_irq_setup(struct max732x_chip *chip, |
| 453 | const struct i2c_device_id *id) |
| 454 | { |
| 455 | struct i2c_client *client = chip->client; |
| 456 | struct max732x_platform_data *pdata = client->dev.platform_data; |
| 457 | int has_irq = max732x_features[id->driver_data] >> 32; |
| 458 | int ret; |
| 459 | |
| 460 | if (pdata->irq_base && has_irq != INT_NONE) { |
| 461 | int lvl; |
| 462 | |
| 463 | chip->irq_base = pdata->irq_base; |
| 464 | chip->irq_features = has_irq; |
| 465 | mutex_init(&chip->irq_lock); |
| 466 | |
| 467 | for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) { |
| 468 | int irq = lvl + chip->irq_base; |
| 469 | |
| 470 | if (!(chip->dir_input & (1 << lvl))) |
| 471 | continue; |
| 472 | |
Thomas Gleixner | b51804b | 2011-03-24 21:27:36 +0000 | [diff] [blame] | 473 | irq_set_chip_data(irq, chip); |
| 474 | irq_set_chip_and_handler(irq, &max732x_irq_chip, |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 475 | handle_edge_irq); |
Thomas Gleixner | b51804b | 2011-03-24 21:27:36 +0000 | [diff] [blame] | 476 | irq_set_nested_thread(irq, 1); |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 477 | #ifdef CONFIG_ARM |
| 478 | set_irq_flags(irq, IRQF_VALID); |
| 479 | #else |
Thomas Gleixner | b51804b | 2011-03-24 21:27:36 +0000 | [diff] [blame] | 480 | irq_set_noprobe(irq); |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 481 | #endif |
| 482 | } |
| 483 | |
| 484 | ret = request_threaded_irq(client->irq, |
| 485 | NULL, |
| 486 | max732x_irq_handler, |
| 487 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
| 488 | dev_name(&client->dev), chip); |
| 489 | if (ret) { |
| 490 | dev_err(&client->dev, "failed to request irq %d\n", |
| 491 | client->irq); |
| 492 | goto out_failed; |
| 493 | } |
| 494 | |
| 495 | chip->gpio_chip.to_irq = max732x_gpio_to_irq; |
| 496 | } |
| 497 | |
| 498 | return 0; |
| 499 | |
| 500 | out_failed: |
| 501 | chip->irq_base = 0; |
| 502 | return ret; |
| 503 | } |
| 504 | |
| 505 | static void max732x_irq_teardown(struct max732x_chip *chip) |
| 506 | { |
| 507 | if (chip->irq_base) |
| 508 | free_irq(chip->client->irq, chip); |
| 509 | } |
| 510 | #else /* CONFIG_GPIO_MAX732X_IRQ */ |
| 511 | static int max732x_irq_setup(struct max732x_chip *chip, |
| 512 | const struct i2c_device_id *id) |
| 513 | { |
| 514 | struct i2c_client *client = chip->client; |
| 515 | struct max732x_platform_data *pdata = client->dev.platform_data; |
| 516 | int has_irq = max732x_features[id->driver_data] >> 32; |
| 517 | |
| 518 | if (pdata->irq_base && has_irq != INT_NONE) |
| 519 | dev_warn(&client->dev, "interrupt support not compiled in\n"); |
| 520 | |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | static void max732x_irq_teardown(struct max732x_chip *chip) |
| 525 | { |
| 526 | } |
| 527 | #endif |
| 528 | |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 529 | static int __devinit max732x_setup_gpio(struct max732x_chip *chip, |
| 530 | const struct i2c_device_id *id, |
| 531 | unsigned gpio_start) |
| 532 | { |
| 533 | struct gpio_chip *gc = &chip->gpio_chip; |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 534 | uint32_t id_data = (uint32_t)max732x_features[id->driver_data]; |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 535 | int i, port = 0; |
| 536 | |
| 537 | for (i = 0; i < 16; i++, id_data >>= 2) { |
| 538 | unsigned int mask = 1 << port; |
| 539 | |
| 540 | switch (id_data & 0x3) { |
| 541 | case PORT_OUTPUT: |
| 542 | chip->dir_output |= mask; |
| 543 | break; |
| 544 | case PORT_INPUT: |
| 545 | chip->dir_input |= mask; |
| 546 | break; |
| 547 | case PORT_OPENDRAIN: |
| 548 | chip->dir_output |= mask; |
| 549 | chip->dir_input |= mask; |
| 550 | break; |
| 551 | default: |
| 552 | continue; |
| 553 | } |
| 554 | |
| 555 | if (i < 8) |
| 556 | chip->mask_group_a |= mask; |
| 557 | port++; |
| 558 | } |
| 559 | |
| 560 | if (chip->dir_input) |
| 561 | gc->direction_input = max732x_gpio_direction_input; |
| 562 | if (chip->dir_output) { |
| 563 | gc->direction_output = max732x_gpio_direction_output; |
| 564 | gc->set = max732x_gpio_set_value; |
| 565 | } |
| 566 | gc->get = max732x_gpio_get_value; |
| 567 | gc->can_sleep = 1; |
| 568 | |
| 569 | gc->base = gpio_start; |
| 570 | gc->ngpio = port; |
| 571 | gc->label = chip->client->name; |
| 572 | gc->owner = THIS_MODULE; |
| 573 | |
| 574 | return port; |
| 575 | } |
| 576 | |
| 577 | static int __devinit max732x_probe(struct i2c_client *client, |
| 578 | const struct i2c_device_id *id) |
| 579 | { |
| 580 | struct max732x_platform_data *pdata; |
| 581 | struct max732x_chip *chip; |
| 582 | struct i2c_client *c; |
| 583 | uint16_t addr_a, addr_b; |
| 584 | int ret, nr_port; |
| 585 | |
| 586 | pdata = client->dev.platform_data; |
Ben Dooks | a342d21 | 2009-01-15 13:50:45 -0800 | [diff] [blame] | 587 | if (pdata == NULL) { |
| 588 | dev_dbg(&client->dev, "no platform data\n"); |
| 589 | return -EINVAL; |
| 590 | } |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 591 | |
| 592 | chip = kzalloc(sizeof(struct max732x_chip), GFP_KERNEL); |
| 593 | if (chip == NULL) |
| 594 | return -ENOMEM; |
| 595 | chip->client = client; |
| 596 | |
| 597 | nr_port = max732x_setup_gpio(chip, id, pdata->gpio_base); |
| 598 | |
| 599 | addr_a = (client->addr & 0x0f) | 0x60; |
| 600 | addr_b = (client->addr & 0x0f) | 0x50; |
| 601 | |
| 602 | switch (client->addr & 0x70) { |
| 603 | case 0x60: |
| 604 | chip->client_group_a = client; |
Axel Lin | 5535cb6 | 2010-05-26 14:42:20 -0700 | [diff] [blame] | 605 | if (nr_port > 8) { |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 606 | c = i2c_new_dummy(client->adapter, addr_b); |
| 607 | chip->client_group_b = chip->client_dummy = c; |
| 608 | } |
| 609 | break; |
| 610 | case 0x50: |
| 611 | chip->client_group_b = client; |
Axel Lin | 5535cb6 | 2010-05-26 14:42:20 -0700 | [diff] [blame] | 612 | if (nr_port > 8) { |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 613 | c = i2c_new_dummy(client->adapter, addr_a); |
| 614 | chip->client_group_a = chip->client_dummy = c; |
| 615 | } |
| 616 | break; |
| 617 | default: |
| 618 | dev_err(&client->dev, "invalid I2C address specified %02x\n", |
| 619 | client->addr); |
| 620 | ret = -EINVAL; |
| 621 | goto out_failed; |
| 622 | } |
| 623 | |
| 624 | mutex_init(&chip->lock); |
| 625 | |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 626 | max732x_readb(chip, is_group_a(chip, 0), &chip->reg_out[0]); |
Axel Lin | 5535cb6 | 2010-05-26 14:42:20 -0700 | [diff] [blame] | 627 | if (nr_port > 8) |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 628 | max732x_readb(chip, is_group_a(chip, 8), &chip->reg_out[1]); |
| 629 | |
| 630 | ret = max732x_irq_setup(chip, id); |
| 631 | if (ret) |
| 632 | goto out_failed; |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 633 | |
| 634 | ret = gpiochip_add(&chip->gpio_chip); |
| 635 | if (ret) |
| 636 | goto out_failed; |
| 637 | |
| 638 | if (pdata->setup) { |
| 639 | ret = pdata->setup(client, chip->gpio_chip.base, |
| 640 | chip->gpio_chip.ngpio, pdata->context); |
| 641 | if (ret < 0) |
| 642 | dev_warn(&client->dev, "setup failed, %d\n", ret); |
| 643 | } |
| 644 | |
| 645 | i2c_set_clientdata(client, chip); |
| 646 | return 0; |
| 647 | |
| 648 | out_failed: |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 649 | max732x_irq_teardown(chip); |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 650 | kfree(chip); |
| 651 | return ret; |
| 652 | } |
| 653 | |
| 654 | static int __devexit max732x_remove(struct i2c_client *client) |
| 655 | { |
| 656 | struct max732x_platform_data *pdata = client->dev.platform_data; |
| 657 | struct max732x_chip *chip = i2c_get_clientdata(client); |
| 658 | int ret; |
| 659 | |
| 660 | if (pdata->teardown) { |
| 661 | ret = pdata->teardown(client, chip->gpio_chip.base, |
| 662 | chip->gpio_chip.ngpio, pdata->context); |
| 663 | if (ret < 0) { |
| 664 | dev_err(&client->dev, "%s failed, %d\n", |
| 665 | "teardown", ret); |
| 666 | return ret; |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | ret = gpiochip_remove(&chip->gpio_chip); |
| 671 | if (ret) { |
| 672 | dev_err(&client->dev, "%s failed, %d\n", |
| 673 | "gpiochip_remove()", ret); |
| 674 | return ret; |
| 675 | } |
| 676 | |
Marc Zyngier | a80a0bb | 2010-05-26 14:42:16 -0700 | [diff] [blame] | 677 | max732x_irq_teardown(chip); |
| 678 | |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 679 | /* unregister any dummy i2c_client */ |
| 680 | if (chip->client_dummy) |
| 681 | i2c_unregister_device(chip->client_dummy); |
| 682 | |
| 683 | kfree(chip); |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | static struct i2c_driver max732x_driver = { |
| 688 | .driver = { |
| 689 | .name = "max732x", |
| 690 | .owner = THIS_MODULE, |
| 691 | }, |
| 692 | .probe = max732x_probe, |
| 693 | .remove = __devexit_p(max732x_remove), |
| 694 | .id_table = max732x_id, |
| 695 | }; |
| 696 | |
| 697 | static int __init max732x_init(void) |
| 698 | { |
| 699 | return i2c_add_driver(&max732x_driver); |
| 700 | } |
David Brownell | 2f8d119 | 2008-10-15 22:03:13 -0700 | [diff] [blame] | 701 | /* register after i2c postcore initcall and before |
| 702 | * subsys initcalls that may rely on these GPIOs |
| 703 | */ |
| 704 | subsys_initcall(max732x_init); |
Eric Miao | bbcd6d5 | 2008-07-25 01:46:14 -0700 | [diff] [blame] | 705 | |
| 706 | static void __exit max732x_exit(void) |
| 707 | { |
| 708 | i2c_del_driver(&max732x_driver); |
| 709 | } |
| 710 | module_exit(max732x_exit); |
| 711 | |
| 712 | MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"); |
| 713 | MODULE_DESCRIPTION("GPIO expander driver for MAX732X"); |
| 714 | MODULE_LICENSE("GPL"); |