| Message ID | d31637cb701ecf556515539fd40e7098e0c99bfd.1521128287.git.vilhelm.gray@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | Implement get_multiple for ACCES and PC/104 drivers | expand |
Hi William,
I love your patch! Yet something to improve:
[auto build test ERROR on v4.16-rc4]
[also build test ERROR on next-20180316]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/William-Breathitt-Gray/Implement-get_multiple-for-ACCES-and-PC-104-drivers/20180317-224135
config: i386-randconfig-a0-201810 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All errors (new ones prefixed by >>):
drivers/gpio/gpio-104-dio-48e.c: In function 'dio48e_gpio_get_multiple':
>> drivers/gpio/gpio-104-dio-48e.c:214:3: error: 'word_mask' undeclared (first use in this function)
word_mask = mask[word_index] & (port_mask << word_offset);
^
drivers/gpio/gpio-104-dio-48e.c:214:3: note: each undeclared identifier is reported only once for each function it appears in
drivers/gpio/gpio-104-dio-48e.c:195:16: warning: unused variable 'mask_word' [-Wunused-variable]
unsigned long mask_word;
^
vim +/word_mask +214 drivers/gpio/gpio-104-dio-48e.c
184
185 static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
186 unsigned long *bits)
187 {
188 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
189 size_t i;
190 const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
191 const unsigned int gpio_reg_size = 8;
192 unsigned int bits_offset;
193 size_t word_index;
194 unsigned int word_offset;
195 unsigned long mask_word;
196 const unsigned long port_mask = GENMASK(gpio_reg_size, 0);
197 unsigned long port_state;
198
199 /* clear bits array to a clean slate */
200 bitmap_zero(bits, chip->ngpio);
201
202 /* get bits are evaluated a gpio port register at a time */
203 for (i = 0; i < ARRAY_SIZE(ports); i++) {
204 /* gpio offset in bits array */
205 bits_offset = i * gpio_reg_size;
206
207 /* word index for bits array */
208 word_index = BIT_WORD(bits_offset);
209
210 /* gpio offset within current word of bits array */
211 word_offset = bits_offset % BITS_PER_LONG;
212
213 /* mask of get bits for current gpio within current word */
> 214 word_mask = mask[word_index] & (port_mask << word_offset);
215 if (!word_mask) {
216 /* no get bits in this port so skip to next one */
217 continue;
218 }
219
220 /* read bits from current gpio port */
221 port_state = inb(dio48egpio->base + ports[i]);
222
223 /* store acquired bits at respective bits array offset */
224 bits[word_index] |= port_state << word_offset;
225 }
226
227 return 0;
228 }
229
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c index bab3b94c5cbc..537b436c6e7f 100644 --- a/drivers/gpio/gpio-104-dio-48e.c +++ b/drivers/gpio/gpio-104-dio-48e.c @@ -182,6 +182,51 @@ static int dio48e_gpio_get(struct gpio_chip *chip, unsigned offset) return !!(port_state & mask); } +static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, + unsigned long *bits) +{ + struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); + size_t i; + const size_t ports[] = { 0, 1, 2, 4, 5, 6 }; + const unsigned int gpio_reg_size = 8; + unsigned int bits_offset; + size_t word_index; + unsigned int word_offset; + unsigned long mask_word; + const unsigned long port_mask = GENMASK(gpio_reg_size, 0); + unsigned long port_state; + + /* clear bits array to a clean slate */ + bitmap_zero(bits, chip->ngpio); + + /* get bits are evaluated a gpio port register at a time */ + for (i = 0; i < ARRAY_SIZE(ports); i++) { + /* gpio offset in bits array */ + bits_offset = i * gpio_reg_size; + + /* word index for bits array */ + word_index = BIT_WORD(bits_offset); + + /* gpio offset within current word of bits array */ + word_offset = bits_offset % BITS_PER_LONG; + + /* mask of get bits for current gpio within current word */ + word_mask = mask[word_index] & (port_mask << word_offset); + if (!word_mask) { + /* no get bits in this port so skip to next one */ + continue; + } + + /* read bits from current gpio port */ + port_state = inb(dio48egpio->base + ports[i]); + + /* store acquired bits at respective bits array offset */ + bits[word_index] |= port_state << word_offset; + } + + return 0; +} + static void dio48e_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); @@ -384,6 +429,7 @@ static int dio48e_probe(struct device *dev, unsigned int id) dio48egpio->chip.direction_input = dio48e_gpio_direction_input; dio48egpio->chip.direction_output = dio48e_gpio_direction_output; dio48egpio->chip.get = dio48e_gpio_get; + dio48egpio->chip.get_multiple = dio48e_gpio_get_multiple; dio48egpio->chip.set = dio48e_gpio_set; dio48egpio->chip.set_multiple = dio48e_gpio_set_multiple; dio48egpio->base = base[id];
The ACCES I/O 104-DIO-48E series of devices contain two Programmable Peripheral Interface (PPI) chips of type 82C55, which each feature three 8-bit ports of I/O. Since eight input lines are acquired on a single port input read, the 104-DIO-48E GPIO driver may improve multiple input reads by utilizing a get_multiple callback. This patch implements the dio48e_gpio_get_multiple function which serves as the respective get_multiple callback. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> --- drivers/gpio/gpio-104-dio-48e.c | 46 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+)