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847 lines
22 KiB
847 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* drivers/i2c/chips/lm8323.c |
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* |
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* Copyright (C) 2007-2009 Nokia Corporation |
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* |
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* Written by Daniel Stone <[email protected]> |
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* Timo O. Karjalainen <[email protected]> |
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* |
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* Updated by Felipe Balbi <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/interrupt.h> |
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#include <linux/sched.h> |
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#include <linux/mutex.h> |
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#include <linux/delay.h> |
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#include <linux/input.h> |
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#include <linux/leds.h> |
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#include <linux/platform_data/lm8323.h> |
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#include <linux/pm.h> |
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#include <linux/slab.h> |
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/* Commands to send to the chip. */ |
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#define LM8323_CMD_READ_ID 0x80 /* Read chip ID. */ |
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#define LM8323_CMD_WRITE_CFG 0x81 /* Set configuration item. */ |
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#define LM8323_CMD_READ_INT 0x82 /* Get interrupt status. */ |
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#define LM8323_CMD_RESET 0x83 /* Reset, same as external one */ |
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#define LM8323_CMD_WRITE_PORT_SEL 0x85 /* Set GPIO in/out. */ |
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#define LM8323_CMD_WRITE_PORT_STATE 0x86 /* Set GPIO pullup. */ |
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#define LM8323_CMD_READ_PORT_SEL 0x87 /* Get GPIO in/out. */ |
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#define LM8323_CMD_READ_PORT_STATE 0x88 /* Get GPIO pullup. */ |
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#define LM8323_CMD_READ_FIFO 0x89 /* Read byte from FIFO. */ |
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#define LM8323_CMD_RPT_READ_FIFO 0x8a /* Read FIFO (no increment). */ |
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#define LM8323_CMD_SET_ACTIVE 0x8b /* Set active time. */ |
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#define LM8323_CMD_READ_ERR 0x8c /* Get error status. */ |
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#define LM8323_CMD_READ_ROTATOR 0x8e /* Read rotator status. */ |
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#define LM8323_CMD_SET_DEBOUNCE 0x8f /* Set debouncing time. */ |
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#define LM8323_CMD_SET_KEY_SIZE 0x90 /* Set keypad size. */ |
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#define LM8323_CMD_READ_KEY_SIZE 0x91 /* Get keypad size. */ |
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#define LM8323_CMD_READ_CFG 0x92 /* Get configuration item. */ |
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#define LM8323_CMD_WRITE_CLOCK 0x93 /* Set clock config. */ |
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#define LM8323_CMD_READ_CLOCK 0x94 /* Get clock config. */ |
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#define LM8323_CMD_PWM_WRITE 0x95 /* Write PWM script. */ |
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#define LM8323_CMD_START_PWM 0x96 /* Start PWM engine. */ |
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#define LM8323_CMD_STOP_PWM 0x97 /* Stop PWM engine. */ |
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/* Interrupt status. */ |
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#define INT_KEYPAD 0x01 /* Key event. */ |
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#define INT_ROTATOR 0x02 /* Rotator event. */ |
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#define INT_ERROR 0x08 /* Error: use CMD_READ_ERR. */ |
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#define INT_NOINIT 0x10 /* Lost configuration. */ |
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#define INT_PWM1 0x20 /* PWM1 stopped. */ |
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#define INT_PWM2 0x40 /* PWM2 stopped. */ |
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#define INT_PWM3 0x80 /* PWM3 stopped. */ |
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/* Errors (signalled by INT_ERROR, read with CMD_READ_ERR). */ |
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#define ERR_BADPAR 0x01 /* Bad parameter. */ |
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#define ERR_CMDUNK 0x02 /* Unknown command. */ |
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#define ERR_KEYOVR 0x04 /* Too many keys pressed. */ |
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#define ERR_FIFOOVER 0x40 /* FIFO overflow. */ |
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/* Configuration keys (CMD_{WRITE,READ}_CFG). */ |
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#define CFG_MUX1SEL 0x01 /* Select MUX1_OUT input. */ |
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#define CFG_MUX1EN 0x02 /* Enable MUX1_OUT. */ |
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#define CFG_MUX2SEL 0x04 /* Select MUX2_OUT input. */ |
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#define CFG_MUX2EN 0x08 /* Enable MUX2_OUT. */ |
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#define CFG_PSIZE 0x20 /* Package size (must be 0). */ |
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#define CFG_ROTEN 0x40 /* Enable rotator. */ |
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/* Clock settings (CMD_{WRITE,READ}_CLOCK). */ |
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#define CLK_RCPWM_INTERNAL 0x00 |
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#define CLK_RCPWM_EXTERNAL 0x03 |
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#define CLK_SLOWCLKEN 0x08 /* Enable 32.768kHz clock. */ |
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#define CLK_SLOWCLKOUT 0x40 /* Enable slow pulse output. */ |
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/* The possible addresses corresponding to CONFIG1 and CONFIG2 pin wirings. */ |
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#define LM8323_I2C_ADDR00 (0x84 >> 1) /* 1000 010x */ |
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#define LM8323_I2C_ADDR01 (0x86 >> 1) /* 1000 011x */ |
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#define LM8323_I2C_ADDR10 (0x88 >> 1) /* 1000 100x */ |
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#define LM8323_I2C_ADDR11 (0x8A >> 1) /* 1000 101x */ |
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/* Key event fifo length */ |
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#define LM8323_FIFO_LEN 15 |
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/* Commands for PWM engine; feed in with PWM_WRITE. */ |
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/* Load ramp counter from duty cycle field (range 0 - 0xff). */ |
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#define PWM_SET(v) (0x4000 | ((v) & 0xff)) |
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/* Go to start of script. */ |
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#define PWM_GOTOSTART 0x0000 |
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/* |
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* Stop engine (generates interrupt). If reset is 1, clear the program |
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* counter, else leave it. |
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*/ |
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#define PWM_END(reset) (0xc000 | (!!(reset) << 11)) |
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/* |
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* Ramp. If s is 1, divide clock by 512, else divide clock by 16. |
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* Take t clock scales (up to 63) per step, for n steps (up to 126). |
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* If u is set, ramp up, else ramp down. |
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*/ |
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#define PWM_RAMP(s, t, n, u) ((!!(s) << 14) | ((t) & 0x3f) << 8 | \ |
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((n) & 0x7f) | ((u) ? 0 : 0x80)) |
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/* |
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* Loop (i.e. jump back to pos) for a given number of iterations (up to 63). |
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* If cnt is zero, execute until PWM_END is encountered. |
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*/ |
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#define PWM_LOOP(cnt, pos) (0xa000 | (((cnt) & 0x3f) << 7) | \ |
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((pos) & 0x3f)) |
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/* |
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* Wait for trigger. Argument is a mask of channels, shifted by the channel |
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* number, e.g. 0xa for channels 3 and 1. Note that channels are numbered |
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* from 1, not 0. |
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*/ |
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#define PWM_WAIT_TRIG(chans) (0xe000 | (((chans) & 0x7) << 6)) |
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/* Send trigger. Argument is same as PWM_WAIT_TRIG. */ |
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#define PWM_SEND_TRIG(chans) (0xe000 | ((chans) & 0x7)) |
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struct lm8323_pwm { |
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int id; |
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int fade_time; |
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int brightness; |
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int desired_brightness; |
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bool enabled; |
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bool running; |
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/* pwm lock */ |
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struct mutex lock; |
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struct work_struct work; |
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struct led_classdev cdev; |
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struct lm8323_chip *chip; |
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}; |
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struct lm8323_chip { |
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/* device lock */ |
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struct mutex lock; |
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struct i2c_client *client; |
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struct input_dev *idev; |
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bool kp_enabled; |
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bool pm_suspend; |
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unsigned keys_down; |
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char phys[32]; |
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unsigned short keymap[LM8323_KEYMAP_SIZE]; |
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int size_x; |
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int size_y; |
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int debounce_time; |
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int active_time; |
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struct lm8323_pwm pwm[LM8323_NUM_PWMS]; |
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}; |
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#define client_to_lm8323(c) container_of(c, struct lm8323_chip, client) |
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#define dev_to_lm8323(d) container_of(d, struct lm8323_chip, client->dev) |
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#define cdev_to_pwm(c) container_of(c, struct lm8323_pwm, cdev) |
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#define work_to_pwm(w) container_of(w, struct lm8323_pwm, work) |
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#define LM8323_MAX_DATA 8 |
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/* |
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* To write, we just access the chip's address in write mode, and dump the |
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* command and data out on the bus. The command byte and data are taken as |
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* sequential u8s out of varargs, to a maximum of LM8323_MAX_DATA. |
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*/ |
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static int lm8323_write(struct lm8323_chip *lm, int len, ...) |
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{ |
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int ret, i; |
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va_list ap; |
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u8 data[LM8323_MAX_DATA]; |
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va_start(ap, len); |
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if (unlikely(len > LM8323_MAX_DATA)) { |
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dev_err(&lm->client->dev, "tried to send %d bytes\n", len); |
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va_end(ap); |
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return 0; |
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} |
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for (i = 0; i < len; i++) |
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data[i] = va_arg(ap, int); |
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va_end(ap); |
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/* |
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* If the host is asleep while we send the data, we can get a NACK |
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* back while it wakes up, so try again, once. |
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*/ |
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ret = i2c_master_send(lm->client, data, len); |
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if (unlikely(ret == -EREMOTEIO)) |
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ret = i2c_master_send(lm->client, data, len); |
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if (unlikely(ret != len)) |
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dev_err(&lm->client->dev, "sent %d bytes of %d total\n", |
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len, ret); |
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return ret; |
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} |
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/* |
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* To read, we first send the command byte to the chip and end the transaction, |
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* then access the chip in read mode, at which point it will send the data. |
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*/ |
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static int lm8323_read(struct lm8323_chip *lm, u8 cmd, u8 *buf, int len) |
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{ |
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int ret; |
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/* |
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* If the host is asleep while we send the byte, we can get a NACK |
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* back while it wakes up, so try again, once. |
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*/ |
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ret = i2c_master_send(lm->client, &cmd, 1); |
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if (unlikely(ret == -EREMOTEIO)) |
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ret = i2c_master_send(lm->client, &cmd, 1); |
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if (unlikely(ret != 1)) { |
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dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n", |
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cmd); |
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return 0; |
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} |
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ret = i2c_master_recv(lm->client, buf, len); |
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if (unlikely(ret != len)) |
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dev_err(&lm->client->dev, "wanted %d bytes, got %d\n", |
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len, ret); |
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return ret; |
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} |
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/* |
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* Set the chip active time (idle time before it enters halt). |
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*/ |
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static void lm8323_set_active_time(struct lm8323_chip *lm, int time) |
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{ |
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lm8323_write(lm, 2, LM8323_CMD_SET_ACTIVE, time >> 2); |
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} |
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/* |
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* The signals are AT-style: the low 7 bits are the keycode, and the top |
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* bit indicates the state (1 for down, 0 for up). |
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*/ |
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static inline u8 lm8323_whichkey(u8 event) |
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{ |
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return event & 0x7f; |
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} |
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static inline int lm8323_ispress(u8 event) |
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{ |
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return (event & 0x80) ? 1 : 0; |
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} |
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static void process_keys(struct lm8323_chip *lm) |
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{ |
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u8 event; |
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u8 key_fifo[LM8323_FIFO_LEN + 1]; |
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int old_keys_down = lm->keys_down; |
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int ret; |
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int i = 0; |
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/* |
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* Read all key events from the FIFO at once. Next READ_FIFO clears the |
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* FIFO even if we didn't read all events previously. |
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*/ |
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ret = lm8323_read(lm, LM8323_CMD_READ_FIFO, key_fifo, LM8323_FIFO_LEN); |
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if (ret < 0) { |
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dev_err(&lm->client->dev, "Failed reading fifo \n"); |
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return; |
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} |
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key_fifo[ret] = 0; |
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while ((event = key_fifo[i++])) { |
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u8 key = lm8323_whichkey(event); |
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int isdown = lm8323_ispress(event); |
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unsigned short keycode = lm->keymap[key]; |
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dev_vdbg(&lm->client->dev, "key 0x%02x %s\n", |
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key, isdown ? "down" : "up"); |
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if (lm->kp_enabled) { |
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input_event(lm->idev, EV_MSC, MSC_SCAN, key); |
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input_report_key(lm->idev, keycode, isdown); |
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input_sync(lm->idev); |
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} |
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if (isdown) |
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lm->keys_down++; |
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else |
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lm->keys_down--; |
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} |
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/* |
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* Errata: We need to ensure that the chip never enters halt mode |
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* during a keypress, so set active time to 0. When it's released, |
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* we can enter halt again, so set the active time back to normal. |
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*/ |
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if (!old_keys_down && lm->keys_down) |
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lm8323_set_active_time(lm, 0); |
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if (old_keys_down && !lm->keys_down) |
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lm8323_set_active_time(lm, lm->active_time); |
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} |
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static void lm8323_process_error(struct lm8323_chip *lm) |
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{ |
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u8 error; |
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if (lm8323_read(lm, LM8323_CMD_READ_ERR, &error, 1) == 1) { |
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if (error & ERR_FIFOOVER) |
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dev_vdbg(&lm->client->dev, "fifo overflow!\n"); |
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if (error & ERR_KEYOVR) |
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dev_vdbg(&lm->client->dev, |
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"more than two keys pressed\n"); |
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if (error & ERR_CMDUNK) |
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dev_vdbg(&lm->client->dev, |
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"unknown command submitted\n"); |
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if (error & ERR_BADPAR) |
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dev_vdbg(&lm->client->dev, "bad command parameter\n"); |
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} |
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} |
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static void lm8323_reset(struct lm8323_chip *lm) |
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{ |
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/* The docs say we must pass 0xAA as the data byte. */ |
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lm8323_write(lm, 2, LM8323_CMD_RESET, 0xAA); |
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} |
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static int lm8323_configure(struct lm8323_chip *lm) |
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{ |
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int keysize = (lm->size_x << 4) | lm->size_y; |
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int clock = (CLK_SLOWCLKEN | CLK_RCPWM_EXTERNAL); |
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int debounce = lm->debounce_time >> 2; |
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int active = lm->active_time >> 2; |
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/* |
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* Active time must be greater than the debounce time: if it's |
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* a close-run thing, give ourselves a 12ms buffer. |
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*/ |
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if (debounce >= active) |
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active = debounce + 3; |
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lm8323_write(lm, 2, LM8323_CMD_WRITE_CFG, 0); |
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lm8323_write(lm, 2, LM8323_CMD_WRITE_CLOCK, clock); |
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lm8323_write(lm, 2, LM8323_CMD_SET_KEY_SIZE, keysize); |
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lm8323_set_active_time(lm, lm->active_time); |
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lm8323_write(lm, 2, LM8323_CMD_SET_DEBOUNCE, debounce); |
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lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff); |
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lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_SEL, 0, 0); |
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/* |
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* Not much we can do about errors at this point, so just hope |
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* for the best. |
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*/ |
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return 0; |
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} |
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static void pwm_done(struct lm8323_pwm *pwm) |
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{ |
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mutex_lock(&pwm->lock); |
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pwm->running = false; |
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if (pwm->desired_brightness != pwm->brightness) |
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schedule_work(&pwm->work); |
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mutex_unlock(&pwm->lock); |
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} |
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/* |
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* Bottom half: handle the interrupt by posting key events, or dealing with |
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* errors appropriately. |
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*/ |
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static irqreturn_t lm8323_irq(int irq, void *_lm) |
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{ |
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struct lm8323_chip *lm = _lm; |
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u8 ints; |
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int i; |
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mutex_lock(&lm->lock); |
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while ((lm8323_read(lm, LM8323_CMD_READ_INT, &ints, 1) == 1) && ints) { |
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if (likely(ints & INT_KEYPAD)) |
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process_keys(lm); |
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if (ints & INT_ROTATOR) { |
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/* We don't currently support the rotator. */ |
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dev_vdbg(&lm->client->dev, "rotator fired\n"); |
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} |
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if (ints & INT_ERROR) { |
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dev_vdbg(&lm->client->dev, "error!\n"); |
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lm8323_process_error(lm); |
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} |
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if (ints & INT_NOINIT) { |
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dev_err(&lm->client->dev, "chip lost config; " |
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"reinitialising\n"); |
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lm8323_configure(lm); |
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} |
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for (i = 0; i < LM8323_NUM_PWMS; i++) { |
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if (ints & (INT_PWM1 << i)) { |
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dev_vdbg(&lm->client->dev, |
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"pwm%d engine completed\n", i); |
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pwm_done(&lm->pwm[i]); |
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} |
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} |
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} |
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mutex_unlock(&lm->lock); |
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return IRQ_HANDLED; |
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} |
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/* |
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* Read the chip ID. |
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*/ |
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static int lm8323_read_id(struct lm8323_chip *lm, u8 *buf) |
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{ |
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int bytes; |
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bytes = lm8323_read(lm, LM8323_CMD_READ_ID, buf, 2); |
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if (unlikely(bytes != 2)) |
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return -EIO; |
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return 0; |
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} |
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static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd) |
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{ |
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lm8323_write(pwm->chip, 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id, |
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(cmd & 0xff00) >> 8, cmd & 0x00ff); |
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} |
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/* |
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* Write a script into a given PWM engine, concluding with PWM_END. |
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* If 'kill' is nonzero, the engine will be shut down at the end |
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* of the script, producing a zero output. Otherwise the engine |
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* will be kept running at the final PWM level indefinitely. |
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*/ |
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static void lm8323_write_pwm(struct lm8323_pwm *pwm, int kill, |
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int len, const u16 *cmds) |
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{ |
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int i; |
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for (i = 0; i < len; i++) |
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lm8323_write_pwm_one(pwm, i, cmds[i]); |
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lm8323_write_pwm_one(pwm, i++, PWM_END(kill)); |
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lm8323_write(pwm->chip, 2, LM8323_CMD_START_PWM, pwm->id); |
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pwm->running = true; |
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} |
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static void lm8323_pwm_work(struct work_struct *work) |
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{ |
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struct lm8323_pwm *pwm = work_to_pwm(work); |
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int div512, perstep, steps, hz, up, kill; |
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u16 pwm_cmds[3]; |
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int num_cmds = 0; |
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mutex_lock(&pwm->lock); |
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/* |
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* Do nothing if we're already at the requested level, |
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* or previous setting is not yet complete. In the latter |
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* case we will be called again when the previous PWM script |
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* finishes. |
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*/ |
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if (pwm->running || pwm->desired_brightness == pwm->brightness) |
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goto out; |
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kill = (pwm->desired_brightness == 0); |
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up = (pwm->desired_brightness > pwm->brightness); |
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steps = abs(pwm->desired_brightness - pwm->brightness); |
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/* |
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* Convert time (in ms) into a divisor (512 or 16 on a refclk of |
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* 32768Hz), and number of ticks per step. |
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*/ |
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if ((pwm->fade_time / steps) > (32768 / 512)) { |
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div512 = 1; |
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hz = 32768 / 512; |
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} else { |
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div512 = 0; |
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hz = 32768 / 16; |
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} |
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perstep = (hz * pwm->fade_time) / (steps * 1000); |
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if (perstep == 0) |
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perstep = 1; |
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else if (perstep > 63) |
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perstep = 63; |
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while (steps) { |
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int s; |
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s = min(126, steps); |
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pwm_cmds[num_cmds++] = PWM_RAMP(div512, perstep, s, up); |
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steps -= s; |
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} |
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lm8323_write_pwm(pwm, kill, num_cmds, pwm_cmds); |
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pwm->brightness = pwm->desired_brightness; |
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out: |
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mutex_unlock(&pwm->lock); |
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} |
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static void lm8323_pwm_set_brightness(struct led_classdev *led_cdev, |
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enum led_brightness brightness) |
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{ |
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struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev); |
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struct lm8323_chip *lm = pwm->chip; |
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mutex_lock(&pwm->lock); |
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pwm->desired_brightness = brightness; |
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mutex_unlock(&pwm->lock); |
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if (in_interrupt()) { |
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schedule_work(&pwm->work); |
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} else { |
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/* |
|
* Schedule PWM work as usual unless we are going into suspend |
|
*/ |
|
mutex_lock(&lm->lock); |
|
if (likely(!lm->pm_suspend)) |
|
schedule_work(&pwm->work); |
|
else |
|
lm8323_pwm_work(&pwm->work); |
|
mutex_unlock(&lm->lock); |
|
} |
|
} |
|
|
|
static ssize_t lm8323_pwm_show_time(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct led_classdev *led_cdev = dev_get_drvdata(dev); |
|
struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev); |
|
|
|
return sprintf(buf, "%d\n", pwm->fade_time); |
|
} |
|
|
|
static ssize_t lm8323_pwm_store_time(struct device *dev, |
|
struct device_attribute *attr, const char *buf, size_t len) |
|
{ |
|
struct led_classdev *led_cdev = dev_get_drvdata(dev); |
|
struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev); |
|
int ret, time; |
|
|
|
ret = kstrtoint(buf, 10, &time); |
|
/* Numbers only, please. */ |
|
if (ret) |
|
return ret; |
|
|
|
pwm->fade_time = time; |
|
|
|
return strlen(buf); |
|
} |
|
static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time); |
|
|
|
static struct attribute *lm8323_pwm_attrs[] = { |
|
&dev_attr_time.attr, |
|
NULL |
|
}; |
|
ATTRIBUTE_GROUPS(lm8323_pwm); |
|
|
|
static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev, |
|
const char *name) |
|
{ |
|
struct lm8323_pwm *pwm; |
|
|
|
BUG_ON(id > 3); |
|
|
|
pwm = &lm->pwm[id - 1]; |
|
|
|
pwm->id = id; |
|
pwm->fade_time = 0; |
|
pwm->brightness = 0; |
|
pwm->desired_brightness = 0; |
|
pwm->running = false; |
|
pwm->enabled = false; |
|
INIT_WORK(&pwm->work, lm8323_pwm_work); |
|
mutex_init(&pwm->lock); |
|
pwm->chip = lm; |
|
|
|
if (name) { |
|
pwm->cdev.name = name; |
|
pwm->cdev.brightness_set = lm8323_pwm_set_brightness; |
|
pwm->cdev.groups = lm8323_pwm_groups; |
|
if (led_classdev_register(dev, &pwm->cdev) < 0) { |
|
dev_err(dev, "couldn't register PWM %d\n", id); |
|
return -1; |
|
} |
|
pwm->enabled = true; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct i2c_driver lm8323_i2c_driver; |
|
|
|
static ssize_t lm8323_show_disable(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct lm8323_chip *lm = dev_get_drvdata(dev); |
|
|
|
return sprintf(buf, "%u\n", !lm->kp_enabled); |
|
} |
|
|
|
static ssize_t lm8323_set_disable(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct lm8323_chip *lm = dev_get_drvdata(dev); |
|
int ret; |
|
unsigned int i; |
|
|
|
ret = kstrtouint(buf, 10, &i); |
|
if (ret) |
|
return ret; |
|
|
|
mutex_lock(&lm->lock); |
|
lm->kp_enabled = !i; |
|
mutex_unlock(&lm->lock); |
|
|
|
return count; |
|
} |
|
static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable); |
|
|
|
static int lm8323_probe(struct i2c_client *client, |
|
const struct i2c_device_id *id) |
|
{ |
|
struct lm8323_platform_data *pdata = dev_get_platdata(&client->dev); |
|
struct input_dev *idev; |
|
struct lm8323_chip *lm; |
|
int pwm; |
|
int i, err; |
|
unsigned long tmo; |
|
u8 data[2]; |
|
|
|
if (!pdata || !pdata->size_x || !pdata->size_y) { |
|
dev_err(&client->dev, "missing platform_data\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (pdata->size_x > 8) { |
|
dev_err(&client->dev, "invalid x size %d specified\n", |
|
pdata->size_x); |
|
return -EINVAL; |
|
} |
|
|
|
if (pdata->size_y > 12) { |
|
dev_err(&client->dev, "invalid y size %d specified\n", |
|
pdata->size_y); |
|
return -EINVAL; |
|
} |
|
|
|
lm = kzalloc(sizeof *lm, GFP_KERNEL); |
|
idev = input_allocate_device(); |
|
if (!lm || !idev) { |
|
err = -ENOMEM; |
|
goto fail1; |
|
} |
|
|
|
lm->client = client; |
|
lm->idev = idev; |
|
mutex_init(&lm->lock); |
|
|
|
lm->size_x = pdata->size_x; |
|
lm->size_y = pdata->size_y; |
|
dev_vdbg(&client->dev, "Keypad size: %d x %d\n", |
|
lm->size_x, lm->size_y); |
|
|
|
lm->debounce_time = pdata->debounce_time; |
|
lm->active_time = pdata->active_time; |
|
|
|
lm8323_reset(lm); |
|
|
|
/* Nothing's set up to service the IRQ yet, so just spin for max. |
|
* 100ms until we can configure. */ |
|
tmo = jiffies + msecs_to_jiffies(100); |
|
while (lm8323_read(lm, LM8323_CMD_READ_INT, data, 1) == 1) { |
|
if (data[0] & INT_NOINIT) |
|
break; |
|
|
|
if (time_after(jiffies, tmo)) { |
|
dev_err(&client->dev, |
|
"timeout waiting for initialisation\n"); |
|
break; |
|
} |
|
|
|
msleep(1); |
|
} |
|
|
|
lm8323_configure(lm); |
|
|
|
/* If a true probe check the device */ |
|
if (lm8323_read_id(lm, data) != 0) { |
|
dev_err(&client->dev, "device not found\n"); |
|
err = -ENODEV; |
|
goto fail1; |
|
} |
|
|
|
for (pwm = 0; pwm < LM8323_NUM_PWMS; pwm++) { |
|
err = init_pwm(lm, pwm + 1, &client->dev, |
|
pdata->pwm_names[pwm]); |
|
if (err < 0) |
|
goto fail2; |
|
} |
|
|
|
lm->kp_enabled = true; |
|
err = device_create_file(&client->dev, &dev_attr_disable_kp); |
|
if (err < 0) |
|
goto fail2; |
|
|
|
idev->name = pdata->name ? : "LM8323 keypad"; |
|
snprintf(lm->phys, sizeof(lm->phys), |
|
"%s/input-kp", dev_name(&client->dev)); |
|
idev->phys = lm->phys; |
|
|
|
idev->evbit[0] = BIT(EV_KEY) | BIT(EV_MSC); |
|
__set_bit(MSC_SCAN, idev->mscbit); |
|
for (i = 0; i < LM8323_KEYMAP_SIZE; i++) { |
|
__set_bit(pdata->keymap[i], idev->keybit); |
|
lm->keymap[i] = pdata->keymap[i]; |
|
} |
|
__clear_bit(KEY_RESERVED, idev->keybit); |
|
|
|
if (pdata->repeat) |
|
__set_bit(EV_REP, idev->evbit); |
|
|
|
err = input_register_device(idev); |
|
if (err) { |
|
dev_dbg(&client->dev, "error registering input device\n"); |
|
goto fail3; |
|
} |
|
|
|
err = request_threaded_irq(client->irq, NULL, lm8323_irq, |
|
IRQF_TRIGGER_LOW|IRQF_ONESHOT, "lm8323", lm); |
|
if (err) { |
|
dev_err(&client->dev, "could not get IRQ %d\n", client->irq); |
|
goto fail4; |
|
} |
|
|
|
i2c_set_clientdata(client, lm); |
|
|
|
device_init_wakeup(&client->dev, 1); |
|
enable_irq_wake(client->irq); |
|
|
|
return 0; |
|
|
|
fail4: |
|
input_unregister_device(idev); |
|
idev = NULL; |
|
fail3: |
|
device_remove_file(&client->dev, &dev_attr_disable_kp); |
|
fail2: |
|
while (--pwm >= 0) |
|
if (lm->pwm[pwm].enabled) |
|
led_classdev_unregister(&lm->pwm[pwm].cdev); |
|
fail1: |
|
input_free_device(idev); |
|
kfree(lm); |
|
return err; |
|
} |
|
|
|
static int lm8323_remove(struct i2c_client *client) |
|
{ |
|
struct lm8323_chip *lm = i2c_get_clientdata(client); |
|
int i; |
|
|
|
disable_irq_wake(client->irq); |
|
free_irq(client->irq, lm); |
|
|
|
input_unregister_device(lm->idev); |
|
|
|
device_remove_file(&lm->client->dev, &dev_attr_disable_kp); |
|
|
|
for (i = 0; i < 3; i++) |
|
if (lm->pwm[i].enabled) |
|
led_classdev_unregister(&lm->pwm[i].cdev); |
|
|
|
kfree(lm); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
/* |
|
* We don't need to explicitly suspend the chip, as it already switches off |
|
* when there's no activity. |
|
*/ |
|
static int lm8323_suspend(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct lm8323_chip *lm = i2c_get_clientdata(client); |
|
int i; |
|
|
|
irq_set_irq_wake(client->irq, 0); |
|
disable_irq(client->irq); |
|
|
|
mutex_lock(&lm->lock); |
|
lm->pm_suspend = true; |
|
mutex_unlock(&lm->lock); |
|
|
|
for (i = 0; i < 3; i++) |
|
if (lm->pwm[i].enabled) |
|
led_classdev_suspend(&lm->pwm[i].cdev); |
|
|
|
return 0; |
|
} |
|
|
|
static int lm8323_resume(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct lm8323_chip *lm = i2c_get_clientdata(client); |
|
int i; |
|
|
|
mutex_lock(&lm->lock); |
|
lm->pm_suspend = false; |
|
mutex_unlock(&lm->lock); |
|
|
|
for (i = 0; i < 3; i++) |
|
if (lm->pwm[i].enabled) |
|
led_classdev_resume(&lm->pwm[i].cdev); |
|
|
|
enable_irq(client->irq); |
|
irq_set_irq_wake(client->irq, 1); |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
static SIMPLE_DEV_PM_OPS(lm8323_pm_ops, lm8323_suspend, lm8323_resume); |
|
|
|
static const struct i2c_device_id lm8323_id[] = { |
|
{ "lm8323", 0 }, |
|
{ } |
|
}; |
|
|
|
static struct i2c_driver lm8323_i2c_driver = { |
|
.driver = { |
|
.name = "lm8323", |
|
.pm = &lm8323_pm_ops, |
|
}, |
|
.probe = lm8323_probe, |
|
.remove = lm8323_remove, |
|
.id_table = lm8323_id, |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, lm8323_id); |
|
|
|
module_i2c_driver(lm8323_i2c_driver); |
|
|
|
MODULE_AUTHOR("Timo O. Karjalainen <[email protected]>"); |
|
MODULE_AUTHOR("Daniel Stone"); |
|
MODULE_AUTHOR("Felipe Balbi <[email protected]>"); |
|
MODULE_DESCRIPTION("LM8323 keypad driver"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
|