/* * ST Microelectronics MFD: stmpe's driver * * Copyright (C) ST-Ericsson SA 2010 * * License Terms: GNU General Public License, version 2 * Author: Rabin Vincent for ST-Ericsson */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "stmpe.h" static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks) { return stmpe->variant->enable(stmpe, blocks, true); } static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks) { return stmpe->variant->enable(stmpe, blocks, false); } static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg) { int ret; ret = stmpe->ci->read_byte(stmpe, reg); if (ret < 0) dev_err(stmpe->dev, "failed to read reg %#x: %d\n", reg, ret); dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret); return ret; } static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val) { int ret; dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val); ret = stmpe->ci->write_byte(stmpe, reg, val); if (ret < 0) dev_err(stmpe->dev, "failed to write reg %#x: %d\n", reg, ret); return ret; } static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val) { int ret; ret = __stmpe_reg_read(stmpe, reg); if (ret < 0) return ret; ret &= ~mask; ret |= val; return __stmpe_reg_write(stmpe, reg, ret); } static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values) { int ret; ret = stmpe->ci->read_block(stmpe, reg, length, values); if (ret < 0) dev_err(stmpe->dev, "failed to read regs %#x: %d\n", reg, ret); dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret); stmpe_dump_bytes("stmpe rd: ", values, length); return ret; } static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, const u8 *values) { int ret; dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length); stmpe_dump_bytes("stmpe wr: ", values, length); ret = stmpe->ci->write_block(stmpe, reg, length, values); if (ret < 0) dev_err(stmpe->dev, "failed to write regs %#x: %d\n", reg, ret); return ret; } /** * stmpe_enable - enable blocks on an STMPE device * @stmpe: Device to work on * @blocks: Mask of blocks (enum stmpe_block values) to enable */ int stmpe_enable(struct stmpe *stmpe, unsigned int blocks) { int ret; mutex_lock(&stmpe->lock); ret = __stmpe_enable(stmpe, blocks); mutex_unlock(&stmpe->lock); return ret; } EXPORT_SYMBOL_GPL(stmpe_enable); /** * stmpe_disable - disable blocks on an STMPE device * @stmpe: Device to work on * @blocks: Mask of blocks (enum stmpe_block values) to enable */ int stmpe_disable(struct stmpe *stmpe, unsigned int blocks) { int ret; mutex_lock(&stmpe->lock); ret = __stmpe_disable(stmpe, blocks); mutex_unlock(&stmpe->lock); return ret; } EXPORT_SYMBOL_GPL(stmpe_disable); /** * stmpe_reg_read() - read a single STMPE register * @stmpe: Device to read from * @reg: Register to read */ int stmpe_reg_read(struct stmpe *stmpe, u8 reg) { int ret; mutex_lock(&stmpe->lock); ret = __stmpe_reg_read(stmpe, reg); mutex_unlock(&stmpe->lock); return ret; } EXPORT_SYMBOL_GPL(stmpe_reg_read); /** * stmpe_reg_write() - write a single STMPE register * @stmpe: Device to write to * @reg: Register to write * @val: Value to write */ int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val) { int ret; mutex_lock(&stmpe->lock); ret = __stmpe_reg_write(stmpe, reg, val); mutex_unlock(&stmpe->lock); return ret; } EXPORT_SYMBOL_GPL(stmpe_reg_write); /** * stmpe_set_bits() - set the value of a bitfield in a STMPE register * @stmpe: Device to write to * @reg: Register to write * @mask: Mask of bits to set * @val: Value to set */ int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val) { int ret; mutex_lock(&stmpe->lock); ret = __stmpe_set_bits(stmpe, reg, mask, val); mutex_unlock(&stmpe->lock); return ret; } EXPORT_SYMBOL_GPL(stmpe_set_bits); /** * stmpe_block_read() - read multiple STMPE registers * @stmpe: Device to read from * @reg: First register * @length: Number of registers * @values: Buffer to write to */ int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values) { int ret; mutex_lock(&stmpe->lock); ret = __stmpe_block_read(stmpe, reg, length, values); mutex_unlock(&stmpe->lock); return ret; } EXPORT_SYMBOL_GPL(stmpe_block_read); /** * stmpe_block_write() - write multiple STMPE registers * @stmpe: Device to write to * @reg: First register * @length: Number of registers * @values: Values to write */ int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, const u8 *values) { int ret; mutex_lock(&stmpe->lock); ret = __stmpe_block_write(stmpe, reg, length, values); mutex_unlock(&stmpe->lock); return ret; } EXPORT_SYMBOL_GPL(stmpe_block_write); /** * stmpe_set_altfunc()- set the alternate function for STMPE pins * @stmpe: Device to configure * @pins: Bitmask of pins to affect * @block: block to enable alternate functions for * * @pins is assumed to have a bit set for each of the bits whose alternate * function is to be changed, numbered according to the GPIOXY numbers. * * If the GPIO module is not enabled, this function automatically enables it in * order to perform the change. */ int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block) { struct stmpe_variant_info *variant = stmpe->variant; u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB]; int af_bits = variant->af_bits; int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8); int mask = (1 << af_bits) - 1; u8 regs[numregs]; int af, afperreg, ret; if (!variant->get_altfunc) return 0; afperreg = 8 / af_bits; mutex_lock(&stmpe->lock); ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO); if (ret < 0) goto out; ret = __stmpe_block_read(stmpe, regaddr, numregs, regs); if (ret < 0) goto out; af = variant->get_altfunc(stmpe, block); while (pins) { int pin = __ffs(pins); int regoffset = numregs - (pin / afperreg) - 1; int pos = (pin % afperreg) * (8 / afperreg); regs[regoffset] &= ~(mask << pos); regs[regoffset] |= af << pos; pins &= ~(1 << pin); } ret = __stmpe_block_write(stmpe, regaddr, numregs, regs); out: mutex_unlock(&stmpe->lock); return ret; } EXPORT_SYMBOL_GPL(stmpe_set_altfunc); /* * GPIO (all variants) */ static struct resource stmpe_gpio_resources[] = { /* Start and end filled dynamically */ { .flags = IORESOURCE_IRQ, }, }; static const struct mfd_cell stmpe_gpio_cell = { .name = "stmpe-gpio", .of_compatible = "st,stmpe-gpio", .resources = stmpe_gpio_resources, .num_resources = ARRAY_SIZE(stmpe_gpio_resources), }; static const struct mfd_cell stmpe_gpio_cell_noirq = { .name = "stmpe-gpio", .of_compatible = "st,stmpe-gpio", /* gpio cell resources consist of an irq only so no resources here */ }; /* * Keypad (1601, 2401, 2403) */ static struct resource stmpe_keypad_resources[] = { { .name = "KEYPAD", .flags = IORESOURCE_IRQ, }, { .name = "KEYPAD_OVER", .flags = IORESOURCE_IRQ, }, }; static const struct mfd_cell stmpe_keypad_cell = { .name = "stmpe-keypad", .of_compatible = "st,stmpe-keypad", .resources = stmpe_keypad_resources, .num_resources = ARRAY_SIZE(stmpe_keypad_resources), }; /* * STMPE801 */ static const u8 stmpe801_regs[] = { [STMPE_IDX_CHIP_ID] = STMPE801_REG_CHIP_ID, [STMPE_IDX_ICR_LSB] = STMPE801_REG_SYS_CTRL, [STMPE_IDX_GPMR_LSB] = STMPE801_REG_GPIO_MP_STA, [STMPE_IDX_GPSR_LSB] = STMPE801_REG_GPIO_SET_PIN, [STMPE_IDX_GPCR_LSB] = STMPE801_REG_GPIO_SET_PIN, [STMPE_IDX_GPDR_LSB] = STMPE801_REG_GPIO_DIR, [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN, [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA, }; static struct stmpe_variant_block stmpe801_blocks[] = { { .cell = &stmpe_gpio_cell, .irq = 0, .block = STMPE_BLOCK_GPIO, }, }; static struct stmpe_variant_block stmpe801_blocks_noirq[] = { { .cell = &stmpe_gpio_cell_noirq, .block = STMPE_BLOCK_GPIO, }, }; static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks, bool enable) { if (blocks & STMPE_BLOCK_GPIO) return 0; else return -EINVAL; } static struct stmpe_variant_info stmpe801 = { .name = "stmpe801", .id_val = STMPE801_ID, .id_mask = 0xffff, .num_gpios = 8, .regs = stmpe801_regs, .blocks = stmpe801_blocks, .num_blocks = ARRAY_SIZE(stmpe801_blocks), .num_irqs = STMPE801_NR_INTERNAL_IRQS, .enable = stmpe801_enable, }; static struct stmpe_variant_info stmpe801_noirq = { .name = "stmpe801", .id_val = STMPE801_ID, .id_mask = 0xffff, .num_gpios = 8, .regs = stmpe801_regs, .blocks = stmpe801_blocks_noirq, .num_blocks = ARRAY_SIZE(stmpe801_blocks_noirq), .enable = stmpe801_enable, }; /* * Touchscreen (STMPE811 or STMPE610) */ static struct resource stmpe_ts_resources[] = { { .name = "TOUCH_DET", .flags = IORESOURCE_IRQ, }, { .name = "FIFO_TH", .flags = IORESOURCE_IRQ, }, }; static const struct mfd_cell stmpe_ts_cell = { .name = "stmpe-ts", .of_compatible = "st,stmpe-ts", .resources = stmpe_ts_resources, .num_resources = ARRAY_SIZE(stmpe_ts_resources), }; /* * STMPE811 or STMPE610 */ static const u8 stmpe811_regs[] = { [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID, [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL, [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN, [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA, [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA, [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN, [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN, [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR, [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE, [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE, [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF, [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN, [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA, [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED, }; static struct stmpe_variant_block stmpe811_blocks[] = { { .cell = &stmpe_gpio_cell, .irq = STMPE811_IRQ_GPIOC, .block = STMPE_BLOCK_GPIO, }, { .cell = &stmpe_ts_cell, .irq = STMPE811_IRQ_TOUCH_DET, .block = STMPE_BLOCK_TOUCHSCREEN, }, }; static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks, bool enable) { unsigned int mask = 0; if (blocks & STMPE_BLOCK_GPIO) mask |= STMPE811_SYS_CTRL2_GPIO_OFF; if (blocks & STMPE_BLOCK_ADC) mask |= STMPE811_SYS_CTRL2_ADC_OFF; if (blocks & STMPE_BLOCK_TOUCHSCREEN) mask |= STMPE811_SYS_CTRL2_TSC_OFF; return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask, enable ? 0 : mask); } static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) { /* 0 for touchscreen, 1 for GPIO */ return block != STMPE_BLOCK_TOUCHSCREEN; } static struct stmpe_variant_info stmpe811 = { .name = "stmpe811", .id_val = 0x0811, .id_mask = 0xffff, .num_gpios = 8, .af_bits = 1, .regs = stmpe811_regs, .blocks = stmpe811_blocks, .num_blocks = ARRAY_SIZE(stmpe811_blocks), .num_irqs = STMPE811_NR_INTERNAL_IRQS, .enable = stmpe811_enable, .get_altfunc = stmpe811_get_altfunc, }; /* Similar to 811, except number of gpios */ static struct stmpe_variant_info stmpe610 = { .name = "stmpe610", .id_val = 0x0811, .id_mask = 0xffff, .num_gpios = 6, .af_bits = 1, .regs = stmpe811_regs, .blocks = stmpe811_blocks, .num_blocks = ARRAY_SIZE(stmpe811_blocks), .num_irqs = STMPE811_NR_INTERNAL_IRQS, .enable = stmpe811_enable, .get_altfunc = stmpe811_get_altfunc, }; /* * STMPE1601 */ static const u8 stmpe1601_regs[] = { [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID, [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB, [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB, [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB, [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB, [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB, [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB, [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB, [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB, [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB, [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB, [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB, [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB, [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB, }; static struct stmpe_variant_block stmpe1601_blocks[] = { { .cell = &stmpe_gpio_cell, .irq = STMPE1601_IRQ_GPIOC, .block = STMPE_BLOCK_GPIO, }, { .cell = &stmpe_keypad_cell, .irq = STMPE1601_IRQ_KEYPAD, .block = STMPE_BLOCK_KEYPAD, }, }; /* supported autosleep timeout delay (in msecs) */ static const int stmpe_autosleep_delay[] = { 4, 16, 32, 64, 128, 256, 512, 1024, }; static int stmpe_round_timeout(int timeout) { int i; for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) { if (stmpe_autosleep_delay[i] >= timeout) return i; } /* * requests for delays longer than supported should not return the * longest supported delay */ return -EINVAL; } static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout) { int ret; if (!stmpe->variant->enable_autosleep) return -ENOSYS; mutex_lock(&stmpe->lock); ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout); mutex_unlock(&stmpe->lock); return ret; } /* * Both stmpe 1601/2403 support same layout for autosleep */ static int stmpe1601_autosleep(struct stmpe *stmpe, int autosleep_timeout) { int ret, timeout; /* choose the best available timeout */ timeout = stmpe_round_timeout(autosleep_timeout); if (timeout < 0) { dev_err(stmpe->dev, "invalid timeout\n"); return timeout; } ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2, STMPE1601_AUTOSLEEP_TIMEOUT_MASK, timeout); if (ret < 0) return ret; return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2, STPME1601_AUTOSLEEP_ENABLE, STPME1601_AUTOSLEEP_ENABLE); } static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks, bool enable) { unsigned int mask = 0; if (blocks & STMPE_BLOCK_GPIO) mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO; else mask &= ~STMPE1601_SYS_CTRL_ENABLE_GPIO; if (blocks & STMPE_BLOCK_KEYPAD) mask |= STMPE1601_SYS_CTRL_ENABLE_KPC; else mask &= ~STMPE1601_SYS_CTRL_ENABLE_KPC; if (blocks & STMPE_BLOCK_PWM) mask |= STMPE1601_SYS_CTRL_ENABLE_SPWM; else mask &= ~STMPE1601_SYS_CTRL_ENABLE_SPWM; return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask, enable ? mask : 0); } static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) { switch (block) { case STMPE_BLOCK_PWM: return 2; case STMPE_BLOCK_KEYPAD: return 1; case STMPE_BLOCK_GPIO: default: return 0; } } static struct stmpe_variant_info stmpe1601 = { .name = "stmpe1601", .id_val = 0x0210, .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */ .num_gpios = 16, .af_bits = 2, .regs = stmpe1601_regs, .blocks = stmpe1601_blocks, .num_blocks = ARRAY_SIZE(stmpe1601_blocks), .num_irqs = STMPE1601_NR_INTERNAL_IRQS, .enable = stmpe1601_enable, .get_altfunc = stmpe1601_get_altfunc, .enable_autosleep = stmpe1601_autosleep, }; /* * STMPE1801 */ static const u8 stmpe1801_regs[] = { [STMPE_IDX_CHIP_ID] = STMPE1801_REG_CHIP_ID, [STMPE_IDX_ICR_LSB] = STMPE1801_REG_INT_CTRL_LOW, [STMPE_IDX_IER_LSB] = STMPE1801_REG_INT_EN_MASK_LOW, [STMPE_IDX_ISR_LSB] = STMPE1801_REG_INT_STA_LOW, [STMPE_IDX_GPMR_LSB] = STMPE1801_REG_GPIO_MP_LOW, [STMPE_IDX_GPSR_LSB] = STMPE1801_REG_GPIO_SET_LOW, [STMPE_IDX_GPCR_LSB] = STMPE1801_REG_GPIO_CLR_LOW, [STMPE_IDX_GPDR_LSB] = STMPE1801_REG_GPIO_SET_DIR_LOW, [STMPE_IDX_GPRER_LSB] = STMPE1801_REG_GPIO_RE_LOW, [STMPE_IDX_GPFER_LSB] = STMPE1801_REG_GPIO_FE_LOW, [STMPE_IDX_IEGPIOR_LSB] = STMPE1801_REG_INT_EN_GPIO_MASK_LOW, [STMPE_IDX_ISGPIOR_LSB] = STMPE1801_REG_INT_STA_GPIO_LOW, }; static struct stmpe_variant_block stmpe1801_blocks[] = { { .cell = &stmpe_gpio_cell, .irq = STMPE1801_IRQ_GPIOC, .block = STMPE_BLOCK_GPIO, }, { .cell = &stmpe_keypad_cell, .irq = STMPE1801_IRQ_KEYPAD, .block = STMPE_BLOCK_KEYPAD, }, }; static int stmpe1801_enable(struct stmpe *stmpe, unsigned int blocks, bool enable) { unsigned int mask = 0; if (blocks & STMPE_BLOCK_GPIO) mask |= STMPE1801_MSK_INT_EN_GPIO; if (blocks & STMPE_BLOCK_KEYPAD) mask |= STMPE1801_MSK_INT_EN_KPC; return __stmpe_set_bits(stmpe, STMPE1801_REG_INT_EN_MASK_LOW, mask, enable ? mask : 0); } static int stmpe1801_reset(struct stmpe *stmpe) { unsigned long timeout; int ret = 0; ret = __stmpe_set_bits(stmpe, STMPE1801_REG_SYS_CTRL, STMPE1801_MSK_SYS_CTRL_RESET, STMPE1801_MSK_SYS_CTRL_RESET); if (ret < 0) return ret; timeout = jiffies + msecs_to_jiffies(100); while (time_before(jiffies, timeout)) { ret = __stmpe_reg_read(stmpe, STMPE1801_REG_SYS_CTRL); if (ret < 0) return ret; if (!(ret & STMPE1801_MSK_SYS_CTRL_RESET)) return 0; usleep_range(100, 200); } return -EIO; } static struct stmpe_variant_info stmpe1801 = { .name = "stmpe1801", .id_val = STMPE1801_ID, .id_mask = 0xfff0, .num_gpios = 18, .af_bits = 0, .regs = stmpe1801_regs, .blocks = stmpe1801_blocks, .num_blocks = ARRAY_SIZE(stmpe1801_blocks), .num_irqs = STMPE1801_NR_INTERNAL_IRQS, .enable = stmpe1801_enable, /* stmpe1801 do not have any gpio alternate function */ .get_altfunc = NULL, }; /* * STMPE24XX */ static const u8 stmpe24xx_regs[] = { [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID, [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB, [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB, [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB, [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB, [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB, [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB, [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB, [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB, [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB, [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB, [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB, [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB, [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB, }; static struct stmpe_variant_block stmpe24xx_blocks[] = { { .cell = &stmpe_gpio_cell, .irq = STMPE24XX_IRQ_GPIOC, .block = STMPE_BLOCK_GPIO, }, { .cell = &stmpe_keypad_cell, .irq = STMPE24XX_IRQ_KEYPAD, .block = STMPE_BLOCK_KEYPAD, }, }; static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks, bool enable) { unsigned int mask = 0; if (blocks & STMPE_BLOCK_GPIO) mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO; if (blocks & STMPE_BLOCK_KEYPAD) mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC; return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask, enable ? mask : 0); } static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) { switch (block) { case STMPE_BLOCK_ROTATOR: return 2; case STMPE_BLOCK_KEYPAD: return 1; case STMPE_BLOCK_GPIO: default: return 0; } } static struct stmpe_variant_info stmpe2401 = { .name = "stmpe2401", .id_val = 0x0101, .id_mask = 0xffff, .num_gpios = 24, .af_bits = 2, .regs = stmpe24xx_regs, .blocks = stmpe24xx_blocks, .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, .enable = stmpe24xx_enable, .get_altfunc = stmpe24xx_get_altfunc, }; static struct stmpe_variant_info stmpe2403 = { .name = "stmpe2403", .id_val = 0x0120, .id_mask = 0xffff, .num_gpios = 24, .af_bits = 2, .regs = stmpe24xx_regs, .blocks = stmpe24xx_blocks, .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, .enable = stmpe24xx_enable, .get_altfunc = stmpe24xx_get_altfunc, .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */ }; static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = { [STMPE610] = &stmpe610, [STMPE801] = &stmpe801, [STMPE811] = &stmpe811, [STMPE1601] = &stmpe1601, [STMPE1801] = &stmpe1801, [STMPE2401] = &stmpe2401, [STMPE2403] = &stmpe2403, }; /* * These devices can be connected in a 'no-irq' configuration - the irq pin * is not used and the device cannot interrupt the CPU. Here we only list * devices which support this configuration - the driver will fail probing * for any devices not listed here which are configured in this way. */ static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = { [STMPE801] = &stmpe801_noirq, }; static irqreturn_t stmpe_irq(int irq, void *data) { struct stmpe *stmpe = data; struct stmpe_variant_info *variant = stmpe->variant; int num = DIV_ROUND_UP(variant->num_irqs, 8); u8 israddr; u8 isr[num]; int ret; int i; if (variant->id_val == STMPE801_ID) { int base = irq_create_mapping(stmpe->domain, 0); handle_nested_irq(base); return IRQ_HANDLED; } if (variant->id_val == STMPE1801_ID) israddr = stmpe->regs[STMPE_IDX_ISR_LSB]; else israddr = stmpe->regs[STMPE_IDX_ISR_MSB]; ret = stmpe_block_read(stmpe, israddr, num, isr); if (ret < 0) return IRQ_NONE; for (i = 0; i < num; i++) { int bank = num - i - 1; u8 status = isr[i]; u8 clear; status &= stmpe->ier[bank]; if (!status) continue; clear = status; while (status) { int bit = __ffs(status); int line = bank * 8 + bit; int nestedirq = irq_create_mapping(stmpe->domain, line); handle_nested_irq(nestedirq); status &= ~(1 << bit); } stmpe_reg_write(stmpe, israddr + i, clear); } return IRQ_HANDLED; } static void stmpe_irq_lock(struct irq_data *data) { struct stmpe *stmpe = irq_data_get_irq_chip_data(data); mutex_lock(&stmpe->irq_lock); } static void stmpe_irq_sync_unlock(struct irq_data *data) { struct stmpe *stmpe = irq_data_get_irq_chip_data(data); struct stmpe_variant_info *variant = stmpe->variant; int num = DIV_ROUND_UP(variant->num_irqs, 8); int i; for (i = 0; i < num; i++) { u8 new = stmpe->ier[i]; u8 old = stmpe->oldier[i]; if (new == old) continue; stmpe->oldier[i] = new; stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new); } mutex_unlock(&stmpe->irq_lock); } static void stmpe_irq_mask(struct irq_data *data) { struct stmpe *stmpe = irq_data_get_irq_chip_data(data); int offset = data->hwirq; int regoffset = offset / 8; int mask = 1 << (offset % 8); stmpe->ier[regoffset] &= ~mask; } static void stmpe_irq_unmask(struct irq_data *data) { struct stmpe *stmpe = irq_data_get_irq_chip_data(data); int offset = data->hwirq; int regoffset = offset / 8; int mask = 1 << (offset % 8); stmpe->ier[regoffset] |= mask; } static struct irq_chip stmpe_irq_chip = { .name = "stmpe", .irq_bus_lock = stmpe_irq_lock, .irq_bus_sync_unlock = stmpe_irq_sync_unlock, .irq_mask = stmpe_irq_mask, .irq_unmask = stmpe_irq_unmask, }; static int stmpe_irq_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t hwirq) { struct stmpe *stmpe = d->host_data; struct irq_chip *chip = NULL; if (stmpe->variant->id_val != STMPE801_ID) chip = &stmpe_irq_chip; irq_set_chip_data(virq, stmpe); irq_set_chip_and_handler(virq, chip, handle_edge_irq); irq_set_nested_thread(virq, 1); #ifdef CONFIG_ARM set_irq_flags(virq, IRQF_VALID); #else irq_set_noprobe(virq); #endif return 0; } static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq) { #ifdef CONFIG_ARM set_irq_flags(virq, 0); #endif irq_set_chip_and_handler(virq, NULL, NULL); irq_set_chip_data(virq, NULL); } static struct irq_domain_ops stmpe_irq_ops = { .map = stmpe_irq_map, .unmap = stmpe_irq_unmap, .xlate = irq_domain_xlate_twocell, }; static int stmpe_irq_init(struct stmpe *stmpe, struct device_node *np) { int base = 0; int num_irqs = stmpe->variant->num_irqs; if (!np) base = stmpe->irq_base; stmpe->domain = irq_domain_add_simple(np, num_irqs, base, &stmpe_irq_ops, stmpe); if (!stmpe->domain) { dev_err(stmpe->dev, "Failed to create irqdomain\n"); return -ENOSYS; } return 0; } static int stmpe_chip_init(struct stmpe *stmpe) { unsigned int irq_trigger = stmpe->pdata->irq_trigger; int autosleep_timeout = stmpe->pdata->autosleep_timeout; struct stmpe_variant_info *variant = stmpe->variant; u8 icr = 0; unsigned int id; u8 data[2]; int ret; ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID], ARRAY_SIZE(data), data); if (ret < 0) return ret; id = (data[0] << 8) | data[1]; if ((id & variant->id_mask) != variant->id_val) { dev_err(stmpe->dev, "unknown chip id: %#x\n", id); return -EINVAL; } dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id); /* Disable all modules -- subdrivers should enable what they need. */ ret = stmpe_disable(stmpe, ~0); if (ret) return ret; if (id == STMPE1801_ID) { ret = stmpe1801_reset(stmpe); if (ret < 0) return ret; } if (stmpe->irq >= 0) { if (id == STMPE801_ID) icr = STMPE801_REG_SYS_CTRL_INT_EN; else icr = STMPE_ICR_LSB_GIM; /* STMPE801 doesn't support Edge interrupts */ if (id != STMPE801_ID) { if (irq_trigger == IRQF_TRIGGER_FALLING || irq_trigger == IRQF_TRIGGER_RISING) icr |= STMPE_ICR_LSB_EDGE; } if (irq_trigger == IRQF_TRIGGER_RISING || irq_trigger == IRQF_TRIGGER_HIGH) { if (id == STMPE801_ID) icr |= STMPE801_REG_SYS_CTRL_INT_HI; else icr |= STMPE_ICR_LSB_HIGH; } } if (stmpe->pdata->autosleep) { ret = stmpe_autosleep(stmpe, autosleep_timeout); if (ret) return ret; } return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr); } static int stmpe_add_device(struct stmpe *stmpe, const struct mfd_cell *cell) { return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1, NULL, stmpe->irq_base, stmpe->domain); } static int stmpe_devices_init(struct stmpe *stmpe) { struct stmpe_variant_info *variant = stmpe->variant; unsigned int platform_blocks = stmpe->pdata->blocks; int ret = -EINVAL; int i, j; for (i = 0; i < variant->num_blocks; i++) { struct stmpe_variant_block *block = &variant->blocks[i]; if (!(platform_blocks & block->block)) continue; for (j = 0; j < block->cell->num_resources; j++) { struct resource *res = (struct resource *) &block->cell->resources[j]; /* Dynamically fill in a variant's IRQ. */ if (res->flags & IORESOURCE_IRQ) res->start = res->end = block->irq + j; } platform_blocks &= ~block->block; ret = stmpe_add_device(stmpe, block->cell); if (ret) return ret; } if (platform_blocks) dev_warn(stmpe->dev, "platform wants blocks (%#x) not present on variant", platform_blocks); return ret; } static void stmpe_of_probe(struct stmpe_platform_data *pdata, struct device_node *np) { struct device_node *child; pdata->id = of_alias_get_id(np, "stmpe-i2c"); if (pdata->id < 0) pdata->id = -1; pdata->irq_trigger = IRQF_TRIGGER_NONE; of_property_read_u32(np, "st,autosleep-timeout", &pdata->autosleep_timeout); pdata->autosleep = (pdata->autosleep_timeout) ? true : false; for_each_child_of_node(np, child) { if (!strcmp(child->name, "stmpe_gpio")) { pdata->blocks |= STMPE_BLOCK_GPIO; } else if (!strcmp(child->name, "stmpe_keypad")) { pdata->blocks |= STMPE_BLOCK_KEYPAD; } else if (!strcmp(child->name, "stmpe_touchscreen")) { pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN; } else if (!strcmp(child->name, "stmpe_adc")) { pdata->blocks |= STMPE_BLOCK_ADC; } else if (!strcmp(child->name, "stmpe_pwm")) { pdata->blocks |= STMPE_BLOCK_PWM; } else if (!strcmp(child->name, "stmpe_rotator")) { pdata->blocks |= STMPE_BLOCK_ROTATOR; } } } /* Called from client specific probe routines */ int stmpe_probe(struct stmpe_client_info *ci, int partnum) { struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev); struct device_node *np = ci->dev->of_node; struct stmpe *stmpe; int ret; if (!pdata) { if (!np) return -EINVAL; pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; stmpe_of_probe(pdata, np); if (of_find_property(np, "interrupts", NULL) == NULL) ci->irq = -1; } stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL); if (!stmpe) return -ENOMEM; mutex_init(&stmpe->irq_lock); mutex_init(&stmpe->lock); stmpe->dev = ci->dev; stmpe->client = ci->client; stmpe->pdata = pdata; stmpe->irq_base = pdata->irq_base; stmpe->ci = ci; stmpe->partnum = partnum; stmpe->variant = stmpe_variant_info[partnum]; stmpe->regs = stmpe->variant->regs; stmpe->num_gpios = stmpe->variant->num_gpios; dev_set_drvdata(stmpe->dev, stmpe); if (ci->init) ci->init(stmpe); if (pdata->irq_over_gpio) { ret = devm_gpio_request_one(ci->dev, pdata->irq_gpio, GPIOF_DIR_IN, "stmpe"); if (ret) { dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n", ret); return ret; } stmpe->irq = gpio_to_irq(pdata->irq_gpio); } else { stmpe->irq = ci->irq; } if (stmpe->irq < 0) { /* use alternate variant info for no-irq mode, if supported */ dev_info(stmpe->dev, "%s configured in no-irq mode by platform data\n", stmpe->variant->name); if (!stmpe_noirq_variant_info[stmpe->partnum]) { dev_err(stmpe->dev, "%s does not support no-irq mode!\n", stmpe->variant->name); return -ENODEV; } stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum]; } else if (pdata->irq_trigger == IRQF_TRIGGER_NONE) { pdata->irq_trigger = irq_get_trigger_type(stmpe->irq); } ret = stmpe_chip_init(stmpe); if (ret) return ret; if (stmpe->irq >= 0) { ret = stmpe_irq_init(stmpe, np); if (ret) return ret; ret = devm_request_threaded_irq(ci->dev, stmpe->irq, NULL, stmpe_irq, pdata->irq_trigger | IRQF_ONESHOT, "stmpe", stmpe); if (ret) { dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret); return ret; } } ret = stmpe_devices_init(stmpe); if (!ret) return 0; dev_err(stmpe->dev, "failed to add children\n"); mfd_remove_devices(stmpe->dev); return ret; } int stmpe_remove(struct stmpe *stmpe) { mfd_remove_devices(stmpe->dev); return 0; } #ifdef CONFIG_PM static int stmpe_suspend(struct device *dev) { struct stmpe *stmpe = dev_get_drvdata(dev); if (stmpe->irq >= 0 && device_may_wakeup(dev)) enable_irq_wake(stmpe->irq); return 0; } static int stmpe_resume(struct device *dev) { struct stmpe *stmpe = dev_get_drvdata(dev); if (stmpe->irq >= 0 && device_may_wakeup(dev)) disable_irq_wake(stmpe->irq); return 0; } const struct dev_pm_ops stmpe_dev_pm_ops = { .suspend = stmpe_suspend, .resume = stmpe_resume, }; #endif